FreeBSD/Linux Kernel Cross Reference
sys/sys/shm.h
1 /* $FreeBSD: releng/5.3/sys/sys/shm.h 136588 2004-10-16 08:43:07Z cvs2svn $ */
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 /* predefine tbd *LOCK shmctl commands */
54 #define SHM_LOCK 11
55 #define SHM_UNLOCK 12
56
57 /* ipcs shmctl commands */
58 #define SHM_STAT 13
59 #define SHM_INFO 14
60
61 struct shmid_ds {
62 struct ipc_perm shm_perm; /* operation permission structure */
63 int shm_segsz; /* size of segment in bytes */
64 pid_t shm_lpid; /* process ID of last shared memory op */
65 pid_t shm_cpid; /* process ID of creator */
66 short shm_nattch; /* number of current attaches */
67 time_t shm_atime; /* time of last shmat() */
68 time_t shm_dtime; /* time of last shmdt() */
69 time_t shm_ctime; /* time of last change by shmctl() */
70 void *shm_internal; /* sysv stupidity */
71 };
72
73 #ifdef _KERNEL
74
75 /*
76 * System 5 style catch-all structure for shared memory constants that
77 * might be of interest to user programs. Do we really want/need this?
78 */
79 struct shminfo {
80 int shmmax, /* max shared memory segment size (bytes) */
81 shmmin, /* min shared memory segment size (bytes) */
82 shmmni, /* max number of shared memory identifiers */
83 shmseg, /* max shared memory segments per process */
84 shmall; /* max amount of shared memory (pages) */
85 };
86 extern struct shminfo shminfo;
87 extern struct shmid_ds *shmsegs;
88
89 struct shm_info {
90 int used_ids;
91 unsigned long shm_tot;
92 unsigned long shm_rss;
93 unsigned long shm_swp;
94 unsigned long swap_attempts;
95 unsigned long swap_successes;
96 };
97
98 struct thread;
99 struct proc;
100 struct vmspace;
101
102 void shmexit(struct vmspace *);
103 void shmfork(struct proc *, struct proc *);
104 #else /* !_KERNEL */
105
106 #include <sys/cdefs.h>
107
108 #ifndef _SIZE_T_DECLARED
109 typedef __size_t size_t;
110 #define _SIZE_T_DECLARED
111 #endif
112
113 __BEGIN_DECLS
114 int shmsys(int, ...);
115 void *shmat(int, const void *, int);
116 int shmget(key_t, size_t, int);
117 int shmctl(int, int, struct shmid_ds *);
118 int shmdt(const void *);
119 __END_DECLS
120
121 #endif /* !_KERNEL */
122
123 #endif /* !_SYS_SHM_H_ */
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