source: BOOK/final-system/common/glibc.xml@ bda8cfb

clfs-1.2 clfs-2.1 clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since bda8cfb was 3514708, checked in by Ken Moffat <zarniwhoop@…>, 18 years ago

Limit the i686 reference in math test failures to the x86 book, and add missing paras re glibc tests to pure64 books.

  • Property mode set to 100644
File size: 30.1 KB
RevLine 
[3f8be484]1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
3 "http://www.oasis-open.org/docbook/xml/4.4/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 <title>Glibc-&glibc-version;</title>
12
13 <indexterm zone="ch-system-glibc">
14 <primary sortas="a-Glibc">Glibc</primary>
15 </indexterm>
16
17 <sect2 role="package">
18 <title/>
19
20 <para>The Glibc package contains the main C library. This library provides
21 the basic routines for allocating memory, searching directories, opening and
22 closing files, reading and writing files, string handling, pattern matching,
23 arithmetic, and so on.</para>
24
25 </sect2>
26
27 <sect2 role="installation">
28 <title>Installation of Glibc</title>
29
30 <note os="z">
[a1fb12f]31 <para>Some packages outside of CLFS suggest installing GNU libiconv in
[3f8be484]32 order to translate data from one encoding to another. The project's
33 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
34 <quote>This library provides an <function>iconv()</function>
35 implementation, for use on systems which don't have one, or whose
36 implementation cannot convert from/to Unicode.</quote> Glibc provides
37 an <function>iconv()</function> implementation and can convert from/to
[a1fb12f]38 Unicode, therefore libiconv is not required on a CLFS system.</para>
[3f8be484]39 </note>
40
41 <para os="b">The Glibc build system is self-contained and will install
42 perfectly, even though the compiler specs file and linker are still
43 pointing at <filename class="directory">/tools</filename>. The specs
44 and linker cannot be adjusted before the Glibc install because the
[8253243]45 Glibc Autoconf tests would give false results and defeat the goal
[3f8be484]46 of achieving a clean build.</para>
47
[39139e4]48 <para os="c">The following patch fixes an issue that can
49 cause <command>localdef</command> to segfault:</para>
[3f8be484]50
51<screen os="d"><userinput>patch -Np1 -i ../&glibc-localedef_segfault-patch;</userinput></screen>
[82f7fed]52
[54dd8b6]53 <para os="p1">The following patch fixes an issue with iconv:</para>
54
55<screen os="p2"><userinput>patch -Np1 -i ../&glibc-iconv_fix-patch;</userinput></screen>
56
[8253243]57 <para os="s1">The following <command>sed</command> fixes a build issue
58 with Glibc. This will prevent <command>nscd</command> from trying to
59 link to libraries that don't exist:</para>
[7d61e92]60
[39139e4]61<screen os="s2"><userinput>cp -v nscd/Makefile{,.orig}
[27beca52]62sed -e "/nscd_stat.o: sysincludes = # nothing/d" nscd/Makefile.orig > \
[39139e4]63 nscd/Makefile</userinput></screen>
[7d61e92]64
[3f8be484]65 <para os="e">The Glibc documentation recommends building Glibc outside of the
66 source directory in a dedicated build directory:</para>
67
[94e6142]68<screen os="f"><userinput>mkdir -v ../glibc-build
[3f8be484]69cd ../glibc-build</userinput></screen>
70
71 <para os="g">Prepare Glibc for compilation:</para>
72
73<screen os="h"><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
74 --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
75 --libexecdir=/usr/lib/glibc</userinput></screen>
76
77 <variablelist os="i">
78 <title>The meaning of the new configure option:</title>
79
80 <varlistentry>
81 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
82 <listitem>
83 <para>This changes the location of the <command>pt_chown</command>
84 program from its default of <filename
85 class="directory">/usr/libexec</filename> to <filename
86 class="directory">/usr/lib/glibc</filename>.</para>
87 </listitem>
88 </varlistentry>
89 </variablelist>
90
91 <para os="j">Compile the package:</para>
92
93<screen os="k"><userinput>make</userinput></screen>
94
95 <important os="l">
[121c48a]96 <para>The test suite for Glibc is considered critical.
[3f8be484]97 Do not skip it under any circumstance.</para>
98 </important>
99
100 <para os="m">Test the results:</para>
101
102<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
103
104<screen os="n"><userinput>make -k check &gt;glibc-check-log 2&gt;&amp;1 ; grep Error glibc-check-log</userinput></screen>
105
106 <para os="o">The Glibc test suite is highly dependent on certain functions of
[10b2850]107 the host system, in particular the kernel. The posix/annexc test normally fails
108 and you should see <literal>Error 1 (ignored)</literal> in the output. Apart
109 from this, the Glibc test suite is always expected to pass. However, in certain
110 circumstances, some failures are unavoidable. If a test fails because of a missing
111 program (or missing symbolic link), or a segfault, you will see an error code
112 greater than 127 and the details will be in the log. More commonly, tests will
113 fail with <literal>Error 2</literal> - for these, the contents of the corresponding
114 <filename>.out</filename> file, e.g. <filename>posix/annexc.out</filename> may be
115 informative. Here is a list of the most common issues:</para>
[3f8be484]116
117 <itemizedlist os="p">
118 <listitem>
[3514708]119 <para>The <emphasis>math</emphasis> tests sometimes fail.
120 Certain optimization settings are known to be a
121 factor here.</para>
[3f8be484]122 </listitem>
123 <listitem>
[fb40919]124 <para>If you have mounted the CLFS partition with the
[3f8be484]125 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
126 will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
127 do not use the <parameter>noatime</parameter> option while building
[fb40919]128 CLFS.</para>
[3f8be484]129 </listitem>
130 <listitem>
131 <para>When running on older and slower hardware, some tests
132 can fail because of test timeouts being exceeded.</para>
133 </listitem>
134 </itemizedlist>
135
136 <para os="q">Though it is a harmless message, the install stage of Glibc will
137 complain about the absence of <filename>/etc/ld.so.conf</filename>.
138 Prevent this warning with:</para>
139
140<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
141
142 <para os="s">Install the package:</para>
143
144<screen os="t"><userinput>make install</userinput></screen>
145
146 </sect2>
147
148 <sect2 id="i18n-glibc" role="configuration">
149 <title>Internationalization</title>
150
151 <para>The locales that can make the system respond in a different
[5a321cb]152 language were not installed by the above command. Install them
[3f8be484]153 with:</para>
154
155<screen><userinput>make localedata/install-locales</userinput></screen>
156
157 <para>To save time, an alternative to running the previous command (which
[643f8be]158 generates and installs every locale listed in the
159 glibc-&glibc-version;/localedata/SUPPORTED file) is to install only
[3f8be484]160 those locales that are wanted and needed. This can be achieved by using
161 the <command>localedef</command> command. Information on this command is
162 located in the <filename>INSTALL</filename> file in the Glibc source.
163 However, there are a number of locales that are essential in order for the
164 tests of future packages to pass, in particular, the
165 <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
166 instead of the <parameter>install-locales</parameter> target used above,
167 will install the minimum set of locales necessary for the tests to run
168 successfully:</para>
169
[3a3e135]170<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
[3f8be484]171localedef -i de_DE -f ISO-8859-1 de_DE
172localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
173localedef -i en_HK -f ISO-8859-1 en_HK
174localedef -i en_PH -f ISO-8859-1 en_PH
175localedef -i en_US -f ISO-8859-1 en_US
176localedef -i es_MX -f ISO-8859-1 es_MX
177localedef -i fa_IR -f UTF-8 fa_IR
178localedef -i fr_FR -f ISO-8859-1 fr_FR
179localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
180localedef -i it_IT -f ISO-8859-1 it_IT
181localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
182
183 <para>Some locales installed by the <command>make
184 localedata/install-locales</command> command above are not properly
[fb40919]185 supported by some applications that are in the CLFS and BLFS books. Because
[3f8be484]186 of the various problems that arise due to application programmers making
[fb40919]187 assumptions that break in such locales, CLFS should not be used in locales
[3f8be484]188 that utilize multibyte character sets (including UTF-8) or right-to-left
189 writing order. Numerous unofficial and unstable patches are required to
[fb40919]190 fix these problems, and it has been decided by the CLFS developers not to
[643f8be]191 support such complex locales at this time. This applies to the ja_JP and
192 fa_IR locales as well&mdash;they have been installed only for GCC and
193 Gettext tests to pass, and the <command>watch</command> program (part of
194 the Procps package) does not work properly in them. Various attempts to
195 circumvent these restrictions are documented in internationalization-related
196 hints.</para>
[3f8be484]197
198 </sect2>
199
200 <sect2 id="conf-glibc" role="configuration">
201 <title>Configuring Glibc</title>
202
203 <indexterm zone="conf-glibc">
204 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
205 </indexterm>
206
207 <indexterm zone="conf-glibc">
208 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
209 </indexterm>
210
211 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
212 because, although Glibc provides defaults when this file is missing or
213 corrupt, the Glibc defaults do not work well in a networked environment.
214 The time zone also needs to be configured.</para>
215
216 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
217 the following:</para>
218
219<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
220<literal># Begin /etc/nsswitch.conf
221
222passwd: files
223group: files
224shadow: files
225
226hosts: files dns
227networks: files
228
229protocols: files
230services: files
231ethers: files
232rpc: files
233
234# End /etc/nsswitch.conf</literal>
235EOF</userinput></screen>
236
237 <para>To determine the local time zone, run the following script:</para>
238
[0f3854e]239<screen role="nodump"><userinput>tzselect</userinput></screen>
[3f8be484]240
241 <para>After answering a few questions about the location, the script will
242 output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
243 <emphasis>Canada/Eastern</emphasis>). Then create the
244 <filename>/etc/localtime</filename> file by running:</para>
245
[94e6142]246<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
[3f8be484]247 /etc/localtime</userinput></screen>
248
249 <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
250 that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
251
252 <variablelist>
253 <title>The meaning of the cp option:</title>
254
255 <varlistentry>
256 <term><parameter>--remove-destination</parameter></term>
257 <listitem>
258 <para>This is needed to force removal of the already existing symbolic
259 link. The reason for copying the file instead of using a symlink is to
260 cover the situation where <filename class="directory">/usr</filename>
261 is on a separate partition. This could be important when booted into
262 single user mode.</para>
263 </listitem>
264 </varlistentry>
265 </variablelist>
266
267 </sect2>
268
269 <sect2 id="conf-ld" role="configuration">
[0b637f1]270 <title>Configuring The Dynamic Loader</title>
[3f8be484]271
272 <indexterm zone="conf-ld">
273 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
274 </indexterm>
275
276 <para>By default, the dynamic loader (<filename
277 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
278 <filename class="directory">/lib</filename> and <filename
279 class="directory">/usr/lib</filename> for dynamic libraries that are
280 needed by programs as they are run. However, if there are libraries in
281 directories other than <filename class="directory">/lib</filename> and
282 <filename class="directory">/usr/lib</filename>, these need to be
283 added to the <filename>/etc/ld.so.conf</filename> file in order
284 for the dynamic loader to find them. Two directories that are commonly
285 known to contain additional libraries are <filename
286 class="directory">/usr/local/lib</filename> and <filename
287 class="directory">/opt/lib</filename>, so add those directories to the
288 dynamic loader's search path.</para>
289
290 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
291 following:</para>
292
293<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
294<literal># Begin /etc/ld.so.conf
295
296/usr/local/lib
297/opt/lib
298
299# End /etc/ld.so.conf</literal>
300EOF</userinput></screen>
301
302 </sect2>
303
304 <sect2 id="contents-glibc" role="content">
305 <title>Contents of Glibc</title>
306
307 <segmentedlist>
308 <segtitle>Installed programs</segtitle>
309 <segtitle>Installed libraries</segtitle>
310
311 <seglistitem>
312 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
[1e91bbd]313 ldd, lddlibc4, locale, localedef, mtrace, nscd,
[3f8be484]314 pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
315 zdump, and zic</seg>
316 <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
317 libbsd-compat.a, libc.[a,so], libcrypt.[a,so], libdl.[a,so], libg.a,
318 libieee.a, libm.[a,so], libmcheck.a, libmemusage.so, libnsl.a,
319 libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
320 libnss_nis.so, libnss_nisplus.so, libpcprofile.so, libpthread.[a,so],
321 libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so, and
322 libutil.[a,so]</seg>
323 </seglistitem>
324 </segmentedlist>
325
326 <variablelist>
327 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
328 <?dbfo list-presentation="list"?>
329 <?dbhtml list-presentation="table"?>
330
331 <varlistentry id="catchsegv">
332 <term><command>catchsegv</command></term>
333 <listitem>
334 <para>Can be used to create a stack trace when a program
335 terminates with a segmentation fault</para>
336 <indexterm zone="ch-system-glibc catchsegv">
337 <primary sortas="b-catchsegv">catchsegv</primary>
338 </indexterm>
339 </listitem>
340 </varlistentry>
341
342 <varlistentry id="gencat">
343 <term><command>gencat</command></term>
344 <listitem>
345 <para>Generates message catalogues</para>
346 <indexterm zone="ch-system-glibc gencat">
347 <primary sortas="b-gencat">gencat</primary>
348 </indexterm>
349 </listitem>
350 </varlistentry>
351
352 <varlistentry id="getconf">
353 <term><command>getconf</command></term>
354 <listitem>
355 <para>Displays the system configuration values for file system specific
356 variables</para>
357 <indexterm zone="ch-system-glibc getconf">
358 <primary sortas="b-getconf">getconf</primary>
359 </indexterm>
360 </listitem>
361 </varlistentry>
362
363 <varlistentry id="getent">
364 <term><command>getent</command></term>
365 <listitem>
366 <para>Gets entries from an administrative database</para>
367 <indexterm zone="ch-system-glibc getent">
368 <primary sortas="b-getent">getent</primary>
369 </indexterm>
370 </listitem>
371 </varlistentry>
372
373 <varlistentry id="iconv">
374 <term><command>iconv</command></term>
375 <listitem>
376 <para>Performs character set conversion</para>
377 <indexterm zone="ch-system-glibc iconv">
378 <primary sortas="b-iconv">iconv</primary>
379 </indexterm>
380 </listitem>
381 </varlistentry>
382
383 <varlistentry id="iconvconfig">
384 <term><command>iconvconfig</command></term>
385 <listitem>
386 <para>Creates fastloading <command>iconv</command> module configuration
387 files</para>
388 <indexterm zone="ch-system-glibc iconvconfig">
389 <primary sortas="b-iconvconfig">iconvconfig</primary>
390 </indexterm>
391 </listitem>
392 </varlistentry>
393
394 <varlistentry id="ldconfig">
395 <term><command>ldconfig</command></term>
396 <listitem>
397 <para>Configures the dynamic linker runtime bindings</para>
398 <indexterm zone="ch-system-glibc ldconfig">
399 <primary sortas="b-ldconfig">ldconfig</primary>
400 </indexterm>
401 </listitem>
402 </varlistentry>
403
404 <varlistentry id="ldd">
405 <term><command>ldd</command></term>
406 <listitem>
407 <para>Reports which shared libraries are required
408 by each given program or shared library</para>
409 <indexterm zone="ch-system-glibc ldd">
410 <primary sortas="b-ldd">ldd</primary>
411 </indexterm>
412 </listitem>
413 </varlistentry>
414
415 <varlistentry id="lddlibc4">
416 <term><command>lddlibc4</command></term>
417 <listitem>
418 <para>Assists <command>ldd</command> with object files</para>
419 <indexterm zone="ch-system-glibc lddlibc4">
420 <primary sortas="b-lddlibc4">lddlibc4</primary>
421 </indexterm>
422 </listitem>
423 </varlistentry>
424
425 <varlistentry id="locale">
426 <term><command>locale</command></term>
427 <listitem>
428 <para>Tells the compiler to enable or disable the use of POSIX locales
429 for built-in operations</para>
430 <indexterm zone="ch-system-glibc locale">
431 <primary sortas="b-locale">locale</primary>
432 </indexterm>
433 </listitem>
434 </varlistentry>
435
436 <varlistentry id="localedef">
437 <term><command>localedef</command></term>
438 <listitem>
439 <para>Compiles locale specifications</para>
440 <indexterm zone="ch-system-glibc localedef">
441 <primary sortas="b-localedef">localedef</primary>
442 </indexterm>
443 </listitem>
444 </varlistentry>
445
446 <varlistentry id="mtrace">
447 <term><command>mtrace</command></term>
448 <listitem>
449 <para>Reads and interprets a memory trace file and
450 displays a summary in human-readable format</para>
451 <indexterm zone="ch-system-glibc mtrace">
452 <primary sortas="b-mtrace">mtrace</primary>
453 </indexterm>
454 </listitem>
455 </varlistentry>
456
457 <varlistentry id="nscd">
458 <term><command>nscd</command></term>
459 <listitem>
460 <para>A daemon that provides a cache for the most common name
461 service requests</para>
462 <indexterm zone="ch-system-glibc nscd">
463 <primary sortas="b-nscd">nscd</primary>
464 </indexterm>
465 </listitem>
466 </varlistentry>
467
468 <varlistentry id="pcprofiledump">
469 <term><command>pcprofiledump</command></term>
470 <listitem>
471 <para>Dumps information generated by PC profiling</para>
472 <indexterm zone="ch-system-glibc pcprofiledump">
473 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="pt_chown">
479 <term><command>pt_chown</command></term>
480 <listitem>
481 <para>A helper program for <command>grantpt</command> to set the owner,
482 group and access permissions of a slave pseudo terminal</para>
483 <indexterm zone="ch-system-glibc pt_chown">
484 <primary sortas="b-pt_chown">pt_chown</primary>
485 </indexterm>
486 </listitem>
487 </varlistentry>
488
489 <varlistentry id="rpcgen">
490 <term><command>rpcgen</command></term>
491 <listitem>
492 <para>Generates C code to implement the Remote Procecure Call (RPC)
493 protocol</para>
494 <indexterm zone="ch-system-glibc rpcgen">
495 <primary sortas="b-rpcgen">rpcgen</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="rpcinfo">
501 <term><command>rpcinfo</command></term>
502 <listitem>
503 <para>Makes an RPC call to an RPC server</para>
504 <indexterm zone="ch-system-glibc rpcinfo">
505 <primary sortas="b-rpcinfo">rpcinfo</primary>
506 </indexterm>
507 </listitem>
508 </varlistentry>
509
510 <varlistentry id="sln">
511 <term><command>sln</command></term>
512 <listitem>
[7087cbc]513 <para>A statically linked program that creates symbolic links</para>
[3f8be484]514 <indexterm zone="ch-system-glibc sln">
515 <primary sortas="b-sln">sln</primary>
516 </indexterm>
517 </listitem>
518 </varlistentry>
519
520 <varlistentry id="sprof">
521 <term><command>sprof</command></term>
522 <listitem>
523 <para>Reads and displays shared object profiling data</para>
524 <indexterm zone="ch-system-glibc sprof">
525 <primary sortas="b-sprof">sprof</primary>
526 </indexterm>
527 </listitem>
528 </varlistentry>
529
530 <varlistentry id="tzselect">
531 <term><command>tzselect</command></term>
532 <listitem>
533 <para>Asks the user about the location of the
534 system and reports the corresponding time zone description</para>
535 <indexterm zone="ch-system-glibc tzselect">
536 <primary sortas="b-tzselect">tzselect</primary>
537 </indexterm>
538 </listitem>
539 </varlistentry>
540
541 <varlistentry id="xtrace">
542 <term><command>xtrace</command></term>
543 <listitem>
544 <para>Traces the execution of a program by
545 printing the currently executed function</para>
546 <indexterm zone="ch-system-glibc xtrace">
547 <primary sortas="b-xtrace">xtrace</primary>
548 </indexterm>
549 </listitem>
550 </varlistentry>
551
552 <varlistentry id="zdump">
553 <term><command>zdump</command></term>
554 <listitem>
555 <para>The time zone dumper</para>
556 <indexterm zone="ch-system-glibc zdump">
557 <primary sortas="b-zdump">zdump</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="zic">
563 <term><command>zic</command></term>
564 <listitem>
565 <para>The time zone compiler</para>
566 <indexterm zone="ch-system-glibc zic">
567 <primary sortas="b-zic">zic</primary>
568 </indexterm>
569 </listitem>
570 </varlistentry>
571
572 <varlistentry id="ld.so">
573 <term><filename class="libraryfile">ld.so</filename></term>
574 <listitem>
575 <para>The helper program for shared library executables</para>
576 <indexterm zone="ch-system-glibc ld.so">
577 <primary sortas="c-ld.so">ld.so</primary>
578 </indexterm>
579 </listitem>
580 </varlistentry>
581
582 <varlistentry id="libBrokenLocale">
583 <term><filename class="libraryfile">libBrokenLocale</filename></term>
584 <listitem>
585 <para>Used by programs, such as Mozilla, to solve broken locales</para>
586 <indexterm zone="ch-system-glibc libBrokenLocale">
587 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
588 </indexterm>
589 </listitem>
590 </varlistentry>
591
592 <varlistentry id="libSegFault">
593 <term><filename class="libraryfile">libSegFault</filename></term>
594 <listitem>
595 <para>The segmentation fault signal handler</para>
596 <indexterm zone="ch-system-glibc libSegFault">
597 <primary sortas="c-libSegFault">libSegFault</primary>
598 </indexterm>
599 </listitem>
600 </varlistentry>
601
602 <varlistentry id="libanl">
603 <term><filename class="libraryfile">libanl</filename></term>
604 <listitem>
605 <para>An asynchronous name lookup library</para>
606 <indexterm zone="ch-system-glibc libanl">
607 <primary sortas="c-libanl">libanl</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611
612 <varlistentry id="libbsd-compat">
613 <term><filename class="libraryfile">libbsd-compat</filename></term>
614 <listitem>
615 <para>Provides the portability needed
616 in order to run certain Berkey Software Distribution (BSD) programs
617 under Linux</para>
618 <indexterm zone="ch-system-glibc libbsd-compat">
619 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
620 </indexterm>
621 </listitem>
622 </varlistentry>
623
624 <varlistentry id="libc">
625 <term><filename class="libraryfile">libc</filename></term>
626 <listitem>
627 <para>The main C library</para>
628 <indexterm zone="ch-system-glibc libc">
629 <primary sortas="c-libc">libc</primary>
630 </indexterm>
631 </listitem>
632 </varlistentry>
633
634 <varlistentry id="libcrypt">
635 <term><filename class="libraryfile">libcrypt</filename></term>
636 <listitem>
637 <para>The cryptography library</para>
638 <indexterm zone="ch-system-glibc libcrypt">
639 <primary sortas="c-libcrypt">libcrypt</primary>
640 </indexterm>
641 </listitem>
642 </varlistentry>
643
644 <varlistentry id="libdl">
645 <term><filename class="libraryfile">libdl</filename></term>
646 <listitem>
647 <para>The dynamic linking interface library</para>
648 <indexterm zone="ch-system-glibc libdl">
649 <primary sortas="c-libdl">libdl</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 <varlistentry id="libg">
655 <term><filename class="libraryfile">libg</filename></term>
656 <listitem>
657 <para>A runtime library for <command>g++</command></para>
658 <indexterm zone="ch-system-glibc libg">
659 <primary sortas="c-libg">libg</primary>
660 </indexterm>
661 </listitem>
662 </varlistentry>
663
664 <varlistentry id="libieee">
665 <term><filename class="libraryfile">libieee</filename></term>
666 <listitem>
667 <para>The Institute of Electrical and Electronic Engineers (IEEE)
668 floating point library</para>
669 <indexterm zone="ch-system-glibc libieee">
670 <primary sortas="c-libieee">libieee</primary>
671 </indexterm>
672 </listitem>
673 </varlistentry>
674
675 <varlistentry id="libm">
676 <term><filename class="libraryfile">libm</filename></term>
677 <listitem>
678 <para>The mathematical library</para>
679 <indexterm zone="ch-system-glibc libm">
680 <primary sortas="c-libm">libm</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="libmcheck">
686 <term><filename class="libraryfile">libmcheck</filename></term>
687 <listitem>
688 <para>Contains code run at boot</para>
689 <indexterm zone="ch-system-glibc libmcheck">
690 <primary sortas="c-libmcheck">libmcheck</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="libmemusage">
696 <term><filename class="libraryfile">libmemusage</filename></term>
697 <listitem>
[7087cbc]698 <para>Used by <command>memusage</command> (included in Glibc, but
699 not built in a base CLFS system as it has additional dependencies)
700 to help collect information about the memory usage of a program</para>
[3f8be484]701 <indexterm zone="ch-system-glibc libmemusage">
702 <primary sortas="c-libmemusage">libmemusage</primary>
703 </indexterm>
704 </listitem>
705 </varlistentry>
706
707 <varlistentry id="libnsl">
708 <term><filename class="libraryfile">libnsl</filename></term>
709 <listitem>
710 <para>The network services library</para>
711 <indexterm zone="ch-system-glibc libnsl">
712 <primary sortas="c-libnsl">libnsl</primary>
713 </indexterm>
714 </listitem>
715 </varlistentry>
716
717 <varlistentry id="libnss">
718 <term><filename class="libraryfile">libnss</filename></term>
719 <listitem>
720 <para>The Name Service Switch libraries, containing functions for
721 resolving host names, user names, group names, aliases, services,
722 protocols, etc.</para>
723 <indexterm zone="ch-system-glibc libnss">
724 <primary sortas="c-libnss">libnss</primary>
725 </indexterm>
726 </listitem>
727 </varlistentry>
728
729 <varlistentry id="libpcprofile">
730 <term><filename class="libraryfile">libpcprofile</filename></term>
731 <listitem>
732 <para>Contains profiling functions used to track the amount of CPU
733 time spent in specific source code lines</para>
734 <indexterm zone="ch-system-glibc libpcprofile">
735 <primary sortas="c-libpcprofile">libpcprofile</primary>
736 </indexterm>
737 </listitem>
738 </varlistentry>
739
740 <varlistentry id="libpthread">
741 <term><filename class="libraryfile">libpthread</filename></term>
742 <listitem>
743 <para>The POSIX threads library</para>
744 <indexterm zone="ch-system-glibc libpthread">
745 <primary sortas="c-libpthread">libpthread</primary>
746 </indexterm>
747 </listitem>
748 </varlistentry>
749
750 <varlistentry id="libresolv">
751 <term><filename class="libraryfile">libresolv</filename></term>
752 <listitem>
753 <para>Contains functions for creating, sending, and interpreting
754 packets to the Internet domain name servers</para>
755 <indexterm zone="ch-system-glibc libresolv">
756 <primary sortas="c-libresolv">libresolv</primary>
757 </indexterm>
758 </listitem>
759 </varlistentry>
760
761 <varlistentry id="librpcsvc">
762 <term><filename class="libraryfile">librpcsvc</filename></term>
763 <listitem>
764 <para>Contains functions providing miscellaneous RPC services</para>
765 <indexterm zone="ch-system-glibc librpcsvc">
766 <primary sortas="c-librpcsvc">librpcsvc</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="librt">
772 <term><filename class="libraryfile">librt</filename></term>
773 <listitem>
774 <para>Contains functions providing most of the interfaces specified by
775 the POSIX.1b Realtime Extension</para>
776 <indexterm zone="ch-system-glibc librt">
777 <primary sortas="c-librt">librt</primary>
778 </indexterm>
779 </listitem>
780 </varlistentry>
781
782 <varlistentry id="libthread_db">
783 <term><filename class="libraryfile">libthread_db</filename></term>
784 <listitem>
785 <para>Contains functions useful for
786 building debuggers for multi-threaded programs</para>
787 <indexterm zone="ch-system-glibc libthread_db">
788 <primary sortas="c-libthread_db">libthread_db</primary>
789 </indexterm>
790 </listitem>
791 </varlistentry>
792
793 <varlistentry id="libutil">
794 <term><filename class="libraryfile">libutil</filename></term>
795 <listitem>
796 <para>Contains code for <quote>standard</quote> functions used in
797 many different Unix utilities</para>
798 <indexterm zone="ch-system-glibc libutil">
799 <primary sortas="c-libutil">libutil</primary>
800 </indexterm>
801 </listitem>
802 </varlistentry>
803
804 </variablelist>
805
806 </sect2>
807
808</sect1>
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