[issue11877] Change os.fsync() to support physical backing store syncs

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

11877.2.diff: On Mac OS X, fsync(fd, full_sync=True); fsync(fd) do a full sync twice. You should restore the old file flags at fsync() exit. Or this surprising behaviour should be documented.

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