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<body class="manpage">
<div id="header">
<h1>
zmq_recvmsg(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>zmq_recvmsg -
receive a message part from a socket
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>int zmq_recvmsg (void <em>*socket</em>, zmq_msg_t <em>*msg</em>, int <em>flags</em>);</strong></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <em>zmq_recvmsg()</em> function shall receive a message part 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 message parts available on the specified <em>socket</em>
the <em>zmq_recvmsg()</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_DONTWAIT</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_recvmsg()</em>
function shall fail with <em>errno</em> set to EAGAIN.
</p>
</dd>
</dl></div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">this API method is deprecated in favor of zmq_msg_recv(3).</td>
</tr></table>
</div>
<div class="sect2">
<h3 id="_multi_part_messages">Multi-part messages</h3>
<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. The total number of message parts is unlimited except
by available memory.</p></div>
<div class="paragraph"><p>An application that processes multi-part messages must use the <em>ZMQ_RCVMORE</em>
<a href="zmq_getsockopt.html">zmq_getsockopt(3)</a> option after calling <em>zmq_recvmsg()</em> to determine if
there are further parts to receive.</p></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <em>zmq_recvmsg()</em> function shall return number of bytes in the message
if successful. Otherwise it shall return <code>-1</code> and set <em>errno</em> to one of the
values defined below.</p></div>
</div>
</div>
<div class="sect1">
<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_recvmsg()</em> operation is not supported by this socket type.
</p>
</dd>
<dt class="hdlist1">
<strong>EFSM</strong>
</dt>
<dd>
<p>
The <em>zmq_recvmsg()</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>ENOTSOCK</strong>
</dt>
<dd>
<p>
The provided <em>socket</em> was invalid.
</p>
</dd>
<dt class="hdlist1">
<strong>EINTR</strong>
</dt>
<dd>
<p>
The operation was interrupted by delivery of a signal before a message was
available.
</p>
</dd>
<dt class="hdlist1">
<strong>EFAULT</strong>
</dt>
<dd>
<p>
The message passed to the function was invalid.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<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><code>/* 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_recvmsg (socket, &msg, 0);
assert (rc != -1);
/* Release message */
zmq_msg_close (&msg);</code></pre>
</div></div>
<div class="listingblock">
<div class="title">Receiving a multi-part message</div>
<div class="content">
<pre><code>int 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_recvmsg (socket, &part, 0);
assert (rc != -1);
/* 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);</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="zmq_recv.html">zmq_recv(3)</a>
<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>
</div>
<div class="sect1">
<h2 id="_authors">AUTHORS</h2>
<div class="sectionbody">
<div class="paragraph"><p>This page was written by the ØMQ community. To make a change please
read the ØMQ Contribution Policy at <a href="http://www.zeromq.org/docs:contributing">http://www.zeromq.org/docs:contributing</a>.</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
ØMQ 4.3.1<br />
Last updated 2019-01-12 16:17:39 UTC
</div>
</div>
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