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* fhandler.cc (fhandler_base_overlapped::setup_overlapped): Explicitly set io_pending to false. (fhandler_base_overlapped::has_ongoing_io): Call GetOverlappedResult to force completion of I/O. (fhandler_base_overlapped::wait_overlapped): Rewrite to correctly deal with nonblocking reads and to make more race proof. (fhandler_base_overlapped::raw_write): Deal with new enum values. (fhandler_base_overlapped::raw_read): Ditto. Don't deal with ongoing I/O here since it makes no sense in the read context. * fhandler.h (enum wait_return): Add overlapped_unknown, overlapped_nonblocking_no_data. * pipe.cc (pipe): Add debugging output.
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