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glibc  2.9
tst-sem8.c
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00001 /* Copyright (C) 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <fcntl.h>
00022 #include <semaphore.h>
00023 #include <stdio.h>
00024 #include <stdlib.h>
00025 #include <unistd.h>
00026 
00027 
00028 static void
00029 remove_sem (int status, void *arg)
00030 {
00031   sem_unlink (arg);
00032 }
00033 
00034 
00035 int
00036 main (void)
00037 {
00038   sem_t *s;
00039   int i;
00040 
00041   on_exit (remove_sem, (void *) "/glibc-tst-sem8");
00042 
00043   for (i = 0; i < 3; ++i)
00044     {
00045       s = sem_open ("/glibc-tst-sem8", O_CREAT, 0600, 1);
00046       if (s == SEM_FAILED)
00047        {
00048          if (errno == ENOSYS)
00049            {
00050              puts ("sem_open not supported.  Oh well.");
00051              return 0;
00052            }
00053 
00054          /* Maybe the shm filesystem has strict permissions.  */
00055          if (errno == EACCES)
00056            {
00057              puts ("sem_open not allowed.  Oh well.");
00058              return 0;
00059            }
00060 
00061          printf ("sem_open: %m\n");
00062          return 1;
00063        }
00064 
00065       /* Now close the handle.  */
00066       if (sem_close (s) != 0)
00067        {
00068          puts ("sem_close failed");
00069          return 1;
00070        }
00071     }
00072 
00073   return 0;
00074 }