Moxa V2403-C2-W-T [55/90] Examples

V2403 Series Linux Software Programmer’s Guide

4-8

Examples

The example watchdog-test.c acks the watchdog.

* Watchdog Driver Test Program

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <fcntl.h>

#include <signal.h>

#include <sys/ioctl.h>

#include <linux/types.h>

#include <linux/watchdog.h>

int fd;

* This function simply sends an IOCTL to the driver, which in turn ticks

* the PC Watchdog card to reset its internal timer so it doesn't trigger

* a computer reset.

static void keep_alive(void)

{

int dummy;

ioctl(fd, WDIOC_KEEPALIVE, &dummy);

}

* The main program. Run the program with "-d" to disable the card,

* or "-e" to enable the card.

static void term(int sig)

{

close(fd);

fprintf(stderr, "Stopping watchdog ticks...\n");

exit(0);

}

int main(int argc, char *argv[])

{

int flags;

unsigned int ping_rate = 1;

fd = open("/dev/watchdog", O_WRONLY);

if (fd == -1) {

fprintf(stderr, "Watchdog device not enabled.\n");

fflush(stderr);