/*
 * Copyright (c) 2015 Apple Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_LICENSE_HEADER_END@
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/event.h>
#include <sys/stat.h>
#include <sys/types.h>

int
main(int argc, char *argv[])
{
	int kq = kqueue();
	struct kevent kev;
	struct stat sb;

	if (argc != 2) {
		fprintf(stderr, "usage: %s <object on mount point>\n", argv[0]);
		exit(EXIT_FAILURE);
	}

	EV_SET(&kev, 0, EVFILT_FS, EV_ADD, 0, 0, 0);

	if (kevent(kq, &kev, 1, NULL, 0, NULL) == -1) {
		fprintf(stderr, "adding EVFILT_FS to kqueue failed: %s\n",
				strerror(errno));
		exit(EXIT_FAILURE);
	}

	if (stat(argv[1], &sb) == 0) {
		exit(EXIT_SUCCESS);
	}

	for (;;) {
		kevent(kq, NULL, 0, &kev, 1, NULL);
		if (stat(argv[1], &sb) == 0) {
			break;
		}
	}

	exit(EXIT_SUCCESS);
}