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/msgbuf.h

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    1 /*      $NetBSD: msgbuf.h,v 1.11 2003/08/07 16:34:09 agc Exp $  */
    2 
    3 /*
    4  * Copyright (c) 1981, 1984, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)msgbuf.h    8.1 (Berkeley) 6/2/93
   32  */
   33 
   34 #ifndef _SYS_MSGBUF_H_
   35 #define _SYS_MSGBUF_H_
   36 
   37 struct  kern_msgbuf {
   38 #define MSG_MAGIC       0x063061
   39         long    msg_magic;
   40         long    msg_bufx;               /* write pointer */
   41         long    msg_bufr;               /* read pointer */
   42         long    msg_bufs;               /* real msg_bufc size (bytes) */
   43         char    msg_bufc[1];            /* buffer */
   44 };
   45 
   46 #ifdef _KERNEL
   47 extern int      msgbufmapped;           /* is the message buffer mapped */
   48 extern int      msgbufenabled;          /* is logging to the buffer enabled */
   49 extern struct   kern_msgbuf *msgbufp;   /* the mapped buffer, itself. */
   50 
   51 void    initmsgbuf __P((caddr_t buf, size_t bufsize));
   52 #endif
   53 
   54 #endif /* !_SYS_MSGBUF_H_ */

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