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
15 int 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 */
keep_alive(void)22 static 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
term(int sig)34 static void term(int sig)
35 {
36 close(fd);
37 fprintf(stderr, "Stopping watchdog ticks...\n");
38 exit(0);
39 }
40
main(int argc,char * argv[])41 int 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 }
95 end:
96 close(fd);
97 return 0;
98 }
99