80 lines
3.3 KiB
C
80 lines
3.3 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* $FreeBSD$
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*/
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#ifndef _SYS_MSGBUF_H_
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#define _SYS_MSGBUF_H_
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struct msgbuf {
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char *msg_ptr; /* pointer to buffer */
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#define MSG_MAGIC 0x063062
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u_int msg_magic;
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u_int msg_size; /* size of buffer area */
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u_int msg_wseq; /* write sequence number */
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u_int msg_rseq; /* read sequence number */
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u_int msg_cksum; /* checksum of contents */
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u_int msg_seqmod; /* range for sequence numbers */
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};
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/* Normalise a sequence number or a difference between sequence numbers. */
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#define MSGBUF_SEQNORM(mbp, seq) (((seq) + (mbp)->msg_seqmod) % \
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(mbp)->msg_seqmod)
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#define MSGBUF_SEQ_TO_POS(mbp, seq) ((seq) % (mbp)->msg_size)
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/* Subtract sequence numbers. Note that only positive values result. */
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#define MSGBUF_SEQSUB(mbp, seq1, seq2) (MSGBUF_SEQNORM((mbp), (seq1) - (seq2)))
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#ifdef _KERNEL
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extern int msgbuftrigger;
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extern struct msgbuf *msgbufp;
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void msgbufinit(void *ptr, int size);
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void msgbuf_addchar(struct msgbuf *mbp, int c);
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void msgbuf_clear(struct msgbuf *mbp);
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void msgbuf_copy(struct msgbuf *src, struct msgbuf *dst);
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int msgbuf_getbytes(struct msgbuf *mbp, char *buf, int buflen);
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int msgbuf_getchar(struct msgbuf *mbp);
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int msgbuf_getcount(struct msgbuf *mbp);
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void msgbuf_init(struct msgbuf *mbp, void *ptr, int size);
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int msgbuf_peekbytes(struct msgbuf *mbp, char *buf, int buflen,
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u_int *seqp);
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void msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size);
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#ifndef MSGBUF_SIZE
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#define MSGBUF_SIZE 32768
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#endif
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#endif /* KERNEL */
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#endif /* !_SYS_MSGBUF_H_ */
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