support/wait4path.c

   1 /*
   2  * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_APACHE_LICENSE_HEADER_START@
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * @APPLE_APACHE_LICENSE_HEADER_END@
  19  */
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <sys/event.h>
  23 #include <sys/time.h>
  24 #include <sys/param.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <string.h>
  30
  31 int main(int argc, char *argv[])
  32 {
  33         int kq = kqueue();
  34         struct kevent kev;
  35         struct stat sb;
  36
  37         if (argc != 2) {
  38                 fprintf(stderr, "usage: %s <object on mount point>\n", argv[0]);
  39                 exit(EXIT_FAILURE);
  40         }
  41
  42         EV_SET(&kev, 0, EVFILT_FS, EV_ADD, 0, 0, 0);
  43
  44         if (kevent(kq, &kev, 1, NULL, 0, NULL) == -1) {
  45                 fprintf(stderr, "adding EVFILT_FS to kqueue failed: %s\n", strerror(errno));
  46                 exit(EXIT_FAILURE);
  47         }
  48
  49         if (stat(argv[1], &sb) == 0) {
  50                 exit(EXIT_SUCCESS);
  51         }
  52
  53         for (;;) {
  54                 kevent(kq, NULL, 0, &kev, 1, NULL);
  55                 if (stat(argv[1], &sb) == 0) {
  56                         break;
  57                 }
  58         }
  59
  60         exit(EXIT_SUCCESS);
  61 }