[issue16860] Use O_CLOEXEC in the tempfile module

[Charles-François Natali]

Charles-François Natali added the comment:

Here's the patch.
It also removes O_NOFOLLOW, which is basically useless (if the file is created with O_CREAT|O_EXCL, then by definition it's not a symlink).

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keywords: +needs review, patch
type:  -> behavior
Added file: http://bugs.python.org/file28560/tempfile_cloexec.diff

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