Always treat arguments to get_by_name_cb as strings
[asterisk/asterisk.git] / main / channel.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 1999 - 2006, Digium, Inc.
5  *
6  * Mark Spencer <markster@digium.com>
7  *
8  * See http://www.asterisk.org for more information about
9  * the Asterisk project. Please do not directly contact
10  * any of the maintainers of this project for assistance;
11  * the project provides a web site, mailing lists and IRC
12  * channels for your use.
13  *
14  * This program is free software, distributed under the terms of
15  * the GNU General Public License Version 2. See the LICENSE file
16  * at the top of the source tree.
17  */
18
19 /*! \file
20  *
21  * \brief Channel Management
22  *
23  * \author Mark Spencer <markster@digium.com>
24  */
25
26 #include "asterisk.h"
27
28 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
29
30 #include "asterisk/_private.h"
31
32 #include <sys/time.h>
33 #include <signal.h>
34 #include <math.h>
35
36 #include "asterisk/paths.h"     /* use ast_config_AST_SYSTEM_NAME */
37
38 #include "asterisk/pbx.h"
39 #include "asterisk/frame.h"
40 #include "asterisk/mod_format.h"
41 #include "asterisk/sched.h"
42 #include "asterisk/channel.h"
43 #include "asterisk/musiconhold.h"
44 #include "asterisk/say.h"
45 #include "asterisk/file.h"
46 #include "asterisk/cli.h"
47 #include "asterisk/translate.h"
48 #include "asterisk/manager.h"
49 #include "asterisk/cel.h"
50 #include "asterisk/chanvars.h"
51 #include "asterisk/linkedlists.h"
52 #include "asterisk/indications.h"
53 #include "asterisk/monitor.h"
54 #include "asterisk/causes.h"
55 #include "asterisk/callerid.h"
56 #include "asterisk/utils.h"
57 #include "asterisk/lock.h"
58 #include "asterisk/app.h"
59 #include "asterisk/transcap.h"
60 #include "asterisk/devicestate.h"
61 #include "asterisk/threadstorage.h"
62 #include "asterisk/slinfactory.h"
63 #include "asterisk/audiohook.h"
64 #include "asterisk/framehook.h"
65 #include "asterisk/timing.h"
66 #include "asterisk/autochan.h"
67 #include "asterisk/stringfields.h"
68 #include "asterisk/global_datastores.h"
69 #include "asterisk/data.h"
70
71 #ifdef HAVE_EPOLL
72 #include <sys/epoll.h>
73 #endif
74
75 #if defined(KEEP_TILL_CHANNEL_PARTY_NUMBER_INFO_NEEDED)
76 #if defined(HAVE_PRI)
77 #include "libpri.h"
78 #endif  /* defined(HAVE_PRI) */
79 #endif  /* defined(KEEP_TILL_CHANNEL_PARTY_NUMBER_INFO_NEEDED) */
80
81 struct ast_epoll_data {
82         struct ast_channel *chan;
83         int which;
84 };
85
86 /* uncomment if you have problems with 'monitoring' synchronized files */
87 #if 0
88 #define MONITOR_CONSTANT_DELAY
89 #define MONITOR_DELAY   150 * 8         /*!< 150 ms of MONITORING DELAY */
90 #endif
91
92 /*! \brief Prevent new channel allocation if shutting down. */
93 static int shutting_down;
94
95 static int uniqueint;
96
97 unsigned long global_fin, global_fout;
98
99 AST_THREADSTORAGE(state2str_threadbuf);
100 #define STATE2STR_BUFSIZE   32
101
102 /*! Default amount of time to use when emulating a digit as a begin and end 
103  *  100ms */
104 #define AST_DEFAULT_EMULATE_DTMF_DURATION 100
105
106 /*! Minimum allowed digit length - 80ms */
107 #define AST_MIN_DTMF_DURATION 80
108
109 /*! Minimum amount of time between the end of the last digit and the beginning 
110  *  of a new one - 45ms */
111 #define AST_MIN_DTMF_GAP 45
112
113 /*! \brief List of channel drivers */
114 struct chanlist {
115         const struct ast_channel_tech *tech;
116         AST_LIST_ENTRY(chanlist) list;
117 };
118
119 #ifdef CHANNEL_TRACE
120 /*! \brief Structure to hold channel context backtrace data */
121 struct ast_chan_trace_data {
122         int enabled;
123         AST_LIST_HEAD_NOLOCK(, ast_chan_trace) trace;
124 };
125
126 /*! \brief Structure to save contexts where an ast_chan has been into */
127 struct ast_chan_trace {
128         char context[AST_MAX_CONTEXT];
129         char exten[AST_MAX_EXTENSION];
130         int priority;
131         AST_LIST_ENTRY(ast_chan_trace) entry;
132 };
133 #endif
134
135 /*! \brief the list of registered channel types */
136 static AST_RWLIST_HEAD_STATIC(backends, chanlist);
137
138 #ifdef LOW_MEMORY
139 #define NUM_CHANNEL_BUCKETS 61
140 #else
141 #define NUM_CHANNEL_BUCKETS 1567
142 #endif
143
144 /*! \brief All active channels on the system */
145 static struct ao2_container *channels;
146
147 /*! \brief map AST_CAUSE's to readable string representations 
148  *
149  * \ref causes.h
150 */
151 static const struct {
152         int cause;
153         const char *name;
154         const char *desc;
155 } causes[] = {
156         { AST_CAUSE_UNALLOCATED, "UNALLOCATED", "Unallocated (unassigned) number" },
157         { AST_CAUSE_NO_ROUTE_TRANSIT_NET, "NO_ROUTE_TRANSIT_NET", "No route to specified transmit network" },
158         { AST_CAUSE_NO_ROUTE_DESTINATION, "NO_ROUTE_DESTINATION", "No route to destination" },
159         { AST_CAUSE_CHANNEL_UNACCEPTABLE, "CHANNEL_UNACCEPTABLE", "Channel unacceptable" },
160         { AST_CAUSE_CALL_AWARDED_DELIVERED, "CALL_AWARDED_DELIVERED", "Call awarded and being delivered in an established channel" },
161         { AST_CAUSE_NORMAL_CLEARING, "NORMAL_CLEARING", "Normal Clearing" },
162         { AST_CAUSE_USER_BUSY, "USER_BUSY", "User busy" },
163         { AST_CAUSE_NO_USER_RESPONSE, "NO_USER_RESPONSE", "No user responding" },
164         { AST_CAUSE_NO_ANSWER, "NO_ANSWER", "User alerting, no answer" },
165         { AST_CAUSE_CALL_REJECTED, "CALL_REJECTED", "Call Rejected" },
166         { AST_CAUSE_NUMBER_CHANGED, "NUMBER_CHANGED", "Number changed" },
167         { AST_CAUSE_DESTINATION_OUT_OF_ORDER, "DESTINATION_OUT_OF_ORDER", "Destination out of order" },
168         { AST_CAUSE_INVALID_NUMBER_FORMAT, "INVALID_NUMBER_FORMAT", "Invalid number format" },
169         { AST_CAUSE_FACILITY_REJECTED, "FACILITY_REJECTED", "Facility rejected" },
170         { AST_CAUSE_RESPONSE_TO_STATUS_ENQUIRY, "RESPONSE_TO_STATUS_ENQUIRY", "Response to STATus ENQuiry" },
171         { AST_CAUSE_NORMAL_UNSPECIFIED, "NORMAL_UNSPECIFIED", "Normal, unspecified" },
172         { AST_CAUSE_NORMAL_CIRCUIT_CONGESTION, "NORMAL_CIRCUIT_CONGESTION", "Circuit/channel congestion" },
173         { AST_CAUSE_NETWORK_OUT_OF_ORDER, "NETWORK_OUT_OF_ORDER", "Network out of order" },
174         { AST_CAUSE_NORMAL_TEMPORARY_FAILURE, "NORMAL_TEMPORARY_FAILURE", "Temporary failure" },
175         { AST_CAUSE_SWITCH_CONGESTION, "SWITCH_CONGESTION", "Switching equipment congestion" },
176         { AST_CAUSE_ACCESS_INFO_DISCARDED, "ACCESS_INFO_DISCARDED", "Access information discarded" },
177         { AST_CAUSE_REQUESTED_CHAN_UNAVAIL, "REQUESTED_CHAN_UNAVAIL", "Requested channel not available" },
178         { AST_CAUSE_PRE_EMPTED, "PRE_EMPTED", "Pre-empted" },
179         { AST_CAUSE_FACILITY_NOT_SUBSCRIBED, "FACILITY_NOT_SUBSCRIBED", "Facility not subscribed" },
180         { AST_CAUSE_OUTGOING_CALL_BARRED, "OUTGOING_CALL_BARRED", "Outgoing call barred" },
181         { AST_CAUSE_INCOMING_CALL_BARRED, "INCOMING_CALL_BARRED", "Incoming call barred" },
182         { AST_CAUSE_BEARERCAPABILITY_NOTAUTH, "BEARERCAPABILITY_NOTAUTH", "Bearer capability not authorized" },
183         { AST_CAUSE_BEARERCAPABILITY_NOTAVAIL, "BEARERCAPABILITY_NOTAVAIL", "Bearer capability not available" },
184         { AST_CAUSE_BEARERCAPABILITY_NOTIMPL, "BEARERCAPABILITY_NOTIMPL", "Bearer capability not implemented" },
185         { AST_CAUSE_CHAN_NOT_IMPLEMENTED, "CHAN_NOT_IMPLEMENTED", "Channel not implemented" },
186         { AST_CAUSE_FACILITY_NOT_IMPLEMENTED, "FACILITY_NOT_IMPLEMENTED", "Facility not implemented" },
187         { AST_CAUSE_INVALID_CALL_REFERENCE, "INVALID_CALL_REFERENCE", "Invalid call reference value" },
188         { AST_CAUSE_INCOMPATIBLE_DESTINATION, "INCOMPATIBLE_DESTINATION", "Incompatible destination" },
189         { AST_CAUSE_INVALID_MSG_UNSPECIFIED, "INVALID_MSG_UNSPECIFIED", "Invalid message unspecified" },
190         { AST_CAUSE_MANDATORY_IE_MISSING, "MANDATORY_IE_MISSING", "Mandatory information element is missing" },
191         { AST_CAUSE_MESSAGE_TYPE_NONEXIST, "MESSAGE_TYPE_NONEXIST", "Message type nonexist." },
192         { AST_CAUSE_WRONG_MESSAGE, "WRONG_MESSAGE", "Wrong message" },
193         { AST_CAUSE_IE_NONEXIST, "IE_NONEXIST", "Info. element nonexist or not implemented" },
194         { AST_CAUSE_INVALID_IE_CONTENTS, "INVALID_IE_CONTENTS", "Invalid information element contents" },
195         { AST_CAUSE_WRONG_CALL_STATE, "WRONG_CALL_STATE", "Message not compatible with call state" },
196         { AST_CAUSE_RECOVERY_ON_TIMER_EXPIRE, "RECOVERY_ON_TIMER_EXPIRE", "Recover on timer expiry" },
197         { AST_CAUSE_MANDATORY_IE_LENGTH_ERROR, "MANDATORY_IE_LENGTH_ERROR", "Mandatory IE length error" },
198         { AST_CAUSE_PROTOCOL_ERROR, "PROTOCOL_ERROR", "Protocol error, unspecified" },
199         { AST_CAUSE_INTERWORKING, "INTERWORKING", "Interworking, unspecified" },
200 };
201
202 struct ast_variable *ast_channeltype_list(void)
203 {
204         struct chanlist *cl;
205         struct ast_variable *var = NULL, *prev = NULL;
206
207         AST_RWLIST_RDLOCK(&backends);
208         AST_RWLIST_TRAVERSE(&backends, cl, list) {
209                 if (prev)  {
210                         if ((prev->next = ast_variable_new(cl->tech->type, cl->tech->description, "")))
211                                 prev = prev->next;
212                 } else {
213                         var = ast_variable_new(cl->tech->type, cl->tech->description, "");
214                         prev = var;
215                 }
216         }
217         AST_RWLIST_UNLOCK(&backends);
218
219         return var;
220 }
221
222 #if defined(KEEP_TILL_CHANNEL_PARTY_NUMBER_INFO_NEEDED)
223 static const char *party_number_ton2str(int ton)
224 {
225 #if defined(HAVE_PRI)
226         switch ((ton >> 4) & 0x07) {
227         case PRI_TON_INTERNATIONAL:
228                 return "International";
229         case PRI_TON_NATIONAL:
230                 return "National";
231         case PRI_TON_NET_SPECIFIC:
232                 return "Network Specific";
233         case PRI_TON_SUBSCRIBER:
234                 return "Subscriber";
235         case PRI_TON_ABBREVIATED:
236                 return "Abbreviated";
237         case PRI_TON_RESERVED:
238                 return "Reserved";
239         case PRI_TON_UNKNOWN:
240         default:
241                 break;
242         }
243 #endif  /* defined(HAVE_PRI) */
244         return "Unknown";
245 }
246 #endif  /* defined(KEEP_TILL_CHANNEL_PARTY_NUMBER_INFO_NEEDED) */
247
248 #if defined(KEEP_TILL_CHANNEL_PARTY_NUMBER_INFO_NEEDED)
249 static const char *party_number_plan2str(int plan)
250 {
251 #if defined(HAVE_PRI)
252         switch (plan & 0x0F) {
253         default:
254         case PRI_NPI_UNKNOWN:
255                 break;
256         case PRI_NPI_E163_E164:
257                 return "Public (E.163/E.164)";
258         case PRI_NPI_X121:
259                 return "Data (X.121)";
260         case PRI_NPI_F69:
261                 return "Telex (F.69)";
262         case PRI_NPI_NATIONAL:
263                 return "National Standard";
264         case PRI_NPI_PRIVATE:
265                 return "Private";
266         case PRI_NPI_RESERVED:
267                 return "Reserved";
268         }
269 #endif  /* defined(HAVE_PRI) */
270         return "Unknown";
271 }
272 #endif  /* defined(KEEP_TILL_CHANNEL_PARTY_NUMBER_INFO_NEEDED) */
273
274 /*! \brief Show channel types - CLI command */
275 static char *handle_cli_core_show_channeltypes(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
276 {
277 #define FORMAT  "%-10.10s  %-40.40s %-12.12s %-12.12s %-12.12s\n"
278         struct chanlist *cl;
279         int count_chan = 0;
280
281         switch (cmd) {
282         case CLI_INIT:
283                 e->command = "core show channeltypes";
284                 e->usage =
285                         "Usage: core show channeltypes\n"
286                         "       Lists available channel types registered in your\n"
287                         "       Asterisk server.\n";
288                 return NULL;
289         case CLI_GENERATE:
290                 return NULL;
291         }
292
293         if (a->argc != 3)
294                 return CLI_SHOWUSAGE;
295
296         ast_cli(a->fd, FORMAT, "Type", "Description",       "Devicestate", "Indications", "Transfer");
297         ast_cli(a->fd, FORMAT, "----------", "-----------", "-----------", "-----------", "--------");
298
299         AST_RWLIST_RDLOCK(&backends);
300         AST_RWLIST_TRAVERSE(&backends, cl, list) {
301                 ast_cli(a->fd, FORMAT, cl->tech->type, cl->tech->description,
302                         (cl->tech->devicestate) ? "yes" : "no",
303                         (cl->tech->indicate) ? "yes" : "no",
304                         (cl->tech->transfer) ? "yes" : "no");
305                 count_chan++;
306         }
307         AST_RWLIST_UNLOCK(&backends);
308
309         ast_cli(a->fd, "----------\n%d channel drivers registered.\n", count_chan);
310
311         return CLI_SUCCESS;
312
313 #undef FORMAT
314 }
315
316 static char *complete_channeltypes(struct ast_cli_args *a)
317 {
318         struct chanlist *cl;
319         int which = 0;
320         int wordlen;
321         char *ret = NULL;
322
323         if (a->pos != 3)
324                 return NULL;
325
326         wordlen = strlen(a->word);
327
328         AST_RWLIST_RDLOCK(&backends);
329         AST_RWLIST_TRAVERSE(&backends, cl, list) {
330                 if (!strncasecmp(a->word, cl->tech->type, wordlen) && ++which > a->n) {
331                         ret = ast_strdup(cl->tech->type);
332                         break;
333                 }
334         }
335         AST_RWLIST_UNLOCK(&backends);
336         
337         return ret;
338 }
339
340 /*! \brief Show details about a channel driver - CLI command */
341 static char *handle_cli_core_show_channeltype(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
342 {
343         struct chanlist *cl = NULL;
344         char buf[512];
345
346         switch (cmd) {
347         case CLI_INIT:
348                 e->command = "core show channeltype";
349                 e->usage =
350                         "Usage: core show channeltype <name>\n"
351                         "       Show details about the specified channel type, <name>.\n";
352                 return NULL;
353         case CLI_GENERATE:
354                 return complete_channeltypes(a);
355         }
356
357         if (a->argc != 4)
358                 return CLI_SHOWUSAGE;
359         
360         AST_RWLIST_RDLOCK(&backends);
361
362         AST_RWLIST_TRAVERSE(&backends, cl, list) {
363                 if (!strncasecmp(cl->tech->type, a->argv[3], strlen(cl->tech->type)))
364                         break;
365         }
366
367
368         if (!cl) {
369                 ast_cli(a->fd, "\n%s is not a registered channel driver.\n", a->argv[3]);
370                 AST_RWLIST_UNLOCK(&backends);
371                 return CLI_FAILURE;
372         }
373
374         ast_cli(a->fd,
375                 "-- Info about channel driver: %s --\n"
376                 "  Device State: %s\n"
377                 "    Indication: %s\n"
378                 "     Transfer : %s\n"
379                 "  Capabilities: %s\n"
380                 "   Digit Begin: %s\n"
381                 "     Digit End: %s\n"
382                 "    Send HTML : %s\n"
383                 " Image Support: %s\n"
384                 "  Text Support: %s\n",
385                 cl->tech->type,
386                 (cl->tech->devicestate) ? "yes" : "no",
387                 (cl->tech->indicate) ? "yes" : "no",
388                 (cl->tech->transfer) ? "yes" : "no",
389                 ast_getformatname_multiple(buf, sizeof(buf), cl->tech->capabilities),
390                 (cl->tech->send_digit_begin) ? "yes" : "no",
391                 (cl->tech->send_digit_end) ? "yes" : "no",
392                 (cl->tech->send_html) ? "yes" : "no",
393                 (cl->tech->send_image) ? "yes" : "no",
394                 (cl->tech->send_text) ? "yes" : "no"
395                 
396         );
397
398         AST_RWLIST_UNLOCK(&backends);
399
400         return CLI_SUCCESS;
401 }
402
403 static struct ast_cli_entry cli_channel[] = {
404         AST_CLI_DEFINE(handle_cli_core_show_channeltypes, "List available channel types"),
405         AST_CLI_DEFINE(handle_cli_core_show_channeltype,  "Give more details on that channel type")
406 };
407
408 static struct ast_frame *kill_read(struct ast_channel *chan)
409 {
410         /* Hangup channel. */
411         return NULL;
412 }
413
414 static struct ast_frame *kill_exception(struct ast_channel *chan)
415 {
416         /* Hangup channel. */
417         return NULL;
418 }
419
420 static int kill_write(struct ast_channel *chan, struct ast_frame *frame)
421 {
422         /* Hangup channel. */
423         return -1;
424 }
425
426 static int kill_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
427 {
428         /* No problem fixing up the channel. */
429         return 0;
430 }
431
432 static int kill_hangup(struct ast_channel *chan)
433 {
434         chan->tech_pvt = NULL;
435         return 0;
436 }
437
438 /*!
439  * \brief Kill the channel channel driver technology descriptor.
440  *
441  * \details
442  * The purpose of this channel technology is to encourage the
443  * channel to hangup as quickly as possible.
444  *
445  * \note Used by DTMF atxfer and zombie channels.
446  */
447 const struct ast_channel_tech ast_kill_tech = {
448         .type = "Kill",
449         .description = "Kill channel (should not see this)",
450         .read = kill_read,
451         .exception = kill_exception,
452         .write = kill_write,
453         .fixup = kill_fixup,
454         .hangup = kill_hangup,
455 };
456
457 #ifdef CHANNEL_TRACE
458 /*! \brief Destructor for the channel trace datastore */
459 static void ast_chan_trace_destroy_cb(void *data)
460 {
461         struct ast_chan_trace *trace;
462         struct ast_chan_trace_data *traced = data;
463         while ((trace = AST_LIST_REMOVE_HEAD(&traced->trace, entry))) {
464                 ast_free(trace);
465         }
466         ast_free(traced);
467 }
468
469 /*! \brief Datastore to put the linked list of ast_chan_trace and trace status */
470 static const struct ast_datastore_info ast_chan_trace_datastore_info = {
471         .type = "ChanTrace",
472         .destroy = ast_chan_trace_destroy_cb
473 };
474
475 /*! \brief Put the channel backtrace in a string */
476 int ast_channel_trace_serialize(struct ast_channel *chan, struct ast_str **buf)
477 {
478         int total = 0;
479         struct ast_chan_trace *trace;
480         struct ast_chan_trace_data *traced;
481         struct ast_datastore *store;
482
483         ast_channel_lock(chan);
484         store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL);
485         if (!store) {
486                 ast_channel_unlock(chan);
487                 return total;
488         }
489         traced = store->data;
490         ast_str_reset(*buf);
491         AST_LIST_TRAVERSE(&traced->trace, trace, entry) {
492                 if (ast_str_append(buf, 0, "[%d] => %s, %s, %d\n", total, trace->context, trace->exten, trace->priority) < 0) {
493                         ast_log(LOG_ERROR, "Data Buffer Size Exceeded!\n");
494                         total = -1;
495                         break;
496                 }
497                 total++;
498         }
499         ast_channel_unlock(chan);
500         return total;
501 }
502
503 /* !\brief Whether or not context tracing is enabled */
504 int ast_channel_trace_is_enabled(struct ast_channel *chan)
505 {
506         struct ast_datastore *store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL);
507         if (!store)
508                 return 0;
509         return ((struct ast_chan_trace_data *)store->data)->enabled;
510 }
511
512 /*! \brief Update the context backtrace data if tracing is enabled */
513 static int ast_channel_trace_data_update(struct ast_channel *chan, struct ast_chan_trace_data *traced)
514 {
515         struct ast_chan_trace *trace;
516         if (!traced->enabled)
517                 return 0;
518         /* If the last saved context does not match the current one
519            OR we have not saved any context so far, then save the current context */
520         if ((!AST_LIST_EMPTY(&traced->trace) && strcasecmp(AST_LIST_FIRST(&traced->trace)->context, chan->context)) ||
521             (AST_LIST_EMPTY(&traced->trace))) {
522                 /* Just do some debug logging */
523                 if (AST_LIST_EMPTY(&traced->trace))
524                         ast_debug(1, "Setting initial trace context to %s\n", chan->context);
525                 else
526                         ast_debug(1, "Changing trace context from %s to %s\n", AST_LIST_FIRST(&traced->trace)->context, chan->context);
527                 /* alloc or bail out */
528                 trace = ast_malloc(sizeof(*trace));
529                 if (!trace)
530                         return -1;
531                 /* save the current location and store it in the trace list */
532                 ast_copy_string(trace->context, chan->context, sizeof(trace->context));
533                 ast_copy_string(trace->exten, chan->exten, sizeof(trace->exten));
534                 trace->priority = chan->priority;
535                 AST_LIST_INSERT_HEAD(&traced->trace, trace, entry);
536         }
537         return 0;
538 }
539
540 /*! \brief Update the context backtrace if tracing is enabled */
541 int ast_channel_trace_update(struct ast_channel *chan)
542 {
543         struct ast_datastore *store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL);
544         if (!store)
545                 return 0;
546         return ast_channel_trace_data_update(chan, store->data);
547 }
548
549 /*! \brief Enable context tracing in the channel */
550 int ast_channel_trace_enable(struct ast_channel *chan)
551 {
552         struct ast_datastore *store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL);
553         struct ast_chan_trace_data *traced;
554         if (!store) {
555                 store = ast_datastore_alloc(&ast_chan_trace_datastore_info, "ChanTrace");
556                 if (!store) 
557                         return -1;
558                 traced = ast_calloc(1, sizeof(*traced));
559                 if (!traced) {
560                         ast_datastore_free(store);
561                         return -1;
562                 }       
563                 store->data = traced;
564                 AST_LIST_HEAD_INIT_NOLOCK(&traced->trace);
565                 ast_channel_datastore_add(chan, store);
566         }       
567         ((struct ast_chan_trace_data *)store->data)->enabled = 1;
568         ast_channel_trace_data_update(chan, store->data);
569         return 0;
570 }
571
572 /*! \brief Disable context tracing in the channel */
573 int ast_channel_trace_disable(struct ast_channel *chan)
574 {
575         struct ast_datastore *store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL);
576         if (!store)
577                 return 0;
578         ((struct ast_chan_trace_data *)store->data)->enabled = 0;
579         return 0;
580 }
581 #endif /* CHANNEL_TRACE */
582
583 /*! \brief Checks to see if a channel is needing hang up */
584 int ast_check_hangup(struct ast_channel *chan)
585 {
586         if (chan->_softhangup)          /* yes if soft hangup flag set */
587                 return 1;
588         if (ast_tvzero(chan->whentohangup))     /* no if no hangup scheduled */
589                 return 0;
590         if (ast_tvdiff_ms(chan->whentohangup, ast_tvnow()) > 0)         /* no if hangup time has not come yet. */
591                 return 0;
592         ast_debug(4, "Hangup time has come: %" PRIi64 "\n", ast_tvdiff_ms(chan->whentohangup, ast_tvnow()));
593         chan->_softhangup |= AST_SOFTHANGUP_TIMEOUT;    /* record event */
594         return 1;
595 }
596
597 int ast_check_hangup_locked(struct ast_channel *chan)
598 {
599         int res;
600         ast_channel_lock(chan);
601         res = ast_check_hangup(chan);
602         ast_channel_unlock(chan);
603         return res;
604 }
605
606 static int ast_channel_softhangup_cb(void *obj, void *arg, int flags)
607 {
608         struct ast_channel *chan = obj;
609
610         ast_softhangup(chan, AST_SOFTHANGUP_SHUTDOWN);
611
612         return 0;
613 }
614
615 void ast_begin_shutdown(int hangup)
616 {
617         shutting_down = 1;
618
619         if (hangup) {
620                 ao2_callback(channels, OBJ_NODATA | OBJ_MULTIPLE, ast_channel_softhangup_cb, NULL);
621         }
622 }
623
624 /*! \brief returns number of active/allocated channels */
625 int ast_active_channels(void)
626 {
627         return channels ? ao2_container_count(channels) : 0;
628 }
629
630 /*! \brief Cancel a shutdown in progress */
631 void ast_cancel_shutdown(void)
632 {
633         shutting_down = 0;
634 }
635
636 /*! \brief Returns non-zero if Asterisk is being shut down */
637 int ast_shutting_down(void)
638 {
639         return shutting_down;
640 }
641
642 /*! \brief Set when to hangup channel */
643 void ast_channel_setwhentohangup_tv(struct ast_channel *chan, struct timeval offset)
644 {
645         chan->whentohangup = ast_tvzero(offset) ? offset : ast_tvadd(offset, ast_tvnow());
646         ast_queue_frame(chan, &ast_null_frame);
647         return;
648 }
649
650 void ast_channel_setwhentohangup(struct ast_channel *chan, time_t offset)
651 {
652         struct timeval when = { offset, };
653         ast_channel_setwhentohangup_tv(chan, when);
654 }
655
656 /*! \brief Compare a offset with when to hangup channel */
657 int ast_channel_cmpwhentohangup_tv(struct ast_channel *chan, struct timeval offset)
658 {
659         struct timeval whentohangup;
660
661         if (ast_tvzero(chan->whentohangup))
662                 return ast_tvzero(offset) ? 0 : -1;
663
664         if (ast_tvzero(offset))
665                 return 1;
666
667         whentohangup = ast_tvadd(offset, ast_tvnow());
668
669         return ast_tvdiff_ms(whentohangup, chan->whentohangup);
670 }
671
672 int ast_channel_cmpwhentohangup(struct ast_channel *chan, time_t offset)
673 {
674         struct timeval when = { offset, };
675         return ast_channel_cmpwhentohangup_tv(chan, when);
676 }
677
678 /*! \brief Register a new telephony channel in Asterisk */
679 int ast_channel_register(const struct ast_channel_tech *tech)
680 {
681         struct chanlist *chan;
682
683         AST_RWLIST_WRLOCK(&backends);
684
685         AST_RWLIST_TRAVERSE(&backends, chan, list) {
686                 if (!strcasecmp(tech->type, chan->tech->type)) {
687                         ast_log(LOG_WARNING, "Already have a handler for type '%s'\n", tech->type);
688                         AST_RWLIST_UNLOCK(&backends);
689                         return -1;
690                 }
691         }
692
693         if (!(chan = ast_calloc(1, sizeof(*chan)))) {
694                 AST_RWLIST_UNLOCK(&backends);
695                 return -1;
696         }
697         chan->tech = tech;
698         AST_RWLIST_INSERT_HEAD(&backends, chan, list);
699
700         ast_debug(1, "Registered handler for '%s' (%s)\n", chan->tech->type, chan->tech->description);
701
702         ast_verb(2, "Registered channel type '%s' (%s)\n", chan->tech->type, chan->tech->description);
703
704         AST_RWLIST_UNLOCK(&backends);
705
706         return 0;
707 }
708
709 /*! \brief Unregister channel driver */
710 void ast_channel_unregister(const struct ast_channel_tech *tech)
711 {
712         struct chanlist *chan;
713
714         ast_debug(1, "Unregistering channel type '%s'\n", tech->type);
715
716         AST_RWLIST_WRLOCK(&backends);
717
718         AST_RWLIST_TRAVERSE_SAFE_BEGIN(&backends, chan, list) {
719                 if (chan->tech == tech) {
720                         AST_LIST_REMOVE_CURRENT(list);
721                         ast_free(chan);
722                         ast_verb(2, "Unregistered channel type '%s'\n", tech->type);
723                         break;  
724                 }
725         }
726         AST_LIST_TRAVERSE_SAFE_END;
727
728         AST_RWLIST_UNLOCK(&backends);
729 }
730
731 /*! \brief Get handle to channel driver based on name */
732 const struct ast_channel_tech *ast_get_channel_tech(const char *name)
733 {
734         struct chanlist *chanls;
735         const struct ast_channel_tech *ret = NULL;
736
737         AST_RWLIST_RDLOCK(&backends);
738
739         AST_RWLIST_TRAVERSE(&backends, chanls, list) {
740                 if (!strcasecmp(name, chanls->tech->type)) {
741                         ret = chanls->tech;
742                         break;
743                 }
744         }
745
746         AST_RWLIST_UNLOCK(&backends);
747         
748         return ret;
749 }
750
751 /*! \brief Gives the string form of a given hangup cause */
752 const char *ast_cause2str(int cause)
753 {
754         int x;
755
756         for (x = 0; x < ARRAY_LEN(causes); x++) {
757                 if (causes[x].cause == cause)
758                         return causes[x].desc;
759         }
760
761         return "Unknown";
762 }
763
764 /*! \brief Convert a symbolic hangup cause to number */
765 int ast_str2cause(const char *name)
766 {
767         int x;
768
769         for (x = 0; x < ARRAY_LEN(causes); x++)
770                 if (!strncasecmp(causes[x].name, name, strlen(causes[x].name)))
771                         return causes[x].cause;
772
773         return -1;
774 }
775
776 /*! \brief Gives the string form of a given channel state.
777         \note This function is not reentrant.
778  */
779 const char *ast_state2str(enum ast_channel_state state)
780 {
781         char *buf;
782
783         switch (state) {
784         case AST_STATE_DOWN:
785                 return "Down";
786         case AST_STATE_RESERVED:
787                 return "Rsrvd";
788         case AST_STATE_OFFHOOK:
789                 return "OffHook";
790         case AST_STATE_DIALING:
791                 return "Dialing";
792         case AST_STATE_RING:
793                 return "Ring";
794         case AST_STATE_RINGING:
795                 return "Ringing";
796         case AST_STATE_UP:
797                 return "Up";
798         case AST_STATE_BUSY:
799                 return "Busy";
800         case AST_STATE_DIALING_OFFHOOK:
801                 return "Dialing Offhook";
802         case AST_STATE_PRERING:
803                 return "Pre-ring";
804         default:
805                 if (!(buf = ast_threadstorage_get(&state2str_threadbuf, STATE2STR_BUFSIZE)))
806                         return "Unknown";
807                 snprintf(buf, STATE2STR_BUFSIZE, "Unknown (%d)", state);
808                 return buf;
809         }
810 }
811
812 /*! \brief Gives the string form of a given transfer capability */
813 char *ast_transfercapability2str(int transfercapability)
814 {
815         switch (transfercapability) {
816         case AST_TRANS_CAP_SPEECH:
817                 return "SPEECH";
818         case AST_TRANS_CAP_DIGITAL:
819                 return "DIGITAL";
820         case AST_TRANS_CAP_RESTRICTED_DIGITAL:
821                 return "RESTRICTED_DIGITAL";
822         case AST_TRANS_CAP_3_1K_AUDIO:
823                 return "3K1AUDIO";
824         case AST_TRANS_CAP_DIGITAL_W_TONES:
825                 return "DIGITAL_W_TONES";
826         case AST_TRANS_CAP_VIDEO:
827                 return "VIDEO";
828         default:
829                 return "UNKNOWN";
830         }
831 }
832
833 /*! \brief Pick the best audio codec */
834 struct ast_format *ast_best_codec(struct ast_format_cap *cap, struct ast_format *result)
835 {
836         /* This just our opinion, expressed in code.  We are asked to choose
837            the best codec to use, given no information */
838         static const enum ast_format_id prefs[] =
839         {
840                 /*! Okay, ulaw is used by all telephony equipment, so start with it */
841                 AST_FORMAT_ULAW,
842                 /*! Unless of course, you're a silly European, so then prefer ALAW */
843                 AST_FORMAT_ALAW,
844                 AST_FORMAT_G719,
845                 AST_FORMAT_SIREN14,
846                 AST_FORMAT_SIREN7,
847                 AST_FORMAT_TESTLAW,
848                 /*! G.722 is better then all below, but not as common as the above... so give ulaw and alaw priority */
849                 AST_FORMAT_G722,
850                 /*! Okay, well, signed linear is easy to translate into other stuff */
851                 AST_FORMAT_SLINEAR192,
852                 AST_FORMAT_SLINEAR96,
853                 AST_FORMAT_SLINEAR48,
854                 AST_FORMAT_SLINEAR44,
855                 AST_FORMAT_SLINEAR32,
856                 AST_FORMAT_SLINEAR24,
857                 AST_FORMAT_SLINEAR16,
858                 AST_FORMAT_SLINEAR12,
859                 AST_FORMAT_SLINEAR,
860                 /*! G.726 is standard ADPCM, in RFC3551 packing order */
861                 AST_FORMAT_G726,
862                 /*! G.726 is standard ADPCM, in AAL2 packing order */
863                 AST_FORMAT_G726_AAL2,
864                 /*! ADPCM has great sound quality and is still pretty easy to translate */
865                 AST_FORMAT_ADPCM,
866                 /*! Okay, we're down to vocoders now, so pick GSM because it's small and easier to
867                     translate and sounds pretty good */
868                 AST_FORMAT_GSM,
869                 /*! iLBC is not too bad */
870                 AST_FORMAT_ILBC,
871                 /*! Speex is free, but computationally more expensive than GSM */
872                 AST_FORMAT_SPEEX32,
873                 AST_FORMAT_SPEEX16,
874                 AST_FORMAT_SPEEX,
875                 /*! SILK is pretty awesome. */
876                 AST_FORMAT_SILK,
877                 /*! CELT supports crazy high sample rates */
878                 AST_FORMAT_CELT,
879                 /*! Ick, LPC10 sounds terrible, but at least we have code for it, if you're tacky enough
880                     to use it */
881                 AST_FORMAT_LPC10,
882                 /*! G.729a is faster than 723 and slightly less expensive */
883                 AST_FORMAT_G729A,
884                 /*! Down to G.723.1 which is proprietary but at least designed for voice */
885                 AST_FORMAT_G723_1,
886         };
887         char buf[512];
888         int x;
889
890         /* Find the first preferred codec in the format given */
891         for (x = 0; x < ARRAY_LEN(prefs); x++) {
892                 if (ast_format_cap_best_byid(cap, prefs[x], result)) {
893                         return result;
894                 }
895         }
896
897         ast_format_clear(result);
898         ast_log(LOG_WARNING, "Don't know any of %s formats\n", ast_getformatname_multiple(buf, sizeof(buf), cap));
899
900         return NULL;
901 }
902
903 static const struct ast_channel_tech null_tech = {
904         .type = "NULL",
905         .description = "Null channel (should not see this)",
906 };
907
908 static void ast_channel_destructor(void *obj);
909 static void ast_dummy_channel_destructor(void *obj);
910
911 /*! \brief Create a new channel structure */
912 static struct ast_channel * attribute_malloc __attribute__((format(printf, 13, 0)))
913 __ast_channel_alloc_ap(int needqueue, int state, const char *cid_num, const char *cid_name,
914                        const char *acctcode, const char *exten, const char *context,
915                        const char *linkedid, const int amaflag, const char *file, int line,
916                        const char *function, const char *name_fmt, va_list ap)
917 {
918         struct ast_channel *tmp;
919         int x;
920         int flags;
921         struct varshead *headp;
922         char *tech = "", *tech2 = NULL;
923
924         /* If shutting down, don't allocate any new channels */
925         if (shutting_down) {
926                 ast_log(LOG_WARNING, "Channel allocation failed: Refusing due to active shutdown\n");
927                 return NULL;
928         }
929
930 #if defined(REF_DEBUG)
931         tmp = __ao2_alloc_debug(sizeof(*tmp), ast_channel_destructor, "", file, line,
932                 function, 1);
933 #elif defined(__AST_DEBUG_MALLOC)
934         tmp = __ao2_alloc_debug(sizeof(*tmp), ast_channel_destructor, "", file, line,
935                 function, 0);
936 #else
937         tmp = ao2_alloc(sizeof(*tmp), ast_channel_destructor);
938 #endif
939         if (!tmp) {
940                 /* Channel structure allocation failure. */
941                 return NULL;
942         }
943         if (!(tmp->nativeformats = ast_format_cap_alloc())) {
944                 ao2_ref(tmp, -1);
945                 /* format capabilities structure allocation failure */
946                 return NULL;
947         }
948
949         /*
950          * Init file descriptors to unopened state so
951          * the destructor can know not to close them.
952          */
953         tmp->timingfd = -1;
954         for (x = 0; x < ARRAY_LEN(tmp->alertpipe); ++x) {
955                 tmp->alertpipe[x] = -1;
956         }
957         for (x = 0; x < ARRAY_LEN(tmp->fds); ++x) {
958                 tmp->fds[x] = -1;
959         }
960 #ifdef HAVE_EPOLL
961         tmp->epfd = epoll_create(25);
962 #endif
963
964         if (!(tmp->sched = ast_sched_context_create())) {
965                 ast_log(LOG_WARNING, "Channel allocation failed: Unable to create schedule context\n");
966                 return ast_channel_unref(tmp);
967         }
968         
969         ast_party_dialed_init(&tmp->dialed);
970         ast_party_caller_init(&tmp->caller);
971         ast_party_connected_line_init(&tmp->connected);
972         ast_party_redirecting_init(&tmp->redirecting);
973
974         if (cid_name) {
975                 tmp->caller.id.name.valid = 1;
976                 tmp->caller.id.name.str = ast_strdup(cid_name);
977                 if (!tmp->caller.id.name.str) {
978                         return ast_channel_unref(tmp);
979                 }
980         }
981         if (cid_num) {
982                 tmp->caller.id.number.valid = 1;
983                 tmp->caller.id.number.str = ast_strdup(cid_num);
984                 if (!tmp->caller.id.number.str) {
985                         return ast_channel_unref(tmp);
986                 }
987         }
988
989         if ((tmp->timer = ast_timer_open())) {
990                 if (strcmp(ast_timer_get_name(tmp->timer), "timerfd")) {
991                         needqueue = 0;
992                 }
993                 tmp->timingfd = ast_timer_fd(tmp->timer);
994         }
995
996         if (needqueue) {
997                 if (pipe(tmp->alertpipe)) {
998                         ast_log(LOG_WARNING, "Channel allocation failed: Can't create alert pipe! Try increasing max file descriptors with ulimit -n\n");
999                         return ast_channel_unref(tmp);
1000                 } else {
1001                         flags = fcntl(tmp->alertpipe[0], F_GETFL);
1002                         if (fcntl(tmp->alertpipe[0], F_SETFL, flags | O_NONBLOCK) < 0) {
1003                                 ast_log(LOG_WARNING, "Channel allocation failed: Unable to set alertpipe nonblocking! (%d: %s)\n", errno, strerror(errno));
1004                                 return ast_channel_unref(tmp);
1005                         }
1006                         flags = fcntl(tmp->alertpipe[1], F_GETFL);
1007                         if (fcntl(tmp->alertpipe[1], F_SETFL, flags | O_NONBLOCK) < 0) {
1008                                 ast_log(LOG_WARNING, "Channel allocation failed: Unable to set alertpipe nonblocking! (%d: %s)\n", errno, strerror(errno));
1009                                 return ast_channel_unref(tmp);
1010                         }
1011                 }
1012         }
1013
1014         /*
1015          * This is the last place the channel constructor can fail.
1016          *
1017          * The destructor takes advantage of this fact to ensure that the
1018          * AST_CEL_CHANNEL_END is not posted if we have not posted the
1019          * AST_CEL_CHANNEL_START yet.
1020          */
1021         if ((ast_string_field_init(tmp, 128))) {
1022                 return ast_channel_unref(tmp);
1023         }
1024
1025         /* Always watch the alertpipe */
1026         ast_channel_set_fd(tmp, AST_ALERT_FD, tmp->alertpipe[0]);
1027         /* And timing pipe */
1028         ast_channel_set_fd(tmp, AST_TIMING_FD, tmp->timingfd);
1029
1030         /* Initial state */
1031         tmp->_state = state;
1032
1033         tmp->streamid = -1;
1034         
1035         tmp->fin = global_fin;
1036         tmp->fout = global_fout;
1037
1038         if (ast_strlen_zero(ast_config_AST_SYSTEM_NAME)) {
1039                 ast_string_field_build(tmp, uniqueid, "%li.%d", (long) time(NULL), 
1040                         ast_atomic_fetchadd_int(&uniqueint, 1));
1041         } else {
1042                 ast_string_field_build(tmp, uniqueid, "%s-%li.%d", ast_config_AST_SYSTEM_NAME, 
1043                         (long) time(NULL), ast_atomic_fetchadd_int(&uniqueint, 1));
1044         }
1045
1046         if (!ast_strlen_zero(linkedid)) {
1047                 ast_string_field_set(tmp, linkedid, linkedid);
1048         } else {
1049                 ast_string_field_set(tmp, linkedid, tmp->uniqueid);
1050         }
1051
1052         if (!ast_strlen_zero(name_fmt)) {
1053                 char *slash, *slash2;
1054                 /* Almost every channel is calling this function, and setting the name via the ast_string_field_build() call.
1055                  * And they all use slightly different formats for their name string.
1056                  * This means, to set the name here, we have to accept variable args, and call the string_field_build from here.
1057                  * This means, that the stringfields must have a routine that takes the va_lists directly, and 
1058                  * uses them to build the string, instead of forming the va_lists internally from the vararg ... list.
1059                  * This new function was written so this can be accomplished.
1060                  */
1061                 ast_channel_name_set_va(tmp, name_fmt, ap);
1062                 tech = ast_strdupa(ast_channel_name(tmp));
1063                 if ((slash = strchr(tech, '/'))) {
1064                         if ((slash2 = strchr(slash + 1, '/'))) {
1065                                 tech2 = slash + 1;
1066                                 *slash2 = '\0';
1067                         }
1068                         *slash = '\0';
1069                 }
1070         } else {
1071                 /*
1072                  * Start the string with '-' so it becomes an empty string
1073                  * in the destructor.
1074                  */
1075                 ast_channel_name_set(tmp, "-**Unknown**");
1076         }
1077
1078         /* Reminder for the future: under what conditions do we NOT want to track cdrs on channels? */
1079
1080         /* These 4 variables need to be set up for the cdr_init() to work right */
1081         if (amaflag)
1082                 tmp->amaflags = amaflag;
1083         else
1084                 tmp->amaflags = ast_default_amaflags;
1085         
1086         if (!ast_strlen_zero(acctcode))
1087                 ast_string_field_set(tmp, accountcode, acctcode);
1088         else
1089                 ast_string_field_set(tmp, accountcode, ast_default_accountcode);
1090                 
1091         if (!ast_strlen_zero(context))
1092                 ast_copy_string(tmp->context, context, sizeof(tmp->context));
1093         else
1094                 strcpy(tmp->context, "default");
1095
1096         if (!ast_strlen_zero(exten))
1097                 ast_copy_string(tmp->exten, exten, sizeof(tmp->exten));
1098         else
1099                 strcpy(tmp->exten, "s");
1100
1101         tmp->priority = 1;
1102
1103         tmp->cdr = ast_cdr_alloc();
1104         ast_cdr_init(tmp->cdr, tmp);
1105         ast_cdr_start(tmp->cdr);
1106
1107         ast_cel_report_event(tmp, AST_CEL_CHANNEL_START, NULL, NULL, NULL);
1108
1109         headp = &tmp->varshead;
1110         AST_LIST_HEAD_INIT_NOLOCK(headp);
1111         
1112         AST_LIST_HEAD_INIT_NOLOCK(&tmp->datastores);
1113
1114         AST_LIST_HEAD_INIT_NOLOCK(&tmp->autochans);
1115         
1116         ast_string_field_set(tmp, language, defaultlanguage);
1117
1118         tmp->tech = &null_tech;
1119
1120         ao2_link(channels, tmp);
1121
1122         /*
1123          * And now, since the channel structure is built, and has its name, let's
1124          * call the manager event generator with this Newchannel event. This is the
1125          * proper and correct place to make this call, but you sure do have to pass
1126          * a lot of data into this func to do it here!
1127          */
1128         if (ast_get_channel_tech(tech) || (tech2 && ast_get_channel_tech(tech2))) {
1129                 ast_manager_event(tmp, EVENT_FLAG_CALL, "Newchannel",
1130                         "Channel: %s\r\n"
1131                         "ChannelState: %d\r\n"
1132                         "ChannelStateDesc: %s\r\n"
1133                         "CallerIDNum: %s\r\n"
1134                         "CallerIDName: %s\r\n"
1135                         "AccountCode: %s\r\n"
1136                         "Exten: %s\r\n"
1137                         "Context: %s\r\n"
1138                         "Uniqueid: %s\r\n",
1139                         ast_channel_name(tmp), 
1140                         state, 
1141                         ast_state2str(state),
1142                         S_OR(cid_num, ""),
1143                         S_OR(cid_name, ""),
1144                         tmp->accountcode,
1145                         S_OR(exten, ""),
1146                         S_OR(context, ""),
1147                         tmp->uniqueid);
1148         }
1149
1150         return tmp;
1151 }
1152
1153 struct ast_channel *__ast_channel_alloc(int needqueue, int state, const char *cid_num,
1154                                         const char *cid_name, const char *acctcode,
1155                                         const char *exten, const char *context,
1156                                         const char *linkedid, const int amaflag,
1157                                         const char *file, int line, const char *function,
1158                                         const char *name_fmt, ...)
1159 {
1160         va_list ap;
1161         struct ast_channel *result;
1162
1163         va_start(ap, name_fmt);
1164         result = __ast_channel_alloc_ap(needqueue, state, cid_num, cid_name, acctcode, exten, context,
1165                                         linkedid, amaflag, file, line, function, name_fmt, ap);
1166         va_end(ap);
1167
1168         return result;
1169 }
1170
1171 /* only do the minimum amount of work needed here to make a channel
1172  * structure that can be used to expand channel vars */
1173 #if defined(REF_DEBUG) || defined(__AST_DEBUG_MALLOC)
1174 struct ast_channel *__ast_dummy_channel_alloc(const char *file, int line, const char *function)
1175 #else
1176 struct ast_channel *ast_dummy_channel_alloc(void)
1177 #endif
1178 {
1179         struct ast_channel *tmp;
1180         struct varshead *headp;
1181
1182 #if defined(REF_DEBUG)
1183         tmp = __ao2_alloc_debug(sizeof(*tmp), ast_dummy_channel_destructor, "dummy channel",
1184                 file, line, function, 1);
1185 #elif defined(__AST_DEBUG_MALLOC)
1186         tmp = __ao2_alloc_debug(sizeof(*tmp), ast_dummy_channel_destructor, "dummy channel",
1187                 file, line, function, 0);
1188 #else
1189         tmp = ao2_alloc(sizeof(*tmp), ast_dummy_channel_destructor);
1190 #endif
1191         if (!tmp) {
1192                 /* Dummy channel structure allocation failure. */
1193                 return NULL;
1194         }
1195
1196         if ((ast_string_field_init(tmp, 128))) {
1197                 return ast_channel_unref(tmp);
1198         }
1199
1200         headp = &tmp->varshead;
1201         AST_LIST_HEAD_INIT_NOLOCK(headp);
1202
1203         return tmp;
1204 }
1205
1206 static int __ast_queue_frame(struct ast_channel *chan, struct ast_frame *fin, int head, struct ast_frame *after)
1207 {
1208         struct ast_frame *f;
1209         struct ast_frame *cur;
1210         unsigned int new_frames = 0;
1211         unsigned int new_voice_frames = 0;
1212         unsigned int queued_frames = 0;
1213         unsigned int queued_voice_frames = 0;
1214         AST_LIST_HEAD_NOLOCK(, ast_frame) frames;
1215
1216         ast_channel_lock(chan);
1217
1218         /*
1219          * Check the last frame on the queue if we are queuing the new
1220          * frames after it.
1221          */
1222         cur = AST_LIST_LAST(&chan->readq);
1223         if (cur && cur->frametype == AST_FRAME_CONTROL && !head && (!after || after == cur)) {
1224                 switch (cur->subclass.integer) {
1225                 case AST_CONTROL_END_OF_Q:
1226                         if (fin->frametype == AST_FRAME_CONTROL
1227                                 && fin->subclass.integer == AST_CONTROL_HANGUP) {
1228                                 /*
1229                                  * Destroy the end-of-Q marker frame so we can queue the hangup
1230                                  * frame in its place.
1231                                  */
1232                                 AST_LIST_REMOVE(&chan->readq, cur, frame_list);
1233                                 ast_frfree(cur);
1234
1235                                 /*
1236                                  * This has degenerated to a normal queue append anyway.  Since
1237                                  * we just destroyed the last frame in the queue we must make
1238                                  * sure that "after" is NULL or bad things will happen.
1239                                  */
1240                                 after = NULL;
1241                                 break;
1242                         }
1243                         /* Fall through */
1244                 case AST_CONTROL_HANGUP:
1245                         /* Don't queue anything. */
1246                         ast_channel_unlock(chan);
1247                         return 0;
1248                 default:
1249                         break;
1250                 }
1251         }
1252
1253         /* Build copies of all the new frames and count them */
1254         AST_LIST_HEAD_INIT_NOLOCK(&frames);
1255         for (cur = fin; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
1256                 if (!(f = ast_frdup(cur))) {
1257                         if (AST_LIST_FIRST(&frames)) {
1258                                 ast_frfree(AST_LIST_FIRST(&frames));
1259                         }
1260                         ast_channel_unlock(chan);
1261                         return -1;
1262                 }
1263
1264                 AST_LIST_INSERT_TAIL(&frames, f, frame_list);
1265                 new_frames++;
1266                 if (f->frametype == AST_FRAME_VOICE) {
1267                         new_voice_frames++;
1268                 }
1269         }
1270
1271         /* Count how many frames exist on the queue */
1272         AST_LIST_TRAVERSE(&chan->readq, cur, frame_list) {
1273                 queued_frames++;
1274                 if (cur->frametype == AST_FRAME_VOICE) {
1275                         queued_voice_frames++;
1276                 }
1277         }
1278
1279         if ((queued_frames + new_frames > 128 || queued_voice_frames + new_voice_frames > 96)) {
1280                 int count = 0;
1281                 ast_log(LOG_WARNING, "Exceptionally long %squeue length queuing to %s\n", queued_frames + new_frames > 128 ? "" : "voice ", ast_channel_name(chan));
1282                 AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->readq, cur, frame_list) {
1283                         /* Save the most recent frame */
1284                         if (!AST_LIST_NEXT(cur, frame_list)) {
1285                                 break;
1286                         } else if (cur->frametype == AST_FRAME_VOICE || cur->frametype == AST_FRAME_VIDEO || cur->frametype == AST_FRAME_NULL) {
1287                                 if (++count > 64) {
1288                                         break;
1289                                 }
1290                                 AST_LIST_REMOVE_CURRENT(frame_list);
1291                                 ast_frfree(cur);
1292                         }
1293                 }
1294                 AST_LIST_TRAVERSE_SAFE_END;
1295         }
1296
1297         if (after) {
1298                 AST_LIST_INSERT_LIST_AFTER(&chan->readq, &frames, after, frame_list);
1299         } else {
1300                 if (head) {
1301                         AST_LIST_APPEND_LIST(&frames, &chan->readq, frame_list);
1302                         AST_LIST_HEAD_INIT_NOLOCK(&chan->readq);
1303                 }
1304                 AST_LIST_APPEND_LIST(&chan->readq, &frames, frame_list);
1305         }
1306
1307         if (chan->alertpipe[1] > -1) {
1308                 int blah[new_frames];
1309
1310                 memset(blah, 1, sizeof(blah));
1311                 if (write(chan->alertpipe[1], &blah, sizeof(blah)) != (sizeof(blah))) {
1312                         ast_log(LOG_WARNING, "Unable to write to alert pipe on %s (qlen = %d): %s!\n",
1313                                 ast_channel_name(chan), queued_frames, strerror(errno));
1314                 }
1315         } else if (chan->timingfd > -1) {
1316                 ast_timer_enable_continuous(chan->timer);
1317         } else if (ast_test_flag(chan, AST_FLAG_BLOCKING)) {
1318                 pthread_kill(chan->blocker, SIGURG);
1319         }
1320
1321         ast_channel_unlock(chan);
1322
1323         return 0;
1324 }
1325
1326 int ast_queue_frame(struct ast_channel *chan, struct ast_frame *fin)
1327 {
1328         return __ast_queue_frame(chan, fin, 0, NULL);
1329 }
1330
1331 int ast_queue_frame_head(struct ast_channel *chan, struct ast_frame *fin)
1332 {
1333         return __ast_queue_frame(chan, fin, 1, NULL);
1334 }
1335
1336 /*! \brief Queue a hangup frame for channel */
1337 int ast_queue_hangup(struct ast_channel *chan)
1338 {
1339         struct ast_frame f = { AST_FRAME_CONTROL, .subclass.integer = AST_CONTROL_HANGUP };
1340         /* Yeah, let's not change a lock-critical value without locking */
1341         if (!ast_channel_trylock(chan)) {
1342                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
1343                 manager_event(EVENT_FLAG_CALL, "HangupRequest",
1344                         "Channel: %s\r\n"
1345                         "Uniqueid: %s\r\n",
1346                         ast_channel_name(chan),
1347                         chan->uniqueid);
1348                 ast_channel_unlock(chan);
1349         }
1350         return ast_queue_frame(chan, &f);
1351 }
1352
1353 /*! \brief Queue a hangup frame for channel */
1354 int ast_queue_hangup_with_cause(struct ast_channel *chan, int cause)
1355 {
1356         struct ast_frame f = { AST_FRAME_CONTROL, .subclass.integer = AST_CONTROL_HANGUP };
1357
1358         if (cause >= 0)
1359                 f.data.uint32 = cause;
1360
1361         /* Yeah, let's not change a lock-critical value without locking */
1362         if (!ast_channel_trylock(chan)) {
1363                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
1364                 if (cause < 0)
1365                         f.data.uint32 = chan->hangupcause;
1366
1367                 manager_event(EVENT_FLAG_CALL, "HangupRequest",
1368                         "Channel: %s\r\n"
1369                         "Uniqueid: %s\r\n"
1370                         "Cause: %d\r\n",
1371                         ast_channel_name(chan),
1372                         chan->uniqueid,
1373                         cause);
1374                 ast_channel_unlock(chan);
1375         }
1376
1377         return ast_queue_frame(chan, &f);
1378 }
1379
1380 /*! \brief Queue a control frame */
1381 int ast_queue_control(struct ast_channel *chan, enum ast_control_frame_type control)
1382 {
1383         struct ast_frame f = { AST_FRAME_CONTROL, .subclass.integer = control };
1384         return ast_queue_frame(chan, &f);
1385 }
1386
1387 /*! \brief Queue a control frame with payload */
1388 int ast_queue_control_data(struct ast_channel *chan, enum ast_control_frame_type control,
1389                            const void *data, size_t datalen)
1390 {
1391         struct ast_frame f = { AST_FRAME_CONTROL, .subclass.integer = control, .data.ptr = (void *) data, .datalen = datalen };
1392         return ast_queue_frame(chan, &f);
1393 }
1394
1395 /*! \brief Set defer DTMF flag on channel */
1396 int ast_channel_defer_dtmf(struct ast_channel *chan)
1397 {
1398         int pre = 0;
1399
1400         if (chan) {
1401                 pre = ast_test_flag(chan, AST_FLAG_DEFER_DTMF);
1402                 ast_set_flag(chan, AST_FLAG_DEFER_DTMF);
1403         }
1404         return pre;
1405 }
1406
1407 /*! \brief Unset defer DTMF flag on channel */
1408 void ast_channel_undefer_dtmf(struct ast_channel *chan)
1409 {
1410         if (chan)
1411                 ast_clear_flag(chan, AST_FLAG_DEFER_DTMF);
1412 }
1413
1414 struct ast_channel *ast_channel_callback(ao2_callback_data_fn *cb_fn, void *arg,
1415                 void *data, int ao2_flags)
1416 {
1417         return ao2_callback_data(channels, ao2_flags, cb_fn, arg, data);
1418 }
1419
1420 static int ast_channel_by_name_cb(void *obj, void *arg, void *data, int flags)
1421 {
1422         struct ast_channel *chan = obj;
1423         const char *name = arg;
1424         size_t name_len = *(size_t *)data;
1425         int ret = CMP_MATCH;
1426
1427         if (ast_strlen_zero(name)) {
1428                 ast_log(LOG_ERROR, "BUG! Must supply a name, or a channel with a name to match on!\n");
1429                 return CMP_STOP;
1430         }
1431
1432         ast_channel_lock(chan);
1433
1434         if ((!name_len && strcasecmp(ast_channel_name(chan), name)) || (name_len && strncasecmp(ast_channel_name(chan), name, name_len))) {
1435                 ret = 0; /* name match failed, keep looking */
1436         }
1437         ast_channel_unlock(chan);
1438
1439         return ret;
1440 }
1441
1442 static int ast_channel_by_exten_cb(void *obj, void *arg, void *data, int flags)
1443 {
1444         struct ast_channel *chan = obj;
1445         char *context = arg, *exten = data;
1446         int ret = CMP_MATCH;
1447
1448         if (ast_strlen_zero(exten) || ast_strlen_zero(context)) {
1449                 ast_log(LOG_ERROR, "BUG! Must have a context and extension to match!\n");
1450                 return CMP_STOP;
1451         }
1452
1453         ast_channel_lock(chan);
1454         if (strcasecmp(chan->context, context) && strcasecmp(chan->macrocontext, context)) {
1455                 ret = 0; /* Context match failed, continue */
1456         } else if (strcasecmp(chan->exten, exten) && strcasecmp(chan->macroexten, exten)) {
1457                 ret = 0; /* Extension match failed, continue */
1458         }
1459         ast_channel_unlock(chan);
1460
1461         return ret;
1462 }
1463
1464 static int ast_channel_by_uniqueid_cb(void *obj, void *arg, void *data, int flags)
1465 {
1466         struct ast_channel *chan = obj;
1467         char *uniqueid = arg;
1468         size_t name_len = *(size_t *) data;
1469         int ret = CMP_MATCH;
1470
1471         if (ast_strlen_zero(uniqueid)) {
1472                 ast_log(LOG_ERROR, "BUG! Must have a uniqueid to match!\n");
1473                 return CMP_STOP;
1474         }
1475
1476         ast_channel_lock(chan);
1477         if ((!name_len && strcasecmp(chan->uniqueid, uniqueid)) ||
1478                         (name_len && strncasecmp(chan->uniqueid, uniqueid, name_len))) {
1479                 ret = 0;
1480         }
1481         ast_channel_unlock(chan);
1482
1483         return ret;
1484 }
1485
1486 struct ast_channel_iterator {
1487         /* storage for non-dynamically allocated iterator */
1488         struct ao2_iterator simple_iterator;
1489         /* pointer to the actual iterator (simple_iterator or a dynamically
1490          * allocated iterator)
1491          */
1492         struct ao2_iterator *active_iterator;
1493 };
1494
1495 struct ast_channel_iterator *ast_channel_iterator_destroy(struct ast_channel_iterator *i)
1496 {
1497         ao2_iterator_destroy(i->active_iterator);
1498         ast_free(i);
1499
1500         return NULL;
1501 }
1502
1503 static struct ast_channel_iterator *channel_iterator_search(const char *name,
1504         size_t name_len, const char *exten, const char *context)
1505 {
1506         struct ast_channel_iterator *i;
1507         char *l_name = (char *) name;
1508         char *l_exten = (char *) exten;
1509         char *l_context = (char *) context;
1510
1511         if (!(i = ast_calloc(1, sizeof(*i)))) {
1512                 return NULL;
1513         }
1514
1515         if (ast_strlen_zero(name)
1516                 && !(i->active_iterator = (void *) ast_channel_callback(ast_channel_by_exten_cb,
1517                         l_context, l_exten, OBJ_MULTIPLE))) {
1518                 ast_free(i);
1519                 return NULL;
1520         } else if (!(i->active_iterator = (void *) ast_channel_callback(ast_channel_by_name_cb,
1521                 l_name, &name_len,
1522                 OBJ_MULTIPLE | (name_len == 0 /* match the whole word, so optimize */ ? OBJ_KEY : 0)))) {
1523                 ast_free(i);
1524                 return NULL;
1525         }
1526
1527         return i;
1528 }
1529
1530 struct ast_channel_iterator *ast_channel_iterator_by_exten_new(const char *exten, const char *context)
1531 {
1532         return channel_iterator_search(NULL, 0, exten, context);
1533 }
1534
1535 struct ast_channel_iterator *ast_channel_iterator_by_name_new(const char *name, size_t name_len)
1536 {
1537         return channel_iterator_search(name, name_len, NULL, NULL);
1538 }
1539
1540 struct ast_channel_iterator *ast_channel_iterator_all_new(void)
1541 {
1542         struct ast_channel_iterator *i;
1543
1544         if (!(i = ast_calloc(1, sizeof(*i)))) {
1545                 return NULL;
1546         }
1547
1548         i->simple_iterator = ao2_iterator_init(channels, 0);
1549         i->active_iterator = &i->simple_iterator;
1550
1551         return i;
1552 }
1553
1554 struct ast_channel *ast_channel_iterator_next(struct ast_channel_iterator *i)
1555 {
1556         return ao2_iterator_next(i->active_iterator);
1557 }
1558
1559 /* Legacy function, not currently used for lookups, but we need a cmp_fn */
1560 static int ast_channel_cmp_cb(void *obj, void *arg, int flags)
1561 {
1562         struct ast_channel *cmp_args = arg;
1563         size_t name_len;
1564         int ret = CMP_MATCH;
1565
1566         /* This is sort of a hack.  Basically, we're using an arbitrary field
1567          * in ast_channel to pass the name_len for a prefix match.  If this
1568          * gets changed, then the uses of ao2_find() must be changed, too. */
1569         name_len = cmp_args->rings;
1570
1571         if (!ast_strlen_zero(ast_channel_name(cmp_args))) { /* match by name */
1572                 ret = ast_channel_by_name_cb(obj, arg, &name_len, flags);
1573         } else if (!ast_strlen_zero(cmp_args->exten)) {
1574                 ret = ast_channel_by_exten_cb(obj, cmp_args->context, cmp_args->exten, flags);
1575         } else if (!ast_strlen_zero(cmp_args->uniqueid)) {
1576                 ret = ast_channel_by_uniqueid_cb(obj, (void *) cmp_args->uniqueid, &name_len, flags);
1577         } else {
1578                 ret = 0;
1579         }
1580
1581         return ret;
1582 }
1583
1584 static struct ast_channel *ast_channel_get_full(const char *name, size_t name_len,
1585         const char *exten, const char *context)
1586 {
1587         struct ast_channel *chan;
1588         char *l_name = (char *) name;
1589         char *l_exten = (char *) exten;
1590         char *l_context = (char *) context;
1591
1592         if (ast_strlen_zero(name)
1593                 && (chan = ast_channel_callback(ast_channel_by_exten_cb, l_context, l_exten, 0))) {
1594                 return chan;
1595         } else if ((chan = ast_channel_callback(ast_channel_by_name_cb, l_name, &name_len,
1596                 (name_len == 0) /* optimize if it is a complete name match */ ? OBJ_KEY : 0))) {
1597                 return chan;
1598         }
1599
1600         /* If we haven't found by name or context yet and don't have a name, give up. */
1601         if (!name) {
1602                 return NULL;
1603         }
1604
1605         /* If name was specified, but the result was NULL, 
1606          * try a search on uniqueid, instead. */
1607         return ast_channel_callback(ast_channel_by_uniqueid_cb, l_name, &name_len, 0);
1608 }
1609
1610 struct ast_channel *ast_channel_get_by_name(const char *name)
1611 {
1612         return ast_channel_get_full(name, 0, NULL, NULL);
1613 }
1614
1615 struct ast_channel *ast_channel_get_by_name_prefix(const char *name, size_t name_len)
1616 {
1617         return ast_channel_get_full(name, name_len, NULL, NULL);
1618 }
1619
1620 struct ast_channel *ast_channel_get_by_exten(const char *exten, const char *context)
1621 {
1622         return ast_channel_get_full(NULL, 0, exten, context);
1623 }
1624
1625 int ast_is_deferrable_frame(const struct ast_frame *frame)
1626 {
1627         /* Do not add a default entry in this switch statement.  Each new
1628          * frame type should be addressed directly as to whether it should
1629          * be queued up or not.
1630          */
1631         switch (frame->frametype) {
1632         case AST_FRAME_CONTROL:
1633         case AST_FRAME_TEXT:
1634         case AST_FRAME_IMAGE:
1635         case AST_FRAME_HTML:
1636                 return 1;
1637
1638         case AST_FRAME_DTMF_END:
1639         case AST_FRAME_DTMF_BEGIN:
1640         case AST_FRAME_VOICE:
1641         case AST_FRAME_VIDEO:
1642         case AST_FRAME_NULL:
1643         case AST_FRAME_IAX:
1644         case AST_FRAME_CNG:
1645         case AST_FRAME_MODEM:
1646                 return 0;
1647         }
1648         return 0;
1649 }
1650
1651 /*! \brief Wait, look for hangups and condition arg */
1652 int ast_safe_sleep_conditional(struct ast_channel *chan, int ms, int (*cond)(void*), void *data)
1653 {
1654         struct ast_frame *f;
1655         struct ast_silence_generator *silgen = NULL;
1656         int res = 0;
1657         AST_LIST_HEAD_NOLOCK(, ast_frame) deferred_frames;
1658
1659         AST_LIST_HEAD_INIT_NOLOCK(&deferred_frames);
1660
1661         /* If no other generator is present, start silencegen while waiting */
1662         if (ast_opt_transmit_silence && !chan->generatordata) {
1663                 silgen = ast_channel_start_silence_generator(chan);
1664         }
1665
1666         while (ms > 0) {
1667                 struct ast_frame *dup_f = NULL;
1668                 if (cond && ((*cond)(data) == 0)) {
1669                         break;
1670                 }
1671                 ms = ast_waitfor(chan, ms);
1672                 if (ms < 0) {
1673                         res = -1;
1674                         break;
1675                 }
1676                 if (ms > 0) {
1677                         f = ast_read(chan);
1678                         if (!f) {
1679                                 res = -1;
1680                                 break;
1681                         }
1682
1683                         if (!ast_is_deferrable_frame(f)) {
1684                                 ast_frfree(f);
1685                                 continue;
1686                         }
1687                         
1688                         if ((dup_f = ast_frisolate(f))) {
1689                                 if (dup_f != f) {
1690                                         ast_frfree(f);
1691                                 }
1692                                 AST_LIST_INSERT_HEAD(&deferred_frames, dup_f, frame_list);
1693                         }
1694                 }
1695         }
1696
1697         /* stop silgen if present */
1698         if (silgen) {
1699                 ast_channel_stop_silence_generator(chan, silgen);
1700         }
1701
1702         /* We need to free all the deferred frames, but we only need to
1703          * queue the deferred frames if there was no error and no
1704          * hangup was received
1705          */
1706         ast_channel_lock(chan);
1707         while ((f = AST_LIST_REMOVE_HEAD(&deferred_frames, frame_list))) {
1708                 if (!res) {
1709                         ast_queue_frame_head(chan, f);
1710                 }
1711                 ast_frfree(f);
1712         }
1713         ast_channel_unlock(chan);
1714
1715         return res;
1716 }
1717
1718 /*! \brief Wait, look for hangups */
1719 int ast_safe_sleep(struct ast_channel *chan, int ms)
1720 {
1721         return ast_safe_sleep_conditional(chan, ms, NULL, NULL);
1722 }
1723
1724 struct ast_channel *ast_channel_release(struct ast_channel *chan)
1725 {
1726         /* Safe, even if already unlinked. */
1727         ao2_unlink(channels, chan);
1728         return ast_channel_unref(chan);
1729 }
1730
1731 void ast_party_name_init(struct ast_party_name *init)
1732 {
1733         init->str = NULL;
1734         init->char_set = AST_PARTY_CHAR_SET_ISO8859_1;
1735         init->presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
1736         init->valid = 0;
1737 }
1738
1739 void ast_party_name_copy(struct ast_party_name *dest, const struct ast_party_name *src)
1740 {
1741         if (dest == src) {
1742                 /* Don't copy to self */
1743                 return;
1744         }
1745
1746         ast_free(dest->str);
1747         dest->str = ast_strdup(src->str);
1748         dest->char_set = src->char_set;
1749         dest->presentation = src->presentation;
1750         dest->valid = src->valid;
1751 }
1752
1753 void ast_party_name_set_init(struct ast_party_name *init, const struct ast_party_name *guide)
1754 {
1755         init->str = NULL;
1756         init->char_set = guide->char_set;
1757         init->presentation = guide->presentation;
1758         init->valid = guide->valid;
1759 }
1760
1761 void ast_party_name_set(struct ast_party_name *dest, const struct ast_party_name *src)
1762 {
1763         if (dest == src) {
1764                 /* Don't set to self */
1765                 return;
1766         }
1767
1768         if (src->str && src->str != dest->str) {
1769                 ast_free(dest->str);
1770                 dest->str = ast_strdup(src->str);
1771         }
1772
1773         dest->char_set = src->char_set;
1774         dest->presentation = src->presentation;
1775         dest->valid = src->valid;
1776 }
1777
1778 void ast_party_name_free(struct ast_party_name *doomed)
1779 {
1780         ast_free(doomed->str);
1781         doomed->str = NULL;
1782 }
1783
1784 void ast_party_number_init(struct ast_party_number *init)
1785 {
1786         init->str = NULL;
1787         init->plan = 0;/* Unknown */
1788         init->presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
1789         init->valid = 0;
1790 }
1791
1792 void ast_party_number_copy(struct ast_party_number *dest, const struct ast_party_number *src)
1793 {
1794         if (dest == src) {
1795                 /* Don't copy to self */
1796                 return;
1797         }
1798
1799         ast_free(dest->str);
1800         dest->str = ast_strdup(src->str);
1801         dest->plan = src->plan;
1802         dest->presentation = src->presentation;
1803         dest->valid = src->valid;
1804 }
1805
1806 void ast_party_number_set_init(struct ast_party_number *init, const struct ast_party_number *guide)
1807 {
1808         init->str = NULL;
1809         init->plan = guide->plan;
1810         init->presentation = guide->presentation;
1811         init->valid = guide->valid;
1812 }
1813
1814 void ast_party_number_set(struct ast_party_number *dest, const struct ast_party_number *src)
1815 {
1816         if (dest == src) {
1817                 /* Don't set to self */
1818                 return;
1819         }
1820
1821         if (src->str && src->str != dest->str) {
1822                 ast_free(dest->str);
1823                 dest->str = ast_strdup(src->str);
1824         }
1825
1826         dest->plan = src->plan;
1827         dest->presentation = src->presentation;
1828         dest->valid = src->valid;
1829 }
1830
1831 void ast_party_number_free(struct ast_party_number *doomed)
1832 {
1833         ast_free(doomed->str);
1834         doomed->str = NULL;
1835 }
1836
1837 void ast_party_subaddress_init(struct ast_party_subaddress *init)
1838 {
1839         init->str = NULL;
1840         init->type = 0;
1841         init->odd_even_indicator = 0;
1842         init->valid = 0;
1843 }
1844
1845 void ast_party_subaddress_copy(struct ast_party_subaddress *dest, const struct ast_party_subaddress *src)
1846 {
1847         if (dest == src) {
1848                 /* Don't copy to self */
1849                 return;
1850         }
1851
1852         ast_free(dest->str);
1853         dest->str = ast_strdup(src->str);
1854         dest->type = src->type;
1855         dest->odd_even_indicator = src->odd_even_indicator;
1856         dest->valid = src->valid;
1857 }
1858
1859 void ast_party_subaddress_set_init(struct ast_party_subaddress *init, const struct ast_party_subaddress *guide)
1860 {
1861         init->str = NULL;
1862         init->type = guide->type;
1863         init->odd_even_indicator = guide->odd_even_indicator;
1864         init->valid = guide->valid;
1865 }
1866
1867 void ast_party_subaddress_set(struct ast_party_subaddress *dest, const struct ast_party_subaddress *src)
1868 {
1869         if (dest == src) {
1870                 /* Don't set to self */
1871                 return;
1872         }
1873
1874         if (src->str && src->str != dest->str) {
1875                 ast_free(dest->str);
1876                 dest->str = ast_strdup(src->str);
1877         }
1878
1879         dest->type = src->type;
1880         dest->odd_even_indicator = src->odd_even_indicator;
1881         dest->valid = src->valid;
1882 }
1883
1884 void ast_party_subaddress_free(struct ast_party_subaddress *doomed)
1885 {
1886         ast_free(doomed->str);
1887         doomed->str = NULL;
1888 }
1889
1890 void ast_party_id_init(struct ast_party_id *init)
1891 {
1892         ast_party_name_init(&init->name);
1893         ast_party_number_init(&init->number);
1894         ast_party_subaddress_init(&init->subaddress);
1895         init->tag = NULL;
1896 }
1897
1898 void ast_party_id_copy(struct ast_party_id *dest, const struct ast_party_id *src)
1899 {
1900         if (dest == src) {
1901                 /* Don't copy to self */
1902                 return;
1903         }
1904
1905         ast_party_name_copy(&dest->name, &src->name);
1906         ast_party_number_copy(&dest->number, &src->number);
1907         ast_party_subaddress_copy(&dest->subaddress, &src->subaddress);
1908
1909         ast_free(dest->tag);
1910         dest->tag = ast_strdup(src->tag);
1911 }
1912
1913 void ast_party_id_set_init(struct ast_party_id *init, const struct ast_party_id *guide)
1914 {
1915         ast_party_name_set_init(&init->name, &guide->name);
1916         ast_party_number_set_init(&init->number, &guide->number);
1917         ast_party_subaddress_set_init(&init->subaddress, &guide->subaddress);
1918         init->tag = NULL;
1919 }
1920
1921 void ast_party_id_set(struct ast_party_id *dest, const struct ast_party_id *src, const struct ast_set_party_id *update)
1922 {
1923         if (dest == src) {
1924                 /* Don't set to self */
1925                 return;
1926         }
1927
1928         if (!update || update->name) {
1929                 ast_party_name_set(&dest->name, &src->name);
1930         }
1931         if (!update || update->number) {
1932                 ast_party_number_set(&dest->number, &src->number);
1933         }
1934         if (!update || update->subaddress) {
1935                 ast_party_subaddress_set(&dest->subaddress, &src->subaddress);
1936         }
1937
1938         if (src->tag && src->tag != dest->tag) {
1939                 ast_free(dest->tag);
1940                 dest->tag = ast_strdup(src->tag);
1941         }
1942 }
1943
1944 void ast_party_id_free(struct ast_party_id *doomed)
1945 {
1946         ast_party_name_free(&doomed->name);
1947         ast_party_number_free(&doomed->number);
1948         ast_party_subaddress_free(&doomed->subaddress);
1949
1950         ast_free(doomed->tag);
1951         doomed->tag = NULL;
1952 }
1953
1954 int ast_party_id_presentation(const struct ast_party_id *id)
1955 {
1956         int number_priority;
1957         int number_value;
1958         int number_screening;
1959         int name_priority;
1960         int name_value;
1961
1962         /* Determine name presentation priority. */
1963         if (!id->name.valid) {
1964                 name_value = AST_PRES_UNAVAILABLE;
1965                 name_priority = 3;
1966         } else {
1967                 name_value = id->name.presentation & AST_PRES_RESTRICTION;
1968                 switch (name_value) {
1969                 case AST_PRES_RESTRICTED:
1970                         name_priority = 0;
1971                         break;
1972                 case AST_PRES_ALLOWED:
1973                         name_priority = 1;
1974                         break;
1975                 case AST_PRES_UNAVAILABLE:
1976                         name_priority = 2;
1977                         break;
1978                 default:
1979                         name_value = AST_PRES_UNAVAILABLE;
1980                         name_priority = 3;
1981                         break;
1982                 }
1983         }
1984
1985         /* Determine number presentation priority. */
1986         if (!id->number.valid) {
1987                 number_screening = AST_PRES_USER_NUMBER_UNSCREENED;
1988                 number_value = AST_PRES_UNAVAILABLE;
1989                 number_priority = 3;
1990         } else {
1991                 number_screening = id->number.presentation & AST_PRES_NUMBER_TYPE;
1992                 number_value = id->number.presentation & AST_PRES_RESTRICTION;
1993                 switch (number_value) {
1994                 case AST_PRES_RESTRICTED:
1995                         number_priority = 0;
1996                         break;
1997                 case AST_PRES_ALLOWED:
1998                         number_priority = 1;
1999                         break;
2000                 case AST_PRES_UNAVAILABLE:
2001                         number_priority = 2;
2002                         break;
2003                 default:
2004                         number_screening = AST_PRES_USER_NUMBER_UNSCREENED;
2005                         number_value = AST_PRES_UNAVAILABLE;
2006                         number_priority = 3;
2007                         break;
2008                 }
2009         }
2010
2011         /* Select the wining presentation value. */
2012         if (name_priority < number_priority) {
2013                 number_value = name_value;
2014         }
2015
2016         return number_value | number_screening;
2017 }
2018
2019 void ast_party_dialed_init(struct ast_party_dialed *init)
2020 {
2021         init->number.str = NULL;
2022         init->number.plan = 0;/* Unknown */
2023         ast_party_subaddress_init(&init->subaddress);
2024         init->transit_network_select = 0;
2025 }
2026
2027 void ast_party_dialed_copy(struct ast_party_dialed *dest, const struct ast_party_dialed *src)
2028 {
2029         if (dest == src) {
2030                 /* Don't copy to self */
2031                 return;
2032         }
2033
2034         ast_free(dest->number.str);
2035         dest->number.str = ast_strdup(src->number.str);
2036         dest->number.plan = src->number.plan;
2037         ast_party_subaddress_copy(&dest->subaddress, &src->subaddress);
2038         dest->transit_network_select = src->transit_network_select;
2039 }
2040
2041 void ast_party_dialed_set_init(struct ast_party_dialed *init, const struct ast_party_dialed *guide)
2042 {
2043         init->number.str = NULL;
2044         init->number.plan = guide->number.plan;
2045         ast_party_subaddress_set_init(&init->subaddress, &guide->subaddress);
2046         init->transit_network_select = guide->transit_network_select;
2047 }
2048
2049 void ast_party_dialed_set(struct ast_party_dialed *dest, const struct ast_party_dialed *src)
2050 {
2051         if (src->number.str && src->number.str != dest->number.str) {
2052                 ast_free(dest->number.str);
2053                 dest->number.str = ast_strdup(src->number.str);
2054         }
2055         dest->number.plan = src->number.plan;
2056
2057         ast_party_subaddress_set(&dest->subaddress, &src->subaddress);
2058
2059         dest->transit_network_select = src->transit_network_select;
2060 }
2061
2062 void ast_party_dialed_free(struct ast_party_dialed *doomed)
2063 {
2064         ast_free(doomed->number.str);
2065         doomed->number.str = NULL;
2066         ast_party_subaddress_free(&doomed->subaddress);
2067 }
2068
2069 void ast_party_caller_init(struct ast_party_caller *init)
2070 {
2071         ast_party_id_init(&init->id);
2072         ast_party_id_init(&init->ani);
2073         init->ani2 = 0;
2074 }
2075
2076 void ast_party_caller_copy(struct ast_party_caller *dest, const struct ast_party_caller *src)
2077 {
2078         if (dest == src) {
2079                 /* Don't copy to self */
2080                 return;
2081         }
2082
2083         ast_party_id_copy(&dest->id, &src->id);
2084         ast_party_id_copy(&dest->ani, &src->ani);
2085         dest->ani2 = src->ani2;
2086 }
2087
2088 void ast_party_caller_set_init(struct ast_party_caller *init, const struct ast_party_caller *guide)
2089 {
2090         ast_party_id_set_init(&init->id, &guide->id);
2091         ast_party_id_set_init(&init->ani, &guide->ani);
2092         init->ani2 = guide->ani2;
2093 }
2094
2095 void ast_party_caller_set(struct ast_party_caller *dest, const struct ast_party_caller *src, const struct ast_set_party_caller *update)
2096 {
2097         ast_party_id_set(&dest->id, &src->id, update ? &update->id : NULL);
2098         ast_party_id_set(&dest->ani, &src->ani, update ? &update->ani : NULL);
2099         dest->ani2 = src->ani2;
2100 }
2101
2102 void ast_party_caller_free(struct ast_party_caller *doomed)
2103 {
2104         ast_party_id_free(&doomed->id);
2105         ast_party_id_free(&doomed->ani);
2106 }
2107
2108 void ast_party_connected_line_init(struct ast_party_connected_line *init)
2109 {
2110         ast_party_id_init(&init->id);
2111         ast_party_id_init(&init->ani);
2112         init->ani2 = 0;
2113         init->source = AST_CONNECTED_LINE_UPDATE_SOURCE_UNKNOWN;
2114 }
2115
2116 void ast_party_connected_line_copy(struct ast_party_connected_line *dest, const struct ast_party_connected_line *src)
2117 {
2118         if (dest == src) {
2119                 /* Don't copy to self */
2120                 return;
2121         }
2122
2123         ast_party_id_copy(&dest->id, &src->id);
2124         ast_party_id_copy(&dest->ani, &src->ani);
2125         dest->ani2 = src->ani2;
2126         dest->source = src->source;
2127 }
2128
2129 void ast_party_connected_line_set_init(struct ast_party_connected_line *init, const struct ast_party_connected_line *guide)
2130 {
2131         ast_party_id_set_init(&init->id, &guide->id);
2132         ast_party_id_set_init(&init->ani, &guide->ani);
2133         init->ani2 = guide->ani2;
2134         init->source = guide->source;
2135 }
2136
2137 void ast_party_connected_line_set(struct ast_party_connected_line *dest, const struct ast_party_connected_line *src, const struct ast_set_party_connected_line *update)
2138 {
2139         ast_party_id_set(&dest->id, &src->id, update ? &update->id : NULL);
2140         ast_party_id_set(&dest->ani, &src->ani, update ? &update->ani : NULL);
2141         dest->ani2 = src->ani2;
2142         dest->source = src->source;
2143 }
2144
2145 void ast_party_connected_line_collect_caller(struct ast_party_connected_line *connected, struct ast_party_caller *caller)
2146 {
2147         connected->id = caller->id;
2148         connected->ani = caller->ani;
2149         connected->ani2 = caller->ani2;
2150         connected->source = AST_CONNECTED_LINE_UPDATE_SOURCE_UNKNOWN;
2151 }
2152
2153 void ast_party_connected_line_free(struct ast_party_connected_line *doomed)
2154 {
2155         ast_party_id_free(&doomed->id);
2156         ast_party_id_free(&doomed->ani);
2157 }
2158
2159 void ast_party_redirecting_init(struct ast_party_redirecting *init)
2160 {
2161         ast_party_id_init(&init->from);
2162         ast_party_id_init(&init->to);
2163         init->count = 0;
2164         init->reason = AST_REDIRECTING_REASON_UNKNOWN;
2165 }
2166
2167 void ast_party_redirecting_copy(struct ast_party_redirecting *dest, const struct ast_party_redirecting *src)
2168 {
2169         if (dest == src) {
2170                 /* Don't copy to self */
2171                 return;
2172         }
2173
2174         ast_party_id_copy(&dest->from, &src->from);
2175         ast_party_id_copy(&dest->to, &src->to);
2176         dest->count = src->count;
2177         dest->reason = src->reason;
2178 }
2179
2180 void ast_party_redirecting_set_init(struct ast_party_redirecting *init, const struct ast_party_redirecting *guide)
2181 {
2182         ast_party_id_set_init(&init->from, &guide->from);
2183         ast_party_id_set_init(&init->to, &guide->to);
2184         init->count = guide->count;
2185         init->reason = guide->reason;
2186 }
2187
2188 void ast_party_redirecting_set(struct ast_party_redirecting *dest, const struct ast_party_redirecting *src, const struct ast_set_party_redirecting *update)
2189 {
2190         ast_party_id_set(&dest->from, &src->from, update ? &update->from : NULL);
2191         ast_party_id_set(&dest->to, &src->to, update ? &update->to : NULL);
2192         dest->reason = src->reason;
2193         dest->count = src->count;
2194 }
2195
2196 void ast_party_redirecting_free(struct ast_party_redirecting *doomed)
2197 {
2198         ast_party_id_free(&doomed->from);
2199         ast_party_id_free(&doomed->to);
2200 }
2201
2202 /*! \brief Free a channel structure */
2203 static void ast_channel_destructor(void *obj)
2204 {
2205         struct ast_channel *chan = obj;
2206         int fd;
2207 #ifdef HAVE_EPOLL
2208         int i;
2209 #endif
2210         struct ast_var_t *vardata;
2211         struct ast_frame *f;
2212         struct varshead *headp;
2213         struct ast_datastore *datastore;
2214         char device_name[AST_CHANNEL_NAME];
2215
2216         if (ast_channel_name(chan)) {
2217                 /* The string fields were initialized. */
2218                 ast_cel_report_event(chan, AST_CEL_CHANNEL_END, NULL, NULL, NULL);
2219                 ast_cel_check_retire_linkedid(chan);
2220         }
2221
2222         /* Get rid of each of the data stores on the channel */
2223         ast_channel_lock(chan);
2224         while ((datastore = AST_LIST_REMOVE_HEAD(&chan->datastores, entry)))
2225                 /* Free the data store */
2226                 ast_datastore_free(datastore);
2227         ast_channel_unlock(chan);
2228
2229         /* Lock and unlock the channel just to be sure nobody has it locked still
2230            due to a reference that was stored in a datastore. (i.e. app_chanspy) */
2231         ast_channel_lock(chan);
2232         ast_channel_unlock(chan);
2233
2234         if (chan->tech_pvt) {
2235                 ast_log(LOG_WARNING, "Channel '%s' may not have been hung up properly\n", ast_channel_name(chan));
2236                 ast_free(chan->tech_pvt);
2237         }
2238
2239         if (chan->sched) {
2240                 ast_sched_context_destroy(chan->sched);
2241         }
2242
2243         if (ast_channel_name(chan)) {
2244                 char *dashptr;
2245
2246                 /* The string fields were initialized. */
2247                 ast_copy_string(device_name, ast_channel_name(chan), sizeof(device_name));
2248                 if ((dashptr = strrchr(device_name, '-'))) {
2249                         *dashptr = '\0';
2250                 }
2251         } else {
2252                 device_name[0] = '\0';
2253         }
2254
2255         /* Stop monitoring */
2256         if (chan->monitor)
2257                 chan->monitor->stop( chan, 0 );
2258
2259         /* If there is native format music-on-hold state, free it */
2260         if (chan->music_state)
2261                 ast_moh_cleanup(chan);
2262
2263         /* Free translators */
2264         if (chan->readtrans)
2265                 ast_translator_free_path(chan->readtrans);
2266         if (chan->writetrans)
2267                 ast_translator_free_path(chan->writetrans);
2268         if (chan->pbx)
2269                 ast_log(LOG_WARNING, "PBX may not have been terminated properly on '%s'\n", ast_channel_name(chan));
2270
2271         ast_party_dialed_free(&chan->dialed);
2272         ast_party_caller_free(&chan->caller);
2273         ast_party_connected_line_free(&chan->connected);
2274         ast_party_redirecting_free(&chan->redirecting);
2275
2276         /* Close pipes if appropriate */
2277         if ((fd = chan->alertpipe[0]) > -1)
2278                 close(fd);
2279         if ((fd = chan->alertpipe[1]) > -1)
2280                 close(fd);
2281         if (chan->timer) {
2282                 ast_timer_close(chan->timer);
2283         }
2284 #ifdef HAVE_EPOLL
2285         for (i = 0; i < AST_MAX_FDS; i++) {
2286                 if (chan->epfd_data[i])
2287                         free(chan->epfd_data[i]);
2288         }
2289         close(chan->epfd);
2290 #endif
2291         while ((f = AST_LIST_REMOVE_HEAD(&chan->readq, frame_list)))
2292                 ast_frfree(f);
2293         
2294         /* loop over the variables list, freeing all data and deleting list items */
2295         /* no need to lock the list, as the channel is already locked */
2296         headp = &chan->varshead;
2297         while ((vardata = AST_LIST_REMOVE_HEAD(headp, entries)))
2298                 ast_var_delete(vardata);
2299
2300         ast_app_group_discard(chan);
2301
2302         /* Destroy the jitterbuffer */
2303         ast_jb_destroy(chan);
2304
2305         if (chan->cdr) {
2306                 ast_cdr_discard(chan->cdr);
2307                 chan->cdr = NULL;
2308         }
2309
2310         if (chan->zone) {
2311                 chan->zone = ast_tone_zone_unref(chan->zone);
2312         }
2313
2314         ast_string_field_free_memory(chan);
2315
2316         if (device_name[0]) {
2317                 /*
2318                  * We have a device name to notify of a new state.
2319                  *
2320                  * Queue an unknown state, because, while we know that this particular
2321                  * instance is dead, we don't know the state of all other possible
2322                  * instances.
2323                  */
2324                 ast_devstate_changed_literal(AST_DEVICE_UNKNOWN, device_name);
2325         }
2326
2327         chan->nativeformats = ast_format_cap_destroy(chan->nativeformats);
2328 }
2329
2330 /*! \brief Free a dummy channel structure */
2331 static void ast_dummy_channel_destructor(void *obj)
2332 {
2333         struct ast_channel *chan = obj;
2334         struct ast_var_t *vardata;
2335         struct varshead *headp;
2336
2337         headp = &chan->varshead;
2338
2339         ast_party_dialed_free(&chan->dialed);
2340         ast_party_caller_free(&chan->caller);
2341         ast_party_connected_line_free(&chan->connected);
2342         ast_party_redirecting_free(&chan->redirecting);
2343
2344         /* loop over the variables list, freeing all data and deleting list items */
2345         /* no need to lock the list, as the channel is already locked */
2346         while ((vardata = AST_LIST_REMOVE_HEAD(headp, entries)))
2347                 ast_var_delete(vardata);
2348
2349         if (chan->cdr) {
2350                 ast_cdr_discard(chan->cdr);
2351                 chan->cdr = NULL;
2352         }
2353
2354         ast_string_field_free_memory(chan);
2355 }
2356
2357 struct ast_datastore *ast_channel_datastore_alloc(const struct ast_datastore_info *info, const char *uid)
2358 {
2359         return ast_datastore_alloc(info, uid);
2360 }
2361
2362 int ast_channel_datastore_free(struct ast_datastore *datastore)
2363 {
2364         return ast_datastore_free(datastore);
2365 }
2366
2367 int ast_channel_datastore_inherit(struct ast_channel *from, struct ast_channel *to)
2368 {
2369         struct ast_datastore *datastore = NULL, *datastore2;
2370
2371         AST_LIST_TRAVERSE(&from->datastores, datastore, entry) {
2372                 if (datastore->inheritance > 0) {
2373                         datastore2 = ast_datastore_alloc(datastore->info, datastore->uid);
2374                         if (datastore2) {
2375                                 datastore2->data = datastore->info->duplicate ? datastore->info->duplicate(datastore->data) : NULL;
2376                                 datastore2->inheritance = datastore->inheritance == DATASTORE_INHERIT_FOREVER ? DATASTORE_INHERIT_FOREVER : datastore->inheritance - 1;
2377                                 AST_LIST_INSERT_TAIL(&to->datastores, datastore2, entry);
2378                         }
2379                 }
2380         }
2381         return 0;
2382 }
2383
2384 int ast_channel_datastore_add(struct ast_channel *chan, struct ast_datastore *datastore)
2385 {
2386         int res = 0;
2387
2388         AST_LIST_INSERT_HEAD(&chan->datastores, datastore, entry);
2389
2390         return res;
2391 }
2392
2393 int ast_channel_datastore_remove(struct ast_channel *chan, struct ast_datastore *datastore)
2394 {
2395         return AST_LIST_REMOVE(&chan->datastores, datastore, entry) ? 0 : -1;
2396 }
2397
2398 struct ast_datastore *ast_channel_datastore_find(struct ast_channel *chan, const struct ast_datastore_info *info, const char *uid)
2399 {
2400         struct ast_datastore *datastore = NULL;
2401         
2402         if (info == NULL)
2403                 return NULL;
2404
2405         AST_LIST_TRAVERSE(&chan->datastores, datastore, entry) {
2406                 if (datastore->info != info) {
2407                         continue;
2408                 }
2409
2410                 if (uid == NULL) {
2411                         /* matched by type only */
2412                         break;
2413                 }
2414
2415                 if ((datastore->uid != NULL) && !strcasecmp(uid, datastore->uid)) {
2416                         /* Matched by type AND uid */
2417                         break;
2418                 }
2419         }
2420
2421         return datastore;
2422 }
2423
2424 /*! Set the file descriptor on the channel */
2425 void ast_channel_set_fd(struct ast_channel *chan, int which, int fd)
2426 {
2427 #ifdef HAVE_EPOLL
2428         struct epoll_event ev;
2429         struct ast_epoll_data *aed = NULL;
2430
2431         if (chan->fds[which] > -1) {
2432                 epoll_ctl(chan->epfd, EPOLL_CTL_DEL, chan->fds[which], &ev);
2433                 aed = chan->epfd_data[which];
2434         }
2435
2436         /* If this new fd is valid, add it to the epoll */
2437         if (fd > -1) {
2438                 if (!aed && (!(aed = ast_calloc(1, sizeof(*aed)))))
2439                         return;
2440                 
2441                 chan->epfd_data[which] = aed;
2442                 aed->chan = chan;
2443                 aed->which = which;
2444                 
2445                 ev.events = EPOLLIN | EPOLLPRI | EPOLLERR | EPOLLHUP;
2446                 ev.data.ptr = aed;
2447                 epoll_ctl(chan->epfd, EPOLL_CTL_ADD, fd, &ev);
2448         } else if (aed) {
2449                 /* We don't have to keep around this epoll data structure now */
2450                 free(aed);
2451                 chan->epfd_data[which] = NULL;
2452         }
2453 #endif
2454         chan->fds[which] = fd;
2455         return;
2456 }
2457
2458 /*! Add a channel to an optimized waitfor */
2459 void ast_poll_channel_add(struct ast_channel *chan0, struct ast_channel *chan1)
2460 {
2461 #ifdef HAVE_EPOLL
2462         struct epoll_event ev;
2463         int i = 0;
2464
2465         if (chan0->epfd == -1)
2466                 return;
2467
2468         /* Iterate through the file descriptors on chan1, adding them to chan0 */
2469         for (i = 0; i < AST_MAX_FDS; i++) {
2470                 if (chan1->fds[i] == -1)
2471                         continue;
2472                 ev.events = EPOLLIN | EPOLLPRI | EPOLLERR | EPOLLHUP;
2473                 ev.data.ptr = chan1->epfd_data[i];
2474                 epoll_ctl(chan0->epfd, EPOLL_CTL_ADD, chan1->fds[i], &ev);
2475         }
2476
2477 #endif
2478         return;
2479 }
2480
2481 /*! Delete a channel from an optimized waitfor */
2482 void ast_poll_channel_del(struct ast_channel *chan0, struct ast_channel *chan1)
2483 {
2484 #ifdef HAVE_EPOLL
2485         struct epoll_event ev;
2486         int i = 0;
2487
2488         if (chan0->epfd == -1)
2489                 return;
2490
2491         for (i = 0; i < AST_MAX_FDS; i++) {
2492                 if (chan1->fds[i] == -1)
2493                         continue;
2494                 epoll_ctl(chan0->epfd, EPOLL_CTL_DEL, chan1->fds[i], &ev);
2495         }
2496
2497 #endif
2498         return;
2499 }
2500
2501 void ast_channel_clear_softhangup(struct ast_channel *chan, int flag)
2502 {
2503         ast_channel_lock(chan);
2504
2505         chan->_softhangup &= ~flag;
2506
2507         if (!chan->_softhangup) {
2508                 struct ast_frame *fr;
2509
2510                 /* If we have completely cleared the softhangup flag,
2511                  * then we need to fully abort the hangup process.  This requires
2512                  * pulling the END_OF_Q frame out of the channel frame queue if it
2513                  * still happens to be there. */
2514
2515                 fr = AST_LIST_LAST(&chan->readq);
2516                 if (fr && fr->frametype == AST_FRAME_CONTROL &&
2517                                 fr->subclass.integer == AST_CONTROL_END_OF_Q) {
2518                         AST_LIST_REMOVE(&chan->readq, fr, frame_list);
2519                         ast_frfree(fr);
2520                 }
2521         }
2522
2523         ast_channel_unlock(chan);
2524 }
2525
2526 /*! \brief Softly hangup a channel, don't lock */
2527 int ast_softhangup_nolock(struct ast_channel *chan, int cause)
2528 {
2529         ast_debug(1, "Soft-Hanging up channel '%s'\n", ast_channel_name(chan));
2530         /* Inform channel driver that we need to be hung up, if it cares */
2531         chan->_softhangup |= cause;
2532         ast_queue_frame(chan, &ast_null_frame);
2533         /* Interrupt any poll call or such */
2534         if (ast_test_flag(chan, AST_FLAG_BLOCKING))
2535                 pthread_kill(chan->blocker, SIGURG);
2536         return 0;
2537 }
2538
2539 /*! \brief Softly hangup a channel, lock */
2540 int ast_softhangup(struct ast_channel *chan, int cause)
2541 {
2542         int res;
2543
2544         ast_channel_lock(chan);
2545         res = ast_softhangup_nolock(chan, cause);
2546         manager_event(EVENT_FLAG_CALL, "SoftHangupRequest",
2547                 "Channel: %s\r\n"
2548                 "Uniqueid: %s\r\n"
2549                 "Cause: %d\r\n",
2550                 ast_channel_name(chan),
2551                 chan->uniqueid,
2552                 cause);
2553         ast_channel_unlock(chan);
2554
2555         return res;
2556 }
2557
2558 static void free_translation(struct ast_channel *clonechan)
2559 {
2560         if (clonechan->writetrans)
2561                 ast_translator_free_path(clonechan->writetrans);
2562         if (clonechan->readtrans)
2563                 ast_translator_free_path(clonechan->readtrans);
2564         clonechan->writetrans = NULL;
2565         clonechan->readtrans = NULL;
2566         if (ast_format_cap_is_empty(clonechan->nativeformats)) {
2567                 ast_format_clear(&clonechan->rawwriteformat);
2568                 ast_format_clear(&clonechan->rawreadformat);
2569         } else {
2570                 struct ast_format tmpfmt;
2571                 ast_best_codec(clonechan->nativeformats, &tmpfmt);
2572                 ast_format_copy(&clonechan->rawwriteformat, &tmpfmt);
2573                 ast_format_copy(&clonechan->rawreadformat, &tmpfmt);
2574         }
2575 }
2576
2577 void ast_set_hangupsource(struct ast_channel *chan, const char *source, int force)
2578 {
2579         struct ast_channel *bridge;
2580
2581         ast_channel_lock(chan);
2582         if (force || ast_strlen_zero(chan->hangupsource)) {
2583                 ast_string_field_set(chan, hangupsource, source);
2584         }
2585         bridge = ast_bridged_channel(chan);
2586         ast_channel_unlock(chan);
2587
2588         if (bridge && (force || ast_strlen_zero(bridge->hangupsource))) {
2589                 ast_channel_lock(bridge);
2590                 ast_string_field_set(chan, hangupsource, source);
2591                 ast_channel_unlock(bridge);
2592         }
2593 }
2594
2595 /*! \brief Hangup a channel */
2596 int ast_hangup(struct ast_channel *chan)
2597 {
2598         char extra_str[64]; /* used for cel logging below */
2599
2600         ast_autoservice_stop(chan);
2601
2602         ao2_lock(channels);
2603         ast_channel_lock(chan);
2604
2605         if (chan->audiohooks) {
2606                 ast_audiohook_detach_list(chan->audiohooks);
2607                 chan->audiohooks = NULL;
2608         }
2609         ast_framehook_list_destroy(chan);
2610
2611         /*
2612          * Do the masquerade if someone is setup to masquerade into us.
2613          *
2614          * NOTE: We must hold the channel lock after testing for a
2615          * pending masquerade and setting the channel as a zombie to
2616          * prevent __ast_channel_masquerade() from setting up a
2617          * masquerade with a dead channel.
2618          */
2619         while (chan->masq) {
2620                 ast_channel_unlock(chan);
2621                 ao2_unlock(channels);
2622                 if (ast_do_masquerade(chan)) {
2623                         ast_log(LOG_WARNING, "Failed to perform masquerade\n");
2624
2625                         /* Abort the loop or we might never leave. */
2626                         ao2_lock(channels);
2627                         ast_channel_lock(chan);
2628                         break;
2629                 }
2630                 ao2_lock(channels);
2631                 ast_channel_lock(chan);
2632         }
2633
2634         if (chan->masqr) {
2635                 /*
2636                  * This channel is one which will be masqueraded into something.
2637                  * Mark it as a zombie already so ast_do_masquerade() will know
2638                  * to free it later.
2639                  */
2640                 ast_set_flag(chan, AST_FLAG_ZOMBIE);
2641                 ast_channel_unlock(chan);
2642                 ao2_unlock(channels);
2643                 return 0;
2644         }
2645
2646         ao2_unlink(channels, chan);
2647         ao2_unlock(channels);
2648
2649         free_translation(chan);
2650         /* Close audio stream */
2651         if (chan->stream) {
2652                 ast_closestream(chan->stream);
2653                 chan->stream = NULL;
2654         }
2655         /* Close video stream */
2656         if (chan->vstream) {
2657                 ast_closestream(chan->vstream);
2658                 chan->vstream = NULL;
2659         }
2660         if (chan->sched) {
2661                 ast_sched_context_destroy(chan->sched);
2662                 chan->sched = NULL;
2663         }
2664
2665         if (chan->generatordata) {      /* Clear any tone stuff remaining */
2666                 if (chan->generator && chan->generator->release) {
2667                         chan->generator->release(chan, chan->generatordata);
2668                 }
2669         }
2670         chan->generatordata = NULL;
2671         chan->generator = NULL;
2672
2673         snprintf(extra_str, sizeof(extra_str), "%d,%s,%s", chan->hangupcause, chan->hangupsource, S_OR(pbx_builtin_getvar_helper(chan, "DIALSTATUS"), ""));
2674         ast_cel_report_event(chan, AST_CEL_HANGUP, NULL, extra_str, NULL);
2675
2676         if (ast_test_flag(chan, AST_FLAG_BLOCKING)) {
2677                 ast_log(LOG_WARNING, "Hard hangup called by thread %ld on %s, while fd "
2678                         "is blocked by thread %ld in procedure %s!  Expect a failure\n",
2679                         (long) pthread_self(), ast_channel_name(chan), (long)chan->blocker, chan->blockproc);
2680                 ast_assert(ast_test_flag(chan, AST_FLAG_BLOCKING) == 0);
2681         }
2682         if (!ast_test_flag(chan, AST_FLAG_ZOMBIE)) {
2683                 ast_debug(1, "Hanging up channel '%s'\n", ast_channel_name(chan));
2684
2685                 /*
2686                  * This channel is now dead so mark it as a zombie so anyone
2687                  * left holding a reference to this channel will not use it.
2688                  */
2689                 ast_set_flag(chan, AST_FLAG_ZOMBIE);
2690                 if (chan->tech->hangup) {
2691                         chan->tech->hangup(chan);
2692                 }
2693         } else {
2694                 ast_debug(1, "Hanging up zombie '%s'\n", ast_channel_name(chan));
2695         }
2696
2697         ast_channel_unlock(chan);
2698
2699         ast_cc_offer(chan);
2700         ast_manager_event(chan, EVENT_FLAG_CALL, "Hangup",
2701                 "Channel: %s\r\n"
2702                 "Uniqueid: %s\r\n"
2703                 "CallerIDNum: %s\r\n"
2704                 "CallerIDName: %s\r\n"
2705                 "ConnectedLineNum: %s\r\n"
2706                 "ConnectedLineName: %s\r\n"
2707                 "Cause: %d\r\n"
2708                 "Cause-txt: %s\r\n",
2709                 ast_channel_name(chan),
2710                 chan->uniqueid,
2711                 S_COR(chan->caller.id.number.valid, chan->caller.id.number.str, "<unknown>"),
2712                 S_COR(chan->caller.id.name.valid, chan->caller.id.name.str, "<unknown>"),
2713                 S_COR(chan->connected.id.number.valid, chan->connected.id.number.str, "<unknown>"),
2714                 S_COR(chan->connected.id.name.valid, chan->connected.id.name.str, "<unknown>"),
2715                 chan->hangupcause,
2716                 ast_cause2str(chan->hangupcause)
2717                 );
2718
2719         if (chan->cdr && !ast_test_flag(chan->cdr, AST_CDR_FLAG_BRIDGED) &&
2720                 !ast_test_flag(chan->cdr, AST_CDR_FLAG_POST_DISABLED) &&
2721                 (chan->cdr->disposition != AST_CDR_NULL || ast_test_flag(chan->cdr, AST_CDR_FLAG_DIALED))) {
2722                 ast_channel_lock(chan);
2723                 ast_cdr_end(chan->cdr);
2724                 ast_cdr_detach(chan->cdr);
2725                 chan->cdr = NULL;
2726                 ast_channel_unlock(chan);
2727         }
2728
2729         ast_channel_unref(chan);
2730
2731         return 0;
2732 }
2733
2734 int ast_raw_answer(struct ast_channel *chan, int cdr_answer)
2735 {
2736         int res = 0;
2737
2738         ast_channel_lock(chan);
2739
2740         /* You can't answer an outbound call */
2741         if (ast_test_flag(chan, AST_FLAG_OUTGOING)) {
2742                 ast_channel_unlock(chan);
2743                 return 0;
2744         }
2745
2746         /* Stop if we're a zombie or need a soft hangup */
2747         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
2748                 ast_channel_unlock(chan);
2749                 return -1;
2750         }
2751
2752         ast_channel_unlock(chan);
2753
2754         switch (chan->_state) {
2755         case AST_STATE_RINGING:
2756         case AST_STATE_RING:
2757                 ast_channel_lock(chan);
2758                 if (chan->tech->answer) {
2759                         res = chan->tech->answer(chan);
2760                 }
2761                 ast_setstate(chan, AST_STATE_UP);
2762                 if (cdr_answer) {
2763                         ast_cdr_answer(chan->cdr);
2764                 }
2765                 ast_cel_report_event(chan, AST_CEL_ANSWER, NULL, NULL, NULL);
2766                 ast_channel_unlock(chan);
2767                 break;
2768         case AST_STATE_UP:
2769                 ast_cel_report_event(chan, AST_CEL_ANSWER, NULL, NULL, NULL);
2770                 /* Calling ast_cdr_answer when it it has previously been called
2771                  * is essentially a no-op, so it is safe.
2772                  */
2773                 if (cdr_answer) {
2774                         ast_cdr_answer(chan->cdr);
2775                 }
2776                 break;
2777         default:
2778                 break;
2779         }
2780
2781         ast_indicate(chan, -1);
2782
2783         return res;
2784 }
2785
2786 int __ast_answer(struct ast_channel *chan, unsigned int delay, int cdr_answer)
2787 {
2788         int res = 0;
2789         enum ast_channel_state old_state;
2790
2791         old_state = chan->_state;
2792         if ((res = ast_raw_answer(chan, cdr_answer))) {
2793                 return res;
2794         }
2795
2796         switch (old_state) {
2797         case AST_STATE_RINGING:
2798         case AST_STATE_RING:
2799                 /* wait for media to start flowing, but don't wait any longer
2800                  * than 'delay' or 500 milliseconds, whichever is longer
2801                  */
2802                 do {
2803                         AST_LIST_HEAD_NOLOCK(, ast_frame) frames;
2804                         struct ast_frame *cur, *new;
2805                         int ms = MAX(delay, 500);
2806                         unsigned int done = 0;
2807
2808                         AST_LIST_HEAD_INIT_NOLOCK(&frames);
2809
2810                         for (;;) {
2811                                 ms = ast_waitfor(chan, ms);
2812                                 if (ms < 0) {
2813                                         ast_log(LOG_WARNING, "Error condition occurred when polling channel %s for a voice frame: %s\n", ast_channel_name(chan), strerror(errno));
2814                                         res = -1;
2815                                         break;
2816                                 }
2817                                 if (ms == 0) {
2818                                         ast_debug(2, "Didn't receive a media frame from %s within %d ms of answering. Continuing anyway\n", ast_channel_name(chan), MAX(delay, 500));
2819                                         break;
2820                                 }
2821                                 cur = ast_read(chan);
2822                                 if (!cur || ((cur->frametype == AST_FRAME_CONTROL) &&
2823                                              (cur->subclass.integer == AST_CONTROL_HANGUP))) {
2824                                         if (cur) {
2825                                                 ast_frfree(cur);
2826                                         }
2827                                         res = -1;
2828                                         ast_debug(2, "Hangup of channel %s detected in answer routine\n", ast_channel_name(chan));
2829                                         break;
2830                                 }
2831
2832                                 if ((new = ast_frisolate(cur)) != cur) {
2833                                         ast_frfree(cur);
2834                                 }
2835
2836                                 AST_LIST_INSERT_HEAD(&frames, new, frame_list);
2837
2838                                 /* if a specific delay period was requested, continue
2839                                  * until that delay has passed. don't stop just because
2840                                  * incoming media has arrived.
2841                                  */
2842                                 if (delay) {
2843                                         continue;
2844                                 }
2845
2846                                 switch (new->frametype) {
2847                                         /* all of these frametypes qualify as 'media' */
2848                                 case AST_FRAME_VOICE:
2849                                 case AST_FRAME_VIDEO:
2850                                 case AST_FRAME_TEXT:
2851                                 case AST_FRAME_DTMF_BEGIN:
2852                                 case AST_FRAME_DTMF_END:
2853                                 case AST_FRAME_IMAGE:
2854                                 case AST_FRAME_HTML:
2855                                 case AST_FRAME_MODEM:
2856                                         done = 1;
2857                                         break;
2858                                 case AST_FRAME_CONTROL:
2859                                 case AST_FRAME_IAX:
2860                                 case AST_FRAME_NULL:
2861                                 case AST_FRAME_CNG:
2862                                         break;
2863                                 }
2864
2865                                 if (done) {
2866                                         break;
2867                                 }
2868                         }
2869
2870                         if (res == 0) {
2871                                 ast_channel_lock(chan);
2872                                 while ((cur = AST_LIST_REMOVE_HEAD(&frames, frame_list))) {
2873                                         ast_queue_frame_head(chan, cur);
2874                                         ast_frfree(cur);
2875                                 }
2876                                 ast_channel_unlock(chan);
2877                         }
2878                 } while (0);
2879                 break;
2880         default:
2881                 break;
2882         }
2883
2884         return res;
2885 }
2886
2887 int ast_answer(struct ast_channel *chan)
2888 {
2889         return __ast_answer(chan, 0, 1);
2890 }
2891
2892 void ast_deactivate_generator(struct ast_channel *chan)
2893 {
2894         ast_channel_lock(chan);
2895         if (chan->generatordata) {
2896                 if (chan->generator && chan->generator->release)
2897                         chan->generator->release(chan, chan->generatordata);
2898                 chan->generatordata = NULL;
2899                 chan->generator = NULL;
2900                 ast_channel_set_fd(chan, AST_GENERATOR_FD, -1);
2901                 ast_clear_flag(chan, AST_FLAG_WRITE_INT);
2902                 ast_settimeout(chan, 0, NULL, NULL);
2903         }
2904         ast_channel_unlock(chan);
2905 }
2906
2907 static void generator_write_format_change(struct ast_channel *chan)
2908 {
2909         ast_channel_lock(chan);
2910         if (chan->generator && chan->generator->write_format_change) {
2911                 chan->generator->write_format_change(chan, chan->generatordata);
2912         }
2913         ast_channel_unlock(chan);
2914 }
2915
2916 static int generator_force(const void *data)
2917 {
2918         /* Called if generator doesn't have data */
2919         void *tmp;
2920         int res;
2921         int (*generate)(struct ast_channel *chan, void *tmp, int datalen, int samples) = NULL;
2922         struct ast_channel *chan = (struct ast_channel *)data;
2923
2924         ast_channel_lock(chan);
2925         tmp = chan->generatordata;
2926         chan->generatordata = NULL;
2927         if (chan->generator)
2928                 generate = chan->generator->generate;
2929         ast_channel_unlock(chan);
2930
2931         if (!tmp || !generate)
2932                 return 0;
2933
2934         res = generate(chan, tmp, 0, ast_format_rate(&chan->writeformat) / 50);
2935
2936         chan->generatordata = tmp;
2937
2938         if (res) {
2939                 ast_debug(1, "Auto-deactivating generator\n");
2940                 ast_deactivate_generator(chan);
2941         }
2942
2943         return 0;
2944 }
2945
2946 int ast_activate_generator(struct ast_channel *chan, struct ast_generator *gen, void *params)
2947 {
2948         int res = 0;
2949
2950         ast_channel_lock(chan);
2951         if (chan->generatordata) {
2952                 if (chan->generator && chan->generator->release)
2953                         chan->generator->release(chan, chan->generatordata);
2954                 chan->generatordata = NULL;
2955         }
2956         if (gen->alloc && !(chan->generatordata = gen->alloc(chan, params))) {
2957                 res = -1;
2958         }
2959         if (!res) {
2960                 ast_settimeout(chan, 50, generator_force, chan);
2961                 chan->generator = gen;
2962         }
2963         ast_channel_unlock(chan);
2964
2965         ast_prod(chan);
2966
2967         return res;
2968 }
2969
2970 /*! \brief Wait for x amount of time on a file descriptor to have input.  */
2971 int ast_waitfor_n_fd(int *fds, int n, int *ms, int *exception)
2972 {
2973         int winner = -1;
2974         ast_waitfor_nandfds(NULL, 0, fds, n, exception, &winner, ms);
2975         return winner;
2976 }
2977
2978 /*! \brief Wait for x amount of time on a file descriptor to have input.  */
2979 #ifdef HAVE_EPOLL
2980 static struct ast_channel *ast_waitfor_nandfds_classic(struct ast_channel **c, int n, int *fds, int nfds,
2981                                         int *exception, int *outfd, int *ms)
2982 #else
2983 struct ast_channel *ast_waitfor_nandfds(struct ast_channel **c, int n, int *fds, int nfds,
2984                                         int *exception, int *outfd, int *ms)
2985 #endif
2986 {
2987         struct timeval start = { 0 , 0 };
2988         struct pollfd *pfds = NULL;
2989         int res;
2990         long rms;
2991         int x, y, max;
2992         int sz;
2993         struct timeval now = { 0, 0 };
2994         struct timeval whentohangup = { 0, 0 }, diff;
2995         struct ast_channel *winner = NULL;
2996         struct fdmap {
2997                 int chan;
2998                 int fdno;
2999         } *fdmap = NULL;
3000
3001         if ((sz = n * AST_MAX_FDS + nfds)) {
3002                 pfds = alloca(sizeof(*pfds) * sz);
3003                 fdmap = alloca(sizeof(*fdmap) * sz);
3004         }
3005
3006         if (outfd)
3007                 *outfd = -99999;
3008         if (exception)
3009                 *exception = 0;
3010         
3011         /* Perform any pending masquerades */
3012         for (x = 0; x < n; x++) {
3013                 if (c[x]->masq && ast_do_masquerade(c[x])) {
3014                         ast_log(LOG_WARNING, "Masquerade failed\n");
3015                         *ms = -1;
3016                         return NULL;
3017                 }
3018
3019                 ast_channel_lock(c[x]);
3020                 if (!ast_tvzero(c[x]->whentohangup)) {
3021                         if (ast_tvzero(whentohangup))
3022                                 now = ast_tvnow();
3023                         diff = ast_tvsub(c[x]->whentohangup, now);
3024                         if (diff.tv_sec < 0 || ast_tvzero(diff)) {
3025                                 /* Should already be hungup */
3026                                 c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
3027                                 ast_channel_unlock(c[x]);
3028                                 return c[x];
3029                         }
3030                         if (ast_tvzero(whentohangup) || ast_tvcmp(diff, whentohangup) < 0)
3031                                 whentohangup = diff;
3032                 }
3033                 ast_channel_unlock(c[x]);
3034         }
3035         /* Wait full interval */
3036         rms = *ms;
3037         /* INT_MAX, not LONG_MAX, because it matters on 64-bit */
3038         if (!ast_tvzero(whentohangup) && whentohangup.tv_sec < INT_MAX / 1000) {
3039                 rms = whentohangup.tv_sec * 1000 + whentohangup.tv_usec / 1000;              /* timeout in milliseconds */
3040                 if (*ms >= 0 && *ms < rms) {                                                 /* original *ms still smaller */
3041                         rms =  *ms;
3042                 }
3043         } else if (!ast_tvzero(whentohangup) && rms < 0) {
3044                 /* Tiny corner case... call would need to last >24 days */
3045                 rms = INT_MAX;
3046         }
3047         /*
3048          * Build the pollfd array, putting the channels' fds first,
3049          * followed by individual fds. Order is important because
3050          * individual fd's must have priority over channel fds.
3051          */
3052         max = 0;
3053         for (x = 0; x < n; x++) {
3054                 for (y = 0; y < AST_MAX_FDS; y++) {
3055                         fdmap[max].fdno = y;  /* fd y is linked to this pfds */
3056                         fdmap[max].chan = x;  /* channel x is linked to this pfds */
3057                         max += ast_add_fd(&pfds[max], c[x]->fds[y]);
3058                 }
3059                 CHECK_BLOCKING(c[x]);
3060         }
3061         /* Add the individual fds */
3062         for (x = 0; x < nfds; x++) {
3063                 fdmap[max].chan = -1;
3064                 max += ast_add_fd(&pfds[max], fds[x]);
3065         }
3066
3067         if (*ms > 0)
3068                 start = ast_tvnow();
3069         
3070         if (sizeof(int) == 4) { /* XXX fix timeout > 600000 on linux x86-32 */
3071                 do {
3072                         int kbrms = rms;
3073                         if (kbrms > 600000)
3074                                 kbrms = 600000;
3075                         res = ast_poll(pfds, max, kbrms);
3076                         if (!res)
3077                                 rms -= kbrms;
3078                 } while (!res && (rms > 0));
3079         } else {
3080                 res = ast_poll(pfds, max, rms);
3081         }
3082         for (x = 0; x < n; x++)
3083                 ast_clear_flag(c[x], AST_FLAG_BLOCKING);
3084         if (res < 0) { /* Simulate a timeout if we were interrupted */
3085                 if (errno != EINTR)
3086                         *ms = -1;
3087                 return NULL;
3088         }
3089         if (!ast_tvzero(whentohangup)) {   /* if we have a timeout, check who expired */
3090                 now = ast_tvnow();
3091                 for (x = 0; x < n; x++) {
3092                         if (!ast_tvzero(c[x]->whentohangup) && ast_tvcmp(c[x]->whentohangup, now) <= 0) {
3093                                 c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
3094                                 if (winner == NULL)
3095                                         winner = c[x];
3096                         }
3097                 }
3098         }
3099         if (res == 0) { /* no fd ready, reset timeout and done */
3100                 *ms = 0;        /* XXX use 0 since we may not have an exact timeout. */
3101                 return winner;
3102         }
3103         /*
3104          * Then check if any channel or fd has a pending event.
3105          * Remember to check channels first and fds last, as they
3106          * must have priority on setting 'winner'
3107          */
3108         for (x = 0; x < max; x++) {
3109                 res = pfds[x].revents;
3110                 if (res == 0)
3111                         continue;
3112                 if (fdmap[x].chan >= 0) {       /* this is a channel */
3113                         winner = c[fdmap[x].chan];      /* override previous winners */
3114                         if (res & POLLPRI)
3115                                 ast_set_flag(winner, AST_FLAG_EXCEPTION);
3116                         else
3117                                 ast_clear_flag(winner, AST_FLAG_EXCEPTION);
3118                         winner->fdno = fdmap[x].fdno;
3119                 } else {                        /* this is an fd */
3120                         if (outfd)
3121                                 *outfd = pfds[x].fd;
3122                         if (exception)
3123                                 *exception = (res & POLLPRI) ? -1 : 0;
3124                         winner = NULL;
3125                 }
3126         }
3127         if (*ms > 0) {
3128                 *ms -= ast_tvdiff_ms(ast_tvnow(), start);
3129                 if (*ms < 0)
3130                         *ms = 0;
3131         }
3132         return winner;
3133 }
3134
3135 #ifdef HAVE_EPOLL
3136 static struct ast_channel *ast_waitfor_nandfds_simple(struct ast_channel *chan, int *ms)
3137 {
3138         struct timeval start = { 0 , 0 };
3139         int res = 0;
3140         struct epoll_event ev[1];
3141         long diff, rms = *ms;
3142         struct ast_channel *winner = NULL;
3143         struct ast_epoll_data *aed = NULL;
3144
3145
3146         /* See if this channel needs to be masqueraded */
3147         if (chan->masq && ast_do_masquerade(chan)) {
3148                 ast_log(LOG_WARNING, "Failed to perform masquerade on %s\n", ast_channel_name(chan));
3149                 *ms = -1;
3150                 return NULL;
3151         }
3152
3153         ast_channel_lock(chan);
3154         /* Figure out their timeout */
3155         if (!ast_tvzero(chan->whentohangup)) {
3156                 if ((diff = ast_tvdiff_ms(chan->whentohangup, ast_tvnow())) < 0) {
3157                         /* They should already be hungup! */
3158                         chan->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
3159                         ast_channel_unlock(chan);
3160                         return NULL;
3161                 }
3162                 /* If this value is smaller then the current one... make it priority */
3163                 if (rms > diff)
3164                         rms = diff;
3165         }
3166
3167         ast_channel_unlock(chan);
3168
3169         /* Time to make this channel block... */
3170         CHECK_BLOCKING(chan);
3171
3172         if (*ms > 0)
3173                 start = ast_tvnow();
3174
3175         /* We don't have to add any file descriptors... they are already added, we just have to wait! */
3176         res = epoll_wait(chan->epfd, ev, 1, rms);
3177
3178         /* Stop blocking */
3179         ast_clear_flag(chan, AST_FLAG_BLOCKING);
3180
3181         /* Simulate a timeout if we were interrupted */
3182         if (res < 0) {
3183                 if (errno != EINTR)
3184                         *ms = -1;
3185                 return NULL;
3186         }
3187
3188         /* If this channel has a timeout see if it expired */
3189         if (!ast_tvzero(chan->whentohangup)) {
3190                 if (ast_tvdiff_ms(ast_tvnow(), chan->whentohangup) >= 0) {
3191                         chan->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
3192                         winner = chan;
3193                 }
3194         }
3195
3196         /* No fd ready, reset timeout and be done for now */
3197         if (!res) {
3198                 *ms = 0;
3199                 return winner;
3200         }
3201
3202         /* See what events are pending */
3203         aed = ev[0].data.ptr;
3204         chan->fdno = aed->which;
3205         if (ev[0].events & EPOLLPRI)
3206                 ast_set_flag(chan, AST_FLAG_EXCEPTION);
3207         else
3208                 ast_clear_flag(chan, AST_FLAG_EXCEPTION);
3209
3210         if (*ms > 0) {
3211                 *ms -= ast_tvdiff_ms(ast_tvnow(), start);
3212                 if (*ms < 0)
3213                         *ms = 0;
3214         }
3215
3216         return chan;
3217 }
3218
3219 static struct ast_channel *ast_waitfor_nandfds_complex(struct ast_channel **c, int n, int *ms)
3220 {
3221         struct timeval start = { 0 , 0 };
3222         int res = 0, i;
3223         struct epoll_event ev[25] = { { 0, } };
3224         struct timeval now = { 0, 0 };
3225         long whentohangup = 0, diff = 0, rms = *ms;
3226         struct ast_channel *winner = NULL;
3227
3228         for (i = 0; i < n; i++) {
3229                 if (c[i]->masq && ast_do_masquerade(c[i])) {
3230                         ast_log(LOG_WARNING, "Masquerade failed\n");
3231                         *ms = -1;
3232                         return NULL;
3233                 }
3234
3235                 ast_channel_lock(c[i]);
3236                 if (!ast_tvzero(c[i]->whentohangup)) {
3237                         if (whentohangup == 0)
3238                                 now = ast_tvnow();
3239                         if ((diff = ast_tvdiff_ms(c[i]->whentohangup, now)) < 0) {
3240                                 c[i]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
3241                                 ast_channel_unlock(c[i]);
3242                                 return c[i];
3243                         }
3244                         if (!whentohangup || whentohangup > diff)
3245                                 whentohangup = diff;
3246                 }
3247                 ast_channel_unlock(c[i]);
3248                 CHECK_BLOCKING(c[i]);
3249         }
3250
3251         rms = *ms;
3252         if (whentohangup) {
3253                 rms = whentohangup;
3254                 if (*ms >= 0 && *ms < rms)
3255                         rms = *ms;
3256         }
3257
3258         if (*ms > 0)
3259                 start = ast_tvnow();
3260
3261         res = epoll_wait(c[0]->epfd, ev, 25, rms);
3262
3263         for (i = 0; i < n; i++)
3264                 ast_clear_flag(c[i], AST_FLAG_BLOCKING);
3265
3266         if (res < 0) {
3267                 if (errno != EINTR)
3268                         *ms = -1;
3269                 return NULL;
3270         }
3271
3272         if (whentohangup) {
3273                 now = ast_tvnow();
3274                 for (i = 0; i < n; i++) {
3275                         if (!ast_tvzero(c[i]->whentohangup) && ast_tvdiff_ms(now, c[i]->whentohangup) >= 0) {
3276                                 c[i]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
3277                                 if (!winner)
3278                                         winner = c[i];
3279                         }
3280                 }
3281         }
3282
3283         if (!res) {
3284                 *ms = 0;
3285                 return winner;
3286         }
3287
3288         for (i = 0; i < res; i++) {
3289                 struct ast_epoll_data *aed = ev[i].data.ptr;
3290
3291                 if (!ev[i].events || !aed)
3292                         continue;
3293
3294                 winner = aed->chan;
3295                 if (ev[i].events & EPOLLPRI)
3296                         ast_set_flag(winner, AST_FLAG_EXCEPTION);
3297                 else
3298                         ast_clear_flag(winner, AST_FLAG_EXCEPTION);
3299                 winner->fdno = aed->which;
3300         }
3301
3302         if (*ms > 0) {
3303                 *ms -= ast_tvdiff_ms(ast_tvnow(), start);
3304                 if (*ms < 0)
3305                         *ms = 0;
3306         }
3307
3308         return winner;
3309 }
3310
3311 struct ast_channel *ast_waitfor_nandfds(struct ast_channel **c, int n, int *fds, int nfds,
3312                                         int *exception, int *outfd, int *ms)
3313 {
3314         /* Clear all provided values in one place. */
3315         if (outfd)
3316                 *outfd = -99999;
3317         if (exception)
3318                 *exception = 0;
3319
3320         /* If no epoll file descriptor is available resort to classic nandfds */
3321         if (!n || nfds || c[0]->epfd == -1)
3322                 return ast_waitfor_nandfds_classic(c, n, fds, nfds, exception, outfd, ms);
3323         else if (!nfds && n == 1)
3324                 return ast_waitfor_nandfds_simple(c[0], ms);
3325         else
3326                 return ast_waitfor_nandfds_complex(c, n, ms);
3327 }
3328 #endif
3329
3330 struct ast_channel *ast_waitfor_n(struct ast_channel **c, int n, int *ms)
3331 {
3332         return ast_waitfor_nandfds(c, n, NULL, 0, NULL, NULL, ms);
3333 }
3334
3335 int ast_waitfor(struct ast_channel *c, int ms)
3336 {
3337         int oldms = ms; /* -1 if no timeout */
3338
3339         ast_waitfor_nandfds(&c, 1, NULL, 0, NULL, NULL, &ms);
3340         if ((ms < 0) && (oldms < 0))
3341                 ms = 0;
3342         return ms;
3343 }
3344
3345 /* XXX never to be called with ms = -1 */
3346 int ast_waitfordigit(struct ast_channel *c, int ms)