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Text File | 1992-09-04 | 3.6 KB | 95 lines | [TEXT/UNIX] |
- /*
- * Copyright (c) 1988 University of Utah.
- * Copyright (c) 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * the Systems Programming Group of the University of Utah Computer
- * Science Department.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)shm.h 7.2 (Berkeley) 2/5/91
- */
-
- /*
- * SVID compatible shm.h file
- */
- #ifndef _SHM_H_
- #define _SHM_H_
-
- #ifdef KERNEL
- #include "ipc.h"
- #else
- #include <sys/ipc.h>
- #endif
-
- struct shmid_ds {
- struct ipc_perm shm_perm; /* operation perms */
- int shm_segsz; /* size of segment (bytes) */
- ushort shm_cpid; /* pid, creator */
- ushort shm_lpid; /* pid, last operation */
- short shm_nattch; /* no. of current attaches */
- time_t shm_atime; /* last attach time */
- time_t shm_dtime; /* last detach time */
- time_t shm_ctime; /* last change time */
- void *shm_handle; /* internal handle for shm segment */
- };
-
- /*
- * System 5 style catch-all structure for shared memory constants that
- * might be of interest to user programs. Do we really want/need this?
- */
- struct shminfo {
- int shmmax; /* max shared memory segment size (bytes) */
- int shmmin; /* min shared memory segment size (bytes) */
- int shmmni; /* max number of shared memory identifiers */
- int shmseg; /* max shared memory segments per process */
- int shmall; /* max amount of shared memory (pages) */
- };
-
- /* internal "mode" bits */
- #define SHM_ALLOC 01000 /* segment is allocated */
- #define SHM_DEST 02000 /* segment will be destroyed on last detach */
-
- /* SVID required constants (same values as system 5) */
- #define SHM_RDONLY 010000 /* read-only access */
- #define SHM_RND 020000 /* round attach address to SHMLBA boundary */
-
- /* implementation constants */
- #define SHMLBA CLBYTES /* segment low boundary address multiple */
- #define SHMMMNI 512 /* maximum value for shminfo.shmmni */
-
- #ifdef KERNEL
- struct shmid_ds *shmsegs;
- struct shminfo shminfo;
- #endif
-
- #endif /* !_SHM_H_ */
-