1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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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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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-eudev" role="wrap" revision="sysv">
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9 | <?dbhtml filename="eudev.html"?>
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10 |
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11 | <sect1info condition="script">
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12 | <productname>eudev</productname>
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13 | <productnumber>&eudev-version;</productnumber>
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14 | <address>&eudev-url;</address>
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15 | </sect1info>
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16 |
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17 | <title>Eudev-&eudev-version;</title>
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18 |
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19 | <indexterm zone="ch-system-eudev">
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20 | <primary sortas="a-Eudev">Eudev</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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25 |
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26 | <para>The Eudev package contains programs for dynamic creation of device
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27 | nodes.</para>
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28 |
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29 | <segmentedlist>
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30 | <segtitle>&buildtime;</segtitle>
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31 | <segtitle>&diskspace;</segtitle>
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32 |
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33 | <seglistitem>
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34 | <seg>&eudev-fin-sbu;</seg>
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35 | <seg>&eudev-fin-du;</seg>
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36 | </seglistitem>
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37 | </segmentedlist>
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38 | </sect2>
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39 |
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40 | <sect2 role="installation">
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41 | <title>Installation of Eudev</title>
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42 | <!-- No longer seems needed. bdubbs 5/18/23
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43 | <para>First fix the location of udev rules in the .pc file:</para>
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44 |
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45 | <screen><userinput remap="pre">sed -i '/udevdir/a udev_dir=${udevdir}' src/udev/udev.pc.in</userinput></screen>
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46 | -->
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47 | <!-- different from systemd: we do not have a render group and file is
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48 | named differently -->
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49 | <para>Remove an unneeded group
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50 | <systemitem class="groupname">sgx</systemitem>, from the default udev
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51 | rules:</para>
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52 |
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53 | <screen><userinput remap="pre">sed -i -e 's/GROUP="sgx", //' rules/50-udev-default.rules</userinput></screen>
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54 |
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55 | <para>Prepare Eudev for compilation:</para>
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56 |
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57 | <screen><userinput remap="configure">./configure --prefix=/usr \
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58 | --bindir=/usr/sbin \
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59 | --sysconfdir=/etc \
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60 | --enable-manpages \
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61 | --disable-static</userinput></screen>
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62 |
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63 | <para>Compile the package:</para>
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64 |
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65 | <screen><userinput remap="make">make</userinput></screen>
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66 |
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67 | <para>Create some directories now that are needed for tests, but
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68 | will also be used as a part of installation:</para>
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69 |
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70 | <screen><userinput remap="test">mkdir -pv /usr/lib/udev/rules.d
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71 | mkdir -pv /etc/udev/rules.d</userinput></screen>
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72 |
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73 | <para>To test the results, issue:</para>
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74 |
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75 | <screen><userinput remap="test">make check</userinput></screen>
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76 |
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77 | <para>Install the package:</para>
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78 |
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79 | <screen><userinput remap="install">make install</userinput></screen>
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80 |
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81 | <para>Install some custom rules and support files useful in an LFS
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82 | environment:</para>
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83 |
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84 | <screen><userinput remap="install">tar -xvf ../&udev-lfs-version;.tar.xz
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85 | make -f &udev-lfs-version;/Makefile.lfs install</userinput></screen>
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86 |
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87 | </sect2>
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88 |
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89 | <sect2 id="conf-eudev" role="configuration">
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90 | <title>Configuring Eudev</title>
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91 |
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92 | <indexterm zone="conf-eudev">
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93 | <primary sortas="a-Eudev">Eudev</primary>
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94 | <secondary>configuring</secondary>
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95 | </indexterm>
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96 |
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97 | <indexterm zone="conf-eudev">
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98 | <primary sortas="e-/etc/udev/rules.d/65-kvm.rules">/etc/udev/rules.d/65-kvm.rules</primary>
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99 | </indexterm>
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100 |
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101 | <para>
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102 | The default udev rule installed by Eudev would allow all users to
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103 | access <filename class='devicefile'>/dev/kvm</filename>. The editors
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104 | consider it dangerous. Create a configuration file to override it:
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105 | </para>
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106 |
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107 | <screen><userinput>cat > /etc/udev/rules.d/65-kvm.rules << "EOF"
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108 | <literal>KERNEL=="kvm", GROUP="kvm", MODE="0660", TAG+="uaccess"</literal>
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109 | EOF</userinput></screen>
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110 |
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111 | <indexterm zone="conf-eudev">
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112 | <primary sortas="e-/etc/udev/hwdb.bin">/etc/udev/hwdb.bin</primary>
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113 | </indexterm>
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114 |
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115 | <para>Information about hardware devices is maintained in the
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116 | <filename class="directory">/etc/udev/hwdb.d</filename> and
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117 | <filename class="directory">/usr/lib/udev/hwdb.d</filename> directories.
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118 | <application>Eudev</application> needs that information to be compiled
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119 | into a binary database <filename>/etc/udev/hwdb.bin</filename>. Create the
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120 | initial database:</para>
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121 |
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122 | <screen><userinput>udevadm hwdb --update</userinput></screen>
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123 |
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124 | <para>This command needs to be run each time the hardware information is
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125 | updated.</para>
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126 |
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127 | </sect2>
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128 |
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129 | <sect2 id="contents-eudev" role="content">
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130 | <title>Contents of Eudev</title>
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131 |
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132 | <segmentedlist>
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133 | <segtitle>Installed programs</segtitle>
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134 | <segtitle>Installed libraries</segtitle>
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135 | <segtitle>Installed directories</segtitle>
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136 |
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137 | <seglistitem>
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138 | <seg><!-- These are in /usr/lib/udev and not to be called by the user:
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139 | accelerometer, ata_id, cdrom_id, collect, mtd_probe,
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140 | scsi_id, v4l_id,--> udevadm and udevd</seg>
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141 |
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142 | <seg>libudev.so</seg>
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143 |
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144 | <seg>/etc/udev, /usr/lib/udev, and /usr/share/doc/udev-&udev-lfs-version;</seg>
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145 | </seglistitem>
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146 | </segmentedlist>
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147 |
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148 | <variablelist>
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149 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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150 | <?dbfo list-presentation="list"?>
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151 | <?dbhtml list-presentation="table"?>
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152 | <varlistentry id="udevadm" revision="sysv">
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153 | <term><command>udevadm</command></term>
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154 | <listitem>
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155 | <para>Generic udev administration tool: controls the udevd daemon,
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156 | provides info from the Udev database, monitors uevents, waits for
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157 | uevents to finish, tests Udev configuration, and triggers uevents
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158 | for a given device</para>
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159 | <indexterm zone="ch-system-eudev udevadm">
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160 | <primary sortas="b-udevadm">udevadm</primary>
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161 | </indexterm>
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162 | </listitem>
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163 | </varlistentry>
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164 |
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165 | <varlistentry id="udevd">
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166 | <term><command>udevd</command></term>
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167 | <listitem>
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168 | <para>A daemon that listens for uevents on the netlink socket,
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169 | creates devices and runs the configured external programs in
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170 | response to these uevents</para>
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171 | <indexterm zone="ch-system-eudev udevd">
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172 | <primary sortas="b-udevd">udevd</primary>
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173 | </indexterm>
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174 | </listitem>
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175 | </varlistentry>
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176 |
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177 | <varlistentry id="libudev">
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178 | <term><filename class="libraryfile">libudev</filename></term>
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179 | <listitem>
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180 | <para>A library interface to udev device information</para>
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181 | <indexterm zone="ch-system-eudev libudev">
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182 | <primary sortas="c-libudev">libudev</primary>
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183 | </indexterm>
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184 | </listitem>
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185 | </varlistentry>
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186 |
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187 | <varlistentry id="etc-udev">
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188 | <term><filename class="directory">/etc/udev</filename></term>
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189 | <listitem>
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190 | <para>Contains Udev configuration files,
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191 | device permissions, and rules for device naming</para>
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192 | <indexterm zone="ch-system-eudev etc-udev">
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193 | <primary sortas="e-/etc/udev">/etc/udev</primary>
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194 | </indexterm>
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195 | </listitem>
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196 | </varlistentry>
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197 |
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198 | </variablelist>
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199 |
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200 | </sect2>
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201 |
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202 | </sect1>
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