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5363388fc5
During introduction of EHOSTUNREACH, missing mapping between EHOSTUNREACH errno and false/0 return code for socket's send() calls was missing, throwing an exception. To be consistent with the rest of wrappers (e.g. DONTWAIT), fix it by handling this errno as a regular EAGAIN, and let the caller use errno/zmq_errno() to branch on their code.
This is C++ binding for 0MQ The contribution policy is at: http://rfc.zeromq.org/spec:22