2 /* $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $ */
5 * SPDX-License-Identifier: BSD-4-Clause
7 * Copyright (c) 1994 Adam Glass
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Adam Glass.
21 * 4. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 * As defined+described in "X/Open System Interfaces and Headers"
44 #include <sys/cdefs.h>
46 #include <sys/_types.h>
48 #include <machine/param.h>
50 #define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
51 #define SHM_RND 020000 /* Round attach address to SHMLBA */
52 #define SHMLBA PAGE_SIZE /* Segment low boundary address multiple */
54 /* "official" access mode definitions; somewhat braindead since you have
55 to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
59 /* predefine tbd *LOCK shmctl commands */
63 /* ipcs shmctl commands for Linux compatibility */
67 #ifndef _PID_T_DECLARED
68 typedef __pid_t pid_t;
69 #define _PID_T_DECLARED
72 #ifndef _TIME_T_DECLARED
73 typedef __time_t time_t;
74 #define _TIME_T_DECLARED
77 #ifndef _SIZE_T_DECLARED
78 typedef __size_t size_t;
79 #define _SIZE_T_DECLARED
82 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
83 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
85 struct ipc_perm_old shm_perm; /* operation permission structure */
86 int shm_segsz; /* size of segment in bytes */
87 pid_t shm_lpid; /* process ID of last shared memory op */
88 pid_t shm_cpid; /* process ID of creator */
89 short shm_nattch; /* number of current attaches */
90 time_t shm_atime; /* time of last shmat() */
91 time_t shm_dtime; /* time of last shmdt() */
92 time_t shm_ctime; /* time of last change by shmctl() */
93 void *shm_internal; /* sysv stupidity */
97 typedef unsigned int shmatt_t;
100 struct ipc_perm shm_perm; /* operation permission structure */
101 size_t shm_segsz; /* size of segment in bytes */
102 pid_t shm_lpid; /* process ID of last shared memory op */
103 pid_t shm_cpid; /* process ID of creator */
104 shmatt_t shm_nattch; /* number of current attaches */
105 time_t shm_atime; /* time of last shmat() */
106 time_t shm_dtime; /* time of last shmdt() */
107 time_t shm_ctime; /* time of last change by shmctl() */
114 * System 5 style catch-all structure for shared memory constants that
115 * might be of interest to user programs. Do we really want/need this?
118 u_long shmmax; /* max shared memory segment size (bytes) */
119 u_long shmmin; /* max shared memory segment size (bytes) */
120 u_long shmmni; /* max number of shared memory identifiers */
121 u_long shmseg; /* max shared memory segments per process */
122 u_long shmall; /* max amount of shared memory (pages) */
126 * Add a kernel wrapper to the shmid_ds struct so that private info (like the
127 * MAC label) can be added to it, without changing the user interface.
129 struct shmid_kernel {
132 struct label *label; /* MAC label */
133 struct ucred *cred; /* creator's credendials */
136 extern struct shminfo shminfo;
140 unsigned long shm_tot;
141 unsigned long shm_rss;
142 unsigned long shm_swp;
143 unsigned long swap_attempts;
144 unsigned long swap_successes;
151 void shmexit(struct vmspace *);
152 void shmfork(struct proc *, struct proc *);
155 #if !defined(_KERNEL) || defined(_WANT_SHM_PROTOTYPES)
156 #include <sys/cdefs.h>
158 #ifndef _SIZE_T_DECLARED
159 typedef __size_t size_t;
160 #define _SIZE_T_DECLARED
165 int shmsys(int, ...);
167 void *shmat(int, const void *, int);
168 int shmget(key_t, size_t, int);
169 int shmctl(int, int, struct shmid_ds *);
170 int shmdt(const void *);
173 #endif /* _KERNEL || _WANT_SHM_PROTOTYPES */
175 #endif /* !_SYS_SHM_H_ */