watchdog-simple.c 382 B

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  1. // SPDX-License-Identifier: GPL-2.0
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <unistd.h>
  5. #include <fcntl.h>
  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. sleep(10);
  21. }
  22. close(fd);
  23. return ret;
  24. }