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