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94 lines
2.9 KiB
Plaintext
94 lines
2.9 KiB
Plaintext
= zmq_unbind(3)
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== NAME
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zmq_unbind - Stop accepting connections on a socket
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== SYNOPSIS
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int zmq_unbind (void '*socket', const char '*endpoint');
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== DESCRIPTION
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The _zmq_unbind()_ function shall unbind a socket specified
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by the 'socket' argument from the endpoint specified by the 'endpoint'
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argument.
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Additionally the incoming message queue associated with the endpoint will be
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discarded. This means that after unbinding an endpoint it is possible to
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received messages originating from that same endpoint if they were already
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present in the incoming message queue before unbinding.
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The 'endpoint' argument is as described in xref:zmq_bind.adoc[zmq_bind]
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Unbinding wild-card address from a socket
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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When wild-card `*` 'endpoint' (described in xref:zmq_tcp.adoc[zmq_tcp],
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xref:zmq_ipc.adoc[zmq_ipc], xref:zmq_udp.adoc[zmq_udp] and xref:zmq_vmci.adoc[zmq_vmci]) was used in
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_zmq_bind()_, the caller should use real 'endpoint' obtained from the
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ZMQ_LAST_ENDPOINT socket option to unbind this 'endpoint' from a socket.
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== RETURN VALUE
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The _zmq_unbind()_ function shall return zero if successful. Otherwise it
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shall return `-1` and set 'errno' to one of the values defined below.
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== ERRORS
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*EINVAL*::
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The endpoint supplied is invalid.
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*ETERM*::
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The 0MQ 'context' associated with the specified 'socket' was terminated.
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*ENOTSOCK*::
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The provided 'socket' was invalid.
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*ENOENT*::
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The endpoint supplied was not previously bound.
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== EXAMPLES
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.Unbind a subscriber socket from a TCP transport
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----
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/* Create a ZMQ_SUB socket */
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void *socket = zmq_socket (context, ZMQ_SUB);
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assert (socket);
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/* Connect it to the host server001, port 5555 using a TCP transport */
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rc = zmq_bind (socket, "tcp://127.0.0.1:5555");
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assert (rc == 0);
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/* Disconnect from the previously connected endpoint */
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rc = zmq_unbind (socket, "tcp://127.0.0.1:5555");
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assert (rc == 0);
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----
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.Unbind wild-card `*` binded socket
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----
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/* Create a ZMQ_SUB socket */
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void *socket = zmq_socket (context, ZMQ_SUB);
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assert (socket);
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/* Bind it to the system-assigned ephemeral port using a TCP transport */
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rc = zmq_bind (socket, "tcp://127.0.0.1:*");
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assert (rc == 0);
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/* Obtain real endpoint */
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const size_t buf_size = 32;
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char buf[buf_size];
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rc = zmq_getsockopt (socket, ZMQ_LAST_ENDPOINT, buf, (size_t *)&buf_size);
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assert (rc == 0);
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/* Unbind socket by real endpoint */
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rc = zmq_unbind (socket, buf);
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assert (rc == 0);
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----
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== NOTE
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Note that while the implementation is similar to _zmq_disconnect()_, the
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semantics are different and the two functions should not be used
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interchangeably. Bound sockets should be unbound, and connected sockets should
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be disconnected.
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== SEE ALSO
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* xref:zmq_bind.adoc[zmq_bind]
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* xref:zmq_socket.adoc[zmq_socket]
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* xref:zmq.adoc[zmq]
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== AUTHORS
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This page was written by the 0MQ community. To make a change please
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read the 0MQ Contribution Policy at <https://zeromq.org/how-to-contribute/>.
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