master
1/*
2 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/* $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $ */
29
30/*
31 * Copyright (c) 1994 Adam Glass
32 * All rights reserved.
33 *
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
36 * are met:
37 * 1. Redistributions of source code must retain the above copyright
38 * notice, this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright
40 * notice, this list of conditions and the following disclaimer in the
41 * documentation and/or other materials provided with the distribution.
42 * 3. All advertising materials mentioning features or use of this software
43 * must display the following acknowledgement:
44 * This product includes software developed by Adam Glass.
45 * 4. The name of the author may not be used to endorse or promote products
46 * derived from this software without specific prior written permission
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
49 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
50 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
51 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
52 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
53 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
54 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
55 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
56 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
57 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
58 */
59
60/*
61 * As defined+described in "X/Open System Interfaces and Headers"
62 * Issue 4, p. XXX
63 */
64
65#ifndef _SYS_SHM_H_
66#define _SYS_SHM_H_
67
68#include <sys/cdefs.h>
69#include <sys/_types.h>
70
71/*
72 * [XSI] All of the symbols from <sys/ipc.h> SHALL be defined
73 * when this header is included
74 */
75#include <sys/ipc.h>
76
77/*
78 * [XSI] The pid_t, time_t, key_t, and size_t types shall be defined as
79 * described in <sys/types.h>.
80 *
81 * NOTE: The definition of the key_t type is implicit from the
82 * inclusion of <sys/ipc.h>
83 */
84#include <sys/_types/_pid_t.h>
85#include <sys/_types/_time_t.h>
86#include <sys/_types/_size_t.h>
87
88/*
89 * [XSI] The unsigned integer type used for the number of current attaches
90 * that MUST be able to store values at least as large as a type unsigned
91 * short.
92 */
93typedef unsigned short shmatt_t;
94
95
96/*
97 * Possible flag values which may be OR'ed into the third argument to
98 * shmat()
99 */
100#define SHM_RDONLY 010000 /* [XSI] Attach read-only (else read-write) */
101#define SHM_RND 020000 /* [XSI] Round attach address to SHMLBA */
102
103/*
104 * This value is symbolic, and generally not expected to be sed by user
105 * programs directly, although such ise is permitted by the standard. Its
106 * value in our implementation is equal to the number of bytes per page.
107 *
108 * NOTE: We DO NOT obtain this value from the appropriate system
109 * headers at this time, to avoid the resulting namespace
110 * pollution, which is why we discourages its use.
111 */
112#if __arm64__
113#define SHMLBA (16*1024) /* [XSI] Segment low boundary address multiple*/
114#else /* __arm64__ */
115#define SHMLBA 4096 /* [XSI] Segment low boundary address multiple*/
116#endif /* __arm64__ */
117
118/* "official" access mode definitions; somewhat braindead since you have
119 * to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
120#define SHM_R (IPC_R)
121#define SHM_W (IPC_W)
122
123#pragma pack(4)
124
125/*
126 * Technically, we should force all code references to the new structure
127 * definition, not in just the standards conformance case, and leave the
128 * legacy interface there for binary compatibility only. Currently, we
129 * are only forcing this for programs requesting standards conformance.
130 */
131#if __DARWIN_UNIX03 || defined(KERNEL)
132/*
133 * Structure used internally.
134 *
135 * This structure is exposed because standards dictate that it is used as
136 * the third argment to shmctl().
137 *
138 * NOTE: The field shm_internal is not meaningful in user space,
139 * and must not be used there.
140 */
141#if (defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE))
142struct shmid_ds
143#else
144#define shmid_ds __shmid_ds_new
145struct __shmid_ds_new
146#endif
147{
148 struct __ipc_perm_new shm_perm; /* [XSI] Operation permission value */
149 size_t shm_segsz; /* [XSI] Size of segment in bytes */
150 pid_t shm_lpid; /* [XSI] PID of last shared memory op */
151 pid_t shm_cpid; /* [XSI] PID of creator */
152 shmatt_t shm_nattch; /* [XSI] Number of current attaches */
153 time_t shm_atime; /* [XSI] Time of last shmat() */
154 time_t shm_dtime; /* [XSI] Time of last shmdt() */
155 time_t shm_ctime; /* [XSI] Time of last shmctl() change */
156 void *shm_internal; /* reserved for kernel use */
157};
158#else /* !__DARWIN_UNIX03 */
159#define shmid_ds __shmid_ds_old
160#endif /* !__DARWIN_UNIX03 */
161
162#if !__DARWIN_UNIX03
163struct __shmid_ds_old {
164 struct __ipc_perm_old shm_perm; /* [XSI] Operation permission value */
165 size_t shm_segsz; /* [XSI] Size of segment in bytes */
166 pid_t shm_lpid; /* [XSI] PID of last shared memory op */
167 pid_t shm_cpid; /* [XSI] PID of creator */
168 shmatt_t shm_nattch; /* [XSI] Number of current attaches */
169 time_t shm_atime; /* [XSI] Time of last shmat() */
170 time_t shm_dtime; /* [XSI] Time of last shmdt() */
171 time_t shm_ctime; /* [XSI] Time of last shmctl() change */
172 void *shm_internal; /* reserved for kernel use */
173};
174#endif /* !__DARWIN_UNIX03 */
175
176#pragma pack()
177
178
179__BEGIN_DECLS
180#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
181int shmsys(int, ...);
182#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
183void *shmat(int, const void *, int);
184int shmctl(int, int, struct shmid_ds *) __DARWIN_ALIAS(shmctl);
185int shmdt(const void *);
186int shmget(key_t, size_t, int);
187__END_DECLS
188
189
190#endif /* !_SYS_SHM_H_ */