Implement support for ast_channel_queryoption on local channels. Currently only...

ABE-2229
Review: https://reviewboard.asterisk.org/r/813/

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@280306 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_local.c b/channels/chan_local.c
index 8c826626a730dc0f906fd5261b8cd6d76f30936e..a26b8f718750c9aee6d67f264e3725450e31b0ba 100644 (file)
--- a/channels/chan_local.c
+++ b/channels/chan_local.c
@@ -76,6 +76,7 @@ static int local_sendhtml(struct ast_channel *ast, int subclass, const char *dat
 static int local_sendtext(struct ast_channel *ast, const char *text);
 static int local_devicestate(void *data);
 static struct ast_channel *local_bridgedchannel(struct ast_channel *chan, struct ast_channel *bridge);
+static int local_queryoption(struct ast_channel *ast, int option, void *data, int *datalen);
 
 /* PBX interface structure for channel registration */
 static const struct ast_channel_tech local_tech = {
@@ -98,6 +99,7 @@ static const struct ast_channel_tech local_tech = {
        .send_text = local_sendtext,
        .devicestate = local_devicestate,
        .bridged_channel = local_bridgedchannel,
+       .queryoption = local_queryoption,
 };
 
 struct local_pvt {
@@ -203,6 +205,58 @@ static struct ast_channel *local_bridgedchannel(struct ast_channel *chan, struct
        return bridged;
 }
 
+static int local_queryoption(struct ast_channel *ast, int option, void *data, int *datalen)
+{
+       struct local_pvt *p = ast->tech_pvt;
+       struct ast_channel *chan, *bridged;
+       int res;
+
+       if (!p) {
+               return -1;
+       }
+
+       if (option != AST_OPTION_T38_STATE) {
+               /* AST_OPTION_T38_STATE is the only supported option at this time */
+               return -1;
+       }
+
+       ast_mutex_lock(&p->lock);
+       chan = IS_OUTBOUND(ast, p) ? p->owner : p->chan;
+
+try_again:
+       if (!chan) {
+               ast_mutex_unlock(&p->lock);
+               return -1;
+       }
+
+       if (ast_channel_trylock(chan)) {
+               DEADLOCK_AVOIDANCE(&p->lock);
+               chan = IS_OUTBOUND(ast, p) ? p->owner : p->chan;
+               goto try_again;
+       }
+
+       bridged = ast_bridged_channel(chan);
+       if (!bridged) {
+               /* can't query channel unless we are bridged */
+               ast_mutex_unlock(&p->lock);
+               ast_channel_unlock(chan);
+               return -1;
+       }
+
+       if (ast_channel_trylock(bridged)) {
+               ast_channel_unlock(chan);
+               DEADLOCK_AVOIDANCE(&p->lock);
+               chan = IS_OUTBOUND(ast, p) ? p->owner : p->chan;
+               goto try_again;
+       }
+
+       res = ast_channel_queryoption(bridged, option, data, datalen, 0);
+       ast_mutex_unlock(&p->lock);
+       ast_channel_unlock(chan);
+       ast_channel_unlock(bridged);
+       return res;
+}
+
 static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_frame *f, 
        struct ast_channel *us, int us_locked)
 {