#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <dev/wscons/wsconsio.h>

#include <err.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int
main(int argc, char *argv[])
{
	struct kevent ev;
	char *device;
	int fd, kq, kev;
	
	if (argc == 2)
		device = argv[1];
	else
		device = "/dev/wskbd";

	fd = open(device, O_RDWR);
	if (fd == -1)
		err(2, "open %s", device);

	if ((kq = kqueue()) <= 0)
		err(2, "kqueue");

	EV_SET(&ev, fd, EVFILT_DEVICE, EV_ADD | EV_ENABLE | EV_CLEAR,
	    NOTE_CHG_DATA, 0, NULL);
	if (kevent(kq, &ev, 1, NULL, 0, NULL) < 0)
		err(2, "kevent init");

	while (1) {
#if 0
		struct pollfd fds;
		int result;

		fds.fd = kq;
		fds.events = POLLIN;
		result = poll(&fds, 1, INFTIM);
		printf("poll result %d\n", result);
#endif		
		kev = kevent(kq, NULL, 0, &ev, 1, NULL);
		printf("kevent -> %d\n", kev);
		if (kev < 0)
			err(2, "kevent");
		if (kev /* && ev.fflags & NOTE_CHG_DATA */) {
			printf("kevent triggered %lx %hd %hx %x %lld\n",
				ev.ident, ev.filter, ev.flags, ev.fflags, ev.data);
		}
	}
		
	return 0;
}