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Because it complains it is not supported on sockets not connected.

But, for some reason, it doesn't really work. The tests fail with
strange error. To be talked about on ML.

also constify some variables, and remove unnecessary cast.

Remove the READ/WRITE and DEFAULT macros by replacing them with
functions that thrown an exception on failure.  Other modifications
also made to make the code consistent with this model.

sigh.

case.

the point of the test more accurately.

lines.

added some more comments.

updating the implementation.