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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
<!ENTITY % entities SYSTEM "custom-entities.ent" >
%entities;
]>
<!--
SPDX-License-Identifier: LGPL-2.1+
Copyright 2015 David Herrmann <dh.herrmann@gmail.com>
-->
<refentry id="udev_new"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>udev_new</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>David</firstname>
<surname>Herrmann</surname>
<email>dh.herrmann@gmail.com</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>udev_new</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>udev_new</refname>
<refname>udev_ref</refname>
<refname>udev_unref</refname>
<refpurpose>Create, acquire and release a udev context object</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include <libudev.h></funcsynopsisinfo>
<funcprototype>
<funcdef>struct udev *<function>udev_new</function></funcdef>
<paramdef><parameter>void</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>struct udev *<function>udev_ref</function></funcdef>
<paramdef>struct udev *<parameter>udev</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>struct udev *<function>udev_unref</function></funcdef>
<paramdef>struct udev *<parameter>udev</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><function>udev_new()</function> allocates a new udev context
object and returns a pointer to it. This object is opaque and must
not be accessed by the caller via different means than functions
provided by libudev. Initially, the reference count of the context
is 1. You can acquire further references, and drop gained references
via <function>udev_ref()</function> and
<function>udev_unref()</function>. Once the reference count hits 0,
the context object is destroyed and freed.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>On success, <function>udev_new()</function> returns a pointer
to the allocated udev context. On failure, <constant>NULL</constant>
is returned. <function>udev_ref()</function> returns the argument
that it was passed, unmodified. <function>udev_unref()</function>
always returns <constant>NULL</constant>.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
</para>
</refsect1>
</refentry>
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