1// SPDX-License-Identifier: GPL-2.0
 2#include <stdio.h>
 3#include <stdlib.h>
 4#include <unistd.h>
 5#include <fcntl.h>
 6
 7int 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}

 1// SPDX-License-Identifier: GPL-2.0
 2#include <stdio.h>
 3#include <stdlib.h>
 4#include <unistd.h>
 5#include <fcntl.h>
 6
 7int 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}