Section: 0MQ Manual (3)
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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 default setting of ZMQ_LINGER does not discard unsent messages; this behaviour may cause the application to block when calling zmq_term(). For details refer to zmq_setsockopt(3) and zmq_term(3).
The zmq_close() function shall return zero if successful. Otherwise it shall return -1 and set errno to one of the values defined below.
zmq_socket(3) zmq_term(3) zmq_setsockopt(3) zmq(7)
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