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3d5dc65104
When opening a duplexer, open a client connection to the first client handler. Previously we gave the duplexer a bogus write handle, which was just a duplicate of the first client handler's handle. This meant that we had a pipe server with no clients connected, and all I/O attempts failed with STATUS_PIPE_LISTENING. Extend the last fcntl change to duplexers. Remove a now unused fifo_client_handler constructor, as well as the long unusued method fifo_client_handler::connect. Don't create the pipe in duplex mode; the server handle will only be used for reading.
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