projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| b688fc87 WJ |
1 | /* |
| 2 | * Copyright (c) 1988 University of Utah. | |
| 3 | * Copyright (c) 1990 The Regents of the University of California. | |
| 4 | * All rights reserved. | |
| 5 | * | |
| 6 | * This code is derived from software contributed to Berkeley by | |
| 7 | * the Systems Programming Group of the University of Utah Computer | |
| 8 | * Science Department. | |
| 9 | * | |
| 10 | * Redistribution and use in source and binary forms, with or without | |
| 11 | * modification, are permitted provided that the following conditions | |
| 12 | * are met: | |
| 13 | * 1. Redistributions of source code must retain the above copyright | |
| 14 | * notice, this list of conditions and the following disclaimer. | |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 16 | * notice, this list of conditions and the following disclaimer in the | |
| 17 | * documentation and/or other materials provided with the distribution. | |
| 18 | * 3. All advertising materials mentioning features or use of this software | |
| 19 | * must display the following acknowledgement: | |
| 20 | * This product includes software developed by the University of | |
| 21 | * California, Berkeley and its contributors. | |
| 22 | * 4. Neither the name of the University nor the names of its contributors | |
| 23 | * may be used to endorse or promote products derived from this software | |
| 24 | * without specific prior written permission. | |
| 25 | * | |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 36 | * SUCH DAMAGE. | |
| 37 | * | |
| 38 | * @(#)shm.h 7.2 (Berkeley) 2/5/91 | |
| 39 | */ | |
| 40 | ||
| 41 | /* | |
| 42 | * SVID compatible shm.h file | |
| 43 | */ | |
| 44 | #ifndef _SHM_H_ | |
| 45 | #define _SHM_H_ | |
| 46 | ||
| 47 | #ifdef KERNEL | |
| 48 | #include "ipc.h" | |
| 49 | #else | |
| 50 | #include <sys/ipc.h> | |
| 51 | #endif | |
| 52 | ||
| 53 | struct shmid_ds { | |
| 54 | struct ipc_perm shm_perm; /* operation perms */ | |
| 55 | int shm_segsz; /* size of segment (bytes) */ | |
| 56 | ushort shm_cpid; /* pid, creator */ | |
| 57 | ushort shm_lpid; /* pid, last operation */ | |
| 58 | short shm_nattch; /* no. of current attaches */ | |
| 59 | time_t shm_atime; /* last attach time */ | |
| 60 | time_t shm_dtime; /* last detach time */ | |
| 61 | time_t shm_ctime; /* last change time */ | |
| 62 | void *shm_handle; /* internal handle for shm segment */ | |
| 63 | }; | |
| 64 | ||
| 65 | /* | |
| 66 | * System 5 style catch-all structure for shared memory constants that | |
| 67 | * might be of interest to user programs. Do we really want/need this? | |
| 68 | */ | |
| 69 | struct shminfo { | |
| 70 | int shmmax; /* max shared memory segment size (bytes) */ | |
| 71 | int shmmin; /* min shared memory segment size (bytes) */ | |
| 72 | int shmmni; /* max number of shared memory identifiers */ | |
| 73 | int shmseg; /* max shared memory segments per process */ | |
| 74 | int shmall; /* max amount of shared memory (pages) */ | |
| 75 | }; | |
| 76 | ||
| 77 | /* internal "mode" bits */ | |
| 78 | #define SHM_ALLOC 01000 /* segment is allocated */ | |
| 79 | #define SHM_DEST 02000 /* segment will be destroyed on last detach */ | |
| 80 | ||
| 81 | /* SVID required constants (same values as system 5) */ | |
| 82 | #define SHM_RDONLY 010000 /* read-only access */ | |
| 83 | #define SHM_RND 020000 /* round attach address to SHMLBA boundary */ | |
| 84 | ||
| 85 | /* implementation constants */ | |
| 86 | #define SHMLBA CLBYTES /* segment low boundary address multiple */ | |
| 87 | #define SHMMMNI 512 /* maximum value for shminfo.shmmni */ | |
| 88 | ||
| 89 | #ifdef KERNEL | |
| 90 | struct shmid_ds *shmsegs; | |
| 91 | struct shminfo shminfo; | |
| 92 | #endif | |
| 93 | ||
| 94 | #endif /* !_SHM_H_ */ |