Documentation/watchdog/src/watchdog-simple.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <fcntl.h>
   5
   6 int main(void)
   7 {
   8         int fd = open("/dev/watchdog", O_WRONLY);
   9         int ret = 0;
  10         if (fd == -1) {
  11                 perror("watchdog");
  12                 exit(EXIT_FAILURE);
  13         }
  14         while (1) {
  15                 ret = write(fd, "\0", 1);
  16                 if (ret != 1) {
  17                         ret = -1;
  18                         break;
  19                 }
  20                 ret = fsync(fd);
  21                 if (ret)
  22                         break;
  23                 sleep(10);
  24         }
  25         close(fd);
  26         return ret;
  27 }