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/*
* Mach Operating System
* Copyright (c) 1989 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*/
/*
* HISTORY
* $Log: msgbuf.h,v $
* Revision 2.5 89/05/30 10:43:37 rvb
* Rephrased a comment.
* [89/05/17 af]
*
* Revision 2.4 89/03/09 22:05:57 rpd
* More cleanup.
*
* Revision 2.3 89/02/25 17:54:58 gm0w
* Changes for cleanup.
*
* Revision 2.2 89/01/23 22:27:16 af
* Hack for mips msgbuf allocation
* [89/01/07 af]
*/
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)msgbuf.h 7.1 (Berkeley) 6/4/86
*/
#ifndef _SYS_MSGBUF_H_
#define _SYS_MSGBUF_H_
#define MSG_MAGIC 0x063061
#define MSG_BSIZE (4096 - 3 * sizeof (long))
struct msgbuf {
long msg_magic;
long msg_bufx;
long msg_bufr;
char msg_bufc[MSG_BSIZE];
};
#ifdef KERNEL
#if __mips__ || NeXT
/*
* The message buffer lives at the end of physical address
* space, so that we can recover it after a crash.
*/
extern struct msgbuf *pmsgbuf;
#else
extern struct msgbuf msgbuf;
#endif
#endif
#endif
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