[issue18174] Make regrtest with --huntrleaks check for fd leaks

[Charles-François Natali]

Charles-François Natali added the comment:

> Why not using os.fstat() instead of os.dup() to check if a file descriptor is open or not?

I asked myself the same question, but IIRC, fstat() doesn't always
work on Windows (of course).

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<http://bugs.python.org/issue18174>
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