source: chapter06/glibc.xml@ a55c9ad

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Last change on this file since a55c9ad was a55c9ad, checked in by Bruce Dubbs <bdubbs@…>, 14 years ago

Update known failure problems in glibc tests

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9185 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<!--
65 This should have been fixed a long time ago.
66
67 <para>In the vi_VN.TCVN locale, <command>bash</command> enters an infinite
68 loop at startup. It is unknown whether this is a <command>bash</command>
69 bug or a Glibc problem. Disable installation of this locale in order to
70 avoid the problem:</para>
71
72<screen><userinput remap="pre">sed -i '/vi_VN.TCVN/d' localedata/SUPPORTED</userinput></screen>
73-->
74
75 <para>When running <command>make install</command>, a script called
76 <filename>test-installation.pl</filename> performs a small sanity test on
77 our newly installed Glibc. However, because our toolchain still points to
78 the <filename class="directory">/tools</filename> directory, the sanity
79 test would be carried out against the wrong Glibc. We can force the script
80 to check the Glibc we have just installed with the following:</para>
81
82<screen><userinput remap="pre">DL=$(readelf -l /bin/sh | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
83sed -i &quot;s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=$DL -o|&quot; \
84 scripts/test-installation.pl
85unset DL</userinput></screen>
86
87 <para>The <command>ldd</command> shell script contains Bash-specific
88 syntax. Change its default program interpreter to <command>/bin/bash</command>
89 in case another <command>/bin/sh</command> is installed as described in the
90 <ulink url="&blfs-root;view/svn/postlfs/shells.html">Shells</ulink>
91 chapter of the BLFS book:</para>
92
93<screen><userinput remap="pre">sed -i 's|@BASH@|/bin/bash|' elf/ldd.bash.in</userinput></screen>
94
95 <para>The Glibc documentation recommends building Glibc outside of the source
96 directory in a dedicated build directory:</para>
97
98<screen><userinput remap="pre">mkdir -v ../glibc-build
99cd ../glibc-build</userinput></screen>
100
101 <para>As in Chapter 5, add the needed compiler flags to CFLAGS for x86 machines.
102 Here, the optimization of the library is also set for the gcc compiler to
103 enhance compilation speed (-pipe) and package performance (-O3).</para>
104
105<screen><userinput remap="configure">case `uname -m` in
106 i?86) echo "CFLAGS += -march=i486 -mtune=native -O3 -pipe" &gt; configparms ;;
107esac</userinput></screen>
108
109 <para>Prepare Glibc for compilation:</para>
110
111<screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/usr \
112 --disable-profile --enable-add-ons \
113 --enable-kernel=2.6.18 --libexecdir=/usr/lib/glibc</userinput></screen>
114
115 <variablelist>
116 <title>The meaning of the new configure options:</title>
117
118 <varlistentry>
119 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
120 <listitem>
121 <para>This changes the location of the <command>pt_chown</command>
122 program from its default of <filename
123 class="directory">/usr/libexec</filename> to <filename
124 class="directory">/usr/lib/glibc</filename>.</para>
125 </listitem>
126 </varlistentry>
127
128 </variablelist>
129
130 <para>Compile the package:</para>
131
132<screen><userinput remap="make">make</userinput></screen>
133
134 <important>
135 <para>In this section, the test suite for Glibc is considered critical.
136 Do not skip it under any circumstance.</para>
137 </important>
138
139 <para>Before running the tests, copy a file from the source tree into our
140 build tree to prevent a couple of test failures, then test the
141 results:</para>
142
143<screen><userinput remap="test">cp -v ../glibc-&glibc-version;/iconvdata/gconv-modules iconvdata
144make -k check 2&gt;&amp;1 | tee glibc-check-log
145grep Error glibc-check-log</userinput></screen>
146
147 <para>You will probably see an expected (ignored) failure in the
148 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
149 is somewhat dependent on the host system. This is a list of the most
150 common issues:</para>
151
152 <itemizedlist>
153 <!-- Check again after updating from gcc-4.1.x -->
154 <!-- Haven;t seen this in quite a while <listitem>
155 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
156 using the 4.1 series of GCC.</para>
157 </listitem> -->
158 <!-- Was true in glibc-2.3.6, rt/tst-cpuclock2 in glibc-2.11.1 -->
159 <listitem>
160
161 <para>The <emphasis>nptl/tst-clock2</emphasis>,
162 <emphasis>nptl/tst-attr3</emphasis>, and
163 <emphasis>rt/tst-cpuclock2</emphasis>
164 tests have been known to fail. The
165 reason is not completely understood, but indications are that minor
166 timing issues can trigger these failures.</para>
167
168 </listitem>
169 <listitem>
170 <para>The math tests sometimes fail when running on
171 systems where the CPU is not a relatively new genuine Intel or
172 authentic AMD processor.</para>
173 </listitem>
174 <listitem>
175 <para>If you have mounted the LFS partition with the
176 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
177 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
178 use the <parameter>noatime</parameter> option while building LFS.</para>
179 </listitem>
180 <listitem>
181 <para>When running on older and slower hardware or on systems under
182 load, some tests can fail because of test timeouts being exceeded.</para>
183 </listitem>
184 </itemizedlist>
185
186 <para>Though it is a harmless message, the install stage of Glibc will
187 complain about the absence of <filename>/etc/ld.so.conf</filename>.
188 Prevent this warning with:</para>
189
190<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
191
192 <para>Install the package:</para>
193
194<screen><userinput remap="install">make install</userinput></screen>
195
196 <para>The locales that can make the system respond in a different language
197 were not installed by the above command. None of the locales are required,
198 but if some of them are missing, testsuites of the future packages would
199 skip important testcases.</para>
200
201 <para>Individual locales can be installed using the
202 <command>localedef</command> program. E.g., the first
203 <command>localedef</command> command below combines the
204 <filename>/usr/share/i18n/locales/cs_CZ</filename>
205 charset-independent locale definition with the
206 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
207 charmap definition and appends the result to the
208 <filename>/usr/lib/locale/locale-archive</filename> file.
209 The following instructions will install the minimum set of
210 locales necessary for the optimal coverage of tests:</para>
211
212<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
213localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
214localedef -i de_DE -f ISO-8859-1 de_DE
215localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
216localedef -i de_DE -f UTF-8 de_DE.UTF-8
217localedef -i en_HK -f ISO-8859-1 en_HK
218localedef -i en_PH -f ISO-8859-1 en_PH
219localedef -i en_US -f ISO-8859-1 en_US
220localedef -i en_US -f UTF-8 en_US.UTF-8
221localedef -i es_MX -f ISO-8859-1 es_MX
222localedef -i fa_IR -f UTF-8 fa_IR
223localedef -i fr_FR -f ISO-8859-1 fr_FR
224localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
225localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
226localedef -i it_IT -f ISO-8859-1 it_IT
227localedef -i ja_JP -f EUC-JP ja_JP
228localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
229localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
230
231 <para>In addition, install the locale for your own country, language and
232 character set.</para>
233
234 <para>Alternatively, install all locales listed in the
235 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
236 (it includes every locale listed above and many more) at once with the
237 following time-consuming command:</para>
238
239<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
240
241 <para>Then use the <command>localedef</command> command to create and
242 install locales not listed in the
243 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
244 in the unlikely case you need them.</para>
245 <!-- The Live CD patches the localedata/SUPPORTED file instead of
246 running localedef, the results are equivalent -->
247
248 </sect2>
249
250 <sect2 id="conf-glibc" role="configuration">
251 <title>Configuring Glibc</title>
252
253 <indexterm zone="conf-glibc">
254 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
255 </indexterm>
256
257 <indexterm zone="conf-glibc">
258 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
259 </indexterm>
260
261 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
262 because, although Glibc provides defaults when this file is missing or corrupt,
263 the Glibc defaults do not work well in a networked environment. The time zone
264 also needs to be configured.</para>
265
266 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
267 following:</para>
268
269<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
270<literal># Begin /etc/nsswitch.conf
271
272passwd: files
273group: files
274shadow: files
275
276hosts: files dns
277networks: files
278
279protocols: files
280services: files
281ethers: files
282rpc: files
283
284# End /etc/nsswitch.conf</literal>
285EOF</userinput></screen>
286
287 <para>One way to determine the local time zone, run the following
288 script:</para>
289
290<screen role="nodump"><userinput>tzselect</userinput></screen>
291
292 <para>After answering a few questions about the location, the script will
293 output the name of the time zone (e.g.,
294 <emphasis>America/Edmonton</emphasis>). There are also some other possible
295 timezones listed in <filename
296 class='directory'>/usr/share/zoneinfo</filename> such as
297 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
298 are not identified by the script but can be used.</para>
299
300 <para>Then create the <filename>/etc/localtime</filename> file by
301 running:</para>
302
303<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
304 /etc/localtime</userinput></screen>
305
306 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
307 time zone selected (e.g., Canada/Eastern).</para>
308
309 <variablelist>
310 <title>The meaning of the cp option:</title>
311
312 <varlistentry>
313 <term><parameter>--remove-destination</parameter></term>
314 <listitem>
315 <para>This is needed to force removal of the already existing symbolic
316 link. The reason for copying the file instead of using a symlink is to
317 cover the situation where <filename class="directory">/usr</filename>
318 is on a separate partition. This could be important when booted into
319 single user mode.</para>
320 </listitem>
321 </varlistentry>
322
323 </variablelist>
324
325 </sect2>
326
327 <sect2 id="conf-ld" role="configuration">
328 <title>Configuring the Dynamic Loader</title>
329
330 <indexterm zone="conf-ld">
331 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
332 </indexterm>
333
334 <para>By default, the dynamic loader (<filename
335 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
336 <filename class="directory">/lib</filename> and <filename
337 class="directory">/usr/lib</filename> for dynamic libraries that are
338 needed by programs as they are run. However, if there are libraries in
339 directories other than <filename class="directory">/lib</filename> and
340 <filename class="directory">/usr/lib</filename>, these need to be added
341 to the <filename>/etc/ld.so.conf</filename> file in order for the
342 dynamic loader to find them. Two directories that are commonly known
343 to contain additional libraries are <filename
344 class="directory">/usr/local/lib</filename> and <filename
345 class="directory">/opt/lib</filename>, so add those directories to the
346 dynamic loader's search path.</para>
347
348 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
349 following:</para>
350
351<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
352<literal># Begin /etc/ld.so.conf
353
354/usr/local/lib
355/opt/lib
356
357# End /etc/ld.so.conf</literal>
358EOF</userinput></screen>
359
360 </sect2>
361
362 <sect2 id="contents-glibc" role="content">
363 <title>Contents of Glibc</title>
364
365 <segmentedlist>
366 <segtitle>Installed programs</segtitle>
367 <segtitle>Installed libraries</segtitle>
368
369 <seglistitem>
370 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
371 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
372 pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
373 zdump, and zic</seg>
374 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
375 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
376 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
377 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
378 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
379 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
380 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
381 libthread_db.so, and libutil.{a,so}</seg>
382 </seglistitem>
383 </segmentedlist>
384
385 <variablelist>
386 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
387 <?dbfo list-presentation="list"?>
388 <?dbhtml list-presentation="table"?>
389
390 <varlistentry id="catchsegv">
391 <term><command>catchsegv</command></term>
392 <listitem>
393 <para>Can be used to create a stack trace when a program
394 terminates with a segmentation fault</para>
395 <indexterm zone="ch-system-glibc catchsegv">
396 <primary sortas="b-catchsegv">catchsegv</primary>
397 </indexterm>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry id="gencat">
402 <term><command>gencat</command></term>
403 <listitem>
404 <para>Generates message catalogues</para>
405 <indexterm zone="ch-system-glibc gencat">
406 <primary sortas="b-gencat">gencat</primary>
407 </indexterm>
408 </listitem>
409 </varlistentry>
410
411 <varlistentry id="getconf">
412 <term><command>getconf</command></term>
413 <listitem>
414 <para>Displays the system configuration values for file system
415 specific variables</para>
416 <indexterm zone="ch-system-glibc getconf">
417 <primary sortas="b-getconf">getconf</primary>
418 </indexterm>
419 </listitem>
420 </varlistentry>
421
422 <varlistentry id="getent">
423 <term><command>getent</command></term>
424 <listitem>
425 <para>Gets entries from an administrative database</para>
426 <indexterm zone="ch-system-glibc getent">
427 <primary sortas="b-getent">getent</primary>
428 </indexterm>
429 </listitem>
430 </varlistentry>
431
432 <varlistentry id="iconv">
433 <term><command>iconv</command></term>
434 <listitem>
435 <para>Performs character set conversion</para>
436 <indexterm zone="ch-system-glibc iconv">
437 <primary sortas="b-iconv">iconv</primary>
438 </indexterm>
439 </listitem>
440 </varlistentry>
441
442 <varlistentry id="iconvconfig">
443 <term><command>iconvconfig</command></term>
444 <listitem>
445 <para>Creates fastloading <command>iconv</command> module configuration
446 files</para>
447 <indexterm zone="ch-system-glibc iconvconfig">
448 <primary sortas="b-iconvconfig">iconvconfig</primary>
449 </indexterm>
450 </listitem>
451 </varlistentry>
452
453 <varlistentry id="ldconfig">
454 <term><command>ldconfig</command></term>
455 <listitem>
456 <para>Configures the dynamic linker runtime bindings</para>
457 <indexterm zone="ch-system-glibc ldconfig">
458 <primary sortas="b-ldconfig">ldconfig</primary>
459 </indexterm>
460 </listitem>
461 </varlistentry>
462
463 <varlistentry id="ldd">
464 <term><command>ldd</command></term>
465 <listitem>
466 <para>Reports which shared libraries are required
467 by each given program or shared library</para>
468 <indexterm zone="ch-system-glibc ldd">
469 <primary sortas="b-ldd">ldd</primary>
470 </indexterm>
471 </listitem>
472 </varlistentry>
473
474 <varlistentry id="lddlibc4">
475 <term><command>lddlibc4</command></term>
476 <listitem>
477 <para>Assists <command>ldd</command> with object files</para>
478 <indexterm zone="ch-system-glibc lddlibc4">
479 <primary sortas="b-lddlibc4">lddlibc4</primary>
480 </indexterm>
481 </listitem>
482 </varlistentry>
483
484 <varlistentry id="locale">
485 <term><command>locale</command></term>
486 <listitem>
487 <para>Prints various information about the current locale</para>
488 <indexterm zone="ch-system-glibc locale">
489 <primary sortas="b-locale">locale</primary>
490 </indexterm>
491 </listitem>
492 </varlistentry>
493
494 <varlistentry id="localedef">
495 <term><command>localedef</command></term>
496 <listitem>
497 <para>Compiles locale specifications</para>
498 <indexterm zone="ch-system-glibc localedef">
499 <primary sortas="b-localedef">localedef</primary>
500 </indexterm>
501 </listitem>
502 </varlistentry>
503
504 <varlistentry id="mtrace">
505 <term><command>mtrace</command></term>
506 <listitem>
507 <para>Reads and interprets a memory trace file and displays a summary
508 in human-readable format</para>
509 <indexterm zone="ch-system-glibc mtrace">
510 <primary sortas="b-mtrace">mtrace</primary>
511 </indexterm>
512 </listitem>
513 </varlistentry>
514
515 <varlistentry id="nscd">
516 <term><command>nscd</command></term>
517 <listitem>
518 <para>A daemon that provides a cache for the most common name
519 service requests</para>
520 <indexterm zone="ch-system-glibc nscd">
521 <primary sortas="b-nscd">nscd</primary>
522 </indexterm>
523 </listitem>
524 </varlistentry>
525
526 <varlistentry id="pcprofiledump">
527 <term><command>pcprofiledump</command></term>
528 <listitem>
529 <para>Dumps information generated by PC profiling</para>
530 <indexterm zone="ch-system-glibc pcprofiledump">
531 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
532 </indexterm>
533 </listitem>
534 </varlistentry>
535
536 <varlistentry id="pt_chown">
537 <term><command>pt_chown</command></term>
538 <listitem>
539 <para>A helper program for <command>grantpt</command> to set the owner,
540 group and access permissions of a slave pseudo terminal</para>
541 <indexterm zone="ch-system-glibc pt_chown">
542 <primary sortas="b-pt_chown">pt_chown</primary>
543 </indexterm>
544 </listitem>
545 </varlistentry>
546
547 <varlistentry id="rpcgen">
548 <term><command>rpcgen</command></term>
549 <listitem>
550 <para>Generates C code to implement the Remote Procedure Call (RPC)
551 protocol</para>
552 <indexterm zone="ch-system-glibc rpcgen">
553 <primary sortas="b-rpcgen">rpcgen</primary>
554 </indexterm>
555 </listitem>
556 </varlistentry>
557
558 <varlistentry id="rpcinfo">
559 <term><command>rpcinfo</command></term>
560 <listitem>
561 <para>Makes an RPC call to an RPC server</para>
562 <indexterm zone="ch-system-glibc rpcinfo">
563 <primary sortas="b-rpcinfo">rpcinfo</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="sln">
569 <term><command>sln</command></term>
570 <listitem>
571 <para>A statically linked <command>ln</command> program</para>
572 <indexterm zone="ch-system-glibc sln">
573 <primary sortas="b-sln">sln</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="sprof">
579 <term><command>sprof</command></term>
580 <listitem>
581 <para>Reads and displays shared object profiling data</para>
582 <indexterm zone="ch-system-glibc sprof">
583 <primary sortas="b-sprof">sprof</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="tzselect">
589 <term><command>tzselect</command></term>
590 <listitem>
591 <para>Asks the user about the location of the system and reports
592 the corresponding time zone description</para>
593 <indexterm zone="ch-system-glibc tzselect">
594 <primary sortas="b-tzselect">tzselect</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="xtrace">
600 <term><command>xtrace</command></term>
601 <listitem>
602 <para>Traces the execution of a program by printing the currently
603 executed function</para>
604 <indexterm zone="ch-system-glibc xtrace">
605 <primary sortas="b-xtrace">xtrace</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="zdump">
611 <term><command>zdump</command></term>
612 <listitem>
613 <para>The time zone dumper</para>
614 <indexterm zone="ch-system-glibc zdump">
615 <primary sortas="b-zdump">zdump</primary>
616 </indexterm>
617 </listitem>
618 </varlistentry>
619
620 <varlistentry id="zic">
621 <term><command>zic</command></term>
622 <listitem>
623 <para>The time zone compiler</para>
624 <indexterm zone="ch-system-glibc zic">
625 <primary sortas="b-zic">zic</primary>
626 </indexterm>
627 </listitem>
628 </varlistentry>
629
630 <varlistentry id="ld.so">
631 <term><filename class="libraryfile">ld.so</filename></term>
632 <listitem>
633 <para>The helper program for shared library executables</para>
634 <indexterm zone="ch-system-glibc ld.so">
635 <primary sortas="c-ld.so">ld.so</primary>
636 </indexterm>
637 </listitem>
638 </varlistentry>
639
640 <varlistentry id="libBrokenLocale">
641 <term><filename class="libraryfile">libBrokenLocale</filename></term>
642 <listitem>
643 <para>Used internally by Glibc as a gross hack to get broken programs
644 (e.g., some Motif applications) running. See comments in
645 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
646 for more information</para>
647 <indexterm zone="ch-system-glibc libBrokenLocale">
648 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="libSegFault">
654 <term><filename class="libraryfile">libSegFault</filename></term>
655 <listitem>
656 <para>The segmentation fault signal handler, used by
657 <command>catchsegv</command></para>
658 <indexterm zone="ch-system-glibc libSegFault">
659 <primary sortas="c-libSegFault">libSegFault</primary>
660 </indexterm>
661 </listitem>
662 </varlistentry>
663
664 <varlistentry id="libanl">
665 <term><filename class="libraryfile">libanl</filename></term>
666 <listitem>
667 <para>An asynchronous name lookup library</para>
668 <indexterm zone="ch-system-glibc libanl">
669 <primary sortas="c-libanl">libanl</primary>
670 </indexterm>
671 </listitem>
672 </varlistentry>
673
674 <varlistentry id="libbsd-compat">
675 <term><filename class="libraryfile">libbsd-compat</filename></term>
676 <listitem>
677 <para>Provides the portability needed in order to run certain
678 Berkeley Software Distribution (BSD) programs under Linux</para>
679 <indexterm zone="ch-system-glibc libbsd-compat">
680 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="libc">
686 <term><filename class="libraryfile">libc</filename></term>
687 <listitem>
688 <para>The main C library</para>
689 <indexterm zone="ch-system-glibc libc">
690 <primary sortas="c-libc">libc</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="libcidn">
696 <term><filename class="libraryfile">libcidn</filename></term>
697 <listitem>
698 <para>Used internally by Glibc for handling internationalized domain
699 names in the <function>getaddrinfo()</function> function</para>
700 <indexterm zone="ch-system-glibc libcidn">
701 <primary sortas="c-libcidn">libcidn</primary>
702 </indexterm>
703 </listitem>
704 </varlistentry>
705
706 <varlistentry id="libcrypt">
707 <term><filename class="libraryfile">libcrypt</filename></term>
708 <listitem>
709 <para>The cryptography library</para>
710 <indexterm zone="ch-system-glibc libcrypt">
711 <primary sortas="c-libcrypt">libcrypt</primary>
712 </indexterm>
713 </listitem>
714 </varlistentry>
715
716 <varlistentry id="libdl">
717 <term><filename class="libraryfile">libdl</filename></term>
718 <listitem>
719 <para>The dynamic linking interface library</para>
720 <indexterm zone="ch-system-glibc libdl">
721 <primary sortas="c-libdl">libdl</primary>
722 </indexterm>
723 </listitem>
724 </varlistentry>
725
726 <varlistentry id="libg">
727 <term><filename class="libraryfile">libg</filename></term>
728 <listitem>
729 <para>Dummy library containing no functions. Previously was a runtime
730 library for <command>g++</command></para>
731 <indexterm zone="ch-system-glibc libg">
732 <primary sortas="c-libg">libg</primary>
733 </indexterm>
734 </listitem>
735 </varlistentry>
736
737 <varlistentry id="libieee">
738 <term><filename class="libraryfile">libieee</filename></term>
739 <listitem>
740 <para>Linking in this module forces error handling rules for math
741 functions as defined by the Institute of Electrical and Electronic
742 Engineers (IEEE). The default is POSIX.1 error handling</para>
743 <indexterm zone="ch-system-glibc libieee">
744 <primary sortas="c-libieee">libieee</primary>
745 </indexterm>
746 </listitem>
747 </varlistentry>
748
749 <varlistentry id="libm">
750 <term><filename class="libraryfile">libm</filename></term>
751 <listitem>
752 <para>The mathematical library</para>
753 <indexterm zone="ch-system-glibc libm">
754 <primary sortas="c-libm">libm</primary>
755 </indexterm>
756 </listitem>
757 </varlistentry>
758
759 <varlistentry id="libmcheck">
760 <term><filename class="libraryfile">libmcheck</filename></term>
761 <listitem>
762 <para>Turns on memory allocation checking when linked to</para>
763 <indexterm zone="ch-system-glibc libmcheck">
764 <primary sortas="c-libmcheck">libmcheck</primary>
765 </indexterm>
766 </listitem>
767 </varlistentry>
768
769 <varlistentry id="libmemusage">
770 <term><filename class="libraryfile">libmemusage</filename></term>
771 <listitem>
772 <para>Used by <command>memusage</command> to help collect
773 information about the memory usage of a program</para>
774 <indexterm zone="ch-system-glibc libmemusage">
775 <primary sortas="c-libmemusage">libmemusage</primary>
776 </indexterm>
777 </listitem>
778 </varlistentry>
779
780 <varlistentry id="libnsl">
781 <term><filename class="libraryfile">libnsl</filename></term>
782 <listitem>
783 <para>The network services library</para>
784 <indexterm zone="ch-system-glibc libnsl">
785 <primary sortas="c-libnsl">libnsl</primary>
786 </indexterm>
787 </listitem>
788 </varlistentry>
789
790 <varlistentry id="libnss">
791 <term><filename class="libraryfile">libnss</filename></term>
792 <listitem>
793 <para>The Name Service Switch libraries, containing functions for
794 resolving host names, user names, group names, aliases, services,
795 protocols, etc.</para>
796 <indexterm zone="ch-system-glibc libnss">
797 <primary sortas="c-libnss">libnss</primary>
798 </indexterm>
799 </listitem>
800 </varlistentry>
801
802 <varlistentry id="libpcprofile">
803 <term><filename class="libraryfile">libpcprofile</filename></term>
804 <listitem>
805 <para>Contains profiling functions used to track the amount of CPU
806 time spent in specific source code lines</para>
807 <indexterm zone="ch-system-glibc libpcprofile">
808 <primary sortas="c-libpcprofile">libpcprofile</primary>
809 </indexterm>
810 </listitem>
811 </varlistentry>
812
813 <varlistentry id="libpthread">
814 <term><filename class="libraryfile">libpthread</filename></term>
815 <listitem>
816 <para>The POSIX threads library</para>
817 <indexterm zone="ch-system-glibc libpthread">
818 <primary sortas="c-libpthread">libpthread</primary>
819 </indexterm>
820 </listitem>
821 </varlistentry>
822
823 <varlistentry id="libresolv">
824 <term><filename class="libraryfile">libresolv</filename></term>
825 <listitem>
826 <para>Contains functions for creating, sending, and interpreting
827 packets to the Internet domain name servers</para>
828 <indexterm zone="ch-system-glibc libresolv">
829 <primary sortas="c-libresolv">libresolv</primary>
830 </indexterm>
831 </listitem>
832 </varlistentry>
833
834 <varlistentry id="librpcsvc">
835 <term><filename class="libraryfile">librpcsvc</filename></term>
836 <listitem>
837 <para>Contains functions providing miscellaneous RPC services</para>
838 <indexterm zone="ch-system-glibc librpcsvc">
839 <primary sortas="c-librpcsvc">librpcsvc</primary>
840 </indexterm>
841 </listitem>
842 </varlistentry>
843
844 <varlistentry id="librt">
845 <term><filename class="libraryfile">librt</filename></term>
846 <listitem>
847 <para>Contains functions providing most of the interfaces specified
848 by the POSIX.1b Realtime Extension</para>
849 <indexterm zone="ch-system-glibc librt">
850 <primary sortas="c-librt">librt</primary>
851 </indexterm>
852 </listitem>
853 </varlistentry>
854
855 <varlistentry id="libthread_db">
856 <term><filename class="libraryfile">libthread_db</filename></term>
857 <listitem>
858 <para>Contains functions useful for building debuggers for
859 multi-threaded programs</para>
860 <indexterm zone="ch-system-glibc libthread_db">
861 <primary sortas="c-libthread_db">libthread_db</primary>
862 </indexterm>
863 </listitem>
864 </varlistentry>
865
866 <varlistentry id="libutil">
867 <term><filename class="libraryfile">libutil</filename></term>
868 <listitem>
869 <para>Contains code for <quote>standard</quote> functions used in
870 many different Unix utilities</para>
871 <indexterm zone="ch-system-glibc libutil">
872 <primary sortas="c-libutil">libutil</primary>
873 </indexterm>
874 </listitem>
875 </varlistentry>
876
877 </variablelist>
878
879 </sect2>
880
881</sect1>
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