[docs] [issue19444] mmap.mmap() allocates a file descriptor that isn't CLOEXEC

[STINNER Victor]

STINNER Victor added the comment:

"the file descriptor that mmap.mmap() allocates is not set to close-on-exec"

In Python 3.4, the file descriptor is now non-inheritable, as a side effect of the PEP 446.
http://www.python.org/dev/peps/pep-0446/

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versions: +Python 3.3, Python 3.4 -Python 3.2

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<http://bugs.python.org/issue19444>
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