(ddd.info)Maintenance Menu

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3.1.9 The Maintenance Menu
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The `Maintenance' menu performs operations that are useful for
debugging DDD.

   By default, this menu is disabled; it is enabled by specifically
requesting it at DDD invocation (via the `--maintenance' option; Note:
Options).  It is also enabled when DDD gets a fatal signal.

`Debug DDD'
     Invoke a debugger (typically, GDB) and attach it to this DDD
     process (<F12>).  This is useful only if you are a DDD maintainer.

`Dump Core Now'
     Make this DDD process dump core.  This can also be achieved by
     sending DDD a `SIGUSR1' signal.

`Tic Tac Toe'
     Invoke a Tic Tac Toe game.  You must try to get three stop signs
     in a row, while preventing DDD from doing so with its skulls.
     Click on `New Game' to restart.

`When DDD Crashes'
     Select what to do when DDD gets a fatal signal.

    `Debug DDD'
          Invoke a debugger on the DDD core dump when DDD crashes.
          This is useful only if you are a DDD maintainer.

    `Dump Core'
          Just dump core when DDD crashes; don't invoke a debugger.
          This is the default setting, as the core dump may contain
          important information required for debugging DDD.

    `Do Nothing'
          Do not dump core or invoke a debugger when DDD crashes.

`Remove Menu'
     Make this menu inaccessible again.