152 lines
4.9 KiB
C
152 lines
4.9 KiB
C
/* $OpenBSD: shm.h,v 1.30 2021/03/10 10:21:47 jsg Exp $ */
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/* $NetBSD: shm.h,v 1.20 1996/04/09 20:55:35 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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#ifndef _SYS_IPC_H_
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#include <sys/ipc.h>
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#endif
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#if __BSD_VISIBLE
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/* shm-specific sysctl variables corresponding to members of struct shminfo */
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#define KERN_SHMINFO_SHMMAX 1 /* int: max shm segment size (bytes) */
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#define KERN_SHMINFO_SHMMIN 2 /* int: min shm segment size (bytes) */
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#define KERN_SHMINFO_SHMMNI 3 /* int: max number of shm identifiers */
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#define KERN_SHMINFO_SHMSEG 4 /* int: max shm segments per process */
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#define KERN_SHMINFO_SHMALL 5 /* int: max amount of shm (pages) */
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#define KERN_SHMINFO_MAXID 6 /* number of valid shared memory ids */
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#define CTL_KERN_SHMINFO_NAMES { \
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{ 0, 0 }, \
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{ "shmmax", CTLTYPE_INT }, \
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{ "shmmin", CTLTYPE_INT }, \
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{ "shmmni", CTLTYPE_INT }, \
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{ "shmseg", CTLTYPE_INT }, \
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{ "shmall", CTLTYPE_INT }, \
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}
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/*
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* Old (deprecated) access mode definitions--do not use.
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* Provided for compatibility with old code only.
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*/
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#define SHM_R IPC_R
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#define SHM_W IPC_W
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#endif /* __BSD_VISIBLE */
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/*
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* Shared memory operation flags for shmat(2).
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*/
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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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/*
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* Shared memory specific control commands for shmctl().
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* We accept but ignore these (XXX).
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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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/*
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* Segment low boundary address multiple
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*/
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#define SHMLBA (1U << _MAX_PAGE_SHIFT)
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typedef short 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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int shm_segsz; /* size of segment in bytes */
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pid_t shm_lpid; /* process ID of last shm op */
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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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long __shm_atimensec;
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time_t shm_dtime; /* time of last shmdt() */
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long __shm_dtimensec;
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time_t shm_ctime; /* time of last change by shmctl() */
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long __shm_ctimensec;
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void *shm_internal; /* implementation specific data */
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};
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#if __BSD_VISIBLE
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/*
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* System V 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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int shmmin; /* min shared memory segment size (bytes) */
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int shmmni; /* max number of shared memory identifiers */
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int shmseg; /* max shared memory segments per process */
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int shmall; /* max amount of shared memory (pages) */
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};
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struct shm_sysctl_info {
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struct shminfo shminfo;
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struct shmid_ds shmids[1];
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};
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#endif /* __BSD_VISIBLE */
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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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struct proc;
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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 sysctl_sysvshm(int *, u_int, void *, size_t *, void *, size_t);
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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 *);
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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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