[issue21515] Use Linux O_TMPFILE flag in tempfile.TemporaryFile?

[STINNER Victor]

STINNER Victor added the comment:

(Oops, I made a mistake, the hardcoded constant was still present in my patch 2.)

Patch 3 uses tempfile._O_TMPFILE_WORKS variable to check if the O_TMPFILE flag is avaialble and works.

Use "os.O_TMPFILE = 0o20000000 | os.O_DIRECTORY" to try my patch with glibc older than 2.19.

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Added file: http://bugs.python.org/file35277/tempfile_o_tmpfile3.patch

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