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d9b02e1697
Fixes #9320. for p in Shapovalov Chevalier Rozhkov Sievers Mack Herrmann Schmidt Rudenberg Sahani Landden Andersen Watanabe; do git grep -e 'Copyright.*'$p -l|xargs perl -i -0pe 's|/([*][*])?[*]\s+([*#]\s+)?Copyright[^\n]*'$p'[^\n]*\s*[*]([*][*])?/\n*|\n|gms; s|\s+([*#]\s+)?Copyright[^\n]*'$p'[^\n]*\n*|\n|gms' done
102 lines
4.3 KiB
XML
102 lines
4.3 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
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<!ENTITY % entities SYSTEM "custom-entities.ent" >
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%entities;
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]>
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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-->
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<refentry id="libudev"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>libudev</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>libudev</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>libudev</refname>
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<refpurpose>API for enumerating and introspecting local devices</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <libudev.h></funcsynopsisinfo>
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</funcsynopsis>
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<cmdsynopsis>
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<command>pkg-config --cflags --libs libudev</command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>libudev.h</filename> provides APIs to introspect
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and enumerate devices on the local system.</para>
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<para>All functions require a libudev context to operate. This
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context can be create via
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<citerefentry><refentrytitle>udev_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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It is used to track library state and link objects together. No
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global state is used by libudev, everything is always linked to
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a udev context. Furthermore, multiple different udev contexts can
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be used in parallel by multiple threads. However, a single context
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must not be accessed by multiple threads in parallel. The caller
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is responsible for providing suitable locking if they intend to use
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it from multiple threads.</para>
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<para>To introspect a local device on a system, a udev device
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object can be created via
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<citerefentry><refentrytitle>udev_device_new_from_syspath</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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and friends. The device object allows one to query current state,
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read and write attributes and lookup properties of the device in
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question.</para>
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<para>To enumerate local devices on the system, an enumeration
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object can be created via
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<citerefentry><refentrytitle>udev_enumerate_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
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<para>To monitor the local system for hotplugged or unplugged
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devices, a monitor can be created via
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<citerefentry><refentrytitle>udev_monitor_new_from_netlink</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
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<para>Whenever libudev returns a list of objects, the
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<citerefentry><refentrytitle>udev_list_entry</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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API should be used to iterate, access and modify those lists.</para>
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<para>Furthermore, libudev also exports legacy APIs that should
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not be used by new software (and as such are not documented as
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part of this manual). This includes the hardware database known
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as <constant>udev_hwdb</constant> (please use the new
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<citerefentry><refentrytitle>sd-hwdb</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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API instead) and the <constant>udev_queue</constant> object to
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query the udev daemon (which should not be used by new software
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at all).</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>udev_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>udev_device_new_from_syspath</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>udev_enumerate_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>udev_monitor_new_from_netlink</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>udev_list_entry</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-device</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-hwdb</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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