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720 lines
18 KiB
720 lines
18 KiB
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Channel Management
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <string.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <errno.h>
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#include <unistd.h>
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#include <asterisk/sched.h>
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#include <asterisk/options.h>
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#include <asterisk/channel.h>
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#include <asterisk/channel_pvt.h>
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#include <asterisk/logger.h>
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#include <asterisk/file.h>
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#include <asterisk/translate.h>
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#ifdef DEBUG_MUTEX
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/* Convenient mutex debugging functions */
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#define PTHREAD_MUTEX_LOCK(a) __PTHREAD_MUTEX_LOCK(__FUNCTION__, a)
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#define PTHREAD_MUTEX_UNLOCK(a) __PTHREAD_MUTEX_UNLOCK(__FUNCTION__, a)
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static int __PTHREAD_MUTEX_LOCK(char *f, pthread_mutex_t *a) {
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ast_log(LOG_DEBUG, "Locking %p (%s)\n", a, f);
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return pthread_mutex_lock(a);
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}
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static int __PTHREAD_MUTEX_UNLOCK(char *f, pthread_mutex_t *a) {
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ast_log(LOG_DEBUG, "Unlocking %p (%s)\n", a, f);
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return pthread_mutex_unlock(a);
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}
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#else
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#define PTHREAD_MUTEX_LOCK(a) pthread_mutex_lock(a)
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#define PTHREAD_MUTEX_UNLOCK(a) pthread_mutex_unlock(a)
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#endif
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struct chanlist {
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char type[80];
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char description[80];
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int capabilities;
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struct ast_channel * (*requester)(char *type, int format, void *data);
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struct chanlist *next;
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} *backends = NULL;
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struct ast_channel *channels = NULL;
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/* Protect the channel list (highly unlikely that two things would change
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it at the same time, but still! */
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static pthread_mutex_t chlock = PTHREAD_MUTEX_INITIALIZER;
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int ast_channel_register(char *type, char *description, int capabilities,
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struct ast_channel *(*requester)(char *type, int format, void *data))
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{
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struct chanlist *chan, *last=NULL;
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if (PTHREAD_MUTEX_LOCK(&chlock)) {
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ast_log(LOG_WARNING, "Unable to lock channel list\n");
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return -1;
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}
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chan = backends;
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while(chan) {
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if (!strcasecmp(type, chan->type)) {
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ast_log(LOG_WARNING, "Already have a handler for type '%s'\n", type);
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PTHREAD_MUTEX_UNLOCK(&chlock);
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return -1;
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}
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last = chan;
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chan = chan->next;
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}
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chan = malloc(sizeof(struct chanlist));
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if (!chan) {
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ast_log(LOG_WARNING, "Out of memory\n");
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PTHREAD_MUTEX_UNLOCK(&chlock);
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return -1;
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}
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strncpy(chan->type, type, sizeof(chan->type));
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strncpy(chan->description, description, sizeof(chan->description));
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chan->capabilities = capabilities;
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chan->requester = requester;
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chan->next = NULL;
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if (last)
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last->next = chan;
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else
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backends = chan;
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if (option_debug)
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ast_log(LOG_DEBUG, "Registered handler for '%s' (%s)\n", chan->type, chan->description);
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else if (option_verbose > 1)
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ast_verbose( VERBOSE_PREFIX_2 "Registered channel type '%s' (%s)\n", chan->type, chan->description);
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PTHREAD_MUTEX_UNLOCK(&chlock);
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return 0;
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}
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struct ast_channel *ast_channel_alloc(void)
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{
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struct ast_channel *tmp;
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struct ast_channel_pvt *pvt;
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PTHREAD_MUTEX_LOCK(&chlock);
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tmp = malloc(sizeof(struct ast_channel));
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memset(tmp, 0, sizeof(struct ast_channel));
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if (tmp) {
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pvt = malloc(sizeof(struct ast_channel_pvt));
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if (pvt) {
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memset(pvt, 0, sizeof(struct ast_channel_pvt));
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tmp->sched = sched_context_create();
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if (tmp->sched) {
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tmp->fd = -1;
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strncpy(tmp->name, "**Unknown**", sizeof(tmp->name));
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tmp->pvt = pvt;
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tmp->state = AST_STATE_DOWN;
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tmp->stack = -1;
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tmp->streamid = -1;
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tmp->appl = NULL;
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tmp->data = NULL;
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pthread_mutex_init(&tmp->lock, NULL);
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strncpy(tmp->context, "default", sizeof(tmp->context));
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strncpy(tmp->language, defaultlanguage, sizeof(tmp->language));
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strncpy(tmp->exten, "s", sizeof(tmp->exten));
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tmp->priority=1;
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tmp->next = channels;
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channels= tmp;
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} else {
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ast_log(LOG_WARNING, "Unable to create schedule context\n");
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free(tmp);
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tmp = NULL;
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}
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} else {
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ast_log(LOG_WARNING, "Out of memory\n");
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free(tmp);
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tmp = NULL;
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}
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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PTHREAD_MUTEX_UNLOCK(&chlock);
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return tmp;
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}
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struct ast_channel *ast_channel_walk(struct ast_channel *prev)
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{
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struct ast_channel *l, *ret=NULL;
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PTHREAD_MUTEX_LOCK(&chlock);
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l = channels;
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if (!prev) {
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PTHREAD_MUTEX_UNLOCK(&chlock);
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return l;
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}
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while(l) {
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if (l == prev)
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ret = l->next;
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l = l->next;
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}
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PTHREAD_MUTEX_UNLOCK(&chlock);
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return ret;
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}
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void ast_channel_free(struct ast_channel *chan)
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{
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struct ast_channel *last=NULL, *cur;
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PTHREAD_MUTEX_LOCK(&chlock);
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cur = channels;
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while(cur) {
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if (cur == chan) {
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if (last)
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last->next = cur->next;
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else
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channels = cur->next;
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break;
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}
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last = cur;
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cur = cur->next;
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}
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if (!cur)
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ast_log(LOG_WARNING, "Unable to find channel in list\n");
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if (chan->pvt->pvt)
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ast_log(LOG_WARNING, "Channel '%s' may not have been hung up properly\n", chan->name);
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/* Free translatosr */
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if (chan->pvt->readtrans)
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ast_translator_free_path(chan->pvt->readtrans);
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if (chan->pvt->writetrans)
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ast_translator_free_path(chan->pvt->writetrans);
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if (chan->pbx)
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ast_log(LOG_WARNING, "PBX may not have been terminated properly on '%s'\n", chan->name);
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if (chan->dnid)
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free(chan->dnid);
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if (chan->callerid)
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free(chan->callerid);
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pthread_mutex_destroy(&chan->lock);
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free(chan->pvt);
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free(chan);
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PTHREAD_MUTEX_UNLOCK(&chlock);
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}
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int ast_softhangup(struct ast_channel *chan)
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{
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int res = 0;
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if (chan->stream)
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ast_stopstream(chan);
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if (option_debug)
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ast_log(LOG_DEBUG, "Soft-Hanging up channel '%s'\n", chan->name);
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if (chan->pvt->hangup)
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res = chan->pvt->hangup(chan);
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if (chan->pvt->pvt)
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ast_log(LOG_WARNING, "Channel '%s' may not have been hung up properly\n", chan->name);
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if (chan->pbx)
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ast_log(LOG_WARNING, "PBX may not have been terminated properly on '%s'\n", chan->name);
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/* Interrupt any select call or such */
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if (chan->blocking)
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pthread_kill(chan->blocker, SIGURG);
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return res;
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}
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int ast_hangup(struct ast_channel *chan)
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{
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int res = 0;
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if (chan->stream)
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ast_stopstream(chan);
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if (chan->sched)
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sched_context_destroy(chan->sched);
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if (chan->blocking) {
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ast_log(LOG_WARNING, "Hard hangup called by thread %ld on %s, while fd "
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"is blocked by thread %ld in procedure %s! Expect a failure\n",
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pthread_self(), chan->name, chan->blocker, chan->blockproc);
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CRASH;
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}
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if (option_debug)
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ast_log(LOG_DEBUG, "Hanging up channel '%s'\n", chan->name);
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if (chan->pvt->hangup)
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res = chan->pvt->hangup(chan);
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ast_channel_free(chan);
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return res;
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}
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void ast_channel_unregister(char *type)
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{
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struct chanlist *chan, *last=NULL;
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if (option_debug)
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ast_log(LOG_DEBUG, "Unregistering channel type '%s'\n", type);
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if (PTHREAD_MUTEX_LOCK(&chlock)) {
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ast_log(LOG_WARNING, "Unable to lock channel list\n");
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return;
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}
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chan = backends;
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while(chan) {
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if (!strcasecmp(chan->type, type)) {
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if (last)
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last->next = chan->next;
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else
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backends = backends->next;
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free(chan);
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PTHREAD_MUTEX_UNLOCK(&chlock);
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return;
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}
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last = chan;
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chan = chan->next;
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}
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PTHREAD_MUTEX_UNLOCK(&chlock);
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}
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int ast_answer(struct ast_channel *chan)
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{
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/* Answer the line, if possible */
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if (chan->state == AST_STATE_RING) {
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if (chan->pvt->answer)
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return chan->pvt->answer(chan);
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}
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return 0;
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}
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int ast_waitfor_n_fd(int *fds, int n, int *ms, int *exception)
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{
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/* Wait for x amount of time on a file descriptor to have input. */
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struct timeval tv;
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fd_set rfds, efds;
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int res;
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int x, max=-1;
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int winner = -1;
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tv.tv_sec = *ms / 1000;
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tv.tv_usec = (*ms % 1000) * 1000;
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FD_ZERO(&rfds);
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FD_ZERO(&efds);
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for (x=0;x<n;x++) {
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FD_SET(fds[x], &rfds);
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FD_SET(fds[x], &efds);
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if (fds[x] > max)
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max = fds[x];
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}
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if (*ms >= 0)
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res = select(max + 1, &rfds, NULL, &efds, &tv);
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else
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res = select(max + 1, &rfds, NULL, &efds, NULL);
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for (x=0;x<n;x++) {
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if ((FD_ISSET(fds[x], &rfds) || FD_ISSET(fds[x], &efds)) && (winner < 0)) {
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if (exception)
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*exception = FD_ISSET(fds[x], &efds);
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winner = fds[x];
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}
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}
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*ms = tv.tv_sec * 1000 + tv.tv_usec / 1000;
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if (res < 0)
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*ms = -10;
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return winner;
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}
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struct ast_channel *ast_waitfor_n(struct ast_channel **c, int n, int *ms)
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{
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/* Wait for x amount of time on a file descriptor to have input. */
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struct timeval tv;
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fd_set rfds, efds;
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int res;
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int x, max=-1;
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struct ast_channel *winner = NULL;
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tv.tv_sec = *ms / 1000;
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tv.tv_usec = (*ms % 1000) * 1000;
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FD_ZERO(&rfds);
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FD_ZERO(&efds);
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for (x=0;x<n;x++) {
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FD_SET(c[x]->fd, &rfds);
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FD_SET(c[x]->fd, &efds);
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CHECK_BLOCKING(c[x]);
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if (c[x]->fd > max)
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max = c[x]->fd;
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}
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if (*ms >= 0)
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res = select(max + 1, &rfds, NULL, &efds, &tv);
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else
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res = select(max + 1, &rfds, NULL, &efds, NULL);
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for (x=0;x<n;x++) {
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c[x]->blocking = 0;
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if ((FD_ISSET(c[x]->fd, &rfds) || FD_ISSET(c[x]->fd, &efds)) && !winner) {
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/* Set exception flag if appropriate */
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if (FD_ISSET(c[x]->fd, &efds))
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c[x]->exception = 1;
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winner = c[x];
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}
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}
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*ms = tv.tv_sec * 1000 + tv.tv_usec / 1000;
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if (res < 0)
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*ms = -10;
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return winner;
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}
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int ast_waitfor(struct ast_channel *c, int ms)
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{
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if (ast_waitfor_n(&c, 1, &ms)) {
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if (ms < 0)
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return -ms;
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return ms;
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}
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/* Error if ms < 0 */
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if (ms < 0)
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return -1;
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return 0;
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}
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char ast_waitfordigit(struct ast_channel *c, int ms)
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{
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struct ast_frame *f;
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char result = 0;
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/* Wait for a digit, no more than ms milliseconds total. */
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while(ms && !result) {
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ms = ast_waitfor(c, ms);
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if (ms < 0) /* Error */
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result = -1;
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else if (ms > 0) {
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/* Read something */
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f = ast_read(c);
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if (f) {
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if (f->frametype == AST_FRAME_DTMF)
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result = f->subclass;
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ast_frfree(f);
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} else
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result = -1;
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}
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}
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return result;
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}
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struct ast_frame *ast_read(struct ast_channel *chan)
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{
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struct ast_frame *f = NULL;
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static struct ast_frame null_frame =
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{
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AST_FRAME_NULL,
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};
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chan->blocker = pthread_self();
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if (chan->exception) {
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if (chan->pvt->exception)
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f = chan->pvt->exception(chan);
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else
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ast_log(LOG_WARNING, "Exception flag set, but no exception handler\n");
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/* Clear the exception flag */
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chan->exception = 0;
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} else
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if (chan->pvt->read)
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f = chan->pvt->read(chan);
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else
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ast_log(LOG_WARNING, "No read routine on channel %s\n", chan);
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if (f && (f->frametype == AST_FRAME_VOICE)) {
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if (chan->pvt->readtrans) {
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f = ast_translate(chan->pvt->readtrans, f, 1);
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if (!f)
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f = &null_frame;
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}
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}
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return f;
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}
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int ast_sendtext(struct ast_channel *chan, char *text)
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{
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int res = 0;
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CHECK_BLOCKING(chan);
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if (chan->pvt->send_text)
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res = chan->pvt->send_text(chan, text);
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chan->blocking = 0;
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return res;
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}
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int ast_write(struct ast_channel *chan, struct ast_frame *fr)
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{
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int res = -1;
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struct ast_frame *f;
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CHECK_BLOCKING(chan);
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switch(fr->frametype) {
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case AST_FRAME_CONTROL:
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/* XXX Interpret control frames XXX */
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ast_log(LOG_WARNING, "Don't know how to handle control frames yet\n");
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break;
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case AST_FRAME_DTMF:
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if (chan->pvt->send_digit)
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res = chan->pvt->send_digit(chan, fr->subclass);
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break;
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default:
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if (chan->pvt->write) {
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if (chan->pvt->writetrans) {
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f = ast_translate(chan->pvt->writetrans, fr, 1);
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} else
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f = fr;
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if (f)
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res = chan->pvt->write(chan, f);
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}
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}
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chan->blocking = 0;
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return res;
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}
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int ast_set_write_format(struct ast_channel *chan, int fmts)
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{
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int fmt;
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int native;
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int res;
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native = chan->nativeformats;
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fmt = fmts;
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res = ast_translator_best_choice(&native, &fmt);
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if (res < 0) {
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ast_log(LOG_NOTICE, "Unable to find a path from %d to %d\n", fmts, chan->nativeformats);
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return -1;
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}
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/* Now we have a good choice for both. We'll write using our native format. */
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chan->pvt->rawwriteformat = native;
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/* User perspective is fmt */
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chan->writeformat = fmt;
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/* Free any write translation we have right now */
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if (chan->pvt->writetrans)
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ast_translator_free_path(chan->pvt->writetrans);
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/* Build a translation path from the user write format to the raw writing format */
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chan->pvt->writetrans = ast_translator_build_path(chan->pvt->rawwriteformat, chan->writeformat);
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ast_log(LOG_DEBUG, "Set channel %s to format %d\n", chan->name, chan->writeformat);
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return 0;
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}
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int ast_set_read_format(struct ast_channel *chan, int fmts)
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{
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int fmt;
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int native;
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int res;
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native = chan->nativeformats;
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fmt = fmts;
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/* Find a translation path from the native read format to one of the user's read formats */
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res = ast_translator_best_choice(&fmt, &native);
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if (res < 0) {
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ast_log(LOG_NOTICE, "Unable to find a path from %d to %d\n", chan->nativeformats, fmts);
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return -1;
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}
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/* Now we have a good choice for both. We'll write using our native format. */
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chan->pvt->rawreadformat = native;
|
|
/* User perspective is fmt */
|
|
chan->readformat = fmt;
|
|
/* Free any read translation we have right now */
|
|
if (chan->pvt->readtrans)
|
|
ast_translator_free_path(chan->pvt->readtrans);
|
|
/* Build a translation path from the raw read format to the user reading format */
|
|
chan->pvt->readtrans = ast_translator_build_path(chan->readformat, chan->pvt->rawreadformat);
|
|
return 0;
|
|
}
|
|
|
|
struct ast_channel *ast_request(char *type, int format, void *data)
|
|
{
|
|
struct chanlist *chan;
|
|
struct ast_channel *c = NULL;
|
|
int capabilities;
|
|
int fmt;
|
|
int res;
|
|
if (PTHREAD_MUTEX_LOCK(&chlock)) {
|
|
ast_log(LOG_WARNING, "Unable to lock channel list\n");
|
|
return NULL;
|
|
}
|
|
chan = backends;
|
|
while(chan) {
|
|
if (!strcasecmp(type, chan->type)) {
|
|
capabilities = chan->capabilities;
|
|
fmt = format;
|
|
res = ast_translator_best_choice(&fmt, &capabilities);
|
|
if (res < 0) {
|
|
ast_log(LOG_WARNING, "No translator path exists for channel type %s (native %d) to %d\n", type, chan->capabilities, format);
|
|
PTHREAD_MUTEX_UNLOCK(&chlock);
|
|
return NULL;
|
|
}
|
|
PTHREAD_MUTEX_UNLOCK(&chlock);
|
|
if (chan->requester)
|
|
c = chan->requester(type, capabilities, data);
|
|
return c;
|
|
}
|
|
chan = chan->next;
|
|
}
|
|
if (!chan)
|
|
ast_log(LOG_WARNING, "No channel type registered for '%s'\n", type);
|
|
PTHREAD_MUTEX_UNLOCK(&chlock);
|
|
return c;
|
|
}
|
|
|
|
int ast_call(struct ast_channel *chan, char *addr, int timeout)
|
|
{
|
|
/* Place an outgoing call, but don't wait any longer than timeout ms before returning.
|
|
If the remote end does not answer within the timeout, then do NOT hang up, but
|
|
return anyway. */
|
|
int res = -1;
|
|
if (chan->pvt->call)
|
|
res = chan->pvt->call(chan, addr, timeout);
|
|
return res;
|
|
}
|
|
|
|
int ast_readstring(struct ast_channel *c, char *s, int len, int timeout, int ftimeout, char *enders)
|
|
{
|
|
int pos=0;
|
|
int to = ftimeout;
|
|
char d;
|
|
if (!len)
|
|
return -1;
|
|
do {
|
|
if (c->streamid > -1) {
|
|
d = ast_waitstream(c, AST_DIGIT_ANY);
|
|
ast_stopstream(c);
|
|
usleep(1000);
|
|
if (!d)
|
|
d = ast_waitfordigit(c, to);
|
|
} else {
|
|
d = ast_waitfordigit(c, to);
|
|
}
|
|
if (d < 0)
|
|
return -1;
|
|
if (!strchr(enders, d))
|
|
s[pos++] = d;
|
|
if ((d == 0) || strchr(enders, d) || (pos >= len - 1)) {
|
|
s[pos]='\0';
|
|
return 0;
|
|
}
|
|
to = timeout;
|
|
} while(1);
|
|
/* Never reached */
|
|
return 0;
|
|
}
|
|
|
|
int ast_channel_make_compatible(struct ast_channel *chan, struct ast_channel *peer)
|
|
{
|
|
int peerf;
|
|
int chanf;
|
|
int res;
|
|
peerf = peer->nativeformats;
|
|
chanf = chan->nativeformats;
|
|
res = ast_translator_best_choice(&peerf, &chanf);
|
|
if (res < 0) {
|
|
ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", chan, chan->nativeformats, peer, peer->nativeformats);
|
|
return -1;
|
|
}
|
|
/* Set read format on channel */
|
|
res = ast_set_read_format(chan, peerf);
|
|
if (res < 0) {
|
|
ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", chan, chanf);
|
|
return -1;
|
|
}
|
|
/* Set write format on peer channel */
|
|
res = ast_set_write_format(peer, peerf);
|
|
if (res < 0) {
|
|
ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", peer, peerf);
|
|
return -1;
|
|
}
|
|
/* Now we go the other way */
|
|
peerf = peer->nativeformats;
|
|
chanf = chan->nativeformats;
|
|
res = ast_translator_best_choice(&chanf, &peerf);
|
|
if (res < 0) {
|
|
ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", peer, peer->nativeformats, chan, chan->nativeformats);
|
|
return -1;
|
|
}
|
|
/* Set writeformat on channel */
|
|
res = ast_set_write_format(chan, chanf);
|
|
if (res < 0) {
|
|
ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", chan, chanf);
|
|
return -1;
|
|
}
|
|
/* Set read format on peer channel */
|
|
res = ast_set_read_format(peer, chanf);
|
|
if (res < 0) {
|
|
ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", peer, peerf);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
int ast_channel_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
|
|
{
|
|
/* Copy voice back and forth between the two channels. Give the peer
|
|
the ability to transfer calls with '#<extension' syntax. */
|
|
struct ast_channel *cs[3];
|
|
int to = -1;
|
|
struct ast_frame *f;
|
|
struct ast_channel *who;
|
|
if (c0->pvt->bridge &&
|
|
(c0->pvt->bridge == c1->pvt->bridge)) {
|
|
/* Looks like they share a bridge code */
|
|
if (!c0->pvt->bridge(c0, c1, flags, fo, rc))
|
|
return 0;
|
|
ast_log(LOG_WARNING, "Private bridge between %s and %s failed\n", c0->name, c1->name);
|
|
/* If they return non-zero then continue on normally */
|
|
}
|
|
|
|
|
|
|
|
cs[0] = c0;
|
|
cs[1] = c1;
|
|
for (/* ever */;;) {
|
|
who = ast_waitfor_n(cs, 2, &to);
|
|
if (!who) {
|
|
ast_log(LOG_WARNING, "Nobody there??\n");
|
|
continue;
|
|
}
|
|
f = ast_read(who);
|
|
if (!f) {
|
|
*fo = NULL;
|
|
*rc = who;
|
|
return 0;
|
|
}
|
|
if ((f->frametype == AST_FRAME_CONTROL) && !(flags & AST_BRIDGE_IGNORE_SIGS)) {
|
|
*fo = f;
|
|
*rc = who;
|
|
return 0;
|
|
}
|
|
if ((f->frametype == AST_FRAME_VOICE) ||
|
|
(f->frametype == AST_FRAME_TEXT) ||
|
|
(f->frametype == AST_FRAME_VIDEO) ||
|
|
(f->frametype == AST_FRAME_IMAGE) ||
|
|
(f->frametype == AST_FRAME_DTMF)) {
|
|
if ((f->frametype == AST_FRAME_DTMF) && (flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1))) {
|
|
if ((who == c0) && (flags & AST_BRIDGE_DTMF_CHANNEL_0)) {
|
|
*rc = c0;
|
|
*fo = f;
|
|
/* Take out of conference mode */
|
|
return 0;
|
|
} else
|
|
if ((who == c1) && (flags & AST_BRIDGE_DTMF_CHANNEL_1)) {
|
|
*rc = c1;
|
|
*fo = f;
|
|
return 0;
|
|
}
|
|
} else {
|
|
#if 0
|
|
ast_log(LOG_DEBUG, "Read from %s\n", who->name);
|
|
if (who == last)
|
|
ast_log(LOG_DEBUG, "Servicing channel %s twice in a row?\n", last->name);
|
|
last = who;
|
|
#endif
|
|
if (who == c0)
|
|
ast_write(c1, f);
|
|
else
|
|
ast_write(c0, f);
|
|
}
|
|
ast_frfree(f);
|
|
} else
|
|
ast_frfree(f);
|
|
/* Swap who gets priority */
|
|
cs[2] = cs[0];
|
|
cs[0] = cs[1];
|
|
cs[1] = cs[2];
|
|
}
|
|
return 0;
|
|
}
|