source: chapter06/glibc.xml@ 1e77f0c

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Last change on this file since 1e77f0c was 1e77f0c, checked in by DJ Lucas <dj@…>, 16 years ago

Updated list of minimum locales.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8691 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>The glibc-libidn tarball adds support for internationalized domain
65 names (IDN) to Glibc. Many programs that support IDN require the full
66 <filename class="libraryfile">libidn</filename> library, not this add-on (see
67 <ulink url="&blfs-root;view/svn/general/libidn.html"/>).
68 Unpack the tarball from within the Glibc source directory:</para>
69
70<screen><userinput remap="pre">tar -xvf ../glibc-libidn-&glibc-version;.tar.bz2
71mv glibc-libidn-&glibc-version; libidn</userinput></screen>-->
72
73 <para>In the vi_VN.TCVN locale, <command>bash</command> enters an infinite
74 loop at startup. It is unknown whether this is a <command>bash</command>
75 bug or a Glibc problem. Disable installation of this locale in order to
76 avoid the problem:</para>
77
78<screen><userinput remap="pre">sed -i '/vi_VN.TCVN/d' localedata/SUPPORTED</userinput></screen>
79
80 <!-- <para>When running <command>make install</command>, a script called
81 <filename>test-installation.pl</filename> performs a small sanity test on
82 our newly installed Glibc. However, because our toolchain still points to
83 the <filename class="directory">/tools</filename> directory, the sanity
84 test would be carried out against the wrong Glibc. We can force the script
85 to check the Glibc we have just installed with the following:</para>
86
87<screen><userinput remap="pre">sed -i \
88's|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=/lib/ld-linux.so.2 -o|' \
89 scripts/test-installation.pl</userinput></screen> -->
90
91 <para>First apply two patches which correct failures in the test
92 suite:</para>
93
94<screen><userinput remap="pre">patch -Np1 -i ../&glibc-iconv-test-fixes-patch;
95patch -Np1 -i ../&glibc-ildoubl-test-fix-patch;</userinput></screen>
96
97
98 <para>The <command>ldd</command> shell script contains Bash-specific
99 syntax. Change its default program interpreter to <command>/bin/bash</command>
100 in case another <command>/bin/sh</command> is installed as described in the
101 <ulink url="&blfs-root;view/svn/postlfs/shells.html">Shells</ulink>
102 chapter of the BLFS book:</para>
103
104<screen><userinput remap="pre">sed -i 's|@BASH@|/bin/bash|' elf/ldd.bash.in</userinput></screen>
105
106 <para>The Glibc documentation recommends building Glibc outside of the source
107 directory in a dedicated build directory:</para>
108
109<screen><userinput remap="pre">mkdir -v ../glibc-build
110cd ../glibc-build</userinput></screen>
111
112 <para>Again, add the needed compiler flag to CFLAGS:</para>
113
114<screen><userinput remap="configure">echo "CFLAGS += -march=i486 -mtune=native" &gt; configparms</userinput></screen>
115
116 <para>Prepare Glibc for compilation:</para>
117
118<screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/usr \
119 --disable-profile --enable-add-ons \
120 --enable-kernel=2.6.0 --libexecdir=/usr/lib/glibc</userinput></screen>
121
122 <variablelist>
123 <title>The meaning of the new configure options:</title>
124
125 <varlistentry>
126 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
127 <listitem>
128 <para>This changes the location of the <command>pt_chown</command>
129 program from its default of <filename
130 class="directory">/usr/libexec</filename> to <filename
131 class="directory">/usr/lib/glibc</filename>.</para>
132 </listitem>
133 </varlistentry>
134
135 </variablelist>
136
137 <para>Compile the package:</para>
138
139<screen><userinput remap="make">make</userinput></screen>
140
141 <important>
142 <para>In this section, the test suite for Glibc is considered critical.
143 Do not skip it under any circumstance.</para>
144 </important>
145
146 <para>Before running the tests, copy a file from the source tree into our
147 build tree to prevent a couple of test failures, then test the
148 results:</para>
149
150<screen><userinput remap="test">cp -v ../glibc-&glibc-version;/iconvdata/gconv-modules iconvdata
151make -k check 2&gt;&amp;1 | tee glibc-check-log
152grep Error glibc-check-log</userinput></screen>
153
154 <para>You will probably see an expected (ignored) failure in the
155 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
156 is somewhat dependent on the host system. This is a list of the most
157 common issues:</para>
158
159 <itemizedlist>
160 <!-- Check again after updating from gcc-4.1.x -->
161 <listitem>
162 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
163 using the 4.1 series of GCC.</para>
164 </listitem>
165 <!-- Was true in glibc-2.3.6 -->
166 <listitem>
167 <para>The <emphasis>nptl/tst-clock2</emphasis> and
168 <emphasis>tst-attr3</emphasis> tests sometimes
169 fail. The reason is not completely understood, but indications
170 are that a heavy system load can trigger these failures.</para>
171 </listitem>
172 <listitem>
173 <para>The math tests sometimes fail when running on
174 systems where the CPU is not a relatively new genuine Intel or
175 authentic AMD processor.</para>
176 </listitem>
177 <listitem>
178 <para>If you have mounted the LFS partition with the
179 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
180 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
181 use the <parameter>noatime</parameter> option while building LFS.</para>
182 </listitem>
183 <listitem>
184 <para>When running on older and slower hardware or on systems under
185 load, some tests can fail because of test timeouts being exceeded.</para>
186 </listitem>
187 </itemizedlist>
188
189 <para>Though it is a harmless message, the install stage of Glibc will
190 complain about the absence of <filename>/etc/ld.so.conf</filename>.
191 Prevent this warning with:</para>
192
193<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
194
195 <para>Install the package:</para>
196
197<screen><userinput remap="install">make install</userinput></screen>
198
199 <para>The locales that can make the system respond in a different language
200 were not installed by the above command. None of the locales are required,
201 but if some of them are missing, testsuites of the future packages would
202 skip important testcases.</para>
203
204 <para>Individual locales can be installed using the
205 <command>localedef</command> program. E.g., the first
206 <command>localedef</command> command below combines the
207 <filename>/usr/share/i18n/locales/de_DE</filename>
208 charset-independent locale definition with the
209 <filename>/usr/share/i18n/charmaps/ISO-8859-1.gz</filename>
210 charmap definition and appends the result to the
211 <filename>/usr/lib/locale/locale-archive</filename> file.
212 The following instructions will install the minimum set of
213 locales necessary for the optimal coverage of tests:</para>
214
215<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
216localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
217localedef -i de_DE -f ISO-8859-1 de_DE
218localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
219localedef -i de_DE -f UTF-8 de_DE.UTF-8
220localedef -i en_HK -f ISO-8859-1 en_HK
221localedef -i en_PH -f ISO-8859-1 en_PH
222localedef -i en_US -f ISO-8859-1 en_US
223localedef -i en_US -f UTF-8 en_US.UTF-8
224localedef -i es_MX -f ISO-8859-1 es_MX
225localedef -i fa_IR -f UTF-8 fa_IR
226localedef -i fr_FR -f ISO-8859-1 fr_FR
227localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
228localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
229localedef -i it_IT -f ISO-8859-1 it_IT
230localedef -i ja_JP -f EUC-JP ja_JP
231localedef -i tr_TR -f UTF-8 tr_TR.UTF-8</userinput></screen>
232
233 <para>In addition, install the locale for your own country, language and
234 character set.</para>
235
236 <para>Alternatively, install all locales listed in the
237 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
238 (it includes every locale listed above and many more) at once with the
239 following time-consuming command:</para>
240
241<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
242
243 <para>Then use the <command>localedef</command> command to create and
244 install locales not listed in the
245 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
246 in the unlikely case you need them.</para>
247 <!-- The Live CD patches the localedata/SUPPORTED file instead of
248 running localedef, the results are equivalent -->
249
250 </sect2>
251
252 <sect2 id="conf-glibc" role="configuration">
253 <title>Configuring Glibc</title>
254
255 <indexterm zone="conf-glibc">
256 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
257 </indexterm>
258
259 <indexterm zone="conf-glibc">
260 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
261 </indexterm>
262
263 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
264 because, although Glibc provides defaults when this file is missing or corrupt,
265 the Glibc defaults do not work well in a networked environment. The time zone
266 also needs to be configured.</para>
267
268 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
269 following:</para>
270
271<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
272<literal># Begin /etc/nsswitch.conf
273
274passwd: files
275group: files
276shadow: files
277
278hosts: files dns
279networks: files
280
281protocols: files
282services: files
283ethers: files
284rpc: files
285
286# End /etc/nsswitch.conf</literal>
287EOF</userinput></screen>
288
289 <para>One way to determine the local time zone, run the following
290 script:</para>
291
292<screen role="nodump"><userinput>tzselect</userinput></screen>
293
294 <para>After answering a few questions about the location, the script will
295 output the name of the time zone (e.g.,
296 <emphasis>America/Edmonton</emphasis>). There are also some other possible
297 timezones listed in <filename
298 class='directory'>/usr/share/zoneinfo</filename> such as
299 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
300 are not identified by the script but can be used.</para>
301
302 <para>Then create the <filename>/etc/localtime</filename> file by
303 running:</para>
304
305<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
306 /etc/localtime</userinput></screen>
307
308 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
309 time zone selected (e.g., Canada/Eastern).</para>
310
311 <variablelist>
312 <title>The meaning of the cp option:</title>
313
314 <varlistentry>
315 <term><parameter>--remove-destination</parameter></term>
316 <listitem>
317 <para>This is needed to force removal of the already existing symbolic
318 link. The reason for copying the file instead of using a symlink is to
319 cover the situation where <filename class="directory">/usr</filename>
320 is on a separate partition. This could be important when booted into
321 single user mode.</para>
322 </listitem>
323 </varlistentry>
324
325 </variablelist>
326
327 </sect2>
328
329 <sect2 id="conf-ld" role="configuration">
330 <title>Configuring the Dynamic Loader</title>
331
332 <indexterm zone="conf-ld">
333 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
334 </indexterm>
335
336 <para>By default, the dynamic loader (<filename
337 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
338 <filename class="directory">/lib</filename> and <filename
339 class="directory">/usr/lib</filename> for dynamic libraries that are
340 needed by programs as they are run. However, if there are libraries in
341 directories other than <filename class="directory">/lib</filename> and
342 <filename class="directory">/usr/lib</filename>, these need to be added
343 to the <filename>/etc/ld.so.conf</filename> file in order for the
344 dynamic loader to find them. Two directories that are commonly known
345 to contain additional libraries are <filename
346 class="directory">/usr/local/lib</filename> and <filename
347 class="directory">/opt/lib</filename>, so add those directories to the
348 dynamic loader's search path.</para>
349
350 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
351 following:</para>
352
353<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
354<literal># Begin /etc/ld.so.conf
355
356/usr/local/lib
357/opt/lib
358
359# End /etc/ld.so.conf</literal>
360EOF</userinput></screen>
361
362 </sect2>
363
364 <sect2 id="contents-glibc" role="content">
365 <title>Contents of Glibc</title>
366
367 <segmentedlist>
368 <segtitle>Installed programs</segtitle>
369 <segtitle>Installed libraries</segtitle>
370
371 <seglistitem>
372 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
373 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
374 pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
375 zdump, and zic</seg>
376 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
377 libbsd-compat.a, libc.{a,so}, libcidn.so, libcrypt.{a,so}, libdl.{a,so},
378 libg.a, libieee.a, libm.{a,so}, libmcheck.a, libmemusage.so,
379 libnsl.{a,so}, libnss_compat.so, libnss_dns.so, libnss_files.so,
380 libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so, libpcprofile.so,
381 libpthread.{a,so}, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
382 libthread_db.so, and libutil.{a,so}</seg>
383 </seglistitem>
384 </segmentedlist>
385
386 <variablelist>
387 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
388 <?dbfo list-presentation="list"?>
389 <?dbhtml list-presentation="table"?>
390
391 <varlistentry id="catchsegv">
392 <term><command>catchsegv</command></term>
393 <listitem>
394 <para>Can be used to create a stack trace when a program
395 terminates with a segmentation fault</para>
396 <indexterm zone="ch-system-glibc catchsegv">
397 <primary sortas="b-catchsegv">catchsegv</primary>
398 </indexterm>
399 </listitem>
400 </varlistentry>
401
402 <varlistentry id="gencat">
403 <term><command>gencat</command></term>
404 <listitem>
405 <para>Generates message catalogues</para>
406 <indexterm zone="ch-system-glibc gencat">
407 <primary sortas="b-gencat">gencat</primary>
408 </indexterm>
409 </listitem>
410 </varlistentry>
411
412 <varlistentry id="getconf">
413 <term><command>getconf</command></term>
414 <listitem>
415 <para>Displays the system configuration values for file system
416 specific variables</para>
417 <indexterm zone="ch-system-glibc getconf">
418 <primary sortas="b-getconf">getconf</primary>
419 </indexterm>
420 </listitem>
421 </varlistentry>
422
423 <varlistentry id="getent">
424 <term><command>getent</command></term>
425 <listitem>
426 <para>Gets entries from an administrative database</para>
427 <indexterm zone="ch-system-glibc getent">
428 <primary sortas="b-getent">getent</primary>
429 </indexterm>
430 </listitem>
431 </varlistentry>
432
433 <varlistentry id="iconv">
434 <term><command>iconv</command></term>
435 <listitem>
436 <para>Performs character set conversion</para>
437 <indexterm zone="ch-system-glibc iconv">
438 <primary sortas="b-iconv">iconv</primary>
439 </indexterm>
440 </listitem>
441 </varlistentry>
442
443 <varlistentry id="iconvconfig">
444 <term><command>iconvconfig</command></term>
445 <listitem>
446 <para>Creates fastloading <command>iconv</command> module configuration
447 files</para>
448 <indexterm zone="ch-system-glibc iconvconfig">
449 <primary sortas="b-iconvconfig">iconvconfig</primary>
450 </indexterm>
451 </listitem>
452 </varlistentry>
453
454 <varlistentry id="ldconfig">
455 <term><command>ldconfig</command></term>
456 <listitem>
457 <para>Configures the dynamic linker runtime bindings</para>
458 <indexterm zone="ch-system-glibc ldconfig">
459 <primary sortas="b-ldconfig">ldconfig</primary>
460 </indexterm>
461 </listitem>
462 </varlistentry>
463
464 <varlistentry id="ldd">
465 <term><command>ldd</command></term>
466 <listitem>
467 <para>Reports which shared libraries are required
468 by each given program or shared library</para>
469 <indexterm zone="ch-system-glibc ldd">
470 <primary sortas="b-ldd">ldd</primary>
471 </indexterm>
472 </listitem>
473 </varlistentry>
474
475 <varlistentry id="lddlibc4">
476 <term><command>lddlibc4</command></term>
477 <listitem>
478 <para>Assists <command>ldd</command> with object files</para>
479 <indexterm zone="ch-system-glibc lddlibc4">
480 <primary sortas="b-lddlibc4">lddlibc4</primary>
481 </indexterm>
482 </listitem>
483 </varlistentry>
484
485 <varlistentry id="locale">
486 <term><command>locale</command></term>
487 <listitem>
488 <para>Prints various information about the current locale</para>
489 <indexterm zone="ch-system-glibc locale">
490 <primary sortas="b-locale">locale</primary>
491 </indexterm>
492 </listitem>
493 </varlistentry>
494
495 <varlistentry id="localedef">
496 <term><command>localedef</command></term>
497 <listitem>
498 <para>Compiles locale specifications</para>
499 <indexterm zone="ch-system-glibc localedef">
500 <primary sortas="b-localedef">localedef</primary>
501 </indexterm>
502 </listitem>
503 </varlistentry>
504
505 <varlistentry id="mtrace">
506 <term><command>mtrace</command></term>
507 <listitem>
508 <para>Reads and interprets a memory trace file and displays a summary
509 in human-readable format</para>
510 <indexterm zone="ch-system-glibc mtrace">
511 <primary sortas="b-mtrace">mtrace</primary>
512 </indexterm>
513 </listitem>
514 </varlistentry>
515
516 <varlistentry id="nscd">
517 <term><command>nscd</command></term>
518 <listitem>
519 <para>A daemon that provides a cache for the most common name
520 service requests</para>
521 <indexterm zone="ch-system-glibc nscd">
522 <primary sortas="b-nscd">nscd</primary>
523 </indexterm>
524 </listitem>
525 </varlistentry>
526
527 <varlistentry id="pcprofiledump">
528 <term><command>pcprofiledump</command></term>
529 <listitem>
530 <para>Dumps information generated by PC profiling</para>
531 <indexterm zone="ch-system-glibc pcprofiledump">
532 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
533 </indexterm>
534 </listitem>
535 </varlistentry>
536
537 <varlistentry id="pt_chown">
538 <term><command>pt_chown</command></term>
539 <listitem>
540 <para>A helper program for <command>grantpt</command> to set the owner,
541 group and access permissions of a slave pseudo terminal</para>
542 <indexterm zone="ch-system-glibc pt_chown">
543 <primary sortas="b-pt_chown">pt_chown</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="rpcgen">
549 <term><command>rpcgen</command></term>
550 <listitem>
551 <para>Generates C code to implement the Remote Procedure Call (RPC)
552 protocol</para>
553 <indexterm zone="ch-system-glibc rpcgen">
554 <primary sortas="b-rpcgen">rpcgen</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="rpcinfo">
560 <term><command>rpcinfo</command></term>
561 <listitem>
562 <para>Makes an RPC call to an RPC server</para>
563 <indexterm zone="ch-system-glibc rpcinfo">
564 <primary sortas="b-rpcinfo">rpcinfo</primary>
565 </indexterm>
566 </listitem>
567 </varlistentry>
568
569 <varlistentry id="sln">
570 <term><command>sln</command></term>
571 <listitem>
572 <para>A statically linked <command>ln</command> program</para>
573 <indexterm zone="ch-system-glibc sln">
574 <primary sortas="b-sln">sln</primary>
575 </indexterm>
576 </listitem>
577 </varlistentry>
578
579 <varlistentry id="sprof">
580 <term><command>sprof</command></term>
581 <listitem>
582 <para>Reads and displays shared object profiling data</para>
583 <indexterm zone="ch-system-glibc sprof">
584 <primary sortas="b-sprof">sprof</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="tzselect">
590 <term><command>tzselect</command></term>
591 <listitem>
592 <para>Asks the user about the location of the system and reports
593 the corresponding time zone description</para>
594 <indexterm zone="ch-system-glibc tzselect">
595 <primary sortas="b-tzselect">tzselect</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="xtrace">
601 <term><command>xtrace</command></term>
602 <listitem>
603 <para>Traces the execution of a program by printing the currently
604 executed function</para>
605 <indexterm zone="ch-system-glibc xtrace">
606 <primary sortas="b-xtrace">xtrace</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610
611 <varlistentry id="zdump">
612 <term><command>zdump</command></term>
613 <listitem>
614 <para>The time zone dumper</para>
615 <indexterm zone="ch-system-glibc zdump">
616 <primary sortas="b-zdump">zdump</primary>
617 </indexterm>
618 </listitem>
619 </varlistentry>
620
621 <varlistentry id="zic">
622 <term><command>zic</command></term>
623 <listitem>
624 <para>The time zone compiler</para>
625 <indexterm zone="ch-system-glibc zic">
626 <primary sortas="b-zic">zic</primary>
627 </indexterm>
628 </listitem>
629 </varlistentry>
630
631 <varlistentry id="ld.so">
632 <term><filename class="libraryfile">ld.so</filename></term>
633 <listitem>
634 <para>The helper program for shared library executables</para>
635 <indexterm zone="ch-system-glibc ld.so">
636 <primary sortas="c-ld.so">ld.so</primary>
637 </indexterm>
638 </listitem>
639 </varlistentry>
640
641 <varlistentry id="libBrokenLocale">
642 <term><filename class="libraryfile">libBrokenLocale</filename></term>
643 <listitem>
644 <para>Used internally by Glibc as a gross hack to get broken programs
645 (e.g., some Motif applications) running. See comments in
646 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
647 for more information</para>
648 <indexterm zone="ch-system-glibc libBrokenLocale">
649 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 <varlistentry id="libSegFault">
655 <term><filename class="libraryfile">libSegFault</filename></term>
656 <listitem>
657 <para>The segmentation fault signal handler, used by
658 <command>catchsegv</command></para>
659 <indexterm zone="ch-system-glibc libSegFault">
660 <primary sortas="c-libSegFault">libSegFault</primary>
661 </indexterm>
662 </listitem>
663 </varlistentry>
664
665 <varlistentry id="libanl">
666 <term><filename class="libraryfile">libanl</filename></term>
667 <listitem>
668 <para>An asynchronous name lookup library</para>
669 <indexterm zone="ch-system-glibc libanl">
670 <primary sortas="c-libanl">libanl</primary>
671 </indexterm>
672 </listitem>
673 </varlistentry>
674
675 <varlistentry id="libbsd-compat">
676 <term><filename class="libraryfile">libbsd-compat</filename></term>
677 <listitem>
678 <para>Provides the portability needed in order to run certain
679 Berkeley Software Distribution (BSD) programs under Linux</para>
680 <indexterm zone="ch-system-glibc libbsd-compat">
681 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
682 </indexterm>
683 </listitem>
684 </varlistentry>
685
686 <varlistentry id="libc">
687 <term><filename class="libraryfile">libc</filename></term>
688 <listitem>
689 <para>The main C library</para>
690 <indexterm zone="ch-system-glibc libc">
691 <primary sortas="c-libc">libc</primary>
692 </indexterm>
693 </listitem>
694 </varlistentry>
695
696 <varlistentry id="libcidn">
697 <term><filename class="libraryfile">libcidn</filename></term>
698 <listitem>
699 <para>Used internally by Glibc for handling internationalized domain
700 names in the <function>getaddrinfo()</function> function</para>
701 <indexterm zone="ch-system-glibc libcrypt">
702 <primary sortas="c-libcrypt">libcrypt</primary>
703 </indexterm>
704 </listitem>
705 </varlistentry>
706
707 <varlistentry id="libcrypt">
708 <term><filename class="libraryfile">libcrypt</filename></term>
709 <listitem>
710 <para>The cryptography library</para>
711 <indexterm zone="ch-system-glibc libcrypt">
712 <primary sortas="c-libcrypt">libcrypt</primary>
713 </indexterm>
714 </listitem>
715 </varlistentry>
716
717 <varlistentry id="libdl">
718 <term><filename class="libraryfile">libdl</filename></term>
719 <listitem>
720 <para>The dynamic linking interface library</para>
721 <indexterm zone="ch-system-glibc libdl">
722 <primary sortas="c-libdl">libdl</primary>
723 </indexterm>
724 </listitem>
725 </varlistentry>
726
727 <varlistentry id="libg">
728 <term><filename class="libraryfile">libg</filename></term>
729 <listitem>
730 <para>Dummy library containing no functions. Previously was a runtime
731 library for <command>g++</command></para>
732 <indexterm zone="ch-system-glibc libg">
733 <primary sortas="c-libg">libg</primary>
734 </indexterm>
735 </listitem>
736 </varlistentry>
737
738 <varlistentry id="libieee">
739 <term><filename class="libraryfile">libieee</filename></term>
740 <listitem>
741 <para>Linking in this module forces error handling rules for math
742 functions as defined by the Institute of Electrical and Electronic
743 Engineers (IEEE). The default is POSIX.1 error handling</para>
744 <indexterm zone="ch-system-glibc libieee">
745 <primary sortas="c-libieee">libieee</primary>
746 </indexterm>
747 </listitem>
748 </varlistentry>
749
750 <varlistentry id="libm">
751 <term><filename class="libraryfile">libm</filename></term>
752 <listitem>
753 <para>The mathematical library</para>
754 <indexterm zone="ch-system-glibc libm">
755 <primary sortas="c-libm">libm</primary>
756 </indexterm>
757 </listitem>
758 </varlistentry>
759
760 <varlistentry id="libmcheck">
761 <term><filename class="libraryfile">libmcheck</filename></term>
762 <listitem>
763 <para>Turns on memory allocation checking when linked to</para>
764 <indexterm zone="ch-system-glibc libmcheck">
765 <primary sortas="c-libmcheck">libmcheck</primary>
766 </indexterm>
767 </listitem>
768 </varlistentry>
769
770 <varlistentry id="libmemusage">
771 <term><filename class="libraryfile">libmemusage</filename></term>
772 <listitem>
773 <para>Used by <command>memusage</command> to help collect
774 information about the memory usage of a program</para>
775 <indexterm zone="ch-system-glibc libmemusage">
776 <primary sortas="c-libmemusage">libmemusage</primary>
777 </indexterm>
778 </listitem>
779 </varlistentry>
780
781 <varlistentry id="libnsl">
782 <term><filename class="libraryfile">libnsl</filename></term>
783 <listitem>
784 <para>The network services library</para>
785 <indexterm zone="ch-system-glibc libnsl">
786 <primary sortas="c-libnsl">libnsl</primary>
787 </indexterm>
788 </listitem>
789 </varlistentry>
790
791 <varlistentry id="libnss">
792 <term><filename class="libraryfile">libnss</filename></term>
793 <listitem>
794 <para>The Name Service Switch libraries, containing functions for
795 resolving host names, user names, group names, aliases, services,
796 protocols, etc.</para>
797 <indexterm zone="ch-system-glibc libnss">
798 <primary sortas="c-libnss">libnss</primary>
799 </indexterm>
800 </listitem>
801 </varlistentry>
802
803 <varlistentry id="libpcprofile">
804 <term><filename class="libraryfile">libpcprofile</filename></term>
805 <listitem>
806 <para>Contains profiling functions used to track the amount of CPU
807 time spent in specific source code lines</para>
808 <indexterm zone="ch-system-glibc libpcprofile">
809 <primary sortas="c-libpcprofile">libpcprofile</primary>
810 </indexterm>
811 </listitem>
812 </varlistentry>
813
814 <varlistentry id="libpthread">
815 <term><filename class="libraryfile">libpthread</filename></term>
816 <listitem>
817 <para>The POSIX threads library</para>
818 <indexterm zone="ch-system-glibc libpthread">
819 <primary sortas="c-libpthread">libpthread</primary>
820 </indexterm>
821 </listitem>
822 </varlistentry>
823
824 <varlistentry id="libresolv">
825 <term><filename class="libraryfile">libresolv</filename></term>
826 <listitem>
827 <para>Contains functions for creating, sending, and interpreting
828 packets to the Internet domain name servers</para>
829 <indexterm zone="ch-system-glibc libresolv">
830 <primary sortas="c-libresolv">libresolv</primary>
831 </indexterm>
832 </listitem>
833 </varlistentry>
834
835 <varlistentry id="librpcsvc">
836 <term><filename class="libraryfile">librpcsvc</filename></term>
837 <listitem>
838 <para>Contains functions providing miscellaneous RPC services</para>
839 <indexterm zone="ch-system-glibc librpcsvc">
840 <primary sortas="c-librpcsvc">librpcsvc</primary>
841 </indexterm>
842 </listitem>
843 </varlistentry>
844
845 <varlistentry id="librt">
846 <term><filename class="libraryfile">librt</filename></term>
847 <listitem>
848 <para>Contains functions providing most of the interfaces specified
849 by the POSIX.1b Realtime Extension</para>
850 <indexterm zone="ch-system-glibc librt">
851 <primary sortas="c-librt">librt</primary>
852 </indexterm>
853 </listitem>
854 </varlistentry>
855
856 <varlistentry id="libthread_db">
857 <term><filename class="libraryfile">libthread_db</filename></term>
858 <listitem>
859 <para>Contains functions useful for building debuggers for
860 multi-threaded programs</para>
861 <indexterm zone="ch-system-glibc libthread_db">
862 <primary sortas="c-libthread_db">libthread_db</primary>
863 </indexterm>
864 </listitem>
865 </varlistentry>
866
867 <varlistentry id="libutil">
868 <term><filename class="libraryfile">libutil</filename></term>
869 <listitem>
870 <para>Contains code for <quote>standard</quote> functions used in
871 many different Unix utilities</para>
872 <indexterm zone="ch-system-glibc libutil">
873 <primary sortas="c-libutil">libutil</primary>
874 </indexterm>
875 </listitem>
876 </varlistentry>
877
878 </variablelist>
879
880 </sect2>
881
882</sect1>
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