kernel - shmid_ds structure needs to change on 64-bit :-(
[dragonfly.git] / sys / sys / shm.h
CommitLineData
984263bc 1/* $FreeBSD: src/sys/sys/shm.h,v 1.14 1999/12/29 04:24:46 peter Exp $ */
4abcbc58 2/* $DragonFly: src/sys/sys/shm.h,v 1.6 2006/09/30 20:03:44 swildner Exp $ */
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3/* $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $ */
4
5/*
6 * Copyright (c) 1994 Adam Glass
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by Adam Glass.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35/*
36 * As defined+described in "X/Open System Interfaces and Headers"
37 * Issue 4, p. XXX
38 */
39
40#ifndef _SYS_SHM_H_
41#define _SYS_SHM_H_
42
43#include <sys/ipc.h>
44
45#define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
46#define SHM_RND 020000 /* Round attach address to SHMLBA */
47#define SHMLBA PAGE_SIZE /* Segment low boundary address multiple */
48
49/* "official" access mode definitions; somewhat braindead since you have
50 to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
51#define SHM_R (IPC_R)
52#define SHM_W (IPC_W)
53
54
55struct shmid_ds {
56 struct ipc_perm shm_perm; /* operation permission structure */
7849af9f 57 size_t shm_segsz; /* size of segment in bytes */
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58 pid_t shm_lpid; /* process ID of last shared memory op */
59 pid_t shm_cpid; /* process ID of creator */
7849af9f 60 int shm_nattch; /* number of current attaches */
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61 time_t shm_atime; /* time of last shmat() */
62 time_t shm_dtime; /* time of last shmdt() */
63 time_t shm_ctime; /* time of last change by shmctl() */
64 void *shm_internal; /* sysv stupidity */
65};
66
ec12abe0 67#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
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68
69/*
70 * System 5 style catch-all structure for shared memory constants that
71 * might be of interest to user programs. Do we really want/need this?
72 */
73struct shminfo {
7849af9f 74 long shmmax, /* max shared memory segment size (bytes) */
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75 shmmin, /* min shared memory segment size (bytes) */
76 shmmni, /* max number of shared memory identifiers */
77 shmseg, /* max shared memory segments per process */
78 shmall; /* max amount of shared memory (pages) */
79};
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80
81#endif
82
83#ifdef _KERNEL
84
984263bc 85extern struct shminfo shminfo;
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86
87struct proc;
fef0fdf2 88struct vmspace;
984263bc 89
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90void shmexit (struct vmspace *);
91void shmfork (struct proc *, struct proc *);
ec12abe0 92
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93#else /* !_KERNEL */
94
95#include <sys/cdefs.h>
96
97__BEGIN_DECLS
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98int shmsys (int, ...);
99void *shmat (int, void *, int);
100int shmget (key_t, int, int);
101int shmctl (int, int, struct shmid_ds *);
102int shmdt (void *);
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103__END_DECLS
104
105#endif /* !_KERNEL */
106
107#endif /* !_SYS_SHM_H_ */