nptl/tst-sem7.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
  42   s = sem_open ("/glibc-tst-sem7", O_CREAT, 0600, 1);
  43   if (s == SEM_FAILED)
  44     {
  45       if (errno == ENOSYS)
  46         {
  47           puts ("sem_open not supported.  Oh well.");
  48           return 0;
  49         }
  50
  51       /* Maybe the shm filesystem has strict permissions.  */
  52       if (errno == EACCES)
  53         {
  54           puts ("sem_open not allowed.  Oh well.");
  55           return 0;
  56         }
  57
  58       printf ("sem_open: %m\n");
  59       return 1;
  60     }
  61
  62   on_exit (remove_sem, (void *) "/glibc-tst-sem7");
  63
  64   /* We have the semaphore object.  Now try again.  We should get the
  65      same address.  */
  66   s2 = sem_open ("/glibc-tst-sem7", O_CREAT, 0600, 1);
  67   if (s2 == SEM_FAILED)
  68     {
  69       puts ("2nd sem_open failed");
  70       return 1;
  71     }
  72   if (s != s2)
  73     {
  74       puts ("2nd sem_open didn't return the same address");
  75       return 1;
  76     }
  77
  78   /* And again, this time without O_CREAT.  */
  79   s3 = sem_open ("/glibc-tst-sem7", 0);
  80   if (s3 == SEM_FAILED)
  81     {
  82       puts ("3rd sem_open failed");
  83       return 1;
  84     }
  85   if (s != s3)
  86     {
  87       puts ("3rd sem_open didn't return the same address");
  88       return 1;
  89     }
  90
  91   /* Now close the handle.  Three times.  */
  92   if (sem_close (s2) != 0)
  93     {
  94       puts ("1st sem_close failed");
  95       return 1;
  96     }
  97   if (sem_close (s) != 0)
  98     {
  99       puts ("2nd sem_close failed");
 100       return 1;
 101     }
 102   if (sem_close (s3) != 0)
 103     {
 104       puts ("3rd sem_close failed");
 105       return 1;
 106     }
 107
 108   return 0;
 109 }