FreeBSD/Linux Kernel Cross Reference
sys/gdbscripts/msgbuf

     # $NetBSD: msgbuf,v 1.2 2001/01/11 05:31:02 deberg Exp $
     #
     # Copyright (c) 2000 The NetBSD Foundation, Inc.
     # All rights reserved.
     #
     # This code is derived from software contributed to The NetBSD Foundation
     # by John A. Hawkinson
     #
     # 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. All advertising materials mentioning features or use of this software
    #    must display the following acknowledgement:
    #        This product includes software developed by the NetBSD
    #        Foundation, Inc. and its contributors.
    # 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
    #
    
    define msgbuf
      set $bufx=*(long*)((char *)msgbufp+1*sizeof(long))
      set $bufr=*(long*)((char *)msgbufp+2*sizeof(long))
      set $bufs=*(long*)((char *)msgbufp+3*sizeof(long))
    
      printf "msgbufp %#x: bufx %d bufr %d bufs %d\n", msgbufp, $bufx, $bufr, $bufs
    
    # Dump the unread section
    #  set $l = $bufx - $bufr
    #  if ($l < 0)
    #    set $l = $bufs - $bufr
    #  end
    #  set $p = (long)msgbufp+4*sizeof(long)+$bufr
    #  set print elements $l
    #  x/s $p
    
    # Dump the whole thing
    # Presume each section is null-terminated. Possibly bad presumption?
      set $p = (long)msgbufp+4*sizeof(long)+$bufx
      set $l = $bufs - $bufx
      set print elements $l
      printf "Dumping %#x length %d\n", $p, $l  
      # XXX (unsupported by gdb): printf "%.*s\n", $l, $p
      printf "%s\n", $p
      set $p = (long)msgbufp+4*sizeof(long)
      set $l = $bufx
      set print elements $l
      printf "Dumping %#x length %d\n", $p, $l  
      # XXX (unsupported by gdb): printf "%.*s\n\n", $l, $p
      printf "%s\n\n", $p
    end
    
    document msgbuf
      Dump the kernel message buffer.
    end

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