[Python-Dev] Internal counter to debug leaking file descriptors

[anatoly techtonik]

Hi,

Is there any kind of internal file descriptor counter that can be
queried to debug issues with leaking resources?
It can be used in tests to check that all tests are finish with 0
opened descriptors.
It will be very useful while porting Python applications from Unix to
Windows. Unix is more tolerant to open files and can overwrite them
and do other nasty things. See the thread from comment #17 -
https://bugs.edge.launchpad.net/dulwich/+bug/557585/ - there is an
example of mmap that starts holding file descriptor somewhere long
before an error occurs. How could one debug this?

Right now I have to use FileMon. It includes information about
operated filenames, but no info about source code where this happens.
It will be nice to have some kind of counter with filename information
inside Python, so that it can be possible to get the full log of
events without manually messing with external system-specific tools
like FileMon.

--
anatoly t.