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  * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
  61  * support for mandatory and extensible security protections.  This notice
  62  * is included in support of clause 2.2 (b) of the Apple Public License,
  63  * Version 2.0.
  64  */
  65
  66 /*
  67  * As defined+described in "X/Open System Interfaces and Headers"
  68  *                         Issue 4, p. XXX
  69  */
  70
  71 #ifndef _SYS_SHM_INTERNALH_
  72 #define _SYS_SHM_INTERNALH_
  73
  74 #include <sys/shm.h>
  75 #include <sys/cdefs.h>
  76
  77 #include <machine/types.h>
  78
  79 #if __DARWIN_ALIGN_NATURAL
  80 #pragma options align=natural
  81 #endif
  82
  83 struct user_shmid_ds {
  84         struct ipc_perm shm_perm;       /* operation permission structure */
  85         user_size_t     shm_segsz;      /* size of segment in bytes */
  86         pid_t           shm_lpid;       /* PID of last shared memory op */
  87         pid_t           shm_cpid;       /* PID of creator */
  88         short           shm_nattch;     /* number of current attaches */
  89         time_t          shm_atime;      /* time of last shmat() */
  90         time_t          shm_dtime;      /* time of last shmdt() */
  91         time_t          shm_ctime;      /* time of last change by shmctl() */
  92         user_addr_t     shm_internal;   /* reserved for kernel use */
  93 };
  94
  95 #if __DARWIN_ALIGN_NATURAL
  96 #pragma options align=reset
  97 #endif
  98
  99 /*
 100  * System 5 style catch-all structure for shared memory constants that
 101  * might be of interest to user programs.  Also part of the ipcs interface.
 102  * Note: use of user_ssize_t intentional: permits 32 bit ipcs to provide
 103  * information about 64 bit programs shared segments.
 104  * Note 2: user_ssize_t is not that useful if it's not 64-bit,
 105  * so let's use int64_t explicitely...
 106  */
 107 struct shminfo {
 108         int64_t shmmax;         /* max shm segment size (bytes) */
 109         int64_t shmmin;         /* min shm segment size (bytes) */
 110         int64_t shmmni;         /* max number of shm identifiers */
 111         int64_t shmseg;         /* max shm segments per process */
 112         int64_t shmall;         /* max amount of shm (pages) */
 113 };
 114
 115 #ifdef KERNEL
 116
 117 struct label;
 118
 119 /*
 120  * Add a kernel wrapper to the shmid_ds struct so that private info (like the
 121  * MAC label) can be added to it, without changing the user interface.
 122  */
 123 struct shmid_kernel {
 124         struct user_shmid_ds u;
 125         struct label *label;    /* MAC label */
 126 };
 127
 128 extern struct shminfo shminfo;
 129 extern struct shmid_kernel *shmsegs;
 130
 131 struct proc;
 132
 133 __BEGIN_DECLS
 134
 135 void    shmexit(struct proc *);
 136 int     shmfork(struct proc *, struct proc *);
 137 __private_extern__ void shmexec(struct proc *);
 138
 139 __END_DECLS
 140
 141 #endif /* kernel */
 142
 143 #endif /* !_SYS_SHM_INTERNALH_ */