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4d933c28be
Make it explicit that the two functions are identical. Also document the expected disconnect behavior extensively and illustrate the difference between disconnecting a connected vs. bound endpoint.
123 lines
3.9 KiB
Plaintext
123 lines
3.9 KiB
Plaintext
zmq_disconnect(3)
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=================
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NAME
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----
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zmq_disconnect - Disconnect a socket from an endpoint
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SYNOPSIS
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--------
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*int zmq_disconnect (void '*socket', const char '*endpoint');*
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DESCRIPTION
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-----------
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The _zmq_disconnect()_ function shall disconnect a socket specified
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by the 'socket' argument from the endpoint specified by the 'endpoint'
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argument. Note the actual disconnect system call might occur at a later time.
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Upon disconnection the will also stop receiving messages originating from
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this endpoint. Moreover, the socket will no longuer be able
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to queue outgoing messages to this endpoint. The outgoing message queue
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associated with the endpoint will be discarded. However, if the socket's linger
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period is non-zero, libzmq will still attempt to transmit these discarded messages,
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until the linger period expires.
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Addionally, if the disconnected endpoint was previously connected to
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(as opposed to bound), the incoming message queue associated with the
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endpoint will be discarded. This means that after unbinding an endpoint
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using `disconnect`, it is possible to received messages originating
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from that same endpoint if they were already present in the incoming message
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queue before unbinding. However, this is not the case when disconnecting
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from a connected endpoint.
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The 'endpoint' argument is as described in linkzmq:zmq_connect[3]
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NOTE: The default setting of _ZMQ_LINGER_ does not discard unsent messages;
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this behaviour may cause the application to block when calling _zmq_ctx_term()_.
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For details refer to linkzmq:zmq_setsockopt[3] and linkzmq:zmq_ctx_term[3].
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Unbinding wild-card address from a socket
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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When a wild-card `*` 'endpoint' (described in linkzmq:zmq_tcp[7],
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linkzmq:zmq_ipc[7] and linkzmq:zmq_vmci[7]) was used in _zmq_bind()_, the caller
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should use the real 'endpoint' obtained from the ZMQ_LAST_ENDPOINT socket option
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to unbind this 'endpoint' from a socket.
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RETURN VALUE
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------------
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The _zmq_disconnect()_ 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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------
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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 provided endpoint is not in use by the socket.
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EXAMPLE
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-------
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.Connecting a subscriber socket to an in-process and 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_connect (socket, "tcp://server001:5555");
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assert (rc == 0);
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/* Disconnect from the previously connected endpoint */
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rc = zmq_disconnect (socket, "tcp://server001:5555");
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assert (rc == 0);
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----
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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_disconnect(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_disconnect (socket, buf);
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assert (rc == 0);
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----
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SEE ALSO
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--------
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linkzmq:zmq_connect[3]
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linkzmq:zmq_socket[3]
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linkzmq:zmq[7]
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AUTHORS
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-------
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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 <http://www.zeromq.org/docs:contributing>.
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