doc/zmq_connect.html

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<body>
<div id="header">
<h1>
zmq_connect(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>zmq_connect -
   connect a socket
</p>
</div>
</div>
<div id="content">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>int zmq_connect (void <em>*socket</em>, const char <em>*endpoint</em>);</strong></p></div>
</div>
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <em>zmq_connect()</em> function shall connect the socket referenced by the
<em>socket</em> argument to the endpoint specified by the <em>endpoint</em> argument.</p></div>
<div class="paragraph"><p>The <em>endpoint</em> argument is a string consisting of two parts as follows:
<em>transport</em><tt>://</tt><em>address</em>. The <em>transport</em> part specifies the underlying
transport protocol to use. The meaning of the <em>address</em> part is specific to
the underlying transport protocol selected.</p></div>
<div class="paragraph"><p>The following transports are defined:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
<em>inproc</em>
</dt>
<dd>
<p>
local in-process (inter-thread) communication transport, see <a href="zmq_inproc.html">zmq_inproc(7)</a>
</p>
</dd>
<dt class="hdlist1">
<em>ipc</em>
</dt>
<dd>
<p>
local inter-process communication transport, see <a href="zmq_ipc.html">zmq_ipc(7)</a>
</p>
</dd>
<dt class="hdlist1">
<em>tcp</em>
</dt>
<dd>
<p>
unicast transport using TCP, see <a href="zmq_tcp.html">zmq_tcp(7)</a>
</p>
</dd>
<dt class="hdlist1">
<em>pgm</em>, <em>epgm</em>
</dt>
<dd>
<p>
reliable multicast transport using PGM, see <a href="zmq_pgm.html">zmq_pgm(7)</a>
</p>
</dd>
</dl></div>
<div class="paragraph"><p>With the exception of <em>ZMQ_PAIR</em> sockets, a single socket may be connected to
multiple endpoints using <em>zmq_connect()</em>, while simultaneously accepting
incoming connections from multiple endpoints bound to the socket using
<em>zmq_bind()</em>. Refer to <a href="zmq_socket.html">zmq_socket(3)</a> for a description of the exact
semantics involved when connecting or binding a socket to multiple endpoints.</p></div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">The connection will not be performed immediately but as needed by ØMQ.
Thus a successful invocation of <em>zmq_connect()</em> does not indicate that a
physical connection was or can actually be established.</td>
</tr></table>
</div>
</div>
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <em>zmq_connect()</em> function shall return zero if successful. Otherwise it
shall return <tt>-1</tt> and set <em>errno</em> to one of the values defined below.</p></div>
</div>
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>EPROTONOSUPPORT</strong>
</dt>
<dd>
<p>
The requested <em>transport</em> protocol is not supported.
</p>
</dd>
<dt class="hdlist1">
<strong>ENOCOMPATPROTO</strong>
</dt>
<dd>
<p>
The requested <em>transport</em> protocol is not compatible with the socket type.
</p>
</dd>
<dt class="hdlist1">
<strong>ETERM</strong>
</dt>
<dd>
<p>
The ØMQ <em>context</em> associated with the specified <em>socket</em> was terminated.
</p>
</dd>
<dt class="hdlist1">
<strong>ENOTSOCK</strong>
</dt>
<dd>
<p>
The provided <em>socket</em> was invalid.
</p>
</dd>
<dt class="hdlist1">
<strong>EMTHREAD</strong>
</dt>
<dd>
<p>
No I/O thread is available to accomplish the task.
</p>
</dd>
</dl></div>
</div>
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="title">Connecting a subscriber socket to an in-process and a TCP transport</div>
<div class="content">
<pre><tt>/* Create a ZMQ_SUB socket */
void *socket = zmq_socket (context, ZMQ_SUB);
assert (socket);
/* Connect it to an in-process transport with the address 'my_publisher' */
int rc = zmq_connect (socket, "inproc://my_publisher");
assert (rc == 0);
/* Connect it to the host server001, port 5555 using a TCP transport */
rc = zmq_connect (socket, "tcp://server001:5555");
assert (rc == 0);</tt></pre>
</div></div>
</div>
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="zmq_bind.html">zmq_bind(3)</a>
<a href="zmq_socket.html">zmq_socket(3)</a>
<a href="zmq.html">zmq(7)</a></p></div>
</div>
<h2 id="_authors">AUTHORS</h2>
<div class="sectionbody">
<div class="paragraph"><p>This ØMQ manual page was written by Martin Sustrik &lt;<a href="mailto:sustrik@250bpm.com">sustrik@250bpm.com</a>&gt; and
Martin Lucina &lt;<a href="mailto:mato@kotelna.sk">mato@kotelna.sk</a>&gt;.</p></div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
ØMQ 2.1.6<br />
Last updated 2011-05-07 07:13:32 CEST
</div>
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