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<a href="../python-systemd/index.html">Python </a>·
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<span style="float:right">systemd 221</span><hr><div class="refentry"><a name="udev_new"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>udev_new, udev_ref, udev_unref — Create, acquire and release a udev context object</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <libudev.h></pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">struct udev *<b class="fsfunc">udev_new</b>(</code></td><td><var class="pdparam">void</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">struct udev *<b class="fsfunc">udev_ref</b>(</code></td><td>struct udev *<var class="pdparam">udev</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">struct udev *<b class="fsfunc">udev_unref</b>(</code></td><td>struct udev *<var class="pdparam">udev</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm47061763469584"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="function">udev_new()</code> allocates a new udev context
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object and returns a pointer to it. This object is opaque and must
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not be accessed by the caller via different means than functions
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provided by libudev. Initially, the reference count of the context
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is 1. You can acquire further references, and drop gained references
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via <code class="function">udev_ref()</code> and
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<code class="function">udev_unref()</code>. Once the reference count hits 0,
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the context object is destroyed and freed.</p></div><div class="refsect1"><a name="idm47061763466352"></a><h2 id="Return Value">Return Value<a class="headerlink" title="Permalink to this headline" href="#Return%20Value">¶</a></h2><p>On success, <code class="function">udev_new()</code> returns a pointer
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to the allocated udev context. On failure, <code class="constant">NULL</code>
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is returned. <code class="function">udev_ref()</code> returns the argument
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that it was passed, unmodified. <code class="function">udev_unref()</code>
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always returns <code class="constant">NULL</code>.</p></div><div class="refsect1"><a name="idm47061763462560"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
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<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
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</p></div></div></body></html>
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