Take a gander at Devel::Command::Tdump
for an example of using the typeahead buffer. Debug::Client
seems to be a client to talk to the debugger port.
I don't see any examples of using the filehandle stack - you probably have to do that one yourself if it turns out to be the solution you need - but the basic setup that Devel::Command::Tdump uses, of setting things up in .perldb, is probably the right point to start from; open a pipe to your client program in the BEGIN block, and push it onto @DB::cmdfhs. The debugger will read from it until it returns EOF or a 'q'commmand is seen.
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