[9dfc02f] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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| 3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 4 | %general-entities;
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| 5 | ]>
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[a001133] | 6 | <sect1 id="ch-system-udev" role="wrap">
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[9dfc02f] | 7 | <title>Udev-&udev-version;</title>
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| 8 | <?dbhtml filename="udev.html"?>
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| 9 |
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[a001133] | 10 | <indexterm zone="ch-system-udev"><primary sortas="a-Udev">Udev</primary></indexterm>
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[9dfc02f] | 11 |
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[a001133] | 12 | <sect2 role="package"><title/>
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[32324418] | 13 | <para>The Udev package contains programs for dynamic creation of device nodes.</para>
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[9dfc02f] | 14 |
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[a001133] | 15 | <segmentedlist>
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| 16 | <segtitle>&buildtime;</segtitle>
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| 17 | <segtitle>&diskspace;</segtitle>
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| 18 | <seglistitem><seg>0.2 SBU</seg><seg>5.2 MB</seg></seglistitem>
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| 19 | </segmentedlist>
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[9dfc02f] | 20 |
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[a001133] | 21 | </sect2>
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| 22 |
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| 23 | <sect2 role="installation">
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[9dfc02f] | 24 | <title>Installation of Udev</title>
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| 25 |
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[bd7538b] | 26 | <para>Compile Udev:</para>
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[9dfc02f] | 27 |
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| 28 | <screen><userinput>make udevdir=/dev</userinput></screen>
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| 29 |
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[a766a93] | 30 | <variablelist>
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| 31 | <varlistentry>
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| 32 | <term><parameter>udevdir=/dev</parameter></term>
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| 33 | <listitem><para>This tells <command>udev</command> which directory it is to
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| 34 | create device nodes in.</para></listitem>
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| 35 | </varlistentry>
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| 36 | </variablelist>
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| 37 |
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[18da154] | 38 | <para>Install it:</para>
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[9dfc02f] | 39 |
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[4b31e82] | 40 | <screen><userinput>make udevdir=/dev install</userinput></screen>
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[9dfc02f] | 41 |
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[18da154] | 42 | <para>Udev's configuration is far from ideal by default, so we install our own
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| 43 | configuration files here:</para>
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| 44 |
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[4148d1a] | 45 | <screen><userinput>cp ../udev-config-2.permissions /etc/udev/permissions.d/25-lfs.permissions
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| 46 | cp ../udev-config-1.rules /etc/udev/rules.d/25-lfs.rules</userinput></screen>
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[18da154] | 47 |
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[6135b95] | 48 | <para>Finally, we'll allow udev to create the full compliment of device
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| 49 | nodes, since earlier we only created a minimal set.</para>
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| 50 |
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| 51 | <screen><userinput>/sbin/udevstart</userinput></screen>
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| 52 |
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[9dfc02f] | 53 | </sect2>
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| 54 |
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| 55 |
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[c6cb3aa] | 56 | <sect2 id="contents-udev" role="content"><title>Contents of Udev</title>
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[9dfc02f] | 57 |
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[32324418] | 58 | <segmentedlist>
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| 59 | <segtitle>Installed programs</segtitle>
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| 60 | <seglistitem><seg>udev, udevd, udevsend, udevstart, udevinfo, udevtest</seg></seglistitem>
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| 61 | </segmentedlist>
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| 62 |
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| 63 | <variablelist><title>Short descriptions</title>
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| 64 |
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| 65 | <varlistentry id="udev">
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| 66 | <term><command>udev</command></term>
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| 67 | <listitem><indexterm zone="ch-system-udev udev"><primary
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| 68 | sortas="b-udev">udev</primary></indexterm>
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| 69 | <para>is used to create device nodes in <filename
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| 70 | class="directory">/dev</filename> or to rename network interfaces (not in LFS)
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| 71 | in response to hotplug events.</para>
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| 72 | </listitem></varlistentry>
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| 73 |
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| 74 | <varlistentry id="udevd">
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| 75 | <term><command>udevd</command></term>
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| 76 | <listitem> <indexterm zone="ch-system-udev udevd"><primary
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| 77 | sortas="b-udevd">udevd</primary></indexterm>
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| 78 | <para>is a daemon that reorders hotplug events before submitting them to
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| 79 | <command>udev</command>,
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| 80 | thus avoiding various race conditions.</para>
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| 81 | </listitem></varlistentry>
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| 82 |
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| 83 | <varlistentry id="udevsend">
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| 84 | <term><command>udevsend</command></term>
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| 85 | <listitem> <indexterm zone="ch-system-udev udevsend"><primary
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| 86 | sortas="b-udevsend">udevsend</primary></indexterm>
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| 87 | <para>is used to deliver hotplug events to <command>udevd</command>.</para>
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| 88 | </listitem></varlistentry>
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| 89 |
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| 90 | <varlistentry id="udevstart">
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| 91 | <term><command>udevstart</command></term>
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| 92 | <listitem> <indexterm zone="ch-system-udev udevstart"><primary
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| 93 | sortas="b-udevstart">udevstart</primary></indexterm>
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| 94 | <para>is used to create device nodes in <filename
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| 95 | class="directory">/dev</filename> that correspond to drivers compiled directly
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| 96 | into the kernel. It performs that task by simulating hotplug events presumably
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| 97 | dropped by the kernel before invocation of this program (e.g. because the root
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| 98 | filesystem has not been mounted) and submitting such synthetic hotplug events
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| 99 | to <command>udev</command>.</para>
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| 100 | </listitem>
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| 101 | </varlistentry>
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| 102 |
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| 103 | <varlistentry id="udevinfo">
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| 104 | <term><command>udevinfo</command></term>
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| 105 | <listitem> <indexterm zone="ch-system-udev udevinfo"><primary
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| 106 | sortas="b-udevinfo">udevinfo</primary></indexterm>
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| 107 | <para>allows users to query the <command>udev</command> database for
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| 108 | information on any device currently present on the system. It also
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| 109 | provides a way to query any device in the sysfs tree to help creating udev
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| 110 | rules.</para>
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| 111 | </listitem></varlistentry>
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| 112 |
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| 113 | <varlistentry id="udevtest">
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| 114 | <term><command>udevtest</command></term>
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| 115 | <listitem> <indexterm zone="ch-system-udev udevtest"><primary
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| 116 | sortas="b-udevtest">udevtest</primary></indexterm>
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| 117 | <para>simulates a <command>udev</command> run for the given device,
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| 118 | and prints out the name of the node the real <command>udev</command> would
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| 119 | have created, or (not in LFS) the name of the renamed network interface.</para>
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| 120 | </listitem></varlistentry>
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| 121 |
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| 122 | <varlistentry id="etc-dev-d">
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| 123 | <term><filename class="directory">/etc/dev.d</filename></term>
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| 124 | <listitem> <indexterm zone="ch-system-udev etc-dev-d"><primary
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[811be305] | 125 | sortas="e-etc-dev-d">/etc/dev.d</primary></indexterm>
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[32324418] | 126 | <para>directory is supposed to contain user-written handlers for device
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| 127 | creation hotplug events.</para>
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| 128 | </listitem></varlistentry>
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| 129 |
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| 130 | <varlistentry id="etc-udev">
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| 131 | <term><filename class="directory">/etc/udev</filename></term>
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| 132 | <listitem> <indexterm zone="ch-system-udev etc-udev"><primary
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[811be305] | 133 | sortas="e-etc-udev">/etc/udev</primary></indexterm>
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[e5f5241] | 134 | <para>directory contains <command>udev</command> configuration files,
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[32324418] | 135 | device permissions and rules for device naming.</para>
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| 136 | </listitem></varlistentry>
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| 137 | </variablelist>
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| 138 | </sect2>
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[9dfc02f] | 139 |
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| 140 | </sect1>
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