From: John Crispin <blogic@openwrt.org>
Date: Sun, 14 Dec 2014 21:12:45 +0000 (+0100)
Subject: only write to the watchdog if the fd is valid
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fprocd.git;a=commitdiff_plain;h=61cfe0d093056b85a311f06d44ac149e5dbb4d1a

only write to the watchdog if the fd is valid

Signed-off-by: John Crispin <blogic@openwrt.org>
---

diff --git a/watchdog.c b/watchdog.c
index 3c097e2..592ae7e 100644
--- a/watchdog.c
+++ b/watchdog.c
@@ -35,7 +35,7 @@ static int wdt_frequency = 5;
 void watchdog_ping(void)
 {
 	DEBUG(4, "Ping\n");
-	if (write(wdt_fd, "X", 1) < 0)
+	if (wdt_fd >= 0 && write(wdt_fd, "X", 1) < 0)
 		ERROR("WDT failed to write: %s\n", strerror(errno));
 }