Ross Lagerwall <rosslagerw...@gmail.com> added the comment:

I don't think setting the cloexec flag is a viable solution, especially since 
fds can be opened in custom c modules.

For what its worth, an strace of Java's Process class appears to "cheat" by 
opening /proc/self/fd inbetween fork & exec.

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