chapter06/sysvinit.xml

   1 <?xml version="1.0" encoding="ISO-8859-1"?>
   2 <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
   4   <!ENTITY % general-entities SYSTEM "../general.ent">
   5   %general-entities;
   6 ]>
   7
   8 <sect1 id="ch-system-sysvinit" role="wrap" revision="sysv">
   9   <?dbhtml filename="sysvinit.html"?>
  10
  11   <sect1info condition="script">
  12     <productname>sysvinit</productname>
  13     <productnumber>&sysvinit-version;</productnumber>
  14     <address>&sysvinit-url;</address>
  15   </sect1info>
  16
  17   <title>Sysvinit-&sysvinit-version;</title>
  18
  19   <indexterm zone="ch-system-sysvinit">
  20     <primary sortas="a-Sysvinit">Sysvinit</primary>
  21   </indexterm>
  22
  23   <sect2 role="package">
  24     <title/>
  25
  26     <para>The Sysvinit package contains programs for controlling the startup,
  27     running, and shutdown of the system.</para>
  28
  29     <segmentedlist>
  30       <segtitle>&buildtime;</segtitle>
  31       <segtitle>&diskspace;</segtitle>
  32
  33       <seglistitem>
  34         <seg>&sysvinit-ch6-sbu;</seg>
  35         <seg>&sysvinit-ch6-du;</seg>
  36       </seglistitem>
  37     </segmentedlist>
  38
  39   </sect2>
  40
  41   <sect2 role="installation">
  42     <title>Installation of Sysvinit</title>
  43
  44 <!--
  45     <para>When run-levels are changed (for example, when halting the
  46     system), <command>init</command> sends termination signals to those
  47     processes that <command>init</command> itself started and that should
  48     not be running in the new run-level.  While doing this,
  49     <command>init</command> outputs messages like <quote>Sending processes
  50     the TERM signal</quote> which seem to imply that it is sending these
  51     signals to all currently running processes. To avoid this
  52     misinterpretation, modify the source so that these messages read like
  53     <quote>Sending processes configured via /etc/inittab the TERM signal</quote>
  54     instead:</para>
  55
  56 <screen><userinput remap="pre">sed -i 's@Sending processes@&amp; configured via /etc/inittab@g' src/init.c</userinput></screen>
  57
  58     <para>Maintained versions of the <command>wall</command>,
  59     <command>mountpoint</command>, <command>last</command>,
  60     <command>mesg</command>, <command>sulogin</command>, and
  61     <command>utmpdump</command> programs were installed earlier by Util-linux.
  62     Suppress the installation of Sysvinit's versions of these programs and
  63     their man pages:</para>
  64
  65 <screen><userinput remap="make">sed -ri -e '/utmpdump/d'   \
  66         -e '/mountpoint/d' \
  67         -e '/mesg/d'       \
  68         -e 's/= sulogin(\.8)?/=/' src/Makefile</userinput></screen>
  69 -->
  70     <para>First, apply a patch that removes several programs installed by other
  71     packages, clarifies a message, and fixes a compiler warning:</para>
  72
  73 <screen><userinput remap="pre">patch -Np1 -i ../&sysvinit-consolidated-patch;</userinput></screen>
  74
  75     <para>Compile the package:</para>
  76
  77 <screen><userinput remap="make">make</userinput></screen>
  78
  79     <para>This package does not come with a test suite.</para>
  80
  81     <para>Install the package:</para>
  82
  83 <screen><userinput remap="install">make install</userinput></screen>
  84
  85   </sect2>
  86
  87   <sect2 id="contents-sysvinit" role="content">
  88     <title>Contents of Sysvinit</title>
  89
  90     <segmentedlist>
  91       <segtitle>Installed programs</segtitle>
  92
  93       <seglistitem>
  94         <seg>bootlogd, fstab-decode, halt, init, killall5,
  95         poweroff (link to halt), reboot (link to halt), runlevel,
  96         shutdown, and telinit (link to init)</seg>
  97       </seglistitem>
  98     </segmentedlist>
  99
 100     <variablelist>
 101       <bridgehead renderas="sect3">Short Descriptions</bridgehead>
 102       <?dbfo list-presentation="list"?>
 103       <?dbhtml list-presentation="table"?>
 104
 105       <varlistentry id="bootlogd">
 106         <term><command>bootlogd</command></term>
 107         <listitem>
 108           <para>Logs boot messages to a log file</para>
 109           <indexterm zone="ch-system-sysvinit bootlogd">
 110             <primary sortas="b-bootlogd">bootlogd</primary>
 111           </indexterm>
 112         </listitem>
 113       </varlistentry>
 114
 115       <varlistentry id="fstab-decode">
 116         <term><command>fstab-decode</command></term>
 117         <listitem>
 118           <para>Run a command with fstab-encoded arguments</para>
 119           <indexterm zone="ch-system-sysvinit fstab-decode">
 120             <primary sortas="b-fstab-decode">fstab-decode</primary>
 121           </indexterm>
 122         </listitem>
 123       </varlistentry>
 124
 125       <varlistentry id="halt-sysv">
 126         <term><command>halt</command></term>
 127         <listitem>
 128           <para>Normally invokes <command>shutdown</command> with the
 129           <parameter>-h</parameter> option, except when already in run-level 0,
 130           then it tells the kernel to halt the system; it notes in the
 131           file <filename>/var/log/wtmp</filename> that the system is being
 132           brought down</para>
 133           <indexterm zone="ch-system-sysvinit halt-sysv">
 134             <primary sortas="b-halt">halt</primary>
 135           </indexterm>
 136         </listitem>
 137       </varlistentry>
 138
 139       <varlistentry id="init-sysv">
 140         <term><command>init</command></term>
 141         <listitem>
 142           <para>The first process to be started when the kernel has initialized
 143           the hardware which takes over the boot process and starts all the
 144           proceses specified in its configuration file</para>
 145           <indexterm zone="ch-system-sysvinit init-sysv">
 146             <primary sortas="b-init">init</primary>
 147           </indexterm>
 148         </listitem>
 149       </varlistentry>
 150
 151       <varlistentry id="killall5">
 152         <term><command>killall5</command></term>
 153         <listitem>
 154           <para>Sends a signal to all processes, except the processes in its own
 155           session so it will not kill its parent shell</para>
 156           <indexterm zone="ch-system-sysvinit killall5">
 157             <primary sortas="b-killall5">killall5</primary>
 158           </indexterm>
 159         </listitem>
 160       </varlistentry>
 161
 162       <varlistentry id="poweroff-sysv">
 163         <term><command>poweroff</command></term>
 164         <listitem>
 165           <para>Tells the kernel to halt the system and switch off the computer
 166           (see <command>halt</command>)</para>
 167           <indexterm zone="ch-system-sysvinit poweroff-sysv">
 168             <primary sortas="b-poweroff">poweroff</primary>
 169           </indexterm>
 170         </listitem>
 171       </varlistentry>
 172
 173       <varlistentry id="reboot-sysv">
 174         <term><command>reboot</command></term>
 175         <listitem>
 176           <para>Tells the kernel to reboot the system (see
 177           <command>halt</command>)</para>
 178           <indexterm zone="ch-system-sysvinit reboot-sysv">
 179             <primary sortas="b-reboot">reboot</primary>
 180           </indexterm>
 181         </listitem>
 182       </varlistentry>
 183
 184       <varlistentry id="runlevel-sysv">
 185         <term><command>runlevel</command></term>
 186         <listitem>
 187           <para>Reports the previous and the current run-level, as noted in the
 188           last run-level record in <filename>/var/run/utmp</filename></para>
 189           <indexterm zone="ch-system-sysvinit runlevel-sysv">
 190             <primary sortas="b-runlevel">runlevel</primary>
 191           </indexterm>
 192         </listitem>
 193       </varlistentry>
 194
 195       <varlistentry id="shutdown-sysv">
 196         <term><command>shutdown</command></term>
 197         <listitem>
 198           <para>Brings the system down in a secure way, signaling all processes
 199           and notifying all logged-in users</para>
 200           <indexterm zone="ch-system-sysvinit shutdown-sysv">
 201             <primary sortas="b-shutdown">shutdown</primary>
 202           </indexterm>
 203         </listitem>
 204       </varlistentry>
 205
 206       <varlistentry id="telinit-sysv">
 207         <term><command>telinit</command></term>
 208         <listitem>
 209           <para>Tells <command>init</command> which run-level to change to</para>
 210           <indexterm zone="ch-system-sysvinit telinit-sysv">
 211             <primary sortas="b-telinit">telinit</primary>
 212           </indexterm>
 213         </listitem>
 214       </varlistentry>
 215
 216     </variablelist>
 217
 218   </sect2>
 219
 220 </sect1>