| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-system-udev" role="wrap">
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| 9 | <?dbhtml filename="udev.html"?>
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| 10 |
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| 11 | <title>Udev-&udev-version;</title>
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| 12 |
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| 13 | <indexterm zone="ch-system-udev">
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| 14 | <primary sortas="a-Udev">Udev</primary>
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| 15 | </indexterm>
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| 16 |
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| 17 | <sect2 role="package">
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| 18 | <title/>
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| 19 |
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| 20 | <para>The Udev package contains programs for dynamic creation of device
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| 21 | nodes.</para>
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| 22 |
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| 23 | <segmentedlist>
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| 24 | <segtitle>&dependencies;</segtitle>
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| 25 |
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| 26 | <seglistitem>
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| 27 | <seg>Coreutils, GCC, Make, Perl, and Tree</seg>
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| 28 | </seglistitem>
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| 29 | </segmentedlist>
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| 30 |
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| 31 | </sect2>
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| 32 |
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| 33 | <sect2 role="installation">
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| 34 | <title>Installation of Udev</title>
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| 35 |
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| 36 | <para os="a">Compile the package:</para>
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| 37 |
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| 38 | <screen os="b"><userinput>make EXTRAS="extras/firmware extras/run_directory"</userinput></screen>
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| 39 |
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| 40 | <variablelist os="c">
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| 41 | <title>The meaning of the make parameter:</title>
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| 42 |
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| 43 | <varlistentry>
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| 44 | <term><parameter>EXTRAS="extras/firmware extras/run_directory"</parameter></term>
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| 45 | <listitem>
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| 46 | <para>This builds the <command>udev_run_devd</command> and
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| 47 | <command>udev_run_hotplugd</command> binaries, which are required for
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| 48 | correct handling of hotpluggable devices.</para>
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| 49 | </listitem>
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| 50 | </varlistentry>
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| 51 |
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| 52 | </variablelist>
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| 53 |
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| 54 | <para os="d">To test the results, issue:
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| 55 | <userinput>make test</userinput>.</para>
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| 56 |
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| 57 | <para os="e">Install the package:</para>
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| 58 |
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| 59 | <screen os="f"><userinput>make DESTDIR=/ EXTRAS="extras/firmware extras/run_directory" install</userinput></screen>
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| 60 |
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| 61 | <variablelist os="g">
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| 62 | <title>The meaning of the make parameter:</title>
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| 63 |
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| 64 | <varlistentry>
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| 65 | <term><parameter>DESTDIR=/</parameter></term>
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| 66 | <listitem>
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| 67 | <para>This prevents the Udev build process from killing any
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| 68 | <command>udevd</command> processes that may be running on the
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| 69 | system.</para>
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| 70 | </listitem>
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| 71 | </varlistentry>
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| 72 |
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| 73 | </variablelist>
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| 74 |
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| 75 | <para os="h">Udev's configuration is far from ideal by default, so install
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| 76 | the configuration files here:</para>
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| 77 |
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| 78 | <screen os="i"><userinput>cp ../&udev-config-file; /etc/udev/rules.d/25-lfs.rules</userinput></screen>
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| 79 |
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| 80 | <para os="j">Install the documentation that explains how to create
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| 81 | Udev rules:</para>
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| 82 |
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| 83 | <screen os="k"><userinput>install -m644 -D docs/writing_udev_rules/index.html /usr/share/doc/udev-&udev-version;/index.html</userinput></screen>
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| 84 |
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| 85 | <para os="l">Run the <command>udevstart</command> program to create our full
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| 86 | complement of device nodes.</para>
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| 87 |
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| 88 | <screen os="m"><userinput>/sbin/udevstart</userinput></screen>
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| 89 |
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| 90 | </sect2>
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| 91 |
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| 92 | <sect2 id="contents-udev" role="content">
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| 93 | <title>Contents of Udev</title>
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| 94 |
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| 95 | <segmentedlist>
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| 96 | <segtitle>Installed programs</segtitle>
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| 97 | <segtitle>Installed directory</segtitle>
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| 98 |
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| 99 | <seglistitem>
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| 100 | <seg>udev, udevcontrol, udevd, udevinfo, udevmonitor, udevsend,
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| 101 | udevstart and udevtest</seg>
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| 102 | <seg>/etc/udev</seg>
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| 103 | </seglistitem>
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| 104 | </segmentedlist>
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| 105 |
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| 106 | <variablelist>
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| 107 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 108 | <?dbfo list-presentation="list"?>
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| 109 | <?dbhtml list-presentation="table"?>
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| 110 |
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| 111 | <varlistentry id="udev">
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| 112 | <term><command>udev</command></term>
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| 113 | <listitem>
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| 114 | <para>Creates device nodes in <filename
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| 115 | class="directory">/dev</filename> or renames network interfaces (not
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| 116 | in LFS) in response to hotplug events</para>
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| 117 | <indexterm zone="ch-system-udev udev">
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| 118 | <primary sortas="b-udev">udev</primary>
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| 119 | </indexterm>
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| 120 | </listitem>
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| 121 | </varlistentry>
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| 122 |
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| 123 | <varlistentry id="udevcontrol">
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| 124 | <term><command>udevcontrol</command></term>
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| 125 | <listitem>
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| 126 | <para>Configures a number of options for the running
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| 127 | <command>udevd</command> daemon, such as the log level.</para>
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| 128 | <indexterm zone="ch-system-udev udevcontrol">
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| 129 | <primary sortas="b-udevcontrol">udevcontrol</primary>
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| 130 | </indexterm>
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| 131 | </listitem>
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| 132 | </varlistentry>
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| 133 |
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| 134 | <varlistentry id="udevd">
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| 135 | <term><command>udevd</command></term>
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| 136 | <listitem>
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| 137 | <para>A daemon that reorders hotplug events before submitting them to
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| 138 | <command>udev</command>,
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| 139 | thus avoiding various race conditions</para>
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| 140 | <indexterm zone="ch-system-udev udevd">
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| 141 | <primary sortas="b-udevd">udevd</primary>
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| 142 | </indexterm>
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| 143 | </listitem>
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| 144 | </varlistentry>
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| 145 |
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| 146 | <varlistentry id="udevinfo">
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| 147 | <term><command>udevinfo</command></term>
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| 148 | <listitem>
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| 149 | <para>Allows users to query the <command>udev</command> database for
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| 150 | information on any device currently present on the system; it also
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| 151 | provides a way to query any device in the <systemitem
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| 152 | class="filesystem">sysfs</systemitem> tree to help create udev
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| 153 | rules</para>
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| 154 | <indexterm zone="ch-system-udev udevinfo">
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| 155 | <primary sortas="b-udevinfo">udevinfo</primary>
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| 156 | </indexterm>
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| 157 | </listitem>
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| 158 | </varlistentry>
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| 159 |
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| 160 | <varlistentry id="udevmonitor">
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| 161 | <term><command>udevmonitor</command></term>
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| 162 | <listitem>
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| 163 | <para>Prints the event received from the kernel and the event which
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| 164 | <command>udev</command> sends out after rule processing</para>
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| 165 | <indexterm zone="ch-system-udev udevmonitor">
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| 166 | <primary sortas="b-udevmonitor">udevmonitor</primary>
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| 167 | </indexterm>
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| 168 | </listitem>
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| 169 | </varlistentry>
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| 170 |
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| 171 | <varlistentry id="udevsend">
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| 172 | <term><command>udevsend</command></term>
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| 173 | <listitem>
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| 174 | <para>Delivers hotplug events to <command>udevd</command></para>
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| 175 | <indexterm zone="ch-system-udev udevsend">
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| 176 | <primary sortas="b-udevsend">udevsend</primary>
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| 177 | </indexterm>
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| 178 | </listitem>
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| 179 | </varlistentry>
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| 180 |
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| 181 | <varlistentry id="udevstart">
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| 182 | <term><command>udevstart</command></term>
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| 183 | <listitem>
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| 184 | <para>Creates device nodes in <filename class="directory">/dev</filename>
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| 185 | that correspond to drivers compiled directly into the kernel; it
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| 186 | performs that task by simulating hotplug events presumably dropped by
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| 187 | the kernel before invocation of this program (e.g., because the root
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| 188 | filesystem has not been mounted) and submitting such synthetic hotplug
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| 189 | events to <command>udev</command></para>
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| 190 | <indexterm zone="ch-system-udev udevstart">
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| 191 | <primary sortas="b-udevstart">udevstart</primary>
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| 192 | </indexterm>
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| 193 | </listitem>
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| 194 | </varlistentry>
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| 195 |
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| 196 | <varlistentry id="udevtest">
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| 197 | <term><command>udevtest</command></term>
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| 198 | <listitem>
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| 199 | <para>Simulates a <command>udev</command> run for the given device,
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| 200 | and prints out the name of the node the real <command>udev</command>
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| 201 | would have created or (not in LFS) the name of the renamed network
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| 202 | interface</para>
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| 203 | <indexterm zone="ch-system-udev udevtest">
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| 204 | <primary sortas="b-udevtest">udevtest</primary>
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| 205 | </indexterm>
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| 206 | </listitem>
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| 207 | </varlistentry>
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| 208 |
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| 209 | <varlistentry id="etc-udev">
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| 210 | <term><filename class="directory">/etc/udev</filename></term>
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| 211 | <listitem>
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| 212 | <para>Contains <command>udev</command> configuation files,
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| 213 | device permissions, and rules for device naming</para>
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| 214 | <indexterm zone="ch-system-udev etc-udev">
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| 215 | <primary sortas="e-/etc/udev">/etc/udev</primary>
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| 216 | </indexterm>
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| 217 | </listitem>
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| 218 | </varlistentry>
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| 219 |
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| 220 | </variablelist>
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| 221 |
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| 222 | </sect2>
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| 223 |
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| 224 | </sect1>
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