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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;
]>
<!--
This file is part of systemd.
Copyright 2015 David Herrmann <dh.herrmann@gmail.com>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<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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