set all the child file descriptors to non-blocking so that we don't hang if the child fails to send a newline-terminated command or error message

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@7435 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_externalivr.c

@@ -345,8 +345,6 @@ static int app_exec(struct ast_channel *chan, void *data)
 			goto exit;
 		}
 
-		setvbuf(child_events, NULL, _IONBF, 0);
-
 		if (!(child_commands = fdopen(child_commands_fd, "r"))) {
 			ast_chan_log(LOG_WARNING, chan, "Could not open stream for child commands\n");
 			goto exit;
@@ -357,6 +355,10 @@ static int app_exec(struct ast_channel *chan, void *data)
 			goto exit;
 		}
 
+		setvbuf(child_events, NULL, _IONBF, 0);
+		setvbuf(child_commands, NULL, _IONBF, 0);
+		setvbuf(child_errors, NULL, _IONBF, 0);
+
 		res = 0;
 
 		while (1) {