ddb man page on FreeBSD

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DDB(8)			  BSD System Manager's Manual			DDB(8)

     ddb — configure DDB kernel debugger properties

     ddb capture [-M -core] [-N -system] print
     ddb capture [-M -core] [-N -system] status
     ddb script scriptname
     ddb script scriptname=script
     ddb scripts
     ddb unscript scriptname
     ddb pathname

     The ddb utility configures certain aspects of the ddb(4) kernel debugger
     from user space that are not configured at compile-time or easily via
     sysctl(8) MIB entries.

     To ease configuration, commands can be put in a file which is processed
     using ddb as shown in the last synopsis line.  An absolute pathname must
     be used.  The file will be read line by line and applied as arguments to
     the ddb utility.  Whitespace at the beginning of lines will be ignored as
     will lines where the first non-whitespace character is ‘#’.

     The ddb utility can be used to extract the contents of the ddb(4) output
     capture buffer of the current live kernel, or from the crash dump of a
     kernel on disk.  The following debugger commands are available from the
     command line:

     capture [-M core] [-N system] print
	     Print the current contents of the ddb(4) output capture buffer.

     capture [-M core] [-N system] status
	     Print the current status of the ddb(4) output capture buffer.

     The ddb utility can be used to configure aspects of ddb(4) scripting from
     user space; scripting support is described in more detail in ddb(4).
     Each of the debugger commands is available from the command line:

     script scriptname
	     Print the script named scriptname.

     script scriptname=script
	     Define a script named scriptname.	As many scripts contain char‐
	     acters interpreted in special ways by the shell, it is advisable
	     to enclose script in quotes.

	     List currently defined scripts.

     unset scriptname
	     Delete the script named scriptname.

     The ddb utility exits 0 on success, and >0 if an error occurs.

     The following example defines a script that will execute when the kernel
     debugger is entered as a result of a break signal:

	   ddb script kdb.enter.break="show pcpu; bt"

     The following example will delete the script:

	   ddb unscript kdb.enter.break

     For further examples, see the ddb(4) and textdump(4) manual pages.

     ddb(4), textdump(4), sysctl(8)

     The ddb utility first appeared in FreeBSD 7.1.

     Robert N M Watson

     Ideally, ddb would not exist, as all pertinent aspects of ddb(4) could be
     configured directly via sysctl(8).

BSD			       December 24, 2008			   BSD

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