Function Monitor

tools/ngctl/main.c:278–310

* Thread that monitors csock and dsock while main thread * can be blocked in el_gets(). */

 * can be blocked in el_gets().
 */
static void *
Monitor(void *v __unused)
{
	struct sigaction act;
	const int maxfd = MAX(csock, dsock) + 1;

	act.sa_handler = Unblock;
	sigemptyset(&act.sa_mask);
	act.sa_flags = 0;
	sigaction(SIGUSR1, &act, NULL);

	pthread_mutex_lock(&mutex);
	for (;;) {
		fd_set rfds;

		/* See if any data or control messages are arriving. */
		FD_ZERO(&rfds);
		FD_SET(csock, &rfds);
		FD_SET(dsock, &rfds);
		unblock = 0;
		if (select(maxfd, &rfds, NULL, NULL, NULL) <= 0) {
			if (errno == EINTR) {
				if (unblock == 1)
					pthread_cond_wait(&cond, &mutex);
				continue;
			}
			err(EX_OSERR, "select");
		}
		ReadSockets(&rfds);
	}

	return (NULL);
}
#endif

static char *