source: BOOK/final-system/common/glibc.xml@ 6ef644e

clfs-1.2 clfs-2.1 clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since 6ef644e was aa18ac0, checked in by Manuel Canales Esparcia <manuel@…>, 18 years ago

Updated trunk book sources to use DocBook-XML DTD 4.5.
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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 <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">
31 <para>Some packages outside of CLFS suggest installing GNU libiconv in
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
38 Unicode, therefore libiconv is not required on a CLFS system.</para>
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
45 Glibc Autoconf tests would give false results and defeat the goal
46 of achieving a clean build.</para>
47
48 <para os="c">The following patch fixes an issue that can
49 cause <command>localdef</command> to segfault:</para>
50
51<screen os="d"><userinput>patch -Np1 -i ../&glibc-localedef_segfault-patch;</userinput></screen>
52
53 <para os="p1">The following patch merges all updates from the &glibc-version; Branch from
54 the Glibc developers:</para>
55
56<screen os="p2"><userinput>patch -Np1 -i ../&glibc-branch_update-patch;</userinput></screen>
57
58 <para os="e">The Glibc documentation recommends building Glibc outside of the
59 source directory in a dedicated build directory:</para>
60
61<screen os="f"><userinput>mkdir -v ../glibc-build
62cd ../glibc-build</userinput></screen>
63
64 <para os="g">Prepare Glibc for compilation:</para>
65
66<screen os="h"><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
67 --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
68 --libexecdir=/usr/lib/glibc</userinput></screen>
69
70 <variablelist os="i">
71 <title>The meaning of the new configure option:</title>
72
73 <varlistentry>
74 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
75 <listitem>
76 <para>This changes the location of the <command>pt_chown</command>
77 program from its default of <filename
78 class="directory">/usr/libexec</filename> to <filename
79 class="directory">/usr/lib/glibc</filename>.</para>
80 </listitem>
81 </varlistentry>
82 </variablelist>
83
84 <para os="j">Compile the package:</para>
85
86<screen os="k"><userinput>make</userinput></screen>
87
88 <important os="l">
89 <para>The test suite for Glibc is considered critical.
90 Do not skip it under any circumstance.</para>
91 </important>
92
93 <para os="m">Test the results:</para>
94
95<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
96
97<screen os="n"><userinput>make -k check &gt;glibc-check-log 2&gt;&amp;1 ; grep Error glibc-check-log</userinput></screen>
98
99 <para os="o">The Glibc test suite is highly dependent on certain functions of
100 the host system, in particular the kernel. The posix/annexc test normally fails
101 and you should see <literal>Error 1 (ignored)</literal> in the output. Apart
102 from this, the Glibc test suite is always expected to pass. However, in certain
103 circumstances, some failures are unavoidable. If a test fails because of a missing
104 program (or missing symbolic link), or a segfault, you will see an error code
105 greater than 127 and the details will be in the log. More commonly, tests will
106 fail with <literal>Error 2</literal> - for these, the contents of the corresponding
107 <filename>.out</filename> file, e.g. <filename>posix/annexc.out</filename> may be
108 informative. Here is a list of the most common issues:</para>
109
110 <itemizedlist os="p">
111 <listitem>
112 <para>The <emphasis>math</emphasis> tests sometimes fail.
113 Certain optimization settings are known to be a
114 factor here.</para>
115 </listitem>
116 <listitem>
117 <para>If you have mounted the CLFS partition with the
118 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
119 will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
120 do not use the <parameter>noatime</parameter> option while building
121 CLFS.</para>
122 </listitem>
123 <listitem>
124 <para>When running on older and slower hardware, some tests
125 can fail because of test timeouts being exceeded.</para>
126 </listitem>
127 </itemizedlist>
128
129 <para os="q">Though it is a harmless message, the install stage of Glibc will
130 complain about the absence of <filename>/etc/ld.so.conf</filename>.
131 Prevent this warning with:</para>
132
133<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
134
135 <para os="s">Install the package:</para>
136
137<screen os="t"><userinput>make install</userinput></screen>
138
139 </sect2>
140
141 <sect2 id="i18n-glibc" role="configuration">
142 <title>Internationalization</title>
143
144 <para>The locales that can make the system respond in a different
145 language were not installed by the above command. Install them
146 with:</para>
147
148<screen><userinput>make localedata/install-locales</userinput></screen>
149
150 <para>To save time, an alternative to running the previous command (which
151 generates and installs every locale listed in the
152 glibc-&glibc-version;/localedata/SUPPORTED file) is to install only
153 those locales that are wanted and needed. This can be achieved by using
154 the <command>localedef</command> command. Information on this command is
155 located in the <filename>INSTALL</filename> file in the Glibc source.
156 However, there are a number of locales that are essential in order for the
157 tests of future packages to pass, in particular, the
158 <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
159 instead of the <parameter>install-locales</parameter> target used above,
160 will install the minimum set of locales necessary for the tests to run
161 successfully:</para>
162
163<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
164localedef -i de_DE -f ISO-8859-1 de_DE
165localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
166localedef -i en_HK -f ISO-8859-1 en_HK
167localedef -i en_PH -f ISO-8859-1 en_PH
168localedef -i en_US -f ISO-8859-1 en_US
169localedef -i es_MX -f ISO-8859-1 es_MX
170localedef -i fa_IR -f UTF-8 fa_IR
171localedef -i fr_FR -f ISO-8859-1 fr_FR
172localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
173localedef -i it_IT -f ISO-8859-1 it_IT
174localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
175
176 <para>Some locales installed by the <command>make
177 localedata/install-locales</command> command above are not properly
178 supported by some applications that are in the CLFS and BLFS books. Because
179 of the various problems that arise due to application programmers making
180 assumptions that break in such locales, CLFS should not be used in locales
181 that utilize multibyte character sets (including UTF-8) or right-to-left
182 writing order. Numerous unofficial and unstable patches are required to
183 fix these problems, and it has been decided by the CLFS developers not to
184 support such complex locales at this time. This applies to the ja_JP and
185 fa_IR locales as well&mdash;they have been installed only for GCC and
186 Gettext tests to pass, and the <command>watch</command> program (part of
187 the Procps package) does not work properly in them. Various attempts to
188 circumvent these restrictions are documented in internationalization-related
189 hints.</para>
190
191 </sect2>
192
193 <sect2 id="conf-glibc" role="configuration">
194 <title>Configuring Glibc</title>
195
196 <indexterm zone="conf-glibc">
197 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
198 </indexterm>
199
200 <indexterm zone="conf-glibc">
201 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
202 </indexterm>
203
204 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
205 because, although Glibc provides defaults when this file is missing or
206 corrupt, the Glibc defaults do not work well in a networked environment.
207 The time zone also needs to be configured.</para>
208
209 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
210 the following:</para>
211
212<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
213<literal># Begin /etc/nsswitch.conf
214
215passwd: files
216group: files
217shadow: files
218
219hosts: files dns
220networks: files
221
222protocols: files
223services: files
224ethers: files
225rpc: files
226
227# End /etc/nsswitch.conf</literal>
228EOF</userinput></screen>
229
230 <para>To determine the local time zone, run the following script:</para>
231
232<screen role="nodump"><userinput>tzselect</userinput></screen>
233
234 <para>After answering a few questions about the location, the script will
235 output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
236 <emphasis>Canada/Eastern</emphasis>). Then create the
237 <filename>/etc/localtime</filename> file by running:</para>
238
239<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
240 /etc/localtime</userinput></screen>
241
242 <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
243 that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
244
245 <variablelist>
246 <title>The meaning of the cp option:</title>
247
248 <varlistentry>
249 <term><parameter>--remove-destination</parameter></term>
250 <listitem>
251 <para>This is needed to force removal of the already existing symbolic
252 link. The reason for copying the file instead of using a symlink is to
253 cover the situation where <filename class="directory">/usr</filename>
254 is on a separate partition. This could be important when booted into
255 single user mode.</para>
256 </listitem>
257 </varlistentry>
258 </variablelist>
259
260 </sect2>
261
262 <sect2 id="conf-ld" role="configuration">
263 <title>Configuring The Dynamic Loader</title>
264
265 <indexterm zone="conf-ld">
266 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
267 </indexterm>
268
269 <para>By default, the dynamic loader (<filename
270 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
271 <filename class="directory">/lib</filename> and <filename
272 class="directory">/usr/lib</filename> for dynamic libraries that are
273 needed by programs as they are run. However, if there are libraries in
274 directories other than <filename class="directory">/lib</filename> and
275 <filename class="directory">/usr/lib</filename>, these need to be
276 added to the <filename>/etc/ld.so.conf</filename> file in order
277 for the dynamic loader to find them. Two directories that are commonly
278 known to contain additional libraries are <filename
279 class="directory">/usr/local/lib</filename> and <filename
280 class="directory">/opt/lib</filename>, so add those directories to the
281 dynamic loader's search path.</para>
282
283 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
284 following:</para>
285
286<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
287<literal># Begin /etc/ld.so.conf
288
289/usr/local/lib
290/opt/lib
291
292# End /etc/ld.so.conf</literal>
293EOF</userinput></screen>
294
295 </sect2>
296
297 <sect2 id="contents-glibc" role="content">
298 <title>Contents of Glibc</title>
299
300 <segmentedlist>
301 <segtitle>Installed programs</segtitle>
302 <segtitle>Installed libraries</segtitle>
303
304 <seglistitem>
305 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
306 ldd, lddlibc4, locale, localedef, mtrace, nscd,
307 pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
308 zdump, and zic</seg>
309 <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
310 libbsd-compat.a, libc.[a,so], libcrypt.[a,so], libdl.[a,so], libg.a,
311 libieee.a, libm.[a,so], libmcheck.a, libmemusage.so, libnsl.a,
312 libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
313 libnss_nis.so, libnss_nisplus.so, libpcprofile.so, libpthread.[a,so],
314 libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so, and
315 libutil.[a,so]</seg>
316 </seglistitem>
317 </segmentedlist>
318
319 <variablelist>
320 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
321 <?dbfo list-presentation="list"?>
322 <?dbhtml list-presentation="table"?>
323
324 <varlistentry id="catchsegv">
325 <term><command>catchsegv</command></term>
326 <listitem>
327 <para>Can be used to create a stack trace when a program
328 terminates with a segmentation fault</para>
329 <indexterm zone="ch-system-glibc catchsegv">
330 <primary sortas="b-catchsegv">catchsegv</primary>
331 </indexterm>
332 </listitem>
333 </varlistentry>
334
335 <varlistentry id="gencat">
336 <term><command>gencat</command></term>
337 <listitem>
338 <para>Generates message catalogues</para>
339 <indexterm zone="ch-system-glibc gencat">
340 <primary sortas="b-gencat">gencat</primary>
341 </indexterm>
342 </listitem>
343 </varlistentry>
344
345 <varlistentry id="getconf">
346 <term><command>getconf</command></term>
347 <listitem>
348 <para>Displays the system configuration values for file system specific
349 variables</para>
350 <indexterm zone="ch-system-glibc getconf">
351 <primary sortas="b-getconf">getconf</primary>
352 </indexterm>
353 </listitem>
354 </varlistentry>
355
356 <varlistentry id="getent">
357 <term><command>getent</command></term>
358 <listitem>
359 <para>Gets entries from an administrative database</para>
360 <indexterm zone="ch-system-glibc getent">
361 <primary sortas="b-getent">getent</primary>
362 </indexterm>
363 </listitem>
364 </varlistentry>
365
366 <varlistentry id="iconv">
367 <term><command>iconv</command></term>
368 <listitem>
369 <para>Performs character set conversion</para>
370 <indexterm zone="ch-system-glibc iconv">
371 <primary sortas="b-iconv">iconv</primary>
372 </indexterm>
373 </listitem>
374 </varlistentry>
375
376 <varlistentry id="iconvconfig">
377 <term><command>iconvconfig</command></term>
378 <listitem>
379 <para>Creates fastloading <command>iconv</command> module configuration
380 files</para>
381 <indexterm zone="ch-system-glibc iconvconfig">
382 <primary sortas="b-iconvconfig">iconvconfig</primary>
383 </indexterm>
384 </listitem>
385 </varlistentry>
386
387 <varlistentry id="ldconfig">
388 <term><command>ldconfig</command></term>
389 <listitem>
390 <para>Configures the dynamic linker runtime bindings</para>
391 <indexterm zone="ch-system-glibc ldconfig">
392 <primary sortas="b-ldconfig">ldconfig</primary>
393 </indexterm>
394 </listitem>
395 </varlistentry>
396
397 <varlistentry id="ldd">
398 <term><command>ldd</command></term>
399 <listitem>
400 <para>Reports which shared libraries are required
401 by each given program or shared library</para>
402 <indexterm zone="ch-system-glibc ldd">
403 <primary sortas="b-ldd">ldd</primary>
404 </indexterm>
405 </listitem>
406 </varlistentry>
407
408 <varlistentry id="lddlibc4">
409 <term><command>lddlibc4</command></term>
410 <listitem>
411 <para>Assists <command>ldd</command> with object files</para>
412 <indexterm zone="ch-system-glibc lddlibc4">
413 <primary sortas="b-lddlibc4">lddlibc4</primary>
414 </indexterm>
415 </listitem>
416 </varlistentry>
417
418 <varlistentry id="locale">
419 <term><command>locale</command></term>
420 <listitem>
421 <para>Tells the compiler to enable or disable the use of POSIX locales
422 for built-in operations</para>
423 <indexterm zone="ch-system-glibc locale">
424 <primary sortas="b-locale">locale</primary>
425 </indexterm>
426 </listitem>
427 </varlistentry>
428
429 <varlistentry id="localedef">
430 <term><command>localedef</command></term>
431 <listitem>
432 <para>Compiles locale specifications</para>
433 <indexterm zone="ch-system-glibc localedef">
434 <primary sortas="b-localedef">localedef</primary>
435 </indexterm>
436 </listitem>
437 </varlistentry>
438
439 <varlistentry id="mtrace">
440 <term><command>mtrace</command></term>
441 <listitem>
442 <para>Reads and interprets a memory trace file and
443 displays a summary in human-readable format</para>
444 <indexterm zone="ch-system-glibc mtrace">
445 <primary sortas="b-mtrace">mtrace</primary>
446 </indexterm>
447 </listitem>
448 </varlistentry>
449
450 <varlistentry id="nscd">
451 <term><command>nscd</command></term>
452 <listitem>
453 <para>A daemon that provides a cache for the most common name
454 service requests</para>
455 <indexterm zone="ch-system-glibc nscd">
456 <primary sortas="b-nscd">nscd</primary>
457 </indexterm>
458 </listitem>
459 </varlistentry>
460
461 <varlistentry id="pcprofiledump">
462 <term><command>pcprofiledump</command></term>
463 <listitem>
464 <para>Dumps information generated by PC profiling</para>
465 <indexterm zone="ch-system-glibc pcprofiledump">
466 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
467 </indexterm>
468 </listitem>
469 </varlistentry>
470
471 <varlistentry id="pt_chown">
472 <term><command>pt_chown</command></term>
473 <listitem>
474 <para>A helper program for <command>grantpt</command> to set the owner,
475 group and access permissions of a slave pseudo terminal</para>
476 <indexterm zone="ch-system-glibc pt_chown">
477 <primary sortas="b-pt_chown">pt_chown</primary>
478 </indexterm>
479 </listitem>
480 </varlistentry>
481
482 <varlistentry id="rpcgen">
483 <term><command>rpcgen</command></term>
484 <listitem>
485 <para>Generates C code to implement the Remote Procecure Call (RPC)
486 protocol</para>
487 <indexterm zone="ch-system-glibc rpcgen">
488 <primary sortas="b-rpcgen">rpcgen</primary>
489 </indexterm>
490 </listitem>
491 </varlistentry>
492
493 <varlistentry id="rpcinfo">
494 <term><command>rpcinfo</command></term>
495 <listitem>
496 <para>Makes an RPC call to an RPC server</para>
497 <indexterm zone="ch-system-glibc rpcinfo">
498 <primary sortas="b-rpcinfo">rpcinfo</primary>
499 </indexterm>
500 </listitem>
501 </varlistentry>
502
503 <varlistentry id="sln">
504 <term><command>sln</command></term>
505 <listitem>
506 <para>A statically linked program that creates symbolic links</para>
507 <indexterm zone="ch-system-glibc sln">
508 <primary sortas="b-sln">sln</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="sprof">
514 <term><command>sprof</command></term>
515 <listitem>
516 <para>Reads and displays shared object profiling data</para>
517 <indexterm zone="ch-system-glibc sprof">
518 <primary sortas="b-sprof">sprof</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="tzselect">
524 <term><command>tzselect</command></term>
525 <listitem>
526 <para>Asks the user about the location of the
527 system and reports the corresponding time zone description</para>
528 <indexterm zone="ch-system-glibc tzselect">
529 <primary sortas="b-tzselect">tzselect</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="xtrace">
535 <term><command>xtrace</command></term>
536 <listitem>
537 <para>Traces the execution of a program by
538 printing the currently executed function</para>
539 <indexterm zone="ch-system-glibc xtrace">
540 <primary sortas="b-xtrace">xtrace</primary>
541 </indexterm>
542 </listitem>
543 </varlistentry>
544
545 <varlistentry id="zdump">
546 <term><command>zdump</command></term>
547 <listitem>
548 <para>The time zone dumper</para>
549 <indexterm zone="ch-system-glibc zdump">
550 <primary sortas="b-zdump">zdump</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="zic">
556 <term><command>zic</command></term>
557 <listitem>
558 <para>The time zone compiler</para>
559 <indexterm zone="ch-system-glibc zic">
560 <primary sortas="b-zic">zic</primary>
561 </indexterm>
562 </listitem>
563 </varlistentry>
564
565 <varlistentry id="ld.so">
566 <term><filename class="libraryfile">ld.so</filename></term>
567 <listitem>
568 <para>The helper program for shared library executables</para>
569 <indexterm zone="ch-system-glibc ld.so">
570 <primary sortas="c-ld.so">ld.so</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="libBrokenLocale">
576 <term><filename class="libraryfile">libBrokenLocale</filename></term>
577 <listitem>
578 <para>Used by programs, such as Mozilla, to solve broken locales</para>
579 <indexterm zone="ch-system-glibc libBrokenLocale">
580 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="libSegFault">
586 <term><filename class="libraryfile">libSegFault</filename></term>
587 <listitem>
588 <para>The segmentation fault signal handler</para>
589 <indexterm zone="ch-system-glibc libSegFault">
590 <primary sortas="c-libSegFault">libSegFault</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594
595 <varlistentry id="libanl">
596 <term><filename class="libraryfile">libanl</filename></term>
597 <listitem>
598 <para>An asynchronous name lookup library</para>
599 <indexterm zone="ch-system-glibc libanl">
600 <primary sortas="c-libanl">libanl</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604
605 <varlistentry id="libbsd-compat">
606 <term><filename class="libraryfile">libbsd-compat</filename></term>
607 <listitem>
608 <para>Provides the portability needed
609 in order to run certain Berkey Software Distribution (BSD) programs
610 under Linux</para>
611 <indexterm zone="ch-system-glibc libbsd-compat">
612 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry>
616
617 <varlistentry id="libc">
618 <term><filename class="libraryfile">libc</filename></term>
619 <listitem>
620 <para>The main C library</para>
621 <indexterm zone="ch-system-glibc libc">
622 <primary sortas="c-libc">libc</primary>
623 </indexterm>
624 </listitem>
625 </varlistentry>
626
627 <varlistentry id="libcrypt">
628 <term><filename class="libraryfile">libcrypt</filename></term>
629 <listitem>
630 <para>The cryptography library</para>
631 <indexterm zone="ch-system-glibc libcrypt">
632 <primary sortas="c-libcrypt">libcrypt</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="libdl">
638 <term><filename class="libraryfile">libdl</filename></term>
639 <listitem>
640 <para>The dynamic linking interface library</para>
641 <indexterm zone="ch-system-glibc libdl">
642 <primary sortas="c-libdl">libdl</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="libg">
648 <term><filename class="libraryfile">libg</filename></term>
649 <listitem>
650 <para>A runtime library for <command>g++</command></para>
651 <indexterm zone="ch-system-glibc libg">
652 <primary sortas="c-libg">libg</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry>
656
657 <varlistentry id="libieee">
658 <term><filename class="libraryfile">libieee</filename></term>
659 <listitem>
660 <para>The Institute of Electrical and Electronic Engineers (IEEE)
661 floating point library</para>
662 <indexterm zone="ch-system-glibc libieee">
663 <primary sortas="c-libieee">libieee</primary>
664 </indexterm>
665 </listitem>
666 </varlistentry>
667
668 <varlistentry id="libm">
669 <term><filename class="libraryfile">libm</filename></term>
670 <listitem>
671 <para>The mathematical library</para>
672 <indexterm zone="ch-system-glibc libm">
673 <primary sortas="c-libm">libm</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="libmcheck">
679 <term><filename class="libraryfile">libmcheck</filename></term>
680 <listitem>
681 <para>Contains code run at boot</para>
682 <indexterm zone="ch-system-glibc libmcheck">
683 <primary sortas="c-libmcheck">libmcheck</primary>
684 </indexterm>
685 </listitem>
686 </varlistentry>
687
688 <varlistentry id="libmemusage">
689 <term><filename class="libraryfile">libmemusage</filename></term>
690 <listitem>
691 <para>Used by <command>memusage</command> (included in Glibc, but
692 not built in a base CLFS system as it has additional dependencies)
693 to help collect information about the memory usage of a program</para>
694 <indexterm zone="ch-system-glibc libmemusage">
695 <primary sortas="c-libmemusage">libmemusage</primary>
696 </indexterm>
697 </listitem>
698 </varlistentry>
699
700 <varlistentry id="libnsl">
701 <term><filename class="libraryfile">libnsl</filename></term>
702 <listitem>
703 <para>The network services library</para>
704 <indexterm zone="ch-system-glibc libnsl">
705 <primary sortas="c-libnsl">libnsl</primary>
706 </indexterm>
707 </listitem>
708 </varlistentry>
709
710 <varlistentry id="libnss">
711 <term><filename class="libraryfile">libnss</filename></term>
712 <listitem>
713 <para>The Name Service Switch libraries, containing functions for
714 resolving host names, user names, group names, aliases, services,
715 protocols, etc.</para>
716 <indexterm zone="ch-system-glibc libnss">
717 <primary sortas="c-libnss">libnss</primary>
718 </indexterm>
719 </listitem>
720 </varlistentry>
721
722 <varlistentry id="libpcprofile">
723 <term><filename class="libraryfile">libpcprofile</filename></term>
724 <listitem>
725 <para>Contains profiling functions used to track the amount of CPU
726 time spent in specific source code lines</para>
727 <indexterm zone="ch-system-glibc libpcprofile">
728 <primary sortas="c-libpcprofile">libpcprofile</primary>
729 </indexterm>
730 </listitem>
731 </varlistentry>
732
733 <varlistentry id="libpthread">
734 <term><filename class="libraryfile">libpthread</filename></term>
735 <listitem>
736 <para>The POSIX threads library</para>
737 <indexterm zone="ch-system-glibc libpthread">
738 <primary sortas="c-libpthread">libpthread</primary>
739 </indexterm>
740 </listitem>
741 </varlistentry>
742
743 <varlistentry id="libresolv">
744 <term><filename class="libraryfile">libresolv</filename></term>
745 <listitem>
746 <para>Contains functions for creating, sending, and interpreting
747 packets to the Internet domain name servers</para>
748 <indexterm zone="ch-system-glibc libresolv">
749 <primary sortas="c-libresolv">libresolv</primary>
750 </indexterm>
751 </listitem>
752 </varlistentry>
753
754 <varlistentry id="librpcsvc">
755 <term><filename class="libraryfile">librpcsvc</filename></term>
756 <listitem>
757 <para>Contains functions providing miscellaneous RPC services</para>
758 <indexterm zone="ch-system-glibc librpcsvc">
759 <primary sortas="c-librpcsvc">librpcsvc</primary>
760 </indexterm>
761 </listitem>
762 </varlistentry>
763
764 <varlistentry id="librt">
765 <term><filename class="libraryfile">librt</filename></term>
766 <listitem>
767 <para>Contains functions providing most of the interfaces specified by
768 the POSIX.1b Realtime Extension</para>
769 <indexterm zone="ch-system-glibc librt">
770 <primary sortas="c-librt">librt</primary>
771 </indexterm>
772 </listitem>
773 </varlistentry>
774
775 <varlistentry id="libthread_db">
776 <term><filename class="libraryfile">libthread_db</filename></term>
777 <listitem>
778 <para>Contains functions useful for
779 building debuggers for multi-threaded programs</para>
780 <indexterm zone="ch-system-glibc libthread_db">
781 <primary sortas="c-libthread_db">libthread_db</primary>
782 </indexterm>
783 </listitem>
784 </varlistentry>
785
786 <varlistentry id="libutil">
787 <term><filename class="libraryfile">libutil</filename></term>
788 <listitem>
789 <para>Contains code for <quote>standard</quote> functions used in
790 many different Unix utilities</para>
791 <indexterm zone="ch-system-glibc libutil">
792 <primary sortas="c-libutil">libutil</primary>
793 </indexterm>
794 </listitem>
795 </varlistentry>
796
797 </variablelist>
798
799 </sect2>
800
801</sect1>
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