[9dfc02f] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[b06ca36] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[9dfc02f] | 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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[ddd5542] | 7 |
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[a001133] | 8 | <sect1 id="ch-system-udev" role="wrap">
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[ddd5542] | 9 | <?dbhtml filename="udev.html"?>
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| 10 |
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[e747759] | 11 | <sect1info condition="script">
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| 12 | <productname>udev</productname>
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| 13 | <productnumber>&udev-version;</productnumber>
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| 14 | <address>&udev-url;</address>
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| 15 | </sect1info>
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| 16 |
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[ddd5542] | 17 | <title>Udev-&udev-version;</title>
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| 18 |
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| 19 | <indexterm zone="ch-system-udev">
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| 20 | <primary sortas="a-Udev">Udev</primary>
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| 21 | </indexterm>
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| 22 |
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| 23 | <sect2 role="package">
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| 24 | <title/>
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[9dfc02f] | 25 |
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[ddd5542] | 26 | <para>The Udev package contains programs for dynamic creation of device
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| 27 | nodes.</para>
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[9dfc02f] | 28 |
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[ddd5542] | 29 | <segmentedlist>
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| 30 | <segtitle>&buildtime;</segtitle>
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| 31 | <segtitle>&diskspace;</segtitle>
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[9dfc02f] | 32 |
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[ddd5542] | 33 | <seglistitem>
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[e4a5635] | 34 | <seg>&udev-ch6-sbu;</seg>
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| 35 | <seg>&udev-ch6-du;</seg>
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[ddd5542] | 36 | </seglistitem>
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| 37 | </segmentedlist>
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[9dfc02f] | 38 |
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[ddd5542] | 39 | </sect2>
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[9dfc02f] | 40 |
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[ddd5542] | 41 | <sect2 role="installation">
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| 42 | <title>Installation of Udev</title>
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| 43 |
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[7d6d34b] | 44 | <para>The udev-config tarball contains LFS-specific files used to configure
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[e1060de] | 45 | Udev. Unpack it into the Udev source directory:</para>
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[7d6d34b] | 46 |
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[0445a3d] | 47 | <screen><userinput remap="pre">tar -xvf ../&udev-config;.tar.bz2</userinput></screen>
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[7d6d34b] | 48 |
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[d2c332bc] | 49 | <para>Create some devices and directories that Udev cannot handle due to
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| 50 | them being required very early in the boot process:</para>
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| 51 |
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[2b596c0b] | 52 | <screen><userinput remap="install">install -dv /lib/{firmware,udev/devices/{pts,shm}}
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[d2c332bc] | 53 | mknod -m0666 /lib/udev/devices/null c 1 3
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| 54 | ln -sv /proc/self/fd /lib/udev/devices/fd
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| 55 | ln -sv /proc/self/fd/0 /lib/udev/devices/stdin
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| 56 | ln -sv /proc/self/fd/1 /lib/udev/devices/stdout
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| 57 | ln -sv /proc/self/fd/2 /lib/udev/devices/stderr
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| 58 | ln -sv /proc/kcore /lib/udev/devices/core</userinput></screen>
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| 59 |
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[408d21f] | 60 | <para><command>usb_id</command> is known to segfault under certain kernel
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| 61 | configurations. Fix the issue by applying the following patch:</para>
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| 62 |
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| 63 | <screen><userinput remap="pre">patch -Np1 -i ../&udev-usbid-patch;</userinput></screen>
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| 64 |
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[ddd5542] | 65 | <para>Compile the package:</para>
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[9dfc02f] | 66 |
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[0445a3d] | 67 | <screen><userinput remap="make">make EXTRAS="`echo extras/*/`"</userinput></screen>
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[81fd230] | 68 |
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[ddd5542] | 69 | <variablelist>
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| 70 | <title>The meaning of the make option:</title>
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| 71 |
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| 72 | <varlistentry>
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[d2c332bc] | 73 | <term><parameter>EXTRAS=...</parameter></term>
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[ddd5542] | 74 | <listitem>
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[8536c02] | 75 | <para>This builds the helper binaries that can aid in writing custom
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[d2c332bc] | 76 | Udev rules.</para>
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[ddd5542] | 77 | </listitem>
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| 78 | </varlistentry>
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[09043c0] | 79 |
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[ddd5542] | 80 | </variablelist>
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[09043c0] | 81 |
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[0445a3d] | 82 | <para>To test the results, issue:</para>
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| 83 |
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| 84 | <screen><userinput remap="test">make test</userinput></screen>
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[81fd230] | 85 |
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[c226182] | 86 | <para>Note that the Udev testsuite will produce numerous messages in
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| 87 | the host system's logs. These are harmless and can be ignored.</para>
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| 88 |
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[ddd5542] | 89 | <para>Install the package:</para>
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[9dfc02f] | 90 |
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[0445a3d] | 91 | <screen><userinput remap="install">make DESTDIR=/ EXTRAS="`echo extras/*/`" install</userinput></screen>
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[09043c0] | 92 |
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[ddd5542] | 93 | <variablelist>
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| 94 | <title>The meaning of the make parameter:</title>
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[09043c0] | 95 |
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[ddd5542] | 96 | <varlistentry>
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| 97 | <term><parameter>DESTDIR=/</parameter></term>
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| 98 | <listitem>
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| 99 | <para>This prevents the Udev build process from killing any
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| 100 | <command>udevd</command> processes that may be running on the
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| 101 | host system.</para>
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| 102 | </listitem>
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| 103 | </varlistentry>
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[9dfc02f] | 104 |
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[ddd5542] | 105 | </variablelist>
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| 106 |
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[23732c83] | 107 | <para>Udev has to be configured in order to work properly, as it only
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| 108 | installs a few configuration files by default. First install the
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[dbfd971] | 109 | commonly-used rules files provided by Udev:</para>
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[18da154] | 110 |
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[0445a3d] | 111 | <screen><userinput remap="install">cp -v etc/udev/rules.d/[0-9]* /etc/udev/rules.d/</userinput></screen>
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[18da154] | 112 |
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[dbfd971] | 113 | <para>Now install the LFS-specific rules files:</para>
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[7eac3e32] | 114 |
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[0445a3d] | 115 | <screen><userinput remap="install">cd &udev-config;
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[7e6fb44] | 116 | make install</userinput></screen>
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| 117 |
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| 118 | <para>Install the documentation that explains the LFS-specific rules
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| 119 | files:</para>
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| 120 |
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[0445a3d] | 121 | <screen><userinput remap="install">make install-doc</userinput></screen>
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[7e6fb44] | 122 |
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[dbfd971] | 123 | <para>Install the documentation that explains the commonly-used rules
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| 124 | files provided by Udev:</para>
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[7e6fb44] | 125 |
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[0445a3d] | 126 | <screen><userinput remap="install">make install-extra-doc</userinput></screen>
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[7e6fb44] | 127 |
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| 128 | <para>Install the documentation that explains how to create custom Udev
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| 129 | rules:</para>
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| 130 |
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[0445a3d] | 131 | <screen><userinput remap="install">cd ..
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[997a8b7] | 132 | install -m644 -v docs/writing_udev_rules/index.html \
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[2c558d69] | 133 | /usr/share/doc/udev-&udev-version;/index.html</userinput></screen>
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[7eac3e32] | 134 |
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[ddd5542] | 135 | </sect2>
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| 136 |
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| 137 | <sect2 id="contents-udev" role="content">
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| 138 | <title>Contents of Udev</title>
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| 139 |
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| 140 | <segmentedlist>
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| 141 | <segtitle>Installed programs</segtitle>
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[2791a8e] | 142 | <segtitle>Installed libraries</segtitle>
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[ddd5542] | 143 | <segtitle>Installed directory</segtitle>
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| 144 |
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| 145 | <seglistitem>
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[2791a8e] | 146 | <seg>ata_id, cdrom_id, create_floppy_devices, edd_id, firmware.sh,
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[7d6d34b] | 147 | path_id, scsi_id, udevcontrol, udevd, udevinfo, udevmonitor, udevsettle,
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[2791a8e] | 148 | udevtest, udevtrigger, usb_id, vol_id, write_cd_rules, and
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| 149 | write_net_rules</seg>
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| 150 | <seg>libvolume_id</seg>
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[ddd5542] | 151 | <seg>/etc/udev</seg>
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| 152 | </seglistitem>
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| 153 | </segmentedlist>
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| 154 |
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| 155 | <variablelist>
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| 156 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 157 | <?dbfo list-presentation="list"?>
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| 158 | <?dbhtml list-presentation="table"?>
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| 159 |
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[d2c332bc] | 160 | <varlistentry id="ata_id">
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| 161 | <term><command>ata_id</command></term>
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| 162 | <listitem>
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| 163 | <para>Provides Udev with a unique string and
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| 164 | additional information (uuid, label) for an ATA drive</para>
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| 165 | <indexterm zone="ch-system-udev ata_id">
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| 166 | <primary sortas="b-ata_id">ata_id</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="cdrom_id">
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| 172 | <term><command>cdrom_id</command></term>
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| 173 | <listitem>
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| 174 | <para>Provides Udev with the capabilities of a
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| 175 | CD-ROM or DVD-ROM drive</para>
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| 176 | <indexterm zone="ch-system-udev cdrom_id">
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| 177 | <primary sortas="b-cdrom_id">cdrom_id</primary>
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| 178 | </indexterm>
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| 179 | </listitem>
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| 180 | </varlistentry>
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| 181 |
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| 182 | <varlistentry id="create_floppy_devices">
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| 183 | <term><command>create_floppy_devices</command></term>
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[ddd5542] | 184 | <listitem>
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[d2c332bc] | 185 | <para>Creates all possible floppy devices based on the CMOS type</para>
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| 186 | <indexterm zone="ch-system-udev create_floppy_devices">
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| 187 | <primary sortas="b-create_floppy_devices">create_floppy_devices</primary>
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[ddd5542] | 188 | </indexterm>
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| 189 | </listitem>
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| 190 | </varlistentry>
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| 191 |
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[d2c332bc] | 192 | <varlistentry id="edd_id">
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| 193 | <term><command>edd_id</command></term>
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[ddd5542] | 194 | <listitem>
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[d2c332bc] | 195 | <para>Provides Udev with the EDD ID for a BIOS disk drive</para>
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| 196 | <indexterm zone="ch-system-udev edd_id">
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| 197 | <primary sortas="b-edd_id">edd_id</primary>
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[ddd5542] | 198 | </indexterm>
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| 199 | </listitem>
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| 200 | </varlistentry>
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| 201 |
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[2791a8e] | 202 | <varlistentry id="firmware.sh">
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| 203 | <term><command>firmware.sh</command></term>
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[ddd5542] | 204 | <listitem>
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[d2c332bc] | 205 | <para>Uploads firmware to devices</para>
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[2791a8e] | 206 | <indexterm zone="ch-system-udev firmware.sh">
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| 207 | <primary sortas="b-firmware.sh">firmware.sh</primary>
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[d2c332bc] | 208 | </indexterm>
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| 209 | </listitem>
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| 210 | </varlistentry>
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| 211 |
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[7d6d34b] | 212 | <varlistentry id="path_id">
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| 213 | <term><command>path_id</command></term>
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| 214 | <listitem>
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[9058aa1] | 215 | <para>Provides the shortest possible unique hardware path to a
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[7d6d34b] | 216 | device</para>
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| 217 | <indexterm zone="ch-system-udev path_id">
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| 218 | <primary sortas="b-path_id">path_id</primary>
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| 219 | </indexterm>
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| 220 | </listitem>
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| 221 | </varlistentry>
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| 222 |
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[d2c332bc] | 223 | <varlistentry id="scsi_id">
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| 224 | <term><command>scsi_id</command></term>
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| 225 | <listitem>
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| 226 | <para>Provides Udev with a unique SCSI identifier
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| 227 | based on the data returned from sending a SCSI INQUIRY command to
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| 228 | the specified device</para>
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| 229 | <indexterm zone="ch-system-udev scsi_id">
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| 230 | <primary sortas="b-scsi_id">scsi_id</primary>
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[ddd5542] | 231 | </indexterm>
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| 232 | </listitem>
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| 233 | </varlistentry>
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| 234 |
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| 235 | <varlistentry id="udevcontrol">
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| 236 | <term><command>udevcontrol</command></term>
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| 237 | <listitem>
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| 238 | <para>Configures a number of options for the running
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| 239 | <command>udevd</command> daemon, such as the log level.</para>
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| 240 | <indexterm zone="ch-system-udev udevcontrol">
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| 241 | <primary sortas="b-udevcontrol">udevcontrol</primary>
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| 242 | </indexterm>
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| 243 | </listitem>
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| 244 | </varlistentry>
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| 245 |
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| 246 | <varlistentry id="udevd">
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| 247 | <term><command>udevd</command></term>
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| 248 | <listitem>
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[d2c332bc] | 249 | <para>A daemon that listens for uevents on the netlink socket,
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| 250 | creates devices and runs the configured external programs in
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| 251 | response to these uevents</para>
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[ddd5542] | 252 | <indexterm zone="ch-system-udev udevd">
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| 253 | <primary sortas="b-udevd">udevd</primary>
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| 254 | </indexterm>
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| 255 | </listitem>
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| 256 | </varlistentry>
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| 257 |
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| 258 | <varlistentry id="udevinfo">
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| 259 | <term><command>udevinfo</command></term>
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| 260 | <listitem>
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[d2c332bc] | 261 | <para>Allows users to query the Udev database for
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[ddd5542] | 262 | information on any device currently present on the system; it also
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| 263 | provides a way to query any device in the <systemitem
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| 264 | class="filesystem">sysfs</systemitem> tree to help create udev
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| 265 | rules</para>
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| 266 | <indexterm zone="ch-system-udev udevinfo">
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| 267 | <primary sortas="b-udevinfo">udevinfo</primary>
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| 268 | </indexterm>
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| 269 | </listitem>
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| 270 | </varlistentry>
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| 271 |
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| 272 | <varlistentry id="udevmonitor">
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| 273 | <term><command>udevmonitor</command></term>
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| 274 | <listitem>
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[d2c332bc] | 275 | <para>Prints the event received from the kernel and the environment
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| 276 | which Udev sends out after rule processing</para>
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[ddd5542] | 277 | <indexterm zone="ch-system-udev udevmonitor">
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| 278 | <primary sortas="b-udevmonitor">udevmonitor</primary>
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| 279 | </indexterm>
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| 280 | </listitem>
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| 281 | </varlistentry>
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| 282 |
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[7d6d34b] | 283 | <varlistentry id="udevsettle">
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| 284 | <term><command>udevsettle</command></term>
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| 285 | <listitem>
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| 286 | <para>Watches the Udev event queue and exits if all current uevents
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| 287 | have been handled</para>
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| 288 | <indexterm zone="ch-system-udev udevsettle">
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| 289 | <primary sortas="b-udevsettle">udevsettle</primary>
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| 290 | </indexterm>
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| 291 | </listitem>
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| 292 | </varlistentry>
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| 293 |
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[d2c332bc] | 294 | <varlistentry id="udevtest">
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| 295 | <term><command>udevtest</command></term>
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[ddd5542] | 296 | <listitem>
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[d2c332bc] | 297 | <para>Simulates a uevent for the given device, and prints out the
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| 298 | name of the node the real <command>udevd</command> would have created,
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| 299 | or the name of the renamed network interface</para>
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| 300 | <indexterm zone="ch-system-udev udevtest">
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| 301 | <primary sortas="b-udevtest">udevtest</primary>
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[ddd5542] | 302 | </indexterm>
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| 303 | </listitem>
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| 304 | </varlistentry>
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| 305 |
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[7d6d34b] | 306 | <varlistentry id="udevtrigger">
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| 307 | <term><command>udevtrigger</command></term>
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| 308 | <listitem>
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| 309 | <para>Triggers kernel device uevents to be replayed</para>
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| 310 | <indexterm zone="ch-system-udev udevtrigger">
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| 311 | <primary sortas="b-udevtrigger">udevtrigger</primary>
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| 312 | </indexterm>
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| 313 | </listitem>
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| 314 | </varlistentry>
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| 315 |
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[d2c332bc] | 316 | <varlistentry id="usb_id">
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| 317 | <term><command>usb_id</command></term>
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[ddd5542] | 318 | <listitem>
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[d2c332bc] | 319 | <para>Provides Udev with information about USB
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| 320 | devices</para>
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| 321 | <indexterm zone="ch-system-udev usb_id">
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| 322 | <primary sortas="b-usb_id">usb_id</primary>
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[ddd5542] | 323 | </indexterm>
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| 324 | </listitem>
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| 325 | </varlistentry>
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| 326 |
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[d2c332bc] | 327 | <varlistentry id="vol_id">
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| 328 | <term><command>vol_id</command></term>
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[ddd5542] | 329 | <listitem>
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[d2c332bc] | 330 | <para>Provides Udev with the label and uuid of a
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| 331 | filesystem</para>
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| 332 | <indexterm zone="ch-system-udev vol_id">
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| 333 | <primary sortas="b-vol_id">vol_id</primary>
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[ddd5542] | 334 | </indexterm>
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| 335 | </listitem>
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| 336 | </varlistentry>
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| 337 |
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[2791a8e] | 338 | <varlistentry id="write_cd_rules">
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| 339 | <term><command>write_cd_rules</command></term>
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| 340 | <listitem>
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| 341 | <para>A script which generates Udev rules to provide stable names for
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| 342 | optical drives (see also <xref linkend="ch-scripts-symlinks"/>)</para>
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| 343 | <indexterm zone="ch-system-udev write_cd_rules">
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| 344 | <primary sortas="b-write_cd_rules">write_cd_rules</primary>
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| 345 | </indexterm>
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| 346 | </listitem>
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| 347 | </varlistentry>
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| 348 |
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| 349 | <varlistentry id="write_net_rules">
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| 350 | <term><command>write_net_rules</command></term>
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| 351 | <listitem>
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| 352 | <para>A script which generates rules to provide stable names for
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| 353 | network interfaces (see also <xref linkend="ch-scripts-network"/>)
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| 354 | </para>
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| 355 | <indexterm zone="ch-system-udev write_net_rules">
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| 356 | <primary sortas="b-write_net_rules">write_net_rules</primary>
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| 357 | </indexterm>
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| 358 | </listitem>
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| 359 | </varlistentry>
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| 360 |
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| 361 | <varlistentry id="libvolume_id">
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| 362 | <term><command>libvolume_id</command></term>
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| 363 | <listitem>
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| 364 | <para></para>
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| 365 | <indexterm zone="ch-system-udev libvolume_id">
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| 366 | <primary sortas="c-libvolume_id">libvolume_id</primary>
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| 367 | </indexterm>
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| 368 | </listitem>
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| 369 | </varlistentry>
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| 370 |
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[ddd5542] | 371 | <varlistentry id="etc-udev">
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| 372 | <term><filename class="directory">/etc/udev</filename></term>
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| 373 | <listitem>
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[9058aa1] | 374 | <para>Contains Udev configuration files,
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[ddd5542] | 375 | device permissions, and rules for device naming</para>
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| 376 | <indexterm zone="ch-system-udev etc-udev">
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| 377 | <primary sortas="e-/etc/udev">/etc/udev</primary>
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| 378 | </indexterm>
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| 379 | </listitem>
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| 380 | </varlistentry>
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| 381 |
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| 382 | </variablelist>
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| 383 |
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| 384 | </sect2>
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[9dfc02f] | 385 |
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| 386 | </sect1>
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