[WATCHDOG] Documentation/watchdog/src/watchdog-simple.c: improve this code

Make some improvements for Documentation/watchdog/src/watchdog-simple.c.

Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/Documentation/watchdog/src/watchdog-simple.c b/Documentation/watchdog/src/watchdog-simple.c
index 47801bc..4cf72f3 100644 (file)
--- a/Documentation/watchdog/src/watchdog-simple.c
+++ b/Documentation/watchdog/src/watchdog-simple.c
@@ -3,15 +3,25 @@
 #include <unistd.h>
 #include <fcntl.h>
 
-int main(int argc, const char *argv[]) {
+int main(void)
+{
        int fd = open("/dev/watchdog", O_WRONLY);
+       int ret = 0;
        if (fd == -1) {
                perror("watchdog");
-               exit(1);
+               exit(EXIT_FAILURE);
        }
        while (1) {
-               write(fd, "\0", 1);
-               fsync(fd);
+               ret = write(fd, "\0", 1);
+               if (ret != 1) {
+                       ret = -1;
+                       break;
+               }
+               ret = fsync(fd);
+               if (ret)
+                       break;
                sleep(10);
        }
+       close(fd);
+       return ret;
 }