1af2d1c3e1
Now that the socket forward code is extracted we can extend it to not just support bidirectional sockets but also input/output fd-pairs. This will be needed for e.g. the varlinkctl protocol upgrade support where one side of the connection is a fd-pair (stdin/stdout). This is done by creating two half-duplex forwarders that operate independantly. This also allows to simplify some state tracking, e.g. because each fd serves only one direction we don't need to dynamically create the event mask with EPOLLIN etc, its enough to set it once. It also handles non-pollable FDs transparently. Thanks to Lennart for his excellent suggestions here.
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