The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/ipc.h

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    1 /*      $NetBSD: ipc.h,v 1.26 2003/08/07 16:34:05 agc Exp $     */
    2 
    3 /*
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * This code is derived from software contributed to Berkeley by
   13  * the Systems Programming Group of the University of Utah Computer
   14  * Science Department.
   15  *
   16  * Redistribution and use in source and binary forms, with or without
   17  * modification, are permitted provided that the following conditions
   18  * are met:
   19  * 1. Redistributions of source code must retain the above copyright
   20  *    notice, this list of conditions and the following disclaimer.
   21  * 2. Redistributions in binary form must reproduce the above copyright
   22  *    notice, this list of conditions and the following disclaimer in the
   23  *    documentation and/or other materials provided with the distribution.
   24  * 3. Neither the name of the University nor the names of its contributors
   25  *    may be used to endorse or promote products derived from this software
   26  *    without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   38  * SUCH DAMAGE.
   39  *
   40  *      @(#)ipc.h       8.4 (Berkeley) 2/19/95
   41  */
   42 
   43 /*
   44  * Copyright (c) 1988 University of Utah.
   45  *
   46  * This code is derived from software contributed to Berkeley by
   47  * the Systems Programming Group of the University of Utah Computer
   48  * Science Department.
   49  *
   50  * Redistribution and use in source and binary forms, with or without
   51  * modification, are permitted provided that the following conditions
   52  * are met:
   53  * 1. Redistributions of source code must retain the above copyright
   54  *    notice, this list of conditions and the following disclaimer.
   55  * 2. Redistributions in binary form must reproduce the above copyright
   56  *    notice, this list of conditions and the following disclaimer in the
   57  *    documentation and/or other materials provided with the distribution.
   58  * 3. All advertising materials mentioning features or use of this software
   59  *    must display the following acknowledgement:
   60  *      This product includes software developed by the University of
   61  *      California, Berkeley and its contributors.
   62  * 4. Neither the name of the University nor the names of its contributors
   63  *    may be used to endorse or promote products derived from this software
   64  *    without specific prior written permission.
   65  *
   66  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   67  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   68  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   69  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   70  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   71  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   72  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   73  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   74  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   75  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   76  * SUCH DAMAGE.
   77  *
   78  *      @(#)ipc.h       8.4 (Berkeley) 2/19/95
   79  */
   80 
   81 /*
   82  * SVID compatible ipc.h file
   83  */
   84 
   85 #ifndef _SYS_IPC_H_
   86 #define _SYS_IPC_H_
   87 
   88 #include <sys/featuretest.h>
   89 #include <sys/types.h>
   90 
   91 struct ipc_perm {
   92         uid_t           uid;    /* user id */
   93         gid_t           gid;    /* group id */
   94         uid_t           cuid;   /* creator user id */
   95         gid_t           cgid;   /* creator group id */
   96         mode_t          mode;   /* r/w permission */
   97 
   98         /*
   99          * These members are private and used only in the internal
  100          * implementation of this interface.
  101          */
  102         unsigned short  _seq;   /* sequence # (to generate unique
  103                                    msg/sem/shm id) */
  104         key_t           _key;   /* user specified msg/sem/shm key */
  105 };
  106 
  107 #if defined(_NETBSD_SOURCE)
  108 /* Warning: 64-bit structure padding is needed here */
  109 struct ipc_perm_sysctl {
  110         u_int64_t       _key;
  111         uid_t           uid;
  112         gid_t           gid;
  113         uid_t           cuid;
  114         gid_t           cgid;
  115         mode_t          mode;
  116         int16_t         _seq;
  117         int16_t         pad;
  118 };
  119 #endif /* _NETBSD_SOURCE */
  120 
  121 #ifdef _KERNEL
  122 /*
  123  * Old IPC permission structure used before NetBSD 1.5.
  124  */
  125 struct ipc_perm14 {
  126         unsigned short  cuid;   /* creator user id */
  127         unsigned short  cgid;   /* creator group id */
  128         unsigned short  uid;    /* user id */
  129         unsigned short  gid;    /* group id */
  130         unsigned short  mode;   /* r/w permission */
  131         unsigned short  seq;    /* sequence # (to generate unique
  132                                    msg/sem/shm id) */
  133         key_t   key;            /* user specified msg/sem/shm key */
  134 };
  135 #endif /* _KERNEL */
  136 
  137 /* Common access type bits, used with ipcperm(). */
  138 #define IPC_R           000400  /* read permission */
  139 #define IPC_W           000200  /* write/alter permission */
  140 #define IPC_M           010000  /* permission to change control info */
  141 
  142 /* X/Open required constants (same values as system 5) */
  143 #define IPC_CREAT       001000  /* create entry if key does not exist */
  144 #define IPC_EXCL        002000  /* fail if key exists */
  145 #define IPC_NOWAIT      004000  /* error if request must wait */
  146 
  147 #define IPC_PRIVATE     (key_t)0 /* private key */
  148 
  149 #define IPC_RMID        0       /* remove identifier */
  150 #define IPC_SET         1       /* set options */
  151 #define IPC_STAT        2       /* get options */
  152 
  153 /*
  154  * Macros to convert between ipc ids and array indices or sequence ids.
  155  * The first of these is used by ipcs(1), and so is defined outside the
  156  * kernel as well.
  157  */
  158 #if defined(_NETBSD_SOURCE)
  159 #define IXSEQ_TO_IPCID(ix,perm) (((perm._seq) << 16) | (ix & 0xffff))
  160 #endif
  161 
  162 #ifdef _KERNEL
  163 #define IPCID_TO_IX(id)         ((id) & 0xffff)
  164 #define IPCID_TO_SEQ(id)        (((id) >> 16) & 0xffff)
  165 
  166 int     ipcperm __P((struct ucred *, struct ipc_perm *, int));
  167 
  168 void    ipc_perm14_to_native __P((struct ipc_perm14 *, struct ipc_perm *));
  169 void    native_to_ipc_perm14 __P((struct ipc_perm *, struct ipc_perm14 *));
  170 #endif /* _KERNEL */
  171 
  172 #ifndef _KERNEL
  173 #include <sys/cdefs.h>
  174 
  175 __BEGIN_DECLS
  176 key_t   ftok __P((const char *, int));
  177 __END_DECLS
  178 #endif
  179 #endif /* !_SYS_IPC_H_ */

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