Index: main/channel.c
===================================================================
--- main/channel.c	(revision 121861)
+++ main/channel.c	(working copy)
@@ -768,9 +768,29 @@
 			return NULL;
 		} else {
 			flags = fcntl(tmp->alertpipe[0], F_GETFL);
-			fcntl(tmp->alertpipe[0], F_SETFL, flags | O_NONBLOCK);
+			if (fcntl(tmp->alertpipe[0], F_SETFL, flags | O_NONBLOCK) < 0) {
+				ast_log(LOG_WARNING, "Unable to set alertpipe nonblocking! (%d: %s)\n", errno, strerror(errno));
+#ifdef HAVE_ZAPTEL
+				if (tmp->timingfd > -1)
+					close(tmp->timingfd);
+#endif
+				sched_context_destroy(tmp->sched);
+				ast_string_field_free_memory(tmp);
+				free(tmp);
+				return NULL;
+			}
 			flags = fcntl(tmp->alertpipe[1], F_GETFL);
-			fcntl(tmp->alertpipe[1], F_SETFL, flags | O_NONBLOCK);
+			if (fcntl(tmp->alertpipe[1], F_SETFL, flags | O_NONBLOCK) < 0) {
+				ast_log(LOG_WARNING, "Unable to set alertpipe nonblocking! (%d: %s)\n", errno, strerror(errno));
+#ifdef HAVE_ZAPTEL
+				if (tmp->timingfd > -1)
+					close(tmp->timingfd);
+#endif
+				sched_context_destroy(tmp->sched);
+				ast_string_field_free_memory(tmp);
+				free(tmp);
+				return NULL;
+			}
 		}
 	} else	/* Make sure we've got it done right if they don't */
 		tmp->alertpipe[0] = tmp->alertpipe[1] = -1;