[issue10897] UNIX mmap unnecessarily dup() file descriptor

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Well, I agree on the principle, but it is a change in behaviour and would probably break some user code...
Perhaps by adding some new argument to the mmap constructor? (dup_fd = True)

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<http://bugs.python.org/issue10897>
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