[issue13788] os.closerange optimization

[Ronald Oussoren]

Ronald Oussoren added the comment:

Two small technical comments:

1) I'd add a configure or compile-time check to determine if the procfs
   interface might be available. I don't like probing for features that
   you know are not available.

2) MacOSX has simular functionality using /dev/fd instead of
   /proc/${PID}/fd  (and other BSD systems might have this as well)

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nosy: +ronaldoussoren

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