149 lines
5.7 KiB
C
149 lines
5.7 KiB
C
/* $NetBSD: shm.h,v 1.48 2009/01/19 19:39:41 christos Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1994 Adam Glass
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Adam Glass.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* As defined+described in "X/Open System Interfaces and Headers"
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* Issue 4, p. XXX
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*/
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#ifndef _SYS_SHM_H_
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#define _SYS_SHM_H_
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#include <sys/cdefs.h>
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#include <sys/featuretest.h>
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#include <sys/ipc.h>
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#define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
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#define SHM_RND 020000 /* Round attach address to SHMLBA */
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/* Segment low boundry address multiple */
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#define SHMLBA getpagesize()
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#define SHMMNI 4096
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#define SHMSEG 32 /* max shared segs per process */
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typedef unsigned int shmatt_t;
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struct shmid_ds {
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struct ipc_perm shm_perm; /* operation permission structure */
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size_t shm_segsz; /* size of segment in bytes */
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time_t shm_atime; /* time of last shmat() */
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time_t shm_dtime; /* time of last shmdt() */
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time_t shm_ctime; /* time of last change by shmctl() */
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pid_t shm_cpid; /* process ID of creator */
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pid_t shm_lpid; /* process ID of last shm operation */
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shmatt_t shm_nattch; /* number of current attaches */
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};
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/* shm_mode upper byte flags */
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#define SHM_DEST 01000 /* segment will be destroyed on last detach */
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#define SHM_LOCKED 02000 /* segment will not be swapped */
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/* ipcs ctl commands */
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#define SHM_STAT 13
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#define SHM_INFO 14
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#if defined(_NETBSD_SOURCE) || defined(__minix)
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/*
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* Permission definitions used in shmflag arguments to shmat(2) and shmget(2).
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* Provided for source compatibility only; do not use in new code!
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*/
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#define SHM_R 0400
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#define SHM_W 0200
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/*
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* System 5 style catch-all structure for shared memory constants that
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* might be of interest to user programs. Do we really want/need this?
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*/
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struct shminfo {
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unsigned long int shmmax; /* max shared memory segment size (bytes) */
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unsigned long int shmmin; /* min shared memory segment size (bytes) */
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unsigned long int shmmni; /* max number of shared memory identifiers */
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unsigned long int shmseg; /* max shared memory segments per process */
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unsigned long int shmall; /* max amount of shared memory (pages) */
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};
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#ifdef __minix
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struct shm_info
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{
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int used_ids;
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unsigned long int shm_tot; /* total allocated shm */
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unsigned long int shm_rss; /* total resident shm */
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unsigned long int shm_swp; /* total swapped shm */
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unsigned long int swap_attempts;
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unsigned long int swap_successes;
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};
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#endif /* __minix */
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#endif /* _NETBSD_SOURCE */
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__BEGIN_DECLS
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void *shmat(int, const void *, int);
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int shmctl(int, int, struct shmid_ds *) __RENAME(__shmctl50);
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int shmdt(const void *);
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int shmget(key_t, size_t, int);
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__END_DECLS
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#endif /* !_SYS_SHM_H_ */
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