1 files changed, 308 insertions, 0 deletions
diff --git a/1.6.1/main/autoservice.c b/1.6.1/main/autoservice.c
new file mode 100644
index 000000000..d3d0333d1
--- /dev/null
+++ b/1.6.1/main/autoservice.c
@@ -0,0 +1,308 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2008, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ * Russell Bryant <russell@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Automatic channel service routines
+ *
+ * \author Mark Spencer <markster@digium.com> 
+ * \author Russell Bryant <russell@digium.com>
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <sys/time.h>
+#include <signal.h>
+
+#include "asterisk/_private.h" /* prototype for ast_autoservice_init() */
+
+#include "asterisk/pbx.h"
+#include "asterisk/frame.h"
+#include "asterisk/sched.h"
+#include "asterisk/channel.h"
+#include "asterisk/file.h"
+#include "asterisk/translate.h"
+#include "asterisk/manager.h"
+#include "asterisk/chanvars.h"
+#include "asterisk/linkedlists.h"
+#include "asterisk/indications.h"
+#include "asterisk/lock.h"
+#include "asterisk/utils.h"
+
+#define MAX_AUTOMONS 1500
+
+struct asent {
+	struct ast_channel *chan;
+	/*! This gets incremented each time autoservice gets started on the same
+	 *  channel.  It will ensure that it doesn't actually get stopped until 
+	 *  it gets stopped for the last time. */
+	unsigned int use_count;
+	unsigned int orig_end_dtmf_flag:1;
+	AST_LIST_HEAD_NOLOCK(, ast_frame) deferred_frames;
+	AST_LIST_ENTRY(asent) list;
+};
+
+static AST_LIST_HEAD_STATIC(aslist, asent);
+static ast_cond_t as_cond;
+
+static pthread_t asthread = AST_PTHREADT_NULL;
+
+static int as_chan_list_state;
+
+static void *autoservice_run(void *ign)
+{
+	for (;;) {
+		struct ast_channel *mons[MAX_AUTOMONS];
+		struct asent *ents[MAX_AUTOMONS];
+		struct ast_channel *chan;
+		struct asent *as;
+		int i, x = 0, ms = 50;
+		struct ast_frame *f = NULL;
+		struct ast_frame *defer_frame = NULL;
+
+		AST_LIST_LOCK(&aslist);
+
+		/* At this point, we know that no channels that have been removed are going
+		 * to get used again. */
+		as_chan_list_state++;
+
+		if (AST_LIST_EMPTY(&aslist)) {
+			ast_cond_wait(&as_cond, &aslist.lock);
+		}
+
+		AST_LIST_TRAVERSE(&aslist, as, list) {
+			if (!ast_check_hangup(as->chan)) {
+				if (x < MAX_AUTOMONS) {
+					ents[x] = as;
+					mons[x++] = as->chan;
+				} else {
+					ast_log(LOG_WARNING, "Exceeded maximum number of automatic monitoring events.  Fix autoservice.c\n");
+				}
+			}
+		}
+
+		AST_LIST_UNLOCK(&aslist);
+
+		if (!x) {
+			continue;
+		}
+
+		chan = ast_waitfor_n(mons, x, &ms);
+		if (!chan) {
+			continue;
+		}
+
+		f = ast_read(chan);
+	
+		if (!f) {
+			struct ast_frame hangup_frame = { 0, };
+			/* No frame means the channel has been hung up.
+			 * A hangup frame needs to be queued here as ast_waitfor() may
+			 * never return again for the condition to be detected outside
+			 * of autoservice.  So, we'll leave a HANGUP queued up so the
+			 * thread in charge of this channel will know. */
+
+			hangup_frame.frametype = AST_FRAME_CONTROL;
+			hangup_frame.subclass = AST_CONTROL_HANGUP;
+
+			defer_frame = &hangup_frame;
+		} else {
+
+			/* Do not add a default entry in this switch statement.  Each new
+			 * frame type should be addressed directly as to whether it should
+			 * be queued up or not. */
+
+			switch (f->frametype) {
+			/* Save these frames */
+			case AST_FRAME_DTMF_END:
+			case AST_FRAME_CONTROL:
+			case AST_FRAME_TEXT:
+			case AST_FRAME_IMAGE:
+			case AST_FRAME_HTML:
+				defer_frame = f;
+				break;
+
+			/* Throw these frames away */
+			case AST_FRAME_DTMF_BEGIN:
+			case AST_FRAME_VOICE:
+			case AST_FRAME_VIDEO:
+			case AST_FRAME_NULL:
+			case AST_FRAME_IAX:
+			case AST_FRAME_CNG:
+			case AST_FRAME_MODEM:
+				break;
+			}
+		}
+
+		if (defer_frame) {
+			for (i = 0; i < x; i++) {
+				struct ast_frame *dup_f;
+				
+				if (mons[i] != chan) {
+					continue;
+				}
+				
+				if ((dup_f = ast_frdup(defer_frame))) {
+					AST_LIST_INSERT_TAIL(&ents[i]->deferred_frames, dup_f, frame_list);
+				}
+				
+				break;
+			}
+		}
+
+		if (f) {
+			ast_frfree(f);
+		}
+	}
+
+	asthread = AST_PTHREADT_NULL;
+
+	return NULL;
+}
+
+int ast_autoservice_start(struct ast_channel *chan)
+{
+	int res = 0;
+	struct asent *as;
+
+	AST_LIST_LOCK(&aslist);
+	AST_LIST_TRAVERSE(&aslist, as, list) {
+		if (as->chan == chan) {
+			as->use_count++;
+			break;
+		}
+	}
+	AST_LIST_UNLOCK(&aslist);
+
+	if (as) {
+		/* Entry exists, autoservice is already handling this channel */
+		return 0;
+	}
+
+	if (!(as = ast_calloc(1, sizeof(*as))))
+		return -1;
+	
+	/* New entry created */
+	as->chan = chan;
+	as->use_count = 1;
+
+	ast_channel_lock(chan);
+	as->orig_end_dtmf_flag = ast_test_flag(chan, AST_FLAG_END_DTMF_ONLY) ? 1 : 0;
+	if (!as->orig_end_dtmf_flag)
+		ast_set_flag(chan, AST_FLAG_END_DTMF_ONLY);
+	ast_channel_unlock(chan);
+
+	AST_LIST_LOCK(&aslist);
+
+	if (AST_LIST_EMPTY(&aslist) && asthread != AST_PTHREADT_NULL) {
+		ast_cond_signal(&as_cond);
+	}
+
+	AST_LIST_INSERT_HEAD(&aslist, as, list);
+
+	if (asthread == AST_PTHREADT_NULL) { /* need start the thread */
+		if (ast_pthread_create_background(&asthread, NULL, autoservice_run, NULL)) {
+			ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
+			/* There will only be a single member in the list at this point,
+			   the one we just added. */
+			AST_LIST_REMOVE(&aslist, as, list);
+			free(as);
+			asthread = AST_PTHREADT_NULL;
+			res = -1;
+		} else {
+			pthread_kill(asthread, SIGURG);
+		}
+	}
+
+	AST_LIST_UNLOCK(&aslist);
+
+	return res;
+}
+
+int ast_autoservice_stop(struct ast_channel *chan)
+{
+	int res = -1;
+	struct asent *as, *removed = NULL;
+	struct ast_frame *f;
+	int chan_list_state;
+
+	AST_LIST_LOCK(&aslist);
+
+	/* Save the autoservice channel list state.  We _must_ verify that the channel
+	 * list has been rebuilt before we return.  Because, after we return, the channel
+	 * could get destroyed and we don't want our poor autoservice thread to step on
+	 * it after its gone! */
+	chan_list_state = as_chan_list_state;
+
+	/* Find the entry, but do not free it because it still can be in the
+	   autoservice thread array */
+	AST_LIST_TRAVERSE_SAFE_BEGIN(&aslist, as, list) {	
+		if (as->chan == chan) {
+			as->use_count--;
+			if (as->use_count < 1) {
+				AST_LIST_REMOVE_CURRENT(list);
+				removed = as;
+			}
+			break;
+		}
+	}
+	AST_LIST_TRAVERSE_SAFE_END;
+
+	if (removed && asthread != AST_PTHREADT_NULL) {
+		pthread_kill(asthread, SIGURG);
+	}
+
+	AST_LIST_UNLOCK(&aslist);
+
+	if (!removed) {
+		return 0;
+	}
+
+	/* Wait while autoservice thread rebuilds its list. */
+	while (chan_list_state == as_chan_list_state) {
+		usleep(1000);
+	}
+
+	/* Now autoservice thread should have no references to our entry
+	   and we can safely destroy it */
+
+	if (!chan->_softhangup) {
+		res = 0;
+	}
+
+	if (!as->orig_end_dtmf_flag) {
+		ast_clear_flag(chan, AST_FLAG_END_DTMF_ONLY);
+	}
+
+	while ((f = AST_LIST_REMOVE_HEAD(&as->deferred_frames, frame_list))) {
+		ast_queue_frame(chan, f);
+		ast_frfree(f);
+	}
+
+	free(as);
+
+	return res;
+}
+
+void ast_autoservice_init(void)
+{
+	ast_cond_init(&as_cond, NULL);
+}