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Annotation of XNU/bsd/sys/shm.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*     $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $     */
        !            23: 
        !            24: /*
        !            25:  * Copyright (c) 1994 Adam Glass
        !            26:  * All rights reserved.
        !            27:  *
        !            28:  * Redistribution and use in source and binary forms, with or without
        !            29:  * modification, are permitted provided that the following conditions
        !            30:  * are met:
        !            31:  * 1. Redistributions of source code must retain the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer.
        !            33:  * 2. Redistributions in binary form must reproduce the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer in the
        !            35:  *    documentation and/or other materials provided with the distribution.
        !            36:  * 3. All advertising materials mentioning features or use of this software
        !            37:  *    must display the following acknowledgement:
        !            38:  *      This product includes software developed by Adam Glass.
        !            39:  * 4. The name of the author may not be used to endorse or promote products
        !            40:  *    derived from this software without specific prior written permission
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            43:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            44:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            45:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            46:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            47:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            48:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            49:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            50:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            51:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            52:  */
        !            53: 
        !            54: /*
        !            55:  * As defined+described in "X/Open System Interfaces and Headers"
        !            56:  *                         Issue 4, p. XXX
        !            57:  */
        !            58: 
        !            59: #ifndef _SYS_SHM_H_
        !            60: #define _SYS_SHM_H_
        !            61: 
        !            62: #include <sys/param.h>
        !            63: #include <sys/ipc.h>
        !            64: 
        !            65: #define SHM_RDONLY  010000  /* Attach read-only (else read-write) */
        !            66: #define SHM_RND     020000  /* Round attach address to SHMLBA */
        !            67: #define SHMLBA      NBPG /* Segment low boundary address multiple */
        !            68: 
        !            69: /* "official" access mode definitions; somewhat braindead since you have
        !            70:    to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
        !            71: #define SHM_R       (IPC_R)
        !            72: #define SHM_W       (IPC_W)
        !            73: 
        !            74: 
        !            75: struct shmid_ds {
        !            76:        struct ipc_perm shm_perm;       /* operation permission structure */
        !            77:        int             shm_segsz;      /* size of segment in bytes */
        !            78:        pid_t           shm_lpid;   /* process ID of last shared memory op */
        !            79:        pid_t           shm_cpid;       /* process ID of creator */
        !            80:        short           shm_nattch;     /* number of current attaches */
        !            81:        time_t          shm_atime;      /* time of last shmat() */
        !            82:        time_t          shm_dtime;      /* time of last shmdt() */
        !            83:        time_t          shm_ctime;      /* time of last change by shmctl() */
        !            84:        void           *shm_internal;   /* sysv stupidity */
        !            85: };
        !            86: 
        !            87: #ifdef KERNEL
        !            88: 
        !            89: /*
        !            90:  * System 5 style catch-all structure for shared memory constants that
        !            91:  * might be of interest to user programs.  Do we really want/need this?
        !            92:  */
        !            93: struct shminfo {
        !            94:        int     shmmax,         /* max shared memory segment size (bytes) */
        !            95:                shmmin,         /* min shared memory segment size (bytes) */
        !            96:                shmmni,         /* max number of shared memory identifiers */
        !            97:                shmseg,         /* max shared memory segments per process */
        !            98:                shmall;         /* max amount of shared memory (pages) */
        !            99: };
        !           100: extern struct shminfo  shminfo;
        !           101: extern struct shmid_ds *shmsegs;
        !           102: 
        !           103: struct proc;
        !           104: 
        !           105: void   shmexit __P((struct proc *));
        !           106: void   shmfork __P((struct proc *, struct proc *));
        !           107: #else /* !KERNEL */
        !           108: 
        !           109: #include <sys/cdefs.h>
        !           110: 
        !           111: __BEGIN_DECLS
        !           112: int shmsys __P((int, ...));
        !           113: void *shmat  __P((int, void *, int));
        !           114: int shmget __P((key_t, int, int));
        !           115: int shmctl __P((int, int, struct shmid_ds *));
        !           116: int shmdt  __P((void *));
        !           117: __END_DECLS
        !           118: 
        !           119: #endif /* !KERNEL */
        !           120: 
        !           121: #endif /* !_SYS_SHM_H_ */

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