source: BOOK/final-system/common/glibc.xml@ 65009ab2

clfs-1.2 clfs-2.1 clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since 65009ab2 was f1eafe24, checked in by Jim Gifford <clfs@…>, 18 years ago

Updated to Glibc 2.5

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