FreeBSD/Linux Kernel Cross Reference
sys/sys/msgbuf.h
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
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