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      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
     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