minix/nbsd_include/sys/sem.h

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2011-02-21 14:13:55 +01:00
/* $NetBSD: sem.h,v 1.29 2009/01/19 19:39:41 christos Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* SVID compatible sem.h file
*
* Author: Daniel Boulet
*/
#ifndef _SYS_SEM_H_
#define _SYS_SEM_H_
#include <sys/featuretest.h>
#include <sys/ipc.h>
struct semid_ds {
struct ipc_perm sem_perm; /* operation permission struct */
time_t sem_otime; /* last semop() time */
unsigned long int __unused1;
time_t sem_ctime; /* last time changed by semctl() */
unsigned long int __unused2;
unsigned long int sem_nsems; /* number of semaphores in set */
unsigned long int __unused3;
unsigned long int __unused4;
};
/*
* semop's sops parameter structure
*/
struct sembuf {
unsigned short sem_num; /* semaphore # */
short sem_op; /* semaphore operation */
short sem_flg; /* operation flags */
};
#define SEM_UNDO 0x1000 /* undo changes on process exit */
/*
* commands for semctl
*/
#define GETPID 11 /* get sempid */
#define GETVAL 12 /* get semval */
#define GETALL 13 /* get all semval's */
#define GETNCNT 14 /* get semncnt */
#define GETZCNT 15 /* get semzcnt */
#define SETVAL 16 /* set semval */
#define SETALL 17 /* set all semval's */
#ifdef __USE_MISC
/* ipcs ctl cmds */
# define SEM_STAT 18
# define SEM_INFO 19
/*
* semaphore info struct
*/
struct seminfo {
int32_t semmap; /* # of entries in semaphore map */
int32_t semmni; /* # of semaphore identifiers */
int32_t semmns; /* # of semaphores in system */
int32_t semmnu; /* # of undo structures in system */
int32_t semmsl; /* max # of semaphores per id */
int32_t semopm; /* max # of operations per semop call */
int32_t semume; /* max # of undo entries per process */
int32_t semusz; /* size in bytes of undo structure */
int32_t semvmx; /* semaphore maximum value */
int32_t semaem; /* adjust on exit max value */
};
#endif /* __USE_MISC */
/*
* Configuration parameters
*/
#define SEMMNI 128
#define SEMMSL 250
#define SEMMNS (SEMMSL*SEMMNI)
#define SEMOPM 32
#define SEMVMX 32767
#include <sys/cdefs.h>
__BEGIN_DECLS
int semctl(int, int, int, ...);
int semget(key_t, int, int);
int semop(int, struct sembuf *, size_t);
__END_DECLS
#endif /* !_SYS_SEM_H_ */