Asterisk.org: Developer Documentation (30 Apr 2007)

#define AST_AGENT_FD (AST_MAX_FDS-3)

used by agents for pass through

Definition at line 136 of file channel.h.

Referenced by agent_read().

#define AST_ALERT_FD (AST_MAX_FDS-1)

used for alertpipe

Definition at line 134 of file channel.h.

Referenced by restore_channel().

#define AST_BRIDGE_DTMF_CHANNEL_0 (1 << 0)

Report DTMF on channel 0.

Definition at line 1009 of file channel.h.

Referenced by ast_generic_bridge(), ast_rtp_bridge(), bridge_native_loop(), bridge_p2p_loop(), iax2_bridge(), misdn_bridge(), set_config_flags(), and zt_bridge().

#define AST_BRIDGE_DTMF_CHANNEL_1 (1 << 1)

Report DTMF on channel 1.

Definition at line 1011 of file channel.h.

Referenced by ast_generic_bridge(), ast_rtp_bridge(), bridge_native_loop(), bridge_p2p_loop(), iax2_bridge(), misdn_bridge(), set_config_flags(), and zt_bridge().

#define AST_BRIDGE_IGNORE_SIGS (1 << 4)

Ignore all signal frames except NULL.

Definition at line 1017 of file channel.h.

Referenced by bridge_native_loop(), and bridge_p2p_loop().

#define AST_BRIDGE_REC_CHANNEL_0 (1 << 2)

Return all voice frames on channel 0.

Definition at line 1013 of file channel.h.

#define AST_BRIDGE_REC_CHANNEL_1 (1 << 3)

Return all voice frames on channel 1.

Definition at line 1015 of file channel.h.

#define AST_CHANNEL_NAME 80

Max length of an ast_channel name

Definition at line 110 of file channel.h.

Referenced by ast_channel_free(), ast_parse_device_state(), create_jb(), fast_originate(), page_exec(), and softhangup_exec().

#define AST_GENERATOR_FD (AST_MAX_FDS-4)

used by generator

Definition at line 137 of file channel.h.

Referenced by __ast_read(), and ast_deactivate_generator().

#define AST_MAX_CONTEXT 80

Max length of a context

Definition at line 109 of file channel.h.

Referenced by _macro_exec(), cleanup_stale_contexts(), conf_run(), gosub_exec(), reload_config(), and try_calling().

#define AST_MAX_EXTENSION 80

Max length of an extension

Definition at line 108 of file channel.h.

Referenced by advanced_options(), ast_device_state_changed(), ast_extension_state2(), ast_hint_state_changed(), ast_ivr_menu_run_internal(), begin_dial(), conf_run(), destroy_station(), disa_exec(), do_parking_thread(), dundi_lookup_local(), forward_message(), function_enum(), get_destination(), gosub_exec(), load_config(), log_exec(), mgcp_ss(), park_add_hints(), phone_check_exception(), realtime_switch_common(), show_dialplan_helper(), skinny_ss(), speech_background(), ss_thread(), transmit_state_notify(), try_calling(), vm_authenticate(), vmauthenticate(), and wait_for_answer().

#define AST_MAX_FDS 8

Definition at line 129 of file channel.h.

Referenced by ast_channel_alloc(), ast_waitfor_nandfds(), do_parking_thread(), and update_features().

#define AST_TIMING_FD (AST_MAX_FDS-2)

used for timingfd

Definition at line 135 of file channel.h.

Referenced by __ast_read(), agent_read(), and restore_channel().

#define CHECK_BLOCKING ( c )

Definition at line 1420 of file channel.h.

Referenced by ast_sendtext(), ast_waitfor_nandfds(), ast_write(), phone_read(), and zt_read().

#define CRASH do { } while(0)

Definition at line 1417 of file channel.h.

Referenced by agent_new(), ast_hangup(), ast_queue_frame(), ast_rtcp_read(), ast_rtp_read(), ast_sched_del(), ast_udptl_read(), create_jb(), and jb_get_and_deliver().

#define DEBUGCHAN_FLAG 0x80000000

Todo:: Add explanation here

Definition at line 281 of file channel.h.

Referenced by __ast_read(), ast_write(), handle_core_set_debug_channel(), handle_debugchan_deprecated(), handle_nodebugchan_deprecated(), handle_showchan(), handle_showchan_deprecated(), and serialize_showchan().

#define FRAMECOUNT_INC ( x ) ( ((x) & DEBUGCHAN_FLAG) | (((x)+1) & ~DEBUGCHAN_FLAG) )

Definition at line 282 of file channel.h.

Referenced by __ast_read(), and ast_write().

#define LOAD_OH ( oh )

Definition at line 518 of file channel.h.

Referenced by ast_pbx_outgoing_exten().

#define MAX_LANGUAGE 20

Max length of the language setting

Definition at line 111 of file channel.h.

#define MAX_MUSICCLASS 80

Max length of the music class setting

Definition at line 112 of file channel.h.

typedef unsigned long long ast_group_t

Definition at line 146 of file channel.h.

anonymous enum

ast_channel_tech Properties

Enumerator:

AST_CHAN_TP_WANTSJITTER	Channels have this property if they can accept input with jitter; i.e. most VoIP channels.
AST_CHAN_TP_CREATESJITTER	Channels have this property if they can create jitter; i.e. most VoIP channels.

Definition at line 445 of file channel.h.

00445      {
00446    /*! \brief Channels have this property if they can accept input with jitter; 
00447     *         i.e. most VoIP channels */
00448    AST_CHAN_TP_WANTSJITTER = (1 << 0),
00449    /*! \brief Channels have this property if they can create jitter; 
00450     *         i.e. most VoIP channels */
00451    AST_CHAN_TP_CREATESJITTER = (1 << 1),
00452 };

anonymous enum

ast_channel flags

Enumerator:

AST_FLAG_DEFER_DTMF	Queue incoming dtmf, to be released when this flag is turned off
AST_FLAG_WRITE_INT	write should be interrupt generator
AST_FLAG_BLOCKING	a thread is blocking on this channel
AST_FLAG_ZOMBIE	This is a zombie channel
AST_FLAG_EXCEPTION	There is an exception pending
AST_FLAG_MOH	Listening to moh XXX anthm promises me this will disappear XXX
AST_FLAG_SPYING	This channel is spying on another channel
AST_FLAG_NBRIDGE	This channel is in a native bridge
AST_FLAG_IN_AUTOLOOP	the channel is in an auto-incrementing dialplan processor, so when ->priority is set, it will get incremented before finding the next priority to run
AST_FLAG_OUTGOING	This is an outgoing call
AST_FLAG_WHISPER	This channel is being whispered on
AST_FLAG_IN_DTMF	A DTMF_BEGIN frame has been read from this channel, but not yet an END
AST_FLAG_EMULATE_DTMF	A DTMF_END was received when not IN_DTMF, so the length of the digit is currently being emulated
AST_FLAG_END_DTMF_ONLY	This is set to tell the channel not to generate DTMF begin frames, and to instead only generate END frames.

Definition at line 455 of file channel.h.

00455      {
00456    /*! Queue incoming dtmf, to be released when this flag is turned off */
00457    AST_FLAG_DEFER_DTMF =    (1 << 1),
00458    /*! write should be interrupt generator */
00459    AST_FLAG_WRITE_INT =     (1 << 2),
00460    /*! a thread is blocking on this channel */
00461    AST_FLAG_BLOCKING =      (1 << 3),
00462    /*! This is a zombie channel */
00463    AST_FLAG_ZOMBIE =        (1 << 4),
00464    /*! There is an exception pending */
00465    AST_FLAG_EXCEPTION =     (1 << 5),
00466    /*! Listening to moh XXX anthm promises me this will disappear XXX */
00467    AST_FLAG_MOH =           (1 << 6),
00468    /*! This channel is spying on another channel */
00469    AST_FLAG_SPYING =        (1 << 7),
00470    /*! This channel is in a native bridge */
00471    AST_FLAG_NBRIDGE =       (1 << 8),
00472    /*! the channel is in an auto-incrementing dialplan processor,
00473     *  so when ->priority is set, it will get incremented before
00474     *  finding the next priority to run */
00475    AST_FLAG_IN_AUTOLOOP =   (1 << 9),
00476    /*! This is an outgoing call */
00477    AST_FLAG_OUTGOING =      (1 << 10),
00478    /*! This channel is being whispered on */
00479    AST_FLAG_WHISPER =       (1 << 11),
00480    /*! A DTMF_BEGIN frame has been read from this channel, but not yet an END */
00481    AST_FLAG_IN_DTMF =       (1 << 12),
00482    /*! A DTMF_END was received when not IN_DTMF, so the length of the digit is 
00483     *  currently being emulated */
00484    AST_FLAG_EMULATE_DTMF =  (1 << 13),
00485    /*! This is set to tell the channel not to generate DTMF begin frames, and
00486     *  to instead only generate END frames. */
00487    AST_FLAG_END_DTMF_ONLY = (1 << 14),
00488 };

anonymous enum

ast_bridge_config flags

Enumerator:

AST_FEATURE_PLAY_WARNING
AST_FEATURE_REDIRECT
AST_FEATURE_DISCONNECT
AST_FEATURE_ATXFER
AST_FEATURE_AUTOMON
AST_FEATURE_PARKCALL

Definition at line 491 of file channel.h.

00491      {
00492    AST_FEATURE_PLAY_WARNING = (1 << 0),
00493    AST_FEATURE_REDIRECT =     (1 << 1),
00494    AST_FEATURE_DISCONNECT =   (1 << 2),
00495    AST_FEATURE_ATXFER =       (1 << 3),
00496    AST_FEATURE_AUTOMON =      (1 << 4),
00497    AST_FEATURE_PARKCALL =     (1 << 5),
00498 };

anonymous enum

Enumerator:

AST_CDR_TRANSFER
AST_CDR_FORWARD
AST_CDR_CALLWAIT
AST_CDR_CONFERENCE

Definition at line 540 of file channel.h.

00540      {
00541    AST_CDR_TRANSFER =   (1 << 0),
00542    AST_CDR_FORWARD =    (1 << 1),
00543    AST_CDR_CALLWAIT =   (1 << 2),
00544    AST_CDR_CONFERENCE = (1 << 3),
00545 };

anonymous enum

Enumerator:

AST_SOFTHANGUP_DEV	Soft hangup by device
AST_SOFTHANGUP_ASYNCGOTO	Soft hangup for async goto
AST_SOFTHANGUP_SHUTDOWN
AST_SOFTHANGUP_TIMEOUT
AST_SOFTHANGUP_APPUNLOAD
AST_SOFTHANGUP_EXPLICIT
AST_SOFTHANGUP_UNBRIDGE

Definition at line 547 of file channel.h.

00547      {
00548    /*! Soft hangup by device */
00549    AST_SOFTHANGUP_DEV =       (1 << 0),
00550    /*! Soft hangup for async goto */
00551    AST_SOFTHANGUP_ASYNCGOTO = (1 << 1),
00552    AST_SOFTHANGUP_SHUTDOWN =  (1 << 2),
00553    AST_SOFTHANGUP_TIMEOUT =   (1 << 3),
00554    AST_SOFTHANGUP_APPUNLOAD = (1 << 4),
00555    AST_SOFTHANGUP_EXPLICIT =  (1 << 5),
00556    AST_SOFTHANGUP_UNBRIDGE =  (1 << 6),
00557 };

enum ast_bridge_result

Enumerator:

AST_BRIDGE_COMPLETE
AST_BRIDGE_FAILED
AST_BRIDGE_FAILED_NOWARN
AST_BRIDGE_RETRY

Definition at line 139 of file channel.h.

00139                        {
00140    AST_BRIDGE_COMPLETE = 0,
00141    AST_BRIDGE_FAILED = -1,
00142    AST_BRIDGE_FAILED_NOWARN = -2,
00143    AST_BRIDGE_RETRY = -3,
00144 };

enum ast_channel_adsicpe

Enumerator:

AST_ADSI_UNKNOWN
AST_ADSI_AVAILABLE
AST_ADSI_UNAVAILABLE
AST_ADSI_OFFHOOKONLY

Definition at line 284 of file channel.h.

00284                          {
00285    AST_ADSI_UNKNOWN,
00286    AST_ADSI_AVAILABLE,
00287    AST_ADSI_UNAVAILABLE,
00288    AST_ADSI_OFFHOOKONLY,
00289 };

enum ast_channel_state

ast_channel states

Note:: Bits 0-15 of state are reserved for the state (up/down) of the line Bits 16-32 of state are reserved for flags

Enumerator:

AST_STATE_DOWN	Channel is down and available
AST_STATE_RESERVED	Channel is down, but reserved
AST_STATE_OFFHOOK	Channel is off hook
AST_STATE_DIALING	Digits (or equivalent) have been dialed
AST_STATE_RING	Line is ringing
AST_STATE_RINGING	Remote end is ringing
AST_STATE_UP	Line is up
AST_STATE_BUSY	Line is busy
AST_STATE_DIALING_OFFHOOK	Digits (or equivalent) have been dialed while offhook
AST_STATE_PRERING	Channel has detected an incoming call and is waiting for ring
AST_STATE_MUTE	Do not transmit voice data

Definition at line 297 of file channel.h.

00297                        {
00298    /*! Channel is down and available */
00299    AST_STATE_DOWN,
00300    /*! Channel is down, but reserved */
00301    AST_STATE_RESERVED,
00302    /*! Channel is off hook */
00303    AST_STATE_OFFHOOK,
00304    /*! Digits (or equivalent) have been dialed */
00305    AST_STATE_DIALING,
00306    /*! Line is ringing */
00307    AST_STATE_RING,
00308    /*! Remote end is ringing */
00309    AST_STATE_RINGING,
00310    /*! Line is up */
00311    AST_STATE_UP,
00312    /*! Line is busy */
00313    AST_STATE_BUSY,
00314    /*! Digits (or equivalent) have been dialed while offhook */
00315    AST_STATE_DIALING_OFFHOOK,
00316    /*! Channel has detected an incoming call and is waiting for ring */
00317    AST_STATE_PRERING,
00318 
00319    /*! Do not transmit voice data */
00320    AST_STATE_MUTE = (1 << 16),
00321 };

enum channelreloadreason

Channel reload reasons for manager events at load or reload of configuration.

Enumerator:

CHANNEL_MODULE_LOAD
CHANNEL_MODULE_RELOAD
CHANNEL_CLI_RELOAD
CHANNEL_MANAGER_RELOAD

Definition at line 561 of file channel.h.

00561                          {
00562    CHANNEL_MODULE_LOAD,
00563    CHANNEL_MODULE_RELOAD,
00564    CHANNEL_CLI_RELOAD,
00565    CHANNEL_MANAGER_RELOAD,
00566 };

struct ast_channel* __ast_request_and_dial	(	const char *	type,
		int	format,
		void *	data,
		int	timeout,
		int *	reason,
		const char *	cidnum,
		const char *	cidname,
		struct outgoing_helper *	oh
	)

Definition at line 2927 of file channel.c.

References ast_channel::_state, outgoing_helper::account, ast_call(), AST_CAUSE_BUSY, AST_CAUSE_CONGESTION, ast_cdr_alloc(), ast_cdr_disposition(), ast_cdr_end(), ast_cdr_failed(), ast_cdr_init(), ast_cdr_setaccount(), ast_cdr_setapp(), ast_cdr_start(), ast_cdr_update(), ast_channel_inherit_variables(), AST_CONTROL_ANSWER, AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_HANGUP, AST_CONTROL_HOLD, AST_CONTROL_PROCEEDING, AST_CONTROL_PROGRESS, AST_CONTROL_RINGING, AST_CONTROL_UNHOLD, AST_CONTROL_VIDUPDATE, AST_FRAME_CONTROL, ast_frfree(), ast_hangup(), ast_log(), ast_read(), ast_request(), ast_set_callerid(), ast_set_variables(), AST_STATE_UP, ast_strlen_zero(), ast_waitfor(), ast_channel::cdr, outgoing_helper::cid_name, outgoing_helper::cid_num, ast_channel::context, outgoing_helper::context, ast_channel::exten, outgoing_helper::exten, f, ast_channel::hangupcause, LOG_NOTICE, outgoing_helper::parent_channel, ast_channel::priority, outgoing_helper::priority, and outgoing_helper::vars.

Referenced by ast_pbx_outgoing_app(), ast_pbx_outgoing_exten(), ast_request_and_dial(), and parkandannounce_exec().

02928 {
02929    int dummy_outstate;
02930    int cause = 0;
02931    struct ast_channel *chan;
02932    int res = 0;
02933    
02934    if (outstate)
02935       *outstate = 0;
02936    else
02937       outstate = &dummy_outstate;   /* make outstate always a valid pointer */
02938 
02939    chan = ast_request(type, format, data, &cause);
02940    if (!chan) {
02941       ast_log(LOG_NOTICE, "Unable to request channel %s/%s\n", type, (char *)data);
02942       /* compute error and return */
02943       if (cause == AST_CAUSE_BUSY)
02944          *outstate = AST_CONTROL_BUSY;
02945       else if (cause == AST_CAUSE_CONGESTION)
02946          *outstate = AST_CONTROL_CONGESTION;
02947       return NULL;
02948    }
02949 
02950    if (oh) {
02951       if (oh->vars)  
02952          ast_set_variables(chan, oh->vars);
02953       /* XXX why is this necessary, for the parent_channel perhaps ? */
02954       if (!ast_strlen_zero(oh->cid_num) && !ast_strlen_zero(oh->cid_name))
02955          ast_set_callerid(chan, oh->cid_num, oh->cid_name, oh->cid_num);
02956       if (oh->parent_channel)
02957          ast_channel_inherit_variables(oh->parent_channel, chan);
02958       if (oh->account)
02959          ast_cdr_setaccount(chan, oh->account); 
02960    }
02961    ast_set_callerid(chan, cid_num, cid_name, cid_num);
02962 
02963    
02964 
02965    if (!chan->cdr) { /* up till now, this insertion hasn't been done. Therefore,
02966             to keep from throwing off the basic order of the universe,
02967             we will try to keep this cdr from getting posted. */
02968       chan->cdr = ast_cdr_alloc();
02969       ast_cdr_init(chan->cdr, chan);
02970       ast_cdr_start(chan->cdr);
02971    }
02972    if (ast_call(chan, data, 0)) {   /* ast_call failed... */
02973       ast_log(LOG_NOTICE, "Unable to call channel %s/%s\n", type, (char *)data);
02974    } else {
02975       res = 1; /* mark success in case chan->_state is already AST_STATE_UP */
02976       while (timeout && chan->_state != AST_STATE_UP) {
02977          struct ast_frame *f;
02978          res = ast_waitfor(chan, timeout);
02979          if (res <= 0) /* error, timeout, or done */
02980             break;
02981          if (timeout > -1)
02982             timeout = res;
02983          f = ast_read(chan);
02984          if (!f) {
02985             *outstate = AST_CONTROL_HANGUP;
02986             res = 0;
02987             break;
02988          }
02989          if (f->frametype == AST_FRAME_CONTROL) {
02990             switch (f->subclass) {
02991             case AST_CONTROL_RINGING:  /* record but keep going */
02992                *outstate = f->subclass;
02993                break;
02994 
02995             case AST_CONTROL_BUSY:
02996             case AST_CONTROL_CONGESTION:
02997             case AST_CONTROL_ANSWER:
02998                *outstate = f->subclass;
02999                timeout = 0;      /* trick to force exit from the while() */
03000                break;
03001 
03002             /* Ignore these */
03003             case AST_CONTROL_PROGRESS:
03004             case AST_CONTROL_PROCEEDING:
03005             case AST_CONTROL_HOLD:
03006             case AST_CONTROL_UNHOLD:
03007             case AST_CONTROL_VIDUPDATE:
03008             case -1:       /* Ignore -- just stopping indications */
03009                break;
03010 
03011             default:
03012                ast_log(LOG_NOTICE, "Don't know what to do with control frame %d\n", f->subclass);
03013             }
03014          }
03015          ast_frfree(f);
03016       }
03017    }
03018 
03019    /* Final fixups */
03020    if (oh) {
03021       if (!ast_strlen_zero(oh->context))
03022          ast_copy_string(chan->context, oh->context, sizeof(chan->context));
03023       if (!ast_strlen_zero(oh->exten))
03024          ast_copy_string(chan->exten, oh->exten, sizeof(chan->exten));
03025       if (oh->priority) 
03026          chan->priority = oh->priority;
03027    }
03028    if (chan->_state == AST_STATE_UP)
03029       *outstate = AST_CONTROL_ANSWER;
03030 
03031    if (res <= 0) {
03032       if (!chan->cdr && (chan->cdr = ast_cdr_alloc()))
03033          ast_cdr_init(chan->cdr, chan);
03034       if (chan->cdr) {
03035          char tmp[256];
03036          snprintf(tmp, sizeof(tmp), "%s/%s", type, (char *)data);
03037          ast_cdr_setapp(chan->cdr,"Dial",tmp);
03038          ast_cdr_update(chan);
03039          ast_cdr_start(chan->cdr);
03040          ast_cdr_end(chan->cdr);
03041          /* If the cause wasn't handled properly */
03042          if (ast_cdr_disposition(chan->cdr,chan->hangupcause))
03043             ast_cdr_failed(chan->cdr);
03044       }
03045       ast_hangup(chan);
03046       chan = NULL;
03047    }
03048    return chan;
03049 }

int ast_activate_generator	(	struct ast_channel *	chan,
		struct ast_generator *	gen,
		void *	params
	)

Activate a given generator

Definition at line 1814 of file channel.c.

References ast_generator::alloc, ast_channel_lock, ast_channel_unlock, ast_prod(), ast_settimeout(), gen, ast_channel::generator, generator_force(), ast_channel::generatordata, and ast_generator::release.

Referenced by app_exec(), ast_channel_start_silence_generator(), ast_linear_stream(), ast_playtones_start(), ast_tonepair_start(), channel_spy(), local_ast_moh_start(), and milliwatt_exec().

01815 {
01816    int res = 0;
01817 
01818    ast_channel_lock(chan);
01819 
01820    if (chan->generatordata) {
01821       if (chan->generator && chan->generator->release)
01822          chan->generator->release(chan, chan->generatordata);
01823       chan->generatordata = NULL;
01824    }
01825 
01826    ast_prod(chan);
01827    if (gen->alloc && !(chan->generatordata = gen->alloc(chan, params))) {
01828       res = -1;
01829    }
01830    
01831    if (!res) {
01832       ast_settimeout(chan, 160, generator_force, chan);
01833       chan->generator = gen;
01834    }
01835 
01836    ast_channel_unlock(chan);
01837 
01838    return res;
01839 }

int ast_active_channels ( void )

returns number of active/allocated channels

Returns number of active/allocated channels

Definition at line 454 of file channel.c.

References AST_LIST_LOCK, AST_LIST_TRAVERSE, and AST_LIST_UNLOCK.

Referenced by quit_handler().

00455 {
00456    struct ast_channel *c;
00457    int cnt = 0;
00458    AST_LIST_LOCK(&channels);
00459    AST_LIST_TRAVERSE(&channels, c, chan_list)
00460       cnt++;
00461    AST_LIST_UNLOCK(&channels);
00462    return cnt;
00463 }

static int ast_add_fd	(	struct pollfd *	pfd,
		int	fd
	)			`[inline, static]`

if fd is a valid descriptor, set *pfd with the descriptor

Returns:: Return 1 (not -1!) if added, 0 otherwise (so we can add the return value to the index into the array)

Definition at line 1339 of file channel.h.

References pollfd::events, pollfd::fd, POLLIN, and POLLPRI.

Referenced by ast_waitfor_nandfds().

01340 {
01341    pfd->fd = fd;
01342    pfd->events = POLLIN | POLLPRI;
01343    return fd >= 0;
01344 }

int ast_answer ( struct ast_channel * chan )

Answer a ringing call.

Parameters:

chan

channel to answer This function answers a channel and handles all necessary call setup functions.

Returns:: Returns 0 on success, -1 on failure

Definition at line 1747 of file channel.c.

References ast_channel::_state, ast_channel_tech::answer, ast_cdr_answer(), ast_channel_lock, ast_channel_unlock, ast_check_hangup(), AST_FLAG_OUTGOING, AST_FLAG_ZOMBIE, ast_setstate(), AST_STATE_RING, AST_STATE_RINGING, AST_STATE_UP, ast_test_flag, ast_channel::cdr, and ast_channel::tech.

Referenced by __login_exec(), agi_exec_full(), alarmreceiver_exec(), app_exec(), ast_bridge_call(), ast_control_streamfile(), ast_pickup_call(), auth_exec(), background_detect_exec(), builtin_parkcall(), common_exec(), conf_exec(), count_exec(), dictate_exec(), directory_exec(), disa_exec(), features_answer(), handle_answer(), ices_exec(), milliwatt_exec(), mwanalyze_exec(), nv_background_detect_exec(), nv_detectfax_exec(), park_call_exec(), park_exec(), pbx_builtin_answer(), pbx_builtin_background(), pickup_do(), playback_exec(), privacy_exec(), read_exec(), rpt_exec(), run_station(), rxfax_exec(), sayunixtime_exec(), send_waveform_to_channel(), skel_exec(), sla_handle_dial_state_event(), sla_station_exec(), speech_background(), testclient_exec(), testserver_exec(), txfax_exec(), vm_exec(), vm_execmain(), waitforsilence_exec(), zapateller_exec(), and zapras_exec().

01748 {
01749    int res = 0;
01750    ast_channel_lock(chan);
01751    /* You can't answer an outbound call */
01752    if (ast_test_flag(chan, AST_FLAG_OUTGOING)) {
01753       ast_channel_unlock(chan);
01754       return 0;
01755    }
01756    /* Stop if we're a zombie or need a soft hangup */
01757    if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
01758       ast_channel_unlock(chan);
01759       return -1;
01760    }
01761    switch(chan->_state) {
01762    case AST_STATE_RINGING:
01763    case AST_STATE_RING:
01764       if (chan->tech->answer)
01765          res = chan->tech->answer(chan);
01766       ast_setstate(chan, AST_STATE_UP);
01767       ast_cdr_answer(chan->cdr);
01768       break;
01769    case AST_STATE_UP:
01770       ast_cdr_answer(chan->cdr);
01771       break;
01772    default:
01773       break;
01774    }
01775    ast_channel_unlock(chan);
01776    return res;
01777 }

int ast_autoservice_start ( struct ast_channel * chan )

Automatically service a channel for us...

Return values:

	0	success
	-1	failure, or the channel is already being autoserviced

Definition at line 96 of file autoservice.c.

References ast_calloc, AST_LIST_INSERT_HEAD, AST_LIST_LOCK, AST_LIST_REMOVE, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_pthread_create_background, AST_PTHREADT_NULL, asthread, autoservice_run(), asent::chan, free, and LOG_WARNING.

Referenced by _macro_exec(), ast_dtmf_stream(), ast_get_enum(), ast_get_srv(), ast_get_txt(), bridge_playfile(), builtin_atxfer(), builtin_automonitor(), builtin_blindtransfer(), conf_play(), feature_exec_app(), osplookup_exec(), sla_station_exec(), and try_calling().

00097 {
00098    int res = -1;
00099    struct asent *as;
00100    AST_LIST_LOCK(&aslist);
00101 
00102    /* Check if the channel already has autoservice */
00103    AST_LIST_TRAVERSE(&aslist, as, list) {
00104       if (as->chan == chan)
00105          break;
00106    }
00107 
00108    /* If not, start autoservice on channel */
00109    if (!as && (as = ast_calloc(1, sizeof(*as)))) {
00110       as->chan = chan;
00111       AST_LIST_INSERT_HEAD(&aslist, as, list);
00112       res = 0;
00113       if (asthread == AST_PTHREADT_NULL) { /* need start the thread */
00114          if (ast_pthread_create_background(&asthread, NULL, autoservice_run, NULL)) {
00115             ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
00116             /* There will only be a single member in the list at this point,
00117                the one we just added. */
00118             AST_LIST_REMOVE(&aslist, as, list);
00119             free(as);
00120             res = -1;
00121          } else
00122             pthread_kill(asthread, SIGURG);
00123       }
00124    }
00125    AST_LIST_UNLOCK(&aslist);
00126    return res;
00127 }

int ast_autoservice_stop ( struct ast_channel * chan )

Stop servicing a channel for us...

Return values:

	0	success
	-1	error, or the channel has been hungup

Definition at line 129 of file autoservice.c.

References ast_channel::_softhangup, AST_FLAG_BLOCKING, AST_LIST_LOCK, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, AST_LIST_UNLOCK, AST_PTHREADT_NULL, ast_test_flag, asthread, asent::chan, and free.

Referenced by _macro_exec(), ast_dtmf_stream(), ast_get_srv(), ast_get_txt(), bridge_playfile(), builtin_atxfer(), builtin_automonitor(), conf_play(), feature_exec_app(), finishup(), osplookup_exec(), sla_station_exec(), and try_calling().

00130 {
00131    int res = -1;
00132    struct asent *as;
00133 
00134    AST_LIST_LOCK(&aslist);
00135    AST_LIST_TRAVERSE_SAFE_BEGIN(&aslist, as, list) {  
00136       if (as->chan == chan) {
00137          AST_LIST_REMOVE_CURRENT(&aslist, list);
00138          free(as);
00139          if (!chan->_softhangup)
00140             res = 0;
00141          break;
00142       }
00143    }
00144    AST_LIST_TRAVERSE_SAFE_END
00145 
00146    if (asthread != AST_PTHREADT_NULL) 
00147       pthread_kill(asthread, SIGURG);
00148    AST_LIST_UNLOCK(&aslist);
00149 
00150    /* Wait for it to un-block */
00151    while(ast_test_flag(chan, AST_FLAG_BLOCKING))
00152       usleep(1000);
00153    return res;
00154 }

void ast_begin_shutdown ( int hangup )

Initiate system shutdown.

Initiate system shutdown -- prevents new channels from being allocated. If "hangup" is non-zero, all existing channels will receive soft hangups

Definition at line 441 of file channel.c.

References AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_softhangup(), AST_SOFTHANGUP_SHUTDOWN, and shutting_down.

Referenced by quit_handler().

00442 {
00443    struct ast_channel *c;
00444    shutting_down = 1;
00445    if (hangup) {
00446       AST_LIST_LOCK(&channels);
00447       AST_LIST_TRAVERSE(&channels, c, chan_list)
00448          ast_softhangup(c, AST_SOFTHANGUP_SHUTDOWN);
00449       AST_LIST_UNLOCK(&channels);
00450    }
00451 }

int ast_best_codec ( int fmts )

Pick the best audio codec.

Pick the best codec

G.722 is better then all codecs in this list

alaw used by all telephone equipment at Russia

Okay, well, signed linear is easy to translate into other stuff! slinear<->alaw recoding very fast

ulaw standart for USA and Japan

Speex is free, but computationally more expensive than GSM

G.726 is standard ADPCM, in RFC3551 packing order

G.726 is standard ADPCM, in AAL2 packing order

ADPCM has great sound quality and is still pretty easy to translate

Okay, we're down to vocoders now, so pick GSM because it's small and easier to translate and sounds pretty good

iLBC is not too bad

G.729a is faster than 723 and slightly less expensive

Down to G.723.1 which is proprietary but at least designed for voice

Ick, LPC10 sounds terrible, but at least we have code for it, if you're tacky enough to use it

Definition at line 666 of file channel.c.

References AST_FORMAT_ADPCM, AST_FORMAT_ALAW, AST_FORMAT_AUDIO_MASK, AST_FORMAT_G722, AST_FORMAT_G723_1, AST_FORMAT_G726, AST_FORMAT_G726_AAL2, AST_FORMAT_G729A, AST_FORMAT_GSM, AST_FORMAT_ILBC, AST_FORMAT_LPC10, AST_FORMAT_SLINEAR, AST_FORMAT_SPEEX, AST_FORMAT_ULAW, ast_log(), LOG_WARNING, and prefs.

Referenced by __login_exec(), __oh323_new(), agent_call(), ast_channel_best_codec(), ast_codec_choose(), ast_iax2_new(), builtin_atxfer(), echo_exec(), findmeexec(), gtalk_new(), handle_open_receive_channel_ack_message(), iax2_request(), local_new(), mgcp_new(), sip_new(), skinny_new(), socket_process(), and transmit_connect().

00667 {
00668    /* This just our opinion, expressed in code.  We are asked to choose
00669       the best codec to use, given no information */
00670    int x;
00671    static int prefs[] =
00672    {
00673       /*! G.722 is better then all codecs in this list */
00674       AST_FORMAT_G722,
00675       /*! alaw used by all telephone equipment at Russia */
00676       AST_FORMAT_ALAW,
00677       /*! Okay, well, signed linear is easy to translate into other stuff! slinear<->alaw recoding very fast */
00678       AST_FORMAT_SLINEAR,
00679       /*! ulaw standart for USA and Japan */
00680       AST_FORMAT_ULAW,
00681       /*! Speex is free, but computationally more expensive than GSM */
00682       AST_FORMAT_SPEEX,
00683       /*! G.726 is standard ADPCM, in RFC3551 packing order */
00684       AST_FORMAT_G726,
00685       /*! G.726 is standard ADPCM, in AAL2 packing order */
00686       AST_FORMAT_G726_AAL2,
00687       /*! ADPCM has great sound quality and is still pretty easy to translate */
00688       AST_FORMAT_ADPCM,
00689       /*! Okay, we're down to vocoders now, so pick GSM because it's small and easier to
00690           translate and sounds pretty good */
00691       AST_FORMAT_GSM,
00692       /*! iLBC is not too bad */
00693       AST_FORMAT_ILBC,
00694       /*! G.729a is faster than 723 and slightly less expensive */
00695       AST_FORMAT_G729A,
00696       /*! Down to G.723.1 which is proprietary but at least designed for voice */
00697       AST_FORMAT_G723_1,
00698       /*! Ick, LPC10 sounds terrible, but at least we have code for it, if you're tacky enough
00699           to use it */
00700       AST_FORMAT_LPC10,
00701    };
00702 
00703    /* Strip out video */
00704    fmts &= AST_FORMAT_AUDIO_MASK;
00705    
00706    /* Find the first preferred codec in the format given */
00707    for (x=0; x < (sizeof(prefs) / sizeof(prefs[0]) ); x++)
00708       if (fmts & prefs[x])
00709          return prefs[x];
00710    ast_log(LOG_WARNING, "Don't know any of 0x%x formats\n", fmts);
00711    return 0;
00712 }

struct ast_channel* ast_bridged_channel ( struct ast_channel * chan )

Find bridged channel.

Parameters:

chan

Current channel

Definition at line 3748 of file channel.c.

References ast_channel::_bridge, ast_channel_tech::bridged_channel, and ast_channel::tech.

Referenced by __zt_exception(), agents_show(), agents_show_online(), ast_channel_masquerade(), attempt_transfer(), check_bridge(), common_exec(), console_transfer(), console_transfer_deprecated(), create_jb(), export_aoc_vars(), handle_chanlist(), handle_chanlist_deprecated(), handle_hd_hf(), handle_invite_replaces(), handle_request(), handle_request_bye(), handle_request_info(), handle_request_invite(), handle_request_refer(), handle_response_invite(), handle_showchan(), handle_showchan_deprecated(), local_attended_transfer(), mgcp_hangup(), mgcp_ss(), misdn_transfer_bc(), mixmonitor_thread(), schedule_delivery(), sip_read(), socket_process(), ss_thread(), start_spying(), startmon(), zt_handle_event(), and zt_hangup().

03749 {
03750    struct ast_channel *bridged;
03751    bridged = chan->_bridge;
03752    if (bridged && bridged->tech->bridged_channel)
03753       bridged = bridged->tech->bridged_channel(chan, bridged);
03754    return bridged;
03755 }

int ast_call	(	struct ast_channel *	chan,
		char *	addr,
		int	timeout
	)

Make a call.

Parameters:

	chan	which channel to make the call on
	addr	destination of the call
	timeout	time to wait on for connect Place a call, take no longer than timeout ms.

Returns:: Returns -1 on failure, 0 on not enough time (does not automatically stop ringing), and the number of seconds the connect took otherwise.

Definition at line 3105 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_check_hangup(), AST_FLAG_OUTGOING, AST_FLAG_ZOMBIE, ast_set_flag, ast_test_flag, ast_channel_tech::call, and ast_channel::tech.

Referenced by __ast_request_and_dial(), agent_call(), ast_feature_request_and_dial(), attempt_reconnect(), begin_dial(), features_call(), findmeexec(), function_ilink(), ring_entry(), rpt(), rpt_exec(), and wait_for_answer().

03106 {
03107    /* Place an outgoing call, but don't wait any longer than timeout ms before returning.
03108       If the remote end does not answer within the timeout, then do NOT hang up, but
03109       return anyway.  */
03110    int res = -1;
03111    /* Stop if we're a zombie or need a soft hangup */
03112    ast_channel_lock(chan);
03113    if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan)) {
03114       if (chan->tech->call)
03115          res = chan->tech->call(chan, addr, timeout);
03116       ast_set_flag(chan, AST_FLAG_OUTGOING);
03117    }
03118    ast_channel_unlock(chan);
03119    return res;
03120 }

void ast_cancel_shutdown ( void )

Cancel a shutdown in progress.

Cancels an existing shutdown and returns to normal operation

Definition at line 466 of file channel.c.

References shutting_down.

Referenced by handle_abort_halt().

00467 {
00468    shutting_down = 0;
00469 }

const char* ast_cause2str ( int state )

Gives the string form of a given hangup cause.

Parameters:

state

cause to get the description of Give a name to a cause code Returns the text form of the binary cause code given

Definition at line 586 of file channel.c.

References causes, and desc.

Referenced by __transmit_response(), ast_hangup(), findmeexec(), and transmit_request_with_auth().

00587 {
00588    int x;
00589 
00590    for (x=0; x < sizeof(causes) / sizeof(causes[0]); x++) {
00591       if (causes[x].cause == cause)
00592          return causes[x].desc;
00593    }
00594 
00595    return "Unknown";
00596 }

void ast_change_name	(	struct ast_channel *	chan,
		char *	newname
	)

Change channel name.

Definition at line 3332 of file channel.c.

References ast_string_field_set, EVENT_FLAG_CALL, manager_event(), and name.

03333 {
03334    manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", chan->name, newname, chan->uniqueid);
03335    ast_string_field_set(chan, name, newname);
03336 }

struct ast_channel* ast_channel_alloc	(	int	needqueue,
		int	state,
		const char *	cid_num,
		const char *	cid_name,
		const char *	acctcode,
		const char *	exten,
		const char *	context,
		const int	amaflag,
		const char *	name_fmt,
			...
	)

Create a channel structure.

Returns:: Returns NULL on failure to allocate.

Note:: New channels are by default set to the "default" context and extension "s"

Definition at line 720 of file channel.c.

References ast_calloc, ast_log(), AST_MAX_FDS, ast_string_field_init, free, HAVE_ZAPTEL, LOG_WARNING, sched_context_create(), and shutting_down.

Referenced by __oh323_new(), agent_new(), alsa_new(), ast_async_goto(), ast_iax2_new(), ast_masq_park_call(), ast_pbx_outgoing_cdr_failed(), ast_pbx_outgoing_exten(), builtin_atxfer(), check_goto_on_transfer(), features_new(), gtalk_new(), iax_park(), local_new(), make_email_file(), mgcp_new(), misdn_new(), nbs_new(), oss_new(), pbx_substitute_variables_helper_full(), phone_new(), sendpage(), sip_new(), sip_park(), skinny_new(), and zt_new().

00721 {
00722    struct ast_channel *tmp;
00723    int x;
00724    int flags;
00725    struct varshead *headp;
00726    va_list ap1, ap2;
00727 
00728    /* If shutting down, don't allocate any new channels */
00729    if (shutting_down) {
00730       ast_log(LOG_WARNING, "Channel allocation failed: Refusing due to active shutdown\n");
00731       return NULL;
00732    }
00733 
00734    if (!(tmp = ast_calloc(1, sizeof(*tmp))))
00735       return NULL;
00736 
00737    if (!(tmp->sched = sched_context_create())) {
00738       ast_log(LOG_WARNING, "Channel allocation failed: Unable to create schedule context\n");
00739       free(tmp);
00740       return NULL;
00741    }
00742    
00743    ast_string_field_init(tmp, 128);
00744 
00745    /* Don't bother initializing the last two FD here, because they
00746       will *always* be set just a few lines down (AST_TIMING_FD,
00747       AST_ALERT_FD). */
00748    for (x = 0; x < AST_MAX_FDS - 2; x++)
00749       tmp->fds[x] = -1;
00750 
00751 #ifdef HAVE_ZAPTEL
00752    tmp->timingfd = open("/dev/zap/timer", O_RDWR);
00753    if (tmp->timingfd > -1) {
00754       /* Check if timing interface supports new
00755          ping/pong scheme */
00756       flags = 1;
00757       if (!ioctl(tmp->timingfd, ZT_TIMERPONG, &flags))
00758          needqueue = 0;
00759    }
00760 #else
00761    tmp->timingfd = -1;              
00762 #endif               
00763 
00764    if (needqueue) {
00765       if (pipe(tmp->alertpipe)) {
00766          ast_log(LOG_WARNING, "Channel allocation failed: Can't create alert pipe!\n");
00767          ast_string_field_free_pools(tmp);
00768          free(tmp);
00769          return NULL;
00770       } else {
00771          flags = fcntl(tmp->alertpipe[0], F_GETFL);
00772          fcntl(tmp->alertpipe[0], F_SETFL, flags | O_NONBLOCK);
00773          flags = fcntl(tmp->alertpipe[1], F_GETFL);
00774          fcntl(tmp->alertpipe[1], F_SETFL, flags | O_NONBLOCK);
00775       }
00776    } else   /* Make sure we've got it done right if they don't */
00777       tmp->alertpipe[0] = tmp->alertpipe[1] = -1;
00778 
00779    /* Always watch the alertpipe */
00780    tmp->fds[AST_ALERT_FD] = tmp->alertpipe[0];
00781    /* And timing pipe */
00782    tmp->fds[AST_TIMING_FD] = tmp->timingfd;
00783    ast_string_field_set(tmp, name, "**Unknown**");
00784 
00785    /* Initial state */
00786    tmp->_state = state;
00787 
00788    tmp->streamid = -1;
00789    
00790    tmp->fin = global_fin;
00791    tmp->fout = global_fout;
00792 
00793    if (ast_strlen_zero(ast_config_AST_SYSTEM_NAME)) {
00794       ast_string_field_build(tmp, uniqueid, "%li.%d", (long) time(NULL), 
00795          ast_atomic_fetchadd_int(&uniqueint, 1));
00796    } else {
00797       ast_string_field_build(tmp, uniqueid, "%s-%li.%d", ast_config_AST_SYSTEM_NAME, 
00798          (long) time(NULL), ast_atomic_fetchadd_int(&uniqueint, 1));
00799    }
00800 
00801    if (!ast_strlen_zero(name_fmt)) {
00802       /* Almost every channel is calling this function, and setting the name via the ast_string_field_build() call.
00803        * And they all use slightly different formats for their name string.
00804        * This means, to set the name here, we have to accept variable args, and call the string_field_build from here.
00805        * This means, that the stringfields must have a routine that takes the va_lists directly, and 
00806        * uses them to build the string, instead of forming the va_lists internally from the vararg ... list.
00807        * This new function was written so this can be accomplished.
00808        */
00809       va_start(ap1, name_fmt);
00810       va_start(ap2, name_fmt);
00811       ast_string_field_build_va(tmp, name, name_fmt, ap1, ap2);
00812       va_end(ap1);
00813       va_end(ap2);
00814 
00815       /* and now, since the channel structure is built, and has its name, let's call the
00816        * manager event generator with this Newchannel event. This is the proper and correct
00817        * place to make this call, but you sure do have to pass a lot of data into this func
00818        * to do it here!
00819        */
00820       manager_event(EVENT_FLAG_CALL, "Newchannel",
00821                "Channel: %s\r\n"
00822                "State: %s\r\n"
00823                "CallerIDNum: %s\r\n"
00824                "CallerIDName: %s\r\n"
00825                "Uniqueid: %s\r\n",
00826                tmp->name, ast_state2str(state),
00827                S_OR(cid_num, "<unknown>"),
00828                S_OR(cid_name, "<unknown>"),
00829                tmp->uniqueid);
00830    }
00831 
00832    /* Reminder for the future: under what conditions do we NOT want to track cdrs on channels? */
00833 
00834    /* These 4 variables need to be set up for the cdr_init() to work right */
00835    if (amaflag)
00836       tmp->amaflags = amaflag;
00837    else
00838       tmp->amaflags = ast_default_amaflags;
00839    
00840    if (!ast_strlen_zero(acctcode))
00841       ast_string_field_set(tmp, accountcode, acctcode);
00842    else
00843       ast_string_field_set(tmp, accountcode, ast_default_accountcode);
00844       
00845    if (!ast_strlen_zero(context))
00846       ast_copy_string(tmp->context, context, sizeof(tmp->context));
00847    else
00848       strcpy(tmp->context, "default");
00849 
00850    if (!ast_strlen_zero(exten))
00851       ast_copy_string(tmp->exten, exten, sizeof(tmp->exten));
00852    else
00853       strcpy(tmp->exten, "s");
00854 
00855    tmp->priority = 1;
00856       
00857    tmp->cdr = ast_cdr_alloc();
00858    ast_cdr_init(tmp->cdr, tmp);
00859    ast_cdr_start(tmp->cdr);
00860    
00861    headp = &tmp->varshead;
00862    AST_LIST_HEAD_INIT_NOLOCK(headp);
00863    
00864    ast_mutex_init(&tmp->lock);
00865    
00866    AST_LIST_HEAD_INIT_NOLOCK(&tmp->datastores);
00867    
00868    ast_string_field_set(tmp, language, defaultlanguage);
00869 
00870    tmp->tech = &null_tech;
00871 
00872    AST_LIST_LOCK(&channels);
00873    AST_LIST_INSERT_HEAD(&channels, tmp, chan_list);
00874    AST_LIST_UNLOCK(&channels);
00875 
00876    return tmp;
00877 }

static int ast_channel_best_codec ( struct ast_channel * channel ) [inline, static]

Pick the best codec from channel nativeformats.

Parameters:

channel

channel, from that nativeformats used

Definition at line 1106 of file channel.h.

References ast_best_codec(), and ast_channel::nativeformats.

Referenced by ast_set_best_format().

01107 {
01108 #ifndef BUG_4825 
01109    return ast_best_codec(channel->nativeformats);
01110 #else 
01111    return ast_best_codec(channel->nativeformats.audio_bits);
01112 #endif   
01113 }

int ast_channel_bridge	(	struct ast_channel *	c0,
		struct ast_channel *	c1,
		struct ast_bridge_config *	config,
		struct ast_frame **	fo,
		struct ast_channel **	rc
	)

Bridge two channels together.

Bridge two channels together

Parameters:

	c0	first channel to bridge
	c1	second channel to bridge
	config	config for the channels
	fo	destination frame(?)
	rc	destination channel(?) Bridge two channels (c0 and c1) together. If an important frame occurs, we return that frame in rf (remember, it could be NULL) and which channel (0 or 1) in rc

Definition at line 3937 of file channel.c.

References ast_channel::_bridge, ast_channel::_softhangup, AST_BRIDGE_COMPLETE, AST_BRIDGE_FAILED, AST_BRIDGE_FAILED_NOWARN, AST_BRIDGE_RETRY, ast_channel_make_compatible(), ast_check_hangup(), ast_check_hangup_locked(), ast_clear_flag, AST_FEATURE_PLAY_WARNING, AST_FEATURE_REDIRECT, AST_FLAG_END_DTMF_ONLY, AST_FLAG_NBRIDGE, AST_FLAG_ZOMBIE, ast_generic_bridge(), ast_log(), ast_set_flag, AST_SOFTHANGUP_UNBRIDGE, ast_test_flag, ast_tvadd(), ast_tvsub(), ast_verbose(), ast_channel_tech::bridge, bridge_playfile(), ast_channel::cid, ast_callerid::cid_num, config, EVENT_FLAG_CALL, ast_channel::generator, LOG_DEBUG, LOG_WARNING, manager_event(), ast_channel::monitor, ast_channel::nativeformats, option_verbose, ast_channel::readformat, ast_channel_tech::send_digit_begin, ast_channel::spies, t, ast_channel::tech, VERBOSE_PREFIX_3, and ast_channel::writeformat.

Referenced by ast_bridge_call().

03939 {
03940    struct ast_channel *who = NULL;
03941    enum ast_bridge_result res = AST_BRIDGE_COMPLETE;
03942    int nativefailed=0;
03943    int firstpass;
03944    int o0nativeformats;
03945    int o1nativeformats;
03946    long time_left_ms=0;
03947    struct timeval nexteventts = { 0, };
03948    char caller_warning = 0;
03949    char callee_warning = 0;
03950 
03951    if (c0->_bridge) {
03952       ast_log(LOG_WARNING, "%s is already in a bridge with %s\n",
03953          c0->name, c0->_bridge->name);
03954       return -1;
03955    }
03956    if (c1->_bridge) {
03957       ast_log(LOG_WARNING, "%s is already in a bridge with %s\n",
03958          c1->name, c1->_bridge->name);
03959       return -1;
03960    }
03961    
03962    /* Stop if we're a zombie or need a soft hangup */
03963    if (ast_test_flag(c0, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c0) ||
03964        ast_test_flag(c1, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c1))
03965       return -1;
03966 
03967    *fo = NULL;
03968    firstpass = config->firstpass;
03969    config->firstpass = 0;
03970 
03971    if (ast_tvzero(config->start_time))
03972       config->start_time = ast_tvnow();
03973    time_left_ms = config->timelimit;
03974 
03975    caller_warning = ast_test_flag(&config->features_caller, AST_FEATURE_PLAY_WARNING);
03976    callee_warning = ast_test_flag(&config->features_callee, AST_FEATURE_PLAY_WARNING);
03977 
03978    if (config->start_sound && firstpass) {
03979       if (caller_warning)
03980          bridge_playfile(c0, c1, config->start_sound, time_left_ms / 1000);
03981       if (callee_warning)
03982          bridge_playfile(c1, c0, config->start_sound, time_left_ms / 1000);
03983    }
03984 
03985    /* Keep track of bridge */
03986    c0->_bridge = c1;
03987    c1->_bridge = c0;
03988 
03989    /* \todo  XXX here should check that cid_num is not NULL */
03990    manager_event(EVENT_FLAG_CALL, "Link",
03991             "Channel1: %s\r\n"
03992             "Channel2: %s\r\n"
03993             "Uniqueid1: %s\r\n"
03994             "Uniqueid2: %s\r\n"
03995             "CallerID1: %s\r\n"
03996             "CallerID2: %s\r\n",
03997             c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
03998 
03999    o0nativeformats = c0->nativeformats;
04000    o1nativeformats = c1->nativeformats;
04001 
04002    if (config->feature_timer) {
04003       nexteventts = ast_tvadd(config->start_time, ast_samp2tv(config->feature_timer, 1000));
04004    } else if (config->timelimit) {
04005       nexteventts = ast_tvadd(config->start_time, ast_samp2tv(config->timelimit, 1000));
04006       if (caller_warning || callee_warning)
04007          nexteventts = ast_tvsub(nexteventts, ast_samp2tv(config->play_warning, 1000));
04008    }
04009 
04010    if (!c0->tech->send_digit_begin)
04011       ast_set_flag(c1, AST_FLAG_END_DTMF_ONLY);
04012    if (!c1->tech->send_digit_begin)
04013       ast_set_flag(c0, AST_FLAG_END_DTMF_ONLY);
04014 
04015    for (/* ever */;;) {
04016       struct timeval now = { 0, };
04017       int to;
04018 
04019       to = -1;
04020 
04021       if (!ast_tvzero(nexteventts)) {
04022          now = ast_tvnow();
04023          to = ast_tvdiff_ms(nexteventts, now);
04024          if (to <= 0) {
04025             if (!config->timelimit) {
04026                res = AST_BRIDGE_COMPLETE;
04027                break;
04028             }
04029             to = 0;
04030          }
04031       }
04032 
04033       if (config->timelimit) {
04034          time_left_ms = config->timelimit - ast_tvdiff_ms(now, config->start_time);
04035          if (time_left_ms < to)
04036             to = time_left_ms;
04037 
04038          if (time_left_ms <= 0) {
04039             if (caller_warning && config->end_sound)
04040                bridge_playfile(c0, c1, config->end_sound, 0);
04041             if (callee_warning && config->end_sound)
04042                bridge_playfile(c1, c0, config->end_sound, 0);
04043             *fo = NULL;
04044             if (who)
04045                *rc = who;
04046             res = 0;
04047             break;
04048          }
04049          
04050          if (!to) {
04051             if (time_left_ms >= 5000 && config->warning_sound && config->play_warning) {
04052                int t = (time_left_ms + 500) / 1000; /* round to nearest second */
04053                if (caller_warning)
04054                   bridge_playfile(c0, c1, config->warning_sound, t);
04055                if (callee_warning)
04056                   bridge_playfile(c1, c0, config->warning_sound, t);
04057             }
04058             if (config->warning_freq && (time_left_ms > (config->warning_freq + 5000)))
04059                nexteventts = ast_tvadd(nexteventts, ast_samp2tv(config->warning_freq, 1000));
04060             else
04061                nexteventts = ast_tvadd(config->start_time, ast_samp2tv(config->timelimit, 1000));
04062          }
04063       }
04064 
04065       if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE || c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE) {
04066          if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
04067             c0->_softhangup = 0;
04068          if (c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
04069             c1->_softhangup = 0;
04070          c0->_bridge = c1;
04071          c1->_bridge = c0;
04072          if (option_debug)
04073             ast_log(LOG_DEBUG, "Unbridge signal received. Ending native bridge.\n");
04074          continue;
04075       }
04076       
04077       /* Stop if we're a zombie or need a soft hangup */
04078       if (ast_test_flag(c0, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c0) ||
04079           ast_test_flag(c1, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c1)) {
04080          *fo = NULL;
04081          if (who)
04082             *rc = who;
04083          res = 0;
04084          if (option_debug)
04085             ast_log(LOG_DEBUG, "Bridge stops because we're zombie or need a soft hangup: c0=%s, c1=%s, flags: %s,%s,%s,%s\n",
04086                c0->name, c1->name,
04087                ast_test_flag(c0, AST_FLAG_ZOMBIE) ? "Yes" : "No",
04088                ast_check_hangup(c0) ? "Yes" : "No",
04089                ast_test_flag(c1, AST_FLAG_ZOMBIE) ? "Yes" : "No",
04090                ast_check_hangup(c1) ? "Yes" : "No");
04091          break;
04092       }
04093 
04094       if (c0->tech->bridge &&
04095           (config->timelimit == 0) &&
04096           (c0->tech->bridge == c1->tech->bridge) &&
04097           !nativefailed && !c0->monitor && !c1->monitor &&
04098           !c0->spies && !c1->spies && !ast_test_flag(&(config->features_callee),AST_FEATURE_REDIRECT) &&
04099           !ast_test_flag(&(config->features_caller),AST_FEATURE_REDIRECT) ) {
04100          /* Looks like they share a bridge method and nothing else is in the way */
04101          ast_set_flag(c0, AST_FLAG_NBRIDGE);
04102          ast_set_flag(c1, AST_FLAG_NBRIDGE);
04103          if ((res = c0->tech->bridge(c0, c1, config->flags, fo, rc, to)) == AST_BRIDGE_COMPLETE) {
04104             /* \todo  XXX here should check that cid_num is not NULL */
04105             manager_event(EVENT_FLAG_CALL, "Unlink",
04106                      "Channel1: %s\r\n"
04107                      "Channel2: %s\r\n"
04108                      "Uniqueid1: %s\r\n"
04109                      "Uniqueid2: %s\r\n"
04110                      "CallerID1: %s\r\n"
04111                      "CallerID2: %s\r\n",
04112                      c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
04113             if (option_debug)
04114                ast_log(LOG_DEBUG, "Returning from native bridge, channels: %s, %s\n", c0->name, c1->name);
04115 
04116             ast_clear_flag(c0, AST_FLAG_NBRIDGE);
04117             ast_clear_flag(c1, AST_FLAG_NBRIDGE);
04118 
04119             if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE || c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
04120                continue;
04121 
04122             c0->_bridge = NULL;
04123             c1->_bridge = NULL;
04124 
04125             return res;
04126          } else {
04127             ast_clear_flag(c0, AST_FLAG_NBRIDGE);
04128             ast_clear_flag(c1, AST_FLAG_NBRIDGE);
04129          }
04130          switch (res) {
04131          case AST_BRIDGE_RETRY:
04132             continue;
04133          default:
04134             if (option_verbose > 2)
04135                ast_verbose(VERBOSE_PREFIX_3 "Native bridging %s and %s ended\n",
04136                       c0->name, c1->name);
04137             /* fallthrough */
04138          case AST_BRIDGE_FAILED_NOWARN:
04139             nativefailed++;
04140             break;
04141          }
04142       }
04143    
04144       if (((c0->writeformat != c1->readformat) || (c0->readformat != c1->writeformat) ||
04145           (c0->nativeformats != o0nativeformats) || (c1->nativeformats != o1nativeformats)) &&
04146           !(c0->generator || c1->generator)) {
04147          if (ast_channel_make_compatible(c0, c1)) {
04148             ast_log(LOG_WARNING, "Can't make %s and %s compatible\n", c0->name, c1->name);
04149             /* \todo  XXX here should check that cid_num is not NULL */
04150                                 manager_event(EVENT_FLAG_CALL, "Unlink",
04151                      "Channel1: %s\r\n"
04152                      "Channel2: %s\r\n"
04153                      "Uniqueid1: %s\r\n"
04154                      "Uniqueid2: %s\r\n"
04155                      "CallerID1: %s\r\n"
04156                      "CallerID2: %s\r\n",
04157                      c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
04158             return AST_BRIDGE_FAILED;
04159          }
04160          o0nativeformats = c0->nativeformats;
04161          o1nativeformats = c1->nativeformats;
04162       }
04163       res = ast_generic_bridge(c0, c1, config, fo, rc, nexteventts);
04164       if (res != AST_BRIDGE_RETRY)
04165          break;
04166    }
04167 
04168    ast_clear_flag(c0, AST_FLAG_END_DTMF_ONLY);
04169    ast_clear_flag(c1, AST_FLAG_END_DTMF_ONLY);
04170 
04171    c0->_bridge = NULL;
04172    c1->_bridge = NULL;
04173 
04174    /* \todo  XXX here should check that cid_num is not NULL */
04175    manager_event(EVENT_FLAG_CALL, "Unlink",
04176             "Channel1: %s\r\n"
04177             "Channel2: %s\r\n"
04178             "Uniqueid1: %s\r\n"
04179             "Uniqueid2: %s\r\n"
04180             "CallerID1: %s\r\n"
04181             "CallerID2: %s\r\n",
04182             c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
04183    if (option_debug)
04184       ast_log(LOG_DEBUG, "Bridge stops bridging channels %s and %s\n", c0->name, c1->name);
04185 
04186    return res;
04187 }

int ast_channel_cmpwhentohangup	(	struct ast_channel *	chan,
		time_t	offset
	)

Compare a offset with the settings of when to hang a channel up.

Parameters:

	chan	channel on which to check for hang up
	offset	offset in seconds from current time

Returns:: 1, 0, or -1 This function compares a offset from current time with the absolute time out on a channel (when to hang up). If the absolute time out on a channel is earlier than current time plus the offset, it returns 1, if the two time values are equal, it return 0, otherwise, it retturn -1.

Definition at line 486 of file channel.c.

References ast_channel::whentohangup.

00487 {
00488    time_t whentohangup;
00489 
00490    if (chan->whentohangup == 0) {
00491       return (offset == 0) ? 0 : -1;
00492    } else {
00493       if (offset == 0)  /* XXX why is this special ? */
00494          return (1);
00495       else {
00496          whentohangup = offset + time (NULL);
00497          if (chan->whentohangup < whentohangup)
00498             return (1);
00499          else if (chan->whentohangup == whentohangup)
00500             return (0);
00501          else
00502             return (-1);
00503       }
00504    }
00505 }

int ast_channel_datastore_add	(	struct ast_channel *	chan,
		struct ast_datastore *	datastore
	)

Add a datastore to a channel.

Definition at line 1278 of file channel.c.

References AST_LIST_INSERT_HEAD.

Referenced by speech_create().

01279 {
01280    int res = 0;
01281 
01282    AST_LIST_INSERT_HEAD(&chan->datastores, datastore, entry);
01283 
01284    return res;
01285 }

struct ast_datastore* ast_channel_datastore_alloc	(	const struct ast_datastore_info *	info,
		char *	uid
	)

Create a channel datastore structure.

Definition at line 1234 of file channel.c.

References ast_calloc, ast_strdup, and ast_datastore::info.

Referenced by speech_create().

01235 {
01236    struct ast_datastore *datastore = NULL;
01237 
01238    /* Make sure we at least have type so we can identify this */
01239    if (info == NULL) {
01240       return NULL;
01241    }
01242 
01243    /* Allocate memory for datastore and clear it */
01244    datastore = ast_calloc(1, sizeof(*datastore));
01245    if (datastore == NULL) {
01246       return NULL;
01247    }
01248 
01249    datastore->info = info;
01250 
01251    datastore->uid = ast_strdup(uid);
01252 
01253    return datastore;
01254 }

struct ast_datastore* ast_channel_datastore_find	(	struct ast_channel *	chan,
		const struct ast_datastore_info *	info,
		char *	uid
	)

Find a datastore on a channel.

Definition at line 1305 of file channel.c.

References AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, ast_datastore::info, and ast_datastore::uid.

Referenced by find_speech(), speech_background(), and speech_destroy().

01306 {
01307    struct ast_datastore *datastore = NULL;
01308    
01309    if (info == NULL)
01310       return NULL;
01311 
01312    AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->datastores, datastore, entry) {
01313       if (datastore->info == info) {
01314          if (uid != NULL && datastore->uid != NULL) {
01315             if (!strcasecmp(uid, datastore->uid)) {
01316                /* Matched by type AND uid */
01317                break;
01318             }
01319          } else {
01320             /* Matched by type at least */
01321             break;
01322          }
01323       }
01324    }
01325    AST_LIST_TRAVERSE_SAFE_END
01326 
01327    return datastore;
01328 }

int ast_channel_datastore_free ( struct ast_datastore * datastore )

Free a channel datastore structure.

Definition at line 1256 of file channel.c.

References ast_datastore::data, ast_datastore_info::destroy, free, ast_datastore::info, and ast_datastore::uid.

Referenced by ast_channel_free().

01257 {
01258    int res = 0;
01259 
01260    /* Using the destroy function (if present) destroy the data */
01261    if (datastore->info->destroy != NULL && datastore->data != NULL) {
01262       datastore->info->destroy(datastore->data);
01263       datastore->data = NULL;
01264    }
01265 
01266    /* Free allocated UID memory */
01267    if (datastore->uid != NULL) {
01268       free(datastore->uid);
01269       datastore->uid = NULL;
01270    }
01271 
01272    /* Finally free memory used by ourselves */
01273    free(datastore);
01274 
01275    return res;
01276 }

int ast_channel_datastore_remove	(	struct ast_channel *	chan,
		struct ast_datastore *	datastore
	)

Remove a datastore from a channel.

Definition at line 1287 of file channel.c.

References AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, and AST_LIST_TRAVERSE_SAFE_END.

Referenced by speech_background(), and speech_destroy().

01288 {
01289    struct ast_datastore *datastore2 = NULL;
01290    int res = -1;
01291 
01292    /* Find our position and remove ourselves */
01293    AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->datastores, datastore2, entry) {
01294       if (datastore2 == datastore) {
01295          AST_LIST_REMOVE_CURRENT(&chan->datastores, entry);
01296          res = 0;
01297          break;
01298       }
01299    }
01300    AST_LIST_TRAVERSE_SAFE_END
01301 
01302    return res;
01303 }

int ast_channel_defer_dtmf ( struct ast_channel * chan )

Set defer DTMF flag on channel.

Defer DTMF so that you only read things like hangups and audio. Returns non-zero if channel was already DTMF-deferred or 0 if channel is just now being DTMF-deferred

Definition at line 971 of file channel.c.

References AST_FLAG_DEFER_DTMF, ast_set_flag, and ast_test_flag.

Referenced by __adsi_transmit_messages(), and find_cache().

00972 {
00973    int pre = 0;
00974 
00975    if (chan) {
00976       pre = ast_test_flag(chan, AST_FLAG_DEFER_DTMF);
00977       ast_set_flag(chan, AST_FLAG_DEFER_DTMF);
00978    }
00979    return pre;
00980 }

static void ast_channel_formats_reset ( struct ast_channel * channel ) [inline, static]

Definition at line 1137 of file channel.h.

References ast_get_read_format(), ast_get_write_format(), ast_log(), ast_set_read_format(), ast_set_write_format(), LOG_DEBUG, and option_debug.

01138 {
01139    int r, w;
01140    r = ast_get_read_format(channel);
01141    w = ast_get_write_format(channel);
01142 
01143    if (option_debug)
01144       ast_log(LOG_DEBUG, "Resetting read to %d and write to %d on channel %s\n", r, w, channel->name);
01145    if (r)
01146       ast_set_read_format(channel, r);
01147    if (w)
01148       ast_set_write_format(channel, w);
01149 }

void ast_channel_free ( struct ast_channel * )

Free a channel structure.

Definition at line 1152 of file channel.c.

References ast_channel::alertpipe, ast_app_group_discard(), ast_channel_datastore_free(), ast_channel_lock, AST_CHANNEL_NAME, ast_channel_unlock, ast_channel_whisper_stop(), ast_device_state_changed_literal(), ast_frfree(), ast_jb_destroy(), AST_LIST_HEAD_INIT_NOLOCK, AST_LIST_LOCK, AST_LIST_REMOVE, AST_LIST_REMOVE_HEAD, AST_LIST_UNLOCK, ast_log(), ast_moh_cleanup(), ast_mutex_destroy(), ast_string_field_free_pools, ast_translator_free_path(), ast_var_delete(), ast_channel::cid, f, free, free_cid(), ast_channel::lock, LOG_WARNING, ast_channel::monitor, ast_channel::music_state, name, ast_channel::pbx, ast_channel::readtrans, ast_channel::sched, sched_context_destroy(), ast_channel_monitor::stop, ast_channel::tech_pvt, ast_channel::timingfd, ast_channel::varshead, ast_channel::whisper, and ast_channel::writetrans.

Referenced by agent_cleanup(), agent_new(), ast_hangup(), ast_pbx_outgoing_cdr_failed(), local_new(), make_email_file(), pbx_substitute_variables_helper_full(), and sendpage().

01153 {
01154    int fd;
01155    struct ast_var_t *vardata;
01156    struct ast_frame *f;
01157    struct varshead *headp;
01158    struct ast_datastore *datastore = NULL;
01159    char name[AST_CHANNEL_NAME];
01160    
01161    headp=&chan->varshead;
01162    
01163    AST_LIST_LOCK(&channels);
01164    AST_LIST_REMOVE(&channels, chan, chan_list);
01165    /* Lock and unlock the channel just to be sure nobody
01166       has it locked still */
01167    ast_channel_lock(chan);
01168    ast_channel_unlock(chan);
01169    if (chan->tech_pvt) {
01170       ast_log(LOG_WARNING, "Channel '%s' may not have been hung up properly\n", chan->name);
01171       free(chan->tech_pvt);
01172    }
01173 
01174    if (chan->sched)
01175       sched_context_destroy(chan->sched);
01176 
01177    ast_copy_string(name, chan->name, sizeof(name));
01178 
01179    /* Stop monitoring */
01180    if (chan->monitor)
01181       chan->monitor->stop( chan, 0 );
01182 
01183    /* If there is native format music-on-hold state, free it */
01184    if (chan->music_state)
01185       ast_moh_cleanup(chan);
01186 
01187    /* if someone is whispering on the channel, stop them */
01188    if (chan->whisper)
01189       ast_channel_whisper_stop(chan);
01190 
01191    /* Free translators */
01192    if (chan->readtrans)
01193       ast_translator_free_path(chan->readtrans);
01194    if (chan->writetrans)
01195       ast_translator_free_path(chan->writetrans);
01196    if (chan->pbx)
01197       ast_log(LOG_WARNING, "PBX may not have been terminated properly on '%s'\n", chan->name);
01198    free_cid(&chan->cid);
01199    ast_mutex_destroy(&chan->lock);
01200    /* Close pipes if appropriate */
01201    if ((fd = chan->alertpipe[0]) > -1)
01202       close(fd);
01203    if ((fd = chan->alertpipe[1]) > -1)
01204       close(fd);
01205    if ((fd = chan->timingfd) > -1)
01206       close(fd);
01207    while ((f = AST_LIST_REMOVE_HEAD(&chan->readq, frame_list)))
01208       ast_frfree(f);
01209    
01210    /* Get rid of each of the data stores on the channel */
01211    while ((datastore = AST_LIST_REMOVE_HEAD(&chan->datastores, entry)))
01212       /* Free the data store */
01213       ast_channel_datastore_free(datastore);
01214    AST_LIST_HEAD_INIT_NOLOCK(&chan->datastores);
01215 
01216    /* loop over the variables list, freeing all data and deleting list items */
01217    /* no need to lock the list, as the channel is already locked */
01218    
01219    while ((vardata = AST_LIST_REMOVE_HEAD(headp, entries)))
01220       ast_var_delete(vardata);
01221 
01222    ast_app_group_discard(chan);
01223 
01224    /* Destroy the jitterbuffer */
01225    ast_jb_destroy(chan);
01226 
01227    ast_string_field_free_pools(chan);
01228    free(chan);
01229    AST_LIST_UNLOCK(&channels);
01230 
01231    ast_device_state_changed_literal(name);
01232 }

static const char* ast_channel_getformatname ( struct ast_channel * chan ) [inline, static]

Definition at line 1128 of file channel.h.

References ast_getformatname(), and ast_channel::nativeformats.

01129 {
01130 #ifndef BUG_4825 
01131    return chan ? ast_getformatname(chan->nativeformats) : "undefined";
01132 #else 
01133    return chan ? ast_getformatname(chan->nativeformats.audio_bits) : "undefined";
01134 #endif   
01135 }

static char* ast_channel_getformatname_multiple	(	char *	buf,
		size_t	size,
		struct ast_channel *	chan
	)			`[inline, static]`

Get the names of a set of formats.

Parameters:

	buf	a buffer for the output string
	size	size of buf (bytes)
	channel	the channel Prints a list of readable codec names corresponding to "format". ex: for format=AST_FORMAT_GSM\|AST_FORMAT_SPEEX\|AST_FORMAT_ILBC it will return "0x602 (GSM\|SPEEX\|ILBC)"

Returns:: The return value is buf.

Definition at line 1122 of file channel.h.

References ast_getformatname_multiple(), and ast_channel::nativeformats.

01123 {
01124    return ast_getformatname_multiple(buf, size, chan->nativeformats);
01125 }

void ast_channel_inherit_variables	(	const struct ast_channel *	parent,
		struct ast_channel *	child
	)

Inherits channel variable from parent to child channel.

Parameters:

	parent	Parent channel
	child	Child channel

Scans all channel variables in the parent channel, looking for those that should be copied into the child channel. Variables whose names begin with a single '_' are copied into the child channel with the prefix removed. Variables whose names begin with '__' are copied into the child channel with their names unchanged.

Definition at line 3338 of file channel.c.

References AST_LIST_INSERT_TAIL, AST_LIST_TRAVERSE, ast_log(), ast_var_assign(), ast_var_full_name(), ast_var_name(), ast_var_value(), LOG_DEBUG, option_debug, and ast_channel::varshead.

Referenced by __ast_request_and_dial(), agent_call(), ast_feature_request_and_dial(), begin_dial(), findmeexec(), ring_entry(), and wait_for_answer().

03339 {
03340    struct ast_var_t *current, *newvar;
03341    const char *varname;
03342 
03343    AST_LIST_TRAVERSE(&parent->varshead, current, entries) {
03344       int vartype = 0;
03345 
03346       varname = ast_var_full_name(current);
03347       if (!varname)
03348          continue;
03349 
03350       if (varname[0] == '_') {
03351          vartype = 1;
03352          if (varname[1] == '_')
03353             vartype = 2;
03354       }
03355 
03356       switch (vartype) {
03357       case 1:
03358          newvar = ast_var_assign(&varname[1], ast_var_value(current));
03359          if (newvar) {
03360             AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
03361             if (option_debug)
03362                ast_log(LOG_DEBUG, "Copying soft-transferable variable %s.\n", ast_var_name(newvar));
03363          }
03364          break;
03365       case 2:
03366          newvar = ast_var_assign(ast_var_full_name(current), ast_var_value(current));
03367          if (newvar) {
03368             AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
03369             if (option_debug)
03370                ast_log(LOG_DEBUG, "Copying hard-transferable variable %s.\n", ast_var_name(newvar));
03371          }
03372          break;
03373       default:
03374          if (option_debug)
03375             ast_log(LOG_DEBUG, "Not copying variable %s.\n", ast_var_name(current));
03376          break;
03377       }
03378    }
03379 }

int ast_channel_make_compatible	(	struct ast_channel *	c0,
		struct ast_channel *	c1
	)

Makes two channel formats compatible.

Parameters:

	c0	first channel to make compatible
	c1	other channel to make compatible Set two channels to compatible formats -- call before ast_channel_bridge in general .

Returns:: Returns 0 on success and -1 if it could not be done

Definition at line 3212 of file channel.c.

References AST_FORMAT_SLINEAR, ast_log(), ast_opt_transcode_via_slin, ast_set_read_format(), ast_set_write_format(), ast_translate_path_steps(), ast_translator_best_choice(), LOG_WARNING, and ast_channel::nativeformats.

Referenced by app_exec(), ast_channel_bridge(), check_compat(), park_exec(), try_calling(), and wait_for_answer().

03213 {
03214    int src;
03215    int dst;
03216 
03217    /* Set up translation from the chan to the peer */
03218    src = chan->nativeformats;
03219    dst = peer->nativeformats;
03220    if (ast_translator_best_choice(&dst, &src) < 0) {
03221       ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", chan->name, src, peer->name, dst);
03222       return -1;
03223    }
03224 
03225    /* if the best path is not 'pass through', then
03226       transcoding is needed; if desired, force transcode path
03227       to use SLINEAR between channels, but only if there is
03228       no direct conversion available */
03229    if ((src != dst) && ast_opt_transcode_via_slin &&
03230        (ast_translate_path_steps(dst, src) != 1))
03231       dst = AST_FORMAT_SLINEAR;
03232    if (ast_set_read_format(chan, dst) < 0) {
03233       ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", chan->name, dst);
03234       return -1;
03235    }
03236    if (ast_set_write_format(peer, dst) < 0) {
03237       ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", peer->name, dst);
03238       return -1;
03239    }
03240 
03241    /* Set up translation from the peer to the chan */
03242    src = peer->nativeformats;
03243    dst = chan->nativeformats;
03244    if (ast_translator_best_choice(&dst, &src) < 0) {
03245       ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", peer->name, src, chan->name, dst);
03246       return -1;
03247    }
03248 
03249    /* if the best path is not 'pass through', then
03250       transcoding is needed; if desired, force transcode path
03251       to use SLINEAR between channels, but only if there is
03252       no direct conversion available */
03253    if ((src != dst) && ast_opt_transcode_via_slin &&
03254        (ast_translate_path_steps(dst, src) != 1))
03255       dst = AST_FORMAT_SLINEAR;
03256    if (ast_set_read_format(peer, dst) < 0) {
03257       ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", peer->name, dst);
03258       return -1;
03259    }
03260    if (ast_set_write_format(chan, dst) < 0) {
03261       ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", chan->name, dst);
03262       return -1;
03263    }
03264    return 0;
03265 }

int ast_channel_masquerade	(	struct ast_channel *	original,
		struct ast_channel *	clone
	)

Weird function made for call transfers.

Parameters:

	original	channel to make a copy of
	clone	copy of the original channel This is a very strange and freaky function used primarily for transfer. Suppose that "original" and "clone" are two channels in random situations. This function takes the guts out of "clone" and puts them into the "original" channel, then alerts the channel driver of the change, asking it to fixup any private information (like the p->owner pointer) that is affected by the change. The physical layer of the original channel is hung up.

Definition at line 3267 of file channel.c.

References ast_channel::_bridge, ast_bridged_channel(), ast_channel_lock, ast_channel_trylock, ast_channel_unlock, ast_log(), ast_null_frame, ast_queue_frame(), LOG_DEBUG, LOG_WARNING, ast_channel::masq, ast_channel::masqr, and option_debug.

Referenced by ast_async_goto(), ast_masq_park_call(), ast_pickup_call(), attempt_transfer(), builtin_atxfer(), check_availability(), check_bridge(), check_goto_on_transfer(), handle_invite_replaces(), iax_park(), misdn_transfer_bc(), pickup_do(), and sip_park().

03268 {
03269    int res = -1;
03270    struct ast_channel *final_orig = original, *final_clone = clone;
03271 
03272    ast_channel_lock(original);
03273    while (ast_channel_trylock(clone)) {
03274       ast_channel_unlock(original);
03275       usleep(1);
03276       ast_channel_lock(original);
03277    }
03278 
03279    /* each of these channels may be sitting behind a channel proxy (i.e. chan_agent)
03280       and if so, we don't really want to masquerade it, but its proxy */
03281    if (original->_bridge && (original->_bridge != ast_bridged_channel(original)) && (original->_bridge->_bridge != original))
03282       final_orig = original->_bridge;
03283 
03284    if (clone->_bridge && (clone->_bridge != ast_bridged_channel(clone)) && (clone->_bridge->_bridge != clone))
03285       final_clone = clone->_bridge;
03286 
03287    if ((final_orig != original) || (final_clone != clone)) {
03288       ast_channel_lock(final_orig);
03289       while (ast_channel_trylock(final_clone)) {
03290          ast_channel_unlock(final_orig);
03291          usleep(1);
03292          ast_channel_lock(final_orig);
03293       }
03294       ast_channel_unlock(clone);
03295       ast_channel_unlock(original);
03296       original = final_orig;
03297       clone = final_clone;
03298    }
03299 
03300    if (original == clone) {
03301       ast_log(LOG_WARNING, "Can't masquerade channel '%s' into itself!\n", original->name);
03302       ast_channel_unlock(clone);
03303       ast_channel_unlock(original);
03304       return -1;
03305    }
03306 
03307    if (option_debug)
03308       ast_log(LOG_DEBUG, "Planning to masquerade channel %s into the structure of %s\n",
03309          clone->name, original->name);
03310    if (original->masq) {
03311       ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
03312          original->masq->name, original->name);
03313    } else if (clone->masqr) {
03314       ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
03315          clone->name, clone->masqr->name);
03316    } else {
03317       original->masq = clone;
03318       clone->masqr = original;
03319       ast_queue_frame(original, &ast_null_frame);
03320       ast_queue_frame(clone, &ast_null_frame);
03321       if (option_debug)
03322          ast_log(LOG_DEBUG, "Done planning to masquerade channel %s into the structure of %s\n", clone->name, original->name);
03323       res = 0;
03324    }
03325 
03326    ast_channel_unlock(clone);
03327    ast_channel_unlock(original);
03328 
03329    return res;
03330 }

struct ast_frame* ast_channel_queryoption	(	struct ast_channel *	channel,
		int	option,
		void *	data,
		int *	datalen,
		int	block
	)

Query the value of an option, optionally blocking until a reply is received Works similarly to setoption except only reads the options.

int ast_channel_register ( const struct ast_channel_tech * tech )

Register a channel technology (a new channel driver) Called by a channel module to register the kind of channels it supports.

Parameters:

tech

Structure defining channel technology or "type"

Returns:: Returns 0 on success, -1 on failure.

Definition at line 508 of file channel.c.

References ast_calloc, AST_LIST_INSERT_HEAD, AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_verbose(), LOG_DEBUG, LOG_WARNING, option_debug, option_verbose, chanlist::tech, ast_channel_tech::type, and VERBOSE_PREFIX_2.

Referenced by load_module(), and unload_module().

00509 {
00510    struct chanlist *chan;
00511 
00512    AST_LIST_LOCK(&channels);
00513 
00514    AST_LIST_TRAVERSE(&backends, chan, list) {
00515       if (!strcasecmp(tech->type, chan->tech->type)) {
00516          ast_log(LOG_WARNING, "Already have a handler for type '%s'\n", tech->type);
00517          AST_LIST_UNLOCK(&channels);
00518          return -1;
00519       }
00520    }
00521    
00522    if (!(chan = ast_calloc(1, sizeof(*chan)))) {
00523       AST_LIST_UNLOCK(&channels);
00524       return -1;
00525    }
00526    chan->tech = tech;
00527    AST_LIST_INSERT_HEAD(&backends, chan, list);
00528 
00529    if (option_debug)
00530       ast_log(LOG_DEBUG, "Registered handler for '%s' (%s)\n", chan->tech->type, chan->tech->description);
00531 
00532    if (option_verbose > 1)
00533       ast_verbose(VERBOSE_PREFIX_2 "Registered channel type '%s' (%s)\n", chan->tech->type,
00534              chan->tech->description);
00535 
00536    AST_LIST_UNLOCK(&channels);
00537    return 0;
00538 }

int ast_channel_sendhtml	(	struct ast_channel *	channel,
		int	subclass,
		const char *	data,
		int	datalen
	)

Send HTML or URL on link. Returns 0 on success or -1 on failure

Definition at line 3200 of file channel.c.

References ast_channel_tech::send_html, and ast_channel::tech.

Referenced by agent_sendhtml(), ast_channel_sendurl(), and wait_for_answer().

03201 {
03202    if (chan->tech->send_html)
03203       return chan->tech->send_html(chan, subclass, data, datalen);
03204    return -1;
03205 }

int ast_channel_sendurl	(	struct ast_channel *	channel,
		const char *	url
	)

Send URL on link. Returns 0 on success or -1 on failure

Definition at line 3207 of file channel.c.

References ast_channel_sendhtml(), and AST_HTML_URL.

Referenced by sendurl_exec(), and try_calling().

03208 {
03209    return ast_channel_sendhtml(chan, AST_HTML_URL, url, strlen(url) + 1);
03210 }

int ast_channel_setoption	(	struct ast_channel *	channel,
		int	option,
		void *	data,
		int	datalen,
		int	block
	)

Sets an option on a channel.

Parameters:

	channel	channel to set options on
	option	option to change
	data	data specific to option
	datalen	length of the data
	block	blocking or not Set an option on a channel (see frame.h), optionally blocking awaiting the reply Returns 0 on success and -1 on failure

Definition at line 4190 of file channel.c.

References ast_log(), LOG_ERROR, ast_channel_tech::setoption, and ast_channel::tech.

Referenced by ast_bridge_call(), common_exec(), conf_run(), func_channel_write(), handle_tddmode(), play_record_review(), reset_volumes(), rpt(), set_listen_volume(), set_talk_volume(), set_volume(), try_calling(), vm_forwardoptions(), and zt_hangup().

04191 {
04192    int res;
04193 
04194    if (chan->tech->setoption) {
04195       res = chan->tech->setoption(chan, option, data, datalen);
04196       if (res < 0)
04197          return res;
04198    } else {
04199       errno = ENOSYS;
04200       return -1;
04201    }
04202    if (block) {
04203       /* XXX Implement blocking -- just wait for our option frame reply, discarding
04204          intermediate packets. XXX */
04205       ast_log(LOG_ERROR, "XXX Blocking not implemented yet XXX\n");
04206       return -1;
04207    }
04208    return 0;
04209 }

void ast_channel_setwhentohangup	(	struct ast_channel *	chan,
		time_t	offset
	)

Set when to hang a channel up.

Parameters:

	chan	channel on which to check for hang up
	offset	offset in seconds from current time of when to hang up This function sets the absolute time out on a channel (when to hang up).

Definition at line 478 of file channel.c.

References ast_null_frame, ast_queue_frame(), and ast_channel::whentohangup.

Referenced by action_timeout(), and timeout_write().

00479 {
00480    chan->whentohangup = offset ? time(NULL) + offset : 0;
00481    ast_queue_frame(chan, &ast_null_frame);
00482    return;
00483 }

struct ast_silence_generator* ast_channel_start_silence_generator ( struct ast_channel * chan )

Starts a silence generator on the given channel.

Parameters:

chan

The channel to generate silence on

Returns:: An ast_silence_generator pointer, or NULL if an error occurs

This function will cause SLINEAR silence to be generated on the supplied channel until it is disabled; if the channel cannot be put into SLINEAR mode then the function will fail.

The pointer returned by this function must be preserved and passed to ast_channel_stop_silence_generator when you wish to stop the silence generation.

Definition at line 4638 of file channel.c.

References ast_activate_generator(), ast_calloc, AST_FORMAT_SLINEAR, ast_log(), ast_set_write_format(), free, LOG_DEBUG, LOG_ERROR, ast_silence_generator::old_write_format, silence_generator, and ast_channel::writeformat.

Referenced by __ast_play_and_record(), and channel_spy().

04639 {
04640    struct ast_silence_generator *state;
04641 
04642    if (!(state = ast_calloc(1, sizeof(*state)))) {
04643       return NULL;
04644    }
04645 
04646    state->old_write_format = chan->writeformat;
04647 
04648    if (ast_set_write_format(chan, AST_FORMAT_SLINEAR) < 0) {
04649       ast_log(LOG_ERROR, "Could not set write format to SLINEAR\n");
04650       free(state);
04651       return NULL;
04652    }
04653 
04654    ast_activate_generator(chan, &silence_generator, state);
04655 
04656    if (option_debug)
04657       ast_log(LOG_DEBUG, "Started silence generator on '%s'\n", chan->name);
04658 
04659    return state;
04660 }

void ast_channel_stop_silence_generator	(	struct ast_channel *	chan,
		struct ast_silence_generator *	state
	)

Stops a previously-started silence generator on the given channel.

Parameters:

	chan	The channel to operate on
	state	The ast_silence_generator pointer return by a previous call to ast_channel_start_silence_generator.

Returns:: nothing

This function will stop the operating silence generator and return the channel to its previous write format.

Definition at line 4662 of file channel.c.

References ast_deactivate_generator(), ast_log(), ast_set_write_format(), free, LOG_DEBUG, LOG_ERROR, and ast_silence_generator::old_write_format.

Referenced by __ast_play_and_record(), and channel_spy().

04663 {
04664    if (!state)
04665       return;
04666 
04667    ast_deactivate_generator(chan);
04668 
04669    if (option_debug)
04670       ast_log(LOG_DEBUG, "Stopped silence generator on '%s'\n", chan->name);
04671 
04672    if (ast_set_write_format(chan, state->old_write_format) < 0)
04673       ast_log(LOG_ERROR, "Could not return write format to its original state\n");
04674 
04675    free(state);
04676 }

int ast_channel_supports_html ( struct ast_channel * channel )

Returns 0 if channel does not support HTML or non-zero if it does

Definition at line 3195 of file channel.c.

References ast_channel_tech::send_html, and ast_channel::tech.

Referenced by sendurl_exec(), and try_calling().

03196 {
03197    return (chan->tech->send_html) ? 1 : 0;
03198 }

void ast_channel_undefer_dtmf ( struct ast_channel * chan )

Unset defer DTMF flag on channel.

Undo defer. ast_read will return any dtmf characters that were queued

Definition at line 983 of file channel.c.

References ast_clear_flag, and AST_FLAG_DEFER_DTMF.

Referenced by __adsi_transmit_messages(), find_cache(), and rpt_call().

00984 {
00985    if (chan)
00986       ast_clear_flag(chan, AST_FLAG_DEFER_DTMF);
00987 }

void ast_channel_unregister ( const struct ast_channel_tech * tech )

Unregister a channel technology.

Parameters:

tech

Structure defining channel technology or "type" that was previously registered

Returns:: No return value.

Definition at line 540 of file channel.c.

References AST_LIST_LOCK, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, AST_LIST_UNLOCK, ast_log(), ast_verbose(), free, LOG_DEBUG, option_debug, option_verbose, chanlist::tech, ast_channel_tech::type, and VERBOSE_PREFIX_2.

Referenced by __unload_module(), and unload_module().

00541 {
00542    struct chanlist *chan;
00543 
00544    if (option_debug)
00545       ast_log(LOG_DEBUG, "Unregistering channel type '%s'\n", tech->type);
00546 
00547    AST_LIST_LOCK(&channels);
00548 
00549    AST_LIST_TRAVERSE_SAFE_BEGIN(&backends, chan, list) {
00550       if (chan->tech == tech) {
00551          AST_LIST_REMOVE_CURRENT(&backends, list);
00552          free(chan);
00553          if (option_verbose > 1)
00554             ast_verbose(VERBOSE_PREFIX_2 "Unregistered channel type '%s'\n", tech->type);
00555          break;   
00556       }
00557    }
00558    AST_LIST_TRAVERSE_SAFE_END
00559 
00560    AST_LIST_UNLOCK(&channels);
00561 }

struct ast_channel* ast_channel_walk_locked ( const struct ast_channel * prev )

Browse channels in use Browse the channels currently in use.

Parameters:

prev

where you want to start in the channel list

Returns:: Returns the next channel in the list, NULL on end. If it returns a channel, that channel *has been locked*!

Definition at line 1073 of file channel.c.

References channel_find_locked().

Referenced by action_status(), ast_complete_channels(), ast_pickup_call(), complete_ch_helper(), conf_exec(), handle_chanlist(), handle_chanlist_deprecated(), handle_core_set_debug_channel(), handle_debugchan_deprecated(), handle_nodebugchan_deprecated(), moh_on_off(), next_channel(), pickup_by_exten(), pickup_by_mark(), and softhangup_exec().

01074 {
01075    return channel_find_locked(prev, NULL, 0, NULL, NULL);
01076 }

int ast_channel_whisper_feed	(	struct ast_channel *	chan,
		struct ast_frame *	f
	)

Feed an audio frame into the whisper buffer on a channel.

Parameters:

	chan	The channel to whisper onto
	f	The frame to to whisper onto chan

Returns:: 0 for success, non-zero for failure

Definition at line 4876 of file channel.c.

References ast_mutex_lock(), ast_mutex_unlock(), ast_slinfactory_feed(), f, ast_channel_whisper_buffer::lock, ast_channel_whisper_buffer::sf, and ast_channel::whisper.

Referenced by channel_spy().

04877 {
04878    if (!chan->whisper)
04879       return -1;
04880 
04881    ast_mutex_lock(&chan->whisper->lock);
04882    ast_slinfactory_feed(&chan->whisper->sf, f);
04883    ast_mutex_unlock(&chan->whisper->lock);
04884 
04885    return 0;
04886 }

int ast_channel_whisper_start ( struct ast_channel * chan )

Begin 'whispering' onto a channel.

Parameters:

chan

The channel to whisper onto

Returns:: 0 for success, non-zero for failure

This function will add a whisper buffer onto a channel and set a flag causing writes to the channel to reduce the volume level of the written audio samples, and then to mix in audio from the whisper buffer if it is available.

Note:: Note: This function performs no locking; you must hold the channel's lock before calling this function.

Definition at line 4861 of file channel.c.

References ast_calloc, AST_FLAG_WHISPER, ast_mutex_init(), ast_set_flag, ast_slinfactory_init(), ast_channel_whisper_buffer::lock, ast_channel_whisper_buffer::sf, and ast_channel::whisper.

Referenced by channel_spy().

04862 {
04863    if (chan->whisper)
04864       return -1;
04865 
04866    if (!(chan->whisper = ast_calloc(1, sizeof(*chan->whisper))))
04867       return -1;
04868 
04869    ast_mutex_init(&chan->whisper->lock);
04870    ast_slinfactory_init(&chan->whisper->sf);
04871    ast_set_flag(chan, AST_FLAG_WHISPER);
04872 
04873    return 0;
04874 }

void ast_channel_whisper_stop ( struct ast_channel * chan )

Stop 'whispering' onto a channel.

Parameters:

chan

The channel to whisper onto

Returns:: 0 for success, non-zero for failure

Note: This function performs no locking; you must hold the channel's lock before calling this function.

Definition at line 4888 of file channel.c.

References ast_clear_flag, AST_FLAG_WHISPER, AST_FORMAT_SLINEAR, ast_mutex_destroy(), ast_set_write_format(), ast_slinfactory_destroy(), ast_translator_free_path(), free, ast_channel_whisper_buffer::original_format, ast_channel_whisper_buffer::path, ast_channel::whisper, and ast_channel::writeformat.

Referenced by ast_channel_free(), and channel_spy().

04889 {
04890    if (!chan->whisper)
04891       return;
04892 
04893    ast_clear_flag(chan, AST_FLAG_WHISPER);
04894    if (chan->whisper->path)
04895       ast_translator_free_path(chan->whisper->path);
04896    if (chan->whisper->original_format && chan->writeformat == AST_FORMAT_SLINEAR)
04897       ast_set_write_format(chan, chan->whisper->original_format);
04898    ast_slinfactory_destroy(&chan->whisper->sf);
04899    ast_mutex_destroy(&chan->whisper->lock);
04900    free(chan->whisper);
04901    chan->whisper = NULL;
04902 }

struct ast_variable* ast_channeltype_list ( void )

return an ast_variable list of channeltypes

Definition at line 180 of file channel.c.

References AST_LIST_TRAVERSE, ast_variable_new(), ast_channel_tech::description, chanlist::tech, ast_channel_tech::type, and var.

00181 {
00182    struct chanlist *cl;
00183    struct ast_variable *var=NULL, *prev = NULL;
00184    AST_LIST_TRAVERSE(&backends, cl, list) {
00185       if (prev)  {
00186          if ((prev->next = ast_variable_new(cl->tech->type, cl->tech->description)))
00187             prev = prev->next;
00188       } else {
00189          var = ast_variable_new(cl->tech->type, cl->tech->description);
00190          prev = var;
00191       }
00192    }
00193    return var;
00194 }

int ast_check_hangup ( struct ast_channel * chan )

Check to see if a channel is needing hang up.

Parameters:

chan

channel on which to check for hang up This function determines if the channel is being requested to be hung up.

Returns:: Returns 0 if not, or 1 if hang up is requested (including time-out).

Definition at line 402 of file channel.c.

References ast_channel::_softhangup, AST_SOFTHANGUP_TIMEOUT, ast_channel::tech_pvt, and ast_channel::whentohangup.

Referenced by __ast_read(), action_redirect(), app_exec(), ast_answer(), ast_call(), ast_channel_bridge(), ast_check_hangup_locked(), ast_feature_request_and_dial(), ast_indicate_data(), ast_readstring_full(), ast_recvtext(), ast_sendtext(), ast_transfer(), ast_udptl_bridge(), ast_waitfordigit_full(), ast_write(), bridge_native_loop(), bridge_p2p_loop(), builtin_atxfer(), channel_spy(), common_exec(), handle_sendimage(), rpt(), rpt_exec(), zt_sendtext(), and zt_setoption().

00403 {
00404    if (chan->_softhangup)     /* yes if soft hangup flag set */
00405       return 1;
00406    if (!chan->tech_pvt)    /* yes if no technology private data */
00407       return 1;
00408    if (!chan->whentohangup)   /* no if no hangup scheduled */
00409       return 0;
00410    if (chan->whentohangup > time(NULL))   /* no if hangup time has not come yet. */
00411       return 0;
00412    chan->_softhangup |= AST_SOFTHANGUP_TIMEOUT; /* record event */
00413    return 1;
00414 }

void ast_deactivate_generator ( struct ast_channel * chan )

Deactive an active generator

Definition at line 1779 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_clear_flag, AST_FLAG_WRITE_INT, AST_GENERATOR_FD, ast_settimeout(), ast_channel::fds, ast_channel::generator, ast_channel::generatordata, and ast_generator::release.

Referenced by __ast_read(), app_exec(), ast_channel_stop_silence_generator(), ast_openstream_full(), ast_playtones_stop(), ast_quiet_chan(), ast_tonepair_stop(), ast_write(), channel_spy(), generator_force(), local_ast_moh_stop(), milliwatt_exec(), moh_on_off(), and wait_for_answer().

01780 {
01781    ast_channel_lock(chan);
01782    if (chan->generatordata) {
01783       if (chan->generator && chan->generator->release)
01784          chan->generator->release(chan, chan->generatordata);
01785       chan->generatordata = NULL;
01786       chan->generator = NULL;
01787       chan->fds[AST_GENERATOR_FD] = -1;
01788       ast_clear_flag(chan, AST_FLAG_WRITE_INT);
01789       ast_settimeout(chan, 0, NULL, NULL);
01790    }
01791    ast_channel_unlock(chan);
01792 }

int ast_do_masquerade ( struct ast_channel * original )

Start masquerading a channel XXX This is a seriously wacked out operation. We're essentially putting the guts of the clone channel into the original channel. Start by killing off the original channel's backend. I'm not sure we're going to keep this function, because while the features are nice, the cost is very high in terms of pure nastiness. XXX.

Note:: Assumes channel will be locked when called

Definition at line 3403 of file channel.c.

References ast_channel::_state, ast_channel::alertpipe, ast_channel_lock, AST_LIST_FIRST, AST_LIST_HEAD_SET_NOLOCK, AST_LIST_TRAVERSE, ast_log(), ast_mutex_lock(), ast_mutex_unlock(), ast_string_field_set, ast_channel::cdr, ast_channel_spy::chan, EVENT_FLAG_CALL, free_translation(), ast_channel_spy::lock, ast_channel::lock, LOG_DEBUG, manager_event(), ast_channel::masq, ast_channel::masqr, name, option_debug, ast_channel::rawreadformat, ast_channel::rawwriteformat, ast_channel::readformat, ast_channel::spies, t, ast_channel::tech, ast_channel::tech_pvt, and ast_channel::writeformat.

Referenced by __ast_read(), ast_async_goto(), ast_hangup(), ast_waitfor_nandfds(), ast_write(), iax_park(), sip_park(), and sip_park_thread().

03404 {
03405    int x,i;
03406    int res=0;
03407    int origstate;
03408    struct ast_frame *cur;
03409    const struct ast_channel_tech *t;
03410    void *t_pvt;
03411    struct ast_callerid tmpcid;
03412    struct ast_channel *clone = original->masq;
03413    struct ast_channel_spy_list *spy_list = NULL;
03414    struct ast_channel_spy *spy = NULL;
03415    struct ast_cdr *cdr;
03416    int rformat = original->readformat;
03417    int wformat = original->writeformat;
03418    char newn[100];
03419    char orig[100];
03420    char masqn[100];
03421    char zombn[100];
03422 
03423    if (option_debug > 3)
03424       ast_log(LOG_DEBUG, "Actually Masquerading %s(%d) into the structure of %s(%d)\n",
03425          clone->name, clone->_state, original->name, original->_state);
03426 
03427    /* XXX This is a seriously wacked out operation.  We're essentially putting the guts of
03428       the clone channel into the original channel.  Start by killing off the original
03429       channel's backend.   I'm not sure we're going to keep this function, because
03430       while the features are nice, the cost is very high in terms of pure nastiness. XXX */
03431 
03432    /* We need the clone's lock, too */
03433    ast_channel_lock(clone);
03434 
03435    if (option_debug > 1)
03436       ast_log(LOG_DEBUG, "Got clone lock for masquerade on '%s' at %p\n", clone->name, &clone->lock);
03437 
03438    /* Having remembered the original read/write formats, we turn off any translation on either
03439       one */
03440    free_translation(clone);
03441    free_translation(original);
03442 
03443 
03444    /* Unlink the masquerade */
03445    original->masq = NULL;
03446    clone->masqr = NULL;
03447    
03448    /* Save the original name */
03449    ast_copy_string(orig, original->name, sizeof(orig));
03450    /* Save the new name */
03451    ast_copy_string(newn, clone->name, sizeof(newn));
03452    /* Create the masq name */
03453    snprintf(masqn, sizeof(masqn), "%s<MASQ>", newn);
03454       
03455    /* Copy the name from the clone channel */
03456    ast_string_field_set(original, name, newn);
03457 
03458    /* Mangle the name of the clone channel */
03459    ast_string_field_set(clone, name, masqn);
03460    
03461    /* Notify any managers of the change, first the masq then the other */
03462    manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", newn, masqn, clone->uniqueid);
03463    manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", orig, newn, original->uniqueid);
03464 
03465    /* Swap the technologies */   
03466    t = original->tech;
03467    original->tech = clone->tech;
03468    clone->tech = t;
03469 
03470    /* Swap the cdrs */
03471    cdr = original->cdr;
03472    original->cdr = clone->cdr;
03473    clone->cdr = cdr;
03474 
03475    t_pvt = original->tech_pvt;
03476    original->tech_pvt = clone->tech_pvt;
03477    clone->tech_pvt = t_pvt;
03478 
03479    /* Swap the readq's */
03480    cur = AST_LIST_FIRST(&original->readq);
03481    AST_LIST_HEAD_SET_NOLOCK(&original->readq, AST_LIST_FIRST(&clone->readq));
03482    AST_LIST_HEAD_SET_NOLOCK(&clone->readq, cur);
03483 
03484    /* Swap the alertpipes */
03485    for (i = 0; i < 2; i++) {
03486       x = original->alertpipe[i];
03487       original->alertpipe[i] = clone->alertpipe[i];
03488       clone->alertpipe[i] = x;
03489    }
03490 
03491    /* Swap the raw formats */
03492    x = original->rawreadformat;
03493    original->rawreadformat = clone->rawreadformat;
03494    clone->rawreadformat = x;
03495    x = original->rawwriteformat;
03496    original->rawwriteformat = clone->rawwriteformat;
03497    clone->rawwriteformat = x;
03498 
03499    /* Swap the spies */
03500    spy_list = original->spies;
03501    original->spies = clone->spies;
03502    clone->spies = spy_list;
03503 
03504    /* Update channel on respective spy lists if present */
03505    if (original->spies) {
03506       AST_LIST_TRAVERSE(&original->spies->list, spy, list) {
03507          ast_mutex_lock(&spy->lock);
03508          spy->chan = original;
03509          ast_mutex_unlock(&spy->lock);
03510       }
03511    }
03512    if (clone->spies) {
03513       AST_LIST_TRAVERSE(&clone->spies->list, spy, list) {
03514          ast_mutex_lock(&spy->lock);
03515          spy->chan = clone;
03516          ast_mutex_unlock(&spy->lock);
03517       }
03518    }
03519 
03520    /* Save any pending frames on both sides.  Start by counting
03521     * how many we're going to need... */
03522    x = 0;
03523    if (original->alertpipe[1] > -1) {
03524       AST_LIST_TRAVERSE(&clone->readq, cur, frame_list)
03525          x++;
03526    }
03527 
03528    /* If we had any, prepend them to the ones already in the queue, and 
03529     * load up the alertpipe */
03530    if (AST_LIST_FIRST(&clone->readq)) {
03531       AST_LIST_INSERT_TAIL(&clone->readq, AST_LIST_FIRST(&original->readq), frame_list);
03532       AST_LIST_HEAD_SET_NOLOCK(&original->readq, AST_LIST_FIRST(&clone->readq));
03533       AST_LIST_HEAD_SET_NOLOCK(&clone->readq, NULL);
03534       for (i = 0; i < x; i++)
03535          write(original->alertpipe[1], &x, sizeof(x));
03536    }
03537    
03538    clone->_softhangup = AST_SOFTHANGUP_DEV;
03539 
03540 
03541    /* And of course, so does our current state.  Note we need not
03542       call ast_setstate since the event manager doesn't really consider
03543       these separate.  We do this early so that the clone has the proper
03544       state of the original channel. */
03545    origstate = original->_state;
03546    original->_state = clone->_state;
03547    clone->_state = origstate;
03548 
03549    if (clone->tech->fixup){
03550       res = clone->tech->fixup(original, clone);
03551       if (res)
03552          ast_log(LOG_WARNING, "Fixup failed on channel %s, strange things may happen.\n", clone->name);
03553    }
03554 
03555    /* Start by disconnecting the original's physical side */
03556    if (clone->tech->hangup)
03557       res = clone->tech->hangup(clone);
03558    if (res) {
03559       ast_log(LOG_WARNING, "Hangup failed!  Strange things may happen!\n");
03560       ast_channel_unlock(clone);
03561       return -1;
03562    }
03563    
03564    snprintf(zombn, sizeof(zombn), "%s<ZOMBIE>", orig);
03565    /* Mangle the name of the clone channel */
03566    ast_string_field_set(clone, name, zombn);
03567    manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", masqn, zombn, clone->uniqueid);
03568 
03569    /* Update the type. */
03570    t_pvt = original->monitor;
03571    original->monitor = clone->monitor;
03572    clone->monitor = t_pvt;
03573    
03574    /* Keep the same language.  */
03575    ast_string_field_set(original, language, clone->language);
03576    /* Copy the FD's other than the generator fd */
03577    for (x = 0; x < AST_MAX_FDS; x++) {
03578       if (x != AST_GENERATOR_FD)
03579          original->fds[x] = clone->fds[x];
03580    }
03581 
03582    ast_app_group_discard(original);
03583 
03584    /* move any whisperer over */
03585    ast_channel_whisper_stop(original);
03586    if (ast_test_flag(clone, AST_FLAG_WHISPER)) {
03587       original->whisper = clone->whisper;
03588       ast_set_flag(original, AST_FLAG_WHISPER);
03589       clone->whisper = NULL;
03590       ast_clear_flag(clone, AST_FLAG_WHISPER);
03591    }
03592 
03593    /* Move data stores over */
03594    if (AST_LIST_FIRST(&clone->datastores))
03595                 AST_LIST_INSERT_TAIL(&original->datastores, AST_LIST_FIRST(&clone->datastores), entry);
03596    AST_LIST_HEAD_INIT_NOLOCK(&clone->datastores);
03597 
03598    clone_variables(original, clone);
03599    AST_LIST_HEAD_INIT_NOLOCK(&clone->varshead);
03600    /* Presense of ADSI capable CPE follows clone */
03601    original->adsicpe = clone->adsicpe;
03602    /* Bridge remains the same */
03603    /* CDR fields remain the same */
03604    /* XXX What about blocking, softhangup, blocker, and lock and blockproc? XXX */
03605    /* Application and data remain the same */
03606    /* Clone exception  becomes real one, as with fdno */
03607    ast_copy_flags(original, clone, AST_FLAG_EXCEPTION);
03608    original->fdno = clone->fdno;
03609    /* Schedule context remains the same */
03610    /* Stream stuff stays the same */
03611    /* Keep the original state.  The fixup code will need to work with it most likely */
03612 
03613    /* Just swap the whole structures, nevermind the allocations, they'll work themselves
03614       out. */
03615    tmpcid = original->cid;
03616    original->cid = clone->cid;
03617    clone->cid = tmpcid;
03618    
03619    /* Restore original timing file descriptor */
03620    original->fds[AST_TIMING_FD] = original->timingfd;
03621    
03622    /* Our native formats are different now */
03623    original->nativeformats = clone->nativeformats;
03624    
03625    /* Context, extension, priority, app data, jump table,  remain the same */
03626    /* pvt switches.  pbx stays the same, as does next */
03627    
03628    /* Set the write format */
03629    ast_set_write_format(original, wformat);
03630 
03631    /* Set the read format */
03632    ast_set_read_format(original, rformat);
03633 
03634    /* Copy the music class */
03635    ast_string_field_set(original, musicclass, clone->musicclass);
03636 
03637    if (option_debug)
03638       ast_log(LOG_DEBUG, "Putting channel %s in %d/%d formats\n", original->name, wformat, rformat);
03639 
03640    /* Okay.  Last thing is to let the channel driver know about all this mess, so he
03641       can fix up everything as best as possible */
03642    if (original->tech->fixup) {
03643       res = original->tech->fixup(clone, original);
03644       if (res) {
03645          ast_log(LOG_WARNING, "Channel for type '%s' could not fixup channel %s\n",
03646             original->tech->type, original->name);
03647          ast_channel_unlock(clone);
03648          return -1;
03649       }
03650    } else
03651       ast_log(LOG_WARNING, "Channel type '%s' does not have a fixup routine (for %s)!  Bad things may happen.\n",
03652          original->tech->type, original->name);
03653    
03654    /* Now, at this point, the "clone" channel is totally F'd up.  We mark it as
03655       a zombie so nothing tries to touch it.  If it's already been marked as a
03656       zombie, then free it now (since it already is considered invalid). */
03657    if (ast_test_flag(clone, AST_FLAG_ZOMBIE)) {
03658       if (option_debug)
03659          ast_log(LOG_DEBUG, "Destroying channel clone '%s'\n", clone->name);
03660       ast_channel_unlock(clone);
03661       manager_event(EVENT_FLAG_CALL, "Hangup",
03662          "Channel: %s\r\n"
03663          "Uniqueid: %s\r\n"
03664          "Cause: %d\r\n"
03665          "Cause-txt: %s\r\n",
03666          clone->name,
03667          clone->uniqueid,
03668          clone->hangupcause,
03669          ast_cause2str(clone->hangupcause)
03670          );
03671       ast_channel_free(clone);
03672    } else {
03673       if (option_debug)
03674          ast_log(LOG_DEBUG, "Released clone lock on '%s'\n", clone->name);
03675       ast_set_flag(clone, AST_FLAG_ZOMBIE);
03676       ast_queue_frame(clone, &ast_null_frame);
03677       ast_channel_unlock(clone);
03678    }
03679    
03680    /* Signal any blocker */
03681    if (ast_test_flag(original, AST_FLAG_BLOCKING))
03682       pthread_kill(original->blocker, SIGURG);
03683    if (option_debug)
03684       ast_log(LOG_DEBUG, "Done Masquerading %s (%d)\n", original->name, original->_state);
03685    return 0;
03686 }

static int ast_fdisset	(	struct pollfd *	pfds,
		int	fd,
		int	max,
		int *	start
	)			`[inline, static]`

Helper function for migrating select to poll.

Definition at line 1347 of file channel.h.

References pollfd::revents.

01348 {
01349    int x;
01350    int dummy=0;
01351 
01352    if (fd < 0)
01353       return 0;
01354    if (!start)
01355       start = &dummy;
01356    for (x = *start; x<max; x++)
01357       if (pfds[x].fd == fd) {
01358          if (x == *start)
01359             (*start)++;
01360          return pfds[x].revents;
01361       }
01362    return 0;
01363 }

struct ast_channel* ast_get_channel_by_exten_locked	(	const char *	exten,
		const char *	context
	)

Get channel by exten (and optionally context) and lock it.

Definition at line 1098 of file channel.c.

References channel_find_locked().

01099 {
01100    return channel_find_locked(NULL, NULL, 0, context, exten);
01101 }

struct ast_channel* ast_get_channel_by_name_locked ( const char * chan )

Get channel by name (locks channel).

Definition at line 1079 of file channel.c.

References channel_find_locked().

Referenced by action_getvar(), action_hangup(), action_redirect(), action_setcdruserfield(), action_setvar(), action_status(), action_timeout(), ast_async_goto_by_name(), asyncgoto_exec(), change_monitor_action(), do_pause_or_unpause(), get_zap_channel_locked(), handle_channelstatus(), handle_core_set_debug_channel(), handle_debugchan_deprecated(), handle_getvariablefull(), handle_hangup(), handle_nodebugchan_deprecated(), handle_showchan(), handle_showchan_deprecated(), handle_softhangup(), manager_park(), manager_play_dtmf(), pbx_builtin_importvar(), start_monitor_action(), and stop_monitor_action().

01080 {
01081    return channel_find_locked(NULL, name, 0, NULL, NULL);
01082 }

struct ast_channel* ast_get_channel_by_name_prefix_locked	(	const char *	name,
		const int	namelen
	)

Get channel by name prefix (locks channel).

Definition at line 1085 of file channel.c.

References channel_find_locked().

Referenced by ast_parse_device_state(), common_exec(), and mixmonitor_cli().

01086 {
01087    return channel_find_locked(NULL, name, namelen, NULL, NULL);
01088 }

struct ast_channel_tech* ast_get_channel_tech ( const char * name )

Get a channel technology structure by name.

Parameters:

name

name of technology to find

Returns:: a pointer to the structure, or NULL if no matching technology found

Definition at line 563 of file channel.c.

References AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), LOG_WARNING, chanlist::tech, and ast_channel_tech::type.

Referenced by ast_device_state().

00564 {
00565    struct chanlist *chanls;
00566    const struct ast_channel_tech *ret = NULL;
00567 
00568    if (AST_LIST_LOCK(&channels)) {
00569       ast_log(LOG_WARNING, "Unable to lock channel tech list\n");
00570       return NULL;
00571    }
00572 
00573    AST_LIST_TRAVERSE(&backends, chanls, list) {
00574       if (!strcasecmp(name, chanls->tech->type)) {
00575          ret = chanls->tech;
00576          break;
00577       }
00578    }
00579 
00580    AST_LIST_UNLOCK(&channels);
00581    
00582    return ret;
00583 }

ast_group_t ast_get_group ( const char * s )

Definition at line 4363 of file channel.c.

References ast_log(), ast_strdupa, group, LOG_ERROR, LOG_WARNING, and strsep().

Referenced by _parse(), build_device(), build_gateway(), build_peer(), func_channel_write(), process_zap(), and read_agent_config().

04364 {
04365    char *piece;
04366    char *c;
04367    int start=0, finish=0, x;
04368    ast_group_t group = 0;
04369 
04370    c = ast_strdupa(s);
04371    
04372    while ((piece = strsep(&c, ","))) {
04373       if (sscanf(piece, "%d-%d", &start, &finish) == 2) {
04374          /* Range */
04375       } else if (sscanf(piece, "%d", &start)) {
04376          /* Just one */
04377          finish = start;
04378       } else {
04379          ast_log(LOG_ERROR, "Syntax error parsing group configuration '%s' at '%s'. Ignoring.\n", s, piece);
04380          continue;
04381       }
04382       for (x = start; x <= finish; x++) {
04383          if ((x > 63) || (x < 0)) {
04384             ast_log(LOG_WARNING, "Ignoring invalid group %d (maximum group is 63)\n", x);
04385          } else
04386             group |= ((ast_group_t) 1 << x);
04387       }
04388    }
04389    return group;
04390 }

static int ast_get_read_format ( struct ast_channel * chan ) [inline, static]

Gets read format from channel chan.

Parameters:

chan

channel to get info Get read format for channel Returns read format

Definition at line 880 of file channel.h.

References ast_channel::readformat.

Referenced by ast_channel_formats_reset().

00881 {
00882     return chan->readformat;
00883 }

static int ast_get_write_format ( struct ast_channel * chan ) [inline, static]

Parameters:

chan

channel to get info Get write format for channel Returns write format

Definition at line 891 of file channel.h.

References ast_channel::writeformat.

Referenced by ast_channel_formats_reset().

00892 {
00893     return chan->writeformat;
00894 }

int ast_hangup ( struct ast_channel * chan )

Hang up a channel.

Note:: This function performs a hard hangup on a channel. Unlike the soft-hangup, this function performs all stream stopping, etc, on the channel that needs to end. chan is no longer valid after this call.

Parameters:

chan

channel to hang up

Returns:: Returns 0 on success, -1 on failure.

Definition at line 1664 of file channel.c.

References ast_cause2str(), ast_cdr_detach(), ast_cdr_end(), ast_channel_free(), ast_channel_lock, ast_channel_unlock, ast_closestream(), ast_do_masquerade(), AST_FLAG_BLOCKING, AST_FLAG_ZOMBIE, ast_log(), ast_set_flag, ast_test_flag, ast_channel::blocker, ast_channel::blockproc, ast_channel::cdr, CRASH, detach_spies(), EVENT_FLAG_CALL, free_translation(), ast_channel::generator, ast_channel::generatordata, ast_channel_tech::hangup, ast_channel::hangupcause, LOG_DEBUG, LOG_WARNING, manager_event(), ast_channel::masq, ast_channel::masqr, option_debug, ast_generator::release, ast_channel::sched, sched_context_destroy(), ast_channel::stream, ast_channel::tech, and ast_channel::vstream.

Referenced by __ast_request_and_dial(), __oh323_new(), agent_hangup(), agent_read(), alsa_new(), app_exec(), ast_async_goto(), ast_bridge_call_thread(), ast_dial_destroy(), ast_dial_hangup(), ast_feature_request_and_dial(), ast_iax2_new(), ast_pbx_outgoing_app(), ast_pbx_outgoing_exten(), ast_pbx_run_app(), async_wait(), begin_dial(), build_conf(), builtin_atxfer(), chanavail_exec(), check_compat(), check_goto_on_transfer(), clear_caller(), conf_free(), conf_run(), do_hang(), do_parking_thread(), features_hangup(), findmeexec(), function_ilink(), gtalk_new(), handle_frame(), handle_frame_ownerless(), handle_hd_hf(), handle_init_event(), handle_invite_replaces(), handle_offhook_message(), handle_request_invite(), handle_soft_key_event_message(), handle_stimulus_message(), hangup_chan(), hangupcalls(), hanguptree(), iax2_request(), iax_park(), iax_park_thread(), local_attended_transfer(), local_hangup(), mgcp_new(), mgcp_ss(), monitor_dial(), nbs_new(), oss_new(), park_exec(), parkandannounce_exec(), phone_new(), rpt(), rpt_call(), rpt_exec(), rpt_tele_thread(), sip_new(), sip_park(), sip_park_thread(), skinny_new(), skinny_ss(), ss_thread(), try_calling(), wait_for_answer(), wait_for_winner(), zt_handle_event(), and zt_new().

01665 {
01666    int res = 0;
01667 
01668    /* Don't actually hang up a channel that will masquerade as someone else, or
01669       if someone is going to masquerade as us */
01670    ast_channel_lock(chan);
01671 
01672    detach_spies(chan);     /* get rid of spies */
01673 
01674    if (chan->masq) {
01675       if (ast_do_masquerade(chan))
01676          ast_log(LOG_WARNING, "Failed to perform masquerade\n");
01677    }
01678 
01679    if (chan->masq) {
01680       ast_log(LOG_WARNING, "%s getting hung up, but someone is trying to masq into us?!?\n", chan->name);
01681       ast_channel_unlock(chan);
01682       return 0;
01683    }
01684    /* If this channel is one which will be masqueraded into something,
01685       mark it as a zombie already, so we know to free it later */
01686    if (chan->masqr) {
01687       ast_set_flag(chan, AST_FLAG_ZOMBIE);
01688       ast_channel_unlock(chan);
01689       return 0;
01690    }
01691    free_translation(chan);
01692    /* Close audio stream */
01693    if (chan->stream) {
01694       ast_closestream(chan->stream);
01695       chan->stream = NULL;
01696    }
01697    /* Close video stream */
01698    if (chan->vstream) {
01699       ast_closestream(chan->vstream);
01700       chan->vstream = NULL;
01701    }
01702    if (chan->sched) {
01703       sched_context_destroy(chan->sched);
01704       chan->sched = NULL;
01705    }
01706    
01707    if (chan->generatordata)   /* Clear any tone stuff remaining */
01708       chan->generator->release(chan, chan->generatordata);
01709    chan->generatordata = NULL;
01710    chan->generator = NULL;
01711    if (chan->cdr) {     /* End the CDR if it hasn't already */
01712       ast_cdr_end(chan->cdr);
01713       ast_cdr_detach(chan->cdr); /* Post and Free the CDR */
01714       chan->cdr = NULL;
01715    }
01716    if (ast_test_flag(chan, AST_FLAG_BLOCKING)) {
01717       ast_log(LOG_WARNING, "Hard hangup called by thread %ld on %s, while fd "
01718                "is blocked by thread %ld in procedure %s!  Expect a failure\n",
01719                (long)pthread_self(), chan->name, (long)chan->blocker, chan->blockproc);
01720       CRASH;
01721    }
01722    if (!ast_test_flag(chan, AST_FLAG_ZOMBIE)) {
01723       if (option_debug)
01724          ast_log(LOG_DEBUG, "Hanging up channel '%s'\n", chan->name);
01725       if (chan->tech->hangup)
01726          res = chan->tech->hangup(chan);
01727    } else {
01728       if (option_debug)
01729          ast_log(LOG_DEBUG, "Hanging up zombie '%s'\n", chan->name);
01730    }
01731          
01732    ast_channel_unlock(chan);
01733    manager_event(EVENT_FLAG_CALL, "Hangup",
01734          "Channel: %s\r\n"
01735          "Uniqueid: %s\r\n"
01736          "Cause: %d\r\n"
01737          "Cause-txt: %s\r\n",
01738          chan->name,
01739          chan->uniqueid,
01740          chan->hangupcause,
01741          ast_cause2str(chan->hangupcause)
01742          );
01743    ast_channel_free(chan);
01744    return res;
01745 }

int ast_indicate	(	struct ast_channel *	chan,
		int	condition
	)

Indicates condition of channel.

Note:: Indicate a condition such as AST_CONTROL_BUSY, AST_CONTROL_RINGING, or AST_CONTROL_CONGESTION on a channel

Parameters:

	chan	channel to change the indication
	condition	which condition to indicate on the channel

Returns:: Returns 0 on success, -1 on failure

Definition at line 2460 of file channel.c.

References ast_indicate_data().

Referenced by __ast_play_and_record(), agent_new(), ast_bridge_call(), ast_dtmf_stream(), ast_feature_request_and_dial(), attempt_transfer(), builtin_atxfer(), builtin_blindtransfer(), conf_run(), disa_exec(), do_parking_thread(), features_indicate(), finishup(), function_remote(), handle_frame(), handle_recordfile(), handle_remote_data(), handle_remote_phone_dtmf(), mgcp_ss(), monitor_dial(), park_exec(), pbx_builtin_busy(), pbx_builtin_congestion(), pbx_builtin_progress(), pbx_builtin_ringing(), pbx_builtin_waitexten(), queue_exec(), rmt_telem_finish(), rmt_telem_start(), rpt(), rpt_exec(), send_waveform_to_channel(), skinny_ss(), sla_handle_hold_event(), sla_station_exec(), sla_trunk_exec(), and wait_for_answer().

02461 {
02462    return ast_indicate_data(chan, condition, NULL, 0);
02463 }

int ast_indicate_data	(	struct ast_channel *	chan,
		int	condition,
		const void *	data,
		size_t	datalen
	)

Indicates condition of channel, with payload.

Note:: Indicate a condition such as AST_CONTROL_HOLD with payload being music on hold class

Parameters:

	chan	channel to change the indication
	condition	which condition to indicate on the channel
	data	pointer to payload data
	datalen	size of payload data

Returns:: Returns 0 on success, -1 on failure

Definition at line 2465 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_check_hangup(), AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_HOLD, AST_CONTROL_PROCEEDING, AST_CONTROL_PROGRESS, AST_CONTROL_RINGING, AST_CONTROL_UNHOLD, AST_CONTROL_VIDUPDATE, AST_FLAG_ZOMBIE, ast_get_indication_tone(), ast_log(), ast_playtones_start(), ast_playtones_stop(), ast_test_flag, tone_zone_sound::data, ast_channel_tech::indicate, LOG_DEBUG, LOG_WARNING, option_debug, ast_channel::tech, and ast_channel::zone.

Referenced by __login_exec(), agent_hangup(), ast_indicate(), ast_park_call(), bridge_native_loop(), bridge_p2p_loop(), do_parking_thread(), pbx_builtin_waitexten(), and wait_for_answer().

02466 {
02467    int res = -1;
02468 
02469    ast_channel_lock(chan);
02470    /* Stop if we're a zombie or need a soft hangup */
02471    if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
02472       ast_channel_unlock(chan);
02473       return -1;
02474    }
02475    if (chan->tech->indicate)
02476       res = chan->tech->indicate(chan, condition, data, datalen);
02477    ast_channel_unlock(chan);
02478    if (!chan->tech->indicate || res) {
02479       /*
02480        * Device does not support (that) indication, lets fake
02481        * it by doing our own tone generation. (PM2002)
02482        */
02483       if (condition < 0)
02484          ast_playtones_stop(chan);
02485       else {
02486          const struct tone_zone_sound *ts = NULL;
02487          switch (condition) {
02488          case AST_CONTROL_RINGING:
02489             ts = ast_get_indication_tone(chan->zone, "ring");
02490             break;
02491          case AST_CONTROL_BUSY:
02492             ts = ast_get_indication_tone(chan->zone, "busy");
02493             break;
02494          case AST_CONTROL_CONGESTION:
02495             ts = ast_get_indication_tone(chan->zone, "congestion");
02496             break;
02497          }
02498          if (ts && ts->data[0]) {
02499             if (option_debug)
02500                ast_log(LOG_DEBUG, "Driver for channel '%s' does not support indication %d, emulating it\n", chan->name, condition);
02501             ast_playtones_start(chan,0,ts->data, 1);
02502             res = 0;
02503          } else if (condition == AST_CONTROL_PROGRESS) {
02504             /* ast_playtones_stop(chan); */
02505          } else if (condition == AST_CONTROL_PROCEEDING) {
02506             /* Do nothing, really */
02507          } else if (condition == AST_CONTROL_HOLD) {
02508             /* Do nothing.... */
02509          } else if (condition == AST_CONTROL_UNHOLD) {
02510             /* Do nothing.... */
02511          } else if (condition == AST_CONTROL_VIDUPDATE) {
02512             /* Do nothing.... */
02513          } else {
02514             /* not handled */
02515             ast_log(LOG_WARNING, "Unable to handle indication %d for '%s'\n", condition, chan->name);
02516             res = -1;
02517          }
02518       }
02519    }
02520    return res;
02521 }

int ast_internal_timing_enabled ( struct ast_channel * chan )

Check if the channel can run in internal timing mode.

Parameters:

chan

The channel to check

Returns:: boolean

This function will return 1 if internal timing is enabled and the timing device is available.

Definition at line 2442 of file channel.c.

References ast_log(), ast_opt_internal_timing, LOG_DEBUG, option_debug, and ast_channel::timingfd.

Referenced by __ast_read(), and add_sdp().

02443 {
02444    int ret = ast_opt_internal_timing && chan->timingfd > -1;
02445    if (option_debug > 4)
02446       ast_log(LOG_DEBUG, "Internal timing is %s (option_internal_timing=%d chan->timingfd=%d)\n", ret? "enabled": "disabled", ast_opt_internal_timing, chan->timingfd);
02447    return ret;
02448 }

char* ast_print_group	(	char *	buf,
		int	buflen,
		ast_group_t	group
	)

print call- and pickup groups into buffer

Definition at line 4445 of file channel.c.

Referenced by _sip_show_peer(), func_channel_read(), misdn_cfg_get_config_string(), print_group(), read_config(), and serialize_showchan().

04446 {
04447    unsigned int i;
04448    int first=1;
04449    char num[3];
04450 
04451    buf[0] = '\0';
04452    
04453    if (!group) /* Return empty string if no group */
04454       return buf;
04455 
04456    for (i = 0; i <= 63; i++) {   /* Max group is 63 */
04457       if (group & ((ast_group_t) 1 << i)) {
04458             if (!first) {
04459             strncat(buf, ", ", buflen);
04460          } else {
04461             first=0;
04462          }
04463          snprintf(num, sizeof(num), "%u", i);
04464          strncat(buf, num, buflen);
04465       }
04466    }
04467    return buf;
04468 }

int ast_prod ( struct ast_channel * chan )

Send empty audio to prime a channel driver.

Definition at line 2644 of file channel.c.

References ast_channel::_state, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), AST_STATE_UP, ast_write(), ast_frame::data, LOG_DEBUG, LOG_WARNING, option_debug, ast_channel::rawwriteformat, ast_frame::src, and ast_frame::subclass.

Referenced by ast_activate_generator().

02645 {
02646    struct ast_frame a = { AST_FRAME_VOICE };
02647    char nothing[128];
02648 
02649    /* Send an empty audio frame to get things moving */
02650    if (chan->_state != AST_STATE_UP) {
02651       if (option_debug)
02652          ast_log(LOG_DEBUG, "Prodding channel '%s'\n", chan->name);
02653       a.subclass = chan->rawwriteformat;
02654       a.data = nothing + AST_FRIENDLY_OFFSET;
02655       a.src = "ast_prod";
02656       if (ast_write(chan, &a))
02657          ast_log(LOG_WARNING, "Prodding channel '%s' failed\n", chan->name);
02658    }
02659    return 0;
02660 }

int ast_queue_control	(	struct ast_channel *	chan,
		enum ast_control_frame_type	control
	)

Queue a control frame with payload.

Parameters:

	chan	channel to queue frame onto
	control	type of control frame

Returns:: zero on success, non-zero on failure

Definition at line 948 of file channel.c.

References AST_FRAME_CONTROL, ast_queue_frame(), and f.

Referenced by __oh323_update_info(), __zt_exception(), ast_pickup_call(), attempt_transfer(), auto_congest(), gtalk_is_answered(), gtalk_ringing_ack(), handle_hd_hf(), handle_offhook_message(), handle_request(), handle_request_bye(), handle_request_info(), handle_request_refer(), handle_response(), handle_response_invite(), handle_response_refer(), handle_soft_key_event_message(), handle_stimulus_message(), mgcp_call(), nbs_call(), phone_call(), pickup_do(), process_sdp(), receive_digit(), send_cause2ast(), setup_rtp_connection(), skinny_call(), skinny_unhold(), socket_process(), ss_thread(), update_state(), zt_handle_event(), and zt_hangup().

00949 {
00950    struct ast_frame f = { AST_FRAME_CONTROL, };
00951 
00952    f.subclass = control;
00953 
00954    return ast_queue_frame(chan, &f);
00955 }

int ast_queue_control_data	(	struct ast_channel *	chan,
		enum ast_control_frame_type	control,
		const void *	data,
		size_t	datalen
	)

Queue a control frame with payload.

Parameters:

	chan	channel to queue frame onto
	control	type of control frame
	data	pointer to payload data to be included in frame
	datalen	number of bytes of payload data

Returns:: zero on success, non-zero on failure

The supplied payload data is copied into the frame, so the caller's copy is not modified nor freed, and the resulting frame will retain a copy of the data even if the caller frees their local copy.

Note:: This method should be treated as a 'network transport'; in other words, your frames may be transferred across an IAX2 channel to another system, which may be a different endianness than yours. Because of this, you should ensure that either your frames will never be expected to work across systems, or that you always put your payload data into 'network byte order' before calling this function.

Definition at line 958 of file channel.c.

References AST_FRAME_CONTROL, ast_queue_frame(), and f.

Referenced by process_sdp(), skinny_hold(), socket_process(), zt_handle_event(), and zt_hangup().

00960 {
00961    struct ast_frame f = { AST_FRAME_CONTROL, };
00962 
00963    f.subclass = control;
00964    f.data = (void *) data;
00965    f.datalen = datalen;
00966 
00967    return ast_queue_frame(chan, &f);
00968 }

int ast_queue_frame	(	struct ast_channel *	chan,
		struct ast_frame *	f
	)

Queue an outgoing frame.

Definition at line 880 of file channel.c.

References ast_channel::alertpipe, ast_channel_lock, ast_channel_unlock, AST_CONTROL_HANGUP, AST_FLAG_BLOCKING, AST_FRAME_CONTROL, AST_FRAME_VOICE, ast_frdup(), ast_frfree(), AST_LIST_INSERT_TAIL, AST_LIST_LAST, AST_LIST_TRAVERSE, ast_log(), ast_test_flag, ast_channel::blocker, CRASH, f, ast_frame::frametype, LOG_DEBUG, LOG_WARNING, option_debug, ast_frame::subclass, and ast_channel::timingfd.

Referenced by __oh323_rtp_create(), __oh323_update_info(), agent_new(), alsa_call(), ast_channel_masquerade(), ast_channel_setwhentohangup(), ast_dsp_process(), ast_queue_control(), ast_queue_control_data(), ast_queue_hangup(), ast_softhangup_nolock(), cb_events(), console_answer(), console_answer_deprecated(), console_dial(), console_dial_deprecated(), console_flash(), console_flash_deprecated(), console_sendtext(), console_sendtext_deprecated(), dictate_exec(), do_immediate_setup(), gtalk_handle_dtmf(), handle_keypad_button_message(), handle_request_info(), handle_request_invite(), handle_response_invite(), iax2_queue_frame(), local_queue_frame(), mgcp_queue_frame(), oh323_simulate_dtmf_end(), oss_call(), process_sdp(), receive_digit(), receive_message(), wakeup_sub(), and zap_queue_frame().

00881 {
00882    struct ast_frame *f;
00883    struct ast_frame *cur;
00884    int blah = 1;
00885    int qlen = 0;
00886 
00887    /* Build us a copy and free the original one */
00888    if (!(f = ast_frdup(fin))) {
00889       ast_log(LOG_WARNING, "Unable to duplicate frame\n");
00890       return -1;
00891    }
00892    ast_channel_lock(chan);
00893 
00894    /* See if the last frame on the queue is a hangup, if so don't queue anything */
00895    if ((cur = AST_LIST_LAST(&chan->readq)) && (cur->frametype == AST_FRAME_CONTROL) && (cur->subclass == AST_CONTROL_HANGUP)) {
00896       ast_frfree(f);
00897       ast_channel_unlock(chan);
00898       return 0;
00899    }
00900 
00901    /* Count how many frames exist on the queue */
00902    AST_LIST_TRAVERSE(&chan->readq, cur, frame_list) {
00903       qlen++;
00904    }
00905 
00906    /* Allow up to 96 voice frames outstanding, and up to 128 total frames */
00907    if (((fin->frametype == AST_FRAME_VOICE) && (qlen > 96)) || (qlen  > 128)) {
00908       if (fin->frametype != AST_FRAME_VOICE) {
00909          ast_log(LOG_WARNING, "Exceptionally long queue length queuing to %s\n", chan->name);
00910          CRASH;
00911       } else {
00912          if (option_debug)
00913             ast_log(LOG_DEBUG, "Dropping voice to exceptionally long queue on %s\n", chan->name);
00914          ast_frfree(f);
00915          ast_channel_unlock(chan);
00916          return 0;
00917       }
00918    }
00919    AST_LIST_INSERT_TAIL(&chan->readq, f, frame_list);
00920    if (chan->alertpipe[1] > -1) {
00921       if (write(chan->alertpipe[1], &blah, sizeof(blah)) != sizeof(blah))
00922          ast_log(LOG_WARNING, "Unable to write to alert pipe on %s, frametype/subclass %d/%d (qlen = %d): %s!\n",
00923             chan->name, f->frametype, f->subclass, qlen, strerror(errno));
00924 #ifdef HAVE_ZAPTEL
00925    } else if (chan->timingfd > -1) {
00926       ioctl(chan->timingfd, ZT_TIMERPING, &blah);
00927 #endif            
00928    } else if (ast_test_flag(chan, AST_FLAG_BLOCKING)) {
00929       pthread_kill(chan->blocker, SIGURG);
00930    }
00931    ast_channel_unlock(chan);
00932    return 0;
00933 }

int ast_queue_hangup ( struct ast_channel * chan )

Queue a hangup frame.

Definition at line 936 of file channel.c.

References ast_channel::_softhangup, ast_channel_trylock, ast_channel_unlock, AST_CONTROL_HANGUP, AST_FRAME_CONTROL, ast_queue_frame(), AST_SOFTHANGUP_DEV, and f.

Referenced by __oh323_update_info(), __sip_autodestruct(), cleanup_connection(), console_hangup(), console_hangup_deprecated(), gtalk_hangup_farend(), handle_onhook_message(), handle_request_bye(), handle_request_cancel(), handle_response(), handle_response_invite(), handle_soft_key_event_message(), hangup_chan(), hangup_connection(), iax2_destroy(), iax2_predestroy(), mgcp_queue_hangup(), misdn_answer(), retrans_pkt(), and zt_handle_event().

00937 {
00938    struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_HANGUP };
00939    /* Yeah, let's not change a lock-critical value without locking */
00940    if (!ast_channel_trylock(chan)) {
00941       chan->_softhangup |= AST_SOFTHANGUP_DEV;
00942       ast_channel_unlock(chan);
00943    }
00944    return ast_queue_frame(chan, &f);
00945 }

struct ast_frame* ast_read ( struct ast_channel * chan )

Reads a frame.

Parameters:

chan

channel to read a frame from

Returns:: Returns a frame, or NULL on error. If it returns NULL, you best just stop reading frames and assume the channel has been disconnected.

Definition at line 2450 of file channel.c.

References __ast_read().

Referenced by __adsi_transmit_messages(), __ast_play_and_record(), __ast_request_and_dial(), adsi_careful_send(), agent_ack_sleep(), agent_read(), app_exec(), ast_feature_request_and_dial(), ast_masq_park_call(), ast_recvtext(), ast_safe_sleep_conditional(), ast_tonepair(), ast_udptl_bridge(), ast_waitfordigit_full(), async_wait(), autoservice_run(), background_detect_exec(), bridge_native_loop(), bridge_p2p_loop(), builtin_atxfer(), channel_spy(), check_goto_on_transfer(), conf_exec(), conf_flush(), conf_run(), dictate_exec(), disa_exec(), do_parking_thread(), do_waiting(), echo_exec(), features_read(), find_cache(), handle_invite_replaces(), handle_recordfile(), iax_park_thread(), ices_exec(), isAnsweringMachine(), measurenoise(), misdn_bridge(), monitor_dial(), mp3_exec(), mwanalyze_exec(), NBScat_exec(), nv_background_detect_exec(), nv_detectfax_exec(), receive_dtmf_digits(), recordthread(), rpt(), run_agi(), rxfax_exec(), send_tone_burst(), send_waveform_to_channel(), sendurl_exec(), speech_background(), ss_thread(), txfax_exec(), wait_for_answer(), wait_for_hangup(), wait_for_winner(), waitforring_exec(), waitstream_core(), and zt_bridge().

02451 {
02452    return __ast_read(chan, 0);
02453 }

struct ast_frame* ast_read_noaudio ( struct ast_channel * chan )

Reads a frame, returning AST_FRAME_NULL frame if audio.

Parameters:

chan

channel to read a frame from

Returns:: Returns a frame, or NULL on error. If it returns NULL, you best just stop reading frames and assume the channel has been disconnected.

Note:: Audio is replaced with AST_FRAME_NULL to avoid transcode when the resulting audio is not necessary.

Definition at line 2455 of file channel.c.

References __ast_read().

Referenced by conf_run().

02456 {
02457    return __ast_read(chan, 1);
02458 }

int ast_readstring	(	struct ast_channel *	c,
		char *	s,
		int	len,
		int	timeout,
		int	rtimeout,
		char *	enders
	)

Reads multiple digits

Parameters:

	c	channel to read from
	s	string to read in to. Must be at least the size of your length
	len	how many digits to read (maximum)
	timeout	how long to timeout between digits
	rtimeout	timeout to wait on the first digit
	enders	digits to end the string Read in a digit string "s", max length "len", maximum timeout between digits "timeout" (-1 for none), terminated by anything in "enders". Give them rtimeout for the first digit. Returns 0 on normal return, or 1 on a timeout. In the case of a timeout, any digits that were read before the timeout will still be available in s. RETURNS 2 in full version when ctrlfd is available, NOT 1

Definition at line 3147 of file channel.c.

References ast_readstring_full().

Referenced by __adsi_transmit_messages(), ast_adsi_begin_download(), ast_adsi_get_cpeinfo(), ast_adsi_load_session(), ast_app_getdata(), dialout(), do_directory(), forward_message(), privacy_exec(), vm_authenticate(), vm_newuser(), and vm_options().

03148 {
03149    return ast_readstring_full(c, s, len, timeout, ftimeout, enders, -1, -1);
03150 }

int ast_readstring_full	(	struct ast_channel *	c,
		char *	s,
		int	len,
		int	timeout,
		int	rtimeout,
		char *	enders,
		int	audiofd,
		int	ctrlfd
	)

Definition at line 3152 of file channel.c.

References ast_check_hangup(), AST_DIGIT_ANY, AST_FLAG_ZOMBIE, ast_stopstream(), ast_test_flag, ast_waitfordigit_full(), ast_waitstream_full(), and ast_channel::stream.

Referenced by ast_app_getdata_full(), and ast_readstring().

03153 {
03154    int pos = 0;   /* index in the buffer where we accumulate digits */
03155    int to = ftimeout;
03156 
03157    /* Stop if we're a zombie or need a soft hangup */
03158    if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
03159       return -1;
03160    if (!len)
03161       return -1;
03162    for (;;) {
03163       int d;
03164       if (c->stream) {
03165          d = ast_waitstream_full(c, AST_DIGIT_ANY, audiofd, ctrlfd);
03166          ast_stopstream(c);
03167          usleep(1000);
03168          if (!d)
03169             d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
03170       } else {
03171          d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
03172       }
03173       if (d < 0)
03174          return -1;
03175       if (d == 0) {
03176          s[pos]='\0';
03177          return 1;
03178       }
03179       if (d == 1) {
03180          s[pos]='\0';
03181          return 2;
03182       }
03183       if (!strchr(enders, d))
03184          s[pos++] = d;
03185       if (strchr(enders, d) || (pos >= len)) {
03186          s[pos]='\0';
03187          return 0;
03188       }
03189       to = timeout;
03190    }
03191    /* Never reached */
03192    return 0;
03193 }

int ast_recvchar	(	struct ast_channel *	chan,
		int	timeout
	)

Receives a text character from a channel.

Parameters:

	chan	channel to act upon
	timeout	timeout in milliseconds (0 for infinite wait) Read a char of text from a channel Returns 0 on success, -1 on failure

Definition at line 2523 of file channel.c.

References ast_recvtext(), and free.

Referenced by handle_recvchar().

02524 {
02525    int c;
02526    char *buf = ast_recvtext(chan, timeout);
02527    if (buf == NULL)
02528       return -1;  /* error or timeout */
02529    c = *(unsigned char *)buf;
02530    free(buf);
02531    return c;
02532 }

char* ast_recvtext	(	struct ast_channel *	chan,
		int	timeout
	)

Receives a text string from a channel Read a string of text from a channel.

Parameters:

	chan	channel to act upon
	timeout	timeout in milliseconds (0 for infinite wait)

Returns:: the received text, or NULL to signify failure.

Definition at line 2534 of file channel.c.

References ast_check_hangup(), AST_CONTROL_HANGUP, AST_FRAME_CONTROL, AST_FRAME_TEXT, ast_frfree(), ast_read(), ast_strndup, ast_waitfor(), and f.

Referenced by ast_recvchar(), and handle_recvtext().

02535 {
02536    int res, done = 0;
02537    char *buf = NULL;
02538    
02539    while (!done) {
02540       struct ast_frame *f;
02541       if (ast_check_hangup(chan))
02542          break;
02543       res = ast_waitfor(chan, timeout);
02544       if (res <= 0) /* timeout or error */
02545          break;
02546       timeout = res; /* update timeout */
02547       f = ast_read(chan);
02548       if (f == NULL)
02549          break; /* no frame */
02550       if (f->frametype == AST_FRAME_CONTROL && f->subclass == AST_CONTROL_HANGUP)
02551          done = 1;   /* force a break */
02552       else if (f->frametype == AST_FRAME_TEXT) {      /* what we want */
02553          buf = ast_strndup((char *) f->data, f->datalen);   /* dup and break */
02554          done = 1;
02555       }
02556       ast_frfree(f);
02557    }
02558    return buf;
02559 }

struct ast_channel* ast_request	(	const char *	type,
		int	format,
		void *	data,
		int *	status
	)

Requests a channel.

Parameters:

	type	type of channel to request
	format	requested channel format (codec)
	data	data to pass to the channel requester
	status	status Request a channel of a given type, with data as optional information used by the low level module

Returns:: Returns an ast_channel on success, NULL on failure.

Definition at line 3056 of file channel.c.

References AST_CAUSE_NOSUCHDRIVER, AST_CAUSE_NOTDEFINED, AST_FORMAT_AUDIO_MASK, AST_FORMAT_VIDEO_MASK, AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_translator_best_choice(), ast_channel_tech::capabilities, capabilities, fmt, LOG_WARNING, ast_channel_tech::requester, chanlist::tech, and ast_channel_tech::type.

Referenced by __ast_request_and_dial(), agent_request(), ast_feature_request_and_dial(), ast_request_inherit(), attempt_reconnect(), begin_dial(), build_conf(), chanavail_exec(), conf_run(), features_alloc(), findmeexec(), function_ilink(), ring_entry(), rpt(), rpt_call(), rpt_exec(), rpt_tele_thread(), and wait_for_answer().

03057 {
03058    struct chanlist *chan;
03059    struct ast_channel *c;
03060    int capabilities;
03061    int fmt;
03062    int res;
03063    int foo;
03064    int videoformat = format & AST_FORMAT_VIDEO_MASK;
03065 
03066    if (!cause)
03067       cause = &foo;
03068    *cause = AST_CAUSE_NOTDEFINED;
03069 
03070    if (AST_LIST_LOCK(&channels)) {
03071       ast_log(LOG_WARNING, "Unable to lock channel list\n");
03072       return NULL;
03073    }
03074 
03075    AST_LIST_TRAVERSE(&backends, chan, list) {
03076       if (strcasecmp(type, chan->tech->type))
03077          continue;
03078 
03079       capabilities = chan->tech->capabilities;
03080       fmt = format & AST_FORMAT_AUDIO_MASK;
03081       res = ast_translator_best_choice(&fmt, &capabilities);
03082       if (res < 0) {
03083          ast_log(LOG_WARNING, "No translator path exists for channel type %s (native %d) to %d\n", type, chan->tech->capabilities, format);
03084          AST_LIST_UNLOCK(&channels);
03085          return NULL;
03086       }
03087       AST_LIST_UNLOCK(&channels);
03088       if (!chan->tech->requester)
03089          return NULL;
03090       
03091       if (!(c = chan->tech->requester(type, capabilities | videoformat, data, cause)))
03092          return NULL;
03093 
03094       /* no need to generate a Newchannel event here; it is done in the channel_alloc call */
03095       return c;
03096    }
03097 
03098    ast_log(LOG_WARNING, "No channel type registered for '%s'\n", type);
03099    *cause = AST_CAUSE_NOSUCHDRIVER;
03100    AST_LIST_UNLOCK(&channels);
03101 
03102    return NULL;
03103 }

struct ast_channel* ast_request_and_dial	(	const char *	type,
		int	format,
		void *	data,
		int	timeout,
		int *	reason,
		const char *	cidnum,
		const char *	cidname
	)

Request a channel of a given type, with data as optional information used by the low level module and attempt to place a call on it.

Parameters:

	type	type of channel to request
	format	requested channel format
	data	data to pass to the channel requester
	timeout	maximum amount of time to wait for an answer
	reason	why unsuccessful (if unsuceessful)
	cidnum	Caller-ID Number
	cidname	Caller-ID Name

Returns:: Returns an ast_channel on success or no answer, NULL on failure. Check the value of chan->_state to know if the call was answered or not.

Definition at line 3051 of file channel.c.

References __ast_request_and_dial().

Referenced by ast_pbx_outgoing_exten().

03052 {
03053    return __ast_request_and_dial(type, format, data, timeout, outstate, cidnum, cidname, NULL);
03054 }

static struct ast_channel* ast_request_inherit	(	struct ast_channel *	chan,
		const char *	type,
		void *	data,
		int *	status
	)			`[inline, static]`

call ast_request with format/type of parent channel

Definition at line 650 of file channel.h.

References ast_request(), ast_channel::nativeformats, S_OR, ast_channel::tech, and ast_channel_tech::type.

00651 {
00652    return ast_request(S_OR(type, chan->tech->type), chan->nativeformats, data, status);
00653 }

int ast_safe_sleep	(	struct ast_channel *	chan,
		int	ms
	)

Wait for a specied amount of time, looking for hangups.

Parameters:

	chan	channel to wait for
	ms	length of time in milliseconds to sleep Waits for a specified amount of time, servicing the channel as required.

Returns:: returns -1 on hangup, otherwise 0.

Definition at line 1132 of file channel.c.

References ast_safe_sleep_conditional().

Referenced by __login_exec(), alarmreceiver_exec(), ast_adsi_transmit_message_full(), ast_dtmf_stream(), ast_senddigit(), builtin_parkcall(), dictate_exec(), flash_exec(), function_ilink(), function_remote(), handle_remote_data(), handle_remote_phone_dtmf(), milliwatt_exec(), moh0_exec(), moh1_exec(), park_call_exec(), pbx_builtin_answer(), pbx_builtin_wait(), play_tone_pair(), playtone(), privacy_exec(), receive_ademco_contact_id(), rmt_telem_start(), rpt_call(), rpt_exec(), rpt_tele_thread(), send_morse(), send_tone_telemetry(), skinny_ss(), ss_thread(), test1_client(), test1_server(), testclient_exec(), testserver_exec(), try_calling(), wait_for_hangup(), wait_interval(), and zapateller_exec().

01133 {
01134    return ast_safe_sleep_conditional(chan, ms, NULL, NULL);
01135 }

int ast_safe_sleep_conditional	(	struct ast_channel *	chan,
		int	ms,
		int()(void )	cond,
		void *	data
	)

Wait for a specied amount of time, looking for hangups and a condition argument.

Parameters:

	chan	channel to wait for
	ms	length of time in milliseconds to sleep
	cond	a function pointer for testing continue condition
	data	argument to be passed to the condition test function

Returns:: returns -1 on hangup, otherwise 0. Waits for a specified amount of time, servicing the channel as required. If cond returns 0, this function returns.

Definition at line 1111 of file channel.c.

References ast_frfree(), ast_read(), ast_waitfor(), and f.

Referenced by __login_exec(), and ast_safe_sleep().

01112 {
01113    struct ast_frame *f;
01114 
01115    while (ms > 0) {
01116       if (cond && ((*cond)(data) == 0))
01117          return 0;
01118       ms = ast_waitfor(chan, ms);
01119       if (ms < 0)
01120          return -1;
01121       if (ms > 0) {
01122          f = ast_read(chan);
01123          if (!f)
01124             return -1;
01125          ast_frfree(f);
01126       }
01127    }
01128    return 0;
01129 }

char* ast_safe_string_alloc	(	const char *	fmt,
			...
	)

printf the string into a correctly sized mallocd buffer, and return the buffer

return a mallocd string with the result of sprintf of the fmt and following args

Definition at line 426 of file channel.c.

References ast_malloc, and len.

Referenced by features_new().

00427 {
00428    char *b2,buf[1];
00429    int len;
00430 
00431    va_list args;
00432    va_start(args, fmt);
00433    len = vsnprintf(buf, 1, fmt, args);
00434    b2 = ast_malloc(len+1);
00435    vsnprintf(b2, len+1,  fmt, args);
00436    va_end(args);
00437    return b2;
00438 }

static int ast_select	(	int	nfds,
		fd_set *	rfds,
		fd_set *	wfds,
		fd_set *	efds,
		struct timeval *	tvp
	)			`[inline, static]`

Waits for activity on a group of channels.

Parameters:

	nfds	the maximum number of file descriptors in the sets
	rfds	file descriptors to check for read availability
	wfds	file descriptors to check for write availability
	efds	file descriptors to check for exceptions (OOB data)
	tvp	timeout while waiting for events This is the same as a standard select(), except it guarantees the behaviour where the passed struct timeval is updated with how much time was not slept while waiting for the specified events

Definition at line 1388 of file channel.h.

Referenced by do_monitor(), do_parking_thread(), and sound_thread().

01389 {
01390 #ifdef __linux__
01391    return select(nfds, rfds, wfds, efds, tvp);
01392 #else
01393    if (tvp) {
01394       struct timeval tv, tvstart, tvend, tvlen;
01395       int res;
01396 
01397       tv = *tvp;
01398       gettimeofday(&tvstart, NULL);
01399       res = select(nfds, rfds, wfds, efds, tvp);
01400       gettimeofday(&tvend, NULL);
01401       timersub(&tvend, &tvstart, &tvlen);
01402       timersub(&tv, &tvlen, tvp);
01403       if (tvp->tv_sec < 0 || (tvp->tv_sec == 0 && tvp->tv_usec < 0)) {
01404          tvp->tv_sec = 0;
01405          tvp->tv_usec = 0;
01406       }
01407       return res;
01408    }
01409    else
01410       return select(nfds, rfds, wfds, efds, NULL);
01411 #endif
01412 }

int ast_senddigit	(	struct ast_channel *	chan,
		char	digit
	)

Send a DTMF digit to a channel Send a DTMF digit to a channel.

Parameters:

	chan	channel to act upon
	digit	the DTMF digit to send, encoded in ASCII

Returns:: Returns 0 on success, -1 on failure

Definition at line 2634 of file channel.c.

References AST_FLAG_END_DTMF_ONLY, ast_safe_sleep(), ast_senddigit_begin(), ast_senddigit_end(), and ast_test_flag.

Referenced by ast_dtmf_stream(), and manager_play_dtmf().

02635 {
02636    if (!ast_test_flag(chan, AST_FLAG_END_DTMF_ONLY)) {
02637       ast_senddigit_begin(chan, digit);
02638       ast_safe_sleep(chan, 100); /* XXX 100ms ... probably should be configurable */
02639    }
02640    
02641    return ast_senddigit_end(chan, digit, 100);
02642 }

int ast_senddigit_begin	(	struct ast_channel *	chan,
		char	digit
	)

Send a DTMF digit to a channel Send a DTMF digit to a channel.

Parameters:

	chan	channel to act upon
	digit	the DTMF digit to send, encoded in ASCII

Returns:: Returns 0 on success, -1 on failure

Definition at line 2574 of file channel.c.

References ast_log(), ast_playtones_start(), LOG_DEBUG, option_debug, ast_channel_tech::send_digit_begin, and ast_channel::tech.

Referenced by agent_digit_begin(), ast_senddigit(), ast_write(), and features_digit_begin().

02575 {
02576    int res = -1;
02577 
02578    if (chan->tech->send_digit_begin)
02579       res = chan->tech->send_digit_begin(chan, digit);
02580 
02581    if (res) {
02582       /*
02583        * Device does not support DTMF tones, lets fake
02584        * it by doing our own generation. (PM2002)
02585        */
02586       static const char* dtmf_tones[] = {
02587          "!941+1336/100,!0/100", /* 0 */
02588          "!697+1209/100,!0/100", /* 1 */
02589          "!697+1336/100,!0/100", /* 2 */
02590          "!697+1477/100,!0/100", /* 3 */
02591          "!770+1209/100,!0/100", /* 4 */
02592          "!770+1336/100,!0/100", /* 5 */
02593          "!770+1477/100,!0/100", /* 6 */
02594          "!852+1209/100,!0/100", /* 7 */
02595          "!852+1336/100,!0/100", /* 8 */
02596          "!852+1477/100,!0/100", /* 9 */
02597          "!697+1633/100,!0/100", /* A */
02598          "!770+1633/100,!0/100", /* B */
02599          "!852+1633/100,!0/100", /* C */
02600          "!941+1633/100,!0/100", /* D */
02601          "!941+1209/100,!0/100", /* * */
02602          "!941+1477/100,!0/100" };  /* # */
02603       if (digit >= '0' && digit <='9')
02604          ast_playtones_start(chan, 0, dtmf_tones[digit-'0'], 0);
02605       else if (digit >= 'A' && digit <= 'D')
02606          ast_playtones_start(chan, 0, dtmf_tones[digit-'A'+10], 0);
02607       else if (digit == '*')
02608          ast_playtones_start(chan, 0, dtmf_tones[14], 0);
02609       else if (digit == '#')
02610          ast_playtones_start(chan, 0, dtmf_tones[15], 0);
02611       else {
02612          /* not handled */
02613          if (option_debug)
02614             ast_log(LOG_DEBUG, "Unable to generate DTMF tone '%c' for '%s'\n", digit, chan->name);
02615       }
02616    }
02617 
02618    return 0;
02619 }

int ast_senddigit_end	(	struct ast_channel *	chan,
		char	digit,
		unsigned int	duration
	)

Send a DTMF digit to a channel.

Parameters:

	chan	channel to act upon
	digit	the DTMF digit to send, encoded in ASCII

Returns:: Returns 0 on success, -1 on failure

Definition at line 2621 of file channel.c.

References ast_playtones_stop(), ast_channel::generator, ast_channel_tech::send_digit_end, and ast_channel::tech.

Referenced by agent_digit_end(), ast_senddigit(), ast_write(), and features_digit_end().

02622 {
02623    int res = -1;
02624 
02625    if (chan->tech->send_digit_end)
02626       res = chan->tech->send_digit_end(chan, digit, duration);
02627 
02628    if (res && chan->generator)
02629       ast_playtones_stop(chan);
02630    
02631    return 0;
02632 }

int ast_sendtext	(	struct ast_channel *	chan,
		const char *	text
	)

Sends text to a channel Write text to a display on a channel.

Parameters:

	chan	channel to act upon
	text	string of text to send on the channel

Returns:: Returns 0 on success, -1 on failure

Definition at line 2561 of file channel.c.

References ast_check_hangup(), ast_clear_flag, AST_FLAG_BLOCKING, AST_FLAG_ZOMBIE, ast_test_flag, CHECK_BLOCKING, ast_channel_tech::send_text, and ast_channel::tech.

Referenced by agent_sendtext(), handle_sendtext(), and sendtext_exec().

02562 {
02563    int res = 0;
02564    /* Stop if we're a zombie or need a soft hangup */
02565    if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))
02566       return -1;
02567    CHECK_BLOCKING(chan);
02568    if (chan->tech->send_text)
02569       res = chan->tech->send_text(chan, text);
02570    ast_clear_flag(chan, AST_FLAG_BLOCKING);
02571    return res;
02572 }

static void ast_set_best_format ( struct ast_channel * channel ) [inline, static]

Set best format, identical to read/write.

Parameters:

channel

channel, from that nativeformats used and formats set

Definition at line 1155 of file channel.h.

References ast_channel_best_codec(), ast_set_read_format(), and ast_set_write_format().

01156 {
01157     int format = ast_channel_best_codec(channel);
01158     ast_set_read_format(channel, format);
01159     ast_set_write_format(channel, format);
01160 }

void ast_set_callerid	(	struct ast_channel *	chan,
		const char *	cidnum,
		const char *	cidname,
		const char *	ani
	)

Definition at line 3688 of file channel.c.

References ast_cdr_setcid(), ast_describe_caller_presentation(), ast_strdup, ast_channel::cdr, ast_channel::cid, ast_callerid::cid_ani, ast_callerid::cid_name, ast_callerid::cid_num, ast_callerid::cid_pres, EVENT_FLAG_CALL, free, manager_event(), and S_OR.

Referenced by __ast_request_and_dial(), agent_call(), ast_feature_request_and_dial(), callerid_write(), disa_exec(), findmeexec(), handle_setcallerid(), lookupcidname_exec(), mgcp_ss(), privacy_exec(), read_config(), rpt_exec(), setcallerid_exec(), skinny_newcall(), ss_thread(), wait_for_answer(), and zt_read().

03689 {
03690    if (callerid) {
03691       if (chan->cid.cid_num)
03692          free(chan->cid.cid_num);
03693       chan->cid.cid_num = ast_strdup(callerid);
03694    }
03695    if (calleridname) {
03696       if (chan->cid.cid_name)
03697          free(chan->cid.cid_name);
03698       chan->cid.cid_name = ast_strdup(calleridname);
03699    }
03700    if (ani) {
03701       if (chan->cid.cid_ani)
03702          free(chan->cid.cid_ani);
03703       chan->cid.cid_ani = ast_strdup(ani);
03704    }
03705    if (chan->cdr)
03706       ast_cdr_setcid(chan->cdr, chan);
03707    manager_event(EVENT_FLAG_CALL, "Newcallerid",
03708             "Channel: %s\r\n"
03709             "CallerID: %s\r\n"
03710             "CallerIDName: %s\r\n"
03711             "Uniqueid: %s\r\n"
03712             "CID-CallingPres: %d (%s)\r\n",
03713             chan->name,
03714             S_OR(chan->cid.cid_num, "<Unknown>"),
03715             S_OR(chan->cid.cid_name, "<Unknown>"),
03716             chan->uniqueid,
03717             chan->cid.cid_pres,
03718             ast_describe_caller_presentation(chan->cid.cid_pres)
03719             );
03720 }

int ast_set_read_format	(	struct ast_channel *	chan,
		int	format
	)

Sets read format on channel chan Set read format for channel to whichever component of "format" is best.

Parameters:

	chan	channel to change
	format	format to change to

Returns:: Returns 0 on success, -1 on failure

Definition at line 2915 of file channel.c.

References ast_channel::rawreadformat, ast_channel::readformat, ast_channel::readtrans, and set_format().

Referenced by __ast_play_and_record(), __login_exec(), __oh323_update_info(), agent_call(), alarmreceiver_exec(), ast_adsi_transmit_message_full(), ast_channel_formats_reset(), ast_channel_make_compatible(), ast_set_best_format(), attempt_reconnect(), background_detect_exec(), build_conf(), conf_run(), dictate_exec(), disa_exec(), do_waiting(), eagi_exec(), echo_exec(), function_ilink(), gtalk_rtp_read(), handle_recordfile(), ices_exec(), isAnsweringMachine(), measurenoise(), mgcp_rtp_read(), milliwatt_exec(), mwanalyze_exec(), nv_background_detect_exec(), nv_detectfax_exec(), oh323_rtp_read(), process_sdp(), rpt(), rpt_exec(), rxfax_exec(), setup_rtp_connection(), sip_rtp_read(), skinny_rtp_read(), socket_process(), speech_background(), txfax_exec(), and update_features().

02916 {
02917    return set_format(chan, fmt, &chan->rawreadformat, &chan->readformat,
02918            &chan->readtrans, 0);
02919 }

void ast_set_variables	(	struct ast_channel *	chan,
		struct ast_variable *	vars
	)

adds a list of channel variables to a channel

Parameters:

	chan	the channel
	vars	a linked list of variables

Variable names can be for a regular channel variable or a dialplan function that has the ability to be written to.

Definition at line 4470 of file channel.c.

References ast_variable::name, ast_variable::next, pbx_builtin_setvar_helper(), and ast_variable::value.

Referenced by __ast_request_and_dial(), ast_pbx_outgoing_app(), and ast_pbx_outgoing_exten().

04471 {
04472    struct ast_variable *cur;
04473 
04474    for (cur = vars; cur; cur = cur->next)
04475       pbx_builtin_setvar_helper(chan, cur->name, cur->value);  
04476 }

int ast_set_write_format	(	struct ast_channel *	chan,
		int	format
	)

Sets write format on channel chan Set write format for channel to whichever compoent of "format" is best.

Parameters:

	chan	channel to change
	format	new format for writing

Returns:: Returns 0 on success, -1 on failure

Definition at line 2921 of file channel.c.

References ast_channel::rawwriteformat, set_format(), ast_channel::writeformat, and ast_channel::writetrans.

Referenced by __login_exec(), __oh323_update_info(), agent_call(), alarmreceiver_exec(), ast_adsi_transmit_message_full(), ast_channel_formats_reset(), ast_channel_make_compatible(), ast_channel_start_silence_generator(), ast_channel_stop_silence_generator(), ast_channel_whisper_stop(), ast_openstream_full(), ast_set_best_format(), ast_stopstream(), ast_write(), attempt_reconnect(), build_conf(), channel_spy(), chanspy_exec(), conf_run(), disa_exec(), echo_exec(), extenspy_exec(), function_ilink(), gtalk_rtp_read(), linear_alloc(), linear_release(), mgcp_rtp_read(), milliwatt_exec(), moh_alloc(), moh_files_release(), moh_release(), mp3_exec(), mwanalyze_exec(), NBScat_exec(), oh323_rtp_read(), playtones_alloc(), playtones_release(), process_sdp(), rpt(), rpt_exec(), rxfax_exec(), send_waveform_to_channel(), setup_rtp_connection(), sip_rtp_read(), skinny_rtp_read(), socket_process(), tonepair_alloc(), tonepair_release(), txfax_exec(), and update_features().

02922 {
02923    return set_format(chan, fmt, &chan->rawwriteformat, &chan->writeformat,
02924            &chan->writetrans, 1);
02925 }

int ast_setstate	(	struct ast_channel *	chan,
		enum	ast_channel_state
	)

Change the state of a channel.

Definition at line 3722 of file channel.c.

References ast_channel::_state, ast_device_state_changed_literal(), ast_state2str(), ast_channel::cid, ast_callerid::cid_name, ast_callerid::cid_num, EVENT_FLAG_CALL, manager_event(), and S_OR.

Referenced by __ast_read(), __oh323_update_info(), __zt_exception(), agent_call(), alsa_answer(), ast_answer(), cb_events(), check_availability(), gtalk_call(), gtalk_newcall(), handle_invite_replaces(), handle_offhook_message(), handle_request_invite(), handle_response_invite(), handle_soft_key_event_message(), handle_stimulus_message(), iax2_call(), mgcp_answer(), mgcp_call(), mgcp_ss(), misdn_call(), misdn_indication(), nbs_call(), nbs_hangup(), oh323_answer(), oss_answer(), pbx_builtin_busy(), pbx_builtin_congestion(), phone_answer(), phone_call(), phone_exception(), phone_hangup(), phone_write(), release_chan(), sip_answer(), skinny_answer(), skinny_call(), skinny_newcall(), ss_thread(), update_state(), zt_answer(), zt_call(), zt_handle_event(), zt_indicate(), and zt_read().

03723 {
03724    int oldstate = chan->_state;
03725 
03726    if (oldstate == state)
03727       return 0;
03728 
03729    chan->_state = state;
03730    ast_device_state_changed_literal(chan->name);
03731    /* setstate used to conditionally report Newchannel; this is no more */
03732    manager_event(EVENT_FLAG_CALL,
03733             "Newstate",
03734             "Channel: %s\r\n"
03735             "State: %s\r\n"
03736             "CallerID: %s\r\n"
03737             "CallerIDName: %s\r\n"
03738             "Uniqueid: %s\r\n",
03739             chan->name, ast_state2str(chan->_state),
03740             S_OR(chan->cid.cid_num, "<unknown>"),
03741             S_OR(chan->cid.cid_name, "<unknown>"),
03742             chan->uniqueid);
03743 
03744    return 0;
03745 }

int ast_settimeout	(	struct ast_channel *	c,
		int	samples,
		int()(void data)	func,
		void *	data
	)

Definition at line 2018 of file channel.c.

References ast_log(), LOG_DEBUG, option_debug, ast_channel::timingdata, ast_channel::timingfd, and ast_channel::timingfunc.

Referenced by __ast_read(), ast_activate_generator(), ast_closestream(), ast_deactivate_generator(), and ast_readaudio_callback().

02019 {
02020    int res = -1;
02021 #ifdef HAVE_ZAPTEL
02022    if (c->timingfd > -1) {
02023       if (!func) {
02024          samples = 0;
02025          data = 0;
02026       }
02027       if (option_debug)
02028          ast_log(LOG_DEBUG, "Scheduling timer at %d sample intervals\n", samples);
02029       res = ioctl(c->timingfd, ZT_TIMERCONFIG, &samples);
02030       c->timingfunc = func;
02031       c->timingdata = data;
02032    }
02033 #endif   
02034    return res;
02035 }

int ast_shutting_down ( void )

Returns non-zero if Asterisk is being shut down.

Returns non-zero if Asterisk is being shut down

Definition at line 472 of file channel.c.

References shutting_down.

00473 {
00474    return shutting_down;
00475 }

int ast_softhangup	(	struct ast_channel *	chan,
		int	cause
	)

Softly hangup up a channel.

Parameters:

	chan	channel to be soft-hung-up Call the protocol layer, but don't destroy the channel structure (use this if you are trying to safely hangup a channel managed by another thread.
	cause	Ast hangupcause for hangup

Returns:: Returns 0 regardless

Definition at line 1522 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_softhangup_nolock(), and ast_channel_spy::chan.

Referenced by __ast_module_user_hangup_all(), __unload_module(), action_hangup(), agent_hangup(), agent_logoff(), ast_begin_shutdown(), function_ilink(), handle_hangup(), handle_link_data(), handle_softhangup(), manager_park(), read_agent_config(), rpt(), rpt_call(), rpt_do_restart(), sla_handle_hold_event(), softhangup_exec(), start_spying(), startmon(), unload_module(), and zt_handle_event().

01523 {
01524    int res;
01525    ast_channel_lock(chan);
01526    res = ast_softhangup_nolock(chan, cause);
01527    ast_channel_unlock(chan);
01528    return res;
01529 }

int ast_softhangup_nolock	(	struct ast_channel *	chan,
		int	cause
	)

Softly hangup up a channel (no channel lock).

Parameters:

	chan	channel to be soft-hung-up
	cause	Ast hangupcause for hangup (see cause.h)

Definition at line 1508 of file channel.c.

References ast_channel::_softhangup, AST_FLAG_BLOCKING, ast_log(), ast_null_frame, ast_queue_frame(), ast_test_flag, ast_channel::blocker, ast_channel_spy::chan, LOG_DEBUG, and option_debug.

Referenced by ast_async_goto(), ast_softhangup(), attempt_transfer(), do_monitor(), oh323_indicate(), sip_indicate(), and skinny_indicate().

01509 {
01510    if (option_debug)
01511       ast_log(LOG_DEBUG, "Soft-Hanging up channel '%s'\n", chan->name);
01512    /* Inform channel driver that we need to be hung up, if it cares */
01513    chan->_softhangup |= cause;
01514    ast_queue_frame(chan, &ast_null_frame);
01515    /* Interrupt any poll call or such */
01516    if (ast_test_flag(chan, AST_FLAG_BLOCKING))
01517       pthread_kill(chan->blocker, SIGURG);
01518    return 0;
01519 }

char* ast_state2str ( enum ast_channel_state )

Gives the string form of a given channel state.

Parameters:

ast_channel_state

state to get the name of Give a name to a state Returns the text form of the binary state given

Definition at line 611 of file channel.c.

References AST_STATE_BUSY, AST_STATE_DIALING, AST_STATE_DIALING_OFFHOOK, AST_STATE_DOWN, AST_STATE_OFFHOOK, AST_STATE_PRERING, AST_STATE_RESERVED, AST_STATE_RING, AST_STATE_RINGING, AST_STATE_UP, and STATE2STR_BUFSIZE.

Referenced by action_status(), agent_hangup(), ast_setstate(), attempt_transfer(), func_channel_read(), handle_chanlist(), handle_chanlist_deprecated(), handle_invite_replaces(), handle_showchan(), handle_showchan_deprecated(), local_attended_transfer(), mgcp_new(), serialize_showchan(), and sip_hangup().

00612 {
00613    char *buf;
00614 
00615    switch(state) {
00616    case AST_STATE_DOWN:
00617       return "Down";
00618    case AST_STATE_RESERVED:
00619       return "Rsrvd";
00620    case AST_STATE_OFFHOOK:
00621       return "OffHook";
00622    case AST_STATE_DIALING:
00623       return "Dialing";
00624    case AST_STATE_RING:
00625       return "Ring";
00626    case AST_STATE_RINGING:
00627       return "Ringing";
00628    case AST_STATE_UP:
00629       return "Up";
00630    case AST_STATE_BUSY:
00631       return "Busy";
00632    case AST_STATE_DIALING_OFFHOOK:
00633       return "Dialing Offhook";
00634    case AST_STATE_PRERING:
00635       return "Pre-ring";
00636    default:
00637       if (!(buf = ast_threadstorage_get(&state2str_threadbuf, STATE2STR_BUFSIZE)))
00638          return "Unknown";
00639       snprintf(buf, STATE2STR_BUFSIZE, "Unknown (%d)", state);
00640       return buf;
00641    }
00642 }

int ast_str2cause ( const char * name )

Convert a symbolic hangup cause to number.

Parameters:

name

string form of the cause Returns the cause code

Definition at line 599 of file channel.c.

References causes.

Referenced by pbx_builtin_hangup().

00600 {
00601    int x;
00602 
00603    for (x = 0; x < sizeof(causes) / sizeof(causes[0]); x++)
00604       if (strncasecmp(causes[x].name, name, strlen(causes[x].name)) == 0)
00605          return causes[x].cause;
00606 
00607    return -1;
00608 }

int ast_tonepair	(	struct ast_channel *	chan,
		int	freq1,
		int	freq2,
		int	duration,
		int	vol
	)

Play a tone pair for a given amount of time

Definition at line 4345 of file channel.c.

References ast_frfree(), ast_read(), ast_tonepair_start(), ast_waitfor(), f, and ast_channel::generatordata.

Referenced by zapateller_exec().

04346 {
04347    int res;
04348 
04349    if ((res = ast_tonepair_start(chan, freq1, freq2, duration, vol)))
04350       return res;
04351 
04352    /* Give us some wiggle room */
04353    while (chan->generatordata && ast_waitfor(chan, 100) >= 0) {
04354       struct ast_frame *f = ast_read(chan);
04355       if (f)
04356          ast_frfree(f);
04357       else
04358          return -1;
04359    }
04360    return 0;
04361 }

int ast_tonepair_start	(	struct ast_channel *	chan,
		int	freq1,
		int	freq2,
		int	duration,
		int	vol
	)

Start a tone going

Definition at line 4327 of file channel.c.

References ast_activate_generator(), tonepair_def::duration, tonepair_def::freq1, tonepair_def::freq2, tonepair, and tonepair_def::vol.

Referenced by ast_tonepair(), play_dialtone(), play_tone_pair(), rpt_tele_thread(), and sendnoise().

04328 {
04329    struct tonepair_def d = { 0, };
04330 
04331    d.freq1 = freq1;
04332    d.freq2 = freq2;
04333    d.duration = duration;
04334    d.vol = (vol < 1) ? 8192 : vol; /* force invalid to 8192 */
04335    if (ast_activate_generator(chan, &tonepair, &d))
04336       return -1;
04337    return 0;
04338 }

void ast_tonepair_stop ( struct ast_channel * chan )

Stop a tone from playing

Definition at line 4340 of file channel.c.

References ast_deactivate_generator().

Referenced by sendnoise().

04341 {
04342    ast_deactivate_generator(chan);
04343 }

int ast_transfer	(	struct ast_channel *	chan,
		char *	dest
	)

Transfer a channel (if supported). Returns -1 on error, 0 if not supported and 1 if supported and requested.

Called by:

app_transfer
the manager interface

Definition at line 3129 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_check_hangup(), AST_FLAG_ZOMBIE, ast_test_flag, ast_channel::tech, and ast_channel_tech::transfer.

Referenced by transfer_exec().

03130 {
03131    int res = -1;
03132 
03133    /* Stop if we're a zombie or need a soft hangup */
03134    ast_channel_lock(chan);
03135    if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan)) {
03136       if (chan->tech->transfer) {
03137          res = chan->tech->transfer(chan, dest);
03138          if (!res)
03139             res = 1;
03140       } else
03141          res = 0;
03142    }
03143    ast_channel_unlock(chan);
03144    return res;
03145 }

char* ast_transfercapability2str ( int transfercapability ) const

Gives the string form of a given transfer capability.

Parameters:

transfercapability

transfercapabilty to get the name of Give a name to a transfercapbility See above Returns the text form of the binary transfer capbility

Definition at line 645 of file channel.c.

References AST_TRANS_CAP_3_1K_AUDIO, AST_TRANS_CAP_DIGITAL, AST_TRANS_CAP_DIGITAL_W_TONES, AST_TRANS_CAP_RESTRICTED_DIGITAL, AST_TRANS_CAP_SPEECH, and AST_TRANS_CAP_VIDEO.

Referenced by cb_events(), misdn_call(), oh323_call(), zt_call(), and zt_new().

00646 {
00647    switch(transfercapability) {
00648    case AST_TRANS_CAP_SPEECH:
00649       return "SPEECH";
00650    case AST_TRANS_CAP_DIGITAL:
00651       return "DIGITAL";
00652    case AST_TRANS_CAP_RESTRICTED_DIGITAL:
00653       return "RESTRICTED_DIGITAL";
00654    case AST_TRANS_CAP_3_1K_AUDIO:
00655       return "3K1AUDIO";
00656    case AST_TRANS_CAP_DIGITAL_W_TONES:
00657       return "DIGITAL_W_TONES";
00658    case AST_TRANS_CAP_VIDEO:
00659       return "VIDEO";
00660    default:
00661       return "UNKNOWN";
00662    }
00663 }

int ast_waitfor	(	struct ast_channel *	chan,
		int	ms
	)

Wait for input on a channel.

Parameters:

	chan	channel to wait on
	ms	length of time to wait on the channel Wait for input on a channel for a given # of milliseconds (<0 for indefinite).

Returns:: Returns < 0 on failure, 0 if nothing ever arrived, and the # of ms remaining otherwise

Definition at line 2002 of file channel.c.

References ast_waitfor_nandfds().

Referenced by __adsi_transmit_messages(), __ast_play_and_record(), __ast_request_and_dial(), adsi_careful_send(), agent_ack_sleep(), ast_dtmf_stream(), ast_recvtext(), ast_safe_sleep_conditional(), ast_tonepair(), async_wait(), background_detect_exec(), channel_spy(), conf_exec(), conf_flush(), dictate_exec(), disa_exec(), do_waiting(), echo_exec(), handle_recordfile(), ices_exec(), isAnsweringMachine(), measurenoise(), mp3_exec(), mwanalyze_exec(), NBScat_exec(), nv_background_detect_exec(), nv_detectfax_exec(), receive_dtmf_digits(), recordthread(), rxfax_exec(), send_tone_burst(), send_waveform_to_channel(), sendurl_exec(), speech_background(), ss_thread(), txfax_exec(), wait_for_hangup(), waitforring_exec(), and waitstream_core().

02003 {
02004    int oldms = ms;   /* -1 if no timeout */
02005 
02006    ast_waitfor_nandfds(&c, 1, NULL, 0, NULL, NULL, &ms);
02007    if ((ms < 0) && (oldms < 0))
02008       ms = 0;
02009    return ms;
02010 }

struct ast_channel* ast_waitfor_n	(	struct ast_channel **	chan,
		int	n,
		int *	ms
	)

Waits for input on a group of channels Wait for input on an array of channels for a given # of milliseconds.

Returns:: Return channel with activity, or NULL if none has activity.

Parameters:

	chan	an array of pointers to channels
	n	number of channels that are to be waited upon
	ms	time "ms" is modified in-place, if applicable

Definition at line 1997 of file channel.c.

References ast_waitfor_nandfds().

Referenced by ast_feature_request_and_dial(), ast_udptl_bridge(), autoservice_run(), bridge_native_loop(), bridge_p2p_loop(), misdn_bridge(), monitor_dial(), rpt(), wait_for_answer(), wait_for_winner(), and zt_bridge().

01998 {
01999    return ast_waitfor_nandfds(c, n, NULL, 0, NULL, NULL, ms);
02000 }

int ast_waitfor_n_fd	(	int *	fds,
		int	n,
		int *	ms,
		int *	exception
	)

Waits for input on an fd This version works on fd's only. Be careful with it.

Definition at line 1842 of file channel.c.

References ast_waitfor_nandfds().

Referenced by dundi_lookup_internal(), and dundi_precache_internal().

01843 {
01844    int winner = -1;
01845    ast_waitfor_nandfds(NULL, 0, fds, n, exception, &winner, ms);
01846    return winner;
01847 }

struct ast_channel* ast_waitfor_nandfds	(	struct ast_channel **	chan,
		int	n,
		int *	fds,
		int	nfds,
		int *	exception,
		int *	outfd,
		int *	ms
	)

Waits for activity on a group of channels.

Parameters:

	chan	an array of pointers to channels
	n	number of channels that are to be waited upon
	fds	an array of fds to wait upon
	nfds	the number of fds to wait upon
	exception	exception flag
	outfd	fd that had activity on it
	ms	how long the wait was Big momma function here. Wait for activity on any of the n channels, or any of the nfds file descriptors.

Returns:: Returns the channel with activity, or NULL on error or if an FD came first. If the FD came first, it will be returned in outfd, otherwise, outfd will be -1

Definition at line 1850 of file channel.c.

References ast_channel::_softhangup, ast_add_fd(), ast_channel_lock, ast_channel_unlock, ast_clear_flag, ast_do_masquerade(), AST_FLAG_BLOCKING, AST_FLAG_EXCEPTION, ast_log(), AST_MAX_FDS, ast_set_flag, AST_SOFTHANGUP_TIMEOUT, CHECK_BLOCKING, LOG_WARNING, poll(), POLLPRI, and ast_channel::whentohangup.

Referenced by app_exec(), ast_waitfor(), ast_waitfor_n(), ast_waitfor_n_fd(), ast_waitfordigit_full(), conf_run(), find_cache(), run_agi(), and waitstream_core().

01852 {
01853    struct timeval start = { 0 , 0 };
01854    struct pollfd *pfds;
01855    int res;
01856    long rms;
01857    int x, y, max;
01858    int sz;
01859    time_t now = 0;
01860    long whentohangup = 0, diff;
01861    struct ast_channel *winner = NULL;
01862    struct fdmap {
01863       int chan;
01864       int fdno;
01865    } *fdmap;
01866 
01867    sz = n * AST_MAX_FDS + nfds;
01868    pfds = alloca(sizeof(*pfds) * sz);
01869    fdmap = alloca(sizeof(*fdmap) * sz);
01870 
01871    if (outfd)
01872       *outfd = -99999;
01873    if (exception)
01874       *exception = 0;
01875    
01876    /* Perform any pending masquerades */
01877    for (x=0; x < n; x++) {
01878       ast_channel_lock(c[x]);
01879       if (c[x]->masq) {
01880          if (ast_do_masquerade(c[x])) {
01881             ast_log(LOG_WARNING, "Masquerade failed\n");
01882             *ms = -1;
01883             ast_channel_unlock(c[x]);
01884             return NULL;
01885          }
01886       }
01887       if (c[x]->whentohangup) {
01888          if (!whentohangup)
01889             time(&now);
01890          diff = c[x]->whentohangup - now;
01891          if (diff < 1) {
01892             /* Should already be hungup */
01893             c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
01894             ast_channel_unlock(c[x]);
01895             return c[x];
01896          }
01897          if (!whentohangup || (diff < whentohangup))
01898             whentohangup = diff;
01899       }
01900       ast_channel_unlock(c[x]);
01901    }
01902    /* Wait full interval */
01903    rms = *ms;
01904    if (whentohangup) {
01905       rms = whentohangup * 1000;              /* timeout in milliseconds */
01906       if (*ms >= 0 && *ms < rms)    /* original *ms still smaller */
01907          rms =  *ms;
01908    }
01909    /*
01910     * Build the pollfd array, putting the channels' fds first,
01911     * followed by individual fds. Order is important because
01912     * individual fd's must have priority over channel fds.
01913     */
01914    max = 0;
01915    for (x=0; x<n; x++) {
01916       for (y=0; y<AST_MAX_FDS; y++) {
01917          fdmap[max].fdno = y;  /* fd y is linked to this pfds */
01918          fdmap[max].chan = x;  /* channel x is linked to this pfds */
01919          max += ast_add_fd(&pfds[max], c[x]->fds[y]);
01920       }
01921       CHECK_BLOCKING(c[x]);
01922    }
01923    /* Add the individual fds */
01924    for (x=0; x<nfds; x++) {
01925       fdmap[max].chan = -1;
01926       max += ast_add_fd(&pfds[max], fds[x]);
01927    }
01928 
01929    if (*ms > 0)
01930       start = ast_tvnow();
01931    
01932    if (sizeof(int) == 4) { /* XXX fix timeout > 600000 on linux x86-32 */
01933       do {
01934          int kbrms = rms;
01935          if (kbrms > 600000)
01936             kbrms = 600000;
01937          res = poll(pfds, max, kbrms);
01938          if (!res)
01939             rms -= kbrms;
01940       } while (!res && (rms > 0));
01941    } else {
01942       res = poll(pfds, max, rms);
01943    }
01944    for (x=0; x<n; x++)
01945       ast_clear_flag(c[x], AST_FLAG_BLOCKING);
01946    if (res < 0) { /* Simulate a timeout if we were interrupted */
01947       if (errno != EINTR)
01948          *ms = -1;
01949       return NULL;
01950    }
01951    if (whentohangup) {   /* if we have a timeout, check who expired */
01952       time(&now);
01953       for (x=0; x<n; x++) {
01954          if (c[x]->whentohangup && now >= c[x]->whentohangup) {
01955             c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
01956             if (winner == NULL)
01957                winner = c[x];
01958          }
01959       }
01960    }
01961    if (res == 0) { /* no fd ready, reset timeout and done */
01962       *ms = 0; /* XXX use 0 since we may not have an exact timeout. */
01963       return winner;
01964    }
01965    /*
01966     * Then check if any channel or fd has a pending event.
01967     * Remember to check channels first and fds last, as they
01968     * must have priority on setting 'winner'
01969     */
01970    for (x = 0; x < max; x++) {
01971       res = pfds[x].revents;
01972       if (res == 0)
01973          continue;
01974       if (fdmap[x].chan >= 0) {  /* this is a channel */
01975          winner = c[fdmap[x].chan]; /* override previous winners */
01976          if (res & POLLPRI)
01977             ast_set_flag(winner, AST_FLAG_EXCEPTION);
01978          else
01979             ast_clear_flag(winner, AST_FLAG_EXCEPTION);
01980          winner->fdno = fdmap[x].fdno;
01981       } else {       /* this is an fd */
01982          if (outfd)
01983             *outfd = pfds[x].fd;
01984          if (exception)
01985             *exception = (res & POLLPRI) ? -1 : 0;
01986          winner = NULL;
01987       }
01988    }
01989    if (*ms > 0) {
01990       *ms -= ast_tvdiff_ms(ast_tvnow(), start);
01991       if (*ms < 0)
01992          *ms = 0;
01993    }
01994    return winner;
01995 }

int ast_waitfordigit	(	struct ast_channel *	c,
		int	ms
	)

Waits for a digit.

!

Parameters:

	c	channel to wait for a digit on
	ms	how many milliseconds to wait

Returns:: Returns <0 on error, 0 on no entry, and the digit on success.

Definition at line 2013 of file channel.c.

References ast_waitfordigit_full().

Referenced by _while_exec(), advanced_options(), ast_adsi_get_cpeid(), ast_adsi_get_cpeinfo(), ast_adsi_print(), ast_adsi_read_encoded_dtmf(), ast_adsi_transmit_message_full(), ast_app_dtget(), ast_control_streamfile(), ast_record_review(), builtin_atxfer(), collect_digits(), common_exec(), cpeid_exec(), dialout(), directory_exec(), forward_message(), get_folder(), ivr_dispatch(), mgcp_ss(), my_getsigstr(), pbx_builtin_waitexten(), play_mailbox_owner(), play_record_review(), read_exec(), read_newoption(), retrydial_exec(), sendnoise(), skinny_ss(), ss_thread(), test1_client(), test1_server(), vm_execmain(), vm_forwardoptions(), vm_instructions(), vm_options(), vm_tempgreeting(), wait_a_bit(), and wait_our_turn().

02014 {
02015    return ast_waitfordigit_full(c, ms, -1, -1);
02016 }

int ast_waitfordigit_full	(	struct ast_channel *	c,
		int	ms,
		int	audiofd,
		int	ctrlfd
	)

Wait for a digit Same as ast_waitfordigit() with audio fd for outputting read audio and ctrlfd to monitor for reading.

Parameters:

	c	channel to wait for a digit on
	ms	how many milliseconds to wait
	audiofd	audio file descriptor to write to if audio frames are received
	ctrlfd	control file descriptor to monitor for reading

Returns:: Returns 1 if ctrlfd becomes available

Definition at line 2037 of file channel.c.

References ast_check_hangup(), AST_CONTROL_ANSWER, AST_CONTROL_HANGUP, AST_CONTROL_RINGING, AST_FLAG_ZOMBIE, AST_FRAME_CONTROL, AST_FRAME_DTMF, AST_FRAME_VOICE, ast_frfree(), ast_log(), ast_read(), ast_test_flag, ast_waitfor_nandfds(), f, and LOG_WARNING.

Referenced by ast_readstring_full(), ast_waitfordigit(), handle_getoption(), and handle_waitfordigit().

02038 {
02039 
02040    /* Stop if we're a zombie or need a soft hangup */
02041    if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
02042       return -1;
02043    /* Wait for a digit, no more than ms milliseconds total. */
02044    while (ms) {
02045       struct ast_channel *rchan;
02046       int outfd;
02047 
02048       errno = 0;
02049       rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
02050       if (!rchan && outfd < 0 && ms) {
02051          if (errno == 0 || errno == EINTR)
02052             continue;
02053          ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
02054          return -1;
02055       } else if (outfd > -1) {
02056          /* The FD we were watching has something waiting */
02057          return 1;
02058       } else if (rchan) {
02059          int res;
02060          struct ast_frame *f = ast_read(c);
02061          if (!f)
02062             return -1;
02063 
02064          switch(f->frametype) {
02065          case AST_FRAME_DTMF:
02066             res = f->subclass;
02067             ast_frfree(f);
02068             return res;
02069          case AST_FRAME_CONTROL:
02070             switch(f->subclass) {
02071             case AST_CONTROL_HANGUP:
02072                ast_frfree(f);
02073                return -1;
02074             case AST_CONTROL_RINGING:
02075             case AST_CONTROL_ANSWER:
02076                /* Unimportant */
02077                break;
02078             default:
02079                ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", f->subclass);
02080                break;
02081             }
02082             break;
02083          case AST_FRAME_VOICE:
02084             /* Write audio if appropriate */
02085             if (audiofd > -1)
02086                write(audiofd, f->data, f->datalen);
02087          default:
02088             /* Ignore */
02089             break;
02090          }
02091          ast_frfree(f);
02092       }
02093    }
02094    return 0; /* Time is up */
02095 }

struct ast_channel* ast_walk_channel_by_exten_locked	(	const struct ast_channel *	chan,
		const char *	exten,
		const char *	context
	)

Get next channel by exten (and optionally context) and lock it.

Definition at line 1104 of file channel.c.

References channel_find_locked().

Referenced by next_channel().

01106 {
01107    return channel_find_locked(chan, NULL, 0, context, exten);
01108 }

struct ast_channel* ast_walk_channel_by_name_prefix_locked	(	const struct ast_channel *	chan,
		const char *	name,
		const int	namelen
	)

Get channel by name prefix (locks channel).

Definition at line 1091 of file channel.c.

References channel_find_locked().

Referenced by next_channel().

01093 {
01094    return channel_find_locked(chan, name, namelen, NULL, NULL);
01095 }

int ast_write	(	struct ast_channel *	chan,
		struct ast_frame *	frame
	)

Write a frame to a channel This function writes the given frame to the indicated channel.

Parameters:

	chan	destination channel of the frame
	frame	frame that will be written

Returns:: It returns 0 on success, -1 on failure.

Todo:: XXX should return 0 maybe ?

Definition at line 2673 of file channel.c.

References ast_channel::_softhangup, ast_channel_lock, ast_channel_unlock, ast_check_hangup(), ast_clear_flag, ast_deactivate_generator(), ast_do_masquerade(), AST_FLAG_BLOCKING, AST_FLAG_WHISPER, AST_FLAG_WRITE_INT, AST_FLAG_ZOMBIE, AST_FORMAT_SLINEAR, ast_frame_adjust_volume(), AST_FRAME_CONTROL, AST_FRAME_DTMF_BEGIN, AST_FRAME_DTMF_END, ast_frame_dump(), AST_FRAME_HTML, AST_FRAME_IAX, AST_FRAME_MODEM, AST_FRAME_NULL, ast_frame_slinear_sum(), AST_FRAME_TEXT, AST_FRAME_VIDEO, AST_FRAME_VOICE, ast_frfree(), ast_log(), AST_MONITOR_RUNNING, ast_mutex_lock(), ast_mutex_unlock(), ast_seekstream(), ast_senddigit_begin(), ast_senddigit_end(), ast_set_write_format(), ast_slinfactory_available(), ast_slinfactory_read(), AST_SOFTHANGUP_DEV, ast_test_flag, ast_translate(), ast_translator_build_path(), ast_translator_free_path(), ast_writestream(), CHECK_BLOCKING, ast_frame::data, ast_frame::datalen, DEBUGCHAN_FLAG, f, ast_channel::fout, FRAMECOUNT_INC, ast_frame::frametype, ast_channel::generatordata, ast_channel_tech::indicate, ast_channel::insmpl, ast_frame::len, ast_channel_whisper_buffer::lock, LOG_WARNING, ast_channel::masq, ast_channel::masqr, ast_channel::monitor, MONITOR_DELAY, ast_channel_whisper_buffer::original_format, ast_channel::outsmpl, ast_channel_whisper_buffer::path, queue_frame_to_spies(), ast_channel::rawwriteformat, SEEK_FORCECUR, ast_channel_tech::send_html, ast_channel_tech::send_text, ast_channel_whisper_buffer::sf, ast_channel::spies, SPY_WRITE, ast_channel_monitor::state, ast_frame::subclass, ast_channel::tech, ast_channel::whisper, ast_channel_tech::write, ast_channel_monitor::write_stream, ast_channel_tech::write_video, ast_channel::writeformat, and ast_channel::writetrans.

Referenced by adsi_careful_send(), agent_write(), ast_prod(), ast_readaudio_callback(), ast_readvideo_callback(), ast_udptl_bridge(), ast_write_video(), bridge_native_loop(), bridge_p2p_loop(), conf_queue_dtmf(), conf_run(), dictate_exec(), echo_exec(), features_write(), function_ilink(), gen_generate(), handle_link_data(), jb_get_and_deliver(), linear_generator(), milliwatt_generate(), misdn_bridge(), moh_files_generator(), moh_generate(), mp3_exec(), mwanalyze_exec(), NBScat_exec(), rpt(), rpt_call(), rxfax_exec(), send_link_dtmf(), send_tone_burst(), send_waveform_to_channel(), silence_generator_generate(), spy_generate(), txfax_exec(), wait_for_answer(), and zt_bridge().

02674 {
02675    int res = -1;
02676    struct ast_frame *f = NULL;
02677 
02678    /* Stop if we're a zombie or need a soft hangup */
02679    ast_channel_lock(chan);
02680    if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))
02681       goto done;
02682 
02683    /* Handle any pending masquerades */
02684    if (chan->masq && ast_do_masquerade(chan)) {
02685       ast_log(LOG_WARNING, "Failed to perform masquerade\n");
02686       goto done;
02687    }
02688    if (chan->masqr) {
02689       res = 0; /* XXX explain, why 0 ? */
02690       goto done;
02691    }
02692    if (chan->generatordata) {
02693       if (ast_test_flag(chan, AST_FLAG_WRITE_INT))
02694          ast_deactivate_generator(chan);
02695       else {
02696          res = 0; /* XXX explain, why 0 ? */
02697          goto done;
02698       }
02699    }
02700    /* High bit prints debugging */
02701    if (chan->fout & DEBUGCHAN_FLAG)
02702       ast_frame_dump(chan->name, fr, ">>");
02703    CHECK_BLOCKING(chan);
02704    switch(fr->frametype) {
02705    case AST_FRAME_CONTROL:
02706       res = (chan->tech->indicate == NULL) ? 0 :
02707          chan->tech->indicate(chan, fr->subclass, fr->data, fr->datalen);
02708       break;
02709    case AST_FRAME_DTMF_BEGIN:
02710       ast_clear_flag(chan, AST_FLAG_BLOCKING);
02711       ast_channel_unlock(chan);
02712       res = ast_senddigit_begin(chan, fr->subclass);
02713       ast_channel_lock(chan);
02714       CHECK_BLOCKING(chan);
02715       break;
02716    case AST_FRAME_DTMF_END:
02717       ast_clear_flag(chan, AST_FLAG_BLOCKING);
02718       ast_channel_unlock(chan);
02719       res = ast_senddigit_end(chan, fr->subclass, fr->len);
02720       ast_channel_lock(chan);
02721       CHECK_BLOCKING(chan);
02722       break;
02723    case AST_FRAME_TEXT:
02724       res = (chan->tech->send_text == NULL) ? 0 :
02725          chan->tech->send_text(chan, (char *) fr->data);
02726       break;
02727    case AST_FRAME_HTML:
02728       res = (chan->tech->send_html == NULL) ? 0 :
02729          chan->tech->send_html(chan, fr->subclass, (char *) fr->data, fr->datalen);
02730       break;
02731    case AST_FRAME_VIDEO:
02732       /* XXX Handle translation of video codecs one day XXX */
02733       res = (chan->tech->write_video == NULL) ? 0 :
02734          chan->tech->write_video(chan, fr);
02735       break;
02736    case AST_FRAME_MODEM:
02737       res = (chan->tech->write == NULL) ? 0 :
02738          chan->tech->write(chan, fr);
02739       break;
02740    case AST_FRAME_VOICE:
02741       if (chan->tech->write == NULL)
02742          break;   /*! \todo XXX should return 0 maybe ? */
02743 
02744       /* If someone is whispering on this channel then we must ensure that we are always getting signed linear frames */
02745       if (ast_test_flag(chan, AST_FLAG_WHISPER)) {
02746          if (fr->subclass == AST_FORMAT_SLINEAR)
02747             f = fr;
02748          else {
02749             ast_mutex_lock(&chan->whisper->lock);
02750             if (chan->writeformat != AST_FORMAT_SLINEAR) {
02751                /* Rebuild the translation path and set our write format back to signed linear */
02752                chan->whisper->original_format = chan->writeformat;
02753                ast_set_write_format(chan, AST_FORMAT_SLINEAR);
02754                if (chan->whisper->path)
02755                   ast_translator_free_path(chan->whisper->path);
02756                chan->whisper->path = ast_translator_build_path(AST_FORMAT_SLINEAR, chan->whisper->original_format);
02757             }
02758             /* Translate frame using the above translation path */
02759             f = (chan->whisper->path) ? ast_translate(chan->whisper->path, fr, 0) : fr;
02760             ast_mutex_unlock(&chan->whisper->lock);
02761          }
02762       } else {
02763          /* If the frame is in the raw write format, then it's easy... just use the frame - otherwise we will have to translate */
02764          if (fr->subclass == chan->rawwriteformat)
02765             f = fr;
02766          else
02767             f = (chan->writetrans) ? ast_translate(chan->writetrans, fr, 0) : fr;
02768       }
02769 
02770       /* If we have no frame of audio, then we have to bail out */
02771       if (f == NULL) {
02772          res = 0;
02773          break;
02774       }
02775 
02776       /* If spies are on the channel then queue the frame out to them */
02777       if (chan->spies)
02778          queue_frame_to_spies(chan, f, SPY_WRITE);
02779 
02780       /* If Monitor is running on this channel, then we have to write frames out there too */
02781       if (chan->monitor && chan->monitor->write_stream) {
02782          /* XXX must explain this code */
02783 #ifndef MONITOR_CONSTANT_DELAY
02784          int jump = chan->insmpl - chan->outsmpl - 4 * f->samples;
02785          if (jump >= 0) {
02786             jump = chan->insmpl - chan->outsmpl;
02787             if (ast_seekstream(chan->monitor->write_stream, jump, SEEK_FORCECUR) == -1)
02788                ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
02789             chan->outsmpl += jump + f->samples;
02790          } else
02791             chan->outsmpl += f->samples;
02792 #else
02793          int jump = chan->insmpl - chan->outsmpl;
02794          if (jump - MONITOR_DELAY >= 0) {
02795             if (ast_seekstream(chan->monitor->write_stream, jump - f->samples, SEEK_FORCECUR) == -1)
02796                ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
02797             chan->outsmpl += jump;
02798          } else
02799             chan->outsmpl += f->samples;
02800 #endif
02801          if (chan->monitor->state == AST_MONITOR_RUNNING) {
02802             if (ast_writestream(chan->monitor->write_stream, f) < 0)
02803                ast_log(LOG_WARNING, "Failed to write data to channel monitor write stream\n");
02804          }
02805       }
02806 
02807       /* Finally the good part! Write this out to the channel */
02808       if (ast_test_flag(chan, AST_FLAG_WHISPER)) {
02809          /* frame is assumed to be in SLINEAR, since that is
02810             required for whisper mode */
02811          ast_frame_adjust_volume(f, -2);
02812          if (ast_slinfactory_available(&chan->whisper->sf) >= f->samples) {
02813             short buf[f->samples];
02814             struct ast_frame whisper = {
02815                .frametype = AST_FRAME_VOICE,
02816                .subclass = AST_FORMAT_SLINEAR,
02817                .data = buf,
02818                .datalen = sizeof(buf),
02819                .samples = f->samples,
02820             };
02821             
02822             ast_mutex_lock(&chan->whisper->lock);
02823             if (ast_slinfactory_read(&chan->whisper->sf, buf, f->samples))
02824                ast_frame_slinear_sum(f, &whisper);
02825             ast_mutex_unlock(&chan->whisper->lock);
02826          }
02827          /* and now put it through the regular translator */
02828          f = (chan->writetrans) ? ast_translate(chan->writetrans, f, 0) : f;
02829       }
02830       if (f)
02831          res = chan->tech->write(chan, f);
02832       else
02833          res = 0;
02834       break;
02835    case AST_FRAME_NULL:
02836    case AST_FRAME_IAX:
02837       /* Ignore these */
02838       res = 0;
02839       break;
02840    default:
02841       /* At this point, fr is the incoming frame and f is NULL.  Channels do
02842        * not expect to get NULL as a frame pointer and will segfault.  Hence,
02843        * we output the original frame passed in. */
02844       res = chan->tech->write(chan, fr);
02845       break;
02846    }
02847 
02848    if (f && f != fr)
02849       ast_frfree(f);
02850    ast_clear_flag(chan, AST_FLAG_BLOCKING);
02851    /* Consider a write failure to force a soft hangup */
02852    if (res < 0)
02853       chan->_softhangup |= AST_SOFTHANGUP_DEV;
02854    else {
02855       chan->fout = FRAMECOUNT_INC(chan->fout);
02856    }
02857 done:
02858    ast_channel_unlock(chan);
02859    return res;
02860 }

int ast_write_video	(	struct ast_channel *	chan,
		struct ast_frame *	frame
	)

Write video frame to a channel This function writes the given frame to the indicated channel.

Parameters:

	chan	destination channel of the frame
	frame	frame that will be written

Returns:: It returns 1 on success, 0 if not implemented, and -1 on failure.

Definition at line 2662 of file channel.c.

References ast_write(), ast_channel::tech, and ast_channel_tech::write_video.

02663 {
02664    int res;
02665    if (!chan->tech->write_video)
02666       return 0;
02667    res = ast_write(chan, fr);
02668    if (!res)
02669       res = 1;
02670    return res;
02671 }

const char* channelreloadreason2txt ( enum channelreloadreason reason )

Convert enum channelreloadreason to text string for manager event.

\ brief Convert channel reloadreason (ENUM) to text string for manager event

Definition at line 4680 of file channel.c.

References CHANNEL_CLI_RELOAD, CHANNEL_MODULE_LOAD, and CHANNEL_MODULE_RELOAD.

04681 {
04682    switch (reason) {
04683    case CHANNEL_MODULE_LOAD:
04684       return "LOAD (Channel module load)";
04685 
04686    case CHANNEL_MODULE_RELOAD:
04687       return "RELOAD (Channel module reload)";
04688 
04689    case CHANNEL_CLI_RELOAD:
04690       return "CLIRELOAD (Channel module reload by CLI command)";
04691 
04692    default:
04693       return "MANAGERRELOAD (Channel module reload by manager)";
04694    }
04695 };

Asterisk developer's documentation

channel.h File Reference

Data Structures

Defines

Typedefs

Enumerations

Functions

Detailed Description

Define Documentation

Typedef Documentation

Enumeration Type Documentation

Function Documentation


Data Structures
struct	ast_bridge_config
	bridge configuration More...
struct	ast_callerid
	Structure for all kinds of caller ID identifications. More...
struct	ast_channel
	Main Channel structure associated with a channel. This is the side of it mostly used by the pbx and call management. More...
struct	ast_channel_tech
	Structure to describe a channel "technology", ie a channel driver See for examples:. More...
struct	ast_datastore
	Structure for a channel data store. More...
struct	ast_datastore_info
	Structure for a data store type. More...
struct	ast_generator
struct	outgoing_helper
Defines
#define	AST_AGENT_FD (AST_MAX_FDS-3)
#define	AST_ALERT_FD (AST_MAX_FDS-1)
#define	AST_BRIDGE_DTMF_CHANNEL_0 (1 << 0)
	Report DTMF on channel 0.
#define	AST_BRIDGE_DTMF_CHANNEL_1 (1 << 1)
	Report DTMF on channel 1.
#define	AST_BRIDGE_IGNORE_SIGS (1 << 4)
	Ignore all signal frames except NULL.
#define	AST_BRIDGE_REC_CHANNEL_0 (1 << 2)
	Return all voice frames on channel 0.
#define	AST_BRIDGE_REC_CHANNEL_1 (1 << 3)
	Return all voice frames on channel 1.
#define	AST_CHANNEL_NAME 80
#define	AST_GENERATOR_FD (AST_MAX_FDS-4)
#define	AST_MAX_CONTEXT 80
#define	AST_MAX_EXTENSION 80
#define	AST_MAX_FDS 8
#define	AST_TIMING_FD (AST_MAX_FDS-2)
#define	CHECK_BLOCKING(c)
#define	CRASH do { } while(0)
#define	DEBUGCHAN_FLAG 0x80000000
#define	FRAMECOUNT_INC(x) ( ((x) & DEBUGCHAN_FLAG) \| (((x)+1) & ~DEBUGCHAN_FLAG) )
#define	LOAD_OH(oh)
#define	MAX_LANGUAGE 20
#define	MAX_MUSICCLASS 80
Typedefs
typedef unsigned long long	ast_group_t
Enumerations
enum	{ AST_CHAN_TP_WANTSJITTER = (1 << 0), AST_CHAN_TP_CREATESJITTER = (1 << 1) }
	ast_channel_tech Properties More...
enum	{ AST_FLAG_DEFER_DTMF = (1 << 1), AST_FLAG_WRITE_INT = (1 << 2), AST_FLAG_BLOCKING = (1 << 3), AST_FLAG_ZOMBIE = (1 << 4), AST_FLAG_EXCEPTION = (1 << 5), AST_FLAG_MOH = (1 << 6), AST_FLAG_SPYING = (1 << 7), AST_FLAG_NBRIDGE = (1 << 8), AST_FLAG_IN_AUTOLOOP = (1 << 9), AST_FLAG_OUTGOING = (1 << 10), AST_FLAG_WHISPER = (1 << 11), AST_FLAG_IN_DTMF = (1 << 12), AST_FLAG_EMULATE_DTMF = (1 << 13), AST_FLAG_END_DTMF_ONLY = (1 << 14) }
	ast_channel flags More...
enum	{ AST_FEATURE_PLAY_WARNING = (1 << 0), AST_FEATURE_REDIRECT = (1 << 1), AST_FEATURE_DISCONNECT = (1 << 2), AST_FEATURE_ATXFER = (1 << 3), AST_FEATURE_AUTOMON = (1 << 4), AST_FEATURE_PARKCALL = (1 << 5) }
	ast_bridge_config flags More...
enum	{ AST_CDR_TRANSFER = (1 << 0), AST_CDR_FORWARD = (1 << 1), AST_CDR_CALLWAIT = (1 << 2), AST_CDR_CONFERENCE = (1 << 3) }
enum	{ AST_SOFTHANGUP_DEV = (1 << 0), AST_SOFTHANGUP_ASYNCGOTO = (1 << 1), AST_SOFTHANGUP_SHUTDOWN = (1 << 2), AST_SOFTHANGUP_TIMEOUT = (1 << 3), AST_SOFTHANGUP_APPUNLOAD = (1 << 4), AST_SOFTHANGUP_EXPLICIT = (1 << 5), AST_SOFTHANGUP_UNBRIDGE = (1 << 6) }
enum	ast_bridge_result { AST_BRIDGE_COMPLETE = 0, AST_BRIDGE_FAILED = -1, AST_BRIDGE_FAILED_NOWARN = -2, AST_BRIDGE_RETRY = -3 }
enum	ast_channel_adsicpe { AST_ADSI_UNKNOWN, AST_ADSI_AVAILABLE, AST_ADSI_UNAVAILABLE, AST_ADSI_OFFHOOKONLY }
enum	ast_channel_state { AST_STATE_DOWN, AST_STATE_RESERVED, AST_STATE_OFFHOOK, AST_STATE_DIALING, AST_STATE_RING, AST_STATE_RINGING, AST_STATE_UP, AST_STATE_BUSY, AST_STATE_DIALING_OFFHOOK, AST_STATE_PRERING, AST_STATE_MUTE = (1 << 16) }
	ast_channel states More...
enum	channelreloadreason { CHANNEL_MODULE_LOAD, CHANNEL_MODULE_RELOAD, CHANNEL_CLI_RELOAD, CHANNEL_MANAGER_RELOAD }
	Channel reload reasons for manager events at load or reload of configuration. More...
Functions
ast_channel *	__ast_request_and_dial (const char type, int format, void data, int timeout, int reason, const char cidnum, const char cidname, struct outgoing_helper oh)
int	ast_activate_generator (struct ast_channel chan, struct ast_generator gen, void *params)
int	ast_active_channels (void)
	returns number of active/allocated channels
static int	ast_add_fd (struct pollfd *pfd, int fd)
	if fd is a valid descriptor, set *pfd with the descriptor
int	ast_answer (struct ast_channel *chan)
	Answer a ringing call.
int	ast_autoservice_start (struct ast_channel *chan)
	Automatically service a channel for us...
int	ast_autoservice_stop (struct ast_channel *chan)
	Stop servicing a channel for us...
void	ast_begin_shutdown (int hangup)
	Initiate system shutdown.
int	ast_best_codec (int fmts)
	Pick the best audio codec.
ast_channel *	ast_bridged_channel (struct ast_channel *chan)
	Find bridged channel.
int	ast_call (struct ast_channel chan, char addr, int timeout)
	Make a call.
void	ast_cancel_shutdown (void)
	Cancel a shutdown in progress.
const char *	ast_cause2str (int state) attribute_pure
	Gives the string form of a given hangup cause.
void	ast_change_name (struct ast_channel chan, char newname)
	Change channel name.
ast_channel *	ast_channel_alloc (int needqueue, int state, const char cid_num, const char cid_name, const char acctcode, const char exten, const char context, const int amaflag, const char name_fmt,...)
	Create a channel structure.
static int	ast_channel_best_codec (struct ast_channel *channel)
	Pick the best codec from channel nativeformats.
int	ast_channel_bridge (struct ast_channel c0, struct ast_channel c1, struct ast_bridge_config config, struct ast_frame fo, struct ast_channel *rc)
	Bridge two channels together.
int	ast_channel_cmpwhentohangup (struct ast_channel *chan, time_t offset)
	Compare a offset with the settings of when to hang a channel up.
int	ast_channel_datastore_add (struct ast_channel chan, struct ast_datastore datastore)
	Add a datastore to a channel.
ast_datastore *	ast_channel_datastore_alloc (const struct ast_datastore_info info, char uid)
	Create a channel datastore structure.
ast_datastore *	ast_channel_datastore_find (struct ast_channel chan, const struct ast_datastore_info info, char *uid)
	Find a datastore on a channel.
int	ast_channel_datastore_free (struct ast_datastore *datastore)
	Free a channel datastore structure.
int	ast_channel_datastore_remove (struct ast_channel chan, struct ast_datastore datastore)
	Remove a datastore from a channel.
int	ast_channel_defer_dtmf (struct ast_channel *chan)
	Set defer DTMF flag on channel.
static void	ast_channel_formats_reset (struct ast_channel *channel)
void	ast_channel_free (struct ast_channel *)
	Free a channel structure.
static const char *	ast_channel_getformatname (struct ast_channel *chan)
static char *	ast_channel_getformatname_multiple (char buf, size_t size, struct ast_channel chan)
	Get the names of a set of formats.
void	ast_channel_inherit_variables (const struct ast_channel parent, struct ast_channel child)
	Inherits channel variable from parent to child channel.
int	ast_channel_make_compatible (struct ast_channel c0, struct ast_channel c1)
	Makes two channel formats compatible.
int	ast_channel_masquerade (struct ast_channel original, struct ast_channel clone)
	Weird function made for call transfers.
ast_frame *	ast_channel_queryoption (struct ast_channel channel, int option, void data, int *datalen, int block)
int	ast_channel_register (const struct ast_channel_tech *tech)
	Register a channel technology (a new channel driver) Called by a channel module to register the kind of channels it supports.
int	ast_channel_sendhtml (struct ast_channel channel, int subclass, const char data, int datalen)
int	ast_channel_sendurl (struct ast_channel channel, const char url)
int	ast_channel_setoption (struct ast_channel channel, int option, void data, int datalen, int block)
	Sets an option on a channel.
void	ast_channel_setwhentohangup (struct ast_channel *chan, time_t offset)
	Set when to hang a channel up.
ast_silence_generator *	ast_channel_start_silence_generator (struct ast_channel *chan)
	Starts a silence generator on the given channel.
void	ast_channel_stop_silence_generator (struct ast_channel chan, struct ast_silence_generator state)
	Stops a previously-started silence generator on the given channel.
int	ast_channel_supports_html (struct ast_channel *channel)
void	ast_channel_undefer_dtmf (struct ast_channel *chan)
	Unset defer DTMF flag on channel.
void	ast_channel_unregister (const struct ast_channel_tech *tech)
	Unregister a channel technology.
ast_channel *	ast_channel_walk_locked (const struct ast_channel *prev)
	Browse channels in use Browse the channels currently in use.
int	ast_channel_whisper_feed (struct ast_channel chan, struct ast_frame f)
	Feed an audio frame into the whisper buffer on a channel.
int	ast_channel_whisper_start (struct ast_channel *chan)
	Begin 'whispering' onto a channel.
void	ast_channel_whisper_stop (struct ast_channel *chan)
	Stop 'whispering' onto a channel.
ast_variable *	ast_channeltype_list (void)
	return an ast_variable list of channeltypes
int	ast_check_hangup (struct ast_channel *chan)
	Check to see if a channel is needing hang up.
void	ast_deactivate_generator (struct ast_channel *chan)
int	ast_do_masquerade (struct ast_channel *chan)
	Start masquerading a channel XXX This is a seriously wacked out operation. We're essentially putting the guts of the clone channel into the original channel. Start by killing off the original channel's backend. I'm not sure we're going to keep this function, because while the features are nice, the cost is very high in terms of pure nastiness. XXX.
static int	ast_fdisset (struct pollfd pfds, int fd, int max, int start)
	Helper function for migrating select to poll.
ast_channel *	ast_get_channel_by_exten_locked (const char exten, const char context)
	Get channel by exten (and optionally context) and lock it.
ast_channel *	ast_get_channel_by_name_locked (const char *chan)
	Get channel by name (locks channel).
ast_channel *	ast_get_channel_by_name_prefix_locked (const char *name, const int namelen)
	Get channel by name prefix (locks channel).
ast_channel_tech *	ast_get_channel_tech (const char *name)
	Get a channel technology structure by name.
ast_group_t	ast_get_group (const char *s)
static int	ast_get_read_format (struct ast_channel *chan)
	Gets read format from channel chan.
static int	ast_get_write_format (struct ast_channel *chan)
int	ast_hangup (struct ast_channel *chan)
	Hang up a channel.
int	ast_indicate (struct ast_channel *chan, int condition)
	Indicates condition of channel.
int	ast_indicate_data (struct ast_channel chan, int condition, const void data, size_t datalen)
	Indicates condition of channel, with payload.
int	ast_internal_timing_enabled (struct ast_channel *chan)
	Check if the channel can run in internal timing mode.
char *	ast_print_group (char *buf, int buflen, ast_group_t group)
	print call- and pickup groups into buffer
int	ast_prod (struct ast_channel *chan)
	Send empty audio to prime a channel driver.
int	ast_queue_control (struct ast_channel *chan, enum ast_control_frame_type control)
	Queue a control frame with payload.
int	ast_queue_control_data (struct ast_channel chan, enum ast_control_frame_type control, const void data, size_t datalen)
	Queue a control frame with payload.
int	ast_queue_frame (struct ast_channel chan, struct ast_frame f)
	Queue an outgoing frame.
int	ast_queue_hangup (struct ast_channel *chan)
	Queue a hangup frame.
ast_frame *	ast_read (struct ast_channel *chan)
	Reads a frame.
ast_frame *	ast_read_noaudio (struct ast_channel *chan)
	Reads a frame, returning AST_FRAME_NULL frame if audio.
int	ast_readstring (struct ast_channel c, char s, int len, int timeout, int rtimeout, char *enders)
int	ast_readstring_full (struct ast_channel c, char s, int len, int timeout, int rtimeout, char *enders, int audiofd, int ctrlfd)
int	ast_recvchar (struct ast_channel *chan, int timeout)
	Receives a text character from a channel.
char *	ast_recvtext (struct ast_channel *chan, int timeout)
	Receives a text string from a channel Read a string of text from a channel.
ast_channel *	ast_request (const char type, int format, void data, int *status)
	Requests a channel.
ast_channel *	ast_request_and_dial (const char type, int format, void data, int timeout, int reason, const char cidnum, const char *cidname)
	Request a channel of a given type, with data as optional information used by the low level module and attempt to place a call on it.
static struct ast_channel *	ast_request_inherit (struct ast_channel chan, const char type, void data, int status)
	call ast_request with format/type of parent channel
int	ast_safe_sleep (struct ast_channel *chan, int ms)
	Wait for a specied amount of time, looking for hangups.
int	ast_safe_sleep_conditional (struct ast_channel chan, int ms, int(cond)(void ), void data)
	Wait for a specied amount of time, looking for hangups and a condition argument.
char *	ast_safe_string_alloc (const char *fmt,...)
	printf the string into a correctly sized mallocd buffer, and return the buffer
static int	ast_select (int nfds, fd_set rfds, fd_set wfds, fd_set efds, struct timeval tvp)
	Waits for activity on a group of channels.
int	ast_senddigit (struct ast_channel *chan, char digit)
	Send a DTMF digit to a channel Send a DTMF digit to a channel.
int	ast_senddigit_begin (struct ast_channel *chan, char digit)
	Send a DTMF digit to a channel Send a DTMF digit to a channel.
int	ast_senddigit_end (struct ast_channel *chan, char digit, unsigned int duration)
	Send a DTMF digit to a channel.
int	ast_sendtext (struct ast_channel chan, const char text)
	Sends text to a channel Write text to a display on a channel.
static void	ast_set_best_format (struct ast_channel *channel)
	Set best format, identical to read/write.
void	ast_set_callerid (struct ast_channel chan, const char cidnum, const char cidname, const char ani)
int	ast_set_read_format (struct ast_channel *chan, int format)
	Sets read format on channel chan Set read format for channel to whichever component of "format" is best.
void	ast_set_variables (struct ast_channel chan, struct ast_variable vars)
	adds a list of channel variables to a channel
int	ast_set_write_format (struct ast_channel *chan, int format)
	Sets write format on channel chan Set write format for channel to whichever compoent of "format" is best.
int	ast_setstate (struct ast_channel *chan, enum ast_channel_state)
	Change the state of a channel.
int	ast_settimeout (struct ast_channel c, int samples, int(func)(void data), void data)
int	ast_shutting_down (void)
	Returns non-zero if Asterisk is being shut down.
int	ast_softhangup (struct ast_channel *chan, int cause)
	Softly hangup up a channel.
int	ast_softhangup_nolock (struct ast_channel *chan, int cause)
	Softly hangup up a channel (no channel lock).
char *	ast_state2str (enum ast_channel_state)
	Gives the string form of a given channel state.
int	ast_str2cause (const char *name) attribute_pure
	Convert a symbolic hangup cause to number.
int	ast_tonepair (struct ast_channel *chan, int freq1, int freq2, int duration, int vol)
int	ast_tonepair_start (struct ast_channel *chan, int freq1, int freq2, int duration, int vol)
void	ast_tonepair_stop (struct ast_channel *chan)
int	ast_transfer (struct ast_channel chan, char dest)
	Transfer a channel (if supported). Returns -1 on error, 0 if not supported and 1 if supported and requested.
char *	ast_transfercapability2str (int transfercapability) attribute_const
	Gives the string form of a given transfer capability.
int	ast_waitfor (struct ast_channel *chan, int ms)
	Wait for input on a channel.
ast_channel *	ast_waitfor_n (struct ast_channel *chan, int n, int ms)
	Waits for input on a group of channels Wait for input on an array of channels for a given # of milliseconds.
int	ast_waitfor_n_fd (int fds, int n, int ms, int *exception)
	Waits for input on an fd This version works on fd's only. Be careful with it.
ast_channel *	ast_waitfor_nandfds (struct ast_channel *chan, int n, int fds, int nfds, int exception, int outfd, int *ms)
	Waits for activity on a group of channels.
int	ast_waitfordigit (struct ast_channel *c, int ms)
	Waits for a digit.
int	ast_waitfordigit_full (struct ast_channel *c, int ms, int audiofd, int ctrlfd)
	Wait for a digit Same as ast_waitfordigit() with audio fd for outputting read audio and ctrlfd to monitor for reading.
ast_channel *	ast_walk_channel_by_exten_locked (const struct ast_channel chan, const char exten, const char *context)
	Get next channel by exten (and optionally context) and lock it.
ast_channel *	ast_walk_channel_by_name_prefix_locked (const struct ast_channel chan, const char name, const int namelen)
	Get channel by name prefix (locks channel).
int	ast_write (struct ast_channel chan, struct ast_frame frame)
	Write a frame to a channel This function writes the given frame to the indicated channel.
int	ast_write_video (struct ast_channel chan, struct ast_frame frame)
	Write video frame to a channel This function writes the given frame to the indicated channel.
const char *	channelreloadreason2txt (enum channelreloadreason reason)
	Convert enum channelreloadreason to text string for manager event.