00001 /* 00002 * Asterisk -- An open source telephony toolkit. 00003 * 00004 * Copyright (C) 1999 - 2005, Digium, Inc. 00005 * 00006 * Mark Spencer <markster@digium.com> 00007 * 00008 * See http://www.asterisk.org for more information about 00009 * the Asterisk project. Please do not directly contact 00010 * any of the maintainers of this project for assistance; 00011 * the project provides a web site, mailing lists and IRC 00012 * channels for your use. 00013 * 00014 * This program is free software, distributed under the terms of 00015 * the GNU General Public License Version 2. See the LICENSE file 00016 * at the top of the source tree. 00017 */ 00018 00019 /*! \file 00020 * \brief General Asterisk PBX channel definitions. 00021 * \par See also: 00022 * \arg \ref Def_Channel 00023 * \arg \ref channel_drivers 00024 */ 00025 00026 /*! \page Def_Channel Asterisk Channels 00027 \par What is a Channel? 00028 A phone call through Asterisk consists of an incoming 00029 connection and an outbound connection. Each call comes 00030 in through a channel driver that supports one technology, 00031 like SIP, ZAP, IAX2 etc. 00032 \par 00033 Each channel driver, technology, has it's own private 00034 channel or dialog structure, that is technology-dependent. 00035 Each private structure is "owned" by a generic Asterisk 00036 channel structure, defined in channel.h and handled by 00037 channel.c . 00038 \par Call scenario 00039 This happens when an incoming call arrives to Asterisk 00040 -# Call arrives on a channel driver interface 00041 -# Channel driver creates a PBX channel and starts a 00042 pbx thread on the channel 00043 -# The dial plan is executed 00044 -# At this point at least two things can happen: 00045 -# The call is answered by Asterisk and 00046 Asterisk plays a media stream or reads media 00047 -# The dial plan forces Asterisk to create an outbound 00048 call somewhere with the dial (see \ref app_dial.c) 00049 application 00050 00051 . 00052 \par Bridging channels 00053 If Asterisk dials out this happens: 00054 -# Dial creates an outbound PBX channel and asks one of the 00055 channel drivers to create a call 00056 -# When the call is answered, Asterisk bridges the media streams 00057 so the caller on the first channel can speak with the callee 00058 on the second, outbound channel 00059 -# In some cases where we have the same technology on both 00060 channels and compatible codecs, a native bridge is used. 00061 In a native bridge, the channel driver handles forwarding 00062 of incoming audio to the outbound stream internally, without 00063 sending audio frames through the PBX. 00064 -# In SIP, theres an "external native bridge" where Asterisk 00065 redirects the endpoint, so audio flows directly between the 00066 caller's phone and the callee's phone. Signalling stays in 00067 Asterisk in order to be able to provide a proper CDR record 00068 for the call. 00069 00070 00071 \par Masquerading channels 00072 In some cases, a channel can masquerade itself into another 00073 channel. This happens frequently in call transfers, where 00074 a new channel takes over a channel that is already involved 00075 in a call. The new channel sneaks in and takes over the bridge 00076 and the old channel, now a zombie, is hung up. 00077 00078 \par Reference 00079 \arg channel.c - generic functions 00080 \arg channel.h - declarations of functions, flags and structures 00081 \arg \ref channel_drivers - Implemented channel drivers 00082 \arg \ref Def_Frame Asterisk Multimedia Frames 00083 00084 */ 00085 00086 #ifndef _ASTERISK_CHANNEL_H 00087 #define _ASTERISK_CHANNEL_H 00088 00089 #include <unistd.h> 00090 #include <setjmp.h> 00091 #ifdef POLLCOMPAT 00092 #include "asterisk/poll-compat.h" 00093 #else 00094 #include <sys/poll.h> 00095 #endif 00096 00097 #if defined(__cplusplus) || defined(c_plusplus) 00098 extern "C" { 00099 #endif 00100 00101 /*! Max length of an extension */ 00102 #define AST_MAX_EXTENSION 80 00103 00104 #define AST_MAX_CONTEXT 80 00105 00106 #define AST_CHANNEL_NAME 80 00107 00108 #include "asterisk/compat.h" 00109 #include "asterisk/frame.h" 00110 #include "asterisk/sched.h" 00111 #include "asterisk/chanvars.h" 00112 #include "asterisk/config.h" 00113 #include "asterisk/lock.h" 00114 #include "asterisk/cdr.h" 00115 #include "asterisk/utils.h" 00116 #include "asterisk/linkedlists.h" 00117 00118 #define MAX_LANGUAGE 20 00119 00120 #define MAX_MUSICCLASS 20 00121 00122 #define AST_MAX_FDS 8 00123 00124 enum ast_bridge_result { 00125 AST_BRIDGE_COMPLETE = 0, 00126 AST_BRIDGE_FAILED = -1, 00127 AST_BRIDGE_FAILED_NOWARN = -2, 00128 AST_BRIDGE_RETRY = -3, 00129 }; 00130 00131 typedef unsigned long long ast_group_t; 00132 00133 struct ast_generator { 00134 void *(*alloc)(struct ast_channel *chan, void *params); 00135 void (*release)(struct ast_channel *chan, void *data); 00136 int (*generate)(struct ast_channel *chan, void *data, int len, int samples); 00137 }; 00138 00139 /*! Structure for all kinds of caller ID identifications */ 00140 struct ast_callerid { 00141 /*! Malloc'd Dialed Number Identifier */ 00142 char *cid_dnid; 00143 /*! Malloc'd Caller Number */ 00144 char *cid_num; 00145 /*! Malloc'd Caller Name */ 00146 char *cid_name; 00147 /*! Malloc'd ANI */ 00148 char *cid_ani; 00149 /*! Malloc'd RDNIS */ 00150 char *cid_rdnis; 00151 /*! Callerid presentation/screening */ 00152 int cid_pres; 00153 /*! Callerid ANI 2 (Info digits) */ 00154 int cid_ani2; 00155 /*! Callerid Type of Number */ 00156 int cid_ton; 00157 /*! Callerid Transit Network Select */ 00158 int cid_tns; 00159 }; 00160 00161 /*! Structure to describe a channel "technology", ie a channel driver 00162 See 00163 \arg chan_iax2.c - The Inter-Asterisk exchange protocol 00164 \arg chan_sip.c - The SIP channel driver 00165 \arg chan_zap.c - PSTN connectivity (TDM, PRI, T1/E1, FXO, FXS) 00166 00167 If you develop your own channel driver, this is where you 00168 tell the PBX at registration of your driver what properties 00169 this driver supports and where different callbacks are 00170 implemented. 00171 */ 00172 00173 00174 struct ast_channel_tech { 00175 const char * const type; 00176 const char * const description; 00177 00178 /*! Bitmap of formats this channel can handle */ 00179 int capabilities; 00180 00181 /*! Technology Properties */ 00182 int properties; 00183 00184 /*! Requester - to set up call data structures (pvt's) */ 00185 struct ast_channel *(* const requester)(const char *type, int format, void *data, int *cause); 00186 00187 /*! Devicestate call back */ 00188 int (* const devicestate)(void *data); 00189 00190 /*! Send a literal DTMF digit */ 00191 int (* const send_digit)(struct ast_channel *chan, char digit); 00192 00193 /*! Call a given phone number (address, etc), but don't 00194 take longer than timeout seconds to do so. */ 00195 int (* const call)(struct ast_channel *chan, char *addr, int timeout); 00196 00197 /*! Hangup (and possibly destroy) the channel */ 00198 int (* const hangup)(struct ast_channel *chan); 00199 00200 /*! Answer the channel */ 00201 int (* const answer)(struct ast_channel *chan); 00202 00203 /*! Read a frame, in standard format (see frame.h) */ 00204 struct ast_frame * (* const read)(struct ast_channel *chan); 00205 00206 /*! Write a frame, in standard format (see frame.h) */ 00207 int (* const write)(struct ast_channel *chan, struct ast_frame *frame); 00208 00209 /*! Display or transmit text */ 00210 int (* const send_text)(struct ast_channel *chan, const char *text); 00211 00212 /*! Display or send an image */ 00213 int (* const send_image)(struct ast_channel *chan, struct ast_frame *frame); 00214 00215 /*! Send HTML data */ 00216 int (* const send_html)(struct ast_channel *chan, int subclass, const char *data, int len); 00217 00218 /*! Handle an exception, reading a frame */ 00219 struct ast_frame * (* const exception)(struct ast_channel *chan); 00220 00221 /*! Bridge two channels of the same type together */ 00222 enum ast_bridge_result (* const bridge)(struct ast_channel *c0, struct ast_channel *c1, int flags, 00223 struct ast_frame **fo, struct ast_channel **rc, int timeoutms); 00224 00225 /*! Indicate a particular condition (e.g. AST_CONTROL_BUSY or AST_CONTROL_RINGING or AST_CONTROL_CONGESTION */ 00226 int (* const indicate)(struct ast_channel *c, int condition); 00227 00228 /*! Fix up a channel: If a channel is consumed, this is called. Basically update any ->owner links */ 00229 int (* const fixup)(struct ast_channel *oldchan, struct ast_channel *newchan); 00230 00231 /*! Set a given option */ 00232 int (* const setoption)(struct ast_channel *chan, int option, void *data, int datalen); 00233 00234 /*! Query a given option */ 00235 int (* const queryoption)(struct ast_channel *chan, int option, void *data, int *datalen); 00236 00237 /*! Blind transfer other side (see app_transfer.c and ast_transfer() */ 00238 int (* const transfer)(struct ast_channel *chan, const char *newdest); 00239 00240 /*! Write a frame, in standard format */ 00241 int (* const write_video)(struct ast_channel *chan, struct ast_frame *frame); 00242 00243 /*! Find bridged channel */ 00244 struct ast_channel *(* const bridged_channel)(struct ast_channel *chan, struct ast_channel *bridge); 00245 }; 00246 00247 struct ast_channel_spy_list; 00248 00249 /*! Main Channel structure associated with a channel. 00250 * This is the side of it mostly used by the pbx and call management. 00251 */ 00252 struct ast_channel { 00253 /*! ASCII unique channel name */ 00254 char name[AST_CHANNEL_NAME]; 00255 00256 /*! Technology (point to channel driver) */ 00257 const struct ast_channel_tech *tech; 00258 00259 /*! Private data used by the technology driver */ 00260 void *tech_pvt; 00261 00262 /*! Language requested for voice prompts */ 00263 char language[MAX_LANGUAGE]; 00264 /*! Type of channel */ 00265 const char *type; 00266 /*! File descriptor for channel -- Drivers will poll on these file descriptors, so at least one must be non -1. */ 00267 int fds[AST_MAX_FDS]; 00268 00269 /*! Default music class */ 00270 char musicclass[MAX_MUSICCLASS]; 00271 /*! Music State*/ 00272 void *music_state; 00273 /*! Current generator data if there is any */ 00274 void *generatordata; 00275 /*! Current active data generator */ 00276 struct ast_generator *generator; 00277 00278 /*! Who are we bridged to, if we're bridged. Who is proxying for us, 00279 if we are proxied (i.e. chan_agent). 00280 Do not access directly, use ast_bridged_channel(chan) */ 00281 struct ast_channel *_bridge; 00282 /*! Channel that will masquerade as us */ 00283 struct ast_channel *masq; 00284 /*! Who we are masquerading as */ 00285 struct ast_channel *masqr; 00286 /*! Call Detail Record Flags */ 00287 int cdrflags; 00288 /*! Whether or not we have been hung up... Do not set this value 00289 directly, use ast_softhangup */ 00290 int _softhangup; 00291 /*! Non-zero, set to actual time when channel is to be hung up */ 00292 time_t whentohangup; 00293 /*! If anyone is blocking, this is them */ 00294 pthread_t blocker; 00295 /*! Lock, can be used to lock a channel for some operations */ 00296 ast_mutex_t lock; 00297 /*! Procedure causing blocking */ 00298 const char *blockproc; 00299 00300 /*! Current application */ 00301 char *appl; 00302 /*! Data passed to current application */ 00303 char *data; 00304 00305 /*! Which fd had an event detected on */ 00306 int fdno; 00307 /*! Schedule context */ 00308 struct sched_context *sched; 00309 /*! For streaming playback, the schedule ID */ 00310 int streamid; 00311 /*! Stream itself. */ 00312 struct ast_filestream *stream; 00313 /*! For streaming video playback, the schedule ID */ 00314 int vstreamid; 00315 /*! Video Stream itself. */ 00316 struct ast_filestream *vstream; 00317 /*! Original writer format */ 00318 int oldwriteformat; 00319 00320 /*! Timing fd */ 00321 int timingfd; 00322 int (*timingfunc)(void *data); 00323 void *timingdata; 00324 00325 /*! State of line -- Don't write directly, use ast_setstate */ 00326 int _state; 00327 /*! Number of rings so far */ 00328 int rings; 00329 00330 /*! Kinds of data this channel can natively handle */ 00331 int nativeformats; 00332 /*! Requested read format */ 00333 int readformat; 00334 /*! Requested write format */ 00335 int writeformat; 00336 00337 struct ast_callerid cid; 00338 00339 /*! Current extension context */ 00340 char context[AST_MAX_CONTEXT]; 00341 /*! Current non-macro context */ 00342 char macrocontext[AST_MAX_CONTEXT]; 00343 /*! Current non-macro extension */ 00344 char macroexten[AST_MAX_EXTENSION]; 00345 /*! Current non-macro priority */ 00346 int macropriority; 00347 /*! Current extension number */ 00348 char exten[AST_MAX_EXTENSION]; 00349 /* Current extension priority */ 00350 int priority; 00351 /*! Any/all queued DTMF characters */ 00352 char dtmfq[AST_MAX_EXTENSION]; 00353 /*! DTMF frame */ 00354 struct ast_frame dtmff; 00355 00356 /*! PBX private structure */ 00357 struct ast_pbx *pbx; 00358 /*! Set BEFORE PBX is started to determine AMA flags */ 00359 int amaflags; 00360 /*! Account code for billing */ 00361 char accountcode[AST_MAX_ACCOUNT_CODE]; 00362 /*! Call Detail Record */ 00363 struct ast_cdr *cdr; 00364 /*! Whether or not ADSI is detected on CPE */ 00365 int adsicpe; 00366 /*! Where to forward to if asked to dial on this interface */ 00367 char call_forward[AST_MAX_EXTENSION]; 00368 00369 /*! Tone zone as set in indications.conf */ 00370 struct tone_zone *zone; 00371 00372 /* Channel monitoring */ 00373 struct ast_channel_monitor *monitor; 00374 00375 /*! Track the read/written samples for monitor use */ 00376 unsigned long insmpl; 00377 unsigned long outsmpl; 00378 00379 /* Frames in/out counters */ 00380 unsigned int fin; 00381 unsigned int fout; 00382 00383 /* Unique Channel Identifier */ 00384 char uniqueid[32]; 00385 00386 /* Why is the channel hanged up */ 00387 int hangupcause; 00388 00389 /* A linked list for variables */ 00390 struct varshead varshead; 00391 00392 ast_group_t callgroup; 00393 ast_group_t pickupgroup; 00394 00395 /*! channel flags of AST_FLAG_ type */ 00396 unsigned int flags; 00397 00398 /*! ISDN Transfer Capbility - AST_FLAG_DIGITAL is not enough */ 00399 unsigned short transfercapability; 00400 00401 struct ast_frame *readq; 00402 int alertpipe[2]; 00403 /*! Write translation path */ 00404 struct ast_trans_pvt *writetrans; 00405 /*! Read translation path */ 00406 struct ast_trans_pvt *readtrans; 00407 /*! Raw read format */ 00408 int rawreadformat; 00409 /*! Raw write format */ 00410 int rawwriteformat; 00411 00412 /*! Chan Spy stuff */ 00413 struct ast_channel_spy_list *spies; 00414 00415 /*! For easy linking */ 00416 struct ast_channel *next; 00417 }; 00418 00419 /* \defgroup chanprop Channel tech properties: 00420 \brief Channels have this property if they can accept input with jitter; i.e. most VoIP channels */ 00421 /* @{ */ 00422 #define AST_CHAN_TP_WANTSJITTER (1 << 0) 00423 00424 /* This flag has been deprecated by the transfercapbilty data member in struct ast_channel */ 00425 /* #define AST_FLAG_DIGITAL (1 << 0) */ /* if the call is a digital ISDN call */ 00426 #define AST_FLAG_DEFER_DTMF (1 << 1) /*!< if dtmf should be deferred */ 00427 #define AST_FLAG_WRITE_INT (1 << 2) /*!< if write should be interrupt generator */ 00428 #define AST_FLAG_BLOCKING (1 << 3) /*!< if we are blocking */ 00429 #define AST_FLAG_ZOMBIE (1 << 4) /*!< if we are a zombie */ 00430 #define AST_FLAG_EXCEPTION (1 << 5) /*!< if there is a pending exception */ 00431 #define AST_FLAG_MOH (1 << 6) /*!< XXX anthm promises me this will disappear XXX listening to moh */ 00432 #define AST_FLAG_SPYING (1 << 7) /*!< XXX might also go away XXX is spying on someone */ 00433 #define AST_FLAG_NBRIDGE (1 << 8) /*!< is it in a native bridge */ 00434 #define AST_FLAG_IN_AUTOLOOP (1 << 9) /*!< the channel is in an auto-incrementing dialplan processor, 00435 so when ->priority is set, it will get incremented before 00436 finding the next priority to run 00437 */ 00438 /* @} */ 00439 00440 #define AST_FEATURE_PLAY_WARNING (1 << 0) 00441 #define AST_FEATURE_REDIRECT (1 << 1) 00442 #define AST_FEATURE_DISCONNECT (1 << 2) 00443 #define AST_FEATURE_ATXFER (1 << 3) 00444 #define AST_FEATURE_AUTOMON (1 << 4) 00445 00446 #define AST_FEATURE_FLAG_NEEDSDTMF (1 << 0) 00447 #define AST_FEATURE_FLAG_CALLEE (1 << 1) 00448 #define AST_FEATURE_FLAG_CALLER (1 << 2) 00449 00450 struct ast_bridge_config { 00451 struct ast_flags features_caller; 00452 struct ast_flags features_callee; 00453 struct timeval start_time; 00454 long feature_timer; 00455 long timelimit; 00456 long play_warning; 00457 long warning_freq; 00458 char *warning_sound; 00459 char *end_sound; 00460 char *start_sound; 00461 int firstpass; 00462 unsigned int flags; 00463 }; 00464 00465 struct chanmon; 00466 00467 #define LOAD_OH(oh) { \ 00468 oh.context = context; \ 00469 oh.exten = exten; \ 00470 oh.priority = priority; \ 00471 oh.cid_num = cid_num; \ 00472 oh.cid_name = cid_name; \ 00473 oh.account = account; \ 00474 oh.vars = vars; \ 00475 oh.parent_channel = NULL; \ 00476 } 00477 00478 struct outgoing_helper { 00479 const char *context; 00480 const char *exten; 00481 int priority; 00482 const char *cid_num; 00483 const char *cid_name; 00484 const char *account; 00485 struct ast_variable *vars; 00486 struct ast_channel *parent_channel; 00487 }; 00488 00489 #define AST_CDR_TRANSFER (1 << 0) 00490 #define AST_CDR_FORWARD (1 << 1) 00491 #define AST_CDR_CALLWAIT (1 << 2) 00492 #define AST_CDR_CONFERENCE (1 << 3) 00493 00494 #define AST_ADSI_UNKNOWN (0) 00495 #define AST_ADSI_AVAILABLE (1) 00496 #define AST_ADSI_UNAVAILABLE (2) 00497 #define AST_ADSI_OFFHOOKONLY (3) 00498 00499 #define AST_SOFTHANGUP_DEV (1 << 0) /*!< Soft hangup by device */ 00500 #define AST_SOFTHANGUP_ASYNCGOTO (1 << 1) /*!< Soft hangup for async goto */ 00501 #define AST_SOFTHANGUP_SHUTDOWN (1 << 2) 00502 #define AST_SOFTHANGUP_TIMEOUT (1 << 3) 00503 #define AST_SOFTHANGUP_APPUNLOAD (1 << 4) 00504 #define AST_SOFTHANGUP_EXPLICIT (1 << 5) 00505 #define AST_SOFTHANGUP_UNBRIDGE (1 << 6) 00506 00507 00508 /*! \defgroup ChanState Channel states 00509 \brief Bits 0-15 of state are reserved for the state (up/down) of the line */ 00510 /*! @{ */ 00511 /*! Channel is down and available */ 00512 #define AST_STATE_DOWN 0 00513 /*! Channel is down, but reserved */ 00514 #define AST_STATE_RESERVED 1 00515 /*! Channel is off hook */ 00516 #define AST_STATE_OFFHOOK 2 00517 /*! Digits (or equivalent) have been dialed */ 00518 #define AST_STATE_DIALING 3 00519 /*! Line is ringing */ 00520 #define AST_STATE_RING 4 00521 /*! Remote end is ringing */ 00522 #define AST_STATE_RINGING 5 00523 /*! Line is up */ 00524 #define AST_STATE_UP 6 00525 /*! Line is busy */ 00526 #define AST_STATE_BUSY 7 00527 /*! Digits (or equivalent) have been dialed while offhook */ 00528 #define AST_STATE_DIALING_OFFHOOK 8 00529 /*! Channel has detected an incoming call and is waiting for ring */ 00530 #define AST_STATE_PRERING 9 00531 00532 /* Bits 16-32 of state are reserved for flags (See \ref ChanState ) */ 00533 /*! Do not transmit voice data */ 00534 #define AST_STATE_MUTE (1 << 16) 00535 /*! @} */ 00536 00537 /*! \brief Change the state of a channel */ 00538 int ast_setstate(struct ast_channel *chan, int state); 00539 00540 /*! \brief Create a channel structure 00541 \return Returns NULL on failure to allocate. 00542 \note New channels are 00543 by default set to the "default" context and 00544 extension "s" 00545 */ 00546 struct ast_channel *ast_channel_alloc(int needalertpipe); 00547 00548 /*! \brief Queue an outgoing frame */ 00549 int ast_queue_frame(struct ast_channel *chan, struct ast_frame *f); 00550 00551 /*! \brief Queue a hangup frame */ 00552 int ast_queue_hangup(struct ast_channel *chan); 00553 00554 /*! \brief Queue a control frame */ 00555 int ast_queue_control(struct ast_channel *chan, int control); 00556 00557 00558 /*! \brief Change channel name */ 00559 void ast_change_name(struct ast_channel *chan, char *newname); 00560 00561 /*! \brief Free a channel structure */ 00562 void ast_channel_free(struct ast_channel *); 00563 00564 /*! \brief Requests a channel 00565 * \param type type of channel to request 00566 * \param format requested channel format 00567 * \param data data to pass to the channel requester 00568 * \param status status 00569 * Request a channel of a given type, with data as optional information used 00570 * by the low level module 00571 * \return Returns an ast_channel on success, NULL on failure. 00572 */ 00573 struct ast_channel *ast_request(const char *type, int format, void *data, int *status); 00574 00575 /*! 00576 * \brief Request a channel of a given type, with data as optional information used 00577 * by the low level module and attempt to place a call on it 00578 * \param type type of channel to request 00579 * \param format requested channel format 00580 * \param data data to pass to the channel requester 00581 * \param timeout maximum amount of time to wait for an answer 00582 * \param reason why unsuccessful (if unsuceessful) 00583 * \param cidnum Caller-ID Number 00584 * \param cidname Caller-ID Name 00585 * \return Returns an ast_channel on success or no answer, NULL on failure. Check the value of chan->_state 00586 * to know if the call was answered or not. 00587 */ 00588 struct ast_channel *ast_request_and_dial(const char *type, int format, void *data, int timeout, int *reason, const char *cidnum, const char *cidname); 00589 00590 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); 00591 00592 /*!\brief Register a channel technology (a new channel driver) 00593 * Called by a channel module to register the kind of channels it supports. 00594 * \param tech Structure defining channel technology or "type" 00595 * \return Returns 0 on success, -1 on failure. 00596 */ 00597 int ast_channel_register(const struct ast_channel_tech *tech); 00598 00599 /*! \brief Unregister a channel technology 00600 * \param tech Structure defining channel technology or "type" that was previously registered 00601 * \return No return value. 00602 */ 00603 void ast_channel_unregister(const struct ast_channel_tech *tech); 00604 00605 /*! \brief Get a channel technology structure by name 00606 * \param name name of technology to find 00607 * \return a pointer to the structure, or NULL if no matching technology found 00608 */ 00609 const struct ast_channel_tech *ast_get_channel_tech(const char *name); 00610 00611 /*! \brief Hang up a channel 00612 * \note This function performs a hard hangup on a channel. Unlike the soft-hangup, this function 00613 * performs all stream stopping, etc, on the channel that needs to end. 00614 * chan is no longer valid after this call. 00615 * \param chan channel to hang up 00616 * \return Returns 0 on success, -1 on failure. 00617 */ 00618 int ast_hangup(struct ast_channel *chan); 00619 00620 /*! \brief Softly hangup up a channel 00621 * \param chan channel to be soft-hung-up 00622 * Call the protocol layer, but don't destroy the channel structure (use this if you are trying to 00623 * safely hangup a channel managed by another thread. 00624 * \param cause Ast hangupcause for hangup 00625 * \return Returns 0 regardless 00626 */ 00627 int ast_softhangup(struct ast_channel *chan, int cause); 00628 00629 /*! \brief Softly hangup up a channel (no channel lock) 00630 * \param chan channel to be soft-hung-up 00631 * \param cause Ast hangupcause for hangup (see cause.h) */ 00632 int ast_softhangup_nolock(struct ast_channel *chan, int cause); 00633 00634 /*! \brief Check to see if a channel is needing hang up 00635 * \param chan channel on which to check for hang up 00636 * This function determines if the channel is being requested to be hung up. 00637 * \return Returns 0 if not, or 1 if hang up is requested (including time-out). 00638 */ 00639 int ast_check_hangup(struct ast_channel *chan); 00640 00641 /*! \brief Compare a offset with the settings of when to hang a channel up 00642 * \param chan channel on which to check for hang up 00643 * \param offset offset in seconds from current time 00644 * \return 1, 0, or -1 00645 * This function compares a offset from current time with the absolute time 00646 * out on a channel (when to hang up). If the absolute time out on a channel 00647 * is earlier than current time plus the offset, it returns 1, if the two 00648 * time values are equal, it return 0, otherwise, it retturn -1. 00649 */ 00650 int ast_channel_cmpwhentohangup(struct ast_channel *chan, time_t offset); 00651 00652 /*! \brief Set when to hang a channel up 00653 * \param chan channel on which to check for hang up 00654 * \param offset offset in seconds from current time of when to hang up 00655 * This function sets the absolute time out on a channel (when to hang up). 00656 */ 00657 void ast_channel_setwhentohangup(struct ast_channel *chan, time_t offset); 00658 00659 /*! \brief Answer a ringing call 00660 * \param chan channel to answer 00661 * This function answers a channel and handles all necessary call 00662 * setup functions. 00663 * \return Returns 0 on success, -1 on failure 00664 */ 00665 int ast_answer(struct ast_channel *chan); 00666 00667 /*! \brief Make a call 00668 * \param chan which channel to make the call on 00669 * \param addr destination of the call 00670 * \param timeout time to wait on for connect 00671 * Place a call, take no longer than timeout ms. 00672 \return Returns -1 on failure, 0 on not enough time 00673 (does not automatically stop ringing), and 00674 the number of seconds the connect took otherwise. 00675 */ 00676 int ast_call(struct ast_channel *chan, char *addr, int timeout); 00677 00678 /*! \brief Indicates condition of channel 00679 * \note Indicate a condition such as AST_CONTROL_BUSY, AST_CONTROL_RINGING, or AST_CONTROL_CONGESTION on a channel 00680 * \param chan channel to change the indication 00681 * \param condition which condition to indicate on the channel 00682 * \return Returns 0 on success, -1 on failure 00683 */ 00684 int ast_indicate(struct ast_channel *chan, int condition); 00685 00686 /* Misc stuff ------------------------------------------------ */ 00687 00688 /*! \brief Wait for input on a channel 00689 * \param chan channel to wait on 00690 * \param ms length of time to wait on the channel 00691 * Wait for input on a channel for a given # of milliseconds (<0 for indefinite). 00692 \return Returns < 0 on failure, 0 if nothing ever arrived, and the # of ms remaining otherwise */ 00693 int ast_waitfor(struct ast_channel *chan, int ms); 00694 00695 /*! \brief Wait for a specied amount of time, looking for hangups 00696 * \param chan channel to wait for 00697 * \param ms length of time in milliseconds to sleep 00698 * Waits for a specified amount of time, servicing the channel as required. 00699 * \return returns -1 on hangup, otherwise 0. 00700 */ 00701 int ast_safe_sleep(struct ast_channel *chan, int ms); 00702 00703 /*! \brief Wait for a specied amount of time, looking for hangups and a condition argument 00704 * \param chan channel to wait for 00705 * \param ms length of time in milliseconds to sleep 00706 * \param cond a function pointer for testing continue condition 00707 * \param data argument to be passed to the condition test function 00708 * \return returns -1 on hangup, otherwise 0. 00709 * Waits for a specified amount of time, servicing the channel as required. If cond 00710 * returns 0, this function returns. 00711 */ 00712 int ast_safe_sleep_conditional(struct ast_channel *chan, int ms, int (*cond)(void*), void *data ); 00713 00714 /*! \brief Waits for activity on a group of channels 00715 * \param chan an array of pointers to channels 00716 * \param n number of channels that are to be waited upon 00717 * \param fds an array of fds to wait upon 00718 * \param nfds the number of fds to wait upon 00719 * \param exception exception flag 00720 * \param outfd fd that had activity on it 00721 * \param ms how long the wait was 00722 * Big momma function here. Wait for activity on any of the n channels, or any of the nfds 00723 file descriptors. 00724 \return Returns the channel with activity, or NULL on error or if an FD 00725 came first. If the FD came first, it will be returned in outfd, otherwise, outfd 00726 will be -1 */ 00727 struct ast_channel *ast_waitfor_nandfds(struct ast_channel **chan, int n, int *fds, int nfds, int *exception, int *outfd, int *ms); 00728 00729 /*! Waits for input on a group of channels */ 00730 /*! Wait for input on an array of channels for a given # of milliseconds. Return channel 00731 with activity, or NULL if none has activity. time "ms" is modified in-place, if applicable */ 00732 struct ast_channel *ast_waitfor_n(struct ast_channel **chan, int n, int *ms); 00733 00734 /*! Waits for input on an fd */ 00735 /*! This version works on fd's only. Be careful with it. */ 00736 int ast_waitfor_n_fd(int *fds, int n, int *ms, int *exception); 00737 00738 00739 /*! Reads a frame */ 00740 /*! 00741 * \param chan channel to read a frame from 00742 * Read a frame. Returns a frame, or NULL on error. If it returns NULL, you 00743 best just stop reading frames and assume the channel has been 00744 disconnected. */ 00745 struct ast_frame *ast_read(struct ast_channel *chan); 00746 00747 /*! Write a frame to a channel */ 00748 /*! 00749 * \param chan destination channel of the frame 00750 * \param frame frame that will be written 00751 * This function writes the given frame to the indicated channel. 00752 * It returns 0 on success, -1 on failure. 00753 */ 00754 int ast_write(struct ast_channel *chan, struct ast_frame *frame); 00755 00756 /*! Write video frame to a channel */ 00757 /*! 00758 * \param chan destination channel of the frame 00759 * \param frame frame that will be written 00760 * This function writes the given frame to the indicated channel. 00761 * It returns 1 on success, 0 if not implemented, and -1 on failure. 00762 */ 00763 int ast_write_video(struct ast_channel *chan, struct ast_frame *frame); 00764 00765 /* Send empty audio to prime a channel driver */ 00766 int ast_prod(struct ast_channel *chan); 00767 00768 /*! Sets read format on channel chan */ 00769 /*! 00770 * \param chan channel to change 00771 * \param format format to change to 00772 * Set read format for channel to whichever component of "format" is best. 00773 * Returns 0 on success, -1 on failure 00774 */ 00775 int ast_set_read_format(struct ast_channel *chan, int format); 00776 00777 /*! Sets write format on channel chan */ 00778 /*! 00779 * \param chan channel to change 00780 * \param format new format for writing 00781 * Set write format for channel to whichever compoent of "format" is best. 00782 * Returns 0 on success, -1 on failure 00783 */ 00784 int ast_set_write_format(struct ast_channel *chan, int format); 00785 00786 /*! Sends text to a channel */ 00787 /*! 00788 * \param chan channel to act upon 00789 * \param text string of text to send on the channel 00790 * Write text to a display on a channel 00791 * Returns 0 on success, -1 on failure 00792 */ 00793 int ast_sendtext(struct ast_channel *chan, const char *text); 00794 00795 /*! Receives a text character from a channel */ 00796 /*! 00797 * \param chan channel to act upon 00798 * \param timeout timeout in milliseconds (0 for infinite wait) 00799 * Read a char of text from a channel 00800 * Returns 0 on success, -1 on failure 00801 */ 00802 int ast_recvchar(struct ast_channel *chan, int timeout); 00803 00804 /*! Send a DTMF digit to a channel */ 00805 /*! 00806 * \param chan channel to act upon 00807 * \param digit the DTMF digit to send, encoded in ASCII 00808 * Send a DTMF digit to a channel. 00809 * Returns 0 on success, -1 on failure 00810 */ 00811 int ast_senddigit(struct ast_channel *chan, char digit); 00812 00813 /*! Receives a text string from a channel */ 00814 /*! 00815 * \param chan channel to act upon 00816 * \param timeout timeout in milliseconds (0 for infinite wait) 00817 * \return the received text, or NULL to signify failure. 00818 * Read a string of text from a channel 00819 */ 00820 char *ast_recvtext(struct ast_channel *chan, int timeout); 00821 00822 /*! Browse channels in use */ 00823 /*! 00824 * \param prev where you want to start in the channel list 00825 * Browse the channels currently in use 00826 * Returns the next channel in the list, NULL on end. 00827 * If it returns a channel, that channel *has been locked*! 00828 */ 00829 struct ast_channel *ast_channel_walk_locked(const struct ast_channel *prev); 00830 00831 /*! Get channel by name (locks channel) */ 00832 struct ast_channel *ast_get_channel_by_name_locked(const char *chan); 00833 00834 /*! Get channel by name prefix (locks channel) */ 00835 struct ast_channel *ast_get_channel_by_name_prefix_locked(const char *name, const int namelen); 00836 00837 /*! Get channel by name prefix (locks channel) */ 00838 struct ast_channel *ast_walk_channel_by_name_prefix_locked(struct ast_channel *chan, const char *name, const int namelen); 00839 00840 /*--- ast_get_channel_by_exten_locked: Get channel by exten (and optionally context) and lock it */ 00841 struct ast_channel *ast_get_channel_by_exten_locked(const char *exten, const char *context); 00842 00843 /*! Waits for a digit */ 00844 /*! 00845 * \param c channel to wait for a digit on 00846 * \param ms how many milliseconds to wait 00847 * Wait for a digit. Returns <0 on error, 0 on no entry, and the digit on success. */ 00848 int ast_waitfordigit(struct ast_channel *c, int ms); 00849 00850 /* Same as above with audio fd for outputing read audio and ctrlfd to monitor for 00851 reading. Returns 1 if ctrlfd becomes available */ 00852 int ast_waitfordigit_full(struct ast_channel *c, int ms, int audiofd, int ctrlfd); 00853 00854 /*! Reads multiple digits */ 00855 /*! 00856 * \param c channel to read from 00857 * \param s string to read in to. Must be at least the size of your length 00858 * \param len how many digits to read (maximum) 00859 * \param timeout how long to timeout between digits 00860 * \param rtimeout timeout to wait on the first digit 00861 * \param enders digits to end the string 00862 * Read in a digit string "s", max length "len", maximum timeout between 00863 digits "timeout" (-1 for none), terminated by anything in "enders". Give them rtimeout 00864 for the first digit. Returns 0 on normal return, or 1 on a timeout. In the case of 00865 a timeout, any digits that were read before the timeout will still be available in s. 00866 RETURNS 2 in full version when ctrlfd is available, NOT 1*/ 00867 int ast_readstring(struct ast_channel *c, char *s, int len, int timeout, int rtimeout, char *enders); 00868 int ast_readstring_full(struct ast_channel *c, char *s, int len, int timeout, int rtimeout, char *enders, int audiofd, int ctrlfd); 00869 00870 /*! Report DTMF on channel 0 */ 00871 #define AST_BRIDGE_DTMF_CHANNEL_0 (1 << 0) 00872 /*! Report DTMF on channel 1 */ 00873 #define AST_BRIDGE_DTMF_CHANNEL_1 (1 << 1) 00874 /*! Return all voice frames on channel 0 */ 00875 #define AST_BRIDGE_REC_CHANNEL_0 (1 << 2) 00876 /*! Return all voice frames on channel 1 */ 00877 #define AST_BRIDGE_REC_CHANNEL_1 (1 << 3) 00878 /*! Ignore all signal frames except NULL */ 00879 #define AST_BRIDGE_IGNORE_SIGS (1 << 4) 00880 00881 00882 /*! Makes two channel formats compatible */ 00883 /*! 00884 * \param c0 first channel to make compatible 00885 * \param c1 other channel to make compatible 00886 * Set two channels to compatible formats -- call before ast_channel_bridge in general . Returns 0 on success 00887 and -1 if it could not be done */ 00888 int ast_channel_make_compatible(struct ast_channel *c0, struct ast_channel *c1); 00889 00890 /*! Bridge two channels together */ 00891 /*! 00892 * \param c0 first channel to bridge 00893 * \param c1 second channel to bridge 00894 * \param config config for the channels 00895 * \param fo destination frame(?) 00896 * \param rc destination channel(?) 00897 * Bridge two channels (c0 and c1) together. If an important frame occurs, we return that frame in 00898 *rf (remember, it could be NULL) and which channel (0 or 1) in rc */ 00899 /* int ast_channel_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc); */ 00900 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); 00901 00902 /*! Weird function made for call transfers */ 00903 /*! 00904 * \param original channel to make a copy of 00905 * \param clone copy of the original channel 00906 * This is a very strange and freaky function used primarily for transfer. Suppose that 00907 "original" and "clone" are two channels in random situations. This function takes 00908 the guts out of "clone" and puts them into the "original" channel, then alerts the 00909 channel driver of the change, asking it to fixup any private information (like the 00910 p->owner pointer) that is affected by the change. The physical layer of the original 00911 channel is hung up. */ 00912 int ast_channel_masquerade(struct ast_channel *original, struct ast_channel *clone); 00913 00914 /*! Gives the string form of a given cause code */ 00915 /*! 00916 * \param state cause to get the description of 00917 * Give a name to a cause code 00918 * Returns the text form of the binary cause code given 00919 */ 00920 const char *ast_cause2str(int state); 00921 00922 /*! Gives the string form of a given channel state */ 00923 /*! 00924 * \param state state to get the name of 00925 * Give a name to a state 00926 * Returns the text form of the binary state given 00927 */ 00928 char *ast_state2str(int state); 00929 00930 /*! Gives the string form of a given transfer capability */ 00931 /*! 00932 * \param transfercapability transfercapabilty to get the name of 00933 * Give a name to a transfercapbility 00934 * See above 00935 * Returns the text form of the binary transfer capbility 00936 */ 00937 char *ast_transfercapability2str(int transfercapability); 00938 00939 /* Options: Some low-level drivers may implement "options" allowing fine tuning of the 00940 low level channel. See frame.h for options. Note that many channel drivers may support 00941 none or a subset of those features, and you should not count on this if you want your 00942 asterisk application to be portable. They're mainly useful for tweaking performance */ 00943 00944 /*! Sets an option on a channel */ 00945 /*! 00946 * \param channel channel to set options on 00947 * \param option option to change 00948 * \param data data specific to option 00949 * \param datalen length of the data 00950 * \param block blocking or not 00951 * Set an option on a channel (see frame.h), optionally blocking awaiting the reply 00952 * Returns 0 on success and -1 on failure 00953 */ 00954 int ast_channel_setoption(struct ast_channel *channel, int option, void *data, int datalen, int block); 00955 00956 /*! Pick the best codec */ 00957 /* Choose the best codec... Uhhh... Yah. */ 00958 extern int ast_best_codec(int fmts); 00959 00960 00961 /*! Checks the value of an option */ 00962 /*! 00963 * Query the value of an option, optionally blocking until a reply is received 00964 * Works similarly to setoption except only reads the options. 00965 */ 00966 struct ast_frame *ast_channel_queryoption(struct ast_channel *channel, int option, void *data, int *datalen, int block); 00967 00968 /*! Checks for HTML support on a channel */ 00969 /*! Returns 0 if channel does not support HTML or non-zero if it does */ 00970 int ast_channel_supports_html(struct ast_channel *channel); 00971 00972 /*! Sends HTML on given channel */ 00973 /*! Send HTML or URL on link. Returns 0 on success or -1 on failure */ 00974 int ast_channel_sendhtml(struct ast_channel *channel, int subclass, const char *data, int datalen); 00975 00976 /*! Sends a URL on a given link */ 00977 /*! Send URL on link. Returns 0 on success or -1 on failure */ 00978 int ast_channel_sendurl(struct ast_channel *channel, const char *url); 00979 00980 /*! Defers DTMF */ 00981 /*! Defer DTMF so that you only read things like hangups and audio. Returns 00982 non-zero if channel was already DTMF-deferred or 0 if channel is just now 00983 being DTMF-deferred */ 00984 int ast_channel_defer_dtmf(struct ast_channel *chan); 00985 00986 /*! Undeos a defer */ 00987 /*! Undo defer. ast_read will return any dtmf characters that were queued */ 00988 void ast_channel_undefer_dtmf(struct ast_channel *chan); 00989 00990 /*! Initiate system shutdown -- prevents new channels from being allocated. 00991 If "hangup" is non-zero, all existing channels will receive soft 00992 hangups */ 00993 void ast_begin_shutdown(int hangup); 00994 00995 /*! Cancels an existing shutdown and returns to normal operation */ 00996 void ast_cancel_shutdown(void); 00997 00998 /*! Returns number of active/allocated channels */ 00999 int ast_active_channels(void); 01000 01001 /*! Returns non-zero if Asterisk is being shut down */ 01002 int ast_shutting_down(void); 01003 01004 /*! Activate a given generator */ 01005 int ast_activate_generator(struct ast_channel *chan, struct ast_generator *gen, void *params); 01006 01007 /*! Deactive an active generator */ 01008 void ast_deactivate_generator(struct ast_channel *chan); 01009 01010 void ast_set_callerid(struct ast_channel *chan, const char *cidnum, const char *cidname, const char *ani); 01011 01012 /*! Start a tone going */ 01013 int ast_tonepair_start(struct ast_channel *chan, int freq1, int freq2, int duration, int vol); 01014 /*! Stop a tone from playing */ 01015 void ast_tonepair_stop(struct ast_channel *chan); 01016 /*! Play a tone pair for a given amount of time */ 01017 int ast_tonepair(struct ast_channel *chan, int freq1, int freq2, int duration, int vol); 01018 01019 /*! Automatically service a channel for us... */ 01020 int ast_autoservice_start(struct ast_channel *chan); 01021 01022 /*! Stop servicing a channel for us... Returns -1 on error or if channel has been hungup */ 01023 int ast_autoservice_stop(struct ast_channel *chan); 01024 01025 /* If built with zaptel optimizations, force a scheduled expiration on the 01026 timer fd, at which point we call the callback function / data */ 01027 int ast_settimeout(struct ast_channel *c, int samples, int (*func)(void *data), void *data); 01028 01029 /*! \brief Transfer a channel (if supported). Returns -1 on error, 0 if not supported 01030 and 1 if supported and requested 01031 \param chan current channel 01032 \param dest destination extension for transfer 01033 */ 01034 int ast_transfer(struct ast_channel *chan, char *dest); 01035 01036 /*! \brief Start masquerading a channel 01037 XXX This is a seriously wacked out operation. We're essentially putting the guts of 01038 the clone channel into the original channel. Start by killing off the original 01039 channel's backend. I'm not sure we're going to keep this function, because 01040 while the features are nice, the cost is very high in terms of pure nastiness. XXX 01041 \param chan Channel to masquerade 01042 */ 01043 int ast_do_masquerade(struct ast_channel *chan); 01044 01045 /*! \brief Find bridged channel 01046 \param chan Current channel 01047 */ 01048 struct ast_channel *ast_bridged_channel(struct ast_channel *chan); 01049 01050 /*! 01051 \brief Inherits channel variable from parent to child channel 01052 \param parent Parent channel 01053 \param child Child channel 01054 01055 Scans all channel variables in the parent channel, looking for those 01056 that should be copied into the child channel. 01057 Variables whose names begin with a single '_' are copied into the 01058 child channel with the prefix removed. 01059 Variables whose names begin with '__' are copied into the child 01060 channel with their names unchanged. 01061 */ 01062 void ast_channel_inherit_variables(const struct ast_channel *parent, struct ast_channel *child); 01063 01064 /*! 01065 \brief adds a list of channel variables to a channel 01066 \param chan the channel 01067 \param vars a linked list of variables 01068 01069 Variable names can be for a regular channel variable or a dialplan function 01070 that has the ability to be written to. 01071 */ 01072 void ast_set_variables(struct ast_channel *chan, struct ast_variable *vars); 01073 01074 /*! 01075 \brief An opaque 'object' structure use by silence generators on channels. 01076 */ 01077 struct ast_silence_generator; 01078 01079 /*! 01080 \brief Starts a silence generator on the given channel. 01081 \param chan The channel to generate silence on 01082 \return An ast_silence_generator pointer, or NULL if an error occurs 01083 01084 This function will cause SLINEAR silence to be generated on the supplied 01085 channel until it is disabled; if the channel cannot be put into SLINEAR 01086 mode then the function will fail. 01087 01088 The pointer returned by this function must be preserved and passed to 01089 ast_channel_stop_silence_generator when you wish to stop the silence 01090 generation. 01091 */ 01092 struct ast_silence_generator *ast_channel_start_silence_generator(struct ast_channel *chan); 01093 01094 /*! 01095 \brief Stops a previously-started silence generator on the given channel. 01096 \param chan The channel to operate on 01097 \param state The ast_silence_generator pointer return by a previous call to 01098 ast_channel_start_silence_generator. 01099 \return nothing 01100 01101 This function will stop the operating silence generator and return the channel 01102 to its previous write format. 01103 */ 01104 void ast_channel_stop_silence_generator(struct ast_channel *chan, struct ast_silence_generator *state); 01105 01106 /* Misc. functions below */ 01107 01108 /* Helper function for migrating select to poll */ 01109 static inline int ast_fdisset(struct pollfd *pfds, int fd, int max, int *start) 01110 { 01111 int x; 01112 for (x=start ? *start : 0;x<max;x++) 01113 if (pfds[x].fd == fd) { 01114 if (start) { 01115 if (x==*start) 01116 (*start)++; 01117 } 01118 return pfds[x].revents; 01119 } 01120 return 0; 01121 } 01122 01123 #ifdef SOLARIS 01124 static inline void timersub(struct timeval *tvend, struct timeval *tvstart, struct timeval *tvdiff) 01125 { 01126 tvdiff->tv_sec = tvend->tv_sec - tvstart->tv_sec; 01127 tvdiff->tv_usec = tvend->tv_usec - tvstart->tv_usec; 01128 if (tvdiff->tv_usec < 0) { 01129 tvdiff->tv_sec --; 01130 tvdiff->tv_usec += 1000000; 01131 } 01132 01133 } 01134 #endif 01135 01136 /*! \brief Waits for activity on a group of channels 01137 * \param nfds the maximum number of file descriptors in the sets 01138 * \param rfds file descriptors to check for read availability 01139 * \param wfds file descriptors to check for write availability 01140 * \param efds file descriptors to check for exceptions (OOB data) 01141 * \param tvp timeout while waiting for events 01142 * This is the same as a standard select(), except it guarantees the 01143 * behaviour where the passed struct timeval is updated with how much 01144 * time was not slept while waiting for the specified events 01145 */ 01146 static inline int ast_select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *tvp) 01147 { 01148 #ifdef __linux__ 01149 return select(nfds, rfds, wfds, efds, tvp); 01150 #else 01151 if (tvp) { 01152 struct timeval tv, tvstart, tvend, tvlen; 01153 int res; 01154 01155 tv = *tvp; 01156 gettimeofday(&tvstart, NULL); 01157 res = select(nfds, rfds, wfds, efds, tvp); 01158 gettimeofday(&tvend, NULL); 01159 timersub(&tvend, &tvstart, &tvlen); 01160 timersub(&tv, &tvlen, tvp); 01161 if (tvp->tv_sec < 0 || (tvp->tv_sec == 0 && tvp->tv_usec < 0)) { 01162 tvp->tv_sec = 0; 01163 tvp->tv_usec = 0; 01164 } 01165 return res; 01166 } 01167 else 01168 return select(nfds, rfds, wfds, efds, NULL); 01169 #endif 01170 } 01171 01172 #if !defined(ast_strdupa) && defined(__GNUC__) 01173 # define ast_strdupa(s) \ 01174 (__extension__ \ 01175 ({ \ 01176 __const char *__old = (s); \ 01177 size_t __len = strlen (__old) + 1; \ 01178 char *__new = (char *) __builtin_alloca (__len); \ 01179 (char *) memcpy (__new, __old, __len); \ 01180 })) 01181 #endif 01182 01183 #ifdef DO_CRASH 01184 #define CRASH do { fprintf(stderr, "!! Forcing immediate crash a-la abort !!\n"); *((int *)0) = 0; } while(0) 01185 #else 01186 #define CRASH do { } while(0) 01187 #endif 01188 01189 #define CHECK_BLOCKING(c) { \ 01190 if (ast_test_flag(c, AST_FLAG_BLOCKING)) {\ 01191 ast_log(LOG_WARNING, "Thread %ld Blocking '%s', already blocked by thread %ld in procedure %s\n", (long) pthread_self(), (c)->name, (long) (c)->blocker, (c)->blockproc); \ 01192 CRASH; \ 01193 } else { \ 01194 (c)->blocker = pthread_self(); \ 01195 (c)->blockproc = __PRETTY_FUNCTION__; \ 01196 ast_set_flag(c, AST_FLAG_BLOCKING); \ 01197 } } 01198 01199 extern ast_group_t ast_get_group(char *s); 01200 /* print call- and pickup groups into buffer */ 01201 extern char *ast_print_group(char *buf, int buflen, ast_group_t group); 01202 01203 01204 #if defined(__cplusplus) || defined(c_plusplus) 01205 } 01206 #endif 01207 01208 #endif /* _ASTERISK_CHANNEL_H */