source: vendor/glibc-tests/2005-06-14/nptl/tst-sem9.c

/* Copyright (C) 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <fcntl.h>
#include <semaphore.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>


static void
remove_sem (int status, void *arg)
{
  sem_unlink (arg);
}


int
main (void)
{
  sem_t *s;
  int i;

  on_exit (remove_sem, (void *) "/glibc-tst-sem9");

  for (i = 0; i < 3; ++i)
    {
      s = sem_open ("/glibc-tst-sem9", O_CREAT, 0600, 1);
      if (s == SEM_FAILED)
        {
          if (errno == ENOSYS)
            {
              puts ("sem_open not supported.  Oh well.");
              return 0;
            }

          /* Maybe the shm filesystem has strict permissions.  */
          if (errno == EACCES)
            {
              puts ("sem_open not allowed.  Oh well.");
              return 0;
            }

          printf ("sem_open: %m\n");
          return 1;
        }

      /* Now close the handle.  */
      if (sem_close (s) != 0)
        {
          puts ("sem_close failed");
          return 1;
        }

      /* And remove it.  */
      if (sem_unlink ("/glibc-tst-sem9") != 0)
        {
          puts ("sem_unlink failed");
          return 1;
        }
    }

  return 0;
}