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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="libudev"
- xmlns:xi="http://www.w3.org/2001/XInclude">
-
- <refentryinfo>
- <title>libudev</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>libudev</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>libudev</refname>
- <refpurpose>API for enumerating and introspecting local devices</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;libudev.h&gt;</funcsynopsisinfo>
- </funcsynopsis>
-
- <cmdsynopsis>
- <command>pkg-config --cflags --libs libudev</command>
- </cmdsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><filename>libudev.h</filename> provides APIs to introspect
- and enumerate devices on the local system.</para>
-
- <para>All functions require a libudev context to operate. This
- context can be create via
- <citerefentry><refentrytitle>udev_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
- It is used to track library state and link objects together. No
- global state is used by libudev, everything is always linked to
- a udev context. Furthermore, multiple different udev contexts can
- be used in parallel by multiple threads. However, a single context
- must not be accessed by multiple threads in parallel. The caller
- is responsible for providing suitable locking if they intend to use
- it from multiple threads.</para>
-
- <para>To introspect a local device on a system, a udev device
- object can be created via
- <citerefentry><refentrytitle>udev_device_new_from_syspath</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- and friends. The device object allows one to query current state,
- read and write attributes and lookup properties of the device in
- question.</para>
-
- <para>To enumerate local devices on the system, an enumeration
- object can be created via
- <citerefentry><refentrytitle>udev_enumerate_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
-
- <para>To monitor the local system for hotplugged or unplugged
- devices, a monitor can be created via
- <citerefentry><refentrytitle>udev_monitor_new_from_netlink</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
-
- <para>Whenever libudev returns a list of objects, the
- <citerefentry><refentrytitle>udev_list_entry</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- API should be used to iterate, access and modify those lists.</para>
-
- <para>Furthermore, libudev also exports legacy APIs that should
- not be used by new software (and as such are not documented as
- part of this manual). This includes the hardware database known
- as <constant>udev_hwdb</constant> (please use the new
- <citerefentry><refentrytitle>sd-hwdb</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- API instead) and the <constant>udev_queue</constant> object to
- query the udev daemon (which should not be used by new software
- at all).</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>udev_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>udev_device_new_from_syspath</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>udev_enumerate_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>udev_monitor_new_from_netlink</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>udev_list_entry</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd-device</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd-hwdb</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>