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</head>
<body class="manpage">
<div id="header">
<h1>nn_get_statistic(3) Manual Page</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>nn_get_statistic - retrieve statistics from nanomsg socket</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph">
<p><strong>#include &lt;nanomsg/nn.h&gt;</strong></p>
</div>
<div class="paragraph">
<p><strong>uint64_t *nn_get_statistic (int <em>s</em>, int <em>statistic</em>);</strong></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Retrieves the value of a statistic from the socket.</p>
</div>
<div class="admonitionblock caution">
<table>
<tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">
While this API is stable, these statistics are intended for
human consumption, to facilitate observability and debugging.
The actual statistics themselves as well as their meanings are unstable,
and subject to change without notice.
Programs should not depend on the presence or values of any particular
statistic.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The following statistics are maintained by the nanomsg core framework;
others may be present. As those are undocumented, no interpretration should
be made from them. Not all statistics are relevant to all transports.
For example, the <a href="nn_inproc.7.html">nn_inproc(7)</a> transport does not
maintain any of the connection related statistics.</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1"><strong>NN_STAT_ESTABLISHED_CONNECTIONS</strong></dt>
<dd>
<p>The number of connections successfully established that were initiated
from this socket.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_ACCEPTED_CONNECTIONS</strong></dt>
<dd>
<p>The number of connections successfully established that were accepted
by this socket.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_DROPPED_CONNECTIONS</strong></dt>
<dd>
<p>The number of established connections that were dropped by this socket.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_BROKEN_CONNECTIONS</strong></dt>
<dd>
<p>The number of established connections that were closed by this socket,
typically due to protocol errors.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_CONNECT_ERRORS</strong></dt>
<dd>
<p>The number of errors encountered by this socket trying to connect to
a remote peer.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_BIND_ERRORS</strong></dt>
<dd>
<p>The number of errors encountered by this socket trying to bind to
a local address.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_ACCEPT_ERRORS</strong></dt>
<dd>
<p>The number of errors encountered by this socket trying to accept a
a connection from a remote peer.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_CURRENT_CONNECTIONS</strong></dt>
<dd>
<p>The number of connections currently estabalished to this socket.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_MESSAGES_SENT</strong></dt>
<dd>
<p>The number messages sent by this socket.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_MESSAGES_RECEIVED</strong></dt>
<dd>
<p>The number messages received by this socket.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_BYTES_SENT</strong></dt>
<dd>
<p>The number of bytes sent by this socket.</p>
</dd>
<dt class="hdlist1"><strong>NN_STAT_BYTES_RECEIVED</strong></dt>
<dd>
<p>The number of bytes received by this socket.</p>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph">
<p>On success, the value of the statistic is returned, otherwise (uint64_t)-1
is returned.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="dlist">
<dl>
<dt class="hdlist1"><strong>EINVAL</strong></dt>
<dd>
<p>The statistic is invalid or unsupported.</p>
</dd>
<dt class="hdlist1"><strong>EBADF</strong></dt>
<dd>
<p>The provided socket is invalid.</p>
</dd>
<dt class="hdlist1"><strong>ETERM</strong></dt>
<dd>
<p>The library is terminating.</p>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre>val = nn_get_statistic (s, NN_STAT_SENT_MESSAGES);
if (val == 0)
printf ("No messages have been sent yet.\n");</pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="nn_errno.3.html">nn_errno(3)</a>
<a href="nn_symbol.3.html">nn_symbol(3)</a>
<a href="nanomsg.7.html">nanomsg(7)</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_authors">AUTHORS</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="mailto:garrett@damore.org">Garrett D&#8217;Amore</a></p>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
nanomsg 1.0.0-rc1<br>
Last updated 2016-06-03 09:44:18 PDT
</div>
</div>
</body>