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

[exarkun at twistedmatrix.com]

On 05:22 pm, glyph at twistedmatrix.com wrote:
>
>On Aug 31, 2010, at 10:03 AM, Guido van Rossum wrote:
>>On Linux you can look somewhere in /proc, but I don't know that it
>>would help you find where a file was opened.
>
>"/dev/fd" is actually a somewhat portable way of getting this 
>information.  I don't think it's part of a standard, but on Linux it's 
>usually a symlink to "/proc/self/fd", and it's available on MacOS and 
>most BSDs (based on a hasty and completely-not-comprehensive 
>investigation).  But it won't help you find out when the FDs were 
>originally opened, no.
>_______________________________________________

On OS X and Solaris, dtrace and ustack will tell you exactly when and 
where the FDs were originally opened, though.  On Linux, SystemTap might 
give you the same information (but I know much less about SystemTap). 
If http://bugs.python.org/issue4111 is resolved, then this may even be 
possible without using a patched version of Python.

Jean-Paul