1/*
  2 * Watchdog Driver Test Program
  3 */
  4
  5#include <errno.h>
  6#include <stdio.h>
  7#include <stdlib.h>
  8#include <string.h>
  9#include <unistd.h>
 10#include <fcntl.h>
 11#include <signal.h>
 12#include <sys/ioctl.h>
 13#include <linux/types.h>
 14#include <linux/watchdog.h>
 15
 16int fd;
 17const char v = 'V';
 18
 19/*
 20 * This function simply sends an IOCTL to the driver, which in turn ticks
 21 * the PC Watchdog card to reset its internal timer so it doesn't trigger
 22 * a computer reset.
 23 */
 24static void keep_alive(void)
 25{
 26    int dummy;
 27
 28    printf(".");
 29    ioctl(fd, WDIOC_KEEPALIVE, &dummy);
 30}
 31
 32/*
 33 * The main program.  Run the program with "-d" to disable the card,
 34 * or "-e" to enable the card.
 35 */
 36
 37static void term(int sig)
 38{
 39    int ret = write(fd, &v, 1);
 40
 41    close(fd);
 42    if (ret < 0)
 43	printf("\nStopping watchdog ticks failed (%d)...\n", errno);
 44    else
 45	printf("\nStopping watchdog ticks...\n");
 46    exit(0);
 47}
 48
 49int main(int argc, char *argv[])
 50{
 51    int flags;
 52    unsigned int ping_rate = 1;
 53    int ret;
 54
 55    setbuf(stdout, NULL);
 56
 57    fd = open("/dev/watchdog", O_WRONLY);
 58
 59    if (fd == -1) {
 60	printf("Watchdog device not enabled.\n");
 61	exit(-1);
 62    }
 63
 64    if (argc > 1) {
 65	if (!strncasecmp(argv[1], "-d", 2)) {
 66	    flags = WDIOS_DISABLECARD;
 67	    ioctl(fd, WDIOC_SETOPTIONS, &flags);
 68	    printf("Watchdog card disabled.\n");
 69	    goto end;
 70	} else if (!strncasecmp(argv[1], "-e", 2)) {
 71	    flags = WDIOS_ENABLECARD;
 72	    ioctl(fd, WDIOC_SETOPTIONS, &flags);
 73	    printf("Watchdog card enabled.\n");
 74	    goto end;
 75	} else if (!strncasecmp(argv[1], "-t", 2) && argv[2]) {
 76	    flags = atoi(argv[2]);
 77	    ioctl(fd, WDIOC_SETTIMEOUT, &flags);
 78	    printf("Watchdog timeout set to %u seconds.\n", flags);
 79	    goto end;
 80	} else if (!strncasecmp(argv[1], "-p", 2) && argv[2]) {
 81	    ping_rate = strtoul(argv[2], NULL, 0);
 82	    printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
 83	} else {
 84	    printf("-d to disable, -e to enable, -t <n> to set " \
 85		"the timeout,\n-p <n> to set the ping rate, and \n");
 86	    printf("run by itself to tick the card.\n");
 87	    goto end;
 88	}
 89    }
 90
 91    printf("Watchdog Ticking Away!\n");
 92
 93    signal(SIGINT, term);
 94
 95    while(1) {
 96	keep_alive();
 97	sleep(ping_rate);
 98    }
 99end:
100    ret = write(fd, &v, 1);
101    if (ret < 0)
102	printf("Stopping watchdog ticks failed (%d)...\n", errno);
103    close(fd);
104    return 0;
105}