wait4path/wait4path.c

   1 /*
   2  * Copyright (c) 2015 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <errno.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/event.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31
  32 int
  33 main(int argc, char *argv[])
  34 {
  35         int kq = kqueue();
  36         struct kevent kev;
  37         struct stat sb;
  38
  39         if (argc != 2) {
  40                 fprintf(stderr, "usage: %s <object on mount point>\n", argv[0]);
  41                 exit(EXIT_FAILURE);
  42         }
  43
  44         EV_SET(&kev, 0, EVFILT_FS, EV_ADD, 0, 0, 0);
  45
  46         if (kevent(kq, &kev, 1, NULL, 0, NULL) == -1) {
  47                 fprintf(stderr, "adding EVFILT_FS to kqueue failed: %s\n",
  48                                 strerror(errno));
  49                 exit(EXIT_FAILURE);
  50         }
  51
  52         if (stat(argv[1], &sb) == 0) {
  53                 exit(EXIT_SUCCESS);
  54         }
  55
  56         for (;;) {
  57                 kevent(kq, NULL, 0, &kev, 1, NULL);
  58                 if (stat(argv[1], &sb) == 0) {
  59                         break;
  60                 }
  61         }
  62
  63         exit(EXIT_SUCCESS);
  64 }