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/cdefs.h> 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 #if __BSD_VISIBLE 50 /* "official" access mode definitions; somewhat braindead since you have 51 to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */ 52 #define SHM_R (IPC_R) 53 #define SHM_W (IPC_W) 54 #endif 55 56 typedef unsigned int shmatt_t; 57 58 #ifndef _PID_T_DECLARED 59 typedef __pid_t pid_t; 60 #define _PID_T_DECLARED 61 #endif 62 63 #ifndef _SIZE_T_DECLARED 64 typedef __size_t size_t; 65 #define _SIZE_T_DECLARED 66 #endif 67 68 #ifndef _TIME_T_DECLARED 69 typedef __time_t time_t; 70 #define _TIME_T_DECLARED 71 #endif 72 73 struct shmid_ds { 74 struct ipc_perm shm_perm; /* operation permission structure */ 75 size_t shm_segsz; /* size of segment in bytes */ 76 pid_t shm_lpid; /* process ID of last shared memory op */ 77 pid_t shm_cpid; /* process ID of creator */ 78 shmatt_t shm_nattch; /* number of current attaches */ 79 time_t shm_atime; /* time of last shmat() */ 80 time_t shm_dtime; /* time of last shmdt() */ 81 time_t shm_ctime; /* time of last change by shmctl() */ 82 void *shm_internal; /* sysv stupidity */ 83 }; 84 85 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 86 87 /* 88 * System 5 style catch-all structure for shared memory constants that 89 * might be of interest to user programs. Do we really want/need this? 90 */ 91 struct shminfo { 92 long shmmax, /* max shared memory segment size (bytes) */ 93 shmmin, /* min shared memory segment size (bytes) */ 94 shmmni, /* max number of shared memory identifiers */ 95 shmseg, /* max shared memory segments per process */ 96 shmall; /* max amount of shared memory (pages) */ 97 }; 98 99 #endif 100 101 #ifdef _KERNEL 102 103 extern struct shminfo shminfo; 104 105 struct proc; 106 struct vmspace; 107 108 void shmexit(struct vmspace *); 109 void shmfork(struct proc *, struct proc *); 110 111 #else /* !_KERNEL */ 112 113 __BEGIN_DECLS 114 int shmget(key_t, size_t, int); 115 int shmctl(int, int, struct shmid_ds *); 116 void *shmat(int, const void *, int); 117 int shmdt(const void *); 118 __END_DECLS 119 120 #endif /* !_KERNEL */ 121 122 #endif /* !_SYS_SHM_H_ */ 123