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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)msgbuf.h 8.1 (Berkeley) 6/2/93 34 * $FreeBSD: src/sys/sys/msgbuf.h,v 1.14.2.1 2001/01/16 12:26:21 phk Exp $ 35 * $DragonFly: src/sys/sys/msgbuf.h,v 1.6 2006/09/30 20:03:44 swildner Exp $ 36 */ 37 38 #ifndef _SYS_MSGBUF_H_ 39 #define _SYS_MSGBUF_H_ 40 41 #ifndef _SYS_TYPES_H_ 42 #include <sys/types.h> 43 #endif 44 45 struct msgbuf { 46 #define MSG_MAGIC 0x063062 47 unsigned int msg_magic; 48 unsigned int msg_size; /* size of buffer area */ 49 unsigned int msg_bufx; /* write pointer */ 50 unsigned int msg_bufr; /* read pointer */ 51 char * msg_ptr; /* pointer to buffer */ 52 }; 53 54 #ifdef _KERNEL 55 extern int msgbuftrigger; 56 extern struct msgbuf *msgbufp; 57 void msgbufinit (void *ptr, size_t size); 58 59 #if !defined(MSGBUF_SIZE) 60 #define MSGBUF_SIZE 65536 61 #endif 62 63 #endif 64 65 #endif 66