[issue8052] subprocess close_fds behavior should only close open fds

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> I like the approach suggested by Gregory in issue11284 (msg129912) - if we are
> sure the program is not multithreaded, get the list of fds before forking, and
> use that; otherwise, do it the slow way.

A signal handler can also opens new files :-)

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<http://bugs.python.org/issue8052>
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