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 /*-
    2  * Copyright (c) 1988 University of Utah.
    3  * Copyright (c) 1990, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  * (c) UNIX System Laboratories, Inc.
    6  * All or some portions of this file are derived from material licensed
    7  * to the University of California by American Telephone and Telegraph
    8  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    9  * the permission of UNIX System Laboratories, Inc.
   10  *
   11  * This code is derived from software contributed to Berkeley by
   12  * the Systems Programming Group of the University of Utah Computer
   13  * Science Department.
   14  *
   15  * Redistribution and use in source and binary forms, with or without
   16  * modification, are permitted provided that the following conditions
   17  * are met:
   18  * 1. Redistributions of source code must retain the above copyright
   19  *    notice, this list of conditions and the following disclaimer.
   20  * 2. Redistributions in binary form must reproduce the above copyright
   21  *    notice, this list of conditions and the following disclaimer in the
   22  *    documentation and/or other materials provided with the distribution.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  *
   39  *      @(#)ipc.h       8.4 (Berkeley) 2/19/95
   40  * $FreeBSD: releng/10.2/sys/sys/ipc.h 241837 2012-10-22 02:59:55Z eadler $
   41  */
   42 
   43 /*
   44  * SVID compatible ipc.h file
   45  */
   46 #ifndef _SYS_IPC_H_
   47 #define _SYS_IPC_H_
   48 
   49 #include <sys/cdefs.h>
   50 #include <sys/_types.h>
   51 
   52 #ifndef _GID_T_DECLARED
   53 typedef __gid_t         gid_t;
   54 #define _GID_T_DECLARED
   55 #endif
   56 
   57 #ifndef _KEY_T_DECLARED
   58 typedef __key_t         key_t;
   59 #define _KEY_T_DECLARED
   60 #endif
   61 
   62 #ifndef _MODE_T_DECLARED
   63 typedef __mode_t        mode_t;
   64 #define _MODE_T_DECLARED
   65 #endif
   66 
   67 #ifndef _UID_T_DECLARED
   68 typedef __uid_t         uid_t;
   69 #define _UID_T_DECLARED
   70 #endif
   71 
   72 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
   73     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
   74     defined(COMPAT_43)
   75 struct ipc_perm_old {
   76         unsigned short  cuid;   /* creator user id */
   77         unsigned short  cgid;   /* creator group id */
   78         unsigned short  uid;    /* user id */
   79         unsigned short  gid;    /* group id */
   80         unsigned short  mode;   /* r/w permission */
   81         unsigned short  seq;    /* sequence # (to generate unique ipcid) */
   82         key_t           key;    /* user specified msg/sem/shm key */
   83 };
   84 #endif
   85 
   86 struct ipc_perm {
   87         uid_t           cuid;   /* creator user id */
   88         gid_t           cgid;   /* creator group id */
   89         uid_t           uid;    /* user id */
   90         gid_t           gid;    /* group id */
   91         mode_t          mode;   /* r/w permission */
   92         unsigned short  seq;    /* sequence # (to generate unique ipcid) */
   93         key_t           key;    /* user specified msg/sem/shm key */
   94 };
   95 
   96 #if __BSD_VISIBLE
   97 /* common mode bits */
   98 #define IPC_R           000400  /* read permission */
   99 #define IPC_W           000200  /* write/alter permission */
  100 #define IPC_M           010000  /* permission to change control info */
  101 #endif
  102 
  103 /* SVID required constants (same values as system 5) */
  104 #define IPC_CREAT       001000  /* create entry if key does not exist */
  105 #define IPC_EXCL        002000  /* fail if key exists */
  106 #define IPC_NOWAIT      004000  /* error if request must wait */
  107 
  108 #define IPC_PRIVATE     (key_t)0 /* private key */
  109 
  110 #define IPC_RMID        0       /* remove identifier */
  111 #define IPC_SET         1       /* set options */
  112 #define IPC_STAT        2       /* get options */
  113 #if __BSD_VISIBLE
  114 /*
  115  * For Linux compatability.
  116  */
  117 #define IPC_INFO        3       /* get info */
  118 #endif
  119 
  120 #ifdef _KERNEL
  121 /* Macros to convert between ipc ids and array indices or sequence ids */
  122 #define IPCID_TO_IX(id)         ((id) & 0xffff)
  123 #define IPCID_TO_SEQ(id)        (((id) >> 16) & 0xffff)
  124 #define IXSEQ_TO_IPCID(ix,perm) (((perm.seq) << 16) | (ix & 0xffff))
  125 
  126 struct thread;
  127 struct proc;
  128 struct vmspace;
  129 
  130 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
  131     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
  132 void    ipcperm_old2new(struct ipc_perm_old *, struct ipc_perm *);
  133 void    ipcperm_new2old(struct ipc_perm *, struct ipc_perm_old *);
  134 #endif
  135 
  136 int     ipcperm(struct thread *, struct ipc_perm *, int);
  137 extern void (*shmfork_hook)(struct proc *, struct proc *);
  138 extern void (*shmexit_hook)(struct vmspace *);
  139 
  140 #else /* ! _KERNEL */
  141 
  142 __BEGIN_DECLS
  143 key_t   ftok(const char *, int);
  144 __END_DECLS
  145 
  146 #endif /* _KERNEL */
  147 
  148 #endif /* !_SYS_IPC_H_ */

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