From a59d1dc73b33729aad7883096b4cc9473edd0fb2 Mon Sep 17 00:00:00 2001
From: Daniel Beer <daniel@tortek.co.nz>
Date: Fri, 13 Aug 2010 19:08:27 +1200
Subject: [PATCH] Bug fix: check file descriptor after opening serial device.

---
 util.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/util.c b/util.c
index bdf1aab..bc66018 100644
--- a/util.c
+++ b/util.c
@@ -113,6 +113,9 @@ int open_serial(const char *device, int rate)
 	int fd = open(device, O_RDWR | O_NOCTTY);
 	struct termios attr;
 
+	if (fd < 0)
+		return -1;
+
 	tcgetattr(fd, &attr);
 	cfmakeraw(&attr);
 	cfsetispeed(&attr, rate);