Edit: semaphore.h
/* Copyright (C) 2002-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. 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, see <http://www.gnu.org/licenses/>. */ #ifndef _SEMAPHORE_H # error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead." #endif #include <bits/wordsize.h> #if __WORDSIZE == 64 # define __SIZEOF_SEM_T 32 #else # define __SIZEOF_SEM_T 16 #endif /* Value returned if `sem_open' failed. */ #define SEM_FAILED ((sem_t *) 0) typedef union { char __size[__SIZEOF_SEM_T]; long int __align; } sem_t;
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