http://www.perlmonks.org?node_id=803544


in reply to Details of filehandles

Are you using POE::Wheel::Run or something else to set up the IO? P::W::Run has specific methods for catching stdout and stderr.

As usual, it'll probably help if you can post some code that demonstrates the problem.

Edit: the unix program lsof will list open filehandles for all processes, which may be useful.