FreeBSD/Linux Kernel Cross Reference
sys/sys/shm.h
1 /* $FreeBSD: releng/7.3/sys/sys/shm.h 196006 2009-07-31 20:32:55Z jhb $ */
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/cdefs.h>
43 #include <sys/ipc.h>
44 #include <sys/_types.h>
45
46 #define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
47 #define SHM_RND 020000 /* Round attach address to SHMLBA */
48 #define SHMLBA PAGE_SIZE /* Segment low boundary address multiple */
49
50 /* "official" access mode definitions; somewhat braindead since you have
51 to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
52 #define SHM_R (IPC_R)
53 #define SHM_W (IPC_W)
54
55 /* predefine tbd *LOCK shmctl commands */
56 #define SHM_LOCK 11
57 #define SHM_UNLOCK 12
58
59 /* ipcs shmctl commands */
60 #define SHM_STAT 13
61 #define SHM_INFO 14
62
63 #ifndef _PID_T_DECLARED
64 typedef __pid_t pid_t;
65 #define _PID_T_DECLARED
66 #endif
67
68 #ifndef _TIME_T_DECLARED
69 typedef __time_t time_t;
70 #define _TIME_T_DECLARED
71 #endif
72
73 #ifndef _SIZE_T_DECLARED
74 typedef __size_t size_t;
75 #define _SIZE_T_DECLARED
76 #endif
77
78 #if defined(_KERNEL)
79 struct shmid_ds_old {
80 struct ipc_perm_old shm_perm; /* operation permission structure */
81 int shm_segsz; /* size of segment in bytes */
82 pid_t shm_lpid; /* process ID of last shared memory op */
83 pid_t shm_cpid; /* process ID of creator */
84 short shm_nattch; /* number of current attaches */
85 time_t shm_atime; /* time of last shmat() */
86 time_t shm_dtime; /* time of last shmdt() */
87 time_t shm_ctime; /* time of last change by shmctl() */
88 void *shm_internal; /* sysv stupidity */
89 };
90 #endif
91
92 struct shmid_ds {
93 struct ipc_perm shm_perm; /* operation permission structure */
94 size_t shm_segsz; /* size of segment in bytes */
95 pid_t shm_lpid; /* process ID of last shared memory op */
96 pid_t shm_cpid; /* process ID of creator */
97 int shm_nattch; /* number of current attaches */
98 time_t shm_atime; /* time of last shmat() */
99 time_t shm_dtime; /* time of last shmdt() */
100 time_t shm_ctime; /* time of last change by shmctl() */
101 };
102
103 #ifdef _KERNEL
104 #include <vm/vm.h>
105
106 /*
107 * System 5 style catch-all structure for shared memory constants that
108 * might be of interest to user programs. Do we really want/need this?
109 */
110 struct shminfo {
111 u_long shmmax; /* max shared memory segment size (bytes) */
112 u_long shmmin; /* max shared memory segment size (bytes) */
113 u_long shmmni; /* max number of shared memory identifiers */
114 u_long shmseg; /* max shared memory segments per process */
115 u_long shmall; /* max amount of shared memory (pages) */
116 };
117
118 /*
119 * Add a kernel wrapper to the shmid_ds struct so that private info (like the
120 * MAC label) can be added to it, without changing the user interface.
121 */
122 struct shmid_kernel {
123 struct shmid_ds u;
124 vm_object_t object;
125 struct label *label; /* MAC label */
126 };
127
128 extern struct shminfo shminfo;
129
130 struct shm_info {
131 int used_ids;
132 unsigned long shm_tot;
133 unsigned long shm_rss;
134 unsigned long shm_swp;
135 unsigned long swap_attempts;
136 unsigned long swap_successes;
137 };
138
139 struct thread;
140 struct proc;
141 struct vmspace;
142
143 void shmexit(struct vmspace *);
144 void shmfork(struct proc *, struct proc *);
145 #else /* !_KERNEL */
146
147 #include <sys/cdefs.h>
148
149 #ifndef _SIZE_T_DECLARED
150 typedef __size_t size_t;
151 #define _SIZE_T_DECLARED
152 #endif
153
154 __BEGIN_DECLS
155 int shmsys(int, ...);
156 void *shmat(int, const void *, int);
157 int shmget(key_t, size_t, int);
158 int shmctl(int, int, struct shmid_ds *);
159 int shmdt(const void *);
160 __END_DECLS
161
162 #endif /* !_KERNEL */
163
164 #endif /* !_SYS_SHM_H_ */
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