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 /* 46 * NOTE! The indices are not masked against msg_size. All accessors 47 * must mask the indices against msg_size to get actual buffer 48 * indexes. For relative block sizes, simple subtraction can be 49 * used using unsigned integers. 50 */ 51 struct msgbuf { 52 #define MSG_MAGIC 0x063064 53 #define MSG_OMAGIC 0x063062 54 unsigned int msg_magic; 55 unsigned int msg_size; /* size of buffer area */ 56 unsigned int msg_bufx; /* write index - kernel */ 57 unsigned int msg_bufr; /* base index - kernel */ 58 char * msg_ptr; /* pointer to buffer */ 59 unsigned int msg_bufl; /* read index - log device */ 60 unsigned int msg_unused01; 61 }; 62 63 #ifdef _KERNEL 64 extern int msgbuftrigger; 65 extern struct msgbuf *msgbufp; 66 void msgbufinit (void *ptr, size_t size); 67 68 #if !defined(MSGBUF_SIZE) 69 #define MSGBUF_SIZE 131072 70 #endif 71 72 #endif 73 74 #endif 75