FreeBSD/Linux Kernel Cross Reference
sys/bsd/sys/shm.h

     /*
      * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*      $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $     */
    
    /*
     * Copyright (c) 1994 Adam Glass
     * All rights reserved.
     *
     * 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 Adam Glass.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
     */
    
    /*
     * As defined+described in "X/Open System Interfaces and Headers"
     *                         Issue 4, p. XXX
     */
    
    #ifndef _SYS_SHM_H_
    #define _SYS_SHM_H_
    
    #include <sys/appleapiopts.h>
    #include <sys/param.h>
    #include <sys/ipc.h>
    
    #define SHM_RDONLY  010000  /* Attach read-only (else read-write) */
    #define SHM_RND     020000  /* Round attach address to SHMLBA */
    #define SHMLBA      NBPG /* Segment low boundary address multiple */
    
    /* "official" access mode definitions; somewhat braindead since you have
       to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
    #define SHM_R       (IPC_R)
    #define SHM_W       (IPC_W)
    
    
    struct shmid_ds {
            struct ipc_perm shm_perm;       /* operation permission structure */
            int             shm_segsz;      /* size of segment in bytes */
            pid_t           shm_lpid;   /* process ID of last shared memory op */
            pid_t           shm_cpid;       /* process ID of creator */
            short           shm_nattch;     /* number of current attaches */
            time_t          shm_atime;      /* time of last shmat() */
            time_t          shm_dtime;      /* time of last shmdt() */
            time_t          shm_ctime;      /* time of last change by shmctl() */
            void           *shm_internal;   /* sysv stupidity */
    };
    
    #ifdef KERNEL
    #ifdef __APPLE_API_PRIVATE
    /*
     * 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) */
                    shmmin,         /* min shared memory segment size (bytes) */
                   shmmni,         /* max number of shared memory identifiers */
                   shmseg,         /* max shared memory segments per process */
                   shmall;         /* max amount of shared memory (pages) */
   };
   extern struct shminfo   shminfo;
   extern struct shmid_ds  *shmsegs;
   
   struct proc;
   
   void    shmexit __P((struct proc *));
   void    shmfork __P((struct proc *, struct proc *));
   __private_extern__ void shmexec __P((struct proc *));
   #endif /* __APPLE_API_PRIVATE */
   #else /* !KERNEL */
   
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   int shmsys __P((int, ...));
   void *shmat  __P((int, void *, int));
   int shmget __P((key_t, int, int));
   int shmctl __P((int, int, struct shmid_ds *));
   int shmdt  __P((void *));
   __END_DECLS
   
   #endif /* !KERNEL */
   
   #endif /* !_SYS_SHM_H_ */

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