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-<h1>
-zmq_recv(3) Manual Page
-</h1>
-<h2>NAME</h2>
-<div class="sectionbody">
-<p>zmq_recv -
- receive a message from a socket
-</p>
-</div>
-</div>
-<div id="content">
-<h2 id="_synopsis">SYNOPSIS</h2>
-<div class="sectionbody">
-<div class="paragraph"><p><strong>int zmq_recv (void <em>*socket</em>, zmq_msg_t <em>*msg</em>, int <em>flags</em>);</strong></p></div>
-</div>
-<h2 id="_description">DESCRIPTION</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The <em>zmq_recv()</em> function shall receive a message from the socket referenced by
-the <em>socket</em> argument and store it in the message referenced by the <em>msg</em>
-argument. Any content previously stored in <em>msg</em> shall be properly deallocated.
-If there are no messages available on the specified <em>socket</em> the <em>zmq_recv()</em>
-function shall block until the request can be satisfied. The <em>flags</em> argument
-is a combination of the flags defined below:</p></div>
-<div class="dlist"><dl>
-<dt class="hdlist1">
-<strong>ZMQ_NOBLOCK</strong>
-</dt>
-<dd>
-<p>
-Specifies that the operation should be performed in non-blocking mode. If there
-are no messages available on the specified <em>socket</em>, the <em>zmq_recv()</em> function
-shall fail with <em>errno</em> set to EAGAIN.
-</p>
-</dd>
-</dl></div>
-<h3 id="_multi_part_messages">Multi-part messages</h3><div style="clear:left"></div>
-<div class="paragraph"><p>A ØMQ message is composed of 1 or more message parts; each message part is an
-independent <em>zmq_msg_t</em> in its own right. ØMQ ensures atomic delivery of
-messages; peers shall receive either all <em>message parts</em> of a message or none
-at all.</p></div>
-<div class="paragraph"><p>The total number of message parts is unlimited.</p></div>
-<div class="paragraph"><p>An application wishing to determine if a message is composed of multiple parts
-does so by retrieving the value of the <em>ZMQ_RCVMORE</em> socket option on the
-<em>socket</em> it is receiving the message from. If there are no message parts to
-follow, or if the message is not composed of multiple parts, <em>ZMQ_RCVMORE</em>
-shall report a value of zero. Otherwise, <em>ZMQ_RCVMORE</em> shall report a value of
-1, indicating that more message parts are to follow.</p></div>
-</div>
-<h2 id="_return_value">RETURN VALUE</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The <em>zmq_recv()</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>EAGAIN</strong>
-</dt>
-<dd>
-<p>
-Non-blocking mode was requested and no messages are available at the moment.
-</p>
-</dd>
-<dt class="hdlist1">
-<strong>ENOTSUP</strong>
-</dt>
-<dd>
-<p>
-The <em>zmq_recv()</em> operation is not supported by this socket type.
-</p>
-</dd>
-<dt class="hdlist1">
-<strong>EFSM</strong>
-</dt>
-<dd>
-<p>
-The <em>zmq_recv()</em> operation cannot be performed on this socket at the moment due
-to the socket not being in the appropriate state. This error may occur with
-socket types that switch between several states, such as ZMQ_REP. See the
-<em>messaging patterns</em> section of <a href="zmq_socket.html">zmq_socket(3)</a> for more information.
-</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>EFAULT</strong>
-</dt>
-<dd>
-<p>
-The provided <em>socket</em> was not valid (NULL).
-</p>
-</dd>
-</dl></div>
-</div>
-<h2 id="_example">EXAMPLE</h2>
-<div class="sectionbody">
-<div class="listingblock">
-<div class="title">Receiving a message from a socket</div>
-<div class="content">
-<pre><tt>/* Create an empty 0MQ message */
-zmq_msg_t msg;
-int rc = zmq_msg_init (&msg);
-assert (rc == 0);
-/* Block until a message is available to be received from socket */
-rc = zmq_recv (socket, &msg, 0);
-assert (rc == 0);
-/* Release message */
-zmq_msg_close (&msg);</tt></pre>
-</div></div>
-<div class="listingblock">
-<div class="title">Receiving a multi-part message</div>
-<div class="content">
-<pre><tt>int64_t more;
-size_t more_size = sizeof more;
-do {
- /* Create an empty 0MQ message to hold the message part */
- zmq_msg_t part;
- int rc = zmq_msg_init (&part);
- assert (rc == 0);
- /* Block until a message is available to be received from socket */
- rc = zmq_recv (socket, &part, 0);
- assert (rc == 0);
- /* Determine if more message parts are to follow */
- rc = zmq_getsockopt (socket, ZMQ_RCVMORE, &more, &more_size);
- assert (rc == 0);
- zmq_msg_close (&part);
-} while (more);</tt></pre>
-</div></div>
-</div>
-<h2 id="_see_also">SEE ALSO</h2>
-<div class="sectionbody">
-<div class="paragraph"><p><a href="zmq_send.html">zmq_send(3)</a>
-<a href="zmq_getsockopt.html">zmq_getsockopt(3)</a>
-<a href="zmq_socket.html">zmq_socket(7)</a>
-<a href="zmq.html">zmq(7)</a></p></div>
-</div>
-<h2 id="_authors">AUTHORS</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The ØMQ documentation was written by Martin Sustrik <<a href="mailto:sustrik@250bpm.com">sustrik@250bpm.com</a>> and
-Martin Lucina <<a href="mailto:mato@kotelna.sk">mato@kotelna.sk</a>>.</p></div>
-</div>
-</div>
-<div id="footnotes"><hr /></div>
-<div id="footer">
-<div id="footer-text">
-ØMQ 2.0.10<br />
-Last updated 2010-10-15 19:40:36 CEST
-</div>
-</div>
-</body>
-</html>
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