FreeBSD/Linux Kernel Cross Reference
sys/sys/shm.h
1 /* $FreeBSD: releng/11.0/sys/sys/shm.h 301074 2016-05-31 19:24:32Z ed $ */
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 #include <machine/param.h>
47
48 #define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
49 #define SHM_RND 020000 /* Round attach address to SHMLBA */
50 #define SHMLBA PAGE_SIZE /* Segment low boundary address multiple */
51
52 /* "official" access mode definitions; somewhat braindead since you have
53 to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
54 #define SHM_R (IPC_R)
55 #define SHM_W (IPC_W)
56
57 /* predefine tbd *LOCK shmctl commands */
58 #define SHM_LOCK 11
59 #define SHM_UNLOCK 12
60
61 /* ipcs shmctl commands for Linux compatibility */
62 #define SHM_STAT 13
63 #define SHM_INFO 14
64
65 #ifndef _PID_T_DECLARED
66 typedef __pid_t pid_t;
67 #define _PID_T_DECLARED
68 #endif
69
70 #ifndef _TIME_T_DECLARED
71 typedef __time_t time_t;
72 #define _TIME_T_DECLARED
73 #endif
74
75 #ifndef _SIZE_T_DECLARED
76 typedef __size_t size_t;
77 #define _SIZE_T_DECLARED
78 #endif
79
80 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
81 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
82 struct shmid_ds_old {
83 struct ipc_perm_old shm_perm; /* operation permission structure */
84 int shm_segsz; /* size of segment in bytes */
85 pid_t shm_lpid; /* process ID of last shared memory op */
86 pid_t shm_cpid; /* process ID of creator */
87 short shm_nattch; /* number of current attaches */
88 time_t shm_atime; /* time of last shmat() */
89 time_t shm_dtime; /* time of last shmdt() */
90 time_t shm_ctime; /* time of last change by shmctl() */
91 void *shm_internal; /* sysv stupidity */
92 };
93 #endif
94
95 struct shmid_ds {
96 struct ipc_perm shm_perm; /* operation permission structure */
97 size_t shm_segsz; /* size of segment in bytes */
98 pid_t shm_lpid; /* process ID of last shared memory op */
99 pid_t shm_cpid; /* process ID of creator */
100 int shm_nattch; /* number of current attaches */
101 time_t shm_atime; /* time of last shmat() */
102 time_t shm_dtime; /* time of last shmdt() */
103 time_t shm_ctime; /* time of last change by shmctl() */
104 };
105
106 #ifdef _KERNEL
107 #include <vm/vm.h>
108
109 /*
110 * System 5 style catch-all structure for shared memory constants that
111 * might be of interest to user programs. Do we really want/need this?
112 */
113 struct shminfo {
114 u_long shmmax; /* max shared memory segment size (bytes) */
115 u_long shmmin; /* max shared memory segment size (bytes) */
116 u_long shmmni; /* max number of shared memory identifiers */
117 u_long shmseg; /* max shared memory segments per process */
118 u_long shmall; /* max amount of shared memory (pages) */
119 };
120
121 /*
122 * Add a kernel wrapper to the shmid_ds struct so that private info (like the
123 * MAC label) can be added to it, without changing the user interface.
124 */
125 struct shmid_kernel {
126 struct shmid_ds u;
127 vm_object_t object;
128 struct label *label; /* MAC label */
129 struct ucred *cred; /* creator's credendials */
130 };
131
132 extern struct shminfo shminfo;
133
134 struct shm_info {
135 int used_ids;
136 unsigned long shm_tot;
137 unsigned long shm_rss;
138 unsigned long shm_swp;
139 unsigned long swap_attempts;
140 unsigned long swap_successes;
141 };
142
143 struct thread;
144 struct proc;
145 struct vmspace;
146
147 void shmexit(struct vmspace *);
148 void shmfork(struct proc *, struct proc *);
149 #endif /* _KERNEL */
150
151 #if !defined(_KERNEL) || defined(_WANT_SHM_PROTOTYPES)
152 #include <sys/cdefs.h>
153
154 #ifndef _SIZE_T_DECLARED
155 typedef __size_t size_t;
156 #define _SIZE_T_DECLARED
157 #endif
158
159 __BEGIN_DECLS
160 #ifdef __BSD_VISIBLE
161 int shmsys(int, ...);
162 #endif
163 void *shmat(int, const void *, int);
164 int shmget(key_t, size_t, int);
165 int shmctl(int, int, struct shmid_ds *);
166 int shmdt(const void *);
167 __END_DECLS
168
169 #endif /* _KERNEL || _WANT_SHM_PROTOTYPES */
170
171 #endif /* !_SYS_SHM_H_ */
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