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<body class="manpage">
<div id="header">
<h1>
zmq_msg_init_data(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>zmq_msg_init_data -
initialise 0MQ message from a supplied buffer
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>typedef void (zmq_free_fn) (void <em>*data</em>, void <em>*hint</em>);</strong></p></div>
<div class="paragraph"><p><strong>int zmq_msg_init_data (zmq_msg_t <em>*msg</em>, void <em>*data</em>, size_t <em>size</em>, zmq_free_fn <em>*ffn</em>, void <em>*hint</em>);</strong></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <em>zmq_msg_init_data()</em> function shall initialise the message object
referenced by <em>msg</em> to represent the content referenced by the buffer located
at address <em>data</em>, <em>size</em> bytes long. No copy of <em>data</em> shall be performed and
ØMQ shall take ownership of the supplied buffer.</p></div>
<div class="paragraph"><p>If provided, the deallocation function <em>ffn</em> shall be called once the data
buffer is no longer required by ØMQ, with the <em>data</em> and <em>hint</em> arguments
supplied to <em>zmq_msg_init_data()</em>.</p></div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">Never access <em>zmq_msg_t</em> members directly, instead always use the
<em>zmq_msg</em> family of functions.</td>
</tr></table>
</div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">The deallocation function <em>ffn</em> needs to be thread-safe, since it
will be called from an arbitrary thread.</td>
</tr></table>
</div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">The functions <em>zmq_msg_init()</em>, <em>zmq_msg_init_data()</em> and
<em>zmq_msg_init_size()</em> are mutually exclusive. Never initialize the same
<em>zmq_msg_t</em> twice.</td>
</tr></table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <em>zmq_msg_init_data()</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>
</div>
<div class="sect1">
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>ENOMEM</strong>
</dt>
<dd>
<p>
Insufficient storage space is available.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="title">Initialising a message from a supplied buffer</div>
<div class="content">
<pre><tt>void my_free (void *data, void *hint)
{
free (data);
}
/* ... */
void *data = malloc (6);
assert (data);
memcpy (data, "ABCDEF", 6);
zmq_msg_t msg;
rc = zmq_msg_init_data (&msg, data, 6, my_free, NULL);
assert (rc == 0);</tt></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_msg_init_size.html">zmq_msg_init_size(3)</a>
<a href="zmq_msg_init.html">zmq_msg_init(3)</a>
<a href="zmq_msg_close.html">zmq_msg_close(3)</a>
<a href="zmq_msg_data.html">zmq_msg_data(3)</a>
<a href="zmq_msg_size.html">zmq_msg_size(3)</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 4.0.4<br />
Last updated 2013-11-13 12:57:50 EST
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