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Diffstat (limited to 'chapter06/sysvinit.xml')
| -rw-r--r-- | chapter06/sysvinit.xml | 129 |
1 files changed, 107 insertions, 22 deletions
diff --git a/chapter06/sysvinit.xml b/chapter06/sysvinit.xml index 37e0046b5..48418db53 100644 --- a/chapter06/sysvinit.xml +++ b/chapter06/sysvinit.xml @@ -1,47 +1,56 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [ + <!ENTITY % general-entities SYSTEM "../general.ent"> + %general-entities; +]> <sect1 id="ch-system-sysvinit" xreflabel="Sysvinit"> -<title>Installing Sysvinit-&sysvinit-version;</title> -<?dbhtml filename="sysvinit.html" dir="chapter06"?> +<title>Sysvinit-&sysvinit-version;</title> +<?dbhtml filename="sysvinit.html"?> + +<indexterm zone="ch-system-sysvinit"><primary sortas="a-Sysvinit">Sysvinit</primary></indexterm> <para>The Sysvinit package contains programs for controlling the startup, running, and shutdown of your system.</para> -<screen>&buildtime; &sysvinit-time; -&diskspace; &sysvinit-compsize;</screen> +<screen>&buildtime; 0.1 SBU +&diskspace; 0.9 MB</screen> + +<para>Sysvinit installation depends on: Binutils, Coreutils, GCC, Glibc, Make.</para> -&aa-sysvinit-down; -&aa-sysvinit-dep; -<sect2><title> </title><para> </para></sect2> <sect2> <title>Installation of Sysvinit</title> -<para>When runlevels are changed (for example, when halting the system), -<command>init</command> sends termination signals to those processes that it -itself started and that shouldn't be running in the new runlevel. While doing -this, <command>init</command> outputs messages like "Sending processes the TERM -signal" which seem to imply that it is sending these signals to all currently -running processes. To avoid this misinterpretation, you can modify the source -so that these messages read like "Sending processes started by init the TERM -signal" instead:</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 shouldn't 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, you can modify the source so that these messages read like +<quote>Sending processes started by init the TERM signal</quote> instead:</para> <screen><userinput>cp src/init.c{,.backup} sed 's/Sending processes/& started by init/g' \ - src/init.c.backup > src/init.c</userinput></screen> + src/init.c.backup > src/init.c</userinput></screen> <para>Compile Sysvinit:</para> <screen><userinput>make -C src</userinput></screen> -<para>And install it:</para> +<para>Then install it:</para> <screen><userinput>make -C src install</userinput></screen> </sect2> -<sect2><title> </title><para> </para></sect2> -<sect2><title>Configuring Sysvinit</title> +<sect2 id="conf-sysvinit"><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 new <filename>/etc/inittab</filename> file by running the following:</para> @@ -77,8 +86,84 @@ su:S016:once:/sbin/sulogin </sect2> -&aa-sysvinit-shortdesc; -&aa-sysvinit-desc; -</sect1> +<sect2 id="contents-sysvinit"><title>Contents of Sysvinit</title> + +<para><emphasis>Installed programs</emphasis>: 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</para> + +</sect2> + + +<sect2><title>Short descriptions</title> + +<indexterm zone="ch-system-sysvinit halt"><primary sortas="b-halt">halt</primary></indexterm> +<para id="halt"><command>halt</command> normally invokes shutdown with the -h flag, +except when already in run-level 0, then it tells the kernel to halt the system. +But first it notes in the file <filename>/var/log/wtmp</filename> that the +system is being brought down.</para> + +<indexterm zone="ch-system-sysvinit init"><primary sortas="b-init">init</primary></indexterm> +<para id="init"><command>init</command> is the mother of all processes. It reads its +commands from <filename>/etc/inittab</filename>, which normally tell it which +scripts to run for which run-level, and how many gettys to spawn.</para> + +<indexterm zone="ch-system-sysvinit killall5"><primary sortas="b-killall5">killall5</primary></indexterm> +<para id="killall5"><command>killall5</command> sends a signal to all processes, except +the processes in its own session -- so it won't kill the shell running the +script that called it.</para> + +<indexterm zone="ch-system-sysvinit last"><primary sortas="b-last">last</primary></indexterm> +<para id="last"><command>last</command> shows which users last logged in (and out), +searching back through the file <filename>/var/log/wtmp</filename>. It can +also show system boots and shutdowns, and run-level changes.</para> + +<indexterm zone="ch-system-sysvinit lastb"><primary sortas="b-lastb">lastb</primary></indexterm> +<para id="lastb"><command>lastb</command> shows the failed login attempts, as logged +in <filename>/var/log/btmp</filename>.</para> + +<indexterm zone="ch-system-sysvinit mesg"><primary sortas="b-mesg">mesg</primary></indexterm> +<para id="mesg"><command>mesg</command> controls whether other users can send +messages to the current user's terminal.</para> +<indexterm zone="ch-system-sysvinit pidof"><primary sortas="b-pidof">pidof</primary></indexterm> +<para id="pidof"><command>pidof</command> reports the PIDs of the given programs.</para> + +<indexterm zone="ch-system-sysvinit poweroff"><primary sortas="b-poweroff">poweroff</primary></indexterm> +<para id="poweroff"><command>poweroff</command> tells the kernel to halt the system and +switch off the computer. But see halt.</para> + +<indexterm zone="ch-system-sysvinit reboot"><primary sortas="b-reboot">reboot</primary></indexterm> +<para id="reboot"><command>reboot</command> tells the kernel to reboot the system. +But see halt.</para> + +<indexterm zone="ch-system-sysvinit runlevel"><primary sortas="b-runlevel">runlevel</primary></indexterm> +<para id="runlevel"><command>runlevel</command> 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 shutdown"><primary sortas="b-shutdown">shutdown</primary></indexterm> +<para id="shutdown"><command>shutdown</command> brings the system down in a secure way, +signaling all processes and notifying all logged-in users.</para> + +<indexterm zone="ch-system-sysvinit sulogin"><primary sortas="b-sulogin">sulogin</primary></indexterm> +<para id="sulogin"><command>sulogin</command> allows the superuser to log in. It is +normally invoked by init when the system goes into single user mode.</para> + +<indexterm zone="ch-system-sysvinit telinit"><primary sortas="b-telinit">telinit</primary></indexterm> +<para id="telinit"><command>telinit</command> tells init which run-level to enter.</para> + +<indexterm zone="ch-system-sysvinit utmpdump"><primary sortas="b-utmpdump">utmpdump</primary></indexterm> +<para id="utmpdump"><command>utmpdump</command> displays the content of the given login +file in a friendlier format.</para> + +<indexterm zone="ch-system-sysvinit wall"><primary sortas="b-wall">wall</primary></indexterm> +<para id="wall"><command>wall</command> writes a message to all logged-in users.</para> + +</sect2> + + + +</sect1> |