Commit 06063e26 authored by WANG Cong's avatar WANG Cong Committed by Wim Van Sebroeck

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

Make some improvements for Documentation/watchdog/src/watchdog-simple.c.
Signed-off-by: default avatarWANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent c283cf2c
...@@ -3,15 +3,25 @@ ...@@ -3,15 +3,25 @@
#include <unistd.h> #include <unistd.h>
#include <fcntl.h> #include <fcntl.h>
int main(int argc, const char *argv[]) { int main(void)
{
int fd = open("/dev/watchdog", O_WRONLY); int fd = open("/dev/watchdog", O_WRONLY);
int ret = 0;
if (fd == -1) { if (fd == -1) {
perror("watchdog"); perror("watchdog");
exit(1); exit(EXIT_FAILURE);
} }
while (1) { while (1) {
write(fd, "\0", 1); ret = write(fd, "\0", 1);
fsync(fd); if (ret != 1) {
ret = -1;
break;
}
ret = fsync(fd);
if (ret)
break;
sleep(10); sleep(10);
} }
close(fd);
return ret;
} }
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