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