1/*	$NetBSD: msgbuf.h,v 1.18 2022/10/26 23:28:43 riastradh Exp $	*/
 2
 3/*
 4 * Copyright (c) 1981, 1984, 1993
 5 *	The Regents of the University of California.  All rights reserved.
 6 *
 7 * Redistribution and use in source and binary forms, with or without
 8 * modification, are permitted provided that the following conditions
 9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	@(#)msgbuf.h	8.1 (Berkeley) 6/2/93
32 */
33
34#ifndef _SYS_MSGBUF_H_
35#define _SYS_MSGBUF_H_
36
37struct	kern_msgbuf {
38#define	MSG_MAGIC	0x063061
39	long	msg_magic;
40	long	msg_bufx;		/* write pointer */
41	long	msg_bufr;		/* read pointer */
42	long	msg_bufs;		/* real msg_bufc size (bytes) */
43	char	msg_bufc[1];		/* buffer */
44};
45
46#ifdef _KERNEL
47extern int	msgbufmapped;		/* is the message buffer mapped */
48extern int	msgbufenabled;		/* is logging to the buffer enabled */
49extern struct	kern_msgbuf *msgbufp;	/* the mapped buffer, itself. */
50extern int	log_open;		/* is /dev/klog open? */
51
52void	initmsgbuf(void *, size_t);
53void	loginit(void);
54void	logputchar(int);
55
56static __inline int
57logenabled(const struct kern_msgbuf *mbp)
58{
59	return msgbufenabled && mbp->msg_magic == MSG_MAGIC;
60}
61#endif
62
63#endif /* !_SYS_MSGBUF_H_ */