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
37 struct 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
47 extern int msgbufmapped; /* is the message buffer mapped */
48 extern int msgbufenabled; /* is logging to the buffer enabled */
49 extern struct kern_msgbuf *msgbufp; /* the mapped buffer, itself. */
50 extern int log_open; /* is /dev/klog open? */
51
52 void initmsgbuf(void *, size_t);
53 void loginit(void);
54 void logputchar(int);
55
56 static __inline int
logenabled(const struct kern_msgbuf * mbp)57 logenabled(const struct kern_msgbuf *mbp)
58 {
59 return msgbufenabled && mbp->msg_magic == MSG_MAGIC;
60 }
61 #endif
62
63 #endif /* !_SYS_MSGBUF_H_ */
64