1 /* $OpenBSD: msgbuf.h,v 1.13 2020/10/25 10:55:42 visa Exp $ */ 2 /* $NetBSD: msgbuf.h,v 1.8 1995/03/26 20:24:27 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1981, 1984, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)msgbuf.h 8.1 (Berkeley) 6/2/93 33 */ 34 35 /* 36 * Locking: 37 * I immutable after creation 38 * L log_mtx 39 * Lw log_mtx for writing 40 */ 41 struct msgbuf { 42 #define MSG_MAGIC 0x063061 43 long msg_magic; /* [I] buffer magic value */ 44 long msg_bufx; /* [L] write pointer */ 45 long msg_bufr; /* [L] read pointer */ 46 long msg_bufs; /* [I] real msg_bufc size (bytes) */ 47 long msg_bufd; /* [L] number of dropped bytes */ 48 char msg_bufc[1]; /* [Lw] buffer */ 49 }; 50 #ifdef _KERNEL 51 #define CONSBUFSIZE (16 * 1024) /* console message buffer size */ 52 extern struct msgbuf *msgbufp; 53 extern struct msgbuf *consbufp; 54 55 void initmsgbuf(caddr_t buf, size_t bufsize); 56 void initconsbuf(void); 57 void msgbuf_putchar(struct msgbuf *, const char c); 58 #endif 59