LXR linux/Documentation/watchdog/src/watchdog-test.c

   1/*
   2 * Watchdog Driver Test Program
   3 */
   4
   5#include <stdio.h>
   6#include <stdlib.h>
   7#include <string.h>
   8#include <unistd.h>
   9#include <fcntl.h>
  10#include <sys/ioctl.h>
  11#include <linux/types.h>
  12#include <linux/watchdog.h>
  13
  14int fd;
  15
  16/*
  17 * This function simply sends an IOCTL to the driver, which in turn ticks
  18 * the PC Watchdog card to reset its internal timer so it doesn't trigger
  19 * a computer reset.
  20 */
  21static void keep_alive(void)
  22{
  23    int dummy;
  24
  25    ioctl(fd, WDIOC_KEEPALIVE, &dummy);
  26}
  27
  28/*
  29 * The main program.  Run the program with "-d" to disable the card,
  30 * or "-e" to enable the card.
  31 */
  32int main(int argc, char *argv[])
  33{
  34    fd = open("/dev/watchdog", O_WRONLY);
  35
  36    if (fd == -1) {
  37        fprintf(stderr, "Watchdog device not enabled.\n");
  38        fflush(stderr);
  39        exit(-1);
  40    }
  41
  42    if (argc > 1) {
  43        if (!strncasecmp(argv[1], "-d", 2)) {
  44            ioctl(fd, WDIOC_SETOPTIONS, WDIOS_DISABLECARD);
  45            fprintf(stderr, "Watchdog card disabled.\n");
  46            fflush(stderr);
  47            exit(0);
  48        } else if (!strncasecmp(argv[1], "-e", 2)) {
  49            ioctl(fd, WDIOC_SETOPTIONS, WDIOS_ENABLECARD);
  50            fprintf(stderr, "Watchdog card enabled.\n");
  51            fflush(stderr);
  52            exit(0);
  53        } else {
  54            fprintf(stderr, "-d to disable, -e to enable.\n");
  55            fprintf(stderr, "run by itself to tick the card.\n");
  56            fflush(stderr);
  57            exit(0);
  58        }
  59    } else {
  60        fprintf(stderr, "Watchdog Ticking Away!\n");
  61        fflush(stderr);
  62    }
  63
  64    while(1) {
  65        keep_alive();
  66        sleep(1);
  67    }
  68}
  69