source: chapter08/glibc.xml@ c91649c2

11.0 11.0-rc1 11.0-rc2 11.0-rc3 11.1 11.1-rc1 11.2 11.2-rc1 11.3 11.3-rc1 12.0 12.0-rc1 12.1 12.1-rc1 arm bdubbs/gcc13 ml-11.0 multilib renodr/libudev-from-systemd s6-init trunk xry111/arm64 xry111/arm64-12.0 xry111/clfs-ng xry111/lfs-next xry111/loongarch xry111/loongarch-12.0 xry111/loongarch-12.1 xry111/mips64el xry111/pip3 xry111/rust-wip-20221008 xry111/update-glibc
Last change on this file since c91649c2 was 49e360b9, checked in by Bruce Dubbs <bdubbs@…>, 3 years ago

Add manual locales needed for tests if using alternate locale installation
instructions.

Minor changes to boot scripts.
  • Property mode set to 100644
File size: 34.5 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-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-fin-sbu;</seg>
37 <seg>&glibc-fin-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <para>Some of the Glibc programs use the non-FHS compliant
47 <filename class="directory">/var/db</filename> directory to store
48 their runtime data. Apply the following patch to make such programs
49 store their runtime data in the FHS-compliant locations:</para>
50
51<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
52
53 <para>Fix a bug that causes issues with chrooted applications:</para>
54
55 <screen><userinput remap="pre">sed -e '402a\ *result = local->data.services[database_index];' \
56 -i nss/nss_database.c</userinput></screen>
57
58 <para>The Glibc documentation recommends building Glibc
59 in a dedicated build directory:</para>
60
61<screen><userinput remap="pre">mkdir -v build
62cd build</userinput></screen>
63
64 <para>Prepare Glibc for compilation:</para>
65
66<screen><userinput remap="configure">../configure --prefix=/usr \
67 --disable-werror \
68 --enable-kernel=&min-kernel; \
69 --enable-stack-protector=strong \
70 --with-headers=/usr/include \
71 libc_cv_slibdir=/lib</userinput></screen>
72
73 <variablelist>
74 <title>The meaning of the configure options:</title>
75
76 <varlistentry>
77 <term><parameter>--disable-werror</parameter></term>
78 <listitem>
79 <para>This option disables the -Werror option passed to
80 GCC. This is necessary for running the test suite.</para>
81 </listitem>
82 </varlistentry>
83
84 <varlistentry>
85 <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
86 <listitem>
87 <para>This option tells the build system that this glibc may
88 be used with kernels as old as &min-kernel;. This means generating
89 workarounds in case a system call introduced in a later version
90 cannot be used.</para>
91 </listitem>
92 </varlistentry>
93
94 <varlistentry>
95 <term><parameter>--enable-stack-protector=strong</parameter></term>
96 <listitem>
97 <para>This option increases system security by adding
98 extra code to check for buffer overflows, such as stack
99 smashing attacks.</para>
100 </listitem>
101 </varlistentry>
102<!-- do we need this one? -->
103 <varlistentry>
104 <term><parameter>--with-headers=/usr/include</parameter></term>
105 <listitem>
106 <para>This option tells the build system where to find the
107 kernel API headers.</para>
108 </listitem>
109 </varlistentry>
110
111 <varlistentry>
112 <term><parameter>libc_cv_slibdir=/lib</parameter></term>
113 <listitem>
114 <para>This variable sets the correct library for all
115 systems. We do not want lib64 to be used.</para>
116 </listitem>
117 </varlistentry>
118
119 <varlistentry>
120 <term><option>libc_cv_include_x86_isa_level=no</option></term>
121 <listitem>
122 <para>This disables <quote>x86 ISA needed</quote> property in
123 Glibc libraries. Use it <emphasis role="bold">if</emphasis>
124 you are building Glibc with <option>-march</option> option in
125 <envar>CFLAGS</envar>, to workaround an issue in Glibc-2.33
126 breaking it.</para>
127 </listitem>
128 </varlistentry>
129
130 </variablelist>
131
132 <para>Compile the package:</para>
133
134<screen><userinput remap="make">make</userinput></screen>
135
136 <important>
137 <para>In this section, the test suite for Glibc is considered critical.
138 Do not skip it under any circumstance.</para>
139 </important>
140
141 <para>Generally a few tests do not pass. The test failures listed below
142 are usually safe to ignore.</para>
143
144<!-- Use remap="make" here to work around a jhalfs issue. -->
145<!--<screen><userinput remap="make">case $(uname -m) in
146 i?86) ln -sfnv $PWD/elf/ld-linux.so.2 /lib ;;
147 x86_64) ln -sfnv $PWD/elf/ld-linux-x86-64.so.2 /lib ;;
148esac</userinput></screen>
149
150 <note><para>The symbolic link above is needed to run the tests at this
151 stage of building in the chroot environment. It will be overwritten
152 in the install phase below.</para></note>
153-->
154<screen><userinput remap="test">make check</userinput></screen>
155
156 <para>You may see some test failures. The Glibc test suite is
157 somewhat dependent on the host system. This is a list of the most common
158 issues seen for some versions of LFS:</para>
159
160 <itemizedlist>
161
162 <listitem>
163 <para><emphasis>io/tst-lchmod</emphasis>
164 is known to fail in the LFS chroot environment.</para>
165 </listitem>
166
167 <listitem>
168 <para><emphasis>misc/tst-ttyname</emphasis>
169 is known to fail in the LFS chroot environment.</para>
170 </listitem>
171
172 <listitem>
173 <para><emphasis>elf/tst-cpu-features-cpuinfo</emphasis>
174 may fail on some architectures.</para>
175 </listitem>
176
177 <listitem>
178 <para>The <emphasis>nss/tst-nss-files-hosts-multi</emphasis>
179 test may fail for reasons that have not been determined.</para>
180 </listitem>
181
182 <listitem>
183 <para>The <emphasis>rt/tst-cputimer{1,2,3}</emphasis> tests depend on
184 the host system kernel. Kernels 4.14.91&ndash;4.14.96,
185 4.19.13&ndash;4.19.18, and 4.20.0&ndash;4.20.5 are known to
186 cause these tests to fail.
187 </para>
188 </listitem>
189
190 <listitem>
191 <para>The math tests sometimes fail when running on
192 systems where the CPU is not a relatively new Intel or
193 AMD processor.</para>
194 </listitem>
195
196 </itemizedlist>
197
198 <para>Though it is a harmless message, the install stage of Glibc will
199 complain about the absence of <filename>/etc/ld.so.conf</filename>.
200 Prevent this warning with:</para>
201
202<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
203
204 <para>Fix the generated Makefile to skip an unneeded sanity check
205 that fails in the LFS partial environment:
206 </para>
207
208<screen><userinput remap="install">sed '/test-installation/s@$(PERL)@echo not running@' -i ../Makefile</userinput></screen>
209
210 <para>Install the package:</para>
211
212<screen><userinput remap="install">make install</userinput></screen>
213
214 <para>Install the configuration file and runtime directory for
215 <command>nscd</command>:</para>
216
217<screen><userinput remap="install">cp -v ../nscd/nscd.conf /etc/nscd.conf
218mkdir -pv /var/cache/nscd</userinput></screen>
219
220 <para revision="systemd">Install the systemd support files for
221 <command>nscd</command>:</para>
222
223 <screen revision="systemd"><userinput remap="install">install -v -Dm644 ../nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
224install -v -Dm644 ../nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
225
226 <para>Next, install the locales that can make the system respond in a
227 different language. None of the locales are required, but if some of them
228 are missing, the test suites of future packages would skip important
229 testcases.</para>
230
231 <para>Individual locales can be installed using the
232 <command>localedef</command> program. E.g., the first
233 <command>localedef</command> command below combines the
234 <filename>/usr/share/i18n/locales/cs_CZ</filename>
235 charset-independent locale definition with the
236 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
237 charmap definition and appends the result to the
238 <filename>/usr/lib/locale/locale-archive</filename> file.
239 The following instructions will install the minimum set of
240 locales necessary for the optimal coverage of tests:</para>
241
242<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
243localedef -i POSIX -f UTF-8 C.UTF-8 2> /dev/null || true
244localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
245localedef -i de_DE -f ISO-8859-1 de_DE
246localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
247localedef -i de_DE -f UTF-8 de_DE.UTF-8
248localedef -i el_GR -f ISO-8859-7 el_GR
249localedef -i en_GB -f UTF-8 en_GB.UTF-8
250localedef -i en_HK -f ISO-8859-1 en_HK
251localedef -i en_PH -f ISO-8859-1 en_PH
252localedef -i en_US -f ISO-8859-1 en_US
253localedef -i en_US -f UTF-8 en_US.UTF-8
254localedef -i es_MX -f ISO-8859-1 es_MX
255localedef -i fa_IR -f UTF-8 fa_IR
256localedef -i fr_FR -f ISO-8859-1 fr_FR
257localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
258localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
259localedef -i it_IT -f ISO-8859-1 it_IT
260localedef -i it_IT -f UTF-8 it_IT.UTF-8
261localedef -i ja_JP -f EUC-JP ja_JP
262localedef -i ja_JP -f SHIFT_JIS ja_JP.SIJS 2> /dev/null || true
263localedef -i ja_JP -f UTF-8 ja_JP.UTF-8
264localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
265localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
266localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
267localedef -i zh_CN -f GB18030 zh_CN.GB18030
268localedef -i zh_HK -f BIG5-HKSCS zh_HK.BIG5-HKSCS</userinput></screen>
269
270 <para>In addition, install the locale for your own country, language and
271 character set.</para>
272
273 <para>Alternatively, install all locales listed in the
274 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
275 (it includes every locale listed above and many more) at once with the
276 following time-consuming command:</para>
277
278<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
279
280 <para>Then use the <command>localedef</command> command to create and
281 install locales not listed in the
282 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
283 when you need them. For instance, the following two locales are
284 needed for some tests later in this chapter:</para>
285
286<screen role="nodump"><userinput remap="locale-full">localedef -i POSIX -f UTF-8 C.UTF-8 2> /dev/null || true
287localedef -i ja_JP -f SHIFT_JIS ja_JP.SIJS 2> /dev/null || true</userinput></screen>
288
289 <note><para>Glibc now uses libidn2 when resolving internationalized
290 domain names. This is a run time dependency. If this capability
291 is needed, the instructions for installing libidn2 are in the
292 <ulink url="&blfs-book;general/libidn2.html">BLFS libidn2 page</ulink>.
293 </para></note>
294
295 </sect2>
296
297 <sect2 id="conf-glibc" role="configuration">
298 <title>Configuring Glibc</title>
299
300 <indexterm zone="conf-glibc">
301 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
302 </indexterm>
303
304 <indexterm zone="conf-glibc">
305 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
306 </indexterm>
307
308 <sect3>
309 <title>Adding nsswitch.conf</title>
310
311 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
312 because the Glibc defaults do not work well in a networked environment.
313 </para>
314
315 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
316 following:</para>
317
318<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
319<literal># Begin /etc/nsswitch.conf
320
321passwd: files
322group: files
323shadow: files
324
325hosts: files dns
326networks: files
327
328protocols: files
329services: files
330ethers: files
331rpc: files
332
333# End /etc/nsswitch.conf</literal>
334EOF</userinput></screen>
335
336 </sect3>
337
338 <sect3>
339 <title>Adding time zone data</title>
340
341 <para>Install and set up the time zone data with the following:</para>
342<screen><userinput>tar -xf ../../tzdata&tzdata-version;.tar.gz
343
344ZONEINFO=/usr/share/zoneinfo
345mkdir -pv $ZONEINFO/{posix,right}
346
347for tz in etcetera southamerica northamerica europe africa antarctica \
348 asia australasia backward; do
349 zic -L /dev/null -d $ZONEINFO ${tz}
350 zic -L /dev/null -d $ZONEINFO/posix ${tz}
351 zic -L leapseconds -d $ZONEINFO/right ${tz}
352done
353
354cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
355zic -d $ZONEINFO -p America/New_York
356unset ZONEINFO</userinput></screen>
357
358 <variablelist>
359 <title>The meaning of the zic commands:</title>
360
361 <varlistentry>
362 <term><parameter>zic -L /dev/null ...</parameter></term>
363 <listitem>
364 <para>This creates posix time zones without any leap seconds. It is
365 conventional to put these in both
366 <filename class="directory">zoneinfo</filename> and
367 <filename class="directory">zoneinfo/posix</filename>. It is
368 necessary to put the POSIX time zones in
369 <filename class="directory">zoneinfo</filename>, otherwise various
370 test-suites will report errors. On an embedded system, where space is
371 tight and you do not intend to ever update the time zones, you could save
372 1.9 MB by not using the <filename class="directory">posix</filename>
373 directory, but some applications or test-suites might produce some
374 failures.</para>
375 </listitem>
376 </varlistentry>
377 <varlistentry>
378 <term><parameter>zic -L leapseconds ...</parameter></term>
379 <listitem>
380 <para>This creates right time zones, including leap seconds. On an
381 embedded system, where space is tight and you do not intend to
382 ever update the time zones, or care about the correct time, you could
383 save 1.9MB by omitting the <filename class="directory">right</filename>
384 directory.</para>
385 </listitem>
386 </varlistentry>
387 <varlistentry>
388 <term><parameter>zic ... -p ...</parameter></term>
389 <listitem>
390 <para>This creates the <filename>posixrules</filename> file. We use
391 New York because POSIX requires the daylight savings time rules
392 to be in accordance with US rules.</para>
393 </listitem>
394 </varlistentry>
395 </variablelist>
396
397
398 <para>One way to determine the local time zone is to run the following
399 script:</para>
400
401<screen role="nodump"><userinput>tzselect</userinput></screen>
402
403 <para>After answering a few questions about the location, the script will
404 output the name of the time zone (e.g.,
405 <emphasis>America/Edmonton</emphasis>). There are also some other possible
406 time zones listed in <filename
407 class='directory'>/usr/share/zoneinfo</filename> such as
408 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
409 are not identified by the script but can be used.</para>
410
411 <para>Then create the <filename>/etc/localtime</filename> file by
412 running:</para>
413
414<screen><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
415
416 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
417 time zone selected (e.g., Canada/Eastern).</para>
418
419 </sect3>
420
421 <sect3 id="conf-ld" role="configuration">
422 <title>Configuring the Dynamic Loader</title>
423
424 <indexterm zone="conf-ld">
425 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
426 </indexterm>
427
428 <para>By default, the dynamic loader (<filename
429 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
430 <filename class="directory">/lib</filename> and <filename
431 class="directory">/usr/lib</filename> for dynamic libraries that are
432 needed by programs as they are run. However, if there are libraries in
433 directories other than <filename class="directory">/lib</filename> and
434 <filename class="directory">/usr/lib</filename>, these need to be added
435 to the <filename>/etc/ld.so.conf</filename> file in order for the
436 dynamic loader to find them. Two directories that are commonly known
437 to contain additional libraries are <filename
438 class="directory">/usr/local/lib</filename> and <filename
439 class="directory">/opt/lib</filename>, so add those directories to the
440 dynamic loader's search path.</para>
441
442 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
443 following:</para>
444
445<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
446<literal># Begin /etc/ld.so.conf
447/usr/local/lib
448/opt/lib
449</literal>
450EOF</userinput></screen>
451
452 <para>If desired, the dynamic loader can also search a directory and
453 include the contents of files found there. Generally the files in
454 this include directory are one line specifying the desired library path.
455 To add this capability run the following commands:</para>
456
457<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
458<literal># Add an include directory
459include /etc/ld.so.conf.d/*.conf
460</literal>
461EOF
462mkdir -pv /etc/ld.so.conf.d</userinput></screen>
463
464 </sect3>
465 </sect2>
466
467 <sect2 id="contents-glibc" role="content">
468 <title>Contents of Glibc</title>
469
470 <segmentedlist>
471 <segtitle>Installed programs</segtitle>
472 <segtitle>Installed libraries</segtitle>
473 <segtitle>Installed directories</segtitle>
474
475 <seglistitem>
476 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
477 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd,
478 pcprofiledump, pldd, sln, sotruss, sprof, tzselect, xtrace,
479 zdump, and zic</seg>
480 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
481 libc.{a,so}, libc_nonshared.a,
482 libcrypt.{a,so}, libdl.{a,so}, libg.a, libm.{a,so},
483 libmcheck.a, libmemusage.so, libmvec.{a,so}, libnsl.{a,so},
484 libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
485 libpcprofile.so, libpthread.{a,so},
486 libpthread_nonshared.a, libresolv.{a,so}, librt.{a,so},
487 libthread_db.so, and libutil.{a,so}</seg>
488 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
489 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
490 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
491 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
492 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
493 /usr/include/protocols, /usr/include/rpc,
494 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
495 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
496 /var/cache/nscd, and /var/lib/nss_db</seg>
497 </seglistitem>
498 </segmentedlist>
499
500 <variablelist>
501 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
502 <?dbfo list-presentation="list"?>
503 <?dbhtml list-presentation="table"?>
504
505 <varlistentry id="catchsegv">
506 <term><command>catchsegv</command></term>
507 <listitem>
508 <para>Can be used to create a stack trace when a program
509 terminates with a segmentation fault</para>
510 <indexterm zone="ch-system-glibc catchsegv">
511 <primary sortas="b-catchsegv">catchsegv</primary>
512 </indexterm>
513 </listitem>
514 </varlistentry>
515
516 <varlistentry id="gencat">
517 <term><command>gencat</command></term>
518 <listitem>
519 <para>Generates message catalogues</para>
520 <indexterm zone="ch-system-glibc gencat">
521 <primary sortas="b-gencat">gencat</primary>
522 </indexterm>
523 </listitem>
524 </varlistentry>
525
526 <varlistentry id="getconf">
527 <term><command>getconf</command></term>
528 <listitem>
529 <para>Displays the system configuration values for file system
530 specific variables</para>
531 <indexterm zone="ch-system-glibc getconf">
532 <primary sortas="b-getconf">getconf</primary>
533 </indexterm>
534 </listitem>
535 </varlistentry>
536
537 <varlistentry id="getent">
538 <term><command>getent</command></term>
539 <listitem>
540 <para>Gets entries from an administrative database</para>
541 <indexterm zone="ch-system-glibc getent">
542 <primary sortas="b-getent">getent</primary>
543 </indexterm>
544 </listitem>
545 </varlistentry>
546
547 <varlistentry id="iconv">
548 <term><command>iconv</command></term>
549 <listitem>
550 <para>Performs character set conversion</para>
551 <indexterm zone="ch-system-glibc iconv">
552 <primary sortas="b-iconv">iconv</primary>
553 </indexterm>
554 </listitem>
555 </varlistentry>
556
557 <varlistentry id="iconvconfig">
558 <term><command>iconvconfig</command></term>
559 <listitem>
560 <para>Creates fastloading <command>iconv</command> module configuration
561 files</para>
562 <indexterm zone="ch-system-glibc iconvconfig">
563 <primary sortas="b-iconvconfig">iconvconfig</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="ldconfig">
569 <term><command>ldconfig</command></term>
570 <listitem>
571 <para>Configures the dynamic linker runtime bindings</para>
572 <indexterm zone="ch-system-glibc ldconfig">
573 <primary sortas="b-ldconfig">ldconfig</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="ldd">
579 <term><command>ldd</command></term>
580 <listitem>
581 <para>Reports which shared libraries are required
582 by each given program or shared library</para>
583 <indexterm zone="ch-system-glibc ldd">
584 <primary sortas="b-ldd">ldd</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="lddlibc4">
590 <term><command>lddlibc4</command></term>
591 <listitem>
592 <para>Assists <command>ldd</command> with object files</para>
593 <indexterm zone="ch-system-glibc lddlibc4">
594 <primary sortas="b-lddlibc4">lddlibc4</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="locale">
600 <term><command>locale</command></term>
601 <listitem>
602 <para>Prints various information about the current locale</para>
603 <indexterm zone="ch-system-glibc locale">
604 <primary sortas="b-locale">locale</primary>
605 </indexterm>
606 </listitem>
607 </varlistentry>
608
609 <varlistentry id="localedef">
610 <term><command>localedef</command></term>
611 <listitem>
612 <para>Compiles locale specifications</para>
613 <indexterm zone="ch-system-glibc localedef">
614 <primary sortas="b-localedef">localedef</primary>
615 </indexterm>
616 </listitem>
617 </varlistentry>
618
619 <varlistentry id="makedb">
620 <term><command>makedb</command></term>
621 <listitem>
622 <para>Creates a simple database from textual input</para>
623 <indexterm zone="ch-system-glibc makedb">
624 <primary sortas="b-makedb">makedb</primary>
625 </indexterm>
626 </listitem>
627 </varlistentry>
628
629 <varlistentry id="mtrace">
630 <term><command>mtrace</command></term>
631 <listitem>
632 <para>Reads and interprets a memory trace file and displays a summary
633 in human-readable format</para>
634 <indexterm zone="ch-system-glibc mtrace">
635 <primary sortas="b-mtrace">mtrace</primary>
636 </indexterm>
637 </listitem>
638 </varlistentry>
639
640 <varlistentry id="nscd">
641 <term><command>nscd</command></term>
642 <listitem>
643 <para>A daemon that provides a cache for the most common name
644 service requests</para>
645 <indexterm zone="ch-system-glibc nscd">
646 <primary sortas="b-nscd">nscd</primary>
647 </indexterm>
648 </listitem>
649 </varlistentry>
650
651 <varlistentry id="pcprofiledump">
652 <term><command>pcprofiledump</command></term>
653 <listitem>
654 <para>Dump information generated by PC profiling</para>
655 <indexterm zone="ch-system-glibc pcprofiledump">
656 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
657 </indexterm>
658 </listitem>
659 </varlistentry>
660
661 <varlistentry id="pldd">
662 <term><command>pldd</command></term>
663 <listitem>
664 <para>Lists dynamic shared objects used by running processes</para>
665 <indexterm zone="ch-system-glibc pldd">
666 <primary sortas="b-pldd">pldd</primary>
667 </indexterm>
668 </listitem>
669 </varlistentry>
670
671 <varlistentry id="sln">
672 <term><command>sln</command></term>
673 <listitem>
674 <para>A statically linked <command>ln</command> program</para>
675 <indexterm zone="ch-system-glibc sln">
676 <primary sortas="b-sln">sln</primary>
677 </indexterm>
678 </listitem>
679 </varlistentry>
680
681 <varlistentry id="sotruss">
682 <term><command>sotruss</command></term>
683 <listitem>
684 <para>Traces shared library procedure calls of a specified command</para>
685 <indexterm zone="ch-system-glibc sotruss">
686 <primary sortas="b-sotruss">sotruss</primary>
687 </indexterm>
688 </listitem>
689 </varlistentry>
690
691 <varlistentry id="sprof">
692 <term><command>sprof</command></term>
693 <listitem>
694 <para>Reads and displays shared object profiling data</para>
695 <indexterm zone="ch-system-glibc sprof">
696 <primary sortas="b-sprof">sprof</primary>
697 </indexterm>
698 </listitem>
699 </varlistentry>
700
701 <varlistentry id="tzselect">
702 <term><command>tzselect</command></term>
703 <listitem>
704 <para>Asks the user about the location of the system and reports
705 the corresponding time zone description</para>
706 <indexterm zone="ch-system-glibc tzselect">
707 <primary sortas="b-tzselect">tzselect</primary>
708 </indexterm>
709 </listitem>
710 </varlistentry>
711
712 <varlistentry id="xtrace">
713 <term><command>xtrace</command></term>
714 <listitem>
715 <para>Traces the execution of a program by printing the currently
716 executed function</para>
717 <indexterm zone="ch-system-glibc xtrace">
718 <primary sortas="b-xtrace">xtrace</primary>
719 </indexterm>
720 </listitem>
721 </varlistentry>
722
723 <varlistentry id="zdump">
724 <term><command>zdump</command></term>
725 <listitem>
726 <para>The time zone dumper</para>
727 <indexterm zone="ch-system-glibc zdump">
728 <primary sortas="b-zdump">zdump</primary>
729 </indexterm>
730 </listitem>
731 </varlistentry>
732
733 <varlistentry id="zic">
734 <term><command>zic</command></term>
735 <listitem>
736 <para>The time zone compiler</para>
737 <indexterm zone="ch-system-glibc zic">
738 <primary sortas="b-zic">zic</primary>
739 </indexterm>
740 </listitem>
741 </varlistentry>
742
743 <varlistentry id="ld.so">
744 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
745 <listitem>
746 <para>The helper program for shared library executables</para>
747 <indexterm zone="ch-system-glibc ld.so">
748 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
749 </indexterm>
750 </listitem>
751 </varlistentry>
752
753 <varlistentry id="libBrokenLocale">
754 <term><filename class="libraryfile">libBrokenLocale</filename></term>
755 <listitem>
756 <para>Used internally by Glibc as a gross hack to get broken programs
757 (e.g., some Motif applications) running. See comments in
758 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
759 for more information</para>
760 <indexterm zone="ch-system-glibc libBrokenLocale">
761 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
762 </indexterm>
763 </listitem>
764 </varlistentry>
765
766 <varlistentry id="libSegFault">
767 <term><filename class="libraryfile">libSegFault</filename></term>
768 <listitem>
769 <para>The segmentation fault signal handler, used by
770 <command>catchsegv</command></para>
771 <indexterm zone="ch-system-glibc libSegFault">
772 <primary sortas="c-libSegFault">libSegFault</primary>
773 </indexterm>
774 </listitem>
775 </varlistentry>
776
777 <varlistentry id="libanl">
778 <term><filename class="libraryfile">libanl</filename></term>
779 <listitem>
780 <para>An asynchronous name lookup library</para>
781 <indexterm zone="ch-system-glibc libanl">
782 <primary sortas="c-libanl">libanl</primary>
783 </indexterm>
784 </listitem>
785 </varlistentry>
786
787 <varlistentry id="libc">
788 <term><filename class="libraryfile">libc</filename></term>
789 <listitem>
790 <para>The main C library</para>
791 <indexterm zone="ch-system-glibc libc">
792 <primary sortas="c-libc">libc</primary>
793 </indexterm>
794 </listitem>
795 </varlistentry>
796
797 <varlistentry id="libcrypt">
798 <term><filename class="libraryfile">libcrypt</filename></term>
799 <listitem>
800 <para>The cryptography library</para>
801 <indexterm zone="ch-system-glibc libcrypt">
802 <primary sortas="c-libcrypt">libcrypt</primary>
803 </indexterm>
804 </listitem>
805 </varlistentry>
806
807 <varlistentry id="libdl">
808 <term><filename class="libraryfile">libdl</filename></term>
809 <listitem>
810 <para>The dynamic linking interface library</para>
811 <indexterm zone="ch-system-glibc libdl">
812 <primary sortas="c-libdl">libdl</primary>
813 </indexterm>
814 </listitem>
815 </varlistentry>
816
817 <varlistentry id="libg">
818 <term><filename class="libraryfile">libg</filename></term>
819 <listitem>
820 <para>Dummy library containing no functions. Previously was a runtime
821 library for <command>g++</command></para>
822 <indexterm zone="ch-system-glibc libg">
823 <primary sortas="c-libg">libg</primary>
824 </indexterm>
825 </listitem>
826 </varlistentry>
827
828 <varlistentry id="libm">
829 <term><filename class="libraryfile">libm</filename></term>
830 <listitem>
831 <para>The mathematical library</para>
832 <indexterm zone="ch-system-glibc libm">
833 <primary sortas="c-libm">libm</primary>
834 </indexterm>
835 </listitem>
836 </varlistentry>
837
838 <varlistentry id="libmcheck">
839 <term><filename class="libraryfile">libmcheck</filename></term>
840 <listitem>
841 <para>Turns on memory allocation checking when linked to</para>
842 <indexterm zone="ch-system-glibc libmcheck">
843 <primary sortas="c-libmcheck">libmcheck</primary>
844 </indexterm>
845 </listitem>
846 </varlistentry>
847
848 <varlistentry id="libmemusage">
849 <term><filename class="libraryfile">libmemusage</filename></term>
850 <listitem>
851 <para>Used by <command>memusage</command> to help collect
852 information about the memory usage of a program</para>
853 <indexterm zone="ch-system-glibc libmemusage">
854 <primary sortas="c-libmemusage">libmemusage</primary>
855 </indexterm>
856 </listitem>
857 </varlistentry>
858
859 <varlistentry id="libnsl">
860 <term><filename class="libraryfile">libnsl</filename></term>
861 <listitem>
862 <para>The network services library</para>
863 <indexterm zone="ch-system-glibc libnsl">
864 <primary sortas="c-libnsl">libnsl</primary>
865 </indexterm>
866 </listitem>
867 </varlistentry>
868
869 <varlistentry id="libnss">
870 <term><filename class="libraryfile">libnss</filename></term>
871 <listitem>
872 <para>The Name Service Switch libraries, containing functions for
873 resolving host names, user names, group names, aliases, services,
874 protocols, etc.</para>
875 <indexterm zone="ch-system-glibc libnss">
876 <primary sortas="c-libnss">libnss</primary>
877 </indexterm>
878 </listitem>
879 </varlistentry>
880
881 <varlistentry id="libpcprofile">
882 <term><filename class="libraryfile">libpcprofile</filename></term>
883 <listitem>
884 <para>Can be preloaded to PC profile an executable</para>
885 <indexterm zone="ch-system-glibc libpcprofile">
886 <primary sortas="c-libpcprofile">libpcprofile</primary>
887 </indexterm>
888 </listitem>
889 </varlistentry>
890
891 <varlistentry id="libpthread">
892 <term><filename class="libraryfile">libpthread</filename></term>
893 <listitem>
894 <para>The POSIX threads library</para>
895 <indexterm zone="ch-system-glibc libpthread">
896 <primary sortas="c-libpthread">libpthread</primary>
897 </indexterm>
898 </listitem>
899 </varlistentry>
900
901 <varlistentry id="libresolv">
902 <term><filename class="libraryfile">libresolv</filename></term>
903 <listitem>
904 <para>Contains functions for creating, sending, and interpreting
905 packets to the Internet domain name servers</para>
906 <indexterm zone="ch-system-glibc libresolv">
907 <primary sortas="c-libresolv">libresolv</primary>
908 </indexterm>
909 </listitem>
910 </varlistentry>
911
912 <varlistentry id="librt">
913 <term><filename class="libraryfile">librt</filename></term>
914 <listitem>
915 <para>Contains functions providing most of the interfaces specified
916 by the POSIX.1b Realtime Extension</para>
917 <indexterm zone="ch-system-glibc librt">
918 <primary sortas="c-librt">librt</primary>
919 </indexterm>
920 </listitem>
921 </varlistentry>
922
923 <varlistentry id="libthread_db">
924 <term><filename class="libraryfile">libthread_db</filename></term>
925 <listitem>
926 <para>Contains functions useful for building debuggers for
927 multi-threaded programs</para>
928 <indexterm zone="ch-system-glibc libthread_db">
929 <primary sortas="c-libthread_db">libthread_db</primary>
930 </indexterm>
931 </listitem>
932 </varlistentry>
933
934 <varlistentry id="libutil">
935 <term><filename class="libraryfile">libutil</filename></term>
936 <listitem>
937 <para>Contains code for <quote>standard</quote> functions used in
938 many different Unix utilities</para>
939 <indexterm zone="ch-system-glibc libutil">
940 <primary sortas="c-libutil">libutil</primary>
941 </indexterm>
942 </listitem>
943 </varlistentry>
944
945 </variablelist>
946
947 </sect2>
948
949</sect1>
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