source: chapter06/glibc.xml@ b2b9fd6

7.5-systemd 7.6-systemd 7.7-systemd 7.8-systemd 7.9-systemd
Last change on this file since b2b9fd6 was b2b9fd6, checked in by Krejzi <krejzi@…>, 10 years ago

Make use of libnss_myhostname shipped by systemd

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/branches/systemd/BOOK@10438 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-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-system-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Glibc package contains the main C library. This library provides
27 the basic routines for allocating memory, searching directories, opening and
28 closing files, reading and writing files, string handling, pattern matching,
29 arithmetic, and so on.</para>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-ch6-sbu;</seg>
37 <seg>&glibc-ch6-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <note>
47 <para>Some packages outside of LFS suggest installing GNU libiconv in
48 order to translate data from one encoding to another. The project's
49 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
50 <quote>This library provides an <function>iconv()</function>
51 implementation, for use on systems which don't have one, or whose
52 implementation cannot convert from/to Unicode.</quote> Glibc provides
53 an <function>iconv()</function> implementation and can convert from/to
54 Unicode, therefore libiconv is not required on an LFS system.</para>
55 </note>
56
57 <para>The Glibc build system is self-contained and will install
58 perfectly, even though the compiler specs file and linker are still
59 pointing at <filename class="directory">/tools</filename>. The specs
60 and linker cannot be adjusted before the Glibc install because the
61 Glibc autoconf tests would give false results and defeat the goal
62 of achieving a clean build.</para>
63
64 <para>An upstream change needs to be reverted:</para>
65
66<screen><userinput remap="pre">sed -i -e 's/static __m128i/inline &amp;/' sysdeps/x86_64/multiarch/strstr.c</userinput></screen>
67
68 <para>Allow Glibc to be built with Make-&make-version;:</para>
69
70<screen><userinput remap="pre">sed -r -i 's/(3..89..)/\1 | 4.*/' configure</userinput></screen>
71
72 <para>Some of the Glibc programs use non-FHS compilant
73 <filename class="directory">/var/db</filename> directory
74 to store their runtime data. Apply the following patch to make such programs
75 store their runtime data in the FHS-compliant locations:</para>
76
77<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
78
79 <para>The Glibc documentation recommends building Glibc outside of the source
80 directory in a dedicated build directory:</para>
81
82<screen><userinput remap="pre">mkdir -v ../glibc-build
83cd ../glibc-build</userinput></screen>
84
85 <para>Prepare Glibc for compilation:</para>
86
87<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
88 --prefix=/usr \
89 --disable-profile \
90 --enable-kernel=&min-kernel; \
91 --libexecdir=/usr/lib</userinput></screen>
92
93 <variablelist>
94 <title>The meaning of the new configure options:</title>
95
96 <varlistentry>
97 <term><parameter>--libexecdir=/usr/lib</parameter></term>
98 <listitem>
99 <para>This changes the location of some auxillary files from the
100 default of <filename class="directory">/usr/libexec</filename> to
101 <filename class="directory">/usr/lib</filename>.</para>
102 </listitem>
103 </varlistentry>
104
105 </variablelist>
106
107 <para>Compile the package:</para>
108
109<screen><userinput remap="make">make</userinput></screen>
110
111 <important>
112 <para>In this section, the test suite for Glibc is considered critical.
113 Do not skip it under any circumstance.</para>
114 </important>
115
116 <para>Generally a few tests do not pass, but you can generally ignore
117 any of the test failures listed below. Now test the build results:</para>
118
119<screen><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log
120grep Error glibc-check-log</userinput></screen>
121
122 <para>You will probably see an expected (ignored) failure in the
123 <emphasis>posix/annexc</emphasis> and
124 <emphasis>conform/run-conformtest</emphasis> tests. In addition the Glibc
125 test suite is somewhat dependent on the host system. This is a list of the
126 most common issues:</para>
127
128 <itemizedlist>
129
130 <listitem>
131 <para>The <emphasis>nptl/tst-clock2</emphasis>,
132 <emphasis>nptl/tst-attr3</emphasis>,
133 <emphasis>tst/tst-cputimer1</emphasis>, and
134 <emphasis>rt/tst-cpuclock2</emphasis>
135 tests have been known to fail. The
136 reason is not completely understood, but indications are that minor
137 timing issues can trigger these failures.</para>
138 </listitem>
139
140 <listitem>
141 <para>The math tests sometimes fail when running on
142 systems where the CPU is not a relatively new genuine Intel or
143 authentic AMD processor.</para>
144 </listitem>
145
146 <listitem>
147 <para>When running on older and slower hardware or on systems under
148 load, some tests can fail because of test timeouts being exceeded.
149 Modifying the make check command to set a TIMEOUTFACTOR is reported to
150 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
151 make -k check</command>).</para>
152 </listitem>
153
154 <listitem>
155 <para>posix/tst-getaddrinfo4 will always fail due to not having a network
156 connection when the test is run.</para>
157 </listitem>
158
159 <listitem>
160 <para>Other tests known to fail on some architectures are posix/bug-regex32,
161 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, and stdio-common/bug22.</para>
162 </listitem>
163
164 </itemizedlist>
165
166 <para>Though it is a harmless message, the install stage of Glibc will
167 complain about the absence of <filename>/etc/ld.so.conf</filename>.
168 Prevent this warning with:</para>
169
170<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
171
172 <para>Install the package:</para>
173
174<screen><userinput remap="install">make install</userinput></screen>
175
176 <para>Install NIS and RPC related headers that are not installed by
177 default; these are required to rebuild glibc and by several BLFS
178 packages:</para>
179
180<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/sunrpc/rpc/*.h /usr/include/rpc
181cp -v ../glibc-&glibc-version;/sunrpc/rpcsvc/*.h /usr/include/rpcsvc
182cp -v ../glibc-&glibc-version;/nis/rpcsvc/*.h /usr/include/rpcsvc</userinput></screen>
183
184 <para>Install the configuration file and runtime directory for
185 <command>nscd</command>:</para>
186
187<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
188mkdir -pv /var/cache/nscd</userinput></screen>
189
190 <para>The locales that can make the system respond in a different language
191 were not installed by the above command. None of the locales are required,
192 but if some of them are missing, test suites of the future packages would
193 skip important testcases.</para>
194
195 <para>Individual locales can be installed using the
196 <command>localedef</command> program. E.g., the first
197 <command>localedef</command> command below combines the
198 <filename>/usr/share/i18n/locales/cs_CZ</filename>
199 charset-independent locale definition with the
200 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
201 charmap definition and appends the result to the
202 <filename>/usr/lib/locale/locale-archive</filename> file.
203 The following instructions will install the minimum set of
204 locales necessary for the optimal coverage of tests:</para>
205
206<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
207localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
208localedef -i de_DE -f ISO-8859-1 de_DE
209localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
210localedef -i de_DE -f UTF-8 de_DE.UTF-8
211localedef -i en_GB -f UTF-8 en_GB.UTF-8
212localedef -i en_HK -f ISO-8859-1 en_HK
213localedef -i en_PH -f ISO-8859-1 en_PH
214localedef -i en_US -f ISO-8859-1 en_US
215localedef -i en_US -f UTF-8 en_US.UTF-8
216localedef -i es_MX -f ISO-8859-1 es_MX
217localedef -i fa_IR -f UTF-8 fa_IR
218localedef -i fr_FR -f ISO-8859-1 fr_FR
219localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
220localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
221localedef -i it_IT -f ISO-8859-1 it_IT
222localedef -i it_IT -f UTF-8 it_IT.UTF-8
223localedef -i ja_JP -f EUC-JP ja_JP
224localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
225localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
226localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
227localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
228
229 <para>In addition, install the locale for your own country, language and
230 character set.</para>
231
232 <para>Alternatively, install all locales listed in the
233 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
234 (it includes every locale listed above and many more) at once with the
235 following time-consuming command:</para>
236
237<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
238
239 <para>Then use the <command>localedef</command> command to create and
240 install locales not listed in the
241 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
242 in the unlikely case you need them.</para>
243
244 </sect2>
245
246 <sect2 id="conf-glibc" role="configuration">
247 <title>Configuring Glibc</title>
248
249 <indexterm zone="conf-glibc">
250 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
251 </indexterm>
252
253 <indexterm zone="conf-glibc">
254 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
255 </indexterm>
256
257 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
258 because, although Glibc provides defaults when this file is missing or corrupt,
259 the Glibc defaults do not work well in a networked environment. The time zone
260 also needs to be configured.</para>
261
262 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
263 following:</para>
264
265<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
266<literal># Begin /etc/nsswitch.conf
267
268passwd: files
269group: files
270shadow: files
271
272hosts: files dns myhostname
273networks: files
274
275protocols: files
276services: files
277ethers: files
278rpc: files
279
280# End /etc/nsswitch.conf</literal>
281EOF</userinput></screen>
282
283 <para>Install timezone data:</para>
284<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
285
286ZONEINFO=/usr/share/zoneinfo
287mkdir -pv $ZONEINFO/{posix,right}
288
289for tz in etcetera southamerica northamerica europe africa antarctica \
290 asia australasia backward pacificnew systemv; do
291 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
292 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
293 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
294done
295
296cp -v zone.tab iso3166.tab $ZONEINFO
297zic -d $ZONEINFO -p America/New_York
298unset ZONEINFO</userinput></screen>
299
300 <variablelist>
301 <title>The meaning of the zic commands:</title>
302
303 <varlistentry>
304 <term><parameter>zic -L /dev/null ...</parameter></term>
305 <listitem>
306 <para>This creates posix timezones, without any leap seconds. It is
307 conventional to put these in both
308 <filename class="directory">zoneinfo</filename> and
309 <filename class="directory">zoneinfo/posix</filename>. It is
310 necessary to put the POSIX timezones in
311 <filename class="directory">zoneinfo</filename>, otherwise various
312 test-suites will report errors. On an embedded system, where space is
313 tight and you do not intend to ever update the timezones, you could save
314 1.9MB by not using the <filename class="directory">posix</filename>
315 directory, but some applications or test-suites might give less good
316 results</para>
317 </listitem>
318 </varlistentry>
319 <varlistentry>
320 <term><parameter>zic -L leapseconds ...</parameter></term>
321 <listitem>
322 <para>This creates right timezones, including leap seconds. On an
323 embedded system, where space is tight and you do not intend to
324 ever update the timezones, or care about the correct time, you could
325 save 1.9MB by omitting the <filename class="directory">right</filename>
326 directory.</para>
327 </listitem>
328 </varlistentry>
329 <varlistentry>
330 <term><parameter>zic ... -p ...</parameter></term>
331 <listitem>
332 <para>This creates the <filename>posixrules</filename> file. We use
333 New York because POSIX requires the daylight savings time rules
334 to be in accordance with US rules.</para>
335 </listitem>
336 </varlistentry>
337 </variablelist>
338
339
340 <para>One way to determine the local time zone is to run the following
341 script:</para>
342
343<screen role="nodump"><userinput>tzselect</userinput></screen>
344
345 <para>After answering a few questions about the location, the script will
346 output the name of the time zone (e.g.,
347 <emphasis>America/Edmonton</emphasis>). There are also some other possible
348 timezones listed in <filename
349 class='directory'>/usr/share/zoneinfo</filename> such as
350 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
351 are not identified by the script but can be used.</para>
352
353 <para>Then create the <filename>/etc/localtime</filename> file by
354 running:</para>
355
356<screen><userinput>ln -sv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
357
358 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
359 time zone selected (e.g., Canada/Eastern).</para>
360
361 </sect2>
362
363 <sect2 id="conf-ld" role="configuration">
364 <title>Configuring the Dynamic Loader</title>
365
366 <indexterm zone="conf-ld">
367 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
368 </indexterm>
369
370 <para>By default, the dynamic loader (<filename
371 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
372 <filename class="directory">/lib</filename> and <filename
373 class="directory">/usr/lib</filename> for dynamic libraries that are
374 needed by programs as they are run. However, if there are libraries in
375 directories other than <filename class="directory">/lib</filename> and
376 <filename class="directory">/usr/lib</filename>, these need to be added
377 to the <filename>/etc/ld.so.conf</filename> file in order for the
378 dynamic loader to find them. Two directories that are commonly known
379 to contain additional libraries are <filename
380 class="directory">/usr/local/lib</filename> and <filename
381 class="directory">/opt/lib</filename>, so add those directories to the
382 dynamic loader's search path.</para>
383
384 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
385 following:</para>
386
387<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
388<literal># Begin /etc/ld.so.conf
389/usr/local/lib
390/opt/lib
391</literal>
392EOF</userinput></screen>
393
394 <para>If desired, the dynamic loader can also search a directory and
395 include the contents of files found there. Generally the files in
396 this include directory are one line specifying the desired library path.
397 To add this capability run the following commands:</para>
398
399<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
400<literal># Add an include directory
401include /etc/ld.so.conf.d/*.conf
402</literal>
403EOF
404mkdir -pv /etc/ld.so.conf.d</userinput></screen>
405
406 </sect2>
407
408 <sect2 id="contents-glibc" role="content">
409 <title>Contents of Glibc</title>
410
411 <segmentedlist>
412 <segtitle>Installed programs</segtitle>
413 <segtitle>Installed libraries</segtitle>
414 <segtitle>Installed directories</segtitle>
415
416 <seglistitem>
417 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
418 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
419 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
420 zdump, and zic</seg>
421 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
422 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
423 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
424 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
425 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
426 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
427 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
428 libthread_db.so, and libutil.{a,so}</seg>
429 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
430 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
431 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
432 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
433 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
434 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
435 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/getconf,
436 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo, /var/cache/nscd,
437 and /var/lib/nss_db</seg>
438 </seglistitem>
439 </segmentedlist>
440
441 <variablelist>
442 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
443 <?dbfo list-presentation="list"?>
444 <?dbhtml list-presentation="table"?>
445
446 <varlistentry id="catchsegv">
447 <term><command>catchsegv</command></term>
448 <listitem>
449 <para>Can be used to create a stack trace when a program
450 terminates with a segmentation fault</para>
451 <indexterm zone="ch-system-glibc catchsegv">
452 <primary sortas="b-catchsegv">catchsegv</primary>
453 </indexterm>
454 </listitem>
455 </varlistentry>
456
457 <varlistentry id="gencat">
458 <term><command>gencat</command></term>
459 <listitem>
460 <para>Generates message catalogues</para>
461 <indexterm zone="ch-system-glibc gencat">
462 <primary sortas="b-gencat">gencat</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="getconf">
468 <term><command>getconf</command></term>
469 <listitem>
470 <para>Displays the system configuration values for file system
471 specific variables</para>
472 <indexterm zone="ch-system-glibc getconf">
473 <primary sortas="b-getconf">getconf</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="getent">
479 <term><command>getent</command></term>
480 <listitem>
481 <para>Gets entries from an administrative database</para>
482 <indexterm zone="ch-system-glibc getent">
483 <primary sortas="b-getent">getent</primary>
484 </indexterm>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry id="iconv">
489 <term><command>iconv</command></term>
490 <listitem>
491 <para>Performs character set conversion</para>
492 <indexterm zone="ch-system-glibc iconv">
493 <primary sortas="b-iconv">iconv</primary>
494 </indexterm>
495 </listitem>
496 </varlistentry>
497
498 <varlistentry id="iconvconfig">
499 <term><command>iconvconfig</command></term>
500 <listitem>
501 <para>Creates fastloading <command>iconv</command> module configuration
502 files</para>
503 <indexterm zone="ch-system-glibc iconvconfig">
504 <primary sortas="b-iconvconfig">iconvconfig</primary>
505 </indexterm>
506 </listitem>
507 </varlistentry>
508
509 <varlistentry id="ldconfig">
510 <term><command>ldconfig</command></term>
511 <listitem>
512 <para>Configures the dynamic linker runtime bindings</para>
513 <indexterm zone="ch-system-glibc ldconfig">
514 <primary sortas="b-ldconfig">ldconfig</primary>
515 </indexterm>
516 </listitem>
517 </varlistentry>
518
519 <varlistentry id="ldd">
520 <term><command>ldd</command></term>
521 <listitem>
522 <para>Reports which shared libraries are required
523 by each given program or shared library</para>
524 <indexterm zone="ch-system-glibc ldd">
525 <primary sortas="b-ldd">ldd</primary>
526 </indexterm>
527 </listitem>
528 </varlistentry>
529
530 <varlistentry id="lddlibc4">
531 <term><command>lddlibc4</command></term>
532 <listitem>
533 <para>Assists <command>ldd</command> with object files</para>
534 <indexterm zone="ch-system-glibc lddlibc4">
535 <primary sortas="b-lddlibc4">lddlibc4</primary>
536 </indexterm>
537 </listitem>
538 </varlistentry>
539
540 <varlistentry id="locale">
541 <term><command>locale</command></term>
542 <listitem>
543 <para>Prints various information about the current locale</para>
544 <indexterm zone="ch-system-glibc locale">
545 <primary sortas="b-locale">locale</primary>
546 </indexterm>
547 </listitem>
548 </varlistentry>
549
550 <varlistentry id="localedef">
551 <term><command>localedef</command></term>
552 <listitem>
553 <para>Compiles locale specifications</para>
554 <indexterm zone="ch-system-glibc localedef">
555 <primary sortas="b-localedef">localedef</primary>
556 </indexterm>
557 </listitem>
558 </varlistentry>
559
560 <varlistentry id="makedb">
561 <term><command>makedb</command></term>
562 <listitem>
563 <para>Creates a simple database from textual input</para>
564 <indexterm zone="ch-system-glibc makedb">
565 <primary sortas="b-makedb">makedb</primary>
566 </indexterm>
567 </listitem>
568 </varlistentry>
569
570 <varlistentry id="mtrace">
571 <term><command>mtrace</command></term>
572 <listitem>
573 <para>Reads and interprets a memory trace file and displays a summary
574 in human-readable format</para>
575 <indexterm zone="ch-system-glibc mtrace">
576 <primary sortas="b-mtrace">mtrace</primary>
577 </indexterm>
578 </listitem>
579 </varlistentry>
580
581 <varlistentry id="nscd">
582 <term><command>nscd</command></term>
583 <listitem>
584 <para>A daemon that provides a cache for the most common name
585 service requests</para>
586 <indexterm zone="ch-system-glibc nscd">
587 <primary sortas="b-nscd">nscd</primary>
588 </indexterm>
589 </listitem>
590 </varlistentry>
591
592 <varlistentry id="pcprofiledump">
593 <term><command>pcprofiledump</command></term>
594 <listitem>
595 <para>Dumps information generated by PC profiling</para>
596 <indexterm zone="ch-system-glibc pcprofiledump">
597 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
598 </indexterm>
599 </listitem>
600 </varlistentry>
601
602 <varlistentry id="pldd">
603 <term><command>pldd</command></term>
604 <listitem>
605 <para>Lists dynamic shared objects used by running processes</para>
606 <indexterm zone="ch-system-glibc pldd">
607 <primary sortas="b-pldd">pldd</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611<!--
612 <varlistentry id="pt_chown">
613 <term><command>pt_chown</command></term>
614 <listitem>
615 <para>A helper program for <command>grantpt</command> to set the owner,
616 group and access permissions of a slave pseudo terminal</para>
617 <indexterm zone="ch-system-glibc pt_chown">
618 <primary sortas="b-pt_chown">pt_chown</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622-->
623 <varlistentry id="rpcgen">
624 <term><command>rpcgen</command></term>
625 <listitem>
626 <para>Generates C code to implement the Remote Procedure Call (RPC)
627 protocol</para>
628 <indexterm zone="ch-system-glibc rpcgen">
629 <primary sortas="b-rpcgen">rpcgen</primary>
630 </indexterm>
631 </listitem>
632 </varlistentry>
633
634 <varlistentry id="sln">
635 <term><command>sln</command></term>
636 <listitem>
637 <para>A statically linked <command>ln</command> program</para>
638 <indexterm zone="ch-system-glibc sln">
639 <primary sortas="b-sln">sln</primary>
640 </indexterm>
641 </listitem>
642 </varlistentry>
643
644 <varlistentry id="sotruss">
645 <term><command>sotruss</command></term>
646 <listitem>
647 <para>Traces shared library procedure calls of a specified command</para>
648 <indexterm zone="ch-system-glibc sotruss">
649 <primary sortas="b-sotruss">sotruss</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 <varlistentry id="sprof">
655 <term><command>sprof</command></term>
656 <listitem>
657 <para>Reads and displays shared object profiling data</para>
658 <indexterm zone="ch-system-glibc sprof">
659 <primary sortas="b-sprof">sprof</primary>
660 </indexterm>
661 </listitem>
662 </varlistentry>
663
664 <varlistentry id="tzselect">
665 <term><command>tzselect</command></term>
666 <listitem>
667 <para>Asks the user about the location of the system and reports
668 the corresponding time zone description</para>
669 <indexterm zone="ch-system-glibc tzselect">
670 <primary sortas="b-tzselect">tzselect</primary>
671 </indexterm>
672 </listitem>
673 </varlistentry>
674
675 <varlistentry id="xtrace">
676 <term><command>xtrace</command></term>
677 <listitem>
678 <para>Traces the execution of a program by printing the currently
679 executed function</para>
680 <indexterm zone="ch-system-glibc xtrace">
681 <primary sortas="b-xtrace">xtrace</primary>
682 </indexterm>
683 </listitem>
684 </varlistentry>
685
686 <varlistentry id="zdump">
687 <term><command>zdump</command></term>
688 <listitem>
689 <para>The time zone dumper</para>
690 <indexterm zone="ch-system-glibc zdump">
691 <primary sortas="b-zdump">zdump</primary>
692 </indexterm>
693 </listitem>
694 </varlistentry>
695
696 <varlistentry id="zic">
697 <term><command>zic</command></term>
698 <listitem>
699 <para>The time zone compiler</para>
700 <indexterm zone="ch-system-glibc zic">
701 <primary sortas="b-zic">zic</primary>
702 </indexterm>
703 </listitem>
704 </varlistentry>
705
706 <varlistentry id="ld.so">
707 <term><filename class="libraryfile">ld.so</filename></term>
708 <listitem>
709 <para>The helper program for shared library executables</para>
710 <indexterm zone="ch-system-glibc ld.so">
711 <primary sortas="c-ld.so">ld.so</primary>
712 </indexterm>
713 </listitem>
714 </varlistentry>
715
716 <varlistentry id="libBrokenLocale">
717 <term><filename class="libraryfile">libBrokenLocale</filename></term>
718 <listitem>
719 <para>Used internally by Glibc as a gross hack to get broken programs
720 (e.g., some Motif applications) running. See comments in
721 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
722 for more information</para>
723 <indexterm zone="ch-system-glibc libBrokenLocale">
724 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
725 </indexterm>
726 </listitem>
727 </varlistentry>
728
729 <varlistentry id="libSegFault">
730 <term><filename class="libraryfile">libSegFault</filename></term>
731 <listitem>
732 <para>The segmentation fault signal handler, used by
733 <command>catchsegv</command></para>
734 <indexterm zone="ch-system-glibc libSegFault">
735 <primary sortas="c-libSegFault">libSegFault</primary>
736 </indexterm>
737 </listitem>
738 </varlistentry>
739
740 <varlistentry id="libanl">
741 <term><filename class="libraryfile">libanl</filename></term>
742 <listitem>
743 <para>An asynchronous name lookup library</para>
744 <indexterm zone="ch-system-glibc libanl">
745 <primary sortas="c-libanl">libanl</primary>
746 </indexterm>
747 </listitem>
748 </varlistentry>
749
750 <varlistentry id="libbsd-compat">
751 <term><filename class="libraryfile">libbsd-compat</filename></term>
752 <listitem>
753 <para>Provides the portability needed in order to run certain
754 Berkeley Software Distribution (BSD) programs under Linux</para>
755 <indexterm zone="ch-system-glibc libbsd-compat">
756 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
757 </indexterm>
758 </listitem>
759 </varlistentry>
760
761 <varlistentry id="libc">
762 <term><filename class="libraryfile">libc</filename></term>
763 <listitem>
764 <para>The main C library</para>
765 <indexterm zone="ch-system-glibc libc">
766 <primary sortas="c-libc">libc</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="libcidn">
772 <term><filename class="libraryfile">libcidn</filename></term>
773 <listitem>
774 <para>Used internally by Glibc for handling internationalized domain
775 names in the <function>getaddrinfo()</function> function</para>
776 <indexterm zone="ch-system-glibc libcidn">
777 <primary sortas="c-libcidn">libcidn</primary>
778 </indexterm>
779 </listitem>
780 </varlistentry>
781
782 <varlistentry id="libcrypt">
783 <term><filename class="libraryfile">libcrypt</filename></term>
784 <listitem>
785 <para>The cryptography library</para>
786 <indexterm zone="ch-system-glibc libcrypt">
787 <primary sortas="c-libcrypt">libcrypt</primary>
788 </indexterm>
789 </listitem>
790 </varlistentry>
791
792 <varlistentry id="libdl">
793 <term><filename class="libraryfile">libdl</filename></term>
794 <listitem>
795 <para>The dynamic linking interface library</para>
796 <indexterm zone="ch-system-glibc libdl">
797 <primary sortas="c-libdl">libdl</primary>
798 </indexterm>
799 </listitem>
800 </varlistentry>
801
802 <varlistentry id="libg">
803 <term><filename class="libraryfile">libg</filename></term>
804 <listitem>
805 <para>Dummy library containing no functions. Previously was a runtime
806 library for <command>g++</command></para>
807 <indexterm zone="ch-system-glibc libg">
808 <primary sortas="c-libg">libg</primary>
809 </indexterm>
810 </listitem>
811 </varlistentry>
812
813 <varlistentry id="libieee">
814 <term><filename class="libraryfile">libieee</filename></term>
815 <listitem>
816 <para>Linking in this module forces error handling rules for math
817 functions as defined by the Institute of Electrical and Electronic
818 Engineers (IEEE). The default is POSIX.1 error handling</para>
819 <indexterm zone="ch-system-glibc libieee">
820 <primary sortas="c-libieee">libieee</primary>
821 </indexterm>
822 </listitem>
823 </varlistentry>
824
825 <varlistentry id="libm">
826 <term><filename class="libraryfile">libm</filename></term>
827 <listitem>
828 <para>The mathematical library</para>
829 <indexterm zone="ch-system-glibc libm">
830 <primary sortas="c-libm">libm</primary>
831 </indexterm>
832 </listitem>
833 </varlistentry>
834
835 <varlistentry id="libmcheck">
836 <term><filename class="libraryfile">libmcheck</filename></term>
837 <listitem>
838 <para>Turns on memory allocation checking when linked to</para>
839 <indexterm zone="ch-system-glibc libmcheck">
840 <primary sortas="c-libmcheck">libmcheck</primary>
841 </indexterm>
842 </listitem>
843 </varlistentry>
844
845 <varlistentry id="libmemusage">
846 <term><filename class="libraryfile">libmemusage</filename></term>
847 <listitem>
848 <para>Used by <command>memusage</command> to help collect
849 information about the memory usage of a program</para>
850 <indexterm zone="ch-system-glibc libmemusage">
851 <primary sortas="c-libmemusage">libmemusage</primary>
852 </indexterm>
853 </listitem>
854 </varlistentry>
855
856 <varlistentry id="libnsl">
857 <term><filename class="libraryfile">libnsl</filename></term>
858 <listitem>
859 <para>The network services library</para>
860 <indexterm zone="ch-system-glibc libnsl">
861 <primary sortas="c-libnsl">libnsl</primary>
862 </indexterm>
863 </listitem>
864 </varlistentry>
865
866 <varlistentry id="libnss">
867 <term><filename class="libraryfile">libnss</filename></term>
868 <listitem>
869 <para>The Name Service Switch libraries, containing functions for
870 resolving host names, user names, group names, aliases, services,
871 protocols, etc.</para>
872 <indexterm zone="ch-system-glibc libnss">
873 <primary sortas="c-libnss">libnss</primary>
874 </indexterm>
875 </listitem>
876 </varlistentry>
877
878 <varlistentry id="libpcprofile">
879 <term><filename class="libraryfile">libpcprofile</filename></term>
880 <listitem>
881 <para>Contains profiling functions used to track the amount of CPU
882 time spent in specific source code lines</para>
883 <indexterm zone="ch-system-glibc libpcprofile">
884 <primary sortas="c-libpcprofile">libpcprofile</primary>
885 </indexterm>
886 </listitem>
887 </varlistentry>
888
889 <varlistentry id="libpthread">
890 <term><filename class="libraryfile">libpthread</filename></term>
891 <listitem>
892 <para>The POSIX threads library</para>
893 <indexterm zone="ch-system-glibc libpthread">
894 <primary sortas="c-libpthread">libpthread</primary>
895 </indexterm>
896 </listitem>
897 </varlistentry>
898
899 <varlistentry id="libresolv">
900 <term><filename class="libraryfile">libresolv</filename></term>
901 <listitem>
902 <para>Contains functions for creating, sending, and interpreting
903 packets to the Internet domain name servers</para>
904 <indexterm zone="ch-system-glibc libresolv">
905 <primary sortas="c-libresolv">libresolv</primary>
906 </indexterm>
907 </listitem>
908 </varlistentry>
909
910 <varlistentry id="librpcsvc">
911 <term><filename class="libraryfile">librpcsvc</filename></term>
912 <listitem>
913 <para>Contains functions providing miscellaneous RPC services</para>
914 <indexterm zone="ch-system-glibc librpcsvc">
915 <primary sortas="c-librpcsvc">librpcsvc</primary>
916 </indexterm>
917 </listitem>
918 </varlistentry>
919
920 <varlistentry id="librt">
921 <term><filename class="libraryfile">librt</filename></term>
922 <listitem>
923 <para>Contains functions providing most of the interfaces specified
924 by the POSIX.1b Realtime Extension</para>
925 <indexterm zone="ch-system-glibc librt">
926 <primary sortas="c-librt">librt</primary>
927 </indexterm>
928 </listitem>
929 </varlistentry>
930
931 <varlistentry id="libthread_db">
932 <term><filename class="libraryfile">libthread_db</filename></term>
933 <listitem>
934 <para>Contains functions useful for building debuggers for
935 multi-threaded programs</para>
936 <indexterm zone="ch-system-glibc libthread_db">
937 <primary sortas="c-libthread_db">libthread_db</primary>
938 </indexterm>
939 </listitem>
940 </varlistentry>
941
942 <varlistentry id="libutil">
943 <term><filename class="libraryfile">libutil</filename></term>
944 <listitem>
945 <para>Contains code for <quote>standard</quote> functions used in
946 many different Unix utilities</para>
947 <indexterm zone="ch-system-glibc libutil">
948 <primary sortas="c-libutil">libutil</primary>
949 </indexterm>
950 </listitem>
951 </varlistentry>
952
953 </variablelist>
954
955 </sect2>
956
957</sect1>
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