zmq_unbind(3)

1ZMQ_UNBIND(3)                     0MQ Manual                     ZMQ_UNBIND(3)
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NAME

6       zmq_unbind - Stop accepting connections on a socket
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SYNOPSIS

9       int zmq_unbind (void *socket, const char *endpoint);
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DESCRIPTION

12       The zmq_unbind() function shall unbind a socket specified by the socket
13       argument from the endpoint specified by the endpoint argument.
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15       Addionally the incoming message queue associated with the endpoint will
16       be discarded. This means that after unbinding an endpoint it is
17       possible to received messages originating from that same endpoint if
18       they were already present in the incoming message queue before
19       unbinding.
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21       The endpoint argument is as described in zmq_bind(3)
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23   Unbinding wild-card address from a socket
24       When wild-card * endpoint (described in zmq_tcp(7), zmq_ipc(7),
25       zmq_udp(7) and zmq_vmci(7)) was used in zmq_bind(), the caller should
26       use real endpoint obtained from the ZMQ_LAST_ENDPOINT socket option to
27       unbind this endpoint from a socket.
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RETURN VALUE

30       The zmq_unbind() function shall return zero if successful. Otherwise it
31       shall return -1 and set errno to one of the values defined below.
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ERRORS

34       EINVAL
35           The endpoint supplied is invalid.
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37       ETERM
38           The 0MQ context associated with the specified socket was
39           terminated.
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41       ENOTSOCK
42           The provided socket was invalid.
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44       ENOENT
45           The endpoint supplied was not previously bound.
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EXAMPLES

48       Unbind a subscriber socket from a TCP transport.
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50           /* Create a ZMQ_SUB socket */
51           void *socket = zmq_socket (context, ZMQ_SUB);
52           assert (socket);
53           /* Connect it to the host server001, port 5555 using a TCP transport */
54           rc = zmq_bind (socket, "tcp://127.0.0.1:5555");
55           assert (rc == 0);
56           /* Disconnect from the previously connected endpoint */
57           rc = zmq_unbind (socket, "tcp://127.0.0.1:5555");
58           assert (rc == 0);
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60       Unbind wild-card * binded socket.
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62           /* Create a ZMQ_SUB socket */
63           void *socket = zmq_socket (context, ZMQ_SUB);
64           assert (socket);
65           /* Bind it to the system-assigned ephemeral port using a TCP transport */
66           rc = zmq_bind (socket, "tcp://127.0.0.1:*");
67           assert (rc == 0);
68           /* Obtain real endpoint */
69           const size_t buf_size = 32;
70           char buf[buf_size];
71           rc = zmq_getsockopt (socket, ZMQ_LAST_ENDPOINT, buf, (size_t *)&buf_size);
72           assert (rc == 0);
73           /* Unbind socket by real endpoint */
74           rc = zmq_unbind (socket, buf);
75           assert (rc == 0);
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NOTE

79       Note that while the implementation is similar to zmq_disconnect(), the
80       semantics are different and the two functions should not be used
81       interchangeably. Bound sockets should be unbound, and connected sockets
82       should be disconnected.
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AUTHORS

88       This page was written by the 0MQ community. To make a change please
89       read the 0MQ Contribution Policy at
90       http://www.zeromq.org/docs:contributing.
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940MQ 4.3.4                         01/30/2021                     ZMQ_UNBIND(3)