5955da96e2
Make fhandler_fifo a derived class of fhandler_base instead of fhandler_base_overlapped. Replace the create_pipe macro, which is based on fhandler_pipe::create, by new create_pipe and open_pipe methods. These use NT functions instead of Win32 functions. Replace fifo_name by get_pipe_name, which returns a pointer to a UNICODE_STRING. Remove the fnevent macro, which would now be needed only once. Add a raw_write method, adapted from fhandler_base::raw_write. Adapt all functions to the changes above.
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