[issue3512] Change fsync to use fullfsync on platforms (like OS X) that have/need it

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

IMO it would be better not to confuse matters my having os.fsync() call
fullfsync(); it's better to add a separate os.fullfsync() call on
platforms that support it.  That way the application can choose.  I
suppose Apple had a reason for changing the behavior...

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nosy: +gvanrossum

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