int watchdog_ping(void) {
int r;
if (watchdog_fd < 0) {
r = open_watchdog();
if (r < 0)
return r;
}
r = ioctl(watchdog_fd, WDIOC_KEEPALIVE, 0);
if (r < 0)
return log_warning_errno(errno, "Failed to ping hardware watchdog: %m");
return 0;
}
int watchdog_set_timeout(usec_t *usec) {
int r;
watchdog_timeout = *usec;
/* If we didn't open the watchdog yet and didn't get any
* explicit timeout value set, don't do anything */
if (watchdog_fd < 0 && watchdog_timeout == USEC_INFINITY)
return 0;
if (watchdog_fd < 0)
r = open_watchdog();
else
r = update_timeout();
*usec = watchdog_timeout;
return r;
}