Watchdog Timer Sample Code - Advantech RSB-4411 User Manual

3.7.2

Watchdog Timer Sample Code

WatchDog Timer (WDT) sample code is as below:
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <linux/watchdog.h>
#include <sys/ioctl.h>
#include <unistd.h>
void help_info(void);
int main(int argc, const char *argv[])
{
int fd, timeout, sleep_sec, test;
int count=1;
if (argc < 2) {
}
t imeout = atoi(argv[1]);
sleep_sec = atoi(argv[2]);
if (sleep_sec <= 0) {
}
test = atoi(argv[3]);
printf("Starting wdt_driver (timeout: %d, sleep: %d, test: %s)\n",
fd = open("/dev/watchdog", O_WRONLY);
if (fd == ‐1) {
}
printf("Trying to set timeout value=%d seconds\n", timeout);
ioctl(fd, WDIOC_SETTIMEOUT, &timeout);
printf("The actual timeout was set to %d seconds\n", timeout);
ioctl(fd, WDIOC_GETTIMEOUT, &timeout);
printf("Now reading back ‐‐ The timeout is %d seconds\n", timeout);
while (1) {
help_info();
return 1;
sleep_sec = 1;
printf("correct 0 or negative sleep time to %d seconds\n",
sleep_sec);
timeout, sleep_sec, (test == 0) ? "ioctl" : "write");
perror("watchdog");
exit(1);
printf("WDT Time out counter:%d\n",count);
if ((test !=0) && (test ==count)) {
printf("Ping Watchdog (reset wdt)\n");
ioctl(fd, WDIOC_KEEPALIVE, 0);
test=0;
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