(ddd.info)Attaching to a Process

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6.3 Attaching to a Running Process
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If the debugged program is already running in some process, you can
"attach" to this process (instead of starting a new one with `Run').(1)

   To attach DDD to a process, select `File => Attach to Process'.  You
can now choose from a list of processes.  Then, press the `Attach'
button to attach to the specified process.

   The first thing DDD does after arranging to debug the specified
process is to stop it. You can examine and modify an attached process
with all the DDD commands that are ordinarily available when you start
processes with `Run'. You can insert breakpoints; you can step and
continue; you can modify storage. If you would rather the process
continue running, you may use `Continue' after attaching DDD to the
process.

   When using `Attach to Process', you should first use `Open Program'
to specify the program running in the process and load its symbol table.

   When you have finished debugging the attached process, you can use
the `File => Detach Process' to release it from DDD control.  Detaching
the process continues its execution.  After `Detach Process', that
process and DDD become completely independent once more, and you are
ready to attach another process or start one with `Run'.

   You can customize the list of processes shown by defining an
alternate command to list processes.  See `Edit => Preferences =>
Helpers => List Processes'; Note: Customizing Attaching to Processes,
for details.

Customizing Attaching to Processes

   ---------- Footnotes ----------

   (1) JDB, `pydb', Perl, and Bash do not support attaching the
debugger to running processes.