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3617fc8859
* fhandler.h (wait_return): Add overlapped_nullread. * fhandler.cc (fhandler_base_overlapped::wait_overlapped): Detect zero-byte read as a special case. (fhandler_base_overlapped::raw_read): Keep looping when zero-byte read detected without EOF. (fhandler_base_overlapped::raw_write): Quiet gcc warning by adding overlapped_nullread to switch statement even though it will never actually be hit.
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