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 <signal.h>
  11#include <sys/ioctl.h>
  12#include <linux/types.h>
  13#include <linux/watchdog.h>
  14
  15int fd;
  16
  17/*
  18 * This function simply sends an IOCTL to the driver, which in turn ticks
  19 * the PC Watchdog card to reset its internal timer so it doesn't trigger
  20 * a computer reset.
  21 */
  22static void keep_alive(void)
  23{
  24    int dummy;
  25
  26    ioctl(fd, WDIOC_KEEPALIVE, &dummy);
  27}
  28
  29/*
  30 * The main program.  Run the program with "-d" to disable the card,
  31 * or "-e" to enable the card.
  32 */
  33
  34static void term(int sig)
  35{
  36    close(fd);
  37    fprintf(stderr, "Stopping watchdog ticks...\n");
  38    exit(0);
  39}
  40
  41int main(int argc, char *argv[])
  42{
  43    int flags;
  44
  45    fd = open("/dev/watchdog", O_WRONLY);
  46
  47    if (fd == -1) {
  48        fprintf(stderr, "Watchdog device not enabled.\n");
  49        fflush(stderr);
  50        exit(-1);
  51    }
  52
  53    if (argc > 1) {
  54        if (!strncasecmp(argv[1], "-d", 2)) {
  55            flags = WDIOS_DISABLECARD;
  56            ioctl(fd, WDIOC_SETOPTIONS, &flags);
  57            fprintf(stderr, "Watchdog card disabled.\n");
  58            fflush(stderr);
  59            goto end;
  60        } else if (!strncasecmp(argv[1], "-e", 2)) {
  61            flags = WDIOS_ENABLECARD;
  62            ioctl(fd, WDIOC_SETOPTIONS, &flags);
  63            fprintf(stderr, "Watchdog card enabled.\n");
  64            fflush(stderr);
  65            goto end;
  66        } else {
  67            fprintf(stderr, "-d to disable, -e to enable.\n");
  68            fprintf(stderr, "run by itself to tick the card.\n");
  69            fflush(stderr);
  70            goto end;
  71        }
  72    } else {
  73        fprintf(stderr, "Watchdog Ticking Away!\n");
  74        fflush(stderr);
  75    }
  76
  77    signal(SIGINT, term);
  78
  79    while(1) {
  80        keep_alive();
  81        sleep(1);
  82    }
  83end:
  84    close(fd);
  85    return 0;
  86}
  87