minix/include/sys/shm.h

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/* $NetBSD: shm.h,v 1.48 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.
*/
/*
* Copyright (c) 1994 Adam Glass
* All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Adam Glass.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* As defined+described in "X/Open System Interfaces and Headers"
* Issue 4, p. XXX
*/
#ifndef _SYS_SHM_H_
#define _SYS_SHM_H_
#include <sys/cdefs.h>
#include <sys/featuretest.h>
#include <sys/ipc.h>
#define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
#define SHM_RND 020000 /* Round attach address to SHMLBA */
/* Segment low boundry address multiple */
#define SHMLBA getpagesize()
#define SHMMNI 4096
#define SHMSEG 32 /* max shared segs per process */
typedef unsigned int shmatt_t;
struct shmid_ds {
struct ipc_perm shm_perm; /* operation permission structure */
size_t shm_segsz; /* size of segment in bytes */
time_t shm_atime; /* time of last shmat() */
time_t shm_dtime; /* time of last shmdt() */
time_t shm_ctime; /* time of last change by shmctl() */
pid_t shm_cpid; /* process ID of creator */
pid_t shm_lpid; /* process ID of last shm operation */
shmatt_t shm_nattch; /* number of current attaches */
};
/* shm_mode upper byte flags */
#define SHM_DEST 01000 /* segment will be destroyed on last detach */
#define SHM_LOCKED 02000 /* segment will not be swapped */
/* ipcs ctl commands */
#define SHM_STAT 13
#define SHM_INFO 14
#if defined(_NETBSD_SOURCE) || defined(__minix)
/*
* Permission definitions used in shmflag arguments to shmat(2) and shmget(2).
* Provided for source compatibility only; do not use in new code!
*/
#define SHM_R 0400
#define SHM_W 0200
/*
* System 5 style catch-all structure for shared memory constants that
* might be of interest to user programs. Do we really want/need this?
*/
struct shminfo {
unsigned long int shmmax; /* max shared memory segment size (bytes) */
unsigned long int shmmin; /* min shared memory segment size (bytes) */
unsigned long int shmmni; /* max number of shared memory identifiers */
unsigned long int shmseg; /* max shared memory segments per process */
unsigned long int shmall; /* max amount of shared memory (pages) */
};
#ifdef __minix
struct shm_info
{
int used_ids;
unsigned long int shm_tot; /* total allocated shm */
unsigned long int shm_rss; /* total resident shm */
unsigned long int shm_swp; /* total swapped shm */
unsigned long int swap_attempts;
unsigned long int swap_successes;
};
#endif /* __minix */
#endif /* _NETBSD_SOURCE */
__BEGIN_DECLS
void *shmat(int, const void *, int);
int shmctl(int, int, struct shmid_ds *) __RENAME(__shmctl50);
int shmdt(const void *);
int shmget(key_t, size_t, int);
__END_DECLS
#endif /* !_SYS_SHM_H_ */