The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/msgbuf.h

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    1 /*-
    2  * Copyright (c) 1981, 1984, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)msgbuf.h    8.1 (Berkeley) 6/2/93
   30  * $FreeBSD$
   31  */
   32 
   33 #ifndef _SYS_MSGBUF_H_
   34 #define _SYS_MSGBUF_H_
   35 
   36 struct msgbuf {
   37         char    *msg_ptr;               /* pointer to buffer */
   38 #define MSG_MAGIC       0x063062
   39         u_int   msg_magic;
   40         u_int   msg_size;               /* size of buffer area */
   41         u_int   msg_wseq;               /* write sequence number */
   42         u_int   msg_rseq;               /* read sequence number */
   43         u_int   msg_cksum;              /* checksum of contents */
   44         u_int   msg_seqmod;             /* range for sequence numbers */
   45 };
   46 
   47 /* Normalise a sequence number or a difference between sequence numbers. */
   48 #define MSGBUF_SEQNORM(mbp, seq)        (((seq) + (mbp)->msg_seqmod) % \
   49     (mbp)->msg_seqmod)
   50 #define MSGBUF_SEQ_TO_POS(mbp, seq)     ((seq) % (mbp)->msg_size)
   51 /* Subtract sequence numbers.  Note that only positive values result. */
   52 #define MSGBUF_SEQSUB(mbp, seq1, seq2)  (MSGBUF_SEQNORM((mbp), (seq1) - (seq2)))
   53 
   54 #ifdef _KERNEL
   55 extern int      msgbuftrigger;
   56 extern struct   msgbuf *msgbufp;
   57 
   58 void    msgbufinit(void *ptr, int size);
   59 void    msgbuf_addchar(struct msgbuf *mbp, int c);
   60 void    msgbuf_clear(struct msgbuf *mbp);
   61 void    msgbuf_copy(struct msgbuf *src, struct msgbuf *dst);
   62 int     msgbuf_getbytes(struct msgbuf *mbp, char *buf, int buflen);
   63 int     msgbuf_getchar(struct msgbuf *mbp);
   64 int     msgbuf_getcount(struct msgbuf *mbp);
   65 void    msgbuf_init(struct msgbuf *mbp, void *ptr, int size);
   66 int     msgbuf_peekbytes(struct msgbuf *mbp, char *buf, int buflen,
   67             u_int *seqp);
   68 void    msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size);
   69 
   70 #ifndef MSGBUF_SIZE
   71 #define MSGBUF_SIZE     32768
   72 #endif
   73 #endif /* KERNEL */
   74 
   75 #endif /* !_SYS_MSGBUF_H_ */

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