From 5420052258a4af82ea938d85797270f225fc20ad Mon Sep 17 00:00:00 2001
From: Drew <drew.a.gross@gmail.com>
Date: Tue, 27 Oct 2015 22:21:53 -0700
Subject: Return -2 when reading from Serial port times out

This will assist callers to detect timeouts.
---
 arduino-serial-lib.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arduino-serial-lib.c b/arduino-serial-lib.c
index d9dbe91..39461ce 100644
--- a/arduino-serial-lib.c
+++ b/arduino-serial-lib.c
@@ -128,6 +128,7 @@ int serialport_read_until(int fd, char* buf, char until, int buf_max, int timeou
         if( n==0 ) {
             usleep( 1 * 1000 );  // wait 1 msec try again
             timeout--;
+            if( timeout==0 ) return -2;
             continue;
         }
 #ifdef SERIALPORTDEBUG  
-- 
cgit v1.2.3