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   sem_t *s2;
  40   sem_t *s3;
  41   int i;
  42
  43   on_exit (remove_sem, (void *) "/glibc-tst-sem8");
  44
  45   for (i = 0; i < 3; ++i)
  46     {
  47       s = sem_open ("/glibc-tst-sem8", O_CREAT, 0600, 1);
  48       if (s == SEM_FAILED)
  49         {
  50           if (errno == ENOSYS)
  51             {
  52               puts ("sem_open not supported.  Oh well.");
  53               return 0;
  54             }
  55
  56           /* Maybe the shm filesystem has strict permissions.  */
  57           if (errno == EACCES)
  58             {
  59               puts ("sem_open not allowed.  Oh well.");
  60               return 0;
  61             }
  62
  63           printf ("sem_open: %m\n");
  64           return 1;
  65         }
  66
  67       /* Now close the handle.  */
  68       if (sem_close (s) != 0)
  69         {
  70           puts ("sem_close failed");
  71           return 1;
  72         }
  73     }
  74
  75   return 0;
  76 }