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: releng/11.0/sys/sys/msgbuf.h 233135 2012-03-19 00:36:32Z eadler $
   31  */
   32 
   33 #ifndef _SYS_MSGBUF_H_
   34 #define _SYS_MSGBUF_H_
   35 
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 
   39 struct msgbuf {
   40         char       *msg_ptr;            /* pointer to buffer */
   41 #define MSG_MAGIC       0x063062
   42         u_int      msg_magic;
   43         u_int      msg_size;            /* size of buffer area */
   44         u_int      msg_wseq;            /* write sequence number */
   45         u_int      msg_rseq;            /* read sequence number */
   46         u_int      msg_cksum;           /* checksum of contents */
   47         u_int      msg_seqmod;          /* range for sequence numbers */
   48         int        msg_lastpri;         /* saved priority value */
   49         u_int      msg_flags;
   50 #define MSGBUF_NEEDNL   0x01    /* set when newline needed */
   51         struct mtx msg_lock;            /* mutex to protect the buffer */
   52 };
   53 
   54 /* Normalise a sequence number or a difference between sequence numbers. */
   55 #define MSGBUF_SEQNORM(mbp, seq)        (((seq) + (mbp)->msg_seqmod) % \
   56     (mbp)->msg_seqmod)
   57 #define MSGBUF_SEQ_TO_POS(mbp, seq)     ((seq) % (mbp)->msg_size)
   58 /* Subtract sequence numbers.  Note that only positive values result. */
   59 #define MSGBUF_SEQSUB(mbp, seq1, seq2)  (MSGBUF_SEQNORM((mbp), (seq1) - (seq2)))
   60 
   61 #ifdef _KERNEL
   62 extern int      msgbufsize;
   63 extern int      msgbuftrigger;
   64 extern struct   msgbuf *msgbufp;
   65 extern struct   mtx msgbuf_lock;
   66 
   67 void    msgbufinit(void *ptr, int size);
   68 void    msgbuf_addchar(struct msgbuf *mbp, int c);
   69 void    msgbuf_addstr(struct msgbuf *mbp, int pri, char *str, int filter_cr);
   70 void    msgbuf_clear(struct msgbuf *mbp);
   71 void    msgbuf_copy(struct msgbuf *src, struct msgbuf *dst);
   72 int     msgbuf_getbytes(struct msgbuf *mbp, char *buf, int buflen);
   73 int     msgbuf_getchar(struct msgbuf *mbp);
   74 int     msgbuf_getcount(struct msgbuf *mbp);
   75 void    msgbuf_init(struct msgbuf *mbp, void *ptr, int size);
   76 int     msgbuf_peekbytes(struct msgbuf *mbp, char *buf, int buflen,
   77             u_int *seqp);
   78 void    msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size);
   79 
   80 #ifndef MSGBUF_SIZE
   81 #define MSGBUF_SIZE     (32768 * 3)
   82 #endif
   83 #endif /* KERNEL */
   84 
   85 #endif /* !_SYS_MSGBUF_H_ */

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