Fix potential segfault, add support for MacOS X locks

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3058 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/lock.h

@@ -20,6 +20,14 @@
 #define AST_PTHREADT_NULL (pthread_t) -1
 #define AST_PTHREADT_STOP (pthread_t) -2
 
+#ifdef __APPLE__
+/* Provide the Linux initializers for MacOS X */
+#define PTHREAD_MUTEX_RECURSIVE_NP					PTHREAD_MUTEX_RECURSIVE
+#define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP		 { 0x4d555458, \
+													   { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
+														 0x20 } }
+#endif
+
 #ifdef DEBUG_THREADS
 
 #ifdef THREAD_CRASH

manager.c

@@ -467,6 +467,10 @@ static int action_redirect(struct mansession *s, struct message *m)
 		return 0;
 	}
 	chan = ast_get_channel_by_name_locked(name);
+	if (!chan) {
+		astman_send_error(s, m, "Channel not existant");
+		return 0;
+	}
 	if (strlen(name2))
 		chan2 = ast_get_channel_by_name_locked(name2);
 	res = ast_async_goto(chan, context, exten, pi);