[9dfc02f] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[1fe35e1] | 2 | <!DOCTYPE section [
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[9dfc02f] | 3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 4 | %general-entities;
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| 5 | ]>
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[1fe35e1] | 6 | <section xmlns="http://docbook.org/docbook-ng"
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| 7 | xml:id="ch-system-udev" role="wrap">
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| 8 | <info><title>Udev-&udev-version;</title></info>
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[9dfc02f] | 9 | <?dbhtml filename="udev.html"?>
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| 10 |
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[a001133] | 11 | <indexterm zone="ch-system-udev"><primary sortas="a-Udev">Udev</primary></indexterm>
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[9dfc02f] | 12 |
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[1fe35e1] | 13 | <section role="package"><info><title/></info>
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[32324418] | 14 | <para>The Udev package contains programs for dynamic creation of device nodes.</para>
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[9dfc02f] | 15 |
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[a001133] | 16 | <segmentedlist>
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| 17 | <segtitle>&buildtime;</segtitle>
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| 18 | <segtitle>&diskspace;</segtitle>
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| 19 | <seglistitem><seg>0.2 SBU</seg><seg>5.2 MB</seg></seglistitem>
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| 20 | </segmentedlist>
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[9dfc02f] | 21 |
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[1fe35e1] | 22 | </section>
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[a001133] | 23 |
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[1fe35e1] | 24 | <section role="installation">
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| 25 | <info><title>Installation of Udev</title></info>
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[9dfc02f] | 26 |
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[bd7538b] | 27 | <para>Compile Udev:</para>
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[9dfc02f] | 28 |
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| 29 | <screen><userinput>make udevdir=/dev</userinput></screen>
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| 30 |
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[a766a93] | 31 | <variablelist>
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| 32 | <varlistentry>
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| 33 | <term><parameter>udevdir=/dev</parameter></term>
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| 34 | <listitem><para>This tells <command>udev</command> which directory it is to
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| 35 | create device nodes in.</para></listitem>
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| 36 | </varlistentry>
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| 37 | </variablelist>
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| 38 |
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[18da154] | 39 | <para>Install it:</para>
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[9dfc02f] | 40 |
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[4b31e82] | 41 | <screen><userinput>make udevdir=/dev install</userinput></screen>
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[9dfc02f] | 42 |
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[18da154] | 43 | <para>Udev's configuration is far from ideal by default, so we install our own
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| 44 | configuration files here:</para>
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| 45 |
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[4148d1a] | 46 | <screen><userinput>cp ../udev-config-2.permissions /etc/udev/permissions.d/25-lfs.permissions
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| 47 | cp ../udev-config-1.rules /etc/udev/rules.d/25-lfs.rules</userinput></screen>
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[18da154] | 48 |
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[6135b95] | 49 | <para>Finally, we'll allow udev to create the full compliment of device
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| 50 | nodes, since earlier we only created a minimal set.</para>
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| 51 |
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| 52 | <screen><userinput>/sbin/udevstart</userinput></screen>
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| 53 |
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[1fe35e1] | 54 | </section>
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[9dfc02f] | 55 |
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| 56 |
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[1fe35e1] | 57 | <section xml:id="contents-udev" role="content"><info><title>Contents of Udev</title></info>
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[9dfc02f] | 58 |
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[32324418] | 59 | <segmentedlist>
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| 60 | <segtitle>Installed programs</segtitle>
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| 61 | <seglistitem><seg>udev, udevd, udevsend, udevstart, udevinfo, udevtest</seg></seglistitem>
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| 62 | </segmentedlist>
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| 63 |
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| 64 | <variablelist><title>Short descriptions</title>
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| 65 |
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[1fe35e1] | 66 | <varlistentry xml:id="udev">
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[32324418] | 67 | <term><command>udev</command></term>
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| 68 | <listitem><indexterm zone="ch-system-udev udev"><primary
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| 69 | sortas="b-udev">udev</primary></indexterm>
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| 70 | <para>is used to create device nodes in <filename
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| 71 | class="directory">/dev</filename> or to rename network interfaces (not in LFS)
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| 72 | in response to hotplug events.</para>
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| 73 | </listitem></varlistentry>
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| 74 |
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[1fe35e1] | 75 | <varlistentry xml:id="udevd">
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[32324418] | 76 | <term><command>udevd</command></term>
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| 77 | <listitem> <indexterm zone="ch-system-udev udevd"><primary
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| 78 | sortas="b-udevd">udevd</primary></indexterm>
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| 79 | <para>is a daemon that reorders hotplug events before submitting them to
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| 80 | <command>udev</command>,
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| 81 | thus avoiding various race conditions.</para>
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| 82 | </listitem></varlistentry>
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| 83 |
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[1fe35e1] | 84 | <varlistentry xml:id="udevsend">
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[32324418] | 85 | <term><command>udevsend</command></term>
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| 86 | <listitem> <indexterm zone="ch-system-udev udevsend"><primary
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| 87 | sortas="b-udevsend">udevsend</primary></indexterm>
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| 88 | <para>is used to deliver hotplug events to <command>udevd</command>.</para>
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| 89 | </listitem></varlistentry>
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| 90 |
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[1fe35e1] | 91 | <varlistentry xml:id="udevstart">
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[32324418] | 92 | <term><command>udevstart</command></term>
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| 93 | <listitem> <indexterm zone="ch-system-udev udevstart"><primary
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| 94 | sortas="b-udevstart">udevstart</primary></indexterm>
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| 95 | <para>is used to create device nodes in <filename
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| 96 | class="directory">/dev</filename> that correspond to drivers compiled directly
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| 97 | into the kernel. It performs that task by simulating hotplug events presumably
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| 98 | dropped by the kernel before invocation of this program (e.g. because the root
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| 99 | filesystem has not been mounted) and submitting such synthetic hotplug events
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| 100 | to <command>udev</command>.</para>
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| 101 | </listitem>
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| 102 | </varlistentry>
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| 103 |
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[1fe35e1] | 104 | <varlistentry xml:id="udevinfo">
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[32324418] | 105 | <term><command>udevinfo</command></term>
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| 106 | <listitem> <indexterm zone="ch-system-udev udevinfo"><primary
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| 107 | sortas="b-udevinfo">udevinfo</primary></indexterm>
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| 108 | <para>allows users to query the <command>udev</command> database for
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| 109 | information on any device currently present on the system. It also
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| 110 | provides a way to query any device in the sysfs tree to help creating udev
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| 111 | rules.</para>
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| 112 | </listitem></varlistentry>
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| 113 |
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[1fe35e1] | 114 | <varlistentry xml:id="udevtest">
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[32324418] | 115 | <term><command>udevtest</command></term>
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| 116 | <listitem> <indexterm zone="ch-system-udev udevtest"><primary
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| 117 | sortas="b-udevtest">udevtest</primary></indexterm>
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| 118 | <para>simulates a <command>udev</command> run for the given device,
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| 119 | and prints out the name of the node the real <command>udev</command> would
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| 120 | have created, or (not in LFS) the name of the renamed network interface.</para>
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| 121 | </listitem></varlistentry>
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| 122 |
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[1fe35e1] | 123 | <varlistentry xml:id="etc-dev-d">
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[32324418] | 124 | <term><filename class="directory">/etc/dev.d</filename></term>
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| 125 | <listitem> <indexterm zone="ch-system-udev etc-dev-d"><primary
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[811be305] | 126 | sortas="e-etc-dev-d">/etc/dev.d</primary></indexterm>
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[32324418] | 127 | <para>directory is supposed to contain user-written handlers for device
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| 128 | creation hotplug events.</para>
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| 129 | </listitem></varlistentry>
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| 130 |
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[1fe35e1] | 131 | <varlistentry xml:id="etc-udev">
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[32324418] | 132 | <term><filename class="directory">/etc/udev</filename></term>
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| 133 | <listitem> <indexterm zone="ch-system-udev etc-udev"><primary
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[811be305] | 134 | sortas="e-etc-udev">/etc/udev</primary></indexterm>
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[e5f5241] | 135 | <para>directory contains <command>udev</command> configuration files,
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[32324418] | 136 | device permissions and rules for device naming.</para>
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| 137 | </listitem></varlistentry>
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| 138 | </variablelist>
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[1fe35e1] | 139 | </section>
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[9dfc02f] | 140 |
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[1fe35e1] | 141 | </section>
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