mirror of
https://github.com/systemd/systemd.git
synced 2024-11-23 18:23:32 +08:00
91 lines
2.8 KiB
XML
91 lines
2.8 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
|
|
<!ENTITY % entities SYSTEM "custom-entities.ent" >
|
|
%entities;
|
|
]>
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="udev_new"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>udev_new</title>
|
|
<productname>systemd</productname>
|
|
</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>History</title>
|
|
<para><function>udev_new()</function>,
|
|
<function>udev_ref()</function>, and
|
|
<function>udev_unref()</function> were added in version 221.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|