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

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

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