source: BOOK/final-system/common/glibc.xml@ 9f696aca

clfs-1.2 clfs-2.1 clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since 9f696aca was 3f8be484, checked in by Jim Gifford <clfs@…>, 19 years ago

r627@server (orig r625): jim | 2005-10-31 12:59:34 -0800
Import of Cross-LFS Book
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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 <!ENTITY % patches-entities SYSTEM "../../patches.ent">
6 %general-entities;
7 %patches-entities;
8]>
9
10<sect1 id="ch-system-glibc" role="wrap">
11 <?dbhtml filename="glibc.html"?>
12
13 <title>Glibc-&glibc-version;</title>
14
15 <indexterm zone="ch-system-glibc">
16 <primary sortas="a-Glibc">Glibc</primary>
17 </indexterm>
18
19 <sect2 role="package">
20 <title/>
21
22 <para>The Glibc package contains the main C library. This library provides
23 the basic routines for allocating memory, searching directories, opening and
24 closing files, reading and writing files, string handling, pattern matching,
25 arithmetic, and so on.</para>
26
27 <segmentedlist>
28 <segtitle>&buildtime;</segtitle>
29 <segtitle>&diskspace;</segtitle>
30
31 <seglistitem>
32 <seg>Not checked yet</seg>
33 <seg>Not checked yet</seg>
34 </seglistitem>
35 </segmentedlist>
36
37 <segmentedlist>
38 <segtitle>&dependencies;</segtitle>
39
40 <seglistitem>
41 <seg>Bash, Binutils, Coreutils, Diffutils, Gawk, GCC, Gettext,
42 Grep, Make, Perl, Sed, and Texinfo</seg>
43 </seglistitem>
44 </segmentedlist>
45
46 </sect2>
47
48 <sect2 role="installation">
49 <title>Installation of Glibc</title>
50
51 <note os="z">
52 <para>Some packages outside of LFS suggest installing GNU libiconv in
53 order to translate data from one encoding to another. The project's
54 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
55 <quote>This library provides an <function>iconv()</function>
56 implementation, for use on systems which don't have one, or whose
57 implementation cannot convert from/to Unicode.</quote> Glibc provides
58 an <function>iconv()</function> implementation and can convert from/to
59 Unicode, therefore libiconv is not required on an LFS system.</para>
60 </note>
61
62 <para os="a">This package is known to behave badly when you change its default
63 optimization flags (including the <option>-march</option> and
64 <option>-mcpu</option> options). Therefore, if you have defined any
65 environment variables that override default optimizations, such as CFLAGS
66 and CXXFLAGS, we recommend un-setting them when building Glibc.</para>
67
68 <para os="b">The Glibc build system is self-contained and will install
69 perfectly, even though the compiler specs file and linker are still
70 pointing at <filename class="directory">/tools</filename>. The specs
71 and linker cannot be adjusted before the Glibc install because the
72 Glibc autoconf tests would give false results and defeat the goal
73 of achieving a clean build.</para>
74
75 <para os="c">The following patch removed the potential of localdef
76 segfaulting:</para>
77
78<screen os="d"><userinput>patch -Np1 -i ../&glibc-localedef_segfault-patch;</userinput></screen>
79
80 <para os="e">The Glibc documentation recommends building Glibc outside of the
81 source directory in a dedicated build directory:</para>
82
83<screen os="f"><userinput>mkdir ../glibc-build
84cd ../glibc-build</userinput></screen>
85
86 <para os="g">Prepare Glibc for compilation:</para>
87
88<screen os="h"><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
89 --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
90 --libexecdir=/usr/lib/glibc</userinput></screen>
91
92 <variablelist os="i">
93 <title>The meaning of the new configure option:</title>
94
95 <varlistentry>
96 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
97 <listitem>
98 <para>This changes the location of the <command>pt_chown</command>
99 program from its default of <filename
100 class="directory">/usr/libexec</filename> to <filename
101 class="directory">/usr/lib/glibc</filename>.</para>
102 </listitem>
103 </varlistentry>
104 </variablelist>
105
106 <para os="j">Compile the package:</para>
107
108<screen os="k"><userinput>make</userinput></screen>
109
110 <important os="l">
111 <para>In this section, the test suite for Glibc is considered critical.
112 Do not skip it under any circumstance.</para>
113 </important>
114
115 <para os="m">Test the results:</para>
116
117<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
118
119<screen os="n"><userinput>make -k check &gt;glibc-check-log 2&gt;&amp;1 ; grep Error glibc-check-log</userinput></screen>
120
121 <para os="o">The Glibc test suite is highly dependent on certain functions of
122 the host system, in particular the kernel. In general, the Glibc test
123 suite is always expected to pass. However, in certain circumstances,
124 some failures are unavoidable. This is a list of the most common
125 issues:</para>
126
127 <itemizedlist os="p">
128 <listitem>
129 <para>The <emphasis>math</emphasis> tests, at least on i686, fail in
130 the <emphasis>test-double</emphasis> and <emphasis>test-idouble</emphasis>
131 tests with gcc-&gcc-version;, the <command>grep</command> command will
132 also report an expected (ignored) failure in <emphasis>posix/annexc
133 </emphasis>. These two failures in the math tests appear to be harmless.
134 The math tests may also fail
135 on systems where the CPU is not a relatively new genuine Intel or
136 authentic AMD. Certain optimization settings are also known to be a
137 factor here.</para>
138 </listitem>
139 <listitem>
140 <para>The <emphasis>gettext</emphasis> test sometimes fails due to
141 host system issues. The exact reasons are not yet clear.</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> test
146 will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
147 do not use the <parameter>noatime</parameter> option while building
148 LFS.</para>
149 </listitem>
150 <listitem>
151 <para>When running on older and slower hardware, some tests
152 can fail because of test timeouts being exceeded.</para>
153 </listitem>
154 </itemizedlist>
155
156 <para os="q">Though it is a harmless message, the install stage of Glibc will
157 complain about the absence of <filename>/etc/ld.so.conf</filename>.
158 Prevent this warning with:</para>
159
160<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
161
162 <para os="s">Install the package:</para>
163
164<screen os="t"><userinput>make install</userinput></screen>
165
166 </sect2>
167
168 <sect2 id="i18n-glibc" role="configuration">
169 <title>Internationalization</title>
170
171 <para>The locales that can make the system respond in a different
172 language were not installed by the above command. Install this
173 with:</para>
174
175<screen><userinput>make localedata/install-locales</userinput></screen>
176
177 <para>To save time, an alternative to running the previous command (which
178 generates and installs every locale Glibc is aware of) is to install only
179 those locales that are wanted and needed. This can be achieved by using
180 the <command>localedef</command> command. Information on this command is
181 located in the <filename>INSTALL</filename> file in the Glibc source.
182 However, there are a number of locales that are essential in order for the
183 tests of future packages to pass, in particular, the
184 <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
185 instead of the <parameter>install-locales</parameter> target used above,
186 will install the minimum set of locales necessary for the tests to run
187 successfully:</para>
188
189<screen><userinput>mkdir -p /usr/lib/locale
190localedef -i de_DE -f ISO-8859-1 de_DE
191localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
192localedef -i en_HK -f ISO-8859-1 en_HK
193localedef -i en_PH -f ISO-8859-1 en_PH
194localedef -i en_US -f ISO-8859-1 en_US
195localedef -i es_MX -f ISO-8859-1 es_MX
196localedef -i fa_IR -f UTF-8 fa_IR
197localedef -i fr_FR -f ISO-8859-1 fr_FR
198localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
199localedef -i it_IT -f ISO-8859-1 it_IT
200localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
201
202 <para>Some locales installed by the <command>make
203 localedata/install-locales</command> command above are not properly
204 supported by some applications that are in the LFS and BLFS books. Because
205 of the various problems that arise due to application programmers making
206 assumptions that break in such locales, LFS should not be used in locales
207 that utilize multibyte character sets (including UTF-8) or right-to-left
208 writing order. Numerous unofficial and unstable patches are required to
209 fix these problems, and it has been decided by the LFS developers not to
210 support such complex locales. This applies to the ja_JP and fa_IR locales
211 as well&mdash;they have been installed only for GCC and Gettext tests to
212 pass, and the <command>watch</command> program (part of the Procps package)
213 does not work properly in them. Various attempts to circumvent these
214 restrictions are documented in internationalization-related hints.</para>
215
216 </sect2>
217
218 <sect2 id="conf-glibc" role="configuration">
219 <title>Configuring Glibc</title>
220
221 <indexterm zone="conf-glibc">
222 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
223 </indexterm>
224
225 <indexterm zone="conf-glibc">
226 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
227 </indexterm>
228
229 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
230 because, although Glibc provides defaults when this file is missing or
231 corrupt, the Glibc defaults do not work well in a networked environment.
232 The time zone also needs to be configured.</para>
233
234 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
235 the following:</para>
236
237<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
238<literal># Begin /etc/nsswitch.conf
239
240passwd: files
241group: files
242shadow: files
243
244hosts: files dns
245networks: files
246
247protocols: files
248services: files
249ethers: files
250rpc: files
251
252# End /etc/nsswitch.conf</literal>
253EOF</userinput></screen>
254
255 <para>To determine the local time zone, run the following script:</para>
256
257<screen><userinput>tzselect</userinput></screen>
258
259 <para>After answering a few questions about the location, the script will
260 output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
261 <emphasis>Canada/Eastern</emphasis>). Then create the
262 <filename>/etc/localtime</filename> file by running:</para>
263
264<screen><userinput>cp --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
265 /etc/localtime</userinput></screen>
266
267 <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
268 that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
269
270 <variablelist>
271 <title>The meaning of the cp option:</title>
272
273 <varlistentry>
274 <term><parameter>--remove-destination</parameter></term>
275 <listitem>
276 <para>This is needed to force removal of the already existing symbolic
277 link. The reason for copying the file instead of using a symlink is to
278 cover the situation where <filename class="directory">/usr</filename>
279 is on a separate partition. This could be important when booted into
280 single user mode.</para>
281 </listitem>
282 </varlistentry>
283 </variablelist>
284
285 </sect2>
286
287 <sect2 id="conf-ld" role="configuration">
288 <title>Configuring Dynamic Loader</title>
289
290 <indexterm zone="conf-ld">
291 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
292 </indexterm>
293
294 <para>By default, the dynamic loader (<filename
295 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
296 <filename class="directory">/lib</filename> and <filename
297 class="directory">/usr/lib</filename> for dynamic libraries that are
298 needed by programs as they are run. However, if there are libraries in
299 directories other than <filename class="directory">/lib</filename> and
300 <filename class="directory">/usr/lib</filename>, these need to be
301 added to the <filename>/etc/ld.so.conf</filename> file in order
302 for the dynamic loader to find them. Two directories that are commonly
303 known to contain additional libraries are <filename
304 class="directory">/usr/local/lib</filename> and <filename
305 class="directory">/opt/lib</filename>, so add those directories to the
306 dynamic loader's search path.</para>
307
308 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
309 following:</para>
310
311<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
312<literal># Begin /etc/ld.so.conf
313
314/usr/local/lib
315/opt/lib
316
317# End /etc/ld.so.conf</literal>
318EOF</userinput></screen>
319
320 </sect2>
321
322 <sect2 id="contents-glibc" role="content">
323 <title>Contents of Glibc</title>
324
325 <segmentedlist>
326 <segtitle>Installed programs</segtitle>
327 <segtitle>Installed libraries</segtitle>
328
329 <seglistitem>
330 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
331 ldd, lddlibc4, locale, localedef, mtrace, nscd, nscd_nischeck,
332 pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
333 zdump, and zic</seg>
334 <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
335 libbsd-compat.a, libc.[a,so], libcrypt.[a,so], libdl.[a,so], libg.a,
336 libieee.a, libm.[a,so], libmcheck.a, libmemusage.so, libnsl.a,
337 libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
338 libnss_nis.so, libnss_nisplus.so, libpcprofile.so, libpthread.[a,so],
339 libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so, and
340 libutil.[a,so]</seg>
341 </seglistitem>
342 </segmentedlist>
343
344 <variablelist>
345 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
346 <?dbfo list-presentation="list"?>
347 <?dbhtml list-presentation="table"?>
348
349 <varlistentry id="catchsegv">
350 <term><command>catchsegv</command></term>
351 <listitem>
352 <para>Can be used to create a stack trace when a program
353 terminates with a segmentation fault</para>
354 <indexterm zone="ch-system-glibc catchsegv">
355 <primary sortas="b-catchsegv">catchsegv</primary>
356 </indexterm>
357 </listitem>
358 </varlistentry>
359
360 <varlistentry id="gencat">
361 <term><command>gencat</command></term>
362 <listitem>
363 <para>Generates message catalogues</para>
364 <indexterm zone="ch-system-glibc gencat">
365 <primary sortas="b-gencat">gencat</primary>
366 </indexterm>
367 </listitem>
368 </varlistentry>
369
370 <varlistentry id="getconf">
371 <term><command>getconf</command></term>
372 <listitem>
373 <para>Displays the system configuration values for file system specific
374 variables</para>
375 <indexterm zone="ch-system-glibc getconf">
376 <primary sortas="b-getconf">getconf</primary>
377 </indexterm>
378 </listitem>
379 </varlistentry>
380
381 <varlistentry id="getent">
382 <term><command>getent</command></term>
383 <listitem>
384 <para>Gets entries from an administrative database</para>
385 <indexterm zone="ch-system-glibc getent">
386 <primary sortas="b-getent">getent</primary>
387 </indexterm>
388 </listitem>
389 </varlistentry>
390
391 <varlistentry id="iconv">
392 <term><command>iconv</command></term>
393 <listitem>
394 <para>Performs character set conversion</para>
395 <indexterm zone="ch-system-glibc iconv">
396 <primary sortas="b-iconv">iconv</primary>
397 </indexterm>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry id="iconvconfig">
402 <term><command>iconvconfig</command></term>
403 <listitem>
404 <para>Creates fastloading <command>iconv</command> module configuration
405 files</para>
406 <indexterm zone="ch-system-glibc iconvconfig">
407 <primary sortas="b-iconvconfig">iconvconfig</primary>
408 </indexterm>
409 </listitem>
410 </varlistentry>
411
412 <varlistentry id="ldconfig">
413 <term><command>ldconfig</command></term>
414 <listitem>
415 <para>Configures the dynamic linker runtime bindings</para>
416 <indexterm zone="ch-system-glibc ldconfig">
417 <primary sortas="b-ldconfig">ldconfig</primary>
418 </indexterm>
419 </listitem>
420 </varlistentry>
421
422 <varlistentry id="ldd">
423 <term><command>ldd</command></term>
424 <listitem>
425 <para>Reports which shared libraries are required
426 by each given program or shared library</para>
427 <indexterm zone="ch-system-glibc ldd">
428 <primary sortas="b-ldd">ldd</primary>
429 </indexterm>
430 </listitem>
431 </varlistentry>
432
433 <varlistentry id="lddlibc4">
434 <term><command>lddlibc4</command></term>
435 <listitem>
436 <para>Assists <command>ldd</command> with object files</para>
437 <indexterm zone="ch-system-glibc lddlibc4">
438 <primary sortas="b-lddlibc4">lddlibc4</primary>
439 </indexterm>
440 </listitem>
441 </varlistentry>
442
443 <varlistentry id="locale">
444 <term><command>locale</command></term>
445 <listitem>
446 <para>Tells the compiler to enable or disable the use of POSIX locales
447 for built-in operations</para>
448 <indexterm zone="ch-system-glibc locale">
449 <primary sortas="b-locale">locale</primary>
450 </indexterm>
451 </listitem>
452 </varlistentry>
453
454 <varlistentry id="localedef">
455 <term><command>localedef</command></term>
456 <listitem>
457 <para>Compiles locale specifications</para>
458 <indexterm zone="ch-system-glibc localedef">
459 <primary sortas="b-localedef">localedef</primary>
460 </indexterm>
461 </listitem>
462 </varlistentry>
463
464 <varlistentry id="mtrace">
465 <term><command>mtrace</command></term>
466 <listitem>
467 <para>Reads and interprets a memory trace file and
468 displays a summary in human-readable format</para>
469 <indexterm zone="ch-system-glibc mtrace">
470 <primary sortas="b-mtrace">mtrace</primary>
471 </indexterm>
472 </listitem>
473 </varlistentry>
474
475 <varlistentry id="nscd">
476 <term><command>nscd</command></term>
477 <listitem>
478 <para>A daemon that provides a cache for the most common name
479 service requests</para>
480 <indexterm zone="ch-system-glibc nscd">
481 <primary sortas="b-nscd">nscd</primary>
482 </indexterm>
483 </listitem>
484 </varlistentry>
485
486 <varlistentry id="nscd_nischeck">
487 <term><command>nscd_nischeck</command></term>
488 <listitem>
489 <para>Checks whether or not secure mode is necessary for NIS+
490 lookup</para>
491 <indexterm zone="ch-system-glibc nscd_nischeck">
492 <primary sortas="b-nscd_nischeck">nscd_nischeck</primary>
493 </indexterm>
494 </listitem>
495 </varlistentry>
496
497 <varlistentry id="pcprofiledump">
498 <term><command>pcprofiledump</command></term>
499 <listitem>
500 <para>Dumps information generated by PC profiling</para>
501 <indexterm zone="ch-system-glibc pcprofiledump">
502 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
503 </indexterm>
504 </listitem>
505 </varlistentry>
506
507 <varlistentry id="pt_chown">
508 <term><command>pt_chown</command></term>
509 <listitem>
510 <para>A helper program for <command>grantpt</command> to set the owner,
511 group and access permissions of a slave pseudo terminal</para>
512 <indexterm zone="ch-system-glibc pt_chown">
513 <primary sortas="b-pt_chown">pt_chown</primary>
514 </indexterm>
515 </listitem>
516 </varlistentry>
517
518 <varlistentry id="rpcgen">
519 <term><command>rpcgen</command></term>
520 <listitem>
521 <para>Generates C code to implement the Remote Procecure Call (RPC)
522 protocol</para>
523 <indexterm zone="ch-system-glibc rpcgen">
524 <primary sortas="b-rpcgen">rpcgen</primary>
525 </indexterm>
526 </listitem>
527 </varlistentry>
528
529 <varlistentry id="rpcinfo">
530 <term><command>rpcinfo</command></term>
531 <listitem>
532 <para>Makes an RPC call to an RPC server</para>
533 <indexterm zone="ch-system-glibc rpcinfo">
534 <primary sortas="b-rpcinfo">rpcinfo</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="sln">
540 <term><command>sln</command></term>
541 <listitem>
542 <para>A statically linked <command>ln</command> program</para>
543 <indexterm zone="ch-system-glibc sln">
544 <primary sortas="b-sln">sln</primary>
545 </indexterm>
546 </listitem>
547 </varlistentry>
548
549 <varlistentry id="sprof">
550 <term><command>sprof</command></term>
551 <listitem>
552 <para>Reads and displays shared object profiling data</para>
553 <indexterm zone="ch-system-glibc sprof">
554 <primary sortas="b-sprof">sprof</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="tzselect">
560 <term><command>tzselect</command></term>
561 <listitem>
562 <para>Asks the user about the location of the
563 system and reports the corresponding time zone description</para>
564 <indexterm zone="ch-system-glibc tzselect">
565 <primary sortas="b-tzselect">tzselect</primary>
566 </indexterm>
567 </listitem>
568 </varlistentry>
569
570 <varlistentry id="xtrace">
571 <term><command>xtrace</command></term>
572 <listitem>
573 <para>Traces the execution of a program by
574 printing the currently executed function</para>
575 <indexterm zone="ch-system-glibc xtrace">
576 <primary sortas="b-xtrace">xtrace</primary>
577 </indexterm>
578 </listitem>
579 </varlistentry>
580
581 <varlistentry id="zdump">
582 <term><command>zdump</command></term>
583 <listitem>
584 <para>The time zone dumper</para>
585 <indexterm zone="ch-system-glibc zdump">
586 <primary sortas="b-zdump">zdump</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="zic">
592 <term><command>zic</command></term>
593 <listitem>
594 <para>The time zone compiler</para>
595 <indexterm zone="ch-system-glibc zic">
596 <primary sortas="b-zic">zic</primary>
597 </indexterm>
598 </listitem>
599 </varlistentry>
600
601 <varlistentry id="ld.so">
602 <term><filename class="libraryfile">ld.so</filename></term>
603 <listitem>
604 <para>The helper program for shared library executables</para>
605 <indexterm zone="ch-system-glibc ld.so">
606 <primary sortas="c-ld.so">ld.so</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610
611 <varlistentry id="libBrokenLocale">
612 <term><filename class="libraryfile">libBrokenLocale</filename></term>
613 <listitem>
614 <para>Used by programs, such as Mozilla, to solve broken locales</para>
615 <indexterm zone="ch-system-glibc libBrokenLocale">
616 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
617 </indexterm>
618 </listitem>
619 </varlistentry>
620
621 <varlistentry id="libSegFault">
622 <term><filename class="libraryfile">libSegFault</filename></term>
623 <listitem>
624 <para>The segmentation fault signal handler</para>
625 <indexterm zone="ch-system-glibc libSegFault">
626 <primary sortas="c-libSegFault">libSegFault</primary>
627 </indexterm>
628 </listitem>
629 </varlistentry>
630
631 <varlistentry id="libanl">
632 <term><filename class="libraryfile">libanl</filename></term>
633 <listitem>
634 <para>An asynchronous name lookup library</para>
635 <indexterm zone="ch-system-glibc libanl">
636 <primary sortas="c-libanl">libanl</primary>
637 </indexterm>
638 </listitem>
639 </varlistentry>
640
641 <varlistentry id="libbsd-compat">
642 <term><filename class="libraryfile">libbsd-compat</filename></term>
643 <listitem>
644 <para>Provides the portability needed
645 in order to run certain Berkey Software Distribution (BSD) programs
646 under Linux</para>
647 <indexterm zone="ch-system-glibc libbsd-compat">
648 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="libc">
654 <term><filename class="libraryfile">libc</filename></term>
655 <listitem>
656 <para>The main C library</para>
657 <indexterm zone="ch-system-glibc libc">
658 <primary sortas="c-libc">libc</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="libcrypt">
664 <term><filename class="libraryfile">libcrypt</filename></term>
665 <listitem>
666 <para>The cryptography library</para>
667 <indexterm zone="ch-system-glibc libcrypt">
668 <primary sortas="c-libcrypt">libcrypt</primary>
669 </indexterm>
670 </listitem>
671 </varlistentry>
672
673 <varlistentry id="libdl">
674 <term><filename class="libraryfile">libdl</filename></term>
675 <listitem>
676 <para>The dynamic linking interface library</para>
677 <indexterm zone="ch-system-glibc libdl">
678 <primary sortas="c-libdl">libdl</primary>
679 </indexterm>
680 </listitem>
681 </varlistentry>
682
683 <varlistentry id="libg">
684 <term><filename class="libraryfile">libg</filename></term>
685 <listitem>
686 <para>A runtime library for <command>g++</command></para>
687 <indexterm zone="ch-system-glibc libg">
688 <primary sortas="c-libg">libg</primary>
689 </indexterm>
690 </listitem>
691 </varlistentry>
692
693 <varlistentry id="libieee">
694 <term><filename class="libraryfile">libieee</filename></term>
695 <listitem>
696 <para>The Institute of Electrical and Electronic Engineers (IEEE)
697 floating point library</para>
698 <indexterm zone="ch-system-glibc libieee">
699 <primary sortas="c-libieee">libieee</primary>
700 </indexterm>
701 </listitem>
702 </varlistentry>
703
704 <varlistentry id="libm">
705 <term><filename class="libraryfile">libm</filename></term>
706 <listitem>
707 <para>The mathematical library</para>
708 <indexterm zone="ch-system-glibc libm">
709 <primary sortas="c-libm">libm</primary>
710 </indexterm>
711 </listitem>
712 </varlistentry>
713
714 <varlistentry id="libmcheck">
715 <term><filename class="libraryfile">libmcheck</filename></term>
716 <listitem>
717 <para>Contains code run at boot</para>
718 <indexterm zone="ch-system-glibc libmcheck">
719 <primary sortas="c-libmcheck">libmcheck</primary>
720 </indexterm>
721 </listitem>
722 </varlistentry>
723
724 <varlistentry id="libmemusage">
725 <term><filename class="libraryfile">libmemusage</filename></term>
726 <listitem>
727 <para>Used by <command>memusage</command> to help collect
728 information about the memory usage of a program</para>
729 <indexterm zone="ch-system-glibc libmemusage">
730 <primary sortas="c-libmemusage">libmemusage</primary>
731 </indexterm>
732 </listitem>
733 </varlistentry>
734
735 <varlistentry id="libnsl">
736 <term><filename class="libraryfile">libnsl</filename></term>
737 <listitem>
738 <para>The network services library</para>
739 <indexterm zone="ch-system-glibc libnsl">
740 <primary sortas="c-libnsl">libnsl</primary>
741 </indexterm>
742 </listitem>
743 </varlistentry>
744
745 <varlistentry id="libnss">
746 <term><filename class="libraryfile">libnss</filename></term>
747 <listitem>
748 <para>The Name Service Switch libraries, containing functions for
749 resolving host names, user names, group names, aliases, services,
750 protocols, etc.</para>
751 <indexterm zone="ch-system-glibc libnss">
752 <primary sortas="c-libnss">libnss</primary>
753 </indexterm>
754 </listitem>
755 </varlistentry>
756
757 <varlistentry id="libpcprofile">
758 <term><filename class="libraryfile">libpcprofile</filename></term>
759 <listitem>
760 <para>Contains profiling functions used to track the amount of CPU
761 time spent in specific source code lines</para>
762 <indexterm zone="ch-system-glibc libpcprofile">
763 <primary sortas="c-libpcprofile">libpcprofile</primary>
764 </indexterm>
765 </listitem>
766 </varlistentry>
767
768 <varlistentry id="libpthread">
769 <term><filename class="libraryfile">libpthread</filename></term>
770 <listitem>
771 <para>The POSIX threads library</para>
772 <indexterm zone="ch-system-glibc libpthread">
773 <primary sortas="c-libpthread">libpthread</primary>
774 </indexterm>
775 </listitem>
776 </varlistentry>
777
778 <varlistentry id="libresolv">
779 <term><filename class="libraryfile">libresolv</filename></term>
780 <listitem>
781 <para>Contains functions for creating, sending, and interpreting
782 packets to the Internet domain name servers</para>
783 <indexterm zone="ch-system-glibc libresolv">
784 <primary sortas="c-libresolv">libresolv</primary>
785 </indexterm>
786 </listitem>
787 </varlistentry>
788
789 <varlistentry id="librpcsvc">
790 <term><filename class="libraryfile">librpcsvc</filename></term>
791 <listitem>
792 <para>Contains functions providing miscellaneous RPC services</para>
793 <indexterm zone="ch-system-glibc librpcsvc">
794 <primary sortas="c-librpcsvc">librpcsvc</primary>
795 </indexterm>
796 </listitem>
797 </varlistentry>
798
799 <varlistentry id="librt">
800 <term><filename class="libraryfile">librt</filename></term>
801 <listitem>
802 <para>Contains functions providing most of the interfaces specified by
803 the POSIX.1b Realtime Extension</para>
804 <indexterm zone="ch-system-glibc librt">
805 <primary sortas="c-librt">librt</primary>
806 </indexterm>
807 </listitem>
808 </varlistentry>
809
810 <varlistentry id="libthread_db">
811 <term><filename class="libraryfile">libthread_db</filename></term>
812 <listitem>
813 <para>Contains functions useful for
814 building debuggers for multi-threaded programs</para>
815 <indexterm zone="ch-system-glibc libthread_db">
816 <primary sortas="c-libthread_db">libthread_db</primary>
817 </indexterm>
818 </listitem>
819 </varlistentry>
820
821 <varlistentry id="libutil">
822 <term><filename class="libraryfile">libutil</filename></term>
823 <listitem>
824 <para>Contains code for <quote>standard</quote> functions used in
825 many different Unix utilities</para>
826 <indexterm zone="ch-system-glibc libutil">
827 <primary sortas="c-libutil">libutil</primary>
828 </indexterm>
829 </listitem>
830 </varlistentry>
831
832 </variablelist>
833
834 </sect2>
835
836</sect1>
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