/* 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; sem_t *s2; sem_t *s3; s = sem_open ("/glibc-tst-sem7", 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; } on_exit (remove_sem, (void *) "/glibc-tst-sem7"); /* We have the semaphore object. Now try again. We should get the same address. */ s2 = sem_open ("/glibc-tst-sem7", O_CREAT, 0600, 1); if (s2 == SEM_FAILED) { puts ("2nd sem_open failed"); return 1; } if (s != s2) { puts ("2nd sem_open didn't return the same address"); return 1; } /* And again, this time without O_CREAT. */ s3 = sem_open ("/glibc-tst-sem7", 0); if (s3 == SEM_FAILED) { puts ("3rd sem_open failed"); return 1; } if (s != s3) { puts ("3rd sem_open didn't return the same address"); return 1; } /* Now close the handle. Three times. */ if (sem_close (s2) != 0) { puts ("1st sem_close failed"); return 1; } if (sem_close (s) != 0) { puts ("2nd sem_close failed"); return 1; } if (sem_close (s3) != 0) { puts ("3rd sem_close failed"); return 1; } return 0; }