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ddb (8)
  • ddb (4) ( FreeBSD man: Специальные файлы /dev/* )
  • >> ddb (8) ( FreeBSD man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    ddb
    
     - configure DDB kernel debugger properties
    
     
    

    SYNOPSIS

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

    DESCRIPTION

    The 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 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 utility. Whitespace at the beginning of lines will be ignored as will lines where the first non-whitespace character is `#'  

    OUTPUT CAPTURE

    The 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.
     

    SCRIPTING

    The 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 characters interpreted in special ways by the shell, it is advisable to enclose script in quotes.
    scripts
    List currently defined scripts.
    unset scriptname
    Delete the script named scriptname

     

    EXIT STATUS

    Ex -std  

    EXAMPLES

    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.  

    SEE ALSO

    ddb(4), textdump(4), sysctl(8)  

    HISTORY

    The utility first appeared in Fx 7.1 .  

    AUTHORS

    An Robert N M Watson  

    BUGS

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


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    OUTPUT CAPTURE
    SCRIPTING
    EXIT STATUS
    EXAMPLES
    SEE ALSO
    HISTORY
    AUTHORS
    BUGS


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