//ripped from the netbsd man page for kqueue
//and modified very slightly.
//I'll add some more stuff as I find a use for it.
           #include <sys/types.h>
           #include <sys/event.h>
           #include <sys/time.h>
           #include <stdio.h>
           #include <unistd.h>
           #include <stdlib.h>
           #include <fcntl.h>
           #include <err.h>

           int
           main(int argc, char *argv[])
           {
                   int fd, kq, nev;
                   struct kevent ev;
                   static const struct timespec tout = { 1, 0 };

                   if ((fd = open(argv[1], O_RDONLY)) == -1)
                           err(1, "Cannot open `%s'", argv[1]);

                   if ((kq = kqueue()) == -1)
                           err(1, "Cannot create kqueue");

                   EV_SET(&ev, fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
                       NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND|NOTE_ATTRIB|NOTE_LINK|
                       NOTE_RENAME|NOTE_REVOKE, 0, 0);
                   if (kevent(kq, &ev, 1, NULL, 0, &tout) == -1)
                           err(1, "kevent");
                   for (;;) {
                           nev = kevent(kq, NULL, 0, &ev, 1, &tout);
                           if (nev == -1)
                                   err(1, "kevent");
                           if (nev == 0)
                                   continue;
                           if (ev.fflags & (NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND|NOTE_ATTRIB|NOTE_LINK|NOTE_RENAME|NOTE_REVOKE)) {
                                   printf("%s: ",argv[1]);
                           }
                           if (ev.fflags & NOTE_DELETE) {
                                   printf("deleted ");
                                   ev.fflags &= ~NOTE_DELETE;
                           }
                           if (ev.fflags & NOTE_WRITE) {
                                   printf("written ");
                                   ev.fflags &= ~NOTE_WRITE;
                           }
                           if (ev.fflags & NOTE_EXTEND) {
                                   printf("extended ");
                                   ev.fflags &= ~NOTE_EXTEND;
                           }
                           if (ev.fflags & NOTE_ATTRIB) {
                                   printf("chmod/chown/utimes ");
                                   ev.fflags &= ~NOTE_ATTRIB;
                           }
                           if (ev.fflags & NOTE_LINK) {
                                   printf("hardlinked ");
                                   ev.fflags &= ~NOTE_LINK;
                           }
                           if (ev.fflags & NOTE_RENAME) {
                                   printf("renamed ");
                                   ev.fflags &= ~NOTE_RENAME;
                           }
                           if (ev.fflags & NOTE_REVOKE) {
                                   printf("revoked ");
                                   ev.fflags &= ~NOTE_REVOKE;
                           }
                           printf("\n");
                           if (ev.fflags)
                                   warnx("unknown event 0x%x\n", ev.fflags);
                   }
           }