source: chapter06/systemd.xml@ 268ab92

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Last change on this file since 268ab92 was 268ab92, checked in by Bruce Dubbs <bdubbs@…>, 6 years ago

Fix PKG_CONFIG_PATH in systemd

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11476 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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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-systemd" role="wrap" revision="systemd">
9 <?dbhtml filename="systemd.html"?>
10
11 <sect1info condition="script">
12 <productname>systemd</productname>
13 <productnumber>&systemd-version;</productnumber>
14 <address>&systemd-url;</address>
15 </sect1info>
16
17 <title>Systemd-&systemd-version;</title>
18
19 <indexterm zone="ch-system-systemd">
20 <primary sortas="a-systemd">systemd</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The systemd 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>&systemd-ch6-sbu;</seg>
35 <seg>&systemd-ch6-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42
43 <para>Create a symlink to work around missing xsltproc:</para>
44
45<screen><userinput remap="pre">ln -sf /tools/bin/true /usr/bin/xsltproc</userinput></screen>
46
47 <para>Because we have not yet installed the final version of Util-Linux,
48 create links to the libraries in the approprite location:</para>
49
50<screen><userinput remap="pre">for file in /tools/lib/lib{blkid,mount,uuid}*; do
51 ln -sf $file /usr/lib/
52done</userinput></screen>
53
54 <para>Set up the man pages:</para>
55
56<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
57
58 <para>Remove tests that cannot be built in chroot:</para>
59
60<screen><userinput remap="pre">sed '166,$ d' -i src/resolve/meson.build</userinput></screen>
61
62 <para>Apply a patch to fix a build failure with glibc-2.28:</para>
63
64<screen><userinput remap="pre">patch -Np1 -i ../systemd-&systemd-version;-glibc_statx_fix-1.patch</userinput></screen>
65
66 <para>Apply a patch to fix a build failure with meson-0.48.0:</para>
67
68<screen><userinput remap="pre">patch -Np1 -i ../systemd-&systemd-version;-meson-0.48.0_fixes-1.patch</userinput></screen>
69
70 <para>Remove an unneeded group,
71 <systemitem class="groupname">render</systemitem>, from the default udev
72 rules:</para>
73
74<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules/50-udev-default.rules.in</userinput></screen>
75
76 <para>Prepare systemd for compilation:</para>
77
78 <screen><userinput remap="configure">mkdir -p build
79cd build
80
81PKG_CONFIG_PATH="/usr/lib/pkgconfig:/tools/lib/pkgconfig" \
82LANG=en_US.UTF-8 \
83meson --prefix=/usr \
84 --sysconfdir=/etc \
85 --localstatedir=/var \
86 -Dblkid=true \
87 -Dbuildtype=release \
88 -Ddefault-dnssec=no \
89 -Dfirstboot=false \
90 -Dinstall-tests=false \
91 -Dkill-path=/bin/kill \
92 -Dkmod-path=/bin/kmod \
93 -Dldconfig=false \
94 -Dmount-path=/bin/mount \
95 -Drootprefix= \
96 -Drootlibdir=/lib \
97 -Dsplit-usr=true \
98 -Dsulogin-path=/sbin/sulogin \
99 -Dsysusers=false \
100 -Dumount-path=/bin/umount \
101 -Db_lto=false \
102 ..</userinput></screen>
103
104 <variablelist>
105 <title>The meaning of the meson options:</title>
106
107 <varlistentry>
108 <term><parameter>-D*-path=*</parameter></term>
109 <listitem>
110 <para>These switches provide location of binaries needed by
111 systemd at runtime that have not yet been installed, or who's
112 pkgconfig files are currently only in
113 <filename>/tools/lib/pkgconfig</filename>.</para>
114 </listitem>
115 </varlistentry>
116
117 <varlistentry>
118 <term><parameter>-Ddefault-dnssec=no</parameter></term>
119 <listitem>
120 <para>This switch turns off the experimental DNSSEC support.</para>
121 </listitem>
122 </varlistentry>
123
124 <varlistentry>
125 <term><parameter>-Dfirstboot=false</parameter></term>
126 <listitem>
127 <para>This switch prevents installation of systemd
128 services responsible for setting up the system for
129 the first time. They are not useful for LFS because
130 everything is done manually.</para>
131 </listitem>
132 </varlistentry>
133
134 <varlistentry>
135 <term><parameter>-Dinstall-tests=false</parameter></term>
136 <listitem>
137 <para>This switch prevents installation of the compiled tests.</para>
138 </listitem>
139 </varlistentry>
140
141 <varlistentry>
142 <term><parameter>-Dldconfig=false</parameter></term>
143 <listitem>
144 <para>This switch prevents installation of a systemd unit that runs
145 <command>ldconfig</command> at boot, which is not useful for source
146 distributions such as LFS and makes the boot time longer. Remove it
147 if the described feature is desired.</para>
148 </listitem>
149 </varlistentry>
150
151 <varlistentry>
152 <term><parameter>-Droot*</parameter></term>
153 <listitem>
154 <para>These switches ensure that core programs and
155 shared libraries are installed in the subdirectories
156 of the root partition.</para>
157 </listitem>
158 </varlistentry>
159
160 <varlistentry>
161 <term><parameter>-Dsplit-usr=true</parameter></term>
162 <listitem>
163 <para>This switch ensures that systemd will work on
164 systems where /bin, /lib and /sbin directories are not
165 symlinks to their /usr counterparts.</para>
166 </listitem>
167 </varlistentry>
168
169 <varlistentry>
170 <term><parameter>-Dsysusers=false</parameter></term>
171 <listitem>
172 <para>This switch prevents installation of systemd
173 services responsible for setting up the
174 <filename>/etc/group</filename> and
175 <filename>/etc/passwd</filename> files. Both files
176 were created earlier in this chapter.</para>
177 </listitem>
178 </varlistentry>
179
180 </variablelist>
181
182 <para>Compile the package:</para>
183
184<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
185<!--
186 <para>To test the package, execute the following command:</para>
187
188<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
189-->
190 <para>Install the package:</para>
191
192<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
193
194 <para>Remove an unnecessary directory:</para>
195
196<screen><userinput remap="install">rm -rfv /usr/lib/rpm
197<!--
198 <para>Create the Sysvinit compatibility symlinks, so systemd is used
199 as the default init system:</para>
200
201<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
202 ln -sfv ../bin/systemctl /sbin/${tool}
203done
204ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
205
206 <para>Remove our earlier created symlink for xsltproc:</para>
207-->
208rm -f /usr/bin/xsltproc</userinput></screen>
209
210 <para>Create the <filename>/etc/machine-id</filename> file needed by
211 <command>systemd-journald</command>:</para>
212
213<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
214
215 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
216 script to allow unprivileged user logins without
217 <application>systemd-logind</application>:</para>
218
219<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
220#!/bin/bash
221rm -f /run/nologin
222EOF
223chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
224
225 </sect2>
226
227 <sect2 id="contents-systemd" role="content">
228 <title>Contents of systemd</title>
229
230 <segmentedlist>
231 <segtitle>Installed programs</segtitle>
232 <segtitle>Installed libraries</segtitle>
233 <segtitle>Installed directories</segtitle>
234
235 <seglistitem>
236 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
237 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
238 reboot, runlevel, shutdown, systemctl, systemd-analyze,
239 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
240 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
241 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
242 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
243 systemd-run, systemd-socket-activate,
244 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
245 telinit, timedatectl, and udevadm</seg>
246 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
247 libnss_resolve.so.2, libnss_systemd.so.2,
248 libsystemd.so, libsystemd-shared-231.so,
249 and libudev.so</seg>
250 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
251 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
252 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
253 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
254 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
255 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
256 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
257 </seglistitem>
258 </segmentedlist>
259
260 <variablelist>
261 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
262 <?dbfo list-presentation="list"?>
263 <?dbhtml list-presentation="table"?>
264
265 <varlistentry id="bootctl">
266 <term><command>bootctl</command></term>
267 <listitem>
268 <para>Used to query the firmware and boot manager settings</para>
269 <indexterm zone="ch-system-systemd bootctl">
270 <primary sortas="b-bootctl">bootctl</primary>
271 </indexterm>
272 </listitem>
273 </varlistentry>
274
275 <varlistentry id="busctl">
276 <term><command>busctl</command></term>
277 <listitem>
278 <para>Used to introspect and monitor the D-Bus bus</para>
279 <indexterm zone="ch-system-systemd busctl">
280 <primary sortas="b-busctl">busctl</primary>
281 </indexterm>
282 </listitem>
283 </varlistentry>
284
285 <varlistentry id="coredumpctl">
286 <term><command>coredumpctl</command></term>
287 <listitem>
288 <para>Used to retrieve coredumps from the systemd journal</para>
289 <indexterm zone="ch-system-systemd coredumpctl">
290 <primary sortas="b-coredumpctl">coredumpctl</primary>
291 </indexterm>
292 </listitem>
293 </varlistentry>
294
295 <varlistentry id="halt">
296 <term><command>halt</command></term>
297 <listitem>
298 <para>Normally invokes <command>shutdown</command> with the
299 <parameter>-h</parameter> option, except when already in run-level 0,
300 then it tells the kernel to halt the system; it notes in the
301 file <filename>/var/log/wtmp</filename> that the system is being
302 brought down</para>
303 <indexterm zone="ch-system-systemd halt">
304 <primary sortas="b-halt">halt</primary>
305 </indexterm>
306 </listitem>
307 </varlistentry>
308
309 <varlistentry id="hostnamectl">
310 <term><command>hostnamectl</command></term>
311 <listitem>
312 <para>Used to query and change the system hostname and related
313 settings</para>
314 <indexterm zone="ch-system-systemd hostnamectl">
315 <primary sortas="b-hostnamectl">hostnamectl</primary>
316 </indexterm>
317 </listitem>
318 </varlistentry>
319
320 <varlistentry id="init">
321 <term><command>init</command></term>
322 <listitem>
323 <para>The first process to be started when the kernel has initialized
324 the hardware which takes over the boot process and starts all
325 processes according to its configuration files</para>
326 <indexterm zone="ch-system-systemd init">
327 <primary sortas="b-init">init</primary>
328 </indexterm>
329 </listitem>
330 </varlistentry>
331
332 <varlistentry id="journalctl">
333 <term><command>journalctl</command></term>
334 <listitem>
335 <para>Used to query the contents of the systemd journal</para>
336 <indexterm zone="ch-system-systemd journalctl">
337 <primary sortas="b-journalctl">journalctl</primary>
338 </indexterm>
339 </listitem>
340 </varlistentry>
341
342 <varlistentry id="kernel-install">
343 <term><command>kernel-install</command></term>
344 <listitem>
345 <para>Used to add and remove kernel and initramfs images to and
346 from /boot</para>
347 <indexterm zone="ch-system-systemd kernel-install">
348 <primary sortas="b-kernel-install">kernel-install</primary>
349 </indexterm>
350 </listitem>
351 </varlistentry>
352
353 <varlistentry id="localectl">
354 <term><command>localectl</command></term>
355 <listitem>
356 <para>Used to query and change the system locale and keyboard layout
357 settings</para>
358 <indexterm zone="ch-system-systemd localectl">
359 <primary sortas="b-localectl">localectl</primary>
360 </indexterm>
361 </listitem>
362 </varlistentry>
363
364 <varlistentry id="loginctl">
365 <term><command>loginctl</command></term>
366 <listitem>
367 <para>Used to introspect and control the state of the systemd Login
368 Manager</para>
369 <indexterm zone="ch-system-systemd loginctl">
370 <primary sortas="b-loginctl">loginctl</primary>
371 </indexterm>
372 </listitem>
373 </varlistentry>
374
375 <varlistentry id="machinectl">
376 <term><command>machinectl</command></term>
377 <listitem>
378 <para>Used to introspect and control the state of the systemd Virtual
379 Machine and Container Registration Manager</para>
380 <indexterm zone="ch-system-systemd machinectl">
381 <primary sortas="b-machinectl">machinectl</primary>
382 </indexterm>
383 </listitem>
384 </varlistentry>
385
386 <varlistentry id="networkctl">
387 <term><command>networkctl</command></term>
388 <listitem>
389 <para>Used to introspect the state of the network links as seen by
390 systemd-networkd</para>
391 <indexterm zone="ch-system-systemd networkctl">
392 <primary sortas="b-networkctl">networkctl</primary>
393 </indexterm>
394 </listitem>
395 </varlistentry>
396
397 <varlistentry id="poweroff">
398 <term><command>poweroff</command></term>
399 <listitem>
400 <para>Tells the kernel to halt the system and switch off the computer
401 (see <command>halt</command>)</para>
402 <indexterm zone="ch-system-systemd poweroff">
403 <primary sortas="b-poweroff">poweroff</primary>
404 </indexterm>
405 </listitem>
406 </varlistentry>
407
408 <varlistentry id="reboot">
409 <term><command>reboot</command></term>
410 <listitem>
411 <para>Tells the kernel to reboot the system (see
412 <command>halt</command>)</para>
413 <indexterm zone="ch-system-systemd reboot">
414 <primary sortas="b-reboot">reboot</primary>
415 </indexterm>
416 </listitem>
417 </varlistentry>
418
419 <varlistentry id="runlevel">
420 <term><command>runlevel</command></term>
421 <listitem>
422 <para>Reports the previous and the current run-level, as noted in the
423 last run-level record in <filename>/var/run/utmp</filename></para>
424 <indexterm zone="ch-system-systemd runlevel">
425 <primary sortas="b-runlevel">runlevel</primary>
426 </indexterm>
427 </listitem>
428 </varlistentry>
429
430 <varlistentry id="shutdown">
431 <term><command>shutdown</command></term>
432 <listitem>
433 <para>Brings the system down in a secure way, signaling all processes
434 and notifying all logged-in users</para>
435 <indexterm zone="ch-system-systemd shutdown">
436 <primary sortas="b-shutdown">shutdown</primary>
437 </indexterm>
438 </listitem>
439 </varlistentry>
440
441 <varlistentry id="systemctl">
442 <term><command>systemctl</command></term>
443 <listitem>
444 <para>Used to introspect and control the state of the systemd system
445 and service manager</para>
446 <indexterm zone="ch-system-systemd systemctl">
447 <primary sortas="b-systemctl">systemctl</primary>
448 </indexterm>
449 </listitem>
450 </varlistentry>
451
452 <varlistentry id="systemd-analyze">
453 <term><command>systemd-analyze</command></term>
454 <listitem>
455 <para>Used to determine system boot-up performance of the current
456 boot</para>
457 <indexterm zone="ch-system-systemd systemd-analyze">
458 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
459 </indexterm>
460 </listitem>
461 </varlistentry>
462
463 <varlistentry id="systemd-ask-password">
464 <term><command>systemd-ask-password</command></term>
465 <listitem>
466 <para>Used to query a system password or passphrase from the user,
467 using a question message specified on the command line</para>
468 <indexterm zone="ch-system-systemd systemd-ask-password">
469 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
470 </indexterm>
471 </listitem>
472 </varlistentry>
473
474 <varlistentry id="systemd-cat">
475 <term><command>systemd-cat</command></term>
476 <listitem>
477 <para>Used to connect STDOUT and STDERR of a process with the Journal
478 </para>
479 <indexterm zone="ch-system-systemd systemd-cat">
480 <primary sortas="b-systemd-cat">systemd-cat</primary>
481 </indexterm>
482 </listitem>
483 </varlistentry>
484
485 <varlistentry id="systemd-cgls">
486 <term><command>systemd-cgls</command></term>
487 <listitem>
488 <para>Recursively shows the contents of the selected Linux control
489 group hierarchy in a tree</para>
490 <indexterm zone="ch-system-systemd systemd-cgls">
491 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
492 </indexterm>
493 </listitem>
494 </varlistentry>
495
496 <varlistentry id="systemd-cgtop">
497 <term><command>systemd-cgtop</command></term>
498 <listitem>
499 <para>Shows the top control groups of the local Linux control group
500 hierarchy, ordered by their CPU, memory and disk I/O load</para>
501 <indexterm zone="ch-system-systemd systemd-cgtop">
502 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
503 </indexterm>
504 </listitem>
505 </varlistentry>
506
507 <varlistentry id="systemd-delta">
508 <term><command>systemd-delta</command></term>
509 <listitem>
510 <para>Used to identify and compare configuration files in
511 <filename class="directory">/etc</filename> that override default
512 counterparts in <filename class="directory">/usr</filename></para>
513 <indexterm zone="ch-system-systemd systemd-delta">
514 <primary sortas="b-systemd-delta">systemd-delta</primary>
515 </indexterm>
516 </listitem>
517 </varlistentry>
518
519 <varlistentry id="systemd-detect-virt">
520 <term><command>systemd-detect-virt</command></term>
521 <listitem>
522 <para>Detects execution in a virtualized environment</para>
523 <indexterm zone="ch-system-systemd systemd-detect-virt">
524 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
525 </indexterm>
526 </listitem>
527 </varlistentry>
528
529 <varlistentry id="systemd-escape">
530 <term><command>systemd-escape</command></term>
531 <listitem>
532 <para>Used to escape strings for inclusion in systemd unit
533 names</para>
534 <indexterm zone="ch-system-systemd systemd-escape">
535 <primary sortas="b-systemd-escape">systemd-escape</primary>
536 </indexterm>
537 </listitem>
538 </varlistentry>
539
540 <varlistentry id="systemd-hwdb">
541 <term><command>systemd-hwdb</command></term>
542 <listitem>
543 <para>Used to manage hardware database (hwdb)</para>
544 <indexterm zone="ch-system-systemd systemd-hwdb">
545 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
546 </indexterm>
547 </listitem>
548 </varlistentry>
549
550 <varlistentry id="systemd-inhibit">
551 <term><command>systemd-inhibit</command></term>
552 <listitem>
553 <para>Used to execute a program with a shutdown, sleep or idle
554 inhibitor lock taken</para>
555 <indexterm zone="ch-system-systemd systemd-inhibit">
556 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
557 </indexterm>
558 </listitem>
559 </varlistentry>
560
561 <varlistentry id="systemd-machine-id-setup">
562 <term><command>systemd-machine-id-setup</command></term>
563 <listitem>
564 <para>Used by system installer tools to initialize the machine ID
565 stored in <filename>/etc/machine-id</filename> at install time with a
566 randomly generated ID</para>
567 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
568 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="systemd-mount">
574 <term><command>systemd-mount</command></term>
575 <listitem>
576 <para>A tool to temporarily mount or auto-mount a drive.</para>
577 <indexterm zone="ch-system-systemd systemd-mount">
578 <primary sortas="b-systemd-mount">systemd-mount</primary>
579 </indexterm>
580 </listitem>
581 </varlistentry>
582
583 <varlistentry id="systemd-notify">
584 <term><command>systemd-notify</command></term>
585 <listitem>
586 <para>Used by daemon scripts to notify the init system about status
587 changes</para>
588 <indexterm zone="ch-system-systemd systemd-notify">
589 <primary sortas="b-systemd-notify">systemd-notify</primary>
590 </indexterm>
591 </listitem>
592 </varlistentry>
593
594 <varlistentry id="systemd-nspawn">
595 <term><command>systemd-nspawn</command></term>
596 <listitem>
597 <para>Used to run a command or OS in a light-weight namespace
598 container</para>
599 <indexterm zone="ch-system-systemd systemd-nspawn">
600 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604
605 <varlistentry id="systemd-path">
606 <term><command>systemd-path</command></term>
607 <listitem>
608 <para>Used to query system and user paths</para>
609 <indexterm zone="ch-system-systemd systemd-path">
610 <primary sortas="b-systemd-path">systemd-path</primary>
611 </indexterm>
612 </listitem>
613 </varlistentry>
614
615 <varlistentry id="systemd-resolve">
616 <term><command>systemd-resolve</command></term>
617 <listitem>
618 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
619 resource records, and services</para>
620 <indexterm zone="ch-system-systemd systemd-resolve">
621 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625
626 <varlistentry id="systemd-run">
627 <term><command>systemd-run</command></term>
628 <listitem>
629 <para>Used to create and start a transient .service or a .scope unit
630 and run the specified command in it</para>
631 <indexterm zone="ch-system-systemd systemd-run">
632 <primary sortas="b-systemd-run">systemd-run</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <!-- <varlistentry id="systemd-stdio-bridge">
638 <term><command>systemd-stdio-bridge</command></term>
639 <listitem>
640 <para>To be completed</para>
641 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
642 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry> -->
646
647 <varlistentry id="systemd-socket-activate">
648 <term><command>systemd-socket-activate</command></term>
649 <listitem>
650 <para>A tool to listen on socket devices and launch a process upon
651 connection.</para>
652 <indexterm zone="ch-system-systemd systemd-socket-activate">
653 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry>
657
658 <varlistentry id="systemd-tmpfiles">
659 <term><command>systemd-tmpfiles</command></term>
660 <listitem>
661 <para>Creates, deletes and cleans up volatile and temporary files and
662 directories, based on the configuration file format and location
663 specified in
664 <filename class="directory">tmpfiles.d</filename> directories</para>
665 <indexterm zone="ch-system-systemd systemd-tmpfiles">
666 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
667 </indexterm>
668 </listitem>
669 </varlistentry>
670
671 <varlistentry id="systemd-tty-ask-password-agent">
672 <term><command>systemd-tty-ask-password-agent</command></term>
673 <listitem>
674 <para>Used to list or process pending systemd password requests</para>
675 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
676 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
677 </indexterm>
678 </listitem>
679 </varlistentry>
680
681 <varlistentry id="telinit">
682 <term><command>telinit</command></term>
683 <listitem>
684 <para>Tells <command>init</command> which run-level to change
685 to</para>
686 <indexterm zone="ch-system-systemd telinit">
687 <primary sortas="b-telinit">telinit</primary>
688 </indexterm>
689 </listitem>
690 </varlistentry>
691
692 <varlistentry id="timedatectl">
693 <term><command>timedatectl</command></term>
694 <listitem>
695 <para>Used to query and change the system clock and its settings
696 </para>
697 <indexterm zone="ch-system-systemd timedatectl">
698 <primary sortas="b-timedatectl">timedatectl</primary>
699 </indexterm>
700 </listitem>
701 </varlistentry>
702
703 <varlistentry id="udevadm">
704 <term><command>udevadm</command></term>
705 <listitem>
706 <para>Generic udev administration tool: controls the udevd daemon,
707 provides info from the Udev database, monitors uevents, waits for
708 uevents to finish, tests udev configuration, and triggers uevents
709 for a given device</para>
710 <indexterm zone="ch-system-systemd udevadm">
711 <primary sortas="b-udevadm">udevadm</primary>
712 </indexterm>
713 </listitem>
714 </varlistentry>
715
716 <varlistentry id="libsystemd">
717 <term><filename class="libraryfile">libsystemd</filename></term>
718 <listitem>
719 <para>The main systemd utility library</para>
720 <indexterm zone="ch-system-systemd libsystemd">
721 <primary sortas="c-libsystemd">libsystemd</primary>
722 </indexterm>
723 </listitem>
724 </varlistentry>
725
726 <varlistentry id="libudev">
727 <term><filename class="libraryfile">libudev</filename></term>
728 <listitem>
729 <para>A library to access Udev device information</para>
730 <indexterm zone="ch-system-systemd libudev">
731 <primary sortas="c-libudev">libudev</primary>
732 </indexterm>
733 </listitem>
734 </varlistentry>
735
736 </variablelist>
737
738 </sect2>
739
740</sect1>
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