shm.h revision 9444
1/* $Id: shm.h,v 1.3 1994/10/02 17:24:54 phk 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 CLBYTES /* Segment low boundry 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 54struct shmid_ds { 55 struct ipc_perm shm_perm; /* operation permission structure */ 56 int shm_segsz; /* size of segment in bytes */ 57 pid_t shm_lpid; /* process ID of last shared memory op */ 58 pid_t shm_cpid; /* process ID of creator */ 59 short shm_nattch; /* number of current attaches */ 60 time_t shm_atime; /* time of last shmat() */ 61 time_t shm_dtime; /* time of last shmdt() */ 62 time_t shm_ctime; /* time of last change by shmctl() */ 63 void *shm_internal; /* sysv stupidity */ 64}; 65 66#ifdef KERNEL 67 68/* 69 * System 5 style catch-all structure for shared memory constants that 70 * might be of interest to user programs. Do we really want/need this? 71 */ 72struct shminfo { 73 int shmmax, /* max shared memory segment size (bytes) */ 74 shmmin, /* min shared memory segment size (bytes) */ 75 shmmni, /* max number of shared memory identifiers */ 76 shmseg, /* max shared memory segments per process */ 77 shmall; /* max amount of shared memory (pages) */ 78}; 79extern struct shminfo shminfo; 80struct shmid_ds *shmsegs; 81 82void shminit __P((void)); 83void shmexit __P((struct proc *)); 84void shmfork __P((struct proc *, struct proc *, int)); 85#else /* !KERNEL */ 86 87#include <sys/cdefs.h> 88 89__BEGIN_DECLS 90int shmsys __P((int, ...)); 91void *shmat __P((int, void *, int)); 92int shmget __P((key_t, int, int)); 93int shmctl __P((int, int, struct shmid_ds *)); 94int shmdt __P((void *)); 95__END_DECLS 96 97#endif /* !KERNEL */ 98 99#endif /* !_SYS_SHM_H_ */ 100