1 /* $FreeBSD: src/sys/sys/shm.h,v 1.14 1999/12/29 04:24:46 peter Exp $ */ 2 /* $DragonFly: src/sys/sys/shm.h,v 1.5 2003/08/27 02:03:22 dillon Exp $ */ 3 /* $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $ */ 4 5 /* 6 * Copyright (c) 1994 Adam Glass 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Adam Glass. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * As defined+described in "X/Open System Interfaces and Headers" 37 * Issue 4, p. XXX 38 */ 39 40 #ifndef _SYS_SHM_H_ 41 #define _SYS_SHM_H_ 42 43 #include <sys/ipc.h> 44 45 #define SHM_RDONLY 010000 /* Attach read-only (else read-write) */ 46 #define SHM_RND 020000 /* Round attach address to SHMLBA */ 47 #define SHMLBA PAGE_SIZE /* Segment low boundary address multiple */ 48 49 /* "official" access mode definitions; somewhat braindead since you have 50 to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */ 51 #define SHM_R (IPC_R) 52 #define SHM_W (IPC_W) 53 54 55 struct shmid_ds { 56 struct ipc_perm shm_perm; /* operation permission structure */ 57 int 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 short 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 int 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 extern struct shmid_ds *shmsegs; 87 88 struct proc; 89 struct vmspace; 90 91 void shmexit (struct vmspace *); 92 void shmfork (struct proc *, struct proc *); 93 94 #else /* !_KERNEL */ 95 96 #include <sys/cdefs.h> 97 98 __BEGIN_DECLS 99 int shmsys (int, ...); 100 void *shmat (int, void *, int); 101 int shmget (key_t, int, int); 102 int shmctl (int, int, struct shmid_ds *); 103 int shmdt (void *); 104 __END_DECLS 105 106 #endif /* !_KERNEL */ 107 108 #endif /* !_SYS_SHM_H_ */ 109