zmq_close - close 0MQ socket
int zmq_close (void *socket);
The zmq_close() function shall destroy the socket referenced by the socket argument. Any outstanding messages physically received from the network but not yet received by the application with zmq_recv() shall be discarded. The behaviour for discarding messages sent by the application with zmq_send() but not yet physically transferred to the network depends on the value of the ZMQ_LINGER socket option for the specified socket.
The zmq_close() function shall return zero if successful. Otherwise it shall
-1 and set errno to one of the values defined below.
The provided socket was invalid.
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