1  /* Copyright (C) 2010-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library.  If not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #ifndef _SEMAPHORE_H
      19  # error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
      20  #endif
      21  
      22  
      23  #define __SIZEOF_SEM_T	16
      24  
      25  
      26  /* Value returned if `sem_open' failed.  */
      27  #define SEM_FAILED      ((sem_t *) 0)
      28  
      29  
      30  typedef union
      31  {
      32    char __size[__SIZEOF_SEM_T];
      33    long int __align __attribute__ ((__aligned__ (4)));
      34  } sem_t;