source: BOOK/final-system/common/glibc.xml @ c93d889

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
Last change on this file since c93d889 was c93d889, checked in by Joe Ciccone <jciccone@…>, 17 years ago

Updated Glibc to 2.6.1.
  • Property mode set to 100644
File size: 29.6 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4  <!ENTITY % general-entities SYSTEM "../../general.ent">
5  %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9  <?dbhtml filename="glibc.html"?>
10
11  <title>Glibc-&glibc-version;</title>
12
13  <indexterm zone="ch-system-glibc">
14    <primary sortas="a-Glibc">Glibc</primary>
15  </indexterm>
16
17  <sect2 role="package">
18    <title/>
19
20    <para>The Glibc package contains the main C library. This library provides
21    the basic routines for allocating memory, searching directories, opening and
22    closing files, reading and writing files, string handling, pattern matching,
23    arithmetic, and so on.</para>
24
25  </sect2>
26
27  <sect2 role="installation">
28    <title>Installation of Glibc</title>
29
30    <note os="z">
31      <para>Some packages outside of CLFS suggest installing GNU libiconv in
32      order to translate data from one encoding to another. The project's
33      home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
34      <quote>This library provides an <function>iconv()</function>
35      implementation, for use on systems which don't have one, or whose
36      implementation cannot convert from/to Unicode.</quote> Glibc provides
37      an <function>iconv()</function> implementation and can convert from/to
38      Unicode, therefore libiconv is not required on a CLFS system.</para>
39    </note>
40
41    <para os="b">The Glibc build system is self-contained and will install
42    perfectly, even though the compiler specs file and linker are still
43    pointing at <filename class="directory">/tools</filename>. The specs
44    and linker cannot be adjusted before the Glibc install because the
45    Glibc Autoconf tests would give false results and defeat the goal
46    of achieving a clean build.</para>
47
48    <para os="c">The following patch fixes an issue that can
49    cause <command>localdef</command> to segfault:</para>
50
51<screen os="d"><userinput>patch -Np1 -i ../&glibc-localedef_segfault-patch;</userinput></screen>
52
53    <para os="e">The Glibc documentation recommends building Glibc outside of the
54    source directory in a dedicated build directory:</para>
55
56<screen os="f"><userinput>mkdir -v ../glibc-build
57cd ../glibc-build</userinput></screen>
58
59    <para os="g">Prepare Glibc for compilation:</para>
60
61<screen os="h"><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
62    --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
63    --libexecdir=/usr/lib/glibc</userinput></screen>
64
65    <variablelist os="i">
66      <title>The meaning of the new configure option:</title>
67
68      <varlistentry>
69        <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
70        <listitem>
71          <para>This changes the location of the <command>pt_chown</command>
72          program from its default of <filename
73          class="directory">/usr/libexec</filename> to <filename
74          class="directory">/usr/lib/glibc</filename>.</para>
75        </listitem>
76      </varlistentry>
77    </variablelist>
78
79    <para os="j">Compile the package:</para>
80
81<screen os="k"><userinput>make</userinput></screen>
82
83    <important os="l">
84      <para>The test suite for Glibc is considered critical.
85      Do not skip it under any circumstance.</para>
86    </important>
87
88    <para os="m">Test the results:</para>
89
90<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
91
92<screen os="n"><userinput>make -k check &gt;glibc-check-log 2&gt;&amp;1 ; grep Error glibc-check-log</userinput></screen>
93
94    <para os="o">The Glibc test suite is highly dependent on certain functions of
95    the host system, in particular the kernel. The posix/annexc test normally fails
96    and you should see <literal>Error 1 (ignored)</literal> in the output. Apart
97    from this, the Glibc test suite is always expected to pass. However, in certain
98    circumstances, some failures are unavoidable. If a test fails because of a missing
99    program (or missing symbolic link), or a segfault, you will see an error code
100    greater than 127 and the details will be in the log. More commonly, tests will
101    fail with <literal>Error 2</literal> - for these, the contents of the corresponding
102    <filename>.out</filename> file, e.g. <filename>posix/annexc.out</filename> may be
103    informative. Here is a list of the most common issues:</para>
104
105    <itemizedlist os="p">
106      <listitem>
107        <para>The <emphasis>math</emphasis> tests sometimes fail.
108        Certain optimization settings are known to be a
109        factor here.</para>
110      </listitem>
111      <listitem>
112        <para>If you have mounted the CLFS partition with the
113        <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
114        will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
115        do not use the <parameter>noatime</parameter> option while building
116        CLFS.</para>
117      </listitem>
118      <listitem>
119        <para>When running on older and slower hardware, some tests
120        can fail because of test timeouts being exceeded.</para>
121      </listitem>
122    </itemizedlist>
123
124    <para os="q">Though it is a harmless message, the install stage of Glibc will
125    complain about the absence of <filename>/etc/ld.so.conf</filename>.
126    Prevent this warning with:</para>
127
128<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
129
130    <para os="s">Install the package:</para>
131
132<screen os="t"><userinput>make install</userinput></screen>
133
134  </sect2>
135
136  <sect2 id="i18n-glibc" role="configuration">
137    <title>Internationalization</title>
138
139    <para>The locales that can make the system respond in a different
140    language were not installed by the above command. Install them
141    with:</para>
142
143<screen><userinput>make localedata/install-locales</userinput></screen>
144
145    <para>To save time, an alternative to running the previous command (which
146    generates and installs every locale listed in the
147    glibc-&glibc-version;/localedata/SUPPORTED file) is to install only
148    those locales that are wanted and needed. This can be achieved by using
149    the <command>localedef</command> command. Information on this command is
150    located in the <filename>INSTALL</filename> file in the Glibc source.
151    However, there are a number of locales that are essential in order for the
152    tests of future packages to pass, in particular, the
153    <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
154    instead of the <parameter>install-locales</parameter> target used above,
155    will install the minimum set of locales necessary for the tests to run
156    successfully:</para>
157
158<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
159localedef -i de_DE -f ISO-8859-1 de_DE
160localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
161localedef -i en_HK -f ISO-8859-1 en_HK
162localedef -i en_PH -f ISO-8859-1 en_PH
163localedef -i en_US -f ISO-8859-1 en_US
164localedef -i es_MX -f ISO-8859-1 es_MX
165localedef -i fa_IR -f UTF-8 fa_IR
166localedef -i fr_FR -f ISO-8859-1 fr_FR
167localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
168localedef -i it_IT -f ISO-8859-1 it_IT
169localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
170
171    <para>Some locales installed by the <command>make
172    localedata/install-locales</command> command above are not properly
173    supported by some applications that are in the CLFS and BLFS books. Because
174    of the various problems that arise due to application programmers making
175    assumptions that break in such locales, CLFS should not be used in locales
176    that utilize multibyte character sets (including UTF-8) or right-to-left
177    writing order.  Numerous unofficial and unstable patches are required to
178    fix these problems, and it has been decided by the CLFS developers not to
179    support such complex locales at this time. This applies to the ja_JP and
180    fa_IR locales as well&mdash;they have been installed only for GCC and
181    Gettext tests to pass, and the <command>watch</command> program (part of
182    the Procps package) does not work properly in them. Various attempts to
183    circumvent these restrictions are documented in internationalization-related
184    hints.</para>
185
186  </sect2>
187
188  <sect2 id="conf-glibc" role="configuration">
189    <title>Configuring Glibc</title>
190
191    <indexterm zone="conf-glibc">
192      <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
193    </indexterm>
194
195    <indexterm zone="conf-glibc">
196      <primary sortas="e-/etc/localtime">/etc/localtime</primary>
197    </indexterm>
198
199    <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
200    because, although Glibc provides defaults when this file is missing or
201    corrupt, the Glibc defaults do not work well in a networked environment.
202    The time zone also needs to be configured.</para>
203
204    <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
205    the following:</para>
206
207<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
208<literal># Begin /etc/nsswitch.conf
209
210passwd: files
211group: files
212shadow: files
213
214hosts: files dns
215networks: files
216
217protocols: files
218services: files
219ethers: files
220rpc: files
221
222# End /etc/nsswitch.conf</literal>
223EOF</userinput></screen>
224
225    <para>To determine the local time zone, run the following script:</para>
226
227<screen role="nodump"><userinput>tzselect</userinput></screen>
228
229    <para>After answering a few questions about the location, the script will
230    output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
231    <emphasis>Canada/Eastern</emphasis>). Then create the
232    <filename>/etc/localtime</filename> file by running:</para>
233
234<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
235    /etc/localtime</userinput></screen>
236
237    <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
238    that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
239
240    <variablelist>
241      <title>The meaning of the cp option:</title>
242
243      <varlistentry>
244        <term><parameter>--remove-destination</parameter></term>
245        <listitem>
246          <para>This is needed to force removal of the already existing symbolic
247          link. The reason for copying the file instead of using a symlink is to
248          cover the situation where <filename class="directory">/usr</filename>
249          is on a separate partition. This could be important when booted into
250          single user mode.</para>
251        </listitem>
252      </varlistentry>
253    </variablelist>
254
255  </sect2>
256
257  <sect2 id="conf-ld" role="configuration">
258    <title>Configuring The Dynamic Loader</title>
259
260    <indexterm zone="conf-ld">
261      <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
262    </indexterm>
263
264    <para>By default, the dynamic loader (<filename
265    class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
266    <filename class="directory">/lib</filename> and <filename
267    class="directory">/usr/lib</filename> for dynamic libraries that are
268    needed by programs as they are run. However, if there are libraries in
269    directories other than <filename class="directory">/lib</filename> and
270    <filename class="directory">/usr/lib</filename>, these need to be
271    added to the <filename>/etc/ld.so.conf</filename> file in order
272    for the dynamic loader to find them. Two directories that are commonly
273    known to contain additional libraries are <filename
274    class="directory">/usr/local/lib</filename> and <filename
275    class="directory">/opt/lib</filename>, so add those directories to the
276    dynamic loader's search path.</para>
277
278    <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
279    following:</para>
280
281<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
282<literal># Begin /etc/ld.so.conf
283
284/usr/local/lib
285/opt/lib
286
287# End /etc/ld.so.conf</literal>
288EOF</userinput></screen>
289
290  </sect2>
291
292  <sect2 id="contents-glibc" role="content">
293    <title>Contents of Glibc</title>
294
295    <segmentedlist>
296      <segtitle>Installed programs</segtitle>
297      <segtitle>Installed libraries</segtitle>
298
299      <seglistitem>
300        <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
301        ldd, lddlibc4, locale, localedef, mtrace, nscd,
302        pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
303        zdump, and zic</seg>
304        <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
305        libbsd-compat.a, libc.[a,so], libcrypt.[a,so], libdl.[a,so], libg.a,
306        libieee.a, libm.[a,so], libmcheck.a, libmemusage.so, libnsl.a,
307        libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
308        libnss_nis.so, libnss_nisplus.so, libpcprofile.so, libpthread.[a,so],
309        libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so, and
310        libutil.[a,so]</seg>
311      </seglistitem>
312    </segmentedlist>
313
314    <variablelist>
315      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
316      <?dbfo list-presentation="list"?>
317      <?dbhtml list-presentation="table"?>
318
319      <varlistentry id="catchsegv">
320        <term><command>catchsegv</command></term>
321        <listitem>
322          <para>Can be used to create a stack trace when a program
323          terminates with a segmentation fault</para>
324          <indexterm zone="ch-system-glibc catchsegv">
325            <primary sortas="b-catchsegv">catchsegv</primary>
326          </indexterm>
327        </listitem>
328      </varlistentry>
329
330      <varlistentry id="gencat">
331        <term><command>gencat</command></term>
332        <listitem>
333          <para>Generates message catalogues</para>
334          <indexterm zone="ch-system-glibc gencat">
335            <primary sortas="b-gencat">gencat</primary>
336          </indexterm>
337        </listitem>
338      </varlistentry>
339
340      <varlistentry id="getconf">
341        <term><command>getconf</command></term>
342        <listitem>
343          <para>Displays the system configuration values for file system specific
344          variables</para>
345          <indexterm zone="ch-system-glibc getconf">
346            <primary sortas="b-getconf">getconf</primary>
347          </indexterm>
348        </listitem>
349      </varlistentry>
350
351      <varlistentry id="getent">
352        <term><command>getent</command></term>
353        <listitem>
354          <para>Gets entries from an administrative database</para>
355          <indexterm zone="ch-system-glibc getent">
356            <primary sortas="b-getent">getent</primary>
357          </indexterm>
358        </listitem>
359      </varlistentry>
360
361      <varlistentry id="iconv">
362        <term><command>iconv</command></term>
363        <listitem>
364          <para>Performs character set conversion</para>
365          <indexterm zone="ch-system-glibc iconv">
366            <primary sortas="b-iconv">iconv</primary>
367          </indexterm>
368        </listitem>
369      </varlistentry>
370
371      <varlistentry id="iconvconfig">
372        <term><command>iconvconfig</command></term>
373        <listitem>
374          <para>Creates fastloading <command>iconv</command> module configuration
375          files</para>
376          <indexterm zone="ch-system-glibc iconvconfig">
377            <primary sortas="b-iconvconfig">iconvconfig</primary>
378          </indexterm>
379        </listitem>
380      </varlistentry>
381
382      <varlistentry id="ldconfig">
383        <term><command>ldconfig</command></term>
384        <listitem>
385          <para>Configures the dynamic linker runtime bindings</para>
386          <indexterm zone="ch-system-glibc ldconfig">
387            <primary sortas="b-ldconfig">ldconfig</primary>
388          </indexterm>
389        </listitem>
390      </varlistentry>
391
392      <varlistentry id="ldd">
393        <term><command>ldd</command></term>
394        <listitem>
395          <para>Reports which shared libraries are required
396          by each given program or shared library</para>
397          <indexterm zone="ch-system-glibc ldd">
398            <primary sortas="b-ldd">ldd</primary>
399          </indexterm>
400        </listitem>
401      </varlistentry>
402
403      <varlistentry id="lddlibc4">
404        <term><command>lddlibc4</command></term>
405        <listitem>
406          <para>Assists <command>ldd</command> with object files</para>
407          <indexterm zone="ch-system-glibc lddlibc4">
408            <primary sortas="b-lddlibc4">lddlibc4</primary>
409          </indexterm>
410        </listitem>
411      </varlistentry>
412
413      <varlistentry id="locale">
414        <term><command>locale</command></term>
415        <listitem>
416          <para>Tells the compiler to enable or disable the use of POSIX locales
417          for built-in operations</para>
418          <indexterm zone="ch-system-glibc locale">
419            <primary sortas="b-locale">locale</primary>
420          </indexterm>
421        </listitem>
422      </varlistentry>
423
424      <varlistentry id="localedef">
425        <term><command>localedef</command></term>
426        <listitem>
427          <para>Compiles locale specifications</para>
428          <indexterm zone="ch-system-glibc localedef">
429            <primary sortas="b-localedef">localedef</primary>
430          </indexterm>
431        </listitem>
432      </varlistentry>
433
434      <varlistentry id="mtrace">
435        <term><command>mtrace</command></term>
436        <listitem>
437          <para>Reads and interprets a memory trace file and
438          displays a summary in human-readable format</para>
439          <indexterm zone="ch-system-glibc mtrace">
440            <primary sortas="b-mtrace">mtrace</primary>
441          </indexterm>
442        </listitem>
443      </varlistentry>
444
445      <varlistentry id="nscd">
446        <term><command>nscd</command></term>
447        <listitem>
448          <para>A daemon that provides a cache for the most common name
449          service requests</para>
450          <indexterm zone="ch-system-glibc nscd">
451            <primary sortas="b-nscd">nscd</primary>
452          </indexterm>
453        </listitem>
454      </varlistentry>
455
456      <varlistentry id="pcprofiledump">
457        <term><command>pcprofiledump</command></term>
458        <listitem>
459          <para>Dumps information generated by PC profiling</para>
460          <indexterm zone="ch-system-glibc pcprofiledump">
461            <primary sortas="b-pcprofiledump">pcprofiledump</primary>
462          </indexterm>
463        </listitem>
464      </varlistentry>
465
466      <varlistentry id="pt_chown">
467        <term><command>pt_chown</command></term>
468        <listitem>
469          <para>A helper program for <command>grantpt</command> to set the owner,
470          group and access permissions of a slave pseudo terminal</para>
471          <indexterm zone="ch-system-glibc pt_chown">
472            <primary sortas="b-pt_chown">pt_chown</primary>
473          </indexterm>
474        </listitem>
475      </varlistentry>
476
477      <varlistentry id="rpcgen">
478        <term><command>rpcgen</command></term>
479        <listitem>
480          <para>Generates C code to implement the Remote Procecure Call (RPC)
481          protocol</para>
482          <indexterm zone="ch-system-glibc rpcgen">
483            <primary sortas="b-rpcgen">rpcgen</primary>
484          </indexterm>
485        </listitem>
486      </varlistentry>
487
488      <varlistentry id="rpcinfo">
489        <term><command>rpcinfo</command></term>
490        <listitem>
491          <para>Makes an RPC call to an RPC server</para>
492          <indexterm zone="ch-system-glibc rpcinfo">
493            <primary sortas="b-rpcinfo">rpcinfo</primary>
494          </indexterm>
495        </listitem>
496      </varlistentry>
497
498      <varlistentry id="sln">
499        <term><command>sln</command></term>
500        <listitem>
501          <para>A statically linked program that creates symbolic links</para>
502          <indexterm zone="ch-system-glibc sln">
503            <primary sortas="b-sln">sln</primary>
504          </indexterm>
505        </listitem>
506      </varlistentry>
507
508      <varlistentry id="sprof">
509        <term><command>sprof</command></term>
510        <listitem>
511          <para>Reads and displays shared object profiling data</para>
512          <indexterm zone="ch-system-glibc sprof">
513            <primary sortas="b-sprof">sprof</primary>
514          </indexterm>
515        </listitem>
516      </varlistentry>
517
518      <varlistentry id="tzselect">
519        <term><command>tzselect</command></term>
520        <listitem>
521          <para>Asks the user about the location of the
522          system and reports the corresponding time zone description</para>
523          <indexterm zone="ch-system-glibc tzselect">
524            <primary sortas="b-tzselect">tzselect</primary>
525          </indexterm>
526        </listitem>
527      </varlistentry>
528
529      <varlistentry id="xtrace">
530        <term><command>xtrace</command></term>
531        <listitem>
532          <para>Traces the execution of a program by
533          printing the currently executed function</para>
534          <indexterm zone="ch-system-glibc xtrace">
535            <primary sortas="b-xtrace">xtrace</primary>
536          </indexterm>
537        </listitem>
538      </varlistentry>
539
540      <varlistentry id="zdump">
541        <term><command>zdump</command></term>
542        <listitem>
543          <para>The time zone dumper</para>
544          <indexterm zone="ch-system-glibc zdump">
545            <primary sortas="b-zdump">zdump</primary>
546          </indexterm>
547        </listitem>
548      </varlistentry>
549
550      <varlistentry id="zic">
551        <term><command>zic</command></term>
552        <listitem>
553          <para>The time zone compiler</para>
554          <indexterm zone="ch-system-glibc zic">
555            <primary sortas="b-zic">zic</primary>
556          </indexterm>
557        </listitem>
558      </varlistentry>
559
560      <varlistentry id="ld.so">
561        <term><filename class="libraryfile">ld.so</filename></term>
562        <listitem>
563          <para>The helper program for shared library executables</para>
564          <indexterm zone="ch-system-glibc ld.so">
565            <primary sortas="c-ld.so">ld.so</primary>
566          </indexterm>
567        </listitem>
568      </varlistentry>
569
570      <varlistentry id="libBrokenLocale">
571        <term><filename class="libraryfile">libBrokenLocale</filename></term>
572        <listitem>
573          <para>Used by programs, such as Mozilla, to solve broken locales</para>
574          <indexterm zone="ch-system-glibc libBrokenLocale">
575            <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
576          </indexterm>
577        </listitem>
578      </varlistentry>
579
580      <varlistentry id="libSegFault">
581        <term><filename class="libraryfile">libSegFault</filename></term>
582        <listitem>
583          <para>The segmentation fault signal handler</para>
584          <indexterm zone="ch-system-glibc libSegFault">
585            <primary sortas="c-libSegFault">libSegFault</primary>
586          </indexterm>
587        </listitem>
588      </varlistentry>
589
590      <varlistentry id="libanl">
591        <term><filename class="libraryfile">libanl</filename></term>
592        <listitem>
593          <para>An asynchronous name lookup library</para>
594          <indexterm zone="ch-system-glibc libanl">
595            <primary sortas="c-libanl">libanl</primary>
596          </indexterm>
597        </listitem>
598      </varlistentry>
599
600      <varlistentry id="libbsd-compat">
601        <term><filename class="libraryfile">libbsd-compat</filename></term>
602        <listitem>
603          <para>Provides the portability needed
604          in order to run certain Berkey Software Distribution (BSD) programs
605          under Linux</para>
606          <indexterm zone="ch-system-glibc libbsd-compat">
607            <primary sortas="c-libbsd-compat">libbsd-compat</primary>
608          </indexterm>
609        </listitem>
610      </varlistentry>
611
612      <varlistentry id="libc">
613        <term><filename class="libraryfile">libc</filename></term>
614        <listitem>
615          <para>The main C library</para>
616          <indexterm zone="ch-system-glibc libc">
617            <primary sortas="c-libc">libc</primary>
618          </indexterm>
619        </listitem>
620      </varlistentry>
621
622      <varlistentry id="libcrypt">
623        <term><filename class="libraryfile">libcrypt</filename></term>
624        <listitem>
625          <para>The cryptography library</para>
626          <indexterm zone="ch-system-glibc libcrypt">
627            <primary sortas="c-libcrypt">libcrypt</primary>
628          </indexterm>
629        </listitem>
630      </varlistentry>
631
632      <varlistentry id="libdl">
633        <term><filename class="libraryfile">libdl</filename></term>
634        <listitem>
635          <para>The dynamic linking interface library</para>
636          <indexterm zone="ch-system-glibc libdl">
637            <primary sortas="c-libdl">libdl</primary>
638          </indexterm>
639        </listitem>
640      </varlistentry>
641
642      <varlistentry id="libg">
643        <term><filename class="libraryfile">libg</filename></term>
644        <listitem>
645          <para>A runtime library for <command>g++</command></para>
646          <indexterm zone="ch-system-glibc libg">
647            <primary sortas="c-libg">libg</primary>
648          </indexterm>
649        </listitem>
650      </varlistentry>
651
652      <varlistentry id="libieee">
653        <term><filename class="libraryfile">libieee</filename></term>
654        <listitem>
655          <para>The Institute of Electrical and Electronic Engineers (IEEE)
656          floating point library</para>
657          <indexterm zone="ch-system-glibc libieee">
658            <primary sortas="c-libieee">libieee</primary>
659          </indexterm>
660        </listitem>
661      </varlistentry>
662
663      <varlistentry id="libm">
664        <term><filename class="libraryfile">libm</filename></term>
665        <listitem>
666          <para>The mathematical library</para>
667          <indexterm zone="ch-system-glibc libm">
668            <primary sortas="c-libm">libm</primary>
669          </indexterm>
670        </listitem>
671      </varlistentry>
672
673      <varlistentry id="libmcheck">
674        <term><filename class="libraryfile">libmcheck</filename></term>
675        <listitem>
676          <para>Contains code run at boot</para>
677          <indexterm zone="ch-system-glibc libmcheck">
678            <primary sortas="c-libmcheck">libmcheck</primary>
679          </indexterm>
680        </listitem>
681      </varlistentry>
682
683      <varlistentry id="libmemusage">
684        <term><filename class="libraryfile">libmemusage</filename></term>
685        <listitem>
686          <para>Used by <command>memusage</command> (included in Glibc, but
687          not built in a base CLFS system as it has additional dependencies)
688          to help collect information about the memory usage of a program</para>
689          <indexterm zone="ch-system-glibc libmemusage">
690            <primary sortas="c-libmemusage">libmemusage</primary>
691          </indexterm>
692        </listitem>
693      </varlistentry>
694
695      <varlistentry id="libnsl">
696        <term><filename class="libraryfile">libnsl</filename></term>
697        <listitem>
698          <para>The network services library</para>
699          <indexterm zone="ch-system-glibc libnsl">
700            <primary sortas="c-libnsl">libnsl</primary>
701          </indexterm>
702        </listitem>
703      </varlistentry>
704
705      <varlistentry id="libnss">
706        <term><filename class="libraryfile">libnss</filename></term>
707        <listitem>
708          <para>The Name Service Switch libraries, containing functions for
709          resolving host names, user names, group names, aliases, services,
710          protocols, etc.</para>
711          <indexterm zone="ch-system-glibc libnss">
712            <primary sortas="c-libnss">libnss</primary>
713          </indexterm>
714        </listitem>
715      </varlistentry>
716
717      <varlistentry id="libpcprofile">
718        <term><filename class="libraryfile">libpcprofile</filename></term>
719        <listitem>
720          <para>Contains profiling functions used to track the amount of CPU
721          time spent in specific source code lines</para>
722          <indexterm zone="ch-system-glibc libpcprofile">
723            <primary sortas="c-libpcprofile">libpcprofile</primary>
724          </indexterm>
725        </listitem>
726      </varlistentry>
727
728      <varlistentry id="libpthread">
729        <term><filename class="libraryfile">libpthread</filename></term>
730        <listitem>
731          <para>The POSIX threads library</para>
732          <indexterm zone="ch-system-glibc libpthread">
733            <primary sortas="c-libpthread">libpthread</primary>
734          </indexterm>
735        </listitem>
736      </varlistentry>
737
738      <varlistentry id="libresolv">
739        <term><filename class="libraryfile">libresolv</filename></term>
740        <listitem>
741          <para>Contains functions for creating, sending, and interpreting
742          packets to the Internet domain name servers</para>
743          <indexterm zone="ch-system-glibc libresolv">
744            <primary sortas="c-libresolv">libresolv</primary>
745          </indexterm>
746        </listitem>
747      </varlistentry>
748
749      <varlistentry id="librpcsvc">
750        <term><filename class="libraryfile">librpcsvc</filename></term>
751        <listitem>
752          <para>Contains functions providing miscellaneous RPC services</para>
753          <indexterm zone="ch-system-glibc librpcsvc">
754            <primary sortas="c-librpcsvc">librpcsvc</primary>
755          </indexterm>
756        </listitem>
757      </varlistentry>
758
759      <varlistentry id="librt">
760        <term><filename class="libraryfile">librt</filename></term>
761        <listitem>
762          <para>Contains functions providing most of the interfaces specified by
763          the POSIX.1b Realtime Extension</para>
764          <indexterm zone="ch-system-glibc librt">
765            <primary sortas="c-librt">librt</primary>
766          </indexterm>
767        </listitem>
768      </varlistentry>
769
770      <varlistentry id="libthread_db">
771        <term><filename class="libraryfile">libthread_db</filename></term>
772        <listitem>
773          <para>Contains functions useful for
774          building debuggers for multi-threaded programs</para>
775          <indexterm zone="ch-system-glibc libthread_db">
776            <primary sortas="c-libthread_db">libthread_db</primary>
777          </indexterm>
778        </listitem>
779      </varlistentry>
780
781      <varlistentry id="libutil">
782        <term><filename class="libraryfile">libutil</filename></term>
783        <listitem>
784          <para>Contains code for <quote>standard</quote> functions used in
785          many different Unix utilities</para>
786          <indexterm zone="ch-system-glibc libutil">
787            <primary sortas="c-libutil">libutil</primary>
788          </indexterm>
789        </listitem>
790      </varlistentry>
791
792    </variablelist>
793
794  </sect2>
795
796</sect1>
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