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KGDB(1)			FreeBSD	General	Commands Manual		       KGDB(1)

NAME
     kgdb -- kernel debugger

SYNOPSIS
     kgdb [-a |	-f | -fullname]	[-q | -quiet] [-v] [-w]	[-d crashdir]
	  [-c core | -n	dumpnr | -r device] [kernel [core]]

DESCRIPTION
     The kgdb utility is a debugger based on gdb(1) that allows	debugging of
     kernel core files.

     The options are as	follows:

     -a		  Increase the annotation level.  An annotation	level of 1
		  features the historical -fullname option of gdb(1).  This is
		  useful when running kgdb in Emacs.  The -f or	-fullname
		  options are supported	for backward compatibility as well.

     -q		  Suppress printing of the banner when the debugger starts.
		  The -quiet form is supported for compatibility as well.

     -v		  Increase verbosity.

     -w		  Opens	kmem-based targets in read-write mode.	(This is iden-
		  tical	to what	--wcore	used to	do in previous gdb versions
		  for FreeBSD.)

     -d	crashdir  Use crashdir instead of the default, /var/crash to locate
		  kernel core dump files in.  The name vmcore. plus the	dump
		  number will be appended to determine the actual dump file
		  name.

     -c	core	  Explicitly use core as the core dump file.

     -n	dumpnr	  Use the kernel core dump file	numbered dumpnr	for debugging.

     -r	device	  Use device to	connect	kgdb to	for a remote debugging ses-
		  sion.

     The -c, -n, and -r	options	are mutually exclusive.

     Optionally, the name of the kernel	symbol file and	the name of the	core
     dump file can be supplied on the command-line as positional arguments.
     If	no kernel symbol file name has been given, the symbol file of the cur-
     rently running kernel will	be used.  If no	core dump file has been	speci-
     fied through either of the	options	or the last command-line argument,
     /dev/mem will be opened to	allow debugging	the currently running kernel.

FILES
     /dev/mem	 Default memory	image to open if no core dump file has been
		 specified.

     /var/crash	 Default directory to locate kernel core dump files.

SEE ALSO
     gdb(1)

HISTORY
     The kgdb utility first appeared in	its current form in FreeBSD 5.3.

FreeBSD	9.2		       October 11, 2006			   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY

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