sys/sys/msgbuf.h

   1 /*
   2  * Copyright (c) 1981, 1984, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)msgbuf.h    8.1 (Berkeley) 6/2/93
  30  * $FreeBSD: src/sys/sys/msgbuf.h,v 1.14.2.1 2001/01/16 12:26:21 phk Exp $
  31  * $DragonFly: src/sys/sys/msgbuf.h,v 1.6 2006/09/30 20:03:44 swildner Exp $
  32  */
  33
  34 #ifndef _SYS_MSGBUF_H_
  35 #define _SYS_MSGBUF_H_
  36
  37 #ifndef _SYS_TYPES_H_
  38 #include <sys/types.h>
  39 #endif
  40
  41 /*
  42  * NOTE!  The indices are not masked against msg_size.  All accessors
  43  *        must mask the indices against msg_size to get actual buffer
  44  *        indexes.  For relative block sizes, simple subtraction can be
  45  *        used using unsigned integers.
  46  */
  47 struct  msgbuf {
  48 #define MSG_MAGIC       0x063064
  49 #define MSG_OMAGIC      0x063062
  50         unsigned int    msg_magic;
  51         unsigned int    msg_size;               /* size of buffer area */
  52         unsigned int    msg_bufx;               /* write index - kernel */
  53         unsigned int    msg_bufr;               /* base index  - kernel */
  54         char *          msg_ptr;                /* pointer to buffer */
  55         unsigned int    msg_bufl;               /* read index - log device */
  56         unsigned int    msg_unused01;
  57 };
  58
  59 #ifdef _KERNEL
  60 extern int      msgbuftrigger;
  61 extern struct   msgbuf *msgbufp;
  62 void    msgbufinit      (void *ptr, size_t size);
  63
  64 #if !defined(MSGBUF_SIZE)
  65 #define MSGBUF_SIZE     131072
  66 #endif
  67
  68 #endif
  69
  70 #endif