169 lines
4.1 KiB
Groff
169 lines
4.1 KiB
Groff
.\"-
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.\" Copyright (c) 2007-2008 Robert N. M. Watson
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 24, 2008
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.Dt DDB 8
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.Os
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.Sh NAME
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.Nm ddb
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.Nd "configure DDB kernel debugger properties"
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.Sh SYNOPSIS
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.Nm
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.Cm capture
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.Op Fl M core
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.Op Fl N system
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.Cm print
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.Nm
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.Cm capture
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.Op Fl M core
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.Op Fl N system
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.Cm status
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.Nm
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.Cm script
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.Ar scriptname
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.Nm
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.Cm script
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.Ar scriptname Ns = Ns Ar script
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.Nm
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.Cm scripts
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.Nm
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.Cm unscript
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.Ar scriptname
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.Nm
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.Ar pathname
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.Sh DESCRIPTION
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The
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.Nm
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utility configures certain aspects of the
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.Xr ddb 4
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kernel debugger from user space that are not configured at compile-time or
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easily via
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.Xr sysctl 8
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MIB entries.
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.Pp
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To ease configuration, commands can be put in a file which is processed using
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.Nm
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as shown in the last synopsis line.
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An absolute
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.Ar pathname
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must be used.
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The file will be read line by line and applied as arguments to the
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.Nm
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utility.
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Whitespace at the beginning of lines will be ignored as will lines where the
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first non-whitespace character is
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.Ql # .
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.Sh OUTPUT CAPTURE
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The
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.Nm
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utility can be used to extract the contents of the
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.Xr ddb 4
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output capture buffer of the current live kernel, or from the crash dump of a
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kernel on disk.
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The following debugger commands are available from the command line:
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.Bl -tag -width indent
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.It Xo
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.Cm capture
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.Op Fl M Ar core
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.Op Fl N Ar system
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.Cm print
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.Xc
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Print the current contents of the
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.Xr ddb 4
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output capture buffer.
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.It Xo
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.Cm capture
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.Op Fl M Ar core
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.Op Fl N Ar system
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.Cm status
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.Xc
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Print the current status of the
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.Xr ddb 4
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output capture buffer.
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.El
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.Sh SCRIPTING
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The
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.Nm
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utility can be used to configure aspects of
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.Xr ddb 4
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scripting from user space; scripting support is described in more detail in
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.Xr ddb 4 .
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Each of the debugger commands is available from the command line:
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.Bl -tag -width indent
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.It Cm script Ar scriptname
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Print the script named
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.Ar scriptname .
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.It Cm script Ar scriptname Ns = Ns Ar script
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Define a script named
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.Ar scriptname .
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As many scripts contain characters interpreted in special ways by the shell,
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it is advisable to enclose
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.Ar script
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in quotes.
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.It Cm scripts
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List currently defined scripts.
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.It Cm unscript Ar scriptname
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Delete the script named
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.Ar scriptname .
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.El
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.Sh EXIT STATUS
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.Ex -std
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.Sh EXAMPLES
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The following example defines a script that will execute when the kernel
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debugger is entered as a result of a break signal:
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.Bd -literal -offset indent
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ddb script kdb.enter.break="show pcpu; bt"
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.Ed
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.Pp
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The following example will delete the script:
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.Pp
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.Dl "ddb unscript kdb.enter.break"
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.Pp
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For further examples, see the
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.Xr ddb 4
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and
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.Xr textdump 4
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manual pages.
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.Sh SEE ALSO
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.Xr ddb 4 ,
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.Xr textdump 4 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Fx 7.1 .
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.Sh AUTHORS
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.An Robert N M Watson
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.Sh BUGS
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Ideally,
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.Nm
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would not exist, as all pertinent aspects of
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.Xr ddb 4
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could be configured directly via
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.Xr sysctl 8 .
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