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watchdog-test.c

/*
 * Watchdog Driver Test Program
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.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.
 */
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.
 */
int main(int argc, char *argv[])
{
    fd = open("/dev/watchdog", O_WRONLY);

    if (fd == -1) {
      fprintf(stderr, "Watchdog device not enabled.\n");
      fflush(stderr);
      exit(-1);
    }

    if (argc > 1) {
      if (!strncasecmp(argv[1], "-d", 2)) {
          ioctl(fd, WDIOC_SETOPTIONS, WDIOS_DISABLECARD);
          fprintf(stderr, "Watchdog card disabled.\n");
          fflush(stderr);
          exit(0);
      } else if (!strncasecmp(argv[1], "-e", 2)) {
          ioctl(fd, WDIOC_SETOPTIONS, WDIOS_ENABLECARD);
          fprintf(stderr, "Watchdog card enabled.\n");
          fflush(stderr);
          exit(0);
      } else {
          fprintf(stderr, "-d to disable, -e to enable.\n");
          fprintf(stderr, "run by itself to tick the card.\n");
          fflush(stderr);
          exit(0);
      }
    } else {
      fprintf(stderr, "Watchdog Ticking Away!\n");
      fflush(stderr);
    }

    while(1) {
      keep_alive();
      sleep(1);
    }
}

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