sys/sys/ipc.h

   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  * 3. 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: src/sys/sys/ipc.h,v 1.15 1999/12/29 04:24:43 peter Exp $
  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 /*
  53  * XXX cuid and uid should be uid_t; cgid and gid should be gid_t
  54  *     mode should be mode_t; see 1003.1-2008
  55  */
  56 struct ipc_perm {
  57         unsigned short  cuid;   /* creator user id; XXX should be uid_t */
  58         unsigned short  cgid;   /* creator group id; XXX should be gid_t */
  59         unsigned short  uid;    /* user id; XXX should be uid_t */
  60         unsigned short  gid;    /* group id; XXX should be gid_t */
  61         unsigned short  mode;   /* r/w permission */
  62         unsigned short  seq;    /* sequence # (to generate unique msg/sem/shm id) */
  63         key_t           key;    /* user specified msg/sem/shm key */
  64 };
  65
  66 #if __BSD_VISIBLE
  67 /* common mode bits */
  68 #define IPC_R           000400  /* read permission */
  69 #define IPC_W           000200  /* write/alter permission */
  70 #define IPC_M           010000  /* permission to change control info */
  71 #endif
  72
  73 /* SVID required constants (same values as system 5) */
  74 #define IPC_CREAT       001000  /* create entry if key does not exist */
  75 #define IPC_EXCL        002000  /* fail if key exists */
  76 #define IPC_NOWAIT      004000  /* error if request must wait */
  77
  78 #define IPC_PRIVATE     (key_t)0 /* private key */
  79
  80 #define IPC_RMID        0       /* remove identifier */
  81 #define IPC_SET         1       /* set options */
  82 #define IPC_STAT        2       /* get options */
  83
  84 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  85
  86 /* Macros to convert between ipc ids and array indices or sequence ids */
  87 #define IPCID_TO_IX(id)         ((id) & 0xffff)
  88 #define IPCID_TO_SEQ(id)        (((id) >> 16) & 0xffff)
  89 #define IXSEQ_TO_IPCID(ix,perm) (((perm.seq) << 16) | ((ix) & 0xffff))
  90
  91 struct proc;
  92
  93 #endif
  94
  95 #ifdef _KERNEL
  96
  97 int     ipcperm(struct proc *, struct ipc_perm *, int);
  98
  99 #else /* ! _KERNEL */
 100
 101 /* XXX doesn't really belong here, but has been historical practice in SysV. */
 102
 103 __BEGIN_DECLS
 104 key_t   ftok(const char *, int);
 105 __END_DECLS
 106
 107 #endif /* _KERNEL */
 108
 109 #endif /* !_SYS_IPC_H_ */