return the error number or error description after a zmq call
zmq.errno() zmq.strerror()
an integer for zmq.errno or a string for zmq.strerror
http://www.zeromq.org http://api.zeromq.org http://zguide.zeromq.org/page:all
connect.socket,bind.socket,receive.socket,send.socket
# NOT RUN { library(rzmq) zmq.errno() zmq.strerror() # }
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