source: BOOK/final-system/common/eglibc.xml@ 1bf0ff5

clfs-1.2 clfs-2.1 clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since 1bf0ff5 was 188b6b2, checked in by Chris Staub <chris@…>, 15 years ago

Updated lists of installed programs and libraries.
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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-eglibc" role="wrap">
9 <?dbhtml filename="eglibc.html"?>
10
11 <title>EGLIBC-&eglibc-version;</title>
12
13 <indexterm zone="ch-system-eglibc">
14 <primary sortas="a-EGLIBC">EGLIBC</primary>
15 </indexterm>
16
17 <sect2 role="package">
18 <title/>
19
20 <para>The EGLIBC 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 EGLIBC</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> EGLIBC 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="p1">EGLIBC has various issues addressed by the following patch:</para>
42
43<screen os="p2"><userinput>patch -Np1 -i ../&eglibc-fixes-patch;</userinput></screen>
44
45 <para os="l3">The following sed makes sure that newly built EGLIBC is tested,
46 during make install, instead of the one we previously build:</para>
47
48<screen os="l4"><userinput>LINKER=$(readelf -l $(file /tools/lib/libc-* | cut -f1 -d:) | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
49sed -i "s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=${LINKER} -o|" \
50 scripts/test-installation.pl
51unset LINKER</userinput></screen>
52
53 <para os="b">The EGLIBC build system is self-contained and will install
54 perfectly, even though the compiler specs file and linker are still
55 pointing at <filename class="directory">/tools</filename>. The specs
56 and linker cannot be adjusted before the EGLIBC install because the
57 EGLIBC Autoconf tests would give false results and defeat the goal
58 of achieving a clean build.</para>
59
60 <para os="e">The EGLIBC documentation recommends building EGLIBC outside of the
61 source directory in a dedicated build directory:</para>
62
63<screen os="f"><userinput>mkdir -v ../eglibc-build
64cd ../eglibc-build</userinput></screen>
65
66 <para os="g">Prepare EGLIBC for compilation:</para>
67
68<screen os="h"><userinput>../eglibc-&eglibc-version;/configure --prefix=/usr \
69 --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
70 --libexecdir=/usr/lib/eglibc</userinput></screen>
71
72 <variablelist os="i">
73 <title>The meaning of the new configure option:</title>
74
75 <varlistentry>
76 <term><parameter>--libexecdir=/usr/lib/eglibc</parameter></term>
77 <listitem>
78 <para>This changes the location of the <command>pt_chown</command>
79 program from its default of <filename
80 class="directory">/usr/libexec</filename> to <filename
81 class="directory">/usr/lib/eglibc</filename>.</para>
82 </listitem>
83 </varlistentry>
84 </variablelist>
85
86 <para os="j">Compile the package:</para>
87
88<screen os="k"><userinput>make</userinput></screen>
89
90 <important os="l">
91 <para>The test suite for EGLIBC is considered critical.
92 Do not skip it under any circumstance.</para>
93 </important>
94
95 <para os="m">Before running the tests, copy a file from the source tree into our
96 build tree to prevent a couple of test failures, then run the tests:</para>
97
98<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
99
100<screen os="n"><userinput>cp -v ../eglibc-&eglibc-version;/iconvdata/gconv-modules iconvdata
101make -k check &gt;eglibc-check-log 2&gt;&amp;1 ; grep Error eglibc-check-log</userinput></screen>
102
103 <para os="o">The EGLIBC test suite is highly dependent on certain functions of
104 the host system, in particular the kernel. The posix/annexc test normally fails
105 and you should see <literal>Error 1 (ignored)</literal> in the output. Apart
106 from this, the EGLIBC test suite is always expected to pass. However, in certain
107 circumstances, some failures are unavoidable. If a test fails because of a missing
108 program (or missing symbolic link), or a segfault, you will see an error code
109 greater than 127 and the details will be in the log. More commonly, tests will
110 fail with <literal>Error 2</literal> - for these, the contents of the corresponding
111 <filename>.out</filename> file, e.g. <filename>posix/annexc.out</filename> may be
112 informative. Here is a list of the most common issues:</para>
113
114 <itemizedlist os="p">
115 <listitem>
116 <para>The <emphasis>math</emphasis> tests sometimes fail.
117 Certain optimization settings are known to be a
118 factor here.</para>
119 </listitem>
120 <listitem>
121 <para>If you have mounted the CLFS partition with the
122 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
123 will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
124 do not use the <parameter>noatime</parameter> option while building
125 CLFS.</para>
126 </listitem>
127 <listitem>
128 <para>When running on older and slower hardware, some tests
129 can fail because of test timeouts being exceeded.</para>
130 </listitem>
131 </itemizedlist>
132
133 <para os="q">Though it is a harmless message, the install stage of EGLIBC will
134 complain about the absence of <filename>/etc/ld.so.conf</filename>.
135 Prevent this warning with:</para>
136
137<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
138
139 <para os="s">Install the package:</para>
140
141<screen os="t"><userinput>make install</userinput></screen>
142
143 </sect2>
144
145 <sect2 id="i18n-eglibc" role="configuration">
146 <title>Internationalization</title>
147
148 <para>The locales that can make the system respond in a different
149 language were not installed by the above command. Install them
150 with:</para>
151
152<screen><userinput>make localedata/install-locales</userinput></screen>
153
154 <para>To save time, an alternative to running the previous command (which
155 generates and installs every locale listed in the
156 eglibc-&eglibc-version;/localedata/SUPPORTED file) is to install only
157 those locales that are wanted and needed. This can be achieved by using
158 the <command>localedef</command> command. Information on this command is
159 located in the <filename>INSTALL</filename> file in the EGLIBC source.
160 However, there are a number of locales that are essential in order for the
161 tests of future packages to pass, in particular, the
162 <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
163 instead of the <parameter>install-locales</parameter> target used above,
164 will install the minimum set of locales necessary for the tests to run
165 successfully:</para>
166
167<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
168localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
169localedef -i de_DE -f ISO-8859-1 de_DE
170localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
171localedef -i en_HK -f ISO-8859-1 en_HK
172localedef -i en_PH -f ISO-8859-1 en_PH
173localedef -i en_US -f ISO-8859-1 en_US
174localedef -i es_MX -f ISO-8859-1 es_MX
175localedef -i fa_IR -f UTF-8 fa_IR
176localedef -i fr_FR -f ISO-8859-1 fr_FR
177localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
178localedef -i it_IT -f ISO-8859-1 it_IT
179localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
180
181 <para>Some locales installed by the <command>make
182 localedata/install-locales</command> command above are not properly
183 supported by some applications that are in CLFS and CBLFS. Because
184 of the various problems that arise due to application programmers making
185 assumptions that break in such locales, CLFS should not be used in locales
186 that utilize multibyte character sets (including UTF-8) or right-to-left
187 writing order. Numerous unofficial and unstable patches are required to
188 fix these problems, and it has been decided by the CLFS developers not to
189 support such complex locales at this time. This applies to the ja_JP and
190 fa_IR locales as well&mdash;they have been installed only for GCC and
191 Gettext tests to pass, and the <command>watch</command> program (part of
192 the Procps package) does not work properly in them. Various attempts to
193 circumvent these restrictions are documented in internationalization-related
194 hints.</para>
195
196 </sect2>
197
198 <sect2 id="conf-eglibc" role="configuration">
199 <title>Configuring EGLIBC</title>
200
201 <indexterm zone="conf-eglibc">
202 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
203 </indexterm>
204
205 <indexterm zone="conf-eglibc">
206 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
207 </indexterm>
208
209 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
210 because, although EGLIBC provides defaults when this file is missing or
211 corrupt, the EGLIBC defaults do not work well in a networked environment.
212 The time zone also needs to be configured.</para>
213
214 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
215 the following:</para>
216
217<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
218<literal># Begin /etc/nsswitch.conf
219
220passwd: files
221group: files
222shadow: files
223
224hosts: files dns
225networks: files
226
227protocols: files
228services: files
229ethers: files
230rpc: files
231
232# End /etc/nsswitch.conf</literal>
233EOF</userinput></screen>
234
235 <para>To determine the local time zone, run the following script:</para>
236
237<screen role="nodump"><userinput>tzselect</userinput></screen>
238
239 <para>After answering a few questions about the location, the script will
240 output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
241 <emphasis>Canada/Eastern</emphasis>). Then create the
242 <filename>/etc/localtime</filename> file by running:</para>
243
244<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
245 /etc/localtime</userinput></screen>
246
247 <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
248 that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
249
250 <variablelist>
251 <title>The meaning of the cp option:</title>
252
253 <varlistentry>
254 <term><parameter>--remove-destination</parameter></term>
255 <listitem>
256 <para>This is needed to force removal of the already existing symbolic
257 link. The reason for copying the file instead of using a symlink is to
258 cover the situation where <filename class="directory">/usr</filename>
259 is on a separate partition. This could be important when booted into
260 single user mode.</para>
261 </listitem>
262 </varlistentry>
263 </variablelist>
264
265 </sect2>
266
267 <sect2 id="conf-ld" role="configuration">
268 <title>Configuring The Dynamic Loader</title>
269
270 <indexterm zone="conf-ld">
271 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
272 </indexterm>
273
274 <para os="ld-a">By default, the dynamic loader (<filename
275 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
276 <filename class="directory">/lib</filename> and <filename
277 class="directory">/usr/lib</filename> for dynamic libraries that are
278 needed by programs as they are run. However, if there are libraries in
279 directories other than <filename class="directory">/lib</filename> and
280 <filename class="directory">/usr/lib</filename>, these need to be
281 added to the <filename>/etc/ld.so.conf</filename> file in order
282 for the dynamic loader to find them. Two directories that are commonly
283 known to contain additional libraries are <filename
284 class="directory">/usr/local/lib</filename> and <filename
285 class="directory">/opt/lib</filename>, so add those directories to the
286 dynamic loader's search path.</para>
287
288 <para os="ld-b">Create a new file <filename>/etc/ld.so.conf</filename> by running the
289 following:</para>
290
291<screen os="ld-c"><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
292<literal># Begin /etc/ld.so.conf
293
294/usr/local/lib
295/opt/lib
296
297# End /etc/ld.so.conf</literal>
298EOF</userinput></screen>
299
300 </sect2>
301
302 <sect2 id="contents-eglibc" role="content">
303 <title>Contents of EGLIBC</title>
304
305 <segmentedlist>
306 <segtitle>Installed programs</segtitle>
307 <segtitle>Installed libraries</segtitle>
308
309 <seglistitem>
310 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
311 ldd, lddlibc4, locale, localedef, mtrace, nscd,
312 pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
313 zdump, and zic</seg>
314 <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
315 libbsd-compat.a, libc.[a,so], libc_nonshared.a, libcidn.[a,so],
316 libcrypt.[a,so], libdl.[a,so], libg.a, libieee.a, libm.[a,so],
317 libmcheck.a, libmemusage.so, libnsl.a, libnss_compat.so, libnss_dns.so,
318 libnss_files.so, libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so,
319 libpcprofile.so, libpthread.[a,so], libpthread_nonshared.a,
320 libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so, and
321 libutil.[a,so]</seg>
322 </seglistitem>
323 </segmentedlist>
324
325 <variablelist>
326 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
327 <?dbfo list-presentation="list"?>
328 <?dbhtml list-presentation="table"?>
329
330 <varlistentry id="catchsegv">
331 <term><command>catchsegv</command></term>
332 <listitem>
333 <para>Can be used to create a stack trace when a program
334 terminates with a segmentation fault</para>
335 <indexterm zone="ch-system-eglibc catchsegv">
336 <primary sortas="b-catchsegv">catchsegv</primary>
337 </indexterm>
338 </listitem>
339 </varlistentry>
340
341 <varlistentry id="gencat">
342 <term><command>gencat</command></term>
343 <listitem>
344 <para>Generates message catalogues</para>
345 <indexterm zone="ch-system-eglibc gencat">
346 <primary sortas="b-gencat">gencat</primary>
347 </indexterm>
348 </listitem>
349 </varlistentry>
350
351 <varlistentry id="getconf">
352 <term><command>getconf</command></term>
353 <listitem>
354 <para>Displays the system configuration values for file system specific
355 variables</para>
356 <indexterm zone="ch-system-eglibc getconf">
357 <primary sortas="b-getconf">getconf</primary>
358 </indexterm>
359 </listitem>
360 </varlistentry>
361
362 <varlistentry id="getent">
363 <term><command>getent</command></term>
364 <listitem>
365 <para>Gets entries from an administrative database</para>
366 <indexterm zone="ch-system-eglibc getent">
367 <primary sortas="b-getent">getent</primary>
368 </indexterm>
369 </listitem>
370 </varlistentry>
371
372 <varlistentry id="iconv">
373 <term><command>iconv</command></term>
374 <listitem>
375 <para>Performs character set conversion</para>
376 <indexterm zone="ch-system-eglibc iconv">
377 <primary sortas="b-iconv">iconv</primary>
378 </indexterm>
379 </listitem>
380 </varlistentry>
381
382 <varlistentry id="iconvconfig">
383 <term><command>iconvconfig</command></term>
384 <listitem>
385 <para>Creates fastloading <command>iconv</command> module configuration
386 files</para>
387 <indexterm zone="ch-system-eglibc iconvconfig">
388 <primary sortas="b-iconvconfig">iconvconfig</primary>
389 </indexterm>
390 </listitem>
391 </varlistentry>
392
393 <varlistentry id="ldconfig">
394 <term><command>ldconfig</command></term>
395 <listitem>
396 <para>Configures the dynamic linker runtime bindings</para>
397 <indexterm zone="ch-system-eglibc ldconfig">
398 <primary sortas="b-ldconfig">ldconfig</primary>
399 </indexterm>
400 </listitem>
401 </varlistentry>
402
403 <varlistentry id="ldd">
404 <term><command>ldd</command></term>
405 <listitem>
406 <para>Reports which shared libraries are required
407 by each given program or shared library</para>
408 <indexterm zone="ch-system-eglibc ldd">
409 <primary sortas="b-ldd">ldd</primary>
410 </indexterm>
411 </listitem>
412 </varlistentry>
413
414 <varlistentry id="lddlibc4">
415 <term><command>lddlibc4</command></term>
416 <listitem>
417 <para>Assists <command>ldd</command> with object files</para>
418 <indexterm zone="ch-system-eglibc lddlibc4">
419 <primary sortas="b-lddlibc4">lddlibc4</primary>
420 </indexterm>
421 </listitem>
422 </varlistentry>
423
424 <varlistentry id="locale">
425 <term><command>locale</command></term>
426 <listitem>
427 <para>Tells the compiler to enable or disable the use of POSIX locales
428 for built-in operations</para>
429 <indexterm zone="ch-system-eglibc locale">
430 <primary sortas="b-locale">locale</primary>
431 </indexterm>
432 </listitem>
433 </varlistentry>
434
435 <varlistentry id="localedef">
436 <term><command>localedef</command></term>
437 <listitem>
438 <para>Compiles locale specifications</para>
439 <indexterm zone="ch-system-eglibc localedef">
440 <primary sortas="b-localedef">localedef</primary>
441 </indexterm>
442 </listitem>
443 </varlistentry>
444
445 <varlistentry id="mtrace">
446 <term><command>mtrace</command></term>
447 <listitem>
448 <para>Reads and interprets a memory trace file and
449 displays a summary in human-readable format</para>
450 <indexterm zone="ch-system-eglibc mtrace">
451 <primary sortas="b-mtrace">mtrace</primary>
452 </indexterm>
453 </listitem>
454 </varlistentry>
455
456 <varlistentry id="nscd">
457 <term><command>nscd</command></term>
458 <listitem>
459 <para>A daemon that provides a cache for the most common name
460 service requests</para>
461 <indexterm zone="ch-system-eglibc nscd">
462 <primary sortas="b-nscd">nscd</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="pcprofiledump">
468 <term><command>pcprofiledump</command></term>
469 <listitem>
470 <para>Dumps information generated by PC profiling</para>
471 <indexterm zone="ch-system-eglibc pcprofiledump">
472 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
473 </indexterm>
474 </listitem>
475 </varlistentry>
476
477 <varlistentry id="pt_chown">
478 <term><command>pt_chown</command></term>
479 <listitem>
480 <para>A helper program for <command>grantpt</command> to set the owner,
481 group and access permissions of a slave pseudo terminal</para>
482 <indexterm zone="ch-system-eglibc pt_chown">
483 <primary sortas="b-pt_chown">pt_chown</primary>
484 </indexterm>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry id="rpcgen">
489 <term><command>rpcgen</command></term>
490 <listitem>
491 <para>Generates C code to implement the Remote Procecure Call (RPC)
492 protocol</para>
493 <indexterm zone="ch-system-eglibc rpcgen">
494 <primary sortas="b-rpcgen">rpcgen</primary>
495 </indexterm>
496 </listitem>
497 </varlistentry>
498
499 <varlistentry id="rpcinfo">
500 <term><command>rpcinfo</command></term>
501 <listitem>
502 <para>Makes an RPC call to an RPC server</para>
503 <indexterm zone="ch-system-eglibc rpcinfo">
504 <primary sortas="b-rpcinfo">rpcinfo</primary>
505 </indexterm>
506 </listitem>
507 </varlistentry>
508
509 <varlistentry id="sln">
510 <term><command>sln</command></term>
511 <listitem>
512 <para>A statically linked program that creates symbolic links</para>
513 <indexterm zone="ch-system-eglibc sln">
514 <primary sortas="b-sln">sln</primary>
515 </indexterm>
516 </listitem>
517 </varlistentry>
518
519 <varlistentry id="sprof">
520 <term><command>sprof</command></term>
521 <listitem>
522 <para>Reads and displays shared object profiling data</para>
523 <indexterm zone="ch-system-eglibc sprof">
524 <primary sortas="b-sprof">sprof</primary>
525 </indexterm>
526 </listitem>
527 </varlistentry>
528
529 <varlistentry id="tzselect">
530 <term><command>tzselect</command></term>
531 <listitem>
532 <para>Asks the user about the location of the
533 system and reports the corresponding time zone description</para>
534 <indexterm zone="ch-system-eglibc tzselect">
535 <primary sortas="b-tzselect">tzselect</primary>
536 </indexterm>
537 </listitem>
538 </varlistentry>
539
540 <varlistentry id="xtrace">
541 <term><command>xtrace</command></term>
542 <listitem>
543 <para>Traces the execution of a program by
544 printing the currently executed function</para>
545 <indexterm zone="ch-system-eglibc xtrace">
546 <primary sortas="b-xtrace">xtrace</primary>
547 </indexterm>
548 </listitem>
549 </varlistentry>
550
551 <varlistentry id="zdump">
552 <term><command>zdump</command></term>
553 <listitem>
554 <para>The time zone dumper</para>
555 <indexterm zone="ch-system-eglibc zdump">
556 <primary sortas="b-zdump">zdump</primary>
557 </indexterm>
558 </listitem>
559 </varlistentry>
560
561 <varlistentry id="zic">
562 <term><command>zic</command></term>
563 <listitem>
564 <para>The time zone compiler</para>
565 <indexterm zone="ch-system-eglibc zic">
566 <primary sortas="b-zic">zic</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="ld.so">
572 <term><filename class="libraryfile">ld.so</filename></term>
573 <listitem>
574 <para>The helper program for shared library executables</para>
575 <indexterm zone="ch-system-eglibc ld.so">
576 <primary sortas="c-ld.so">ld.so</primary>
577 </indexterm>
578 </listitem>
579 </varlistentry>
580
581 <varlistentry id="libBrokenLocale">
582 <term><filename class="libraryfile">libBrokenLocale</filename></term>
583 <listitem>
584 <para>Used by programs, such as Mozilla, to solve broken locales</para>
585 <indexterm zone="ch-system-eglibc libBrokenLocale">
586 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="libSegFault">
592 <term><filename class="libraryfile">libSegFault</filename></term>
593 <listitem>
594 <para>The segmentation fault signal handler</para>
595 <indexterm zone="ch-system-eglibc libSegFault">
596 <primary sortas="c-libSegFault">libSegFault</primary>
597 </indexterm>
598 </listitem>
599 </varlistentry>
600
601 <varlistentry id="libanl">
602 <term><filename class="libraryfile">libanl</filename></term>
603 <listitem>
604 <para>An asynchronous name lookup library</para>
605 <indexterm zone="ch-system-eglibc libanl">
606 <primary sortas="c-libanl">libanl</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610
611 <varlistentry id="libbsd-compat">
612 <term><filename class="libraryfile">libbsd-compat</filename></term>
613 <listitem>
614 <para>Provides the portability needed
615 in order to run certain Berkey Software Distribution (BSD) programs
616 under Linux</para>
617 <indexterm zone="ch-system-eglibc libbsd-compat">
618 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <varlistentry id="libc">
624 <term><filename class="libraryfile">libc</filename></term>
625 <listitem>
626 <para>The main C library</para>
627 <indexterm zone="ch-system-eglibc libc">
628 <primary sortas="c-libc">libc</primary>
629 </indexterm>
630 </listitem>
631 </varlistentry>
632
633 <varlistentry id="libcidn">
634 <term><filename class="libraryfile">libcidn</filename></term>
635 <listitem>
636 <para>Used internally by EGLIBC for handling internationalized domain
637 names in the <function>getaddrinfo()</function> function</para>
638 <indexterm zone="ch-system-eglibc libcidn">
639 <primary sortas="c-libcidn">libcidn</primary>
640 </indexterm>
641 </listitem>
642 </varlistentry>
643
644 <varlistentry id="libcrypt">
645 <term><filename class="libraryfile">libcrypt</filename></term>
646 <listitem>
647 <para>The cryptography library</para>
648 <indexterm zone="ch-system-eglibc libcrypt">
649 <primary sortas="c-libcrypt">libcrypt</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 <varlistentry id="libdl">
655 <term><filename class="libraryfile">libdl</filename></term>
656 <listitem>
657 <para>The dynamic linking interface library</para>
658 <indexterm zone="ch-system-eglibc libdl">
659 <primary sortas="c-libdl">libdl</primary>
660 </indexterm>
661 </listitem>
662 </varlistentry>
663
664 <varlistentry id="libg">
665 <term><filename class="libraryfile">libg</filename></term>
666 <listitem>
667 <para>A runtime library for <command>g++</command></para>
668 <indexterm zone="ch-system-eglibc libg">
669 <primary sortas="c-libg">libg</primary>
670 </indexterm>
671 </listitem>
672 </varlistentry>
673
674 <varlistentry id="libieee">
675 <term><filename class="libraryfile">libieee</filename></term>
676 <listitem>
677 <para>The Institute of Electrical and Electronic Engineers (IEEE)
678 floating point library</para>
679 <indexterm zone="ch-system-eglibc libieee">
680 <primary sortas="c-libieee">libieee</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="libm">
686 <term><filename class="libraryfile">libm</filename></term>
687 <listitem>
688 <para>The mathematical library</para>
689 <indexterm zone="ch-system-eglibc libm">
690 <primary sortas="c-libm">libm</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="libmcheck">
696 <term><filename class="libraryfile">libmcheck</filename></term>
697 <listitem>
698 <para>Contains code run at boot</para>
699 <indexterm zone="ch-system-eglibc libmcheck">
700 <primary sortas="c-libmcheck">libmcheck</primary>
701 </indexterm>
702 </listitem>
703 </varlistentry>
704
705 <varlistentry id="libmemusage">
706 <term><filename class="libraryfile">libmemusage</filename></term>
707 <listitem>
708 <para>Used by <command>memusage</command> (included in EGLIBC, but
709 not built in a base CLFS system as it has additional dependencies)
710 to help collect information about the memory usage of a program</para>
711 <indexterm zone="ch-system-eglibc libmemusage">
712 <primary sortas="c-libmemusage">libmemusage</primary>
713 </indexterm>
714 </listitem>
715 </varlistentry>
716
717 <varlistentry id="libnsl">
718 <term><filename class="libraryfile">libnsl</filename></term>
719 <listitem>
720 <para>The network services library</para>
721 <indexterm zone="ch-system-eglibc libnsl">
722 <primary sortas="c-libnsl">libnsl</primary>
723 </indexterm>
724 </listitem>
725 </varlistentry>
726
727 <varlistentry id="libnss">
728 <term><filename class="libraryfile">libnss</filename></term>
729 <listitem>
730 <para>The Name Service Switch libraries, containing functions for
731 resolving host names, user names, group names, aliases, services,
732 protocols, etc.</para>
733 <indexterm zone="ch-system-eglibc libnss">
734 <primary sortas="c-libnss">libnss</primary>
735 </indexterm>
736 </listitem>
737 </varlistentry>
738
739 <varlistentry id="libpcprofile">
740 <term><filename class="libraryfile">libpcprofile</filename></term>
741 <listitem>
742 <para>Contains profiling functions used to track the amount of CPU
743 time spent in specific source code lines</para>
744 <indexterm zone="ch-system-eglibc libpcprofile">
745 <primary sortas="c-libpcprofile">libpcprofile</primary>
746 </indexterm>
747 </listitem>
748 </varlistentry>
749
750 <varlistentry id="libpthread">
751 <term><filename class="libraryfile">libpthread</filename></term>
752 <listitem>
753 <para>The POSIX threads library</para>
754 <indexterm zone="ch-system-eglibc libpthread">
755 <primary sortas="c-libpthread">libpthread</primary>
756 </indexterm>
757 </listitem>
758 </varlistentry>
759
760 <varlistentry id="libresolv">
761 <term><filename class="libraryfile">libresolv</filename></term>
762 <listitem>
763 <para>Contains functions for creating, sending, and interpreting
764 packets to the Internet domain name servers</para>
765 <indexterm zone="ch-system-eglibc libresolv">
766 <primary sortas="c-libresolv">libresolv</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="librpcsvc">
772 <term><filename class="libraryfile">librpcsvc</filename></term>
773 <listitem>
774 <para>Contains functions providing miscellaneous RPC services</para>
775 <indexterm zone="ch-system-eglibc librpcsvc">
776 <primary sortas="c-librpcsvc">librpcsvc</primary>
777 </indexterm>
778 </listitem>
779 </varlistentry>
780
781 <varlistentry id="librt">
782 <term><filename class="libraryfile">librt</filename></term>
783 <listitem>
784 <para>Contains functions providing most of the interfaces specified by
785 the POSIX.1b Realtime Extension</para>
786 <indexterm zone="ch-system-eglibc librt">
787 <primary sortas="c-librt">librt</primary>
788 </indexterm>
789 </listitem>
790 </varlistentry>
791
792 <varlistentry id="libthread_db">
793 <term><filename class="libraryfile">libthread_db</filename></term>
794 <listitem>
795 <para>Contains functions useful for
796 building debuggers for multi-threaded programs</para>
797 <indexterm zone="ch-system-eglibc libthread_db">
798 <primary sortas="c-libthread_db">libthread_db</primary>
799 </indexterm>
800 </listitem>
801 </varlistentry>
802
803 <varlistentry id="libutil">
804 <term><filename class="libraryfile">libutil</filename></term>
805 <listitem>
806 <para>Contains code for <quote>standard</quote> functions used in
807 many different Unix utilities</para>
808 <indexterm zone="ch-system-eglibc libutil">
809 <primary sortas="c-libutil">libutil</primary>
810 </indexterm>
811 </listitem>
812 </varlistentry>
813
814 </variablelist>
815
816 </sect2>
817
818</sect1>
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