When using libdlpi, if a link is opened (dlpi_open), and bound to a
given sap (dlpi_bind), I strongly suspect that all matching messages
(packets) on that link are queued for consumption (using dlpi_recv()
to drain the queue). What I can't find is what happens if too many
messages get queued before dlpi_recv() can drain them -- the obvious
thing is to drop subsequent packets until there's enough room to
enqueue more, but how would one detect that condition?
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