nptl/tst-sem8.c

   1 /* Copyright (C) 2003 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <semaphore.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26
  27
  28 static void
  29 remove_sem (int status, void *arg)
  30 {
  31   sem_unlink (arg);
  32 }
  33
  34
  35 int
  36 main (void)
  37 {
  38   sem_t *s;
  39   int i;
  40
  41   on_exit (remove_sem, (void *) "/glibc-tst-sem8");
  42
  43   for (i = 0; i < 3; ++i)
  44     {
  45       s = sem_open ("/glibc-tst-sem8", O_CREAT, 0600, 1);
  46       if (s == SEM_FAILED)
  47         {
  48           if (errno == ENOSYS)
  49             {
  50               puts ("sem_open not supported.  Oh well.");
  51               return 0;
  52             }
  53
  54           /* Maybe the shm filesystem has strict permissions.  */
  55           if (errno == EACCES)
  56             {
  57               puts ("sem_open not allowed.  Oh well.");
  58               return 0;
  59             }
  60
  61           printf ("sem_open: %m\n");
  62           return 1;
  63         }
  64
  65       /* Now close the handle.  */
  66       if (sem_close (s) != 0)
  67         {
  68           puts ("sem_close failed");
  69           return 1;
  70         }
  71     }
  72
  73   return 0;
  74 }