[issue39640] fall back os.fdatasync() to fsync() on POSIX systems without fdatasync() support

[George Melikov]

Change by George Melikov <mail at gmelikov.ru>:


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keywords: +patch
pull_requests: +17893
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18516

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39640>
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