/*
 * Eric Radman, 2012
 */

#include <sys/param.h>
#include <sys/event.h>
#include <sys/time.h>

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

#define NOTE_ALL NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND|NOTE_ATTRIB|NOTE_LINK|NOTE_RENAME|NOTE_REVOKE


void
watch_loop(kq) {
	struct kevent evList[4];
	int i, nev;

	nev = kevent(kq, NULL, 0, evList, 4, 0);
	if (nev == 0)
	    printf("event timeout\n");

	for (i=0; i<nev; i++) {
	    fprintf(stderr, "event %d/%d: flags: 0x%x fflags: 0x%x\n", i+1, nev,
	        evList[i].flags, evList[i].fflags);
	}
}

int main(int argc, char *argv[]) {
	int kq;
	int pid;
	int fd;
	struct kevent evSet;

	fd = open("test-file", O_WRONLY | O_CREAT, 0644);
	write(fd, "abc", 3);
	kq = kqueue(); 

	EV_SET(&evSet, fd, EVFILT_VNODE, EV_ADD | EV_CLEAR, NOTE_ALL, 0, NULL);
	if (kevent(kq, &evSet, 1, NULL, 0, NULL) == -1)
	    err(1, "failed to register VNODE event");

	while(1) {
	    watch_loop(kq);
	}

	close(fd);
	return 0;
}