mirror of
https://git.linuxfromscratch.org/lfs.git
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94aa662138
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@7236 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
217 lines
7.5 KiB
XML
217 lines
7.5 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-system-udev" role="wrap">
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<title>Udev-&udev-version;</title>
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<?dbhtml filename="udev.html"?>
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<indexterm zone="ch-system-udev"><primary sortas="a-Udev">Udev</primary></indexterm>
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<sect2 role="package"><title/>
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<para>The Udev package contains programs for dynamic creation of device nodes.</para>
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<segmentedlist>
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<segtitle>&buildtime;</segtitle>
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<segtitle>&diskspace;</segtitle>
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<seglistitem><seg>0.1 SBU</seg><seg>3.8 MB</seg></seglistitem>
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</segmentedlist>
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<segmentedlist>
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<segtitle>&dependencies;</segtitle>
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<seglistitem><seg>Coreutils and Make</seg></seglistitem>
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</segmentedlist>
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</sect2>
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<sect2 role="installation">
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<title>Installation of Udev</title>
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<para>Compile the package:</para>
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<screen><userinput>make EXTRAS=extras/run_directory</userinput></screen>
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<para>The meaning of the make option:</para>
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<variablelist>
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<varlistentry>
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<term><parameter>EXTRAS=extras/run_directory</parameter>
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</term>
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<listitem>
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<para>This builds the <command>udev_run_devd</command> and
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<command>udev_run_hotplugd</command> binaries, which are required for
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correct handling of hotpluggable devices.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>To test the results, issue:
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<userinput>make test</userinput>.</para>
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<para>Install the package:</para>
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<screen><userinput>make DESTDIR=/ EXTRAS=extras/run_directory install</userinput></screen>
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<para>The meaning of the make option:</para>
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<variablelist>
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<varlistentry>
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<term><parameter>DESTDIR=/</parameter>
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</term>
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<listitem>
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<para>This prevents the Udev build process from killing any
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<command>udevd</command> processes that may be running on the host
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system.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>Udev's configuration is far from ideal by default, so install
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the configuration files here:</para>
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<screen><userinput>cp -v ../&udev-config-file; /etc/udev/rules.d/25-lfs.rules</userinput></screen>
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<para>Install the documentation that explains how to create Udev rules:</para>
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<screen><userinput>install -m644 -D -v docs/writing_udev_rules/index.html /usr/share/doc/udev-&udev-version;/index.html</userinput></screen>
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<!-- Edit Me -->
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<para>Run the <command>udevstart</command> program to create our full
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complement of device nodes.</para>
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<screen><userinput>/sbin/udevstart</userinput></screen>
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</sect2>
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<sect2 id="contents-udev" role="content"><title>Contents of Udev</title>
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<segmentedlist>
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<segtitle>Installed programs</segtitle>
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<segtitle>Installed directory</segtitle>
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<seglistitem><seg>udev, udev_run_devd, udev_run_hotplugd, udevcontrol, udevd,
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udevinfo, udevmonitor, udevsend, udevstart, and udevtest</seg>
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<seg>/etc/udev</seg></seglistitem>
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</segmentedlist>
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<variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<?dbhtml list-presentation="table"?>
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<varlistentry id="udev">
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<term><command>udev</command></term>
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<listitem>
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<para>Creates device nodes in <filename
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class="directory">/dev</filename> or renames network interfaces (not
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in LFS) in response to hotplug events</para>
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<indexterm zone="ch-system-udev udev"><primary sortas="b-udev">udev</primary></indexterm>
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</listitem></varlistentry>
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<varlistentry id="udev_run_devd">
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<term><command>udev_run_devd</command></term>
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<listitem>
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<para>Executes programs and scripts in the
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<filename class="directory">/etc/dev.d/</filename> directory in response
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to hotplug events
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</para>
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<indexterm zone="ch-system-udev udev_run_devd">
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<primary sortas="b-udev_run_devd">udev_run_devd</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="udev_run_hotplugd">
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<term><command>udev_run_hotplugd</command></term>
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<listitem>
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<para>Executes programs and scripts in the
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<filename class="directory">/etc/hotplug.d/</filename> directory in
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response to hotplug events
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</para>
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<indexterm zone="ch-system-udev udev_run_hotplugd">
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<primary sortas="b-udev_run_hotplugd">udev_run_hotplugd</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="udevcontrol">
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<term><command>udevcontrol</command></term>
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<listitem>
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<para>Configures a number of options for the running <command>udevd</command>
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daemon, such as the log level.</para>
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<indexterm zone="ch-system-udev udevcontrol"><primary sortas="b-udevcontrol">udevcontrol</primary>
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</indexterm>
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</listitem></varlistentry>
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<varlistentry id="udevd">
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<term><command>udevd</command></term>
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<listitem>
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<para>A daemon that reorders hotplug events before submitting them to
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<command>udev</command>,
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thus avoiding various race conditions</para>
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<indexterm zone="ch-system-udev udevd"><primary sortas="b-udevd">udevd</primary></indexterm>
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</listitem></varlistentry>
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<varlistentry id="udevinfo">
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<term><command>udevinfo</command></term>
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<listitem>
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<para>Allows users to query the <command>udev</command> database for
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information on any device currently present on the system; it also
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provides a way to query any device in the <systemitem
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class="filesystem">sysfs</systemitem> tree to help create udev
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rules</para>
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<indexterm zone="ch-system-udev udevinfo"><primary sortas="b-udevinfo">udevinfo</primary></indexterm>
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</listitem></varlistentry>
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<varlistentry id="udevmonitor">
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<term><command>udevmonitor</command></term>
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<listitem>
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<para>Prints the event received from the kernel and the event which
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<command>udev</command> sends out after rule processing</para>
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<indexterm zone="ch-system-udev udevmonitor"><primary sortas="b-udevmonitor">udevmonitor</primary>
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</indexterm>
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</listitem></varlistentry>
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<varlistentry id="udevsend">
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<term><command>udevsend</command></term>
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<listitem>
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<para>Delivers hotplug events to <command>udevd</command></para>
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<indexterm zone="ch-system-udev udevsend"><primary sortas="b-udevsend">udevsend</primary></indexterm>
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</listitem></varlistentry>
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<varlistentry id="udevstart">
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<term><command>udevstart</command></term>
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<listitem>
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<para>Creates device nodes in <filename
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class="directory">/dev</filename> that correspond to drivers compiled directly
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into the kernel; it performs that task by simulating hotplug events presumably
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dropped by the kernel before invocation of this program (e.g., because the root
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filesystem has not been mounted) and submitting such synthetic hotplug events
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to <command>udev</command></para>
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<indexterm zone="ch-system-udev udevstart"><primary sortas="b-udevstart">udevstart</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="udevtest">
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<term><command>udevtest</command></term>
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<listitem>
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<para>Simulates a <command>udev</command> run for the given device,
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and prints out the name of the node the real <command>udev</command> would
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have created or (not in LFS) the name of the renamed network interface</para>
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<indexterm zone="ch-system-udev udevtest"><primary sortas="b-udevtest">udevtest</primary></indexterm>
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</listitem></varlistentry>
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<varlistentry id="etc-udev">
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<term><filename class="directory">/etc/udev</filename></term>
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<listitem>
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<para>Contains <command>udev</command> configuation files,
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device permissions, and rules for device naming</para>
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<indexterm zone="ch-system-udev etc-udev"><primary sortas="e-/etc/udev">/etc/udev</primary></indexterm>
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</listitem></varlistentry>
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</variablelist>
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</sect2>
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</sect1>
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