[Python-Dev] closing files and sockets in a timely manner in the stdlib (original) (raw)

Glyph Lefkowitz glyph at twistedmatrix.com
Sat Oct 30 21:06:45 CEST 2010

On Oct 30, 2010, at 2:39 PM, Jack Diederich wrote:

On Fri, Oct 29, 2010 at 8:35 PM, Brett Cannon <brett at python.org> wrote:

For those of you who have not noticed, Antoine committed a patch that raises a ResourceWarning under a pydebug build if a file or socket is closed through garbage collection instead of being explicitly closed. Just yesterday I discovered /proc//fd/ which is a list of open file descriptors for your PID on *nix and includes all open files, pipes, and sockets. Very handy, I filed some tickets about company internal libs that were opening file handles as a side effect of import (logging mostly). I tried to provoke standard python imports (non-test) to leave some open handles and came up empty.

That path (and anything below /proc, really) is a list of open file descriptors specifically on Linux, not "*nix". Also on linux, you can avoid "" by just doing "/proc/self".

A more portable (albeit not standard) path for "what file descriptors do I have open" is /dev/fd/. This is supported via a symlink to /proc/self on all the Linuxes I've tested on. There's no portable standard equivalent for not-yourself processes that I'm aware of, though.

See more discussion here: <http://twistedmatrix.com/trac/ticket/4522>.

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