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  * SPDX-License-Identifier: BSD-3-Clause
    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  * $FreeBSD: releng/12.0/sys/sys/msgbuf.h 337545 2018-08-09 17:47:47Z kevans $
   33  */
   34 
   35 #ifndef _SYS_MSGBUF_H_
   36 #define _SYS_MSGBUF_H_
   37 
   38 #include <sys/lock.h>
   39 #include <sys/mutex.h>
   40 
   41 struct msgbuf {
   42         char       *msg_ptr;            /* pointer to buffer */
   43 #define MSG_MAGIC       0x063062
   44         u_int      msg_magic;
   45         u_int      msg_size;            /* size of buffer area */
   46         u_int      msg_wseq;            /* write sequence number */
   47         u_int      msg_rseq;            /* read sequence number */
   48         u_int      msg_cksum;           /* checksum of contents */
   49         u_int      msg_seqmod;          /* range for sequence numbers */
   50         int        msg_lastpri;         /* saved priority value */
   51         u_int      msg_flags;
   52 #define MSGBUF_NEEDNL   0x01    /* set when newline needed */
   53         struct mtx msg_lock;            /* mutex to protect the buffer */
   54 };
   55 
   56 /* Normalise a sequence number or a difference between sequence numbers. */
   57 #define MSGBUF_SEQNORM(mbp, seq)        (((seq) + (mbp)->msg_seqmod) % \
   58     (mbp)->msg_seqmod)
   59 #define MSGBUF_SEQ_TO_POS(mbp, seq)     ((seq) % (mbp)->msg_size)
   60 /* Subtract sequence numbers.  Note that only positive values result. */
   61 #define MSGBUF_SEQSUB(mbp, seq1, seq2)  (MSGBUF_SEQNORM((mbp), (seq1) - (seq2)))
   62 
   63 #ifdef _KERNEL
   64 extern int      msgbufsize;
   65 extern int      msgbuftrigger;
   66 extern struct   msgbuf *msgbufp;
   67 extern struct   mtx msgbuf_lock;
   68 
   69 void    msgbufinit(void *ptr, int size);
   70 void    msgbuf_addchar(struct msgbuf *mbp, int c);
   71 void    msgbuf_addstr(struct msgbuf *mbp, int pri, const char *str, int filter_cr);
   72 void    msgbuf_clear(struct msgbuf *mbp);
   73 void    msgbuf_copy(struct msgbuf *src, struct msgbuf *dst);
   74 int     msgbuf_getbytes(struct msgbuf *mbp, char *buf, int buflen);
   75 int     msgbuf_getchar(struct msgbuf *mbp);
   76 int     msgbuf_getcount(struct msgbuf *mbp);
   77 void    msgbuf_init(struct msgbuf *mbp, void *ptr, int size);
   78 int     msgbuf_peekbytes(struct msgbuf *mbp, char *buf, int buflen,
   79             u_int *seqp);
   80 void    msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size);
   81 
   82 #ifndef MSGBUF_SIZE
   83 #define MSGBUF_SIZE     (32768 * 3)
   84 #endif
   85 #endif /* KERNEL */
   86 
   87 #endif /* !_SYS_MSGBUF_H_ */

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