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 1048576 66 #endif 67 68 #endif 69 70 #endif 71