source: chapter06/glibc.xml@ 164c802

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Last change on this file since 164c802 was bf91658, checked in by Matthew Burgess <matthew@…>, 18 years ago

Undo r7810. It obviously contained much more than the commit log stated.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@7811 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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File size: 31.2 KB
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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>&buildtime;</segtitle>
27 <segtitle>&diskspace;</segtitle>
28
29 <seglistitem>
30 <seg>&glibc-ch6-sbu;</seg>
31 <seg>&glibc-ch6-du;</seg>
32 </seglistitem>
33 </segmentedlist>
34
35 </sect2>
36
37 <sect2 role="installation">
38 <title>Installation of Glibc</title>
39
40 <note>
41 <para>Some packages outside of LFS suggest installing GNU libiconv in
42 order to translate data from one encoding to another. The project's
43 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
44 <quote>This library provides an <function>iconv()</function>
45 implementation, for use on systems which don't have one, or whose
46 implementation cannot convert from/to Unicode.</quote> Glibc provides
47 an <function>iconv()</function> implementation and can convert from/to
48 Unicode, therefore libiconv is not required on an LFS system.</para>
49 </note>
50
51 <para>The Glibc build system is self-contained and will install
52 perfectly, even though the compiler specs file and linker are still
53 pointing at <filename class="directory">/tools</filename>. The specs
54 and linker cannot be adjusted before the Glibc install because the
55 Glibc autoconf tests would give false results and defeat the goal
56 of achieving a clean build.</para>
57
58 <para>The glibc-libidn tarball adds support for internationalized domain
59 names (IDN) to Glibc. Many programs that support IDN require the full
60 <filename class="libraryfile">libidn</filename> library, not this add-on (see
61 <ulink url="&blfs-root;view/svn/general/libidn.html"/>).
62 Unpack the tarball from within the Glibc source directory:</para>
63
64<screen><userinput>tar -xf ../glibc-libidn-&glibc-version;.tar.bz2
65mv glibc-libidn-&glibc-version; libidn</userinput></screen>
66
67 <para>In the vi_VN.TCVN locale, <command>bash</command> enters an infinite loop
68 at startup. It is unknown whether this is a <command>bash</command> bug or a
69 Glibc problem. Disable installation of this locale in order to avoid the
70 problem:</para>
71
72<screen><userinput>sed -i '/vi_VN.TCVN/d' localedata/SUPPORTED</userinput></screen>
73
74 <para>When running <command>make install</command>, a script called
75 <filename>test-installation.pl</filename> performs a small sanity test on
76 our newly installed Glibc. However, because our toolchain still points to
77 the <filename class="directory">/tools</filename> directory, the sanity
78 test would be carried out against the wrong Glibc. We can force the script
79 to check the Glibc we have just installed with the following:</para>
80
81<screen><userinput>sed -i \
82's|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=/lib/ld-linux.so.2 -o|' \
83 scripts/test-installation.pl</userinput></screen>
84
85 <para>The Glibc documentation recommends building Glibc outside of the source
86 directory in a dedicated build directory:</para>
87
88<screen><userinput>mkdir -v ../glibc-build
89cd ../glibc-build</userinput></screen>
90
91 <para>Prepare Glibc for compilation:</para>
92
93<screen><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
94 --disable-profile --enable-add-ons \
95 --enable-kernel=2.6.0 --libexecdir=/usr/lib/glibc</userinput></screen>
96
97 <variablelist>
98 <title>The meaning of the new configure options:</title>
99
100 <varlistentry>
101 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
102 <listitem>
103 <para>This changes the location of the <command>pt_chown</command>
104 program from its default of <filename
105 class="directory">/usr/libexec</filename> to <filename
106 class="directory">/usr/lib/glibc</filename>.</para>
107 </listitem>
108 </varlistentry>
109
110 </variablelist>
111
112 <para>Compile the package:</para>
113
114<screen><userinput>make</userinput></screen>
115
116 <important>
117 <para>In this section, the test suite for Glibc is considered critical.
118 Do not skip it under any circumstance.</para>
119 </important>
120
121 <para>Test the results:</para>
122
123<screen><userinput>make -k check 2&gt;&amp;1 | tee glibc-check-log
124grep Error glibc-check-log</userinput></screen>
125
126 <para>You will probably see an expected (ignored) failure in the
127 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
128 is somewhat dependent on the host system. This is a list of the most
129 common issues:</para>
130
131 <itemizedlist>
132 <listitem>
133 <para>The <emphasis>nptl/tst-clock2</emphasis> and
134 <emphasis>tst-attr3</emphasis> tests sometimes
135 fail. The reason is not completely understood, but indications
136 are that a heavy system load can trigger these failures.</para>
137 </listitem>
138 <listitem>
139 <para>The math tests sometimes fail when running on
140 systems where the CPU is not a relatively new genuine Intel or
141 authentic AMD processor.</para>
142 </listitem>
143 <listitem>
144 <para>If you have mounted the LFS partition with the
145 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
146 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
147 use the <parameter>noatime</parameter> option while building LFS.</para>
148 </listitem>
149 <listitem>
150 <para>When running on older and slower hardware or on systems under
151 load, some tests can fail because of test timeouts being exceeded.</para>
152 </listitem>
153 </itemizedlist>
154
155 <para>Though it is a harmless message, the install stage of Glibc will
156 complain about the absence of <filename>/etc/ld.so.conf</filename>.
157 Prevent this warning with:</para>
158
159<screen><userinput>touch /etc/ld.so.conf</userinput></screen>
160
161 <para>Install the package:</para>
162
163<screen><userinput>make install</userinput></screen>
164
165 <para>The locales that can make the system respond in a different language
166 were not installed by the above command. None of the locales are required,
167 but if some of them are missing, testsuites of the future packages would
168 skip important testcases.</para>
169
170 <para>Individual locales can be installed using the
171 <command>localedef</command> program. E.g., the first
172 <command>localedef</command> command below combines the
173 <filename>/usr/share/i18n/locales/de_DE</filename>
174 charset-independent locale definition with the
175 <filename>/usr/share/i18n/charmaps/ISO-8859-1.gz</filename>
176 charmap definition and appends the result to the
177 <filename>/usr/lib/locale/locale-archive</filename> file.
178 The following instructions will install the minimum set of
179 locales necessary for the optimal coverage of tests:</para>
180
181<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
182localedef -i de_DE -f ISO-8859-1 de_DE
183localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
184localedef -i en_HK -f ISO-8859-1 en_HK
185localedef -i en_PH -f ISO-8859-1 en_PH
186localedef -i en_US -f ISO-8859-1 en_US
187localedef -i en_US -f UTF-8 en_US.UTF-8
188localedef -i es_MX -f ISO-8859-1 es_MX
189localedef -i fa_IR -f UTF-8 fa_IR
190localedef -i fr_FR -f ISO-8859-1 fr_FR
191localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
192localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
193localedef -i it_IT -f ISO-8859-1 it_IT
194localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
195
196 <para>In addition, install the locale for your own country, language and
197 character set.</para>
198
199 <para>Alternatively, install all locales listed in the
200 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
201 (it includes every locale listed above and many more) at once with the
202 following time-consuming command:</para>
203
204<screen><userinput>make localedata/install-locales</userinput></screen>
205
206 <para>Then use the <command>localedef</command> command to create and
207 install locales not listed in the
208 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
209 in the unlikely case if you need them.</para>
210 <!-- The Live CD patches the localedata/SUPPORTED file instead of
211 running localedef, the results are equivalent -->
212
213 </sect2>
214
215 <sect2 id="conf-glibc" role="configuration">
216 <title>Configuring Glibc</title>
217
218 <indexterm zone="conf-glibc">
219 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
220 </indexterm>
221
222 <indexterm zone="conf-glibc">
223 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
224 </indexterm>
225
226 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
227 because, although Glibc provides defaults when this file is missing or corrupt,
228 the Glibc defaults do not work well in a networked environment. The time zone
229 also needs to be configured.</para>
230
231 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
232 following:</para>
233
234<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
235<literal># Begin /etc/nsswitch.conf
236
237passwd: files
238group: files
239shadow: files
240
241hosts: files dns
242networks: files
243
244protocols: files
245services: files
246ethers: files
247rpc: files
248
249# End /etc/nsswitch.conf</literal>
250EOF</userinput></screen>
251
252 <para>One way to determine the local time zone, run the following
253 script:</para>
254
255<screen role="nodump"><userinput>tzselect</userinput></screen>
256
257 <para>After answering a few questions about the location, the script will
258 output the name of the time zone (e.g.,
259 <emphasis>America/Edmonton</emphasis>). There are also some other possible
260 timezones listed in <filename
261 class='directory'>/usr/share/zoneinfo</filename> such as
262 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
263 are not identified by the script but can be used.</para>
264
265 <para>Then create the <filename>/etc/localtime</filename> file by
266 running:</para>
267
268<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
269 /etc/localtime</userinput></screen>
270
271 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
272 time zone selected (e.g., Canada/Eastern).</para>
273
274 <variablelist>
275 <title>The meaning of the cp option:</title>
276
277 <varlistentry>
278 <term><parameter>--remove-destination</parameter></term>
279 <listitem>
280 <para>This is needed to force removal of the already existing symbolic
281 link. The reason for copying the file instead of using a symlink is to
282 cover the situation where <filename class="directory">/usr</filename>
283 is on a separate partition. This could be important when booted into
284 single user mode.</para>
285 </listitem>
286 </varlistentry>
287
288 </variablelist>
289
290 </sect2>
291
292 <sect2 id="conf-ld" role="configuration">
293 <title>Configuring the Dynamic Loader</title>
294
295 <indexterm zone="conf-ld">
296 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
297 </indexterm>
298
299 <para>By default, the dynamic loader (<filename
300 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
301 <filename class="directory">/lib</filename> and <filename
302 class="directory">/usr/lib</filename> for dynamic libraries that are
303 needed by programs as they are run. However, if there are libraries in
304 directories other than <filename class="directory">/lib</filename> and
305 <filename class="directory">/usr/lib</filename>, these need to be added
306 to the <filename>/etc/ld.so.conf</filename> file in order for the
307 dynamic loader to find them. Two directories that are commonly known
308 to contain additional libraries are <filename
309 class="directory">/usr/local/lib</filename> and <filename
310 class="directory">/opt/lib</filename>, so add those directories to the
311 dynamic loader's search path.</para>
312
313 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
314 following:</para>
315
316<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
317<literal># Begin /etc/ld.so.conf
318
319/usr/local/lib
320/opt/lib
321
322# End /etc/ld.so.conf</literal>
323EOF</userinput></screen>
324
325 </sect2>
326
327 <sect2 id="contents-glibc" role="content">
328 <title>Contents of Glibc</title>
329
330 <segmentedlist>
331 <segtitle>Installed programs</segtitle>
332 <segtitle>Installed libraries</segtitle>
333
334 <seglistitem>
335 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
336 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
337 pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
338 zdump, and zic</seg>
339 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
340 libbsd-compat.a, libc.{a,so}, libcidn.so, libcrypt.{a,so}, libdl.{a,so},
341 libg.a, libieee.a, libm.{a,so}, libmcheck.a, libmemusage.so, libnsl.a,
342 libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
343 libnss_nis.so, libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
344 libresolv.{a,so}, librpcsvc.a, librt.{a,so}, libthread_db.so, and
345 libutil.{a,so}</seg>
346 </seglistitem>
347 </segmentedlist>
348
349 <variablelist>
350 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
351 <?dbfo list-presentation="list"?>
352 <?dbhtml list-presentation="table"?>
353
354 <varlistentry id="catchsegv">
355 <term><command>catchsegv</command></term>
356 <listitem>
357 <para>Can be used to create a stack trace when a program
358 terminates with a segmentation fault</para>
359 <indexterm zone="ch-system-glibc catchsegv">
360 <primary sortas="b-catchsegv">catchsegv</primary>
361 </indexterm>
362 </listitem>
363 </varlistentry>
364
365 <varlistentry id="gencat">
366 <term><command>gencat</command></term>
367 <listitem>
368 <para>Generates message catalogues</para>
369 <indexterm zone="ch-system-glibc gencat">
370 <primary sortas="b-gencat">gencat</primary>
371 </indexterm>
372 </listitem>
373 </varlistentry>
374
375 <varlistentry id="getconf">
376 <term><command>getconf</command></term>
377 <listitem>
378 <para>Displays the system configuration values for file system
379 specific variables</para>
380 <indexterm zone="ch-system-glibc getconf">
381 <primary sortas="b-getconf">getconf</primary>
382 </indexterm>
383 </listitem>
384 </varlistentry>
385
386 <varlistentry id="getent">
387 <term><command>getent</command></term>
388 <listitem>
389 <para>Gets entries from an administrative database</para>
390 <indexterm zone="ch-system-glibc getent">
391 <primary sortas="b-getent">getent</primary>
392 </indexterm>
393 </listitem>
394 </varlistentry>
395
396 <varlistentry id="iconv">
397 <term><command>iconv</command></term>
398 <listitem>
399 <para>Performs character set conversion</para>
400 <indexterm zone="ch-system-glibc iconv">
401 <primary sortas="b-iconv">iconv</primary>
402 </indexterm>
403 </listitem>
404 </varlistentry>
405
406 <varlistentry id="iconvconfig">
407 <term><command>iconvconfig</command></term>
408 <listitem>
409 <para>Creates fastloading <command>iconv</command> module configuration
410 files</para>
411 <indexterm zone="ch-system-glibc iconvconfig">
412 <primary sortas="b-iconvconfig">iconvconfig</primary>
413 </indexterm>
414 </listitem>
415 </varlistentry>
416
417 <varlistentry id="ldconfig">
418 <term><command>ldconfig</command></term>
419 <listitem>
420 <para>Configures the dynamic linker runtime bindings</para>
421 <indexterm zone="ch-system-glibc ldconfig">
422 <primary sortas="b-ldconfig">ldconfig</primary>
423 </indexterm>
424 </listitem>
425 </varlistentry>
426
427 <varlistentry id="ldd">
428 <term><command>ldd</command></term>
429 <listitem>
430 <para>Reports which shared libraries are required
431 by each given program or shared library</para>
432 <indexterm zone="ch-system-glibc ldd">
433 <primary sortas="b-ldd">ldd</primary>
434 </indexterm>
435 </listitem>
436 </varlistentry>
437
438 <varlistentry id="lddlibc4">
439 <term><command>lddlibc4</command></term>
440 <listitem>
441 <para>Assists <command>ldd</command> with object files</para>
442 <indexterm zone="ch-system-glibc lddlibc4">
443 <primary sortas="b-lddlibc4">lddlibc4</primary>
444 </indexterm>
445 </listitem>
446 </varlistentry>
447
448 <varlistentry id="locale">
449 <term><command>locale</command></term>
450 <listitem>
451 <para>Prints various information about the current locale</para>
452 <indexterm zone="ch-system-glibc locale">
453 <primary sortas="b-locale">locale</primary>
454 </indexterm>
455 </listitem>
456 </varlistentry>
457
458 <varlistentry id="localedef">
459 <term><command>localedef</command></term>
460 <listitem>
461 <para>Compiles locale specifications</para>
462 <indexterm zone="ch-system-glibc localedef">
463 <primary sortas="b-localedef">localedef</primary>
464 </indexterm>
465 </listitem>
466 </varlistentry>
467
468 <varlistentry id="mtrace">
469 <term><command>mtrace</command></term>
470 <listitem>
471 <para>Reads and interprets a memory trace file and displays a summary
472 in human-readable format</para>
473 <indexterm zone="ch-system-glibc mtrace">
474 <primary sortas="b-mtrace">mtrace</primary>
475 </indexterm>
476 </listitem>
477 </varlistentry>
478
479 <varlistentry id="nscd">
480 <term><command>nscd</command></term>
481 <listitem>
482 <para>A daemon that provides a cache for the most common name
483 service requests</para>
484 <indexterm zone="ch-system-glibc nscd">
485 <primary sortas="b-nscd">nscd</primary>
486 </indexterm>
487 </listitem>
488 </varlistentry>
489
490 <varlistentry id="pcprofiledump">
491 <term><command>pcprofiledump</command></term>
492 <listitem>
493 <para>Dumps information generated by PC profiling</para>
494 <indexterm zone="ch-system-glibc pcprofiledump">
495 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="pt_chown">
501 <term><command>pt_chown</command></term>
502 <listitem>
503 <para>A helper program for <command>grantpt</command> to set the owner,
504 group and access permissions of a slave pseudo terminal</para>
505 <indexterm zone="ch-system-glibc pt_chown">
506 <primary sortas="b-pt_chown">pt_chown</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="rpcgen">
512 <term><command>rpcgen</command></term>
513 <listitem>
514 <para>Generates C code to implement the Remote Procecure Call (RPC)
515 protocol</para>
516 <indexterm zone="ch-system-glibc rpcgen">
517 <primary sortas="b-rpcgen">rpcgen</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="rpcinfo">
523 <term><command>rpcinfo</command></term>
524 <listitem>
525 <para>Makes an RPC call to an RPC server</para>
526 <indexterm zone="ch-system-glibc rpcinfo">
527 <primary sortas="b-rpcinfo">rpcinfo</primary>
528 </indexterm>
529 </listitem>
530 </varlistentry>
531
532 <varlistentry id="sln">
533 <term><command>sln</command></term>
534 <listitem>
535 <para>A statically linked <command>ln</command> program</para>
536 <indexterm zone="ch-system-glibc sln">
537 <primary sortas="b-sln">sln</primary>
538 </indexterm>
539 </listitem>
540 </varlistentry>
541
542 <varlistentry id="sprof">
543 <term><command>sprof</command></term>
544 <listitem>
545 <para>Reads and displays shared object profiling data</para>
546 <indexterm zone="ch-system-glibc sprof">
547 <primary sortas="b-sprof">sprof</primary>
548 </indexterm>
549 </listitem>
550 </varlistentry>
551
552 <varlistentry id="tzselect">
553 <term><command>tzselect</command></term>
554 <listitem>
555 <para>Asks the user about the location of the system and reports
556 the corresponding time zone description</para>
557 <indexterm zone="ch-system-glibc tzselect">
558 <primary sortas="b-tzselect">tzselect</primary>
559 </indexterm>
560 </listitem>
561 </varlistentry>
562
563 <varlistentry id="xtrace">
564 <term><command>xtrace</command></term>
565 <listitem>
566 <para>Traces the execution of a program by printing the currently
567 executed function</para>
568 <indexterm zone="ch-system-glibc xtrace">
569 <primary sortas="b-xtrace">xtrace</primary>
570 </indexterm>
571 </listitem>
572 </varlistentry>
573
574 <varlistentry id="zdump">
575 <term><command>zdump</command></term>
576 <listitem>
577 <para>The time zone dumper</para>
578 <indexterm zone="ch-system-glibc zdump">
579 <primary sortas="b-zdump">zdump</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="zic">
585 <term><command>zic</command></term>
586 <listitem>
587 <para>The time zone compiler</para>
588 <indexterm zone="ch-system-glibc zic">
589 <primary sortas="b-zic">zic</primary>
590 </indexterm>
591 </listitem>
592 </varlistentry>
593
594 <varlistentry id="ld.so">
595 <term><filename class="libraryfile">ld.so</filename></term>
596 <listitem>
597 <para>The helper program for shared library executables</para>
598 <indexterm zone="ch-system-glibc ld.so">
599 <primary sortas="c-ld.so">ld.so</primary>
600 </indexterm>
601 </listitem>
602 </varlistentry>
603
604 <varlistentry id="libBrokenLocale">
605 <term><filename class="libraryfile">libBrokenLocale</filename></term>
606 <listitem>
607 <para>Used internally by Glibc as a gross hack to get broken programs
608 (e.g., some Motif applications) running. See comments in
609 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
610 for more information</para>
611 <indexterm zone="ch-system-glibc libBrokenLocale">
612 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry>
616
617 <varlistentry id="libSegFault">
618 <term><filename class="libraryfile">libSegFault</filename></term>
619 <listitem>
620 <para>The segmentation fault signal handler, used by
621 <command>catchsegv</command></para>
622 <indexterm zone="ch-system-glibc libSegFault">
623 <primary sortas="c-libSegFault">libSegFault</primary>
624 </indexterm>
625 </listitem>
626 </varlistentry>
627
628 <varlistentry id="libanl">
629 <term><filename class="libraryfile">libanl</filename></term>
630 <listitem>
631 <para>An asynchronous name lookup library</para>
632 <indexterm zone="ch-system-glibc libanl">
633 <primary sortas="c-libanl">libanl</primary>
634 </indexterm>
635 </listitem>
636 </varlistentry>
637
638 <varlistentry id="libbsd-compat">
639 <term><filename class="libraryfile">libbsd-compat</filename></term>
640 <listitem>
641 <para>Provides the portability needed in order to run certain Berkey
642 Software Distribution (BSD) programs under Linux</para>
643 <indexterm zone="ch-system-glibc libbsd-compat">
644 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <varlistentry id="libc">
650 <term><filename class="libraryfile">libc</filename></term>
651 <listitem>
652 <para>The main C library</para>
653 <indexterm zone="ch-system-glibc libc">
654 <primary sortas="c-libc">libc</primary>
655 </indexterm>
656 </listitem>
657 </varlistentry>
658
659 <varlistentry id="libcidn">
660 <term><filename class="libraryfile">libcidn</filename></term>
661 <listitem>
662 <para>Used internally by Glibc for handling internationalized domain
663 names in the <function>getaddrinfo()</function> function</para>
664 <indexterm zone="ch-system-glibc libcrypt">
665 <primary sortas="c-libcrypt">libcrypt</primary>
666 </indexterm>
667 </listitem>
668 </varlistentry>
669
670 <varlistentry id="libcrypt">
671 <term><filename class="libraryfile">libcrypt</filename></term>
672 <listitem>
673 <para>The cryptography library</para>
674 <indexterm zone="ch-system-glibc libcrypt">
675 <primary sortas="c-libcrypt">libcrypt</primary>
676 </indexterm>
677 </listitem>
678 </varlistentry>
679
680 <varlistentry id="libdl">
681 <term><filename class="libraryfile">libdl</filename></term>
682 <listitem>
683 <para>The dynamic linking interface library</para>
684 <indexterm zone="ch-system-glibc libdl">
685 <primary sortas="c-libdl">libdl</primary>
686 </indexterm>
687 </listitem>
688 </varlistentry>
689
690 <varlistentry id="libg">
691 <term><filename class="libraryfile">libg</filename></term>
692 <listitem>
693 <para>Dummy library containing no functions. Previously was a runtime
694 library for <command>g++</command></para>
695 <indexterm zone="ch-system-glibc libg">
696 <primary sortas="c-libg">libg</primary>
697 </indexterm>
698 </listitem>
699 </varlistentry>
700
701 <varlistentry id="libieee">
702 <term><filename class="libraryfile">libieee</filename></term>
703 <listitem>
704 <para>Linking in this module forces error handling rules for math
705 functions as defined by the Institute of Electrical and Electronic
706 Engineers (IEEE). The default is POSIX.1 error handling</para>
707 <indexterm zone="ch-system-glibc libieee">
708 <primary sortas="c-libieee">libieee</primary>
709 </indexterm>
710 </listitem>
711 </varlistentry>
712
713 <varlistentry id="libm">
714 <term><filename class="libraryfile">libm</filename></term>
715 <listitem>
716 <para>The mathematical library</para>
717 <indexterm zone="ch-system-glibc libm">
718 <primary sortas="c-libm">libm</primary>
719 </indexterm>
720 </listitem>
721 </varlistentry>
722
723 <varlistentry id="libmcheck">
724 <term><filename class="libraryfile">libmcheck</filename></term>
725 <listitem>
726 <para>Turns on memory allocation checking when linked to</para>
727 <indexterm zone="ch-system-glibc libmcheck">
728 <primary sortas="c-libmcheck">libmcheck</primary>
729 </indexterm>
730 </listitem>
731 </varlistentry>
732
733 <varlistentry id="libmemusage">
734 <term><filename class="libraryfile">libmemusage</filename></term>
735 <listitem>
736 <para>Used by <command>memusage</command> to help collect
737 information about the memory usage of a program</para>
738 <indexterm zone="ch-system-glibc libmemusage">
739 <primary sortas="c-libmemusage">libmemusage</primary>
740 </indexterm>
741 </listitem>
742 </varlistentry>
743
744 <varlistentry id="libnsl">
745 <term><filename class="libraryfile">libnsl</filename></term>
746 <listitem>
747 <para>The network services library</para>
748 <indexterm zone="ch-system-glibc libnsl">
749 <primary sortas="c-libnsl">libnsl</primary>
750 </indexterm>
751 </listitem>
752 </varlistentry>
753
754 <varlistentry id="libnss">
755 <term><filename class="libraryfile">libnss</filename></term>
756 <listitem>
757 <para>The Name Service Switch libraries, containing functions for
758 resolving host names, user names, group names, aliases, services,
759 protocols, etc.</para>
760 <indexterm zone="ch-system-glibc libnss">
761 <primary sortas="c-libnss">libnss</primary>
762 </indexterm>
763 </listitem>
764 </varlistentry>
765
766 <varlistentry id="libpcprofile">
767 <term><filename class="libraryfile">libpcprofile</filename></term>
768 <listitem>
769 <para>Contains profiling functions used to track the amount of CPU
770 time spent in specific source code lines</para>
771 <indexterm zone="ch-system-glibc libpcprofile">
772 <primary sortas="c-libpcprofile">libpcprofile</primary>
773 </indexterm>
774 </listitem>
775 </varlistentry>
776
777 <varlistentry id="libpthread">
778 <term><filename class="libraryfile">libpthread</filename></term>
779 <listitem>
780 <para>The POSIX threads library</para>
781 <indexterm zone="ch-system-glibc libpthread">
782 <primary sortas="c-libpthread">libpthread</primary>
783 </indexterm>
784 </listitem>
785 </varlistentry>
786
787 <varlistentry id="libresolv">
788 <term><filename class="libraryfile">libresolv</filename></term>
789 <listitem>
790 <para>Contains functions for creating, sending, and interpreting
791 packets to the Internet domain name servers</para>
792 <indexterm zone="ch-system-glibc libresolv">
793 <primary sortas="c-libresolv">libresolv</primary>
794 </indexterm>
795 </listitem>
796 </varlistentry>
797
798 <varlistentry id="librpcsvc">
799 <term><filename class="libraryfile">librpcsvc</filename></term>
800 <listitem>
801 <para>Contains functions providing miscellaneous RPC services</para>
802 <indexterm zone="ch-system-glibc librpcsvc">
803 <primary sortas="c-librpcsvc">librpcsvc</primary>
804 </indexterm>
805 </listitem>
806 </varlistentry>
807
808 <varlistentry id="librt">
809 <term><filename class="libraryfile">librt</filename></term>
810 <listitem>
811 <para>Contains functions providing most of the interfaces specified
812 by the POSIX.1b Realtime Extension</para>
813 <indexterm zone="ch-system-glibc librt">
814 <primary sortas="c-librt">librt</primary>
815 </indexterm>
816 </listitem>
817 </varlistentry>
818
819 <varlistentry id="libthread_db">
820 <term><filename class="libraryfile">libthread_db</filename></term>
821 <listitem>
822 <para>Contains functions useful for building debuggers for
823 multi-threaded programs</para>
824 <indexterm zone="ch-system-glibc libthread_db">
825 <primary sortas="c-libthread_db">libthread_db</primary>
826 </indexterm>
827 </listitem>
828 </varlistentry>
829
830 <varlistentry id="libutil">
831 <term><filename class="libraryfile">libutil</filename></term>
832 <listitem>
833 <para>Contains code for <quote>standard</quote> functions used in
834 many different Unix utilities</para>
835 <indexterm zone="ch-system-glibc libutil">
836 <primary sortas="c-libutil">libutil</primary>
837 </indexterm>
838 </listitem>
839 </varlistentry>
840
841 </variablelist>
842
843 </sect2>
844
845</sect1>
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