nptl/tst-sem9.c

   1 /* Copyright (C) 2003-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <semaphore.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26
  27 static void
  28 remove_sem (int status, void *arg)
  29 {
  30   sem_unlink (arg);
  31 }
  32
  33
  34 int
  35 main (void)
  36 {
  37   sem_t *s;
  38   int i;
  39
  40   on_exit (remove_sem, (void *) "/glibc-tst-sem9");
  41
  42   for (i = 0; i < 3; ++i)
  43     {
  44       s = sem_open ("/glibc-tst-sem9", O_CREAT, 0600, 1);
  45       if (s == SEM_FAILED)
  46         {
  47           if (errno == ENOSYS)
  48             {
  49               puts ("sem_open not supported.  Oh well.");
  50               return 0;
  51             }
  52
  53           /* Maybe the shm filesystem has strict permissions.  */
  54           if (errno == EACCES)
  55             {
  56               puts ("sem_open not allowed.  Oh well.");
  57               return 0;
  58             }
  59
  60           printf ("sem_open: %m\n");
  61           return 1;
  62         }
  63
  64       /* Now close the handle.  */
  65       if (sem_close (s) != 0)
  66         {
  67           puts ("sem_close failed");
  68           return 1;
  69         }
  70
  71       /* And remove it.  */
  72       if (sem_unlink ("/glibc-tst-sem9") != 0)
  73         {
  74           puts ("sem_unlink failed");
  75           return 1;
  76         }
  77     }
  78
  79   return 0;
  80 }