Documentation/watchdog/src/watchdog-test.c

   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
  16 int fd;
  17 const 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  */
  24 static 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
  37 static 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
  49 int 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     }
  99 end:
 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 }