| 1 | /* $FreeBSD: src/sys/sys/shm.h,v 1.19 2003/01/25 21:33:05 alfred Exp $ */
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| 2 | /* $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $ */
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| 3 |
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| 4 | /*
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| 5 | * Copyright (c) 1994 Adam Glass
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| 6 | * All rights reserved.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by Adam Glass.
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| 19 | * 4. The name of the author may not be used to endorse or promote products
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| 20 | * derived from this software without specific prior written permission
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 23 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 24 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 25 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 26 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 27 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 28 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 29 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 30 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 31 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 32 | */
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| 33 |
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| 34 | /*
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| 35 | * As defined+described in "X/Open System Interfaces and Headers"
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| 36 | * Issue 4, p. XXX
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| 37 | */
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| 38 |
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| 39 | #ifndef _SYS_SHM_H_
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| 40 | #define _SYS_SHM_H_
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| 41 |
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| 42 | #include <sys/ipc.h>
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| 43 |
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| 44 | #define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
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| 45 | #define SHM_RND 020000 /* Round attach address to SHMLBA */
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| 46 | #define SHMLBA PAGE_SIZE /* Segment low boundary address multiple */
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| 47 |
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| 48 | /* "official" access mode definitions; somewhat braindead since you have
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| 49 | to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
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| 50 | #define SHM_R (IPC_R)
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| 51 | #define SHM_W (IPC_W)
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| 52 |
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| 53 | /* predefine tbd *LOCK shmctl commands */
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| 54 | #define SHM_LOCK 11
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| 55 | #define SHM_UNLOCK 12
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| 56 |
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| 57 | /* ipcs shmctl commands */
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| 58 | #define SHM_STAT 13
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| 59 | #define SHM_INFO 14
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| 60 |
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| 61 | struct shmid_ds {
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| 62 | struct ipc_perm shm_perm; /* operation permission structure */
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| 63 | int shm_segsz; /* size of segment in bytes */
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| 64 | pid_t shm_lpid; /* process ID of last shared memory op */
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| 65 | pid_t shm_cpid; /* process ID of creator */
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| 66 | short shm_nattch; /* number of current attaches */
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| 67 | time_t shm_atime; /* time of last shmat() */
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| 68 | time_t shm_dtime; /* time of last shmdt() */
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| 69 | time_t shm_ctime; /* time of last change by shmctl() */
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| 70 | void *shm_internal; /* sysv stupidity */
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| 71 | };
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| 72 |
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| 73 | #ifdef _KERNEL
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| 74 |
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| 75 | /*
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| 76 | * System 5 style catch-all structure for shared memory constants that
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| 77 | * might be of interest to user programs. Do we really want/need this?
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| 78 | */
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| 79 | struct shminfo {
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| 80 | int shmmax, /* max shared memory segment size (bytes) */
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| 81 | shmmin, /* min shared memory segment size (bytes) */
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| 82 | shmmni, /* max number of shared memory identifiers */
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| 83 | shmseg, /* max shared memory segments per process */
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| 84 | shmall; /* max amount of shared memory (pages) */
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| 85 | };
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| 86 | extern struct shminfo shminfo;
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| 87 | extern struct shmid_ds *shmsegs;
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| 88 |
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| 89 | struct shm_info {
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| 90 | int used_ids;
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| 91 | unsigned long shm_tot;
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| 92 | unsigned long shm_rss;
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| 93 | unsigned long shm_swp;
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| 94 | unsigned long swap_attempts;
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| 95 | unsigned long swap_successes;
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| 96 | };
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| 97 |
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| 98 | struct thread;
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| 99 | struct proc;
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| 100 | struct vmspace;
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| 101 |
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| 102 | void shmexit(struct vmspace *);
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| 103 | void shmfork(struct proc *, struct proc *);
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| 104 | #else /* !_KERNEL */
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| 105 |
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| 106 | #include <sys/cdefs.h>
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| 107 |
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| 108 | #ifndef _SIZE_T_DECLARED
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| 109 | typedef __size_t size_t;
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| 110 | #define _SIZE_T_DECLARED
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| 111 | #endif
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| 112 |
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| 113 | __BEGIN_DECLS
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| 114 | int shmsys(int, ...);
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| 115 | void *shmat(int, const void *, int);
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| 116 | int shmget(key_t, size_t, int);
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| 117 | int shmctl(int, int, struct shmid_ds *);
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| 118 | int shmdt(const void *);
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| 119 | __END_DECLS
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| 120 |
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| 121 | #endif /* !_KERNEL */
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| 122 |
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| 123 | #endif /* !_SYS_SHM_H_ */
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