[issue7213] Popen.subprocess change close_fds default to True

[Milko Krachounov]

Milko Krachounov <python at milko.3mhz.net> added the comment:

The cloexec approach still doesn't help with issue 2320. In fact, with threading and people calling subprocess from multiple threads, *this* issue wouldn't be fixed with my patch either unless mutexes are used. It's impossible to avoid a race here with threads and no mutex as far as I can tell. It would mean that the creation of the pipe, the fork and the setting of the CLOEXEC flag needs to be done atomically... yikes.

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<http://bugs.python.org/issue7213>
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