source: chapter06/systemd.xml@ 8125d49

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Last change on this file since 8125d49 was 8125d49, checked in by Douglas R. Reno <renodr@…>, 6 years ago

Fix a build failure with glibc-2.28

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11444 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>Set up the man pages:</para>
48
49<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
50
51 <para>Remove tests that cannot be built in chroot:</para>
52
53<screen><userinput remap="pre">sed '166,$ d' -i src/resolve/meson.build</userinput></screen>
54
55 <para>Apply a patch to fix a build failure with glibc-2.28:</para>
56
57<screen><userinput remap="pre">patch -Np1 -i ../systemd-&systemd-version;-glibc_statx_fix-1.patch</userinput></screen>
58
59 <para>Remove an unneeded group,
60 <systemitem class="groupname">render</systemitem>, from the default udev
61 rules:</para>
62
63<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules/50-udev-default.rules.in</userinput></screen>
64
65 <para>Prepare systemd for compilation:</para>
66
67 <screen><userinput remap="configure">mkdir -p build
68cd build
69
70LANG=en_US.UTF-8 \
71meson --prefix=/usr \
72 --sysconfdir=/etc \
73 --localstatedir=/var \
74 -Dblkid=true \
75 -Dbuildtype=release \
76 -Ddefault-dnssec=no \
77 -Dfirstboot=false \
78 -Dinstall-tests=false \
79 -Dkill-path=/bin/kill \
80 -Dkmod-path=/bin/kmod \
81 -Dldconfig=false \
82 -Dmount-path=/bin/mount \
83 -Drootprefix= \
84 -Drootlibdir=/lib \
85 -Dsplit-usr=true \
86 -Dsulogin-path=/sbin/sulogin \
87 -Dsysusers=false \
88 -Dumount-path=/bin/umount \
89 -Db_lto=false \
90 ..</userinput></screen>
91
92 <variablelist>
93 <title>The meaning of the meson options:</title>
94
95 <varlistentry>
96 <term><parameter>-D*-path=*</parameter></term>
97 <listitem>
98 <para>These switches provide location of binaries needed by
99 systemd at runtime that have not yet been installed, or who's
100 pkgconfig files are currently only in
101 <filename>/tools/lib/pkgconfig</filename>.</para>
102 </listitem>
103 </varlistentry>
104
105 <varlistentry>
106 <term><parameter>-Ddefault-dnssec=no</parameter></term>
107 <listitem>
108 <para>This switch turns off the experimental DNSSEC support.</para>
109 </listitem>
110 </varlistentry>
111
112 <varlistentry>
113 <term><parameter>-Dfirstboot=false</parameter></term>
114 <listitem>
115 <para>This switch prevents installation of systemd
116 services responsible for setting up the system for
117 the first time. They are not useful for LFS because
118 everything is done manually.</para>
119 </listitem>
120 </varlistentry>
121
122 <varlistentry>
123 <term><parameter>-Dinstall-tests=false</parameter></term>
124 <listitem>
125 <para>This switch prevents installation of the compiled tests.</para>
126 </listitem>
127 </varlistentry>
128
129 <varlistentry>
130 <term><parameter>-Dldconfig=false</parameter></term>
131 <listitem>
132 <para>This switch prevents installation of a systemd unit that runs
133 <command>ldconfig</command> at boot, which is not useful for source
134 distributions such as LFS and makes the boot time longer. Remove it
135 if the described feature is desired.</para>
136 </listitem>
137 </varlistentry>
138
139 <varlistentry>
140 <term><parameter>-Droot*</parameter></term>
141 <listitem>
142 <para>These switches ensure that core programs and
143 shared libraries are installed in the subdirectories
144 of the root partition.</para>
145 </listitem>
146 </varlistentry>
147
148 <varlistentry>
149 <term><parameter>-Dsplit-usr=true</parameter></term>
150 <listitem>
151 <para>This switch ensures that systemd will work on
152 systems where /bin, /lib and /sbin directories are not
153 symlinks to their /usr counterparts.</para>
154 </listitem>
155 </varlistentry>
156
157 <varlistentry>
158 <term><parameter>-Dsysusers=false</parameter></term>
159 <listitem>
160 <para>This switch prevents installation of systemd
161 services responsible for setting up the
162 <filename>/etc/group</filename> and
163 <filename>/etc/passwd</filename> files. Both files
164 were created earlier in this chapter.</para>
165 </listitem>
166 </varlistentry>
167
168 </variablelist>
169
170 <para>Compile the package:</para>
171
172<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
173<!--
174 <para>To test the package, execute the following command:</para>
175
176<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
177-->
178 <para>Install the package:</para>
179
180<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
181
182 <para>Remove an unnecessary directory:</para>
183
184<screen><userinput remap="install">rm -rfv /usr/lib/rpm
185<!--
186 <para>Create the Sysvinit compatibility symlinks, so systemd is used
187 as the default init system:</para>
188
189<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
190 ln -sfv ../bin/systemctl /sbin/${tool}
191done
192ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
193
194 <para>Remove our earlier created symlink for xsltproc:</para>
195-->
196rm -f /usr/bin/xsltproc</userinput></screen>
197
198 <para>Create the <filename>/etc/machine-id</filename> file needed by
199 <command>systemd-journald</command>:</para>
200
201<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
202
203 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
204 script to allow unprivileged user logins without
205 <application>systemd-logind</application>:</para>
206
207<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
208#!/bin/bash
209rm -f /run/nologin
210EOF
211chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
212
213 </sect2>
214
215 <sect2 id="contents-systemd" role="content">
216 <title>Contents of systemd</title>
217
218 <segmentedlist>
219 <segtitle>Installed programs</segtitle>
220 <segtitle>Installed libraries</segtitle>
221 <segtitle>Installed directories</segtitle>
222
223 <seglistitem>
224 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
225 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
226 reboot, runlevel, shutdown, systemctl, systemd-analyze,
227 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
228 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
229 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
230 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
231 systemd-run, systemd-socket-activate,
232 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
233 telinit, timedatectl, and udevadm</seg>
234 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
235 libnss_resolve.so.2, libnss_systemd.so.2,
236 libsystemd.so, libsystemd-shared-231.so,
237 and libudev.so</seg>
238 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
239 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
240 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
241 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
242 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
243 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
244 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
245 </seglistitem>
246 </segmentedlist>
247
248 <variablelist>
249 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
250 <?dbfo list-presentation="list"?>
251 <?dbhtml list-presentation="table"?>
252
253 <varlistentry id="bootctl">
254 <term><command>bootctl</command></term>
255 <listitem>
256 <para>Used to query the firmware and boot manager settings</para>
257 <indexterm zone="ch-system-systemd bootctl">
258 <primary sortas="b-bootctl">bootctl</primary>
259 </indexterm>
260 </listitem>
261 </varlistentry>
262
263 <varlistentry id="busctl">
264 <term><command>busctl</command></term>
265 <listitem>
266 <para>Used to introspect and monitor the D-Bus bus</para>
267 <indexterm zone="ch-system-systemd busctl">
268 <primary sortas="b-busctl">busctl</primary>
269 </indexterm>
270 </listitem>
271 </varlistentry>
272
273 <varlistentry id="coredumpctl">
274 <term><command>coredumpctl</command></term>
275 <listitem>
276 <para>Used to retrieve coredumps from the systemd journal</para>
277 <indexterm zone="ch-system-systemd coredumpctl">
278 <primary sortas="b-coredumpctl">coredumpctl</primary>
279 </indexterm>
280 </listitem>
281 </varlistentry>
282
283 <varlistentry id="halt">
284 <term><command>halt</command></term>
285 <listitem>
286 <para>Normally invokes <command>shutdown</command> with the
287 <parameter>-h</parameter> option, except when already in run-level 0,
288 then it tells the kernel to halt the system; it notes in the
289 file <filename>/var/log/wtmp</filename> that the system is being
290 brought down</para>
291 <indexterm zone="ch-system-systemd halt">
292 <primary sortas="b-halt">halt</primary>
293 </indexterm>
294 </listitem>
295 </varlistentry>
296
297 <varlistentry id="hostnamectl">
298 <term><command>hostnamectl</command></term>
299 <listitem>
300 <para>Used to query and change the system hostname and related
301 settings</para>
302 <indexterm zone="ch-system-systemd hostnamectl">
303 <primary sortas="b-hostnamectl">hostnamectl</primary>
304 </indexterm>
305 </listitem>
306 </varlistentry>
307
308 <varlistentry id="init">
309 <term><command>init</command></term>
310 <listitem>
311 <para>The first process to be started when the kernel has initialized
312 the hardware which takes over the boot process and starts all
313 processes according to its configuration files</para>
314 <indexterm zone="ch-system-systemd init">
315 <primary sortas="b-init">init</primary>
316 </indexterm>
317 </listitem>
318 </varlistentry>
319
320 <varlistentry id="journalctl">
321 <term><command>journalctl</command></term>
322 <listitem>
323 <para>Used to query the contents of the systemd journal</para>
324 <indexterm zone="ch-system-systemd journalctl">
325 <primary sortas="b-journalctl">journalctl</primary>
326 </indexterm>
327 </listitem>
328 </varlistentry>
329
330 <varlistentry id="kernel-install">
331 <term><command>kernel-install</command></term>
332 <listitem>
333 <para>Used to add and remove kernel and initramfs images to and
334 from /boot</para>
335 <indexterm zone="ch-system-systemd kernel-install">
336 <primary sortas="b-kernel-install">kernel-install</primary>
337 </indexterm>
338 </listitem>
339 </varlistentry>
340
341 <varlistentry id="localectl">
342 <term><command>localectl</command></term>
343 <listitem>
344 <para>Used to query and change the system locale and keyboard layout
345 settings</para>
346 <indexterm zone="ch-system-systemd localectl">
347 <primary sortas="b-localectl">localectl</primary>
348 </indexterm>
349 </listitem>
350 </varlistentry>
351
352 <varlistentry id="loginctl">
353 <term><command>loginctl</command></term>
354 <listitem>
355 <para>Used to introspect and control the state of the systemd Login
356 Manager</para>
357 <indexterm zone="ch-system-systemd loginctl">
358 <primary sortas="b-loginctl">loginctl</primary>
359 </indexterm>
360 </listitem>
361 </varlistentry>
362
363 <varlistentry id="machinectl">
364 <term><command>machinectl</command></term>
365 <listitem>
366 <para>Used to introspect and control the state of the systemd Virtual
367 Machine and Container Registration Manager</para>
368 <indexterm zone="ch-system-systemd machinectl">
369 <primary sortas="b-machinectl">machinectl</primary>
370 </indexterm>
371 </listitem>
372 </varlistentry>
373
374 <varlistentry id="networkctl">
375 <term><command>networkctl</command></term>
376 <listitem>
377 <para>Used to introspect the state of the network links as seen by
378 systemd-networkd</para>
379 <indexterm zone="ch-system-systemd networkctl">
380 <primary sortas="b-networkctl">networkctl</primary>
381 </indexterm>
382 </listitem>
383 </varlistentry>
384
385 <varlistentry id="poweroff">
386 <term><command>poweroff</command></term>
387 <listitem>
388 <para>Tells the kernel to halt the system and switch off the computer
389 (see <command>halt</command>)</para>
390 <indexterm zone="ch-system-systemd poweroff">
391 <primary sortas="b-poweroff">poweroff</primary>
392 </indexterm>
393 </listitem>
394 </varlistentry>
395
396 <varlistentry id="reboot">
397 <term><command>reboot</command></term>
398 <listitem>
399 <para>Tells the kernel to reboot the system (see
400 <command>halt</command>)</para>
401 <indexterm zone="ch-system-systemd reboot">
402 <primary sortas="b-reboot">reboot</primary>
403 </indexterm>
404 </listitem>
405 </varlistentry>
406
407 <varlistentry id="runlevel">
408 <term><command>runlevel</command></term>
409 <listitem>
410 <para>Reports the previous and the current run-level, as noted in the
411 last run-level record in <filename>/var/run/utmp</filename></para>
412 <indexterm zone="ch-system-systemd runlevel">
413 <primary sortas="b-runlevel">runlevel</primary>
414 </indexterm>
415 </listitem>
416 </varlistentry>
417
418 <varlistentry id="shutdown">
419 <term><command>shutdown</command></term>
420 <listitem>
421 <para>Brings the system down in a secure way, signaling all processes
422 and notifying all logged-in users</para>
423 <indexterm zone="ch-system-systemd shutdown">
424 <primary sortas="b-shutdown">shutdown</primary>
425 </indexterm>
426 </listitem>
427 </varlistentry>
428
429 <varlistentry id="systemctl">
430 <term><command>systemctl</command></term>
431 <listitem>
432 <para>Used to introspect and control the state of the systemd system
433 and service manager</para>
434 <indexterm zone="ch-system-systemd systemctl">
435 <primary sortas="b-systemctl">systemctl</primary>
436 </indexterm>
437 </listitem>
438 </varlistentry>
439
440 <varlistentry id="systemd-analyze">
441 <term><command>systemd-analyze</command></term>
442 <listitem>
443 <para>Used to determine system boot-up performance of the current
444 boot</para>
445 <indexterm zone="ch-system-systemd systemd-analyze">
446 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
447 </indexterm>
448 </listitem>
449 </varlistentry>
450
451 <varlistentry id="systemd-ask-password">
452 <term><command>systemd-ask-password</command></term>
453 <listitem>
454 <para>Used to query a system password or passphrase from the user,
455 using a question message specified on the command line</para>
456 <indexterm zone="ch-system-systemd systemd-ask-password">
457 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
458 </indexterm>
459 </listitem>
460 </varlistentry>
461
462 <varlistentry id="systemd-cat">
463 <term><command>systemd-cat</command></term>
464 <listitem>
465 <para>Used to connect STDOUT and STDERR of a process with the Journal
466 </para>
467 <indexterm zone="ch-system-systemd systemd-cat">
468 <primary sortas="b-systemd-cat">systemd-cat</primary>
469 </indexterm>
470 </listitem>
471 </varlistentry>
472
473 <varlistentry id="systemd-cgls">
474 <term><command>systemd-cgls</command></term>
475 <listitem>
476 <para>Recursively shows the contents of the selected Linux control
477 group hierarchy in a tree</para>
478 <indexterm zone="ch-system-systemd systemd-cgls">
479 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
480 </indexterm>
481 </listitem>
482 </varlistentry>
483
484 <varlistentry id="systemd-cgtop">
485 <term><command>systemd-cgtop</command></term>
486 <listitem>
487 <para>Shows the top control groups of the local Linux control group
488 hierarchy, ordered by their CPU, memory and disk I/O load</para>
489 <indexterm zone="ch-system-systemd systemd-cgtop">
490 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
491 </indexterm>
492 </listitem>
493 </varlistentry>
494
495 <varlistentry id="systemd-delta">
496 <term><command>systemd-delta</command></term>
497 <listitem>
498 <para>Used to identify and compare configuration files in
499 <filename class="directory">/etc</filename> that override default
500 counterparts in <filename class="directory">/usr</filename></para>
501 <indexterm zone="ch-system-systemd systemd-delta">
502 <primary sortas="b-systemd-delta">systemd-delta</primary>
503 </indexterm>
504 </listitem>
505 </varlistentry>
506
507 <varlistentry id="systemd-detect-virt">
508 <term><command>systemd-detect-virt</command></term>
509 <listitem>
510 <para>Detects execution in a virtualized environment</para>
511 <indexterm zone="ch-system-systemd systemd-detect-virt">
512 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
513 </indexterm>
514 </listitem>
515 </varlistentry>
516
517 <varlistentry id="systemd-escape">
518 <term><command>systemd-escape</command></term>
519 <listitem>
520 <para>Used to escape strings for inclusion in systemd unit
521 names</para>
522 <indexterm zone="ch-system-systemd systemd-escape">
523 <primary sortas="b-systemd-escape">systemd-escape</primary>
524 </indexterm>
525 </listitem>
526 </varlistentry>
527
528 <varlistentry id="systemd-hwdb">
529 <term><command>systemd-hwdb</command></term>
530 <listitem>
531 <para>Used to manage hardware database (hwdb)</para>
532 <indexterm zone="ch-system-systemd systemd-hwdb">
533 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
534 </indexterm>
535 </listitem>
536 </varlistentry>
537
538 <varlistentry id="systemd-inhibit">
539 <term><command>systemd-inhibit</command></term>
540 <listitem>
541 <para>Used to execute a program with a shutdown, sleep or idle
542 inhibitor lock taken</para>
543 <indexterm zone="ch-system-systemd systemd-inhibit">
544 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
545 </indexterm>
546 </listitem>
547 </varlistentry>
548
549 <varlistentry id="systemd-machine-id-setup">
550 <term><command>systemd-machine-id-setup</command></term>
551 <listitem>
552 <para>Used by system installer tools to initialize the machine ID
553 stored in <filename>/etc/machine-id</filename> at install time with a
554 randomly generated ID</para>
555 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
556 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
557 </indexterm>
558 </listitem>
559 </varlistentry>
560
561 <varlistentry id="systemd-mount">
562 <term><command>systemd-mount</command></term>
563 <listitem>
564 <para>A tool to temporarily mount or auto-mount a drive.</para>
565 <indexterm zone="ch-system-systemd systemd-mount">
566 <primary sortas="b-systemd-mount">systemd-mount</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="systemd-notify">
572 <term><command>systemd-notify</command></term>
573 <listitem>
574 <para>Used by daemon scripts to notify the init system about status
575 changes</para>
576 <indexterm zone="ch-system-systemd systemd-notify">
577 <primary sortas="b-systemd-notify">systemd-notify</primary>
578 </indexterm>
579 </listitem>
580 </varlistentry>
581
582 <varlistentry id="systemd-nspawn">
583 <term><command>systemd-nspawn</command></term>
584 <listitem>
585 <para>Used to run a command or OS in a light-weight namespace
586 container</para>
587 <indexterm zone="ch-system-systemd systemd-nspawn">
588 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
589 </indexterm>
590 </listitem>
591 </varlistentry>
592
593 <varlistentry id="systemd-path">
594 <term><command>systemd-path</command></term>
595 <listitem>
596 <para>Used to query system and user paths</para>
597 <indexterm zone="ch-system-systemd systemd-path">
598 <primary sortas="b-systemd-path">systemd-path</primary>
599 </indexterm>
600 </listitem>
601 </varlistentry>
602
603 <varlistentry id="systemd-resolve">
604 <term><command>systemd-resolve</command></term>
605 <listitem>
606 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
607 resource records, and services</para>
608 <indexterm zone="ch-system-systemd systemd-resolve">
609 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
610 </indexterm>
611 </listitem>
612 </varlistentry>
613
614 <varlistentry id="systemd-run">
615 <term><command>systemd-run</command></term>
616 <listitem>
617 <para>Used to create and start a transient .service or a .scope unit
618 and run the specified command in it</para>
619 <indexterm zone="ch-system-systemd systemd-run">
620 <primary sortas="b-systemd-run">systemd-run</primary>
621 </indexterm>
622 </listitem>
623 </varlistentry>
624
625 <!-- <varlistentry id="systemd-stdio-bridge">
626 <term><command>systemd-stdio-bridge</command></term>
627 <listitem>
628 <para>To be completed</para>
629 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
630 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
631 </indexterm>
632 </listitem>
633 </varlistentry> -->
634
635 <varlistentry id="systemd-socket-activate">
636 <term><command>systemd-socket-activate</command></term>
637 <listitem>
638 <para>A tool to listen on socket devices and launch a process upon
639 connection.</para>
640 <indexterm zone="ch-system-systemd systemd-socket-activate">
641 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
642 </indexterm>
643 </listitem>
644 </varlistentry>
645
646 <varlistentry id="systemd-tmpfiles">
647 <term><command>systemd-tmpfiles</command></term>
648 <listitem>
649 <para>Creates, deletes and cleans up volatile and temporary files and
650 directories, based on the configuration file format and location
651 specified in
652 <filename class="directory">tmpfiles.d</filename> directories</para>
653 <indexterm zone="ch-system-systemd systemd-tmpfiles">
654 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
655 </indexterm>
656 </listitem>
657 </varlistentry>
658
659 <varlistentry id="systemd-tty-ask-password-agent">
660 <term><command>systemd-tty-ask-password-agent</command></term>
661 <listitem>
662 <para>Used to list or process pending systemd password requests</para>
663 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
664 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="telinit">
670 <term><command>telinit</command></term>
671 <listitem>
672 <para>Tells <command>init</command> which run-level to change
673 to</para>
674 <indexterm zone="ch-system-systemd telinit">
675 <primary sortas="b-telinit">telinit</primary>
676 </indexterm>
677 </listitem>
678 </varlistentry>
679
680 <varlistentry id="timedatectl">
681 <term><command>timedatectl</command></term>
682 <listitem>
683 <para>Used to query and change the system clock and its settings
684 </para>
685 <indexterm zone="ch-system-systemd timedatectl">
686 <primary sortas="b-timedatectl">timedatectl</primary>
687 </indexterm>
688 </listitem>
689 </varlistentry>
690
691 <varlistentry id="udevadm">
692 <term><command>udevadm</command></term>
693 <listitem>
694 <para>Generic udev administration tool: controls the udevd daemon,
695 provides info from the Udev database, monitors uevents, waits for
696 uevents to finish, tests udev configuration, and triggers uevents
697 for a given device</para>
698 <indexterm zone="ch-system-systemd udevadm">
699 <primary sortas="b-udevadm">udevadm</primary>
700 </indexterm>
701 </listitem>
702 </varlistentry>
703
704 <varlistentry id="libsystemd">
705 <term><filename class="libraryfile">libsystemd</filename></term>
706 <listitem>
707 <para>The main systemd utility library</para>
708 <indexterm zone="ch-system-systemd libsystemd">
709 <primary sortas="c-libsystemd">libsystemd</primary>
710 </indexterm>
711 </listitem>
712 </varlistentry>
713
714 <varlistentry id="libudev">
715 <term><filename class="libraryfile">libudev</filename></term>
716 <listitem>
717 <para>A library to access Udev device information</para>
718 <indexterm zone="ch-system-systemd libudev">
719 <primary sortas="c-libudev">libudev</primary>
720 </indexterm>
721 </listitem>
722 </varlistentry>
723
724 </variablelist>
725
726 </sect2>
727
728</sect1>
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