bsd/sys/shm_internal.h

   1 /*
   2  * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*      $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $     */
  29
  30 /*
  31  * Copyright (c) 1994 Adam Glass
  32  * All rights reserved.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  * 3. All advertising materials mentioning features or use of this software
  43  *    must display the following acknowledgement:
  44  *      This product includes software developed by Adam Glass.
  45  * 4. The name of the author may not be used to endorse or promote products
  46  *    derived from this software without specific prior written permission
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  49  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  50  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  51  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  52  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  53  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  54  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  55  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  56  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  57  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  58  */
  59
  60 /*
  61  * As defined+described in "X/Open System Interfaces and Headers"
  62  *                         Issue 4, p. XXX
  63  */
  64
  65 #ifndef _SYS_SHM_INTERNALH_
  66 #define _SYS_SHM_INTERNALH_
  67
  68 #include <sys/shm.h>
  69 #include <sys/cdefs.h>
  70
  71 #include <machine/types.h>
  72
  73 #if __DARWIN_ALIGN_NATURAL
  74 #pragma options align=natural
  75 #endif
  76
  77 struct user_shmid_ds {
  78         struct ipc_perm shm_perm;       /* operation permission structure */
  79         user_size_t     shm_segsz;      /* size of segment in bytes */
  80         pid_t           shm_lpid;       /* PID of last shared memory op */
  81         pid_t           shm_cpid;       /* PID of creator */
  82         short           shm_nattch;     /* number of current attaches */
  83         time_t          shm_atime;      /* time of last shmat() */
  84         time_t          shm_dtime;      /* time of last shmdt() */
  85         time_t          shm_ctime;      /* time of last change by shmctl() */
  86         user_addr_t     shm_internal;   /* reserved for kernel use */
  87 };
  88
  89 #if __DARWIN_ALIGN_NATURAL
  90 #pragma options align=reset
  91 #endif
  92
  93 /*
  94  * System 5 style catch-all structure for shared memory constants that
  95  * might be of interest to user programs.  Also part of the ipcs interface.
  96  * Note: use of user_ssize_t intentional: permits 32 bit ipcs to provide
  97  * information about 64 bit programs shared segments.
  98  */
  99 struct shminfo {
 100         user_ssize_t    shmmax;         /* max shm segment size (bytes) */
 101         user_ssize_t    shmmin;         /* min shm segment size (bytes) */
 102         user_ssize_t    shmmni;         /* max number of shm identifiers */
 103         user_ssize_t    shmseg;         /* max shm segments per process */
 104         user_ssize_t    shmall;         /* max amount of shm (pages) */
 105 };
 106
 107 #ifdef KERNEL
 108 extern struct shminfo shminfo;
 109 extern struct user_shmid_ds *shmsegs;
 110
 111 struct proc;
 112
 113 __BEGIN_DECLS
 114
 115 void    shmexit(struct proc *);
 116 int     shmfork(struct proc *, struct proc *);
 117 __private_extern__ void shmexec(struct proc *);
 118
 119 __END_DECLS
 120
 121 #endif /* kernel */
 122
 123 #endif /* !_SYS_SHM_INTERNALH_ */