mirror of
https://github.com/systemd/systemd.git
synced 2024-11-04 22:21:55 +03:00
126 lines
5.2 KiB
XML
126 lines
5.2 KiB
XML
<?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 <libudev.h></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>
|