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66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
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/* Copyright (C) 1995 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
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not, 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_BUF_H
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#define _SYS_SEM_BUF_H
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#include <features.h>
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#include <sys/types.h>
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/* Flags for `semop'. */
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#define SEM_UNDO 0x1000 /* undo the operation on exit */
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/* Commands for `semctl'. */
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#define GETPID 11 /* get sempid */
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#define GETVAL 12 /* get semval */
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#define GETALL 13 /* get all semval's */
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#define GETNCNT 14 /* get semncnt */
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#define GETZCNT 15 /* get semzcnt */
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#define SETVAL 16 /* set semval */
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#define SETALL 17 /* set all semval's */
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__BEGIN_DECLS
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/* Data structure describing a set of semaphores. */
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struct semid_ds
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{
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struct ipc_perm sem_perm; /* operation permisson struct */
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__time_t sem_otime; /* last semop() time */
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__time_t sem_ctime; /* last time changed by semctl() */
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struct sem *__sembase; /* ptr to first semaphore in array */
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struct sem_queue *__sem_pending; /* pending operations */
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struct sem_queue *__sem_pending_last; /* last pending operation */
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struct sem_undo *__undo; /* ondo requests on this array */
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unsigned short int sem_nsems; /* number of semaphores in set */
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};
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/* Union used for argument for `semctl'. */
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union semun
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{
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int val; /* value for SETVAL */
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struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
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unsigned short int *array; /* array for GETALL & SETALL */
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struct seminfo *__buf; /* buffer for IPC_INFO */
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};
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__END_DECLS
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#endif /* sys/sem_buf.h */
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