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---
version: tip
layout: manpage_v2
title: nng_dialer(5)
---
<h1>nng_dialer(5)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_dialer - dialer</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="c"><span></span><span class="tok-cp">#include</span><span class="tok-w"> </span><span class="tok-cpf"><nng/nng.h></span>
<span class="tok-k">typedef</span><span class="tok-w"> </span><span class="tok-k">struct</span><span class="tok-w"> </span><span class="tok-nc">nng_dialer_s</span><span class="tok-w"> </span><span class="tok-n">nng_dialer</span><span class="tok-p">;</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>
An <code>nng_dialer</code> is a handle to a dialer object, which is responsible for
creating a single <a href="nng_pipe.5.html"><code>nng_pipe</code></a> at a time by
establishing an outgoing connection.</p>
</div>
<div class="paragraph">
<p>If the connection is broken, or fails, the dialer object will automatically
attempt to reconnect, and will keep doing so until the dialer or socket is
destroyed.</p>
</div>
<div class="paragraph">
<p>Dialer objects are created by the
<a href="nng_dialer_create.3.html"><code>nng_dialer_create()</code></a>
or <a href="nng_dial.3.html"><code>nng_dial()</code></a> functions, and are always associated
with a single <a href="nng_socket.5.html"><code>nng_socket</code></a>.</p>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
The <code>nng_dialer</code> structure is always passed by value (both
for input parameters and return values), and should be treated opaquely.
Passing structures this way gives the compiler a chance to perform
accurate type checks in functions passing values of this type.
</td>
</tr>
</table>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
A given <a href="nng_socket.5.html"><code>nng_socket</code></a> may have multiple dialer
objects, multiple <a href="nng_listener.5.html">listener</a> objects, or even some
of both.
</td>
</tr>
</table>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
The client/server relationship described by dialer/listener is
completely orthogonal to any similar relationship in the protocols.
For example, a <a href="nng_rep.7.html"><em>rep</em></a> socket may use a dialer
to connect to a listener on an <a href="nng_req.7.html"><em>req</em></a> socket.
This orthogonality can lead to innovative solutions to otherwise
challenging communications problems.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Dialer objects may be destroyed by the
<a href="nng_dialer_close.3.html"><code>nng_dialer_close()</code></a> function.
They are also closed when their associated socket is closed.</p>
</div>
<div class="sect2">
<h3 id="NNG_DIALER_INITIALIZER">Initialization</h3>
<div class="paragraph">
<p>A dialer may be initialized using the macro <code>NNG_DIALER_INITIALIZER</code>
before it is opened, to prevent confusion with valid open dialers.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph text-left">
<p><a href="nng_dial.3.html">nng_dial(3)</a>,
<a href="nng_dialer_close.3.html">nng_dialer_close(3)</a>,
<a href="nng_dialer_create.3.html">nng_dialer_create(3)</a>,
<a href="nng_dialer_getopt.3.html">nng_dialer_getopt(3)</a>,
<a href="nng_dialer_id.3.html">nng_dialer_id(3)</a>,
<a href="nng_dialer_setopt.3.html">nng_dialer_setopt(3)</a>,
<a href="nng_dialer_start.3.html">nng_dialer_start(3)</a>,
<a href="nng_listener.5.html">nng_listener(5)</a>,
<a href="nng_pipe.5.html">nng_pipe(5)</a>,
<a href="nng_socket.5.html">nng_socket(5)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
</div>
</div>
|
