124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $ */
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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/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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#define SHMLBA PAGE_SIZE /* Segment low boundary address multiple */
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/* "official" access mode definitions; somewhat braindead since you have
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to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
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#define SHM_R (IPC_R)
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#define SHM_W (IPC_W)
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/* predefine tbd *LOCK shmctl commands */
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#define SHM_LOCK 11
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#define SHM_UNLOCK 12
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/* ipcs shmctl commands */
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#define SHM_STAT 13
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#define SHM_INFO 14
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struct shmid_ds {
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struct ipc_perm shm_perm; /* operation permission structure */
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int shm_segsz; /* size of segment in bytes */
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pid_t shm_lpid; /* process ID of last shared memory op */
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pid_t shm_cpid; /* process ID of creator */
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short shm_nattch; /* number of current attaches */
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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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void *shm_internal; /* sysv stupidity */
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};
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#ifdef _KERNEL
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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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int shmmax, /* max shared memory segment size (bytes) */
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shmmin, /* min shared memory segment size (bytes) */
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shmmni, /* max number of shared memory identifiers */
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shmseg, /* max shared memory segments per process */
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shmall; /* max amount of shared memory (pages) */
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};
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extern struct shminfo shminfo;
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extern struct shmid_ds *shmsegs;
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struct shm_info {
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int used_ids;
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unsigned long shm_tot;
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unsigned long shm_rss;
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unsigned long shm_swp;
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unsigned long swap_attempts;
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unsigned long swap_successes;
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};
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struct thread;
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struct proc;
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struct vmspace;
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void shmexit(struct vmspace *);
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void shmfork(struct proc *, struct proc *);
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#else /* !_KERNEL */
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#include <sys/cdefs.h>
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#ifndef _SIZE_T_DECLARED
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typedef __size_t size_t;
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#define _SIZE_T_DECLARED
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#endif
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__BEGIN_DECLS
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int shmsys(int, ...);
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void *shmat(int, const void *, int);
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int shmget(key_t, size_t, int);
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int shmctl(int, int, struct shmid_ds *);
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int shmdt(const void *);
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__END_DECLS
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#endif /* !_KERNEL */
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#endif /* !_SYS_SHM_H_ */
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