xref: /linux/samples/watchdog/watchdog-simple.c (revision 24168c5e6dfbdd5b414f048f47f75d64533296ca)
1 // SPDX-License-Identifier: GPL-2.0
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <unistd.h>
5 #include <fcntl.h>
6 
7 int main(void)
8 {
9 	int fd = open("/dev/watchdog", O_WRONLY);
10 	int ret = 0;
11 	if (fd == -1) {
12 		perror("watchdog");
13 		exit(EXIT_FAILURE);
14 	}
15 	while (1) {
16 		ret = write(fd, "\0", 1);
17 		if (ret != 1) {
18 			ret = -1;
19 			break;
20 		}
21 		sleep(10);
22 	}
23 	close(fd);
24 	return ret;
25 }
26