From 16696af3dfe5b413cf0e94ace565da2cb70a1d57 Mon Sep 17 00:00:00 2001
From: Christian Richter <christian.richter@beronet.com>
Date: Thu, 30 Aug 2007 08:50:44 +0000
Subject: Merged revisions 81367 via svnmerge from
 https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r81367 | crichter | 2007-08-30 10:31:59 +0200 (Do, 30 Aug 2007) | 11 lines

Fixed a severe issue where a misdn_read would lock the channel, but read would
not return because it blocks. later chan_misdn would try to queue a frame like
a AST_CONTROL_ANSWER which could result in a deadlock situation. misdn_read
will now not block forever anymore, and we don't queue the ANSWER frame at all
when we already was called with misdn_answer -> answer would be called twice.

Also we don't explicitly send a RELEASE_COMPLETE on receiption of a RELEASE
anymore, because mISDN does that for us, this resulted in a problem on some
switches, which would block our port after some calls for a short while.


........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@81368 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 channels/chan_misdn.c     | 51 ++++++++++++++++++++++++++++++++++-------------
 channels/misdn/isdn_lib.c |  5 ++---
 2 files changed, 39 insertions(+), 17 deletions(-)

diff --git a/channels/chan_misdn.c b/channels/chan_misdn.c
index 87de8e408..4b1abbb10 100644
--- a/channels/chan_misdn.c
+++ b/channels/chan_misdn.c
@@ -2562,15 +2562,39 @@ static struct ast_frame *misdn_read(struct ast_channel *ast)
 		return NULL;
 	}
 
-	len = read(tmp->pipe[0], tmp->ast_rd_buf, sizeof(tmp->ast_rd_buf));
+	fd_set rrfs;
+	struct timeval tv;
+	tv.tv_sec=0;
+	tv.tv_usec=20000;
 
-	if (len <= 0) {
-		/* we hangup here, since our pipe is closed */
-		chan_misdn_log(2, tmp->bc->port, "misdn_read: Pipe closed, hanging up\n");
+	FD_ZERO(&rrfs);
+	FD_SET(tmp->pipe[0],&rrfs);
+
+	int t=select(FD_SETSIZE,&rrfs,NULL, NULL,&tv);
+
+	if (!t) {
+		chan_misdn_log(3, tmp->bc->port, "read Select Timed out\n");
+		len=160;
+	}
+
+	if (t<0) {
+		chan_misdn_log(-1, tmp->bc->port, "Select Error (err=%s)\n",strerror(errno));
+		return NULL;
+	}
+
+	if (FD_ISSET(tmp->pipe[0],&rrfs)) {
+		len=read(tmp->pipe[0],tmp->ast_rd_buf,sizeof(tmp->ast_rd_buf));
+
+		if (len<=0) {
+			/* we hangup here, since our pipe is closed */
+			chan_misdn_log(2,tmp->bc->port,"misdn_read: Pipe closed, hanging up\n");
+			return NULL;
+		}
+
+	} else {
 		return NULL;
 	}
 
-	tmp->frame.frametype = AST_FRAME_VOICE;
 	tmp->frame.subclass = AST_FORMAT_ALAW;
 	tmp->frame.datalen = len;
 	tmp->frame.samples = len;
@@ -4304,8 +4328,15 @@ cb_events(enum event_e event, struct misdn_bchannel *bc, void *user_data)
 			}
 		}
 	}
+	ch->l3id=bc->l3_id;
+	ch->addr=bc->addr;
+
+	start_bc_tones(ch);
 	
-	/* notice that we don't break here!*/
+	ch->state = MISDN_CONNECTED;
+	
+	ast_queue_control(ch->ast, AST_CONTROL_ANSWER);
+	break;
 	case EVENT_CONNECT_ACKNOWLEDGE:
 	{
 		ch->l3id = bc->l3_id;
@@ -4314,11 +4345,6 @@ cb_events(enum event_e event, struct misdn_bchannel *bc, void *user_data)
 		start_bc_tones(ch);
 
 		ch->state = MISDN_CONNECTED;
-
-		if (!ch->ast)
-			break;
-
-		ast_queue_control(ch->ast, AST_CONTROL_ANSWER);
 	}
 	break;
 	case EVENT_DISCONNECT:
@@ -4377,9 +4403,6 @@ cb_events(enum event_e event, struct misdn_bchannel *bc, void *user_data)
 
 			hangup_chan(ch);
 			release_chan(bc);
-		
-			if (bc->need_release_complete) 
-				misdn_lib_send_event(bc, EVENT_RELEASE_COMPLETE);
 		}
 		break;
 	case EVENT_RELEASE_COMPLETE:
diff --git a/channels/misdn/isdn_lib.c b/channels/misdn/isdn_lib.c
index af8015992..9f4f57fa0 100644
--- a/channels/misdn/isdn_lib.c
+++ b/channels/misdn/isdn_lib.c
@@ -1557,9 +1557,6 @@ static int handle_event ( struct misdn_bchannel *bc, enum event_e event, iframe_
 		case EVENT_PROGRESS:
 		case EVENT_PROCEEDING:
 		case EVENT_SETUP_ACKNOWLEDGE:
-
-		setup_bc(bc);
-
 		case EVENT_SETUP:
 		{
 			if (bc->channel == 0xff || bc->channel<=0)
@@ -1571,6 +1568,8 @@ static int handle_event ( struct misdn_bchannel *bc, enum event_e event, iframe_
 				return -1;
 			}
 		}
+
+		setup_bc(bc);
 		break;
 
 		case EVENT_RELEASE_COMPLETE:
-- 
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