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    unsigned int ping_rate = 1;
  45
  46    fd = open("/dev/watchdog", O_WRONLY);
  47
  48    if (fd == -1) {
  49        fprintf(stderr, "Watchdog device not enabled.\n");
  50        fflush(stderr);
  51        exit(-1);
  52    }
  53
  54    if (argc > 1) {
  55        if (!strncasecmp(argv[1], "-d", 2)) {
  56            flags = WDIOS_DISABLECARD;
  57            ioctl(fd, WDIOC_SETOPTIONS, &flags);
  58            fprintf(stderr, "Watchdog card disabled.\n");
  59            fflush(stderr);
  60            goto end;
  61        } else if (!strncasecmp(argv[1], "-e", 2)) {
  62            flags = WDIOS_ENABLECARD;
  63            ioctl(fd, WDIOC_SETOPTIONS, &flags);
  64            fprintf(stderr, "Watchdog card enabled.\n");
  65            fflush(stderr);
  66            goto end;
  67        } else if (!strncasecmp(argv[1], "-t", 2) && argv[2]) {
  68            flags = atoi(argv[2]);
  69            ioctl(fd, WDIOC_SETTIMEOUT, &flags);
  70            fprintf(stderr, "Watchdog timeout set to %u seconds.\n", flags);
  71            fflush(stderr);
  72            goto end;
  73        } else if (!strncasecmp(argv[1], "-p", 2) && argv[2]) {
  74            ping_rate = strtoul(argv[2], NULL, 0);
  75            fprintf(stderr, "Watchdog ping rate set to %u seconds.\n", ping_rate);
  76            fflush(stderr);
  77        } else {
  78            fprintf(stderr, "-d to disable, -e to enable, -t <n> to set " \
  79                "the timeout,\n-p <n> to set the ping rate, and \n");
  80            fprintf(stderr, "run by itself to tick the card.\n");
  81            fflush(stderr);
  82            goto end;
  83        }
  84    }
  85
  86    fprintf(stderr, "Watchdog Ticking Away!\n");
  87    fflush(stderr);
  88
  89    signal(SIGINT, term);
  90
  91    while(1) {
  92        keep_alive();
  93        sleep(ping_rate);
  94    }
  95end:
  96    close(fd);
  97    return 0;
  98}
  99