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/* Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _SYS_SEM_H
#define _SYS_SEM_H
#include <features.h>
#include <sys/types.h>
/* Get common definition of System V style IPC. */
#include <sys/ipc.h>
/* Get system dependent definition of `struct semid_ds' and more. */
#include <sys/sem_buf.h>
__BEGIN_DECLS
/* The following System V style IPC functions implement a semaphore
handling. The definition is found in XPG2. */
/* Structure used for argument to `semop' to describe operations. */
struct sembuf
{
short int sem_num; /* semaphore number */
short int sem_op; /* semaphore operation */
short int sem_flg; /* operation flag */
};
/* Semaphore control operation. */
extern int semctl __P ((int __semid, int __semnum, int __cmd,
union semun __arg));
/* Get semaphore. */
extern int semget __P ((key_t __key, int __nsems, int __semflg));
/* Operate on semaphore. */
extern int semop __P ((int __semid, struct sembuf *__sops,
unsigned int __nsops));
__END_DECLS
#endif /* sys/sem.h */
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