source: BOOK/final-system/common/glibc.xml@ af8bcbc

clfs-1.2 clfs-2.1 clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since af8bcbc was 6aad380, checked in by Jim Gifford <clfs@…>, 19 years ago

r677@server (orig r675): manuel | 2005-11-10 03:13:57 -0800
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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 <segmentedlist>
26 <segtitle>&dependencies;</segtitle>
27
28 <seglistitem>
29 <seg>Bash, Binutils, Coreutils, Diffutils, Gawk, GCC, Gettext,
30 Grep, Make, Perl, Sed, and Texinfo</seg>
31 </seglistitem>
32 </segmentedlist>
33
34 </sect2>
35
36 <sect2 role="installation">
37 <title>Installation of Glibc</title>
38
39 <note os="z">
40 <para>Some packages outside of LFS suggest installing GNU libiconv in
41 order to translate data from one encoding to another. The project's
42 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
43 <quote>This library provides an <function>iconv()</function>
44 implementation, for use on systems which don't have one, or whose
45 implementation cannot convert from/to Unicode.</quote> Glibc provides
46 an <function>iconv()</function> implementation and can convert from/to
47 Unicode, therefore libiconv is not required on an LFS system.</para>
48 </note>
49
50 <para os="b">The Glibc build system is self-contained and will install
51 perfectly, even though the compiler specs file and linker are still
52 pointing at <filename class="directory">/tools</filename>. The specs
53 and linker cannot be adjusted before the Glibc install because the
54 Glibc autoconf tests would give false results and defeat the goal
55 of achieving a clean build.</para>
56
57 <para os="c">The following patch removed the potential of localdef
58 segfaulting:</para>
59
60<screen os="d"><userinput>patch -Np1 -i ../&glibc-localedef_segfault-patch;</userinput></screen>
[82f7fed]61
[3f8be484]62 <para os="e">The Glibc documentation recommends building Glibc outside of the
63 source directory in a dedicated build directory:</para>
64
65<screen os="f"><userinput>mkdir ../glibc-build
66cd ../glibc-build</userinput></screen>
67
68 <para os="g">Prepare Glibc for compilation:</para>
69
70<screen os="h"><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
71 --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
72 --libexecdir=/usr/lib/glibc</userinput></screen>
73
74 <variablelist os="i">
75 <title>The meaning of the new configure option:</title>
76
77 <varlistentry>
78 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
79 <listitem>
80 <para>This changes the location of the <command>pt_chown</command>
81 program from its default of <filename
82 class="directory">/usr/libexec</filename> to <filename
83 class="directory">/usr/lib/glibc</filename>.</para>
84 </listitem>
85 </varlistentry>
86 </variablelist>
87
88 <para os="j">Compile the package:</para>
89
90<screen os="k"><userinput>make</userinput></screen>
91
92 <important os="l">
93 <para>In this section, the test suite for Glibc is considered critical.
94 Do not skip it under any circumstance.</para>
95 </important>
96
97 <para os="m">Test the results:</para>
98
99<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
100
101<screen os="n"><userinput>make -k check &gt;glibc-check-log 2&gt;&amp;1 ; grep Error glibc-check-log</userinput></screen>
102
103 <para os="o">The Glibc test suite is highly dependent on certain functions of
104 the host system, in particular the kernel. In general, the Glibc test
105 suite is always expected to pass. However, in certain circumstances,
106 some failures are unavoidable. This is a list of the most common
107 issues:</para>
108
109 <itemizedlist os="p">
110 <listitem>
111 <para>The <emphasis>math</emphasis> tests, at least on i686, fail in
[da9f193]112 the <emphasis>test-double</emphasis> and <emphasis>test-idouble</emphasis>
113 tests with gcc-&gcc-version;, the <command>grep</command> command will
114 also report an expected (ignored) failure in <emphasis>posix/annexc
115 </emphasis>. These two failures in the math tests appear to be harmless.
116 The math tests may also fail on systems where the CPU is not a relatively
117 new genuine Intel or authentic AMD. Certain optimization settings are
118 also known to be a factor here.</para>
[3f8be484]119 </listitem>
120 <listitem>
121 <para>The <emphasis>gettext</emphasis> test sometimes fails due to
122 host system issues. The exact reasons are not yet clear.</para>
123 </listitem>
124 <listitem>
125 <para>If you have mounted the LFS partition with the
126 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
127 will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
128 do not use the <parameter>noatime</parameter> option while building
129 LFS.</para>
130 </listitem>
131 <listitem>
132 <para>When running on older and slower hardware, some tests
133 can fail because of test timeouts being exceeded.</para>
134 </listitem>
135 </itemizedlist>
136
137 <para os="q">Though it is a harmless message, the install stage of Glibc will
138 complain about the absence of <filename>/etc/ld.so.conf</filename>.
139 Prevent this warning with:</para>
140
141<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
142
143 <para os="s">Install the package:</para>
144
145<screen os="t"><userinput>make install</userinput></screen>
146
147 </sect2>
148
149 <sect2 id="i18n-glibc" role="configuration">
150 <title>Internationalization</title>
151
152 <para>The locales that can make the system respond in a different
153 language were not installed by the above command. Install this
154 with:</para>
155
156<screen><userinput>make localedata/install-locales</userinput></screen>
157
158 <para>To save time, an alternative to running the previous command (which
159 generates and installs every locale Glibc is aware of) is to install only
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
170<screen><userinput>mkdir -p /usr/lib/locale
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
185 supported by some applications that are in the LFS and BLFS books. Because
186 of the various problems that arise due to application programmers making
187 assumptions that break in such locales, LFS should not be used in locales
188 that utilize multibyte character sets (including UTF-8) or right-to-left
189 writing order. Numerous unofficial and unstable patches are required to
190 fix these problems, and it has been decided by the LFS developers not to
191 support such complex locales. This applies to the ja_JP and fa_IR locales
192 as well&mdash;they have been installed only for GCC and Gettext tests to
193 pass, and the <command>watch</command> program (part of the Procps package)
194 does not work properly in them. Various attempts to circumvent these
195 restrictions are documented in internationalization-related hints.</para>
196
197 </sect2>
198
199 <sect2 id="conf-glibc" role="configuration">
200 <title>Configuring Glibc</title>
201
202 <indexterm zone="conf-glibc">
203 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
204 </indexterm>
205
206 <indexterm zone="conf-glibc">
207 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
208 </indexterm>
209
210 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
211 because, although Glibc provides defaults when this file is missing or
212 corrupt, the Glibc defaults do not work well in a networked environment.
213 The time zone also needs to be configured.</para>
214
215 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
216 the following:</para>
217
218<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
219<literal># Begin /etc/nsswitch.conf
220
221passwd: files
222group: files
223shadow: files
224
225hosts: files dns
226networks: files
227
228protocols: files
229services: files
230ethers: files
231rpc: files
232
233# End /etc/nsswitch.conf</literal>
234EOF</userinput></screen>
235
236 <para>To determine the local time zone, run the following script:</para>
237
238<screen><userinput>tzselect</userinput></screen>
239
240 <para>After answering a few questions about the location, the script will
241 output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
242 <emphasis>Canada/Eastern</emphasis>). Then create the
243 <filename>/etc/localtime</filename> file by running:</para>
244
245<screen><userinput>cp --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
246 /etc/localtime</userinput></screen>
247
248 <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
249 that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
250
251 <variablelist>
252 <title>The meaning of the cp option:</title>
253
254 <varlistentry>
255 <term><parameter>--remove-destination</parameter></term>
256 <listitem>
257 <para>This is needed to force removal of the already existing symbolic
258 link. The reason for copying the file instead of using a symlink is to
259 cover the situation where <filename class="directory">/usr</filename>
260 is on a separate partition. This could be important when booted into
261 single user mode.</para>
262 </listitem>
263 </varlistentry>
264 </variablelist>
265
266 </sect2>
267
268 <sect2 id="conf-ld" role="configuration">
269 <title>Configuring Dynamic Loader</title>
270
271 <indexterm zone="conf-ld">
272 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
273 </indexterm>
274
275 <para>By default, the dynamic loader (<filename
276 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
277 <filename class="directory">/lib</filename> and <filename
278 class="directory">/usr/lib</filename> for dynamic libraries that are
279 needed by programs as they are run. However, if there are libraries in
280 directories other than <filename class="directory">/lib</filename> and
281 <filename class="directory">/usr/lib</filename>, these need to be
282 added to the <filename>/etc/ld.so.conf</filename> file in order
283 for the dynamic loader to find them. Two directories that are commonly
284 known to contain additional libraries are <filename
285 class="directory">/usr/local/lib</filename> and <filename
286 class="directory">/opt/lib</filename>, so add those directories to the
287 dynamic loader's search path.</para>
288
289 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
290 following:</para>
291
292<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
293<literal># Begin /etc/ld.so.conf
294
295/usr/local/lib
296/opt/lib
297
298# End /etc/ld.so.conf</literal>
299EOF</userinput></screen>
300
301 </sect2>
302
303 <sect2 id="contents-glibc" role="content">
304 <title>Contents of Glibc</title>
305
306 <segmentedlist>
307 <segtitle>Installed programs</segtitle>
308 <segtitle>Installed libraries</segtitle>
309
310 <seglistitem>
311 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
312 ldd, lddlibc4, locale, localedef, mtrace, nscd, nscd_nischeck,
313 pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
314 zdump, and zic</seg>
315 <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
316 libbsd-compat.a, libc.[a,so], libcrypt.[a,so], libdl.[a,so], libg.a,
317 libieee.a, libm.[a,so], libmcheck.a, libmemusage.so, libnsl.a,
318 libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
319 libnss_nis.so, libnss_nisplus.so, libpcprofile.so, libpthread.[a,so],
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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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-glibc nscd">
462 <primary sortas="b-nscd">nscd</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="nscd_nischeck">
468 <term><command>nscd_nischeck</command></term>
469 <listitem>
470 <para>Checks whether or not secure mode is necessary for NIS+
471 lookup</para>
472 <indexterm zone="ch-system-glibc nscd_nischeck">
473 <primary sortas="b-nscd_nischeck">nscd_nischeck</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="pcprofiledump">
479 <term><command>pcprofiledump</command></term>
480 <listitem>
481 <para>Dumps information generated by PC profiling</para>
482 <indexterm zone="ch-system-glibc pcprofiledump">
483 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
484 </indexterm>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry id="pt_chown">
489 <term><command>pt_chown</command></term>
490 <listitem>
491 <para>A helper program for <command>grantpt</command> to set the owner,
492 group and access permissions of a slave pseudo terminal</para>
493 <indexterm zone="ch-system-glibc pt_chown">
494 <primary sortas="b-pt_chown">pt_chown</primary>
495 </indexterm>
496 </listitem>
497 </varlistentry>
498
499 <varlistentry id="rpcgen">
500 <term><command>rpcgen</command></term>
501 <listitem>
502 <para>Generates C code to implement the Remote Procecure Call (RPC)
503 protocol</para>
504 <indexterm zone="ch-system-glibc rpcgen">
505 <primary sortas="b-rpcgen">rpcgen</primary>
506 </indexterm>
507 </listitem>
508 </varlistentry>
509
510 <varlistentry id="rpcinfo">
511 <term><command>rpcinfo</command></term>
512 <listitem>
513 <para>Makes an RPC call to an RPC server</para>
514 <indexterm zone="ch-system-glibc rpcinfo">
515 <primary sortas="b-rpcinfo">rpcinfo</primary>
516 </indexterm>
517 </listitem>
518 </varlistentry>
519
520 <varlistentry id="sln">
521 <term><command>sln</command></term>
522 <listitem>
523 <para>A statically linked <command>ln</command> program</para>
524 <indexterm zone="ch-system-glibc sln">
525 <primary sortas="b-sln">sln</primary>
526 </indexterm>
527 </listitem>
528 </varlistentry>
529
530 <varlistentry id="sprof">
531 <term><command>sprof</command></term>
532 <listitem>
533 <para>Reads and displays shared object profiling data</para>
534 <indexterm zone="ch-system-glibc sprof">
535 <primary sortas="b-sprof">sprof</primary>
536 </indexterm>
537 </listitem>
538 </varlistentry>
539
540 <varlistentry id="tzselect">
541 <term><command>tzselect</command></term>
542 <listitem>
543 <para>Asks the user about the location of the
544 system and reports the corresponding time zone description</para>
545 <indexterm zone="ch-system-glibc tzselect">
546 <primary sortas="b-tzselect">tzselect</primary>
547 </indexterm>
548 </listitem>
549 </varlistentry>
550
551 <varlistentry id="xtrace">
552 <term><command>xtrace</command></term>
553 <listitem>
554 <para>Traces the execution of a program by
555 printing the currently executed function</para>
556 <indexterm zone="ch-system-glibc xtrace">
557 <primary sortas="b-xtrace">xtrace</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="zdump">
563 <term><command>zdump</command></term>
564 <listitem>
565 <para>The time zone dumper</para>
566 <indexterm zone="ch-system-glibc zdump">
567 <primary sortas="b-zdump">zdump</primary>
568 </indexterm>
569 </listitem>
570 </varlistentry>
571
572 <varlistentry id="zic">
573 <term><command>zic</command></term>
574 <listitem>
575 <para>The time zone compiler</para>
576 <indexterm zone="ch-system-glibc zic">
577 <primary sortas="b-zic">zic</primary>
578 </indexterm>
579 </listitem>
580 </varlistentry>
581
582 <varlistentry id="ld.so">
583 <term><filename class="libraryfile">ld.so</filename></term>
584 <listitem>
585 <para>The helper program for shared library executables</para>
586 <indexterm zone="ch-system-glibc ld.so">
587 <primary sortas="c-ld.so">ld.so</primary>
588 </indexterm>
589 </listitem>
590 </varlistentry>
591
592 <varlistentry id="libBrokenLocale">
593 <term><filename class="libraryfile">libBrokenLocale</filename></term>
594 <listitem>
595 <para>Used by programs, such as Mozilla, to solve broken locales</para>
596 <indexterm zone="ch-system-glibc libBrokenLocale">
597 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
598 </indexterm>
599 </listitem>
600 </varlistentry>
601
602 <varlistentry id="libSegFault">
603 <term><filename class="libraryfile">libSegFault</filename></term>
604 <listitem>
605 <para>The segmentation fault signal handler</para>
606 <indexterm zone="ch-system-glibc libSegFault">
607 <primary sortas="c-libSegFault">libSegFault</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611
612 <varlistentry id="libanl">
613 <term><filename class="libraryfile">libanl</filename></term>
614 <listitem>
615 <para>An asynchronous name lookup library</para>
616 <indexterm zone="ch-system-glibc libanl">
617 <primary sortas="c-libanl">libanl</primary>
618 </indexterm>
619 </listitem>
620 </varlistentry>
621
622 <varlistentry id="libbsd-compat">
623 <term><filename class="libraryfile">libbsd-compat</filename></term>
624 <listitem>
625 <para>Provides the portability needed
626 in order to run certain Berkey Software Distribution (BSD) programs
627 under Linux</para>
628 <indexterm zone="ch-system-glibc libbsd-compat">
629 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
630 </indexterm>
631 </listitem>
632 </varlistentry>
633
634 <varlistentry id="libc">
635 <term><filename class="libraryfile">libc</filename></term>
636 <listitem>
637 <para>The main C library</para>
638 <indexterm zone="ch-system-glibc libc">
639 <primary sortas="c-libc">libc</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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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-glibc 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> to help collect
709 information about the memory usage of a program</para>
710 <indexterm zone="ch-system-glibc libmemusage">
711 <primary sortas="c-libmemusage">libmemusage</primary>
712 </indexterm>
713 </listitem>
714 </varlistentry>
715
716 <varlistentry id="libnsl">
717 <term><filename class="libraryfile">libnsl</filename></term>
718 <listitem>
719 <para>The network services library</para>
720 <indexterm zone="ch-system-glibc libnsl">
721 <primary sortas="c-libnsl">libnsl</primary>
722 </indexterm>
723 </listitem>
724 </varlistentry>
725
726 <varlistentry id="libnss">
727 <term><filename class="libraryfile">libnss</filename></term>
728 <listitem>
729 <para>The Name Service Switch libraries, containing functions for
730 resolving host names, user names, group names, aliases, services,
731 protocols, etc.</para>
732 <indexterm zone="ch-system-glibc libnss">
733 <primary sortas="c-libnss">libnss</primary>
734 </indexterm>
735 </listitem>
736 </varlistentry>
737
738 <varlistentry id="libpcprofile">
739 <term><filename class="libraryfile">libpcprofile</filename></term>
740 <listitem>
741 <para>Contains profiling functions used to track the amount of CPU
742 time spent in specific source code lines</para>
743 <indexterm zone="ch-system-glibc libpcprofile">
744 <primary sortas="c-libpcprofile">libpcprofile</primary>
745 </indexterm>
746 </listitem>
747 </varlistentry>
748
749 <varlistentry id="libpthread">
750 <term><filename class="libraryfile">libpthread</filename></term>
751 <listitem>
752 <para>The POSIX threads library</para>
753 <indexterm zone="ch-system-glibc libpthread">
754 <primary sortas="c-libpthread">libpthread</primary>
755 </indexterm>
756 </listitem>
757 </varlistentry>
758
759 <varlistentry id="libresolv">
760 <term><filename class="libraryfile">libresolv</filename></term>
761 <listitem>
762 <para>Contains functions for creating, sending, and interpreting
763 packets to the Internet domain name servers</para>
764 <indexterm zone="ch-system-glibc libresolv">
765 <primary sortas="c-libresolv">libresolv</primary>
766 </indexterm>
767 </listitem>
768 </varlistentry>
769
770 <varlistentry id="librpcsvc">
771 <term><filename class="libraryfile">librpcsvc</filename></term>
772 <listitem>
773 <para>Contains functions providing miscellaneous RPC services</para>
774 <indexterm zone="ch-system-glibc librpcsvc">
775 <primary sortas="c-librpcsvc">librpcsvc</primary>
776 </indexterm>
777 </listitem>
778 </varlistentry>
779
780 <varlistentry id="librt">
781 <term><filename class="libraryfile">librt</filename></term>
782 <listitem>
783 <para>Contains functions providing most of the interfaces specified by
784 the POSIX.1b Realtime Extension</para>
785 <indexterm zone="ch-system-glibc librt">
786 <primary sortas="c-librt">librt</primary>
787 </indexterm>
788 </listitem>
789 </varlistentry>
790
791 <varlistentry id="libthread_db">
792 <term><filename class="libraryfile">libthread_db</filename></term>
793 <listitem>
794 <para>Contains functions useful for
795 building debuggers for multi-threaded programs</para>
796 <indexterm zone="ch-system-glibc libthread_db">
797 <primary sortas="c-libthread_db">libthread_db</primary>
798 </indexterm>
799 </listitem>
800 </varlistentry>
801
802 <varlistentry id="libutil">
803 <term><filename class="libraryfile">libutil</filename></term>
804 <listitem>
805 <para>Contains code for <quote>standard</quote> functions used in
806 many different Unix utilities</para>
807 <indexterm zone="ch-system-glibc libutil">
808 <primary sortas="c-libutil">libutil</primary>
809 </indexterm>
810 </listitem>
811 </varlistentry>
812
813 </variablelist>
814
815 </sect2>
816
817</sect1>
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