[zeromq-dev] [PULL] x317: implement zmq_unbind(), zmq_disconnect(), zmq->sock->getsockopt(ZMQ_LAST_ENDPOINT_ID)

[Sergey Hripchenko]

Please review and approve.


The usage scheme:


After EACH successful call to sock->bind() or sock->connect() you can call
sock->getsockopt(ZMQ_LAST_ENDPOINT) to obtain resolved endpoint address string and
sock->getsockopt(ZMQ_LAST_ENDPOINT_ID) to obtain 'void *' endpoint handle.


Later on you can call sock->unbind() or sock->disconnect() with saved endpoint handle to terminate endpoint.
(Of course if we want to do it right we need to change sock->bind() and sock->connect() to return endpoint handle if succeeded, but API change is almost impossible...)


Current implementation cons/incompatibilities (and potential improvements):
* doesn't work with 'inproc' transport(just unset ZMQLAST_ENDPOINT and ZMQ_LAST_ENDPOINT_ID after every call to bind(inproc://) or connect(inproc://). I just don't know how it works :(
* no specific error code/confirmation that endpoint handle passed to unbind()/disconnect() is actually valid and terminated. Easily could be implemented if needed.
* ZMQ_LAST_ENDPOINT changed more often than before(after _EACH successful call to bind()/connect() )
* *address_t->to_string() hierarchy could be improved.


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