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shm.h
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shm.h
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/* $Id: shm.h,v 1.12 1998/02/01 20:08:37 bde Exp $ */
/* $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $ */
/*
* 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/ipc.h>
#define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
#define SHM_RND 020000 /* Round attach address to SHMLBA */
#define SHMLBA PAGE_SIZE /* Segment low boundary address multiple */
/* "official" access mode definitions; somewhat braindead since you have
to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
#define SHM_R (IPC_R)
#define SHM_W (IPC_W)
struct shmid_ds {
struct ipc_perm shm_perm; /* operation permission structure */
int shm_segsz; /* size of segment in bytes */
pid_t shm_lpid; /* process ID of last shared memory op */
pid_t shm_cpid; /* process ID of creator */
short shm_nattch; /* number of current attaches */
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() */
void *shm_internal; /* sysv stupidity */
};
#ifdef KERNEL
/*
* 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 {
int shmmax, /* max shared memory segment size (bytes) */
shmmin, /* min shared memory segment size (bytes) */
shmmni, /* max number of shared memory identifiers */
shmseg, /* max shared memory segments per process */
shmall; /* max amount of shared memory (pages) */
};
extern struct shminfo shminfo;
extern struct shmid_ds *shmsegs;
struct proc;
void shmexit __P((struct proc *));
void shmfork __P((struct proc *, struct proc *));
#else /* !KERNEL */
#include <sys/cdefs.h>
__BEGIN_DECLS
int shmsys __P((int, ...));
void *shmat __P((int, void *, int));
int shmget __P((key_t, int, int));
int shmctl __P((int, int, struct shmid_ds *));
int shmdt __P((void *));
__END_DECLS
#endif /* !KERNEL */
#endif /* !_SYS_SHM_H_ */