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

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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>
This commit is contained in:
WANG Cong 2007-10-06 11:17:13 +08:00 committed by Wim Van Sebroeck
parent c283cf2c09
commit 06063e26bc
1 changed files with 14 additions and 4 deletions
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18
Documentation/watchdog/src/watchdog-simple.c
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@ -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;
}