source: chapter06/sysvinit.xml@ b188c43

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Last change on this file since b188c43 was b188c43, checked in by Bruce Dubbs <bdubbs@…>, 14 years ago

Add fstab-decode to list of progrms installed by sysvinit

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9354 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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File size: 11.3 KB
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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>A maintained version of the <command>wall</command> program was
59 installed earlier by Util-linux-ng. Suppress the installation of Sysvinit's
60 version of this program and its man page:</para>
61
62<screen><userinput remap="make">sed -i -e 's/utmpdump wall/utmpdump/' \
63 -e 's/mountpoint.1 wall.1/mountpoint.1/' src/Makefile</userinput></screen>
64
65 <para>Compile the package:</para>
66
67<screen><userinput remap="make">make -C src</userinput></screen>
68
69 <para>This package does not come with a test suite.</para>
70
71 <para>Install the package:</para>
72
73<screen><userinput remap="install">make -C src install</userinput></screen>
74
75 </sect2>
76
77 <sect2 id="conf-sysvinit" role="configuration">
78 <title>Configuring Sysvinit</title>
79
80 <indexterm zone="conf-sysvinit">
81 <primary sortas="a-Sysvinit">Sysvinit</primary>
82 <secondary>configuring</secondary>
83 </indexterm>
84
85 <indexterm zone="conf-sysvinit">
86 <primary sortas="e-/etc/inittab">/etc/inittab</primary>
87 </indexterm>
88
89 <para>Create a new file <filename>/etc/inittab</filename> by running the
90 following:</para>
91
92<screen><userinput>cat &gt; /etc/inittab &lt;&lt; "EOF"
93<literal># Begin /etc/inittab
94
95id:3:initdefault:
96
97si::sysinit:/etc/rc.d/init.d/rc sysinit
98
99l0:0:wait:/etc/rc.d/init.d/rc 0
100l1:S1:wait:/etc/rc.d/init.d/rc 1
101l2:2:wait:/etc/rc.d/init.d/rc 2
102l3:3:wait:/etc/rc.d/init.d/rc 3
103l4:4:wait:/etc/rc.d/init.d/rc 4
104l5:5:wait:/etc/rc.d/init.d/rc 5
105l6:6:wait:/etc/rc.d/init.d/rc 6
106
107ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now
108
109su:S016:once:/sbin/sulogin
110
1111:2345:respawn:/sbin/agetty tty1 9600
1122:2345:respawn:/sbin/agetty tty2 9600
1133:2345:respawn:/sbin/agetty tty3 9600
1144:2345:respawn:/sbin/agetty tty4 9600
1155:2345:respawn:/sbin/agetty tty5 9600
1166:2345:respawn:/sbin/agetty tty6 9600
117
118# End /etc/inittab</literal>
119EOF</userinput></screen>
120
121 </sect2>
122
123 <sect2 id="contents-sysvinit" role="content">
124 <title>Contents of Sysvinit</title>
125
126 <segmentedlist>
127 <segtitle>Installed programs</segtitle>
128
129 <seglistitem>
130 <seg>bootlogd, fstab-decode, halt, init, killall5, last,
131 lastb (link to last), mesg, mountpoint, pidof (link to killall5),
132 poweroff (link to halt),
133 reboot (link to halt), runlevel, shutdown, sulogin,
134 telinit (link to init), and utmpdump</seg>
135 </seglistitem>
136 </segmentedlist>
137
138 <variablelist>
139 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
140 <?dbfo list-presentation="list"?>
141 <?dbhtml list-presentation="table"?>
142
143 <varlistentry id="bootlogd">
144 <term><command>bootlogd</command></term>
145 <listitem>
146 <para>Logs boot messages to a log file</para>
147 <indexterm zone="ch-system-sysvinit bootlogd">
148 <primary sortas="b-bootlogd">bootlogd</primary>
149 </indexterm>
150 </listitem>
151 </varlistentry>
152
153 <varlistentry id="fstab-decode">
154 <term><command>fstab-decode</command></term>
155 <listitem>
156 <para>Run a command with fstab-encoded arguments</para>
157 <indexterm zone="ch-system-sysvinit fstab-decode">
158 <primary sortas="b-fstab-decode">fstab-decode</primary>
159 </indexterm>
160 </listitem>
161 </varlistentry>
162
163 <varlistentry id="halt">
164 <term><command>halt</command></term>
165 <listitem>
166 <para>Normally invokes <command>shutdown</command> with the
167 <parameter>-h</parameter> option, except when already in run-level 0,
168 then it tells the kernel to halt the system; it notes in the
169 file <filename>/var/log/wtmp</filename> that the system is being
170 brought down</para>
171 <indexterm zone="ch-system-sysvinit halt">
172 <primary sortas="b-halt">halt</primary>
173 </indexterm>
174 </listitem>
175 </varlistentry>
176
177 <varlistentry id="init">
178 <term><command>init</command></term>
179 <listitem>
180 <para>The first process to be started when the kernel has initialized
181 the hardware which takes over the boot process and starts all the
182 proceses it is instructed to</para>
183 <indexterm zone="ch-system-sysvinit init">
184 <primary sortas="b-init">init</primary>
185 </indexterm>
186 </listitem>
187 </varlistentry>
188
189 <varlistentry id="killall5">
190 <term><command>killall5</command></term>
191 <listitem>
192 <para>Sends a signal to all processes, except the processes in its own
193 session so it will not kill the shell running the script that called
194 it</para>
195 <indexterm zone="ch-system-sysvinit killall5">
196 <primary sortas="b-killall5">killall5</primary>
197 </indexterm>
198 </listitem>
199 </varlistentry>
200
201 <varlistentry id="last">
202 <term><command>last</command></term>
203 <listitem>
204 <para>Shows which users last logged in (and out), searching back
205 through the <filename>/var/log/wtmp</filename> file; it also shows
206 system boots, shutdowns, and run-level changes</para>
207 <indexterm zone="ch-system-sysvinit last">
208 <primary sortas="b-last">last</primary>
209 </indexterm>
210 </listitem>
211 </varlistentry>
212
213 <varlistentry id="lastb">
214 <term><command>lastb</command></term>
215 <listitem>
216 <para>Shows the failed login attempts, as logged in
217 <filename>/var/log/btmp</filename></para>
218 <indexterm zone="ch-system-sysvinit lastb">
219 <primary sortas="b-lastb">lastb</primary>
220 </indexterm>
221 </listitem>
222 </varlistentry>
223
224 <varlistentry id="mesg">
225 <term><command>mesg</command></term>
226 <listitem>
227 <para>Controls whether other users can send messages to the current
228 user's terminal</para>
229 <indexterm zone="ch-system-sysvinit mesg">
230 <primary sortas="b-mesg">mesg</primary>
231 </indexterm>
232 </listitem>
233 </varlistentry>
234
235 <varlistentry id="mountpoint">
236 <term><command>mountpoint</command></term>
237 <listitem>
238 <para>Checks if the directory is a mountpoint</para>
239 <indexterm zone="ch-system-sysvinit mountpoint">
240 <primary sortas="b-mountpoint">mountpoint</primary>
241 </indexterm>
242 </listitem>
243 </varlistentry>
244
245 <varlistentry id="pidof">
246 <term><command>pidof</command></term>
247 <listitem>
248 <para>Reports the PIDs of the given programs</para>
249 <indexterm zone="ch-system-sysvinit pidof">
250 <primary sortas="b-pidof">pidof</primary>
251 </indexterm>
252 </listitem>
253 </varlistentry>
254
255 <varlistentry id="poweroff">
256 <term><command>poweroff</command></term>
257 <listitem>
258 <para>Tells the kernel to halt the system and switch off the computer
259 (see <command>halt</command>)</para>
260 <indexterm zone="ch-system-sysvinit poweroff">
261 <primary sortas="b-poweroff">poweroff</primary>
262 </indexterm>
263 </listitem>
264 </varlistentry>
265
266 <varlistentry id="reboot">
267 <term><command>reboot</command></term>
268 <listitem>
269 <para>Tells the kernel to reboot the system (see
270 <command>halt</command>)</para>
271 <indexterm zone="ch-system-sysvinit reboot">
272 <primary sortas="b-reboot">reboot</primary>
273 </indexterm>
274 </listitem>
275 </varlistentry>
276
277 <varlistentry id="runlevel">
278 <term><command>runlevel</command></term>
279 <listitem>
280 <para>Reports the previous and the current run-level, as noted in the
281 last run-level record in <filename>/var/run/utmp</filename></para>
282 <indexterm zone="ch-system-sysvinit runlevel">
283 <primary sortas="b-runlevel">runlevel</primary>
284 </indexterm>
285 </listitem>
286 </varlistentry>
287
288 <varlistentry id="shutdown">
289 <term><command>shutdown</command></term>
290 <listitem>
291 <para>Brings the system down in a secure way, signaling all processes
292 and notifying all logged-in users</para>
293 <indexterm zone="ch-system-sysvinit shutdown">
294 <primary sortas="b-shutdown">shutdown</primary>
295 </indexterm>
296 </listitem>
297 </varlistentry>
298
299 <varlistentry id="sulogin">
300 <term><command>sulogin</command></term>
301 <listitem>
302 <para>Allows <systemitem class="username">root</systemitem> to log in;
303 it is normally invoked by <command>init</command> when the system goes
304 into single user mode</para>
305 <indexterm zone="ch-system-sysvinit sulogin">
306 <primary sortas="b-sulogin">sulogin</primary>
307 </indexterm>
308 </listitem>
309 </varlistentry>
310
311 <varlistentry id="telinit">
312 <term><command>telinit</command></term>
313 <listitem>
314 <para>Tells <command>init</command> which run-level to change to</para>
315 <indexterm zone="ch-system-sysvinit telinit">
316 <primary sortas="b-telinit">telinit</primary>
317 </indexterm>
318 </listitem>
319 </varlistentry>
320
321 <varlistentry id="utmpdump">
322 <term><command>utmpdump</command></term>
323 <listitem>
324 <para>Displays the content of the given login file in a more
325 user-friendly format</para>
326 <indexterm zone="ch-system-sysvinit utmpdump">
327 <primary sortas="b-utmpdump">utmpdump</primary>
328 </indexterm>
329 </listitem>
330 </varlistentry>
331
332 </variablelist>
333
334 </sect2>
335
336</sect1>
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