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