source: chapter06/glibc.xml@ c5eaf41

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Last change on this file since c5eaf41 was 3b03219, checked in by Bruce Dubbs <bdubbs@…>, 6 years ago

Update to dbus-1.12.10.
Add a note to glibc about using libidn2.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11447 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><para>The Glibc build system is self-contained and will install
47 perfectly, even though the compiler specs file and linker are still
48 pointing to <filename class="directory">/tools</filename>. The specs
49 and linker cannot be adjusted before the Glibc install because the
50 Glibc autoconf tests would give false results and defeat the goal
51 of achieving a clean build.</para></note>
52
53 <para>Some of the Glibc programs use the non-FHS compilant
54 <filename class="directory">/var/db</filename> directory to store
55 their runtime data. Apply the following patch to make such programs
56 store their runtime data in the FHS-compliant locations:</para>
57
58<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
59<!--
60 <para>Fix a minor security issue with glob functions:</para>
61
62<screen><userinput remap="pre">patch -Np1 -i ../&glibc-glob-patch;</userinput></screen>
63-->
64 <para>First create a compatibility symlink to avoid references to /tools in
65 our final glibc:</para>
66
67<screen><userinput remap="pre">ln -sfv /tools/lib/gcc /usr/lib</userinput></screen>
68
69 <para>Determine the GCC include directory and create a symlink for LSB
70 compliance. Additionally, for x86_64, create a compatibility symlink
71 required for the dynamic loader to function correctly:</para>
72
73<screen><userinput remap="pre">case $(uname -m) in
74 i?86) GCC_INCDIR=/usr/lib/gcc/$(uname -m)-pc-linux-gnu/&gcc-version;/include
75 ln -sfv ld-linux.so.2 /lib/ld-lsb.so.3
76 ;;
77 x86_64) GCC_INCDIR=/usr/lib/gcc/x86_64-pc-linux-gnu/&gcc-version;/include
78 ln -sfv ../lib/ld-linux-x86-64.so.2 /lib64
79 ln -sfv ../lib/ld-linux-x86-64.so.2 /lib64/ld-lsb-x86-64.so.3
80 ;;
81esac</userinput></screen>
82
83 <para>Remove a file that may be left over from a previous build attempt:
84 </para>
85
86<screen><userinput remap="pre">rm -f /usr/include/limits.h</userinput></screen>
87
88 <para>The Glibc documentation recommends building Glibc
89 in a dedicated build directory:</para>
90
91<screen><userinput remap="pre">mkdir -v build
92cd build</userinput></screen>
93
94 <para>Prepare Glibc for compilation:</para>
95
96<screen><userinput remap="configure">CC="gcc -isystem $GCC_INCDIR -isystem /usr/include" \
97../configure --prefix=/usr \
98 --disable-werror \
99 --enable-kernel=&min-kernel; \
100 --enable-stack-protector=strong \
101 libc_cv_slibdir=/lib
102unset GCC_INCDIR</userinput></screen>
103
104 <variablelist>
105 <title>The meaning of the options and new configure parameters:</title>
106
107 <varlistentry>
108 <term><parameter>CC="gcc -isystem $GCC_INCDIR -isystem /usr/include"</parameter></term>
109 <listitem>
110 <para>Setting the location of both gcc and system include directories
111 avoids introduction of invalid paths in debugging symbols.</para>
112 </listitem>
113 </varlistentry>
114
115 <varlistentry>
116 <term><parameter>--disable-werror</parameter></term>
117 <listitem>
118 <para>This option disables the -Werror option passed to
119 GCC. This is necessary for running the test suite.</para>
120 </listitem>
121 </varlistentry>
122
123 <varlistentry>
124 <term><parameter>--enable-stack-protector=strong</parameter></term>
125 <listitem>
126 <para>This option increases system security by adding
127 extra code to check for buffer overflows, such as stack
128 smashing attacks.</para>
129 </listitem>
130 </varlistentry>
131
132 <varlistentry>
133 <term><parameter>libc_cv_slibdir=/lib</parameter></term>
134 <listitem>
135 <para>This variable sets the correct library for all
136 systems. We do not want lib64 to be used.</para>
137 </listitem>
138 </varlistentry>
139
140 </variablelist>
141
142 <para>Compile the package:</para>
143
144<screen><userinput remap="make">make</userinput></screen>
145
146 <important>
147 <para>In this section, the test suite for Glibc is considered critical.
148 Do not skip it under any circumstance.</para>
149 </important>
150
151 <para>Generally a few tests do not pass. The test failures listed below
152 are usually safe to ignore.</para>
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>misc/tst-ttyname</emphasis>
164 is known to fail in the LFS chroot environment.</para>
165 </listitem>
166
167 <listitem>
168 <para><emphasis>inet/tst-idna_name_classify</emphasis>
169 is known to fail in the LFS chroot environment.</para>
170 </listitem>
171
172 <listitem>
173 <para><emphasis>posix/tst-getaddrinfo4</emphasis> and
174 <emphasis>posix/tst-getaddrinfo5</emphasis>
175 may fail on some architectures.</para>
176 </listitem>
177
178 <listitem>
179 <para>The <emphasis>nss/tst-nss-files-hosts-multi</emphasis>
180 test may fail for reasons that have not been determined.</para>
181 </listitem>
182
183<!--
184 <listitem>
185 <para>The <emphasis>rt/tst-cputimer1</emphasis> and
186 <emphasis>rt/tst-cpuclock2</emphasis> tests have been known to
187 fail. The reason is not completely understood, but indications are
188 that minor timing issues can trigger these failures.</para>
189 </listitem>
190-->
191 <listitem>
192 <para>The math tests sometimes fail when running on
193 systems where the CPU is not a relatively new Intel or
194 AMD processor.</para>
195 </listitem>
196<!--
197 <listitem>
198 <para>The
199 <emphasis>nptl/tst-thread-affinity-{pthread,pthread2,sched}</emphasis>
200 tests may fail for reasons that have not been determined. </para>
201 </listitem>
202
203 <listitem>
204 <para>Other tests known to fail on some architectures are
205 malloc/tst-malloc-usable and nptl/tst-cleanupx4. </para>
206 </listitem>
207-->
208 </itemizedlist>
209
210 <para>Though it is a harmless message, the install stage of Glibc will
211 complain about the absence of <filename>/etc/ld.so.conf</filename>.
212 Prevent this warning with:</para>
213
214<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
215
216 <para>Fix the generated Makefile to skip an unneeded sanity check
217 that fails in the LFS partial environment:
218 </para>
219
220<screen><userinput remap="install">sed '/test-installation/s@$(PERL)@echo not running@' -i ../Makefile</userinput></screen>
221
222 <para>Install the package:</para>
223
224<screen><userinput remap="install">make install</userinput></screen>
225
226 <para>Install the configuration file and runtime directory for
227 <command>nscd</command>:</para>
228
229<screen><userinput remap="install">cp -v ../nscd/nscd.conf /etc/nscd.conf
230mkdir -pv /var/cache/nscd</userinput></screen>
231
232 <para revision="systemd">Install the systemd support files for
233 <command>nscd</command>:</para>
234
235 <screen revision="systemd"><userinput remap="install">install -v -Dm644 ../nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
236install -v -Dm644 ../nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
237
238 <para>Next, install the locales that can make the system respond in a
239 different language. None of the locales are required, but if some of them
240 are missing, the test suites of future packages would skip important
241 testcases.</para>
242
243 <para>Individual locales can be installed using the
244 <command>localedef</command> program. E.g., the first
245 <command>localedef</command> command below combines the
246 <filename>/usr/share/i18n/locales/cs_CZ</filename>
247 charset-independent locale definition with the
248 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
249 charmap definition and appends the result to the
250 <filename>/usr/lib/locale/locale-archive</filename> file.
251 The following instructions will install the minimum set of
252 locales necessary for the optimal coverage of tests:</para>
253
254<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
255localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
256localedef -i de_DE -f ISO-8859-1 de_DE
257localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
258localedef -i de_DE -f UTF-8 de_DE.UTF-8
259localedef -i en_GB -f UTF-8 en_GB.UTF-8
260localedef -i en_HK -f ISO-8859-1 en_HK
261localedef -i en_PH -f ISO-8859-1 en_PH
262localedef -i en_US -f ISO-8859-1 en_US
263localedef -i en_US -f UTF-8 en_US.UTF-8
264localedef -i es_MX -f ISO-8859-1 es_MX
265localedef -i fa_IR -f UTF-8 fa_IR
266localedef -i fr_FR -f ISO-8859-1 fr_FR
267localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
268localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
269localedef -i it_IT -f ISO-8859-1 it_IT
270localedef -i it_IT -f UTF-8 it_IT.UTF-8
271localedef -i ja_JP -f EUC-JP ja_JP
272localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
273localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
274localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
275localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
276
277 <para>In addition, install the locale for your own country, language and
278 character set.</para>
279
280 <para>Alternatively, install all locales listed in the
281 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
282 (it includes every locale listed above and many more) at once with the
283 following time-consuming command:</para>
284
285<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
286
287 <para>Then use the <command>localedef</command> command to create and
288 install locales not listed in the
289 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
290 in the unlikely case you need them.</para>
291
292 <note><para>Glibc now uses libidn2 when resolving internationalized
293 domain names. This is a run time dependency. If this capability
294 is needed, the instrucions for installing libidn2 are in the
295 <ulink url="&blfs-book;general/libidn2.html">BLFS libidn2 page</ulink>.
296 </para></note>
297
298 </sect2>
299
300 <sect2 id="conf-glibc" role="configuration">
301 <title>Configuring Glibc</title>
302
303 <indexterm zone="conf-glibc">
304 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
305 </indexterm>
306
307 <indexterm zone="conf-glibc">
308 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
309 </indexterm>
310
311 <sect3>
312 <title>Adding nsswitch.conf</title>
313
314 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
315 because the Glibc defaults do not work well in a networked environment.
316 </para>
317
318 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
319 following:</para>
320
321<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
322<literal># Begin /etc/nsswitch.conf
323
324passwd: files
325group: files
326shadow: files
327
328hosts: files dns
329networks: files
330
331protocols: files
332services: files
333ethers: files
334rpc: files
335
336# End /etc/nsswitch.conf</literal>
337EOF</userinput></screen>
338
339 </sect3>
340
341 <sect3>
342 <title>Adding time zone data</title>
343
344 <para>Install and set up the time zone data with the following:</para>
345<screen><userinput>tar -xf ../../tzdata&tzdata-version;.tar.gz
346
347ZONEINFO=/usr/share/zoneinfo
348mkdir -pv $ZONEINFO/{posix,right}
349
350for tz in etcetera southamerica northamerica europe africa antarctica \
351 asia australasia backward pacificnew systemv; do
352 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
353 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
354 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
355done
356
357cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
358zic -d $ZONEINFO -p America/New_York
359unset ZONEINFO</userinput></screen>
360
361 <variablelist>
362 <title>The meaning of the zic commands:</title>
363
364 <varlistentry>
365 <term><parameter>zic -L /dev/null ...</parameter></term>
366 <listitem>
367 <para>This creates posix time zones, without any leap seconds. It is
368 conventional to put these in both
369 <filename class="directory">zoneinfo</filename> and
370 <filename class="directory">zoneinfo/posix</filename>. It is
371 necessary to put the POSIX time zones in
372 <filename class="directory">zoneinfo</filename>, otherwise various
373 test-suites will report errors. On an embedded system, where space is
374 tight and you do not intend to ever update the time zones, you could save
375 1.9MB by not using the <filename class="directory">posix</filename>
376 directory, but some applications or test-suites might produce some
377 failures.</para>
378 </listitem>
379 </varlistentry>
380 <varlistentry>
381 <term><parameter>zic -L leapseconds ...</parameter></term>
382 <listitem>
383 <para>This creates right time zones, including leap seconds. On an
384 embedded system, where space is tight and you do not intend to
385 ever update the time zones, or care about the correct time, you could
386 save 1.9MB by omitting the <filename class="directory">right</filename>
387 directory.</para>
388 </listitem>
389 </varlistentry>
390 <varlistentry>
391 <term><parameter>zic ... -p ...</parameter></term>
392 <listitem>
393 <para>This creates the <filename>posixrules</filename> file. We use
394 New York because POSIX requires the daylight savings time rules
395 to be in accordance with US rules.</para>
396 </listitem>
397 </varlistentry>
398 </variablelist>
399
400
401 <para>One way to determine the local time zone is to run the following
402 script:</para>
403
404<screen role="nodump"><userinput>tzselect</userinput></screen>
405
406 <para>After answering a few questions about the location, the script will
407 output the name of the time zone (e.g.,
408 <emphasis>America/Edmonton</emphasis>). There are also some other possible
409 time zones listed in <filename
410 class='directory'>/usr/share/zoneinfo</filename> such as
411 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
412 are not identified by the script but can be used.</para>
413
414 <para>Then create the <filename>/etc/localtime</filename> file by
415 running:</para>
416
417<screen revision="sysv"><userinput>cp -v /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
418
419<screen revision="systemd"><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
420
421 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
422 time zone selected (e.g., Canada/Eastern).</para>
423
424 </sect3>
425
426 <sect3 id="conf-ld" role="configuration">
427 <title>Configuring the Dynamic Loader</title>
428
429 <indexterm zone="conf-ld">
430 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
431 </indexterm>
432
433 <para>By default, the dynamic loader (<filename
434 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
435 <filename class="directory">/lib</filename> and <filename
436 class="directory">/usr/lib</filename> for dynamic libraries that are
437 needed by programs as they are run. However, if there are libraries in
438 directories other than <filename class="directory">/lib</filename> and
439 <filename class="directory">/usr/lib</filename>, these need to be added
440 to the <filename>/etc/ld.so.conf</filename> file in order for the
441 dynamic loader to find them. Two directories that are commonly known
442 to contain additional libraries are <filename
443 class="directory">/usr/local/lib</filename> and <filename
444 class="directory">/opt/lib</filename>, so add those directories to the
445 dynamic loader's search path.</para>
446
447 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
448 following:</para>
449
450<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
451<literal># Begin /etc/ld.so.conf
452/usr/local/lib
453/opt/lib
454</literal>
455EOF</userinput></screen>
456
457 <para>If desired, the dynamic loader can also search a directory and
458 include the contents of files found there. Generally the files in
459 this include directory are one line specifying the desired library path.
460 To add this capability run the following commands:</para>
461
462<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
463<literal># Add an include directory
464include /etc/ld.so.conf.d/*.conf
465</literal>
466EOF
467mkdir -pv /etc/ld.so.conf.d</userinput></screen>
468
469 </sect3>
470 </sect2>
471
472 <sect2 id="contents-glibc" role="content">
473 <title>Contents of Glibc</title>
474
475 <segmentedlist>
476 <segtitle>Installed programs</segtitle>
477 <segtitle>Installed libraries</segtitle>
478 <segtitle>Installed directories</segtitle>
479
480 <seglistitem>
481 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
482 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd,
483 pldd, sln, sotruss, sprof, tzselect, xtrace,
484 zdump, and zic</seg>
485 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
486 libc.{a,so}, libc_nonshared.a, libcidn.so,
487 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
488 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
489 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
490 libnss_nisplus.so, libpthread.{a,so},
491 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
492 libthread_db.so, and libutil.{a,so}</seg>
493 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
494 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
495 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
496 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
497 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
498 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
499 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
500 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
501 /var/cache/nscd, and /var/lib/nss_db</seg>
502 </seglistitem>
503 </segmentedlist>
504
505 <variablelist>
506 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
507 <?dbfo list-presentation="list"?>
508 <?dbhtml list-presentation="table"?>
509
510 <varlistentry id="catchsegv">
511 <term><command>catchsegv</command></term>
512 <listitem>
513 <para>Can be used to create a stack trace when a program
514 terminates with a segmentation fault</para>
515 <indexterm zone="ch-system-glibc catchsegv">
516 <primary sortas="b-catchsegv">catchsegv</primary>
517 </indexterm>
518 </listitem>
519 </varlistentry>
520
521 <varlistentry id="gencat">
522 <term><command>gencat</command></term>
523 <listitem>
524 <para>Generates message catalogues</para>
525 <indexterm zone="ch-system-glibc gencat">
526 <primary sortas="b-gencat">gencat</primary>
527 </indexterm>
528 </listitem>
529 </varlistentry>
530
531 <varlistentry id="getconf">
532 <term><command>getconf</command></term>
533 <listitem>
534 <para>Displays the system configuration values for file system
535 specific variables</para>
536 <indexterm zone="ch-system-glibc getconf">
537 <primary sortas="b-getconf">getconf</primary>
538 </indexterm>
539 </listitem>
540 </varlistentry>
541
542 <varlistentry id="getent">
543 <term><command>getent</command></term>
544 <listitem>
545 <para>Gets entries from an administrative database</para>
546 <indexterm zone="ch-system-glibc getent">
547 <primary sortas="b-getent">getent</primary>
548 </indexterm>
549 </listitem>
550 </varlistentry>
551
552 <varlistentry id="iconv">
553 <term><command>iconv</command></term>
554 <listitem>
555 <para>Performs character set conversion</para>
556 <indexterm zone="ch-system-glibc iconv">
557 <primary sortas="b-iconv">iconv</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="iconvconfig">
563 <term><command>iconvconfig</command></term>
564 <listitem>
565 <para>Creates fastloading <command>iconv</command> module configuration
566 files</para>
567 <indexterm zone="ch-system-glibc iconvconfig">
568 <primary sortas="b-iconvconfig">iconvconfig</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="ldconfig">
574 <term><command>ldconfig</command></term>
575 <listitem>
576 <para>Configures the dynamic linker runtime bindings</para>
577 <indexterm zone="ch-system-glibc ldconfig">
578 <primary sortas="b-ldconfig">ldconfig</primary>
579 </indexterm>
580 </listitem>
581 </varlistentry>
582
583 <varlistentry id="ldd">
584 <term><command>ldd</command></term>
585 <listitem>
586 <para>Reports which shared libraries are required
587 by each given program or shared library</para>
588 <indexterm zone="ch-system-glibc ldd">
589 <primary sortas="b-ldd">ldd</primary>
590 </indexterm>
591 </listitem>
592 </varlistentry>
593
594 <varlistentry id="lddlibc4">
595 <term><command>lddlibc4</command></term>
596 <listitem>
597 <para>Assists <command>ldd</command> with object files</para>
598 <indexterm zone="ch-system-glibc lddlibc4">
599 <primary sortas="b-lddlibc4">lddlibc4</primary>
600 </indexterm>
601 </listitem>
602 </varlistentry>
603
604 <varlistentry id="locale">
605 <term><command>locale</command></term>
606 <listitem>
607 <para>Prints various information about the current locale</para>
608 <indexterm zone="ch-system-glibc locale">
609 <primary sortas="b-locale">locale</primary>
610 </indexterm>
611 </listitem>
612 </varlistentry>
613
614 <varlistentry id="localedef">
615 <term><command>localedef</command></term>
616 <listitem>
617 <para>Compiles locale specifications</para>
618 <indexterm zone="ch-system-glibc localedef">
619 <primary sortas="b-localedef">localedef</primary>
620 </indexterm>
621 </listitem>
622 </varlistentry>
623
624 <varlistentry id="makedb">
625 <term><command>makedb</command></term>
626 <listitem>
627 <para>Creates a simple database from textual input</para>
628 <indexterm zone="ch-system-glibc makedb">
629 <primary sortas="b-makedb">makedb</primary>
630 </indexterm>
631 </listitem>
632 </varlistentry>
633
634 <varlistentry id="mtrace">
635 <term><command>mtrace</command></term>
636 <listitem>
637 <para>Reads and interprets a memory trace file and displays a summary
638 in human-readable format</para>
639 <indexterm zone="ch-system-glibc mtrace">
640 <primary sortas="b-mtrace">mtrace</primary>
641 </indexterm>
642 </listitem>
643 </varlistentry>
644
645 <varlistentry id="nscd">
646 <term><command>nscd</command></term>
647 <listitem>
648 <para>A daemon that provides a cache for the most common name
649 service requests</para>
650 <indexterm zone="ch-system-glibc nscd">
651 <primary sortas="b-nscd">nscd</primary>
652 </indexterm>
653 </listitem>
654 </varlistentry>
655
656 <varlistentry id="pldd">
657 <term><command>pldd</command></term>
658 <listitem>
659 <para>Lists dynamic shared objects used by running processes</para>
660 <indexterm zone="ch-system-glibc pldd">
661 <primary sortas="b-pldd">pldd</primary>
662 </indexterm>
663 </listitem>
664 </varlistentry>
665
666 <varlistentry id="sln">
667 <term><command>sln</command></term>
668 <listitem>
669 <para>A statically linked <command>ln</command> program</para>
670 <indexterm zone="ch-system-glibc sln">
671 <primary sortas="b-sln">sln</primary>
672 </indexterm>
673 </listitem>
674 </varlistentry>
675
676 <varlistentry id="sotruss">
677 <term><command>sotruss</command></term>
678 <listitem>
679 <para>Traces shared library procedure calls of a specified command</para>
680 <indexterm zone="ch-system-glibc sotruss">
681 <primary sortas="b-sotruss">sotruss</primary>
682 </indexterm>
683 </listitem>
684 </varlistentry>
685
686 <varlistentry id="sprof">
687 <term><command>sprof</command></term>
688 <listitem>
689 <para>Reads and displays shared object profiling data</para>
690 <indexterm zone="ch-system-glibc sprof">
691 <primary sortas="b-sprof">sprof</primary>
692 </indexterm>
693 </listitem>
694 </varlistentry>
695
696 <varlistentry id="tzselect">
697 <term><command>tzselect</command></term>
698 <listitem>
699 <para>Asks the user about the location of the system and reports
700 the corresponding time zone description</para>
701 <indexterm zone="ch-system-glibc tzselect">
702 <primary sortas="b-tzselect">tzselect</primary>
703 </indexterm>
704 </listitem>
705 </varlistentry>
706
707 <varlistentry id="xtrace">
708 <term><command>xtrace</command></term>
709 <listitem>
710 <para>Traces the execution of a program by printing the currently
711 executed function</para>
712 <indexterm zone="ch-system-glibc xtrace">
713 <primary sortas="b-xtrace">xtrace</primary>
714 </indexterm>
715 </listitem>
716 </varlistentry>
717
718 <varlistentry id="zdump">
719 <term><command>zdump</command></term>
720 <listitem>
721 <para>The time zone dumper</para>
722 <indexterm zone="ch-system-glibc zdump">
723 <primary sortas="b-zdump">zdump</primary>
724 </indexterm>
725 </listitem>
726 </varlistentry>
727
728 <varlistentry id="zic">
729 <term><command>zic</command></term>
730 <listitem>
731 <para>The time zone compiler</para>
732 <indexterm zone="ch-system-glibc zic">
733 <primary sortas="b-zic">zic</primary>
734 </indexterm>
735 </listitem>
736 </varlistentry>
737
738 <varlistentry id="ld.so">
739 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
740 <listitem>
741 <para>The helper program for shared library executables</para>
742 <indexterm zone="ch-system-glibc ld.so">
743 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
744 </indexterm>
745 </listitem>
746 </varlistentry>
747
748 <varlistentry id="libBrokenLocale">
749 <term><filename class="libraryfile">libBrokenLocale</filename></term>
750 <listitem>
751 <para>Used internally by Glibc as a gross hack to get broken programs
752 (e.g., some Motif applications) running. See comments in
753 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
754 for more information</para>
755 <indexterm zone="ch-system-glibc libBrokenLocale">
756 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
757 </indexterm>
758 </listitem>
759 </varlistentry>
760
761 <varlistentry id="libSegFault">
762 <term><filename class="libraryfile">libSegFault</filename></term>
763 <listitem>
764 <para>The segmentation fault signal handler, used by
765 <command>catchsegv</command></para>
766 <indexterm zone="ch-system-glibc libSegFault">
767 <primary sortas="c-libSegFault">libSegFault</primary>
768 </indexterm>
769 </listitem>
770 </varlistentry>
771
772 <varlistentry id="libanl">
773 <term><filename class="libraryfile">libanl</filename></term>
774 <listitem>
775 <para>An asynchronous name lookup library</para>
776 <indexterm zone="ch-system-glibc libanl">
777 <primary sortas="c-libanl">libanl</primary>
778 </indexterm>
779 </listitem>
780 </varlistentry>
781
782 <varlistentry id="libc">
783 <term><filename class="libraryfile">libc</filename></term>
784 <listitem>
785 <para>The main C library</para>
786 <indexterm zone="ch-system-glibc libc">
787 <primary sortas="c-libc">libc</primary>
788 </indexterm>
789 </listitem>
790 </varlistentry>
791
792 <varlistentry id="libcidn">
793 <term><filename class="libraryfile">libcidn</filename></term>
794 <listitem>
795 <para>Used internally by Glibc for handling internationalized domain
796 names in the <function>getaddrinfo()</function> function</para>
797 <indexterm zone="ch-system-glibc libcidn">
798 <primary sortas="c-libcidn">libcidn</primary>
799 </indexterm>
800 </listitem>
801 </varlistentry>
802
803 <varlistentry id="libcrypt">
804 <term><filename class="libraryfile">libcrypt</filename></term>
805 <listitem>
806 <para>The cryptography library</para>
807 <indexterm zone="ch-system-glibc libcrypt">
808 <primary sortas="c-libcrypt">libcrypt</primary>
809 </indexterm>
810 </listitem>
811 </varlistentry>
812
813 <varlistentry id="libdl">
814 <term><filename class="libraryfile">libdl</filename></term>
815 <listitem>
816 <para>The dynamic linking interface library</para>
817 <indexterm zone="ch-system-glibc libdl">
818 <primary sortas="c-libdl">libdl</primary>
819 </indexterm>
820 </listitem>
821 </varlistentry>
822
823 <varlistentry id="libg">
824 <term><filename class="libraryfile">libg</filename></term>
825 <listitem>
826 <para>Dummy library containing no functions. Previously was a runtime
827 library for <command>g++</command></para>
828 <indexterm zone="ch-system-glibc libg">
829 <primary sortas="c-libg">libg</primary>
830 </indexterm>
831 </listitem>
832 </varlistentry>
833
834 <varlistentry id="libieee">
835 <term><filename class="libraryfile">libieee</filename></term>
836 <listitem>
837 <para>Linking in this module forces error handling rules for math
838 functions as defined by the Institute of Electrical and Electronic
839 Engineers (IEEE). The default is POSIX.1 error handling</para>
840 <indexterm zone="ch-system-glibc libieee">
841 <primary sortas="c-libieee">libieee</primary>
842 </indexterm>
843 </listitem>
844 </varlistentry>
845
846 <varlistentry id="libm">
847 <term><filename class="libraryfile">libm</filename></term>
848 <listitem>
849 <para>The mathematical library</para>
850 <indexterm zone="ch-system-glibc libm">
851 <primary sortas="c-libm">libm</primary>
852 </indexterm>
853 </listitem>
854 </varlistentry>
855
856 <varlistentry id="libmcheck">
857 <term><filename class="libraryfile">libmcheck</filename></term>
858 <listitem>
859 <para>Turns on memory allocation checking when linked to</para>
860 <indexterm zone="ch-system-glibc libmcheck">
861 <primary sortas="c-libmcheck">libmcheck</primary>
862 </indexterm>
863 </listitem>
864 </varlistentry>
865
866 <varlistentry id="libmemusage">
867 <term><filename class="libraryfile">libmemusage</filename></term>
868 <listitem>
869 <para>Used by <command>memusage</command> to help collect
870 information about the memory usage of a program</para>
871 <indexterm zone="ch-system-glibc libmemusage">
872 <primary sortas="c-libmemusage">libmemusage</primary>
873 </indexterm>
874 </listitem>
875 </varlistentry>
876
877 <varlistentry id="libnsl">
878 <term><filename class="libraryfile">libnsl</filename></term>
879 <listitem>
880 <para>The network services library</para>
881 <indexterm zone="ch-system-glibc libnsl">
882 <primary sortas="c-libnsl">libnsl</primary>
883 </indexterm>
884 </listitem>
885 </varlistentry>
886
887 <varlistentry id="libnss">
888 <term><filename class="libraryfile">libnss</filename></term>
889 <listitem>
890 <para>The Name Service Switch libraries, containing functions for
891 resolving host names, user names, group names, aliases, services,
892 protocols, etc.</para>
893 <indexterm zone="ch-system-glibc libnss">
894 <primary sortas="c-libnss">libnss</primary>
895 </indexterm>
896 </listitem>
897 </varlistentry>
898
899 <varlistentry id="libpthread">
900 <term><filename class="libraryfile">libpthread</filename></term>
901 <listitem>
902 <para>The POSIX threads library</para>
903 <indexterm zone="ch-system-glibc libpthread">
904 <primary sortas="c-libpthread">libpthread</primary>
905 </indexterm>
906 </listitem>
907 </varlistentry>
908
909 <varlistentry id="libresolv">
910 <term><filename class="libraryfile">libresolv</filename></term>
911 <listitem>
912 <para>Contains functions for creating, sending, and interpreting
913 packets to the Internet domain name servers</para>
914 <indexterm zone="ch-system-glibc libresolv">
915 <primary sortas="c-libresolv">libresolv</primary>
916 </indexterm>
917 </listitem>
918 </varlistentry>
919
920 <varlistentry id="librpcsvc">
921 <term><filename class="libraryfile">librpcsvc</filename></term>
922 <listitem>
923 <para>Contains functions providing miscellaneous RPC services</para>
924 <indexterm zone="ch-system-glibc librpcsvc">
925 <primary sortas="c-librpcsvc">librpcsvc</primary>
926 </indexterm>
927 </listitem>
928 </varlistentry>
929
930 <varlistentry id="librt">
931 <term><filename class="libraryfile">librt</filename></term>
932 <listitem>
933 <para>Contains functions providing most of the interfaces specified
934 by the POSIX.1b Realtime Extension</para>
935 <indexterm zone="ch-system-glibc librt">
936 <primary sortas="c-librt">librt</primary>
937 </indexterm>
938 </listitem>
939 </varlistentry>
940
941 <varlistentry id="libthread_db">
942 <term><filename class="libraryfile">libthread_db</filename></term>
943 <listitem>
944 <para>Contains functions useful for building debuggers for
945 multi-threaded programs</para>
946 <indexterm zone="ch-system-glibc libthread_db">
947 <primary sortas="c-libthread_db">libthread_db</primary>
948 </indexterm>
949 </listitem>
950 </varlistentry>
951
952 <varlistentry id="libutil">
953 <term><filename class="libraryfile">libutil</filename></term>
954 <listitem>
955 <para>Contains code for <quote>standard</quote> functions used in
956 many different Unix utilities</para>
957 <indexterm zone="ch-system-glibc libutil">
958 <primary sortas="c-libutil">libutil</primary>
959 </indexterm>
960 </listitem>
961 </varlistentry>
962
963 </variablelist>
964
965 </sect2>
966
967</sect1>
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