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Diffstat (limited to 'chapter06/sysvinit.xml')
| -rw-r--r-- | chapter06/sysvinit.xml | 191 |
1 files changed, 183 insertions, 8 deletions
diff --git a/chapter06/sysvinit.xml b/chapter06/sysvinit.xml index b3cfab986..65af49d7f 100644 --- a/chapter06/sysvinit.xml +++ b/chapter06/sysvinit.xml @@ -3,13 +3,15 @@ <!ENTITY % general-entities SYSTEM "../general.ent"> %general-entities; ]> -<sect1 id="ch-system-sysvinit" xreflabel="Sysvinit" role="wrap"> +<sect1 id="ch-system-sysvinit" role="wrap"> <title>Sysvinit-&sysvinit-version;</title> <?dbhtml filename="sysvinit.html"?> <indexterm zone="ch-system-sysvinit"><primary sortas="a-Sysvinit">Sysvinit</primary></indexterm> <sect2 role="package"><title/> +<para>The Sysvinit package contains programs for controlling the startup, +running, and shutdown of the system.</para> <segmentedlist> <segtitle>&buildtime;</segtitle> @@ -17,21 +19,34 @@ <seglistitem><seg>0.1 SBU</seg><seg> 0.9 MB</seg></seglistitem> </segmentedlist> +<segmentedlist> +<segtitle>Sysvinit installation depends on</segtitle> +<seglistitem><seg>Binutils, Coreutils, GCC, Glibc, and Make</seg></seglistitem> +</segmentedlist> </sect2> <sect2 role="installation"> <title>Installation of Sysvinit</title> -<para>Issue a sed sustitution:</para> +<para>When run-levels are changed (for example, when halting the +system), <command>init</command> sends termination signals to those +processes that <command>init</command> itself started and that should +not be running in the new run-level. While doing this, +<command>init</command> outputs messages like <quote>Sending processes +the TERM signal</quote> which seem to imply that it is sending these +signals to all currently running processes. To avoid this +misinterpretation, modify the source so that these messages read like +<quote>Sending processes started by init the TERM signal</quote> +instead:</para> <screen><userinput>sed -i 's@Sending processes@& started by init@g' \ src/init.c</userinput></screen> -<para>Compile Sysvinit:</para> +<para>Compile the package:</para> <screen><userinput>make -C src</userinput></screen> -<para>Then install it:</para> +<para>Install the package:</para> <screen><userinput>make -C src install</userinput></screen> @@ -39,8 +54,14 @@ <sect2 id="conf-sysvinit" role="configuration"><title>Configuring Sysvinit</title> +<indexterm zone="conf-sysvinit"> +<primary sortas="a-Sysvinit">Sysvinit</primary> +<secondary>configuring</secondary></indexterm> + +<indexterm zone="conf-sysvinit"><primary sortas="e-/etc/inittab">/etc/inittab</primary></indexterm> -<para>Create a <filename>/etc/inittab</filename> file:</para> +<para>Create a new file <filename>/etc/inittab</filename> by running the +following:</para> <screen><userinput>cat > /etc/inittab << "EOF" <literal># Begin /etc/inittab @@ -71,14 +92,90 @@ su:S016:once:/sbin/sulogin # End /etc/inittab</literal> EOF</userinput></screen> +<para>The <parameter>-I '\033(K'</parameter> option tells +<command>agetty</command> to send this escape sequence to the terminal +before doing anything else. This escape sequence switches the console +character set to a user-defined one, which can be modified by running +the <command>setfont</command> program. The <command>console</command> +initscript from the LFS-Bootscripts package calls the <command>setfont</command> +program during system startup. Sending this escape sequence is +necessary for people who use non-ISO 8859-1 screen fonts, but it does +not effect native English speakers.</para> + </sect2> <sect2 id="contents-sysvinit" role="content"><title>Contents of Sysvinit</title> -<para>See testing</para> +<segmentedlist> +<segtitle>Installed programs</segtitle> +<seglistitem><seg>halt, init, killall5, last, lastb (link to last), mesg, pidof (link to +killall5), poweroff (link to halt), reboot (link to halt), runlevel, shutdown, sulogin, telinit +(link to init), utmpdump, and wall</seg></seglistitem> +</segmentedlist> -<!-- This should be added to testing: +<variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead> +<?dbfo list-presentation="list"?> + +<varlistentry id="halt"> +<term><command>halt</command></term> +<listitem> +<para>Normally invokes <command>shutdown</command> with the +<parameter>-h</parameter> option, except when already in run-level 0, +then it tells the kernel to halt the system; it notes in the +file <filename>/var/log/wtmp</filename> that the system is being +brought down</para> +<indexterm zone="ch-system-sysvinit halt"><primary sortas="b-halt">halt</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="init"> +<term><command>init</command></term> +<listitem> +<para>The first process to be started when the kernel has initialized +the hardware which takes over the boot process and +starts all the proceses it is instructed to</para> +<indexterm zone="ch-system-sysvinit init"><primary sortas="b-init">init</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="killall5"> +<term><command>killall5</command></term> +<listitem> +<para>Sends a signal to all processes, except the processes in its own +session so it will not kill the shell running the script that called +it</para> +<indexterm zone="ch-system-sysvinit killall5"><primary sortas="b-killall5">killall5</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="last"> +<term><command>last</command></term> +<listitem> +<para>Shows which users last logged in (and out), +searching back through the <filename>/var/log/wtmp</filename> file; it +also shows system boots, shutdowns, and run-level changes</para> +<indexterm zone="ch-system-sysvinit last"><primary sortas="b-last">last</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="lastb"> +<term><command>lastb</command></term> +<listitem> +<para>Shows the failed login attempts, as logged in +<filename>/var/log/btmp</filename></para> +<indexterm zone="ch-system-sysvinit lastb"><primary sortas="b-lastb">lastb</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="mesg"> +<term><command>mesg</command></term> +<listitem> +<para>Controls whether other users can send messages to the current +user's terminal</para> +<indexterm zone="ch-system-sysvinit mesg"><primary sortas="b-mesg">mesg</primary></indexterm> +</listitem> +</varlistentry> <varlistentry id="mountpoint"> <term><command>mountpoint</command></term> @@ -88,8 +185,86 @@ EOF</userinput></screen> </listitem> </varlistentry> ---> +<varlistentry id="pidof"> +<term><command>pidof</command></term> +<listitem> +<para>Reports the PIDs of the given programs</para> +<indexterm zone="ch-system-sysvinit pidof"><primary sortas="b-pidof">pidof</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="poweroff"> +<term><command>poweroff</command></term> +<listitem> +<para>Tells the kernel to halt the system and switch off the computer +(see <command>halt</command>)</para> +<indexterm zone="ch-system-sysvinit poweroff"><primary sortas="b-poweroff">poweroff</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="reboot"> +<term><command>reboot</command></term> +<listitem> +<para>Tells the kernel to reboot the system (see +<command>halt</command>)</para> +<indexterm zone="ch-system-sysvinit reboot"><primary sortas="b-reboot">reboot</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="runlevel"> +<term><command>runlevel</command></term> +<listitem> +<para>Reports the previous and the current run-level, as noted in the last run-level +record in <filename>/var/run/utmp</filename></para> +<indexterm zone="ch-system-sysvinit runlevel"><primary sortas="b-runlevel">runlevel</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="shutdown"> +<term><command>shutdown</command></term> +<listitem> +<para>Brings the system down in a secure way, signaling all processes +and notifying all logged-in users</para> +<indexterm zone="ch-system-sysvinit shutdown"><primary sortas="b-shutdown">shutdown</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="sulogin"> +<term><command>sulogin</command></term> +<listitem> +<para>Allows <emphasis>root</emphasis> to log in; it is +normally invoked by <command>init</command> when the system goes into single user mode</para> +<indexterm zone="ch-system-sysvinit sulogin"><primary sortas="b-sulogin">sulogin</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="telinit"> +<term><command>telinit</command></term> +<listitem> +<para>Tells <command>init</command> which run-level to change to</para> +<indexterm zone="ch-system-sysvinit telinit"><primary sortas="b-telinit">telinit</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="utmpdump"> +<term><command>utmpdump</command></term> +<listitem> +<para>Displays the content of the given login file in a more +user-friendly format</para> +<indexterm zone="ch-system-sysvinit utmpdump"><primary sortas="b-utmpdump">utmpdump</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="wall"> +<term><command>wall</command></term> +<listitem> +<para>Writes a message to all logged-in users</para> +<indexterm zone="ch-system-sysvinit wall"><primary sortas="b-wall">wall</primary></indexterm> +</listitem> +</varlistentry> +</variablelist> </sect2> </sect1> + |