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">
   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     <para>When run-levels are changed (for example, when halting the
  45     system), <command>init</command> sends termination signals to those
  46     processes that <command>init</command> itself started and that should
  47     not be running in the new run-level.  While doing this,
  48     <command>init</command> outputs messages like <quote>Sending processes
  49     the TERM signal</quote> which seem to imply that it is sending these
  50     signals to all currently running processes. To avoid this
  51     misinterpretation, modify the source so that these messages read like
  52     <quote>Sending processes configured via /etc/inittab the TERM signal</quote>
  53     instead:</para>
  54
  55 <screen><userinput remap="pre">sed -i 's@Sending processes@&amp; configured via /etc/inittab@g' \
  56     src/init.c</userinput></screen>
  57
  58     <para>Maintained versions of the <command>wall</command> and
  59     <command>mountpoint</command> programs were
  60     installed earlier by Util-linux. Suppress the installation of Sysvinit's
  61     versions of these programs and their man pages:</para>
  62
  63 <screen><userinput remap="make">sed -i -e 's/utmpdump wall/utmpdump/' \
  64        -e '/= mountpoint/d' \
  65        -e 's/mountpoint.1 wall.1//' src/Makefile</userinput></screen>
  66
  67     <para>Compile the package:</para>
  68
  69 <screen><userinput remap="make">make -C src</userinput></screen>
  70
  71     <para>This package does not come with a test suite.</para>
  72
  73     <para>Install the package:</para>
  74
  75 <screen><userinput remap="install">make -C src install</userinput></screen>
  76
  77   </sect2>
  78
  79   <sect2 id="contents-sysvinit" role="content">
  80     <title>Contents of Sysvinit</title>
  81
  82     <segmentedlist>
  83       <segtitle>Installed programs</segtitle>
  84
  85       <seglistitem>
  86         <seg>bootlogd, fstab-decode, halt, init, killall5, last,
  87         lastb (link to last), mesg, mountpoint, pidof (link to killall5),
  88         poweroff (link to halt),
  89         reboot (link to halt), runlevel, shutdown, sulogin,
  90         telinit (link to init), and utmpdump</seg>
  91       </seglistitem>
  92     </segmentedlist>
  93
  94     <variablelist>
  95       <bridgehead renderas="sect3">Short Descriptions</bridgehead>
  96       <?dbfo list-presentation="list"?>
  97       <?dbhtml list-presentation="table"?>
  98
  99       <varlistentry id="bootlogd">
 100         <term><command>bootlogd</command></term>
 101         <listitem>
 102           <para>Logs boot messages to a log file</para>
 103           <indexterm zone="ch-system-sysvinit bootlogd">
 104             <primary sortas="b-bootlogd">bootlogd</primary>
 105           </indexterm>
 106         </listitem>
 107       </varlistentry>
 108
 109       <varlistentry id="fstab-decode">
 110         <term><command>fstab-decode</command></term>
 111         <listitem>
 112           <para>Run a command with fstab-encoded arguments</para>
 113           <indexterm zone="ch-system-sysvinit fstab-decode">
 114             <primary sortas="b-fstab-decode">fstab-decode</primary>
 115           </indexterm>
 116         </listitem>
 117       </varlistentry>
 118
 119       <varlistentry id="halt">
 120         <term><command>halt</command></term>
 121         <listitem>
 122           <para>Normally invokes <command>shutdown</command> with the
 123           <parameter>-h</parameter> option, except when already in run-level 0,
 124           then it tells the kernel to halt the system; it notes in the
 125           file <filename>/var/log/wtmp</filename> that the system is being
 126           brought down</para>
 127           <indexterm zone="ch-system-sysvinit halt">
 128             <primary sortas="b-halt">halt</primary>
 129           </indexterm>
 130         </listitem>
 131       </varlistentry>
 132
 133       <varlistentry id="init">
 134         <term><command>init</command></term>
 135         <listitem>
 136           <para>The first process to be started when the kernel has initialized
 137           the hardware which takes over the boot process and starts all the
 138           proceses it is instructed to</para>
 139           <indexterm zone="ch-system-sysvinit init">
 140             <primary sortas="b-init">init</primary>
 141           </indexterm>
 142         </listitem>
 143       </varlistentry>
 144
 145       <varlistentry id="killall5">
 146         <term><command>killall5</command></term>
 147         <listitem>
 148           <para>Sends a signal to all processes, except the processes in its own
 149           session so it will not kill the shell running the script that called
 150           it</para>
 151           <indexterm zone="ch-system-sysvinit killall5">
 152             <primary sortas="b-killall5">killall5</primary>
 153           </indexterm>
 154         </listitem>
 155       </varlistentry>
 156
 157       <varlistentry id="last">
 158         <term><command>last</command></term>
 159         <listitem>
 160           <para>Shows which users last logged in (and out), searching back
 161           through the <filename>/var/log/wtmp</filename> file; it also shows
 162           system boots, shutdowns, and run-level changes</para>
 163           <indexterm zone="ch-system-sysvinit last">
 164             <primary sortas="b-last">last</primary>
 165           </indexterm>
 166         </listitem>
 167       </varlistentry>
 168
 169       <varlistentry id="lastb">
 170         <term><command>lastb</command></term>
 171         <listitem>
 172           <para>Shows the failed login attempts, as logged in
 173           <filename>/var/log/btmp</filename></para>
 174           <indexterm zone="ch-system-sysvinit lastb">
 175             <primary sortas="b-lastb">lastb</primary>
 176           </indexterm>
 177         </listitem>
 178       </varlistentry>
 179
 180       <varlistentry id="mesg">
 181         <term><command>mesg</command></term>
 182         <listitem>
 183           <para>Controls whether other users can send messages to the current
 184           user's terminal</para>
 185           <indexterm zone="ch-system-sysvinit mesg">
 186             <primary sortas="b-mesg">mesg</primary>
 187           </indexterm>
 188         </listitem>
 189       </varlistentry>
 190
 191       <varlistentry id="pidof">
 192         <term><command>pidof</command></term>
 193         <listitem>
 194           <para>Reports the PIDs of the given programs</para>
 195           <indexterm zone="ch-system-sysvinit pidof">
 196             <primary sortas="b-pidof">pidof</primary>
 197           </indexterm>
 198         </listitem>
 199       </varlistentry>
 200
 201       <varlistentry id="poweroff">
 202         <term><command>poweroff</command></term>
 203         <listitem>
 204           <para>Tells the kernel to halt the system and switch off the computer
 205           (see <command>halt</command>)</para>
 206           <indexterm zone="ch-system-sysvinit poweroff">
 207             <primary sortas="b-poweroff">poweroff</primary>
 208           </indexterm>
 209         </listitem>
 210       </varlistentry>
 211
 212       <varlistentry id="reboot">
 213         <term><command>reboot</command></term>
 214         <listitem>
 215           <para>Tells the kernel to reboot the system (see
 216           <command>halt</command>)</para>
 217           <indexterm zone="ch-system-sysvinit reboot">
 218             <primary sortas="b-reboot">reboot</primary>
 219           </indexterm>
 220         </listitem>
 221       </varlistentry>
 222
 223       <varlistentry id="runlevel">
 224         <term><command>runlevel</command></term>
 225         <listitem>
 226           <para>Reports the previous and the current run-level, as noted in the
 227           last run-level record in <filename>/var/run/utmp</filename></para>
 228           <indexterm zone="ch-system-sysvinit runlevel">
 229             <primary sortas="b-runlevel">runlevel</primary>
 230           </indexterm>
 231         </listitem>
 232       </varlistentry>
 233
 234       <varlistentry id="shutdown">
 235         <term><command>shutdown</command></term>
 236         <listitem>
 237           <para>Brings the system down in a secure way, signaling all processes
 238           and notifying all logged-in users</para>
 239           <indexterm zone="ch-system-sysvinit shutdown">
 240             <primary sortas="b-shutdown">shutdown</primary>
 241           </indexterm>
 242         </listitem>
 243       </varlistentry>
 244
 245       <varlistentry id="sulogin">
 246         <term><command>sulogin</command></term>
 247         <listitem>
 248           <para>Allows <systemitem class="username">root</systemitem> to log in;
 249           it is normally invoked by <command>init</command> when the system goes
 250           into single user mode</para>
 251           <indexterm zone="ch-system-sysvinit sulogin">
 252             <primary sortas="b-sulogin">sulogin</primary>
 253           </indexterm>
 254         </listitem>
 255       </varlistentry>
 256
 257       <varlistentry id="telinit">
 258         <term><command>telinit</command></term>
 259         <listitem>
 260           <para>Tells <command>init</command> which run-level to change to</para>
 261           <indexterm zone="ch-system-sysvinit telinit">
 262             <primary sortas="b-telinit">telinit</primary>
 263           </indexterm>
 264         </listitem>
 265       </varlistentry>
 266
 267       <varlistentry id="utmpdump">
 268         <term><command>utmpdump</command></term>
 269         <listitem>
 270           <para>Displays the content of the given login file in a more
 271           user-friendly format</para>
 272           <indexterm zone="ch-system-sysvinit utmpdump">
 273             <primary sortas="b-utmpdump">utmpdump</primary>
 274           </indexterm>
 275         </listitem>
 276       </varlistentry>
 277
 278     </variablelist>
 279
 280   </sect2>
 281
 282 </sect1>