int setup_watchdog(struct tevent_context *ev, int interval)
{
struct sigevent sev;
struct itimerspec its;
struct tevent_fd *tfd;
int signum = SIGRTMIN;
int ret;
memset(&sev, 0, sizeof(sev));
CatchSignal(signum, watchdog_handler);
sev.sigev_notify = SIGEV_SIGNAL;
sev.sigev_signo = signum;
sev.sigev_value.sival_ptr = &watchdog_ctx.timerid;
errno = 0;
ret = timer_create(CLOCK_MONOTONIC, &sev, &watchdog_ctx.timerid);
if (ret == -1) {
ret = errno;
DEBUG(SSSDBG_FATAL_FAILURE,
"Failed to create watchdog timer (%d) [%s]\n",
ret, strerror(ret));
return ret;
}
if (interval == 0) {
interval = WATCHDOG_DEF_INTERVAL;
}
watchdog_ctx.interval.tv_sec = interval;
watchdog_ctx.interval.tv_usec = 0;
watchdog_ctx.ev = ev;
watchdog_ctx.input_interval = interval;
watchdog_ctx.timestamp = time(NULL);
ret = pipe(watchdog_ctx.pipefd);
if (ret == -1) {
ret = errno;
DEBUG(SSSDBG_FATAL_FAILURE,
"pipe failed [%d] [%s].\n", ret, strerror(ret));
return ret;
}
sss_fd_nonblocking(watchdog_ctx.pipefd[0]);
sss_fd_nonblocking(watchdog_ctx.pipefd[1]);
tfd = tevent_add_fd(ev, (TALLOC_CTX *)ev, watchdog_ctx.pipefd[0],
TEVENT_FD_READ, watchdog_fd_read_handler, NULL);
watchdog_ctx.tfd = tfd;
/* Start the timer */
/* we give 1 second head start to the watchdog event */
its.it_value.tv_sec = interval + 1;
its.it_value.tv_nsec = 0;
its.it_interval.tv_sec = interval;
its.it_interval.tv_nsec = 0;
errno = 0;
ret = timer_settime(watchdog_ctx.timerid, 0, &its, NULL);
if (ret == -1) {
ret = errno;
DEBUG(SSSDBG_FATAL_FAILURE,
"Failed to create watchdog timer (%d) [%s]\n",
ret, strerror(ret));
return ret;
}
/* Add the watchdog event and make it fire as fast as the timer */
watchdog_event_handler(ev, NULL, tevent_timeval_zero(), NULL);
return EOK;
}