kqtimer-stop.c

#include <sys/param.h>
#include <sys/event.h>
#include <err.h>
#include <stdbool.h>
#include <stdio.h>

int
main(void)
{
	struct kevent wev[1], rev[1];
	int error, kq;

	kq = kqueue();
	if (kq == -1)
		err(1, "kqueue");

	EV_SET(&wev[0], 1, EVFILT_TIMER, EV_ADD, NOTE_SECONDS, 1, 0);
	error = kevent(kq, wev, nitems(wev), NULL, 0, NULL);
	if (error != 0)
		err(1, "kevent register");

	while (true) {
		error = kevent(kq, NULL, 0, rev, nitems(rev), NULL);
		if (error < 0)
			err(1, "kevent read");
		if (error == 0)
			continue;
		printf("event %p filt %d flag %x fflag %x data %jd\n",
		    (void *)rev[0].ident, rev[0].filter, rev[0].flags,
		    rev[0].fflags, (uintmax_t)rev[0].data);
	}
}