1 /* $FreeBSD: src/sys/sys/shm.h,v 1.14 1999/12/29 04:24:46 peter Exp $ */ 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 typedef unsigned int shmatt_t; 54 55 struct shmid_ds { 56 struct ipc_perm shm_perm; /* operation permission structure */ 57 size_t shm_segsz; /* size of segment in bytes */ 58 pid_t shm_lpid; /* process ID of last shared memory op */ 59 pid_t shm_cpid; /* process ID of creator */ 60 shmatt_t shm_nattch; /* number of current attaches */ 61 time_t shm_atime; /* time of last shmat() */ 62 time_t shm_dtime; /* time of last shmdt() */ 63 time_t shm_ctime; /* time of last change by shmctl() */ 64 void *shm_internal; /* sysv stupidity */ 65 }; 66 67 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 68 69 /* 70 * System 5 style catch-all structure for shared memory constants that 71 * might be of interest to user programs. Do we really want/need this? 72 */ 73 struct shminfo { 74 long shmmax, /* max shared memory segment size (bytes) */ 75 shmmin, /* min shared memory segment size (bytes) */ 76 shmmni, /* max number of shared memory identifiers */ 77 shmseg, /* max shared memory segments per process */ 78 shmall; /* max amount of shared memory (pages) */ 79 }; 80 81 #endif 82 83 #ifdef _KERNEL 84 85 extern struct shminfo shminfo; 86 87 struct proc; 88 struct vmspace; 89 90 void shmexit (struct vmspace *); 91 void shmfork (struct proc *, struct proc *); 92 93 #else /* !_KERNEL */ 94 95 #include <sys/cdefs.h> 96 97 __BEGIN_DECLS 98 int shmsys (int, ...); 99 void *shmat (int, const void *, int); 100 int shmget (key_t, size_t, int); 101 int shmctl (int, int, struct shmid_ds *); 102 int shmdt (const void *); 103 __END_DECLS 104 105 #endif /* !_KERNEL */ 106 107 #endif /* !_SYS_SHM_H_ */ 108