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/*
* Watchdog Driver Test Program
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/watchdog.h>
int fd;
const char v = 'V';
/*
* This function simply sends an IOCTL to the driver, which in turn ticks
* the PC Watchdog card to reset its internal timer so it doesn't trigger
* a computer reset.
*/
static void keep_alive(void)
{
int dummy;
printf(".");
ioctl(fd, WDIOC_KEEPALIVE, &dummy);
}
/*
* The main program. Run the program with "-d" to disable the card,
* or "-e" to enable the card.
*/
static void term(int sig)
{
write(fd, &v, 1);
close(fd);
printf("\nStopping watchdog ticks...\n");
exit(0);
}
int main(int argc, char *argv[])
{
int flags;
unsigned int ping_rate = 1;
setbuf(stdout, NULL);
fd = open("/dev/watchdog", O_WRONLY);
if (fd == -1) {
printf("Watchdog device not enabled.\n");
exit(-1);
}
if (argc > 1) {
if (!strncasecmp(argv[1], "-d", 2)) {
flags = WDIOS_DISABLECARD;
ioctl(fd, WDIOC_SETOPTIONS, &flags);
printf("Watchdog card disabled.\n");
goto end;
} else if (!strncasecmp(argv[1], "-e", 2)) {
flags = WDIOS_ENABLECARD;
ioctl(fd, WDIOC_SETOPTIONS, &flags);
printf("Watchdog card enabled.\n");
goto end;
} else if (!strncasecmp(argv[1], "-t", 2) && argv[2]) {
flags = atoi(argv[2]);
ioctl(fd, WDIOC_SETTIMEOUT, &flags);
printf("Watchdog timeout set to %u seconds.\n", flags);
goto end;
} else if (!strncasecmp(argv[1], "-p", 2) && argv[2]) {
ping_rate = strtoul(argv[2], NULL, 0);
printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
} else {
printf("-d to disable, -e to enable, -t <n> to set " \
"the timeout,\n-p <n> to set the ping rate, and \n");
printf("run by itself to tick the card.\n");
goto end;
}
}
printf("Watchdog Ticking Away!\n");
signal(SIGINT, term);
while(1) {
keep_alive();
sleep(ping_rate);
}
end:
write(fd, &v, 1);
close(fd);
return 0;
}
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