61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _SYS_SEM_H
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#define _SYS_SEM_H 1
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#include <features.h>
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#include <sys/types.h>
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/* Get common definition of System V style IPC. */
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#include <sys/ipc.h>
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/* Get system dependent definition of `struct semid_ds' and more. */
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#include <sys/sem_buf.h>
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__BEGIN_DECLS
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/* The following System V style IPC functions implement a semaphore
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handling. The definition is found in XPG2. */
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/* Structure used for argument to `semop' to describe operations. */
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struct sembuf
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{
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short int sem_num; /* semaphore number */
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short int sem_op; /* semaphore operation */
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short int sem_flg; /* operation flag */
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};
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/* Semaphore control operation. */
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extern int semctl __P ((int __semid, int __semnum, int __cmd,
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union semun __arg));
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/* Get semaphore. */
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extern int semget __P ((key_t __key, int __nsems, int __semflg));
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/* Operate on semaphore. */
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extern int semop __P ((int __semid, struct sembuf *__sops,
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unsigned int __nsops));
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__END_DECLS
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#endif /* _SYS_SEM_H */
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