#include <sys/event.h>
#include <sys/socket.h>

#include <err.h>
#include <stdio.h>
#include <time.h>
#include <util.h>

#define	EV_FMT	"\177\020"						      \
	"b\000"	"EV_ADD"	"\0"					      \
	"b\001"	"EV_DELETE"	"\0"					      \
	"b\002"	"EV_ENABLE"	"\0"					      \
	"b\003"	"EV_DISABLE"	"\0"					      \
	"b\004"	"EV_ONESHOT"	"\0"					      \
	"b\005"	"EV_CLEAR"	"\0"					      \
	"b\006"	"EV_RECEIPT"	"\0"					      \
	"b\007"	"EV_DISPATCH"	"\0"					      \
	"b\015"	"EV_FLAG1"	"\0"					      \
	"b\016"	"EV_ERROR"	"\0"					      \
	"b\017"	"EV_EOF"	"\0"					      \
	""

int
main(void)
{
	int kq, sock[2];
	struct kevent ev;
	char buf[256];

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

	if (socketpair(AF_UNIX, SOCK_STREAM, 0, sock) == -1)
		err(1, "socketpair");

	EV_SET(&ev, sock[1], EVFILT_READ, EV_ADD|EV_ENABLE, 0, 0, 0);
	if (kevent(kq, &ev, 1, NULL, 0, &(struct timespec){0,0}) == -1)
		err(1, "kevent");

	if (shutdown(sock[0], SHUT_WR) == -1)
		err(1, "shutdown");

	if (kevent(kq, NULL, 0, &ev, 1, &(struct timespec){0,0}) == -1)
		err(1, "kevent");
	snprintb(buf, sizeof(buf), EV_FMT, ev.flags);
	printf("ident=%llu\n", (long long)ev.ident);
	printf("filter=%llu\n", (long long)ev.filter);
	printf("flags=%s\n", buf);
	printf("fflags=0x%llx\n", (long long)ev.fflags);
	printf("data=%llu\n", (long long)ev.data);
	printf("data=%llu\n", (long long)ev.udata);
	fflush(stdout);
	return ferror(stdout);
}