To double the receive buffer of a socketpair does not help as sending

checks the send buffer size.  So double both buffer sizes.
Moreover the default for sending is 2048 and for receiving is 4096.
This makes the existing double buffer algorithm inconsistent.  It
is better to make the buffers large enough to hold 8 full length
messages.  Just make sure that it does not shrink.
Keep the approach that doubles the buffer sizes.  When we are low
on buffers and cannot reach the full size, increase it as much as
possible.
While there, add consistent error messages.
OK benno@

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