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<section id="geopm-daemon-3-geopm-daemon-helper-methods">
<h1>geopm::Daemon(3) – GEOPM daemon helper methods<a class="headerlink" href="#geopm-daemon-3-geopm-daemon-helper-methods" title="Link to this heading"></a></h1>
<section id="namespaces">
<h2>Namespaces<a class="headerlink" href="#namespaces" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">Daemon</span></code> class is a member of the <code class="docutils literal notranslate"><span class="pre">namespace</span> <span class="pre">geopm</span></code>, but the
full name, <code class="docutils literal notranslate"><span class="pre">geopm::Daemon</span></code>, has been abbreviated in this manual.
Similarly, the <code class="docutils literal notranslate"><span class="pre">std::</span></code> namespace specifier has been omitted from the
interface definitions for the following standard types: <code class="docutils literal notranslate"><span class="pre">std::vector</span></code>,
<code class="docutils literal notranslate"><span class="pre">std::string</span></code>, and <code class="docutils literal notranslate"><span class="pre">std::set</span></code>, to enable better rendering of this
manual.</p>
<p>Note that the <code class="docutils literal notranslate"><span class="pre">Daemon</span></code> class is an abstract base class. There is one
concrete implementation, <code class="docutils literal notranslate"><span class="pre">DaemonImp</span></code>.</p>
</section>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Link to this heading"></a></h2>
<p>#include <a class="reference external" href="https://github.com/geopm/geopm/blob/dev/libgeopm/include/Daemon.hpp"><geopm/Daemon.hpp></a></p>
<p>Link with <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(MPI)</strong> or <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(non-MPI)</strong></p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Daemon::update_endpoint_from_policystore</span><span class="p">(</span><span class="kt">double</span><span class="w"> </span><span class="n">timeout</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Daemon::stop_wait_loop</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Daemon::reset_wait_loop</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">static</span><span class="w"> </span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">Daemon</span><span class="o">></span><span class="w"> </span><span class="n">Daemon</span><span class="o">::</span><span class="n">make_unique</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">endpoint_name</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">db_path</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">Daemon</span></code> class is the underlying <strong>C++</strong> implementation for the
<a class="reference internal" href="geopm_daemon.3.html"><span class="doc">geopm_daemon(3)</span></a> <strong>C</strong> interface. Please refer to the
<a class="reference internal" href="geopm_daemon.3.html"><span class="doc">geopm_daemon(3)</span></a> man page for a general description of the
purpose, goals, and use cases for this interface.</p>
</section>
<section id="factory-method">
<h2>Factory Method<a class="headerlink" href="#factory-method" title="Link to this heading"></a></h2>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">make_unique()</span></code>:
This method returns a <code class="docutils literal notranslate"><span class="pre">unique_ptr<Daemon></span></code> to a concrete <code class="docutils literal notranslate"><span class="pre">DaemonImp</span></code>
object. The shared memory prefix for the Endpoint should be given
in <em>endpoint_name</em>. The path to the PolicyStore should be given
in <em>db_path</em>.</p></li>
</ul>
</section>
<section id="class-methods">
<h2>Class Methods<a class="headerlink" href="#class-methods" title="Link to this heading"></a></h2>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">update_endpoint_from_policystore()</span></code>:
Looks up a policy in the Daemon’s PolicyStore given the attached
Controller’s agent and profile name, and writes it back into the
policy side of the Daemon’s Endpoint. If no policy is found, an
error is returned. If the Controller fails to attach within the
<em>timeout</em>, or detaches while this function is running, no policy
is written.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">stop_wait_loop()</span></code>:
Exits early from any ongoing wait loops in the Daemon, for example
in a call to <code class="docutils literal notranslate"><span class="pre">update_endpoint_from_policystore()</span></code>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">reset_wait_loop()</span></code>:
Resets the Daemon’s endpoint to prepare for a future wait loop.</p></li>
</ul>
</section>
<section id="errors">
<h2>Errors<a class="headerlink" href="#errors" title="Link to this heading"></a></h2>
<p>All functions described on this man page throw <a class="reference internal" href="geopm%3A%3AException.3.html"><span class="doc">geopm::Exception(3)</span></a>
on error.</p>
</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Link to this heading"></a></h2>
<p><a class="reference internal" href="geopm.7.html"><span class="doc">geopm(7)</span></a>,
<a class="reference internal" href="geopm_daemon.3.html"><span class="doc">geopm_daemon(3)</span></a></p>
</section>
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