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Annotation of Net2/sys/shm.h, revision 1.1.1.3

1.1.1.3 ! root        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:  *     from: @(#)shm.h 7.2 (Berkeley) 2/5/91
        !            39:  *     shm.h,v 1.3 1993/05/20 16:23:03 cgd Exp
        !            40:  */
        !            41: 
        !            42: #ifndef _SYS_SHM_H_
        !            43: #define _SYS_SHM_H_
        !            44: 
        !            45: /*
        !            46:  * SVID compatible shm.h file
        !            47:  */
        !            48: 
        !            49: #ifdef KERNEL
        !            50: #include "ipc.h"
        !            51: #else
        !            52: #include <sys/ipc.h>
        !            53: #endif
        !            54: 
        !            55: struct shmid_ds {
        !            56:        struct  ipc_perm shm_perm;      /* operation perms */
        !            57:        int     shm_segsz;              /* size of segment (bytes) */
        !            58:        ushort  shm_cpid;               /* pid, creator */
        !            59:        ushort  shm_lpid;               /* pid, last operation */
        !            60:        short   shm_nattch;             /* no. of current attaches */
        !            61:        time_t  shm_atime;              /* last attach time */
        !            62:        time_t  shm_dtime;              /* last detach time */
        !            63:        time_t  shm_ctime;              /* last change time */
        !            64:        void    *shm_handle;            /* internal handle for shm segment */
        !            65: };
        !            66: 
        !            67: /*
        !            68:  * System 5 style catch-all structure for shared memory constants that
        !            69:  * might be of interest to user programs.  Do we really want/need this?
        !            70:  */
        !            71: struct shminfo {
        !            72:        int     shmmax;         /* max shared memory segment size (bytes) */
        !            73:        int     shmmin;         /* min shared memory segment size (bytes) */
        !            74:        int     shmmni;         /* max number of shared memory identifiers */
        !            75:        int     shmseg;         /* max shared memory segments per process */
        !            76:        int     shmall;         /* max amount of shared memory (pages) */
        !            77: };
        !            78: 
        !            79: /* internal "mode" bits */
        !            80: #define        SHM_ALLOC       01000   /* segment is allocated */
        !            81: #define        SHM_DEST        02000   /* segment will be destroyed on last detach */
        !            82: 
        !            83: /* SVID required constants (same values as system 5) */
        !            84: #define        SHM_RDONLY      010000  /* read-only access */
        !            85: #define        SHM_RND         020000  /* round attach address to SHMLBA boundary */
        !            86: 
        !            87: /* implementation constants */
        !            88: #define        SHMLBA          CLBYTES /* segment low boundary address multiple */
        !            89: #define        SHMMMNI         512     /* maximum value for shminfo.shmmni */
        !            90: 
        !            91: #ifdef KERNEL
        !            92: struct shmid_ds        *shmsegs;
        !            93: struct shminfo         shminfo;
        !            94: #endif
        !            95: 
        !            96: #endif /* !_SYS_SHM_H_ */

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