199 lines
7.2 KiB
C
199 lines
7.2 KiB
C
/* $NetBSD: shm.h,v 1.42 2006/11/25 21:40:06 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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* 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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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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#ifdef _KERNEL
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#define _SHM_RMLINGER 040000 /* Attach even if segment removed */
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#endif
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/* Segment low boundry address multiple */
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#if defined(_KERNEL) || defined(_STANDALONE) || defined(_LKM)
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#define SHMLBA PAGE_SIZE
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#else
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/*
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* SHMLBA uses libc's internal __sysconf() to retrieve the machine's
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* page size. The value of _SC_PAGESIZE is 28 -- we hard code it so we do not
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* need to include unistd.h
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*/
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__BEGIN_DECLS
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long __sysconf(int);
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__END_DECLS
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#define SHMLBA (__sysconf(28))
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#endif
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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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pid_t shm_lpid; /* process ID of last shm operation */
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pid_t shm_cpid; /* process ID of creator */
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shmatt_t 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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/*
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* These members are private and used only in the internal
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* implementation of this interface.
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*/
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void *_shm_internal;
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};
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#if defined(_NETBSD_SOURCE)
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/*
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* Some systems (e.g. HP-UX) take these as the second (cmd) arg to shmctl().
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*/
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#define SHM_LOCK 3 /* Lock segment in memory. */
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#define SHM_UNLOCK 4 /* Unlock a segment locked by SHM_LOCK. */
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#endif /* _NETBSD_SOURCE */
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#if defined(_NETBSD_SOURCE)
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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 IPC_R /* S_IRUSR, R for owner */
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#define SHM_W IPC_W /* S_IWUSR, W for owner */
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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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int32_t shmmax; /* max shared memory segment size (bytes) */
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int32_t shmmin; /* min shared memory segment size (bytes) */
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int32_t shmmni; /* max number of shared memory identifiers */
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int32_t shmseg; /* max shared memory segments per process */
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int32_t shmall; /* max amount of shared memory (pages) */
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};
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/* Warning: 64-bit structure padding is needed here */
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struct shmid_ds_sysctl {
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struct ipc_perm_sysctl shm_perm;
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uint64_t shm_segsz;
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pid_t shm_lpid;
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pid_t shm_cpid;
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time_t shm_atime;
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time_t shm_dtime;
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time_t shm_ctime;
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uint32_t shm_nattch;
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};
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struct shm_sysctl_info {
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struct shminfo shminfo;
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int32_t pad; /* shminfo not a multiple of 64 bits */
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struct shmid_ds_sysctl shmids[1];
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};
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#endif /* _NETBSD_SOURCE */
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#ifdef _KERNEL
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extern struct shminfo shminfo;
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extern struct shmid_ds *shmsegs;
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extern int shm_nused;
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#define SHMSEG_FREE 0x0200
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#define SHMSEG_REMOVED 0x0400
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#define SHMSEG_ALLOCATED 0x0800
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#define SHMSEG_WANTED 0x1000
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#define SHMSEG_RMLINGER 0x2000
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#define SHMSEG_WIRED 0x4000
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struct vmspace;
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void shminit(void);
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void shmfork(struct vmspace *, struct vmspace *);
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void shmexit(struct vmspace *);
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int shmctl1(struct lwp *, int, int, struct shmid_ds *);
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#else /* !_KERNEL */
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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(__shmctl13);
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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 /* !_KERNEL */
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#endif /* !_SYS_SHM_H_ */
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