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
  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  */
  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
  34 static void term(int sig)
  35 {
  36     close(fd);
  37     fprintf(stderr, "Stopping watchdog ticks...\n");
  38     exit(0);
  39 }
  40
  41 int 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     }
  83 end:
  84     close(fd);
  85     return 0;
  86 }