source: BOOK/final-system/common/glibc.xml @ 3998188

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
Last change on this file since 3998188 was 3998188, checked in by Joe Ciccone <jciccone@…>, 16 years ago

Update the path to ld.so when configuring Glibc for each arch.
  • Property mode set to 100644
File size: 29.9 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="p1">The following patches merges all updates from the &glibc-version; Branch
49    from the Glibc developers:</para>
50
51<screen os="p2"><userinput>patch -Np1 -i ../&glibc-branch_update-patch;</userinput></screen>
52
53    <para os="c">The following patch fixes an issue that can
54    cause <command>localdef</command> to segfault:</para>
55
56<screen os="d"><userinput>patch -Np1 -i ../&glibc-localedef_segfault-patch;</userinput></screen>
57
58    <para os="e">The Glibc documentation recommends building Glibc outside of the
59    source directory in a dedicated build directory:</para>
60
61<screen os="f"><userinput>mkdir -v ../glibc-build
62cd ../glibc-build</userinput></screen>
63
64    <para os="g">Prepare Glibc for compilation:</para>
65
66<screen os="h"><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
67    --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
68    --libexecdir=/usr/lib/glibc</userinput></screen>
69
70    <variablelist os="i">
71      <title>The meaning of the new configure option:</title>
72
73      <varlistentry>
74        <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
75        <listitem>
76          <para>This changes the location of the <command>pt_chown</command>
77          program from its default of <filename
78          class="directory">/usr/libexec</filename> to <filename
79          class="directory">/usr/lib/glibc</filename>.</para>
80        </listitem>
81      </varlistentry>
82    </variablelist>
83
84    <para os="j">Compile the package:</para>
85
86<screen os="k"><userinput>make</userinput></screen>
87
88    <important os="l">
89      <para>The test suite for Glibc is considered critical.
90      Do not skip it under any circumstance.</para>
91    </important>
92
93    <para os="m">Test the results:</para>
94
95<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
96
97<screen os="n"><userinput>make -k check &gt;glibc-check-log 2&gt;&amp;1 ; grep Error glibc-check-log</userinput></screen>
98
99    <para os="o">The Glibc test suite is highly dependent on certain functions of
100    the host system, in particular the kernel. The posix/annexc test normally fails
101    and you should see <literal>Error 1 (ignored)</literal> in the output. Apart
102    from this, the Glibc test suite is always expected to pass. However, in certain
103    circumstances, some failures are unavoidable. If a test fails because of a missing
104    program (or missing symbolic link), or a segfault, you will see an error code
105    greater than 127 and the details will be in the log. More commonly, tests will
106    fail with <literal>Error 2</literal> - for these, the contents of the corresponding
107    <filename>.out</filename> file, e.g. <filename>posix/annexc.out</filename> may be
108    informative. Here is a list of the most common issues:</para>
109
110    <itemizedlist os="p">
111      <listitem>
112        <para>The <emphasis>math</emphasis> tests sometimes fail.
113        Certain optimization settings are known to be a
114        factor here.</para>
115      </listitem>
116      <listitem>
117        <para>If you have mounted the CLFS partition with the
118        <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
119        will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
120        do not use the <parameter>noatime</parameter> option while building
121        CLFS.</para>
122      </listitem>
123      <listitem>
124        <para>When running on older and slower hardware, some tests
125        can fail because of test timeouts being exceeded.</para>
126      </listitem>
127    </itemizedlist>
128
129    <para os="q">Though it is a harmless message, the install stage of Glibc will
130    complain about the absence of <filename>/etc/ld.so.conf</filename>.
131    Prevent this warning with:</para>
132
133<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
134
135    <para os="s">Install the package:</para>
136
137<screen os="t"><userinput>make install</userinput></screen>
138
139  </sect2>
140
141  <sect2 id="i18n-glibc" role="configuration">
142    <title>Internationalization</title>
143
144    <para>The locales that can make the system respond in a different
145    language were not installed by the above command. Install them
146    with:</para>
147
148<screen><userinput>make localedata/install-locales</userinput></screen>
149
150    <para>To save time, an alternative to running the previous command (which
151    generates and installs every locale listed in the
152    glibc-&glibc-version;/localedata/SUPPORTED file) is to install only
153    those locales that are wanted and needed. This can be achieved by using
154    the <command>localedef</command> command. Information on this command is
155    located in the <filename>INSTALL</filename> file in the Glibc source.
156    However, there are a number of locales that are essential in order for the
157    tests of future packages to pass, in particular, the
158    <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
159    instead of the <parameter>install-locales</parameter> target used above,
160    will install the minimum set of locales necessary for the tests to run
161    successfully:</para>
162
163<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
164localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
165localedef -i de_DE -f ISO-8859-1 de_DE
166localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
167localedef -i en_HK -f ISO-8859-1 en_HK
168localedef -i en_PH -f ISO-8859-1 en_PH
169localedef -i en_US -f ISO-8859-1 en_US
170localedef -i es_MX -f ISO-8859-1 es_MX
171localedef -i fa_IR -f UTF-8 fa_IR
172localedef -i fr_FR -f ISO-8859-1 fr_FR
173localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
174localedef -i it_IT -f ISO-8859-1 it_IT
175localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
176
177    <para>Some locales installed by the <command>make
178    localedata/install-locales</command> command above are not properly
179    supported by some applications that are in the CLFS and BLFS books. Because
180    of the various problems that arise due to application programmers making
181    assumptions that break in such locales, CLFS should not be used in locales
182    that utilize multibyte character sets (including UTF-8) or right-to-left
183    writing order.  Numerous unofficial and unstable patches are required to
184    fix these problems, and it has been decided by the CLFS developers not to
185    support such complex locales at this time. This applies to the ja_JP and
186    fa_IR locales as well&mdash;they have been installed only for GCC and
187    Gettext tests to pass, and the <command>watch</command> program (part of
188    the Procps package) does not work properly in them. Various attempts to
189    circumvent these restrictions are documented in internationalization-related
190    hints.</para>
191
192  </sect2>
193
194  <sect2 id="conf-glibc" role="configuration">
195    <title>Configuring Glibc</title>
196
197    <indexterm zone="conf-glibc">
198      <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
199    </indexterm>
200
201    <indexterm zone="conf-glibc">
202      <primary sortas="e-/etc/localtime">/etc/localtime</primary>
203    </indexterm>
204
205    <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
206    because, although Glibc provides defaults when this file is missing or
207    corrupt, the Glibc defaults do not work well in a networked environment.
208    The time zone also needs to be configured.</para>
209
210    <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
211    the following:</para>
212
213<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
214<literal># Begin /etc/nsswitch.conf
215
216passwd: files
217group: files
218shadow: files
219
220hosts: files dns
221networks: files
222
223protocols: files
224services: files
225ethers: files
226rpc: files
227
228# End /etc/nsswitch.conf</literal>
229EOF</userinput></screen>
230
231    <para>To determine the local time zone, run the following script:</para>
232
233<screen role="nodump"><userinput>tzselect</userinput></screen>
234
235    <para>After answering a few questions about the location, the script will
236    output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
237    <emphasis>Canada/Eastern</emphasis>). Then create the
238    <filename>/etc/localtime</filename> file by running:</para>
239
240<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
241    /etc/localtime</userinput></screen>
242
243    <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
244    that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
245
246    <variablelist>
247      <title>The meaning of the cp option:</title>
248
249      <varlistentry>
250        <term><parameter>--remove-destination</parameter></term>
251        <listitem>
252          <para>This is needed to force removal of the already existing symbolic
253          link. The reason for copying the file instead of using a symlink is to
254          cover the situation where <filename class="directory">/usr</filename>
255          is on a separate partition. This could be important when booted into
256          single user mode.</para>
257        </listitem>
258      </varlistentry>
259    </variablelist>
260
261  </sect2>
262
263  <sect2 id="conf-ld" role="configuration">
264    <title>Configuring The Dynamic Loader</title>
265
266    <indexterm zone="conf-ld">
267      <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
268    </indexterm>
269
270    <para os="ld-a">By default, the dynamic loader (<filename
271    class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
272    <filename class="directory">/lib</filename> and <filename
273    class="directory">/usr/lib</filename> for dynamic libraries that are
274    needed by programs as they are run. However, if there are libraries in
275    directories other than <filename class="directory">/lib</filename> and
276    <filename class="directory">/usr/lib</filename>, these need to be
277    added to the <filename>/etc/ld.so.conf</filename> file in order
278    for the dynamic loader to find them. Two directories that are commonly
279    known to contain additional libraries are <filename
280    class="directory">/usr/local/lib</filename> and <filename
281    class="directory">/opt/lib</filename>, so add those directories to the
282    dynamic loader's search path.</para>
283
284    <para os="ld-b">Create a new file <filename>/etc/ld.so.conf</filename> by running the
285    following:</para>
286
287<screen os="ld-c"><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
288<literal># Begin /etc/ld.so.conf
289
290/usr/local/lib
291/opt/lib
292
293# End /etc/ld.so.conf</literal>
294EOF</userinput></screen>
295
296  </sect2>
297
298  <sect2 id="contents-glibc" role="content">
299    <title>Contents of Glibc</title>
300
301    <segmentedlist>
302      <segtitle>Installed programs</segtitle>
303      <segtitle>Installed libraries</segtitle>
304
305      <seglistitem>
306        <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
307        ldd, lddlibc4, locale, localedef, mtrace, nscd,
308        pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
309        zdump, and zic</seg>
310        <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
311        libbsd-compat.a, libc.[a,so], libcrypt.[a,so], libdl.[a,so], libg.a,
312        libieee.a, libm.[a,so], libmcheck.a, libmemusage.so, libnsl.a,
313        libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
314        libnss_nis.so, libnss_nisplus.so, libpcprofile.so, libpthread.[a,so],
315        libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so, and
316        libutil.[a,so]</seg>
317      </seglistitem>
318    </segmentedlist>
319
320    <variablelist>
321      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
322      <?dbfo list-presentation="list"?>
323      <?dbhtml list-presentation="table"?>
324
325      <varlistentry id="catchsegv">
326        <term><command>catchsegv</command></term>
327        <listitem>
328          <para>Can be used to create a stack trace when a program
329          terminates with a segmentation fault</para>
330          <indexterm zone="ch-system-glibc catchsegv">
331            <primary sortas="b-catchsegv">catchsegv</primary>
332          </indexterm>
333        </listitem>
334      </varlistentry>
335
336      <varlistentry id="gencat">
337        <term><command>gencat</command></term>
338        <listitem>
339          <para>Generates message catalogues</para>
340          <indexterm zone="ch-system-glibc gencat">
341            <primary sortas="b-gencat">gencat</primary>
342          </indexterm>
343        </listitem>
344      </varlistentry>
345
346      <varlistentry id="getconf">
347        <term><command>getconf</command></term>
348        <listitem>
349          <para>Displays the system configuration values for file system specific
350          variables</para>
351          <indexterm zone="ch-system-glibc getconf">
352            <primary sortas="b-getconf">getconf</primary>
353          </indexterm>
354        </listitem>
355      </varlistentry>
356
357      <varlistentry id="getent">
358        <term><command>getent</command></term>
359        <listitem>
360          <para>Gets entries from an administrative database</para>
361          <indexterm zone="ch-system-glibc getent">
362            <primary sortas="b-getent">getent</primary>
363          </indexterm>
364        </listitem>
365      </varlistentry>
366
367      <varlistentry id="iconv">
368        <term><command>iconv</command></term>
369        <listitem>
370          <para>Performs character set conversion</para>
371          <indexterm zone="ch-system-glibc iconv">
372            <primary sortas="b-iconv">iconv</primary>
373          </indexterm>
374        </listitem>
375      </varlistentry>
376
377      <varlistentry id="iconvconfig">
378        <term><command>iconvconfig</command></term>
379        <listitem>
380          <para>Creates fastloading <command>iconv</command> module configuration
381          files</para>
382          <indexterm zone="ch-system-glibc iconvconfig">
383            <primary sortas="b-iconvconfig">iconvconfig</primary>
384          </indexterm>
385        </listitem>
386      </varlistentry>
387
388      <varlistentry id="ldconfig">
389        <term><command>ldconfig</command></term>
390        <listitem>
391          <para>Configures the dynamic linker runtime bindings</para>
392          <indexterm zone="ch-system-glibc ldconfig">
393            <primary sortas="b-ldconfig">ldconfig</primary>
394          </indexterm>
395        </listitem>
396      </varlistentry>
397
398      <varlistentry id="ldd">
399        <term><command>ldd</command></term>
400        <listitem>
401          <para>Reports which shared libraries are required
402          by each given program or shared library</para>
403          <indexterm zone="ch-system-glibc ldd">
404            <primary sortas="b-ldd">ldd</primary>
405          </indexterm>
406        </listitem>
407      </varlistentry>
408
409      <varlistentry id="lddlibc4">
410        <term><command>lddlibc4</command></term>
411        <listitem>
412          <para>Assists <command>ldd</command> with object files</para>
413          <indexterm zone="ch-system-glibc lddlibc4">
414            <primary sortas="b-lddlibc4">lddlibc4</primary>
415          </indexterm>
416        </listitem>
417      </varlistentry>
418
419      <varlistentry id="locale">
420        <term><command>locale</command></term>
421        <listitem>
422          <para>Tells the compiler to enable or disable the use of POSIX locales
423          for built-in operations</para>
424          <indexterm zone="ch-system-glibc locale">
425            <primary sortas="b-locale">locale</primary>
426          </indexterm>
427        </listitem>
428      </varlistentry>
429
430      <varlistentry id="localedef">
431        <term><command>localedef</command></term>
432        <listitem>
433          <para>Compiles locale specifications</para>
434          <indexterm zone="ch-system-glibc localedef">
435            <primary sortas="b-localedef">localedef</primary>
436          </indexterm>
437        </listitem>
438      </varlistentry>
439
440      <varlistentry id="mtrace">
441        <term><command>mtrace</command></term>
442        <listitem>
443          <para>Reads and interprets a memory trace file and
444          displays a summary in human-readable format</para>
445          <indexterm zone="ch-system-glibc mtrace">
446            <primary sortas="b-mtrace">mtrace</primary>
447          </indexterm>
448        </listitem>
449      </varlistentry>
450
451      <varlistentry id="nscd">
452        <term><command>nscd</command></term>
453        <listitem>
454          <para>A daemon that provides a cache for the most common name
455          service requests</para>
456          <indexterm zone="ch-system-glibc nscd">
457            <primary sortas="b-nscd">nscd</primary>
458          </indexterm>
459        </listitem>
460      </varlistentry>
461
462      <varlistentry id="pcprofiledump">
463        <term><command>pcprofiledump</command></term>
464        <listitem>
465          <para>Dumps information generated by PC profiling</para>
466          <indexterm zone="ch-system-glibc pcprofiledump">
467            <primary sortas="b-pcprofiledump">pcprofiledump</primary>
468          </indexterm>
469        </listitem>
470      </varlistentry>
471
472      <varlistentry id="pt_chown">
473        <term><command>pt_chown</command></term>
474        <listitem>
475          <para>A helper program for <command>grantpt</command> to set the owner,
476          group and access permissions of a slave pseudo terminal</para>
477          <indexterm zone="ch-system-glibc pt_chown">
478            <primary sortas="b-pt_chown">pt_chown</primary>
479          </indexterm>
480        </listitem>
481      </varlistentry>
482
483      <varlistentry id="rpcgen">
484        <term><command>rpcgen</command></term>
485        <listitem>
486          <para>Generates C code to implement the Remote Procecure Call (RPC)
487          protocol</para>
488          <indexterm zone="ch-system-glibc rpcgen">
489            <primary sortas="b-rpcgen">rpcgen</primary>
490          </indexterm>
491        </listitem>
492      </varlistentry>
493
494      <varlistentry id="rpcinfo">
495        <term><command>rpcinfo</command></term>
496        <listitem>
497          <para>Makes an RPC call to an RPC server</para>
498          <indexterm zone="ch-system-glibc rpcinfo">
499            <primary sortas="b-rpcinfo">rpcinfo</primary>
500          </indexterm>
501        </listitem>
502      </varlistentry>
503
504      <varlistentry id="sln">
505        <term><command>sln</command></term>
506        <listitem>
507          <para>A statically linked program that creates symbolic links</para>
508          <indexterm zone="ch-system-glibc sln">
509            <primary sortas="b-sln">sln</primary>
510          </indexterm>
511        </listitem>
512      </varlistentry>
513
514      <varlistentry id="sprof">
515        <term><command>sprof</command></term>
516        <listitem>
517          <para>Reads and displays shared object profiling data</para>
518          <indexterm zone="ch-system-glibc sprof">
519            <primary sortas="b-sprof">sprof</primary>
520          </indexterm>
521        </listitem>
522      </varlistentry>
523
524      <varlistentry id="tzselect">
525        <term><command>tzselect</command></term>
526        <listitem>
527          <para>Asks the user about the location of the
528          system and reports the corresponding time zone description</para>
529          <indexterm zone="ch-system-glibc tzselect">
530            <primary sortas="b-tzselect">tzselect</primary>
531          </indexterm>
532        </listitem>
533      </varlistentry>
534
535      <varlistentry id="xtrace">
536        <term><command>xtrace</command></term>
537        <listitem>
538          <para>Traces the execution of a program by
539          printing the currently executed function</para>
540          <indexterm zone="ch-system-glibc xtrace">
541            <primary sortas="b-xtrace">xtrace</primary>
542          </indexterm>
543        </listitem>
544      </varlistentry>
545
546      <varlistentry id="zdump">
547        <term><command>zdump</command></term>
548        <listitem>
549          <para>The time zone dumper</para>
550          <indexterm zone="ch-system-glibc zdump">
551            <primary sortas="b-zdump">zdump</primary>
552          </indexterm>
553        </listitem>
554      </varlistentry>
555
556      <varlistentry id="zic">
557        <term><command>zic</command></term>
558        <listitem>
559          <para>The time zone compiler</para>
560          <indexterm zone="ch-system-glibc zic">
561            <primary sortas="b-zic">zic</primary>
562          </indexterm>
563        </listitem>
564      </varlistentry>
565
566      <varlistentry id="ld.so">
567        <term><filename class="libraryfile">ld.so</filename></term>
568        <listitem>
569          <para>The helper program for shared library executables</para>
570          <indexterm zone="ch-system-glibc ld.so">
571            <primary sortas="c-ld.so">ld.so</primary>
572          </indexterm>
573        </listitem>
574      </varlistentry>
575
576      <varlistentry id="libBrokenLocale">
577        <term><filename class="libraryfile">libBrokenLocale</filename></term>
578        <listitem>
579          <para>Used by programs, such as Mozilla, to solve broken locales</para>
580          <indexterm zone="ch-system-glibc libBrokenLocale">
581            <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
582          </indexterm>
583        </listitem>
584      </varlistentry>
585
586      <varlistentry id="libSegFault">
587        <term><filename class="libraryfile">libSegFault</filename></term>
588        <listitem>
589          <para>The segmentation fault signal handler</para>
590          <indexterm zone="ch-system-glibc libSegFault">
591            <primary sortas="c-libSegFault">libSegFault</primary>
592          </indexterm>
593        </listitem>
594      </varlistentry>
595
596      <varlistentry id="libanl">
597        <term><filename class="libraryfile">libanl</filename></term>
598        <listitem>
599          <para>An asynchronous name lookup library</para>
600          <indexterm zone="ch-system-glibc libanl">
601            <primary sortas="c-libanl">libanl</primary>
602          </indexterm>
603        </listitem>
604      </varlistentry>
605
606      <varlistentry id="libbsd-compat">
607        <term><filename class="libraryfile">libbsd-compat</filename></term>
608        <listitem>
609          <para>Provides the portability needed
610          in order to run certain Berkey Software Distribution (BSD) programs
611          under Linux</para>
612          <indexterm zone="ch-system-glibc libbsd-compat">
613            <primary sortas="c-libbsd-compat">libbsd-compat</primary>
614          </indexterm>
615        </listitem>
616      </varlistentry>
617
618      <varlistentry id="libc">
619        <term><filename class="libraryfile">libc</filename></term>
620        <listitem>
621          <para>The main C library</para>
622          <indexterm zone="ch-system-glibc libc">
623            <primary sortas="c-libc">libc</primary>
624          </indexterm>
625        </listitem>
626      </varlistentry>
627
628      <varlistentry id="libcrypt">
629        <term><filename class="libraryfile">libcrypt</filename></term>
630        <listitem>
631          <para>The cryptography library</para>
632          <indexterm zone="ch-system-glibc libcrypt">
633            <primary sortas="c-libcrypt">libcrypt</primary>
634          </indexterm>
635        </listitem>
636      </varlistentry>
637
638      <varlistentry id="libdl">
639        <term><filename class="libraryfile">libdl</filename></term>
640        <listitem>
641          <para>The dynamic linking interface library</para>
642          <indexterm zone="ch-system-glibc libdl">
643            <primary sortas="c-libdl">libdl</primary>
644          </indexterm>
645        </listitem>
646      </varlistentry>
647
648      <varlistentry id="libg">
649        <term><filename class="libraryfile">libg</filename></term>
650        <listitem>
651          <para>A runtime library for <command>g++</command></para>
652          <indexterm zone="ch-system-glibc libg">
653            <primary sortas="c-libg">libg</primary>
654          </indexterm>
655        </listitem>
656      </varlistentry>
657
658      <varlistentry id="libieee">
659        <term><filename class="libraryfile">libieee</filename></term>
660        <listitem>
661          <para>The Institute of Electrical and Electronic Engineers (IEEE)
662          floating point library</para>
663          <indexterm zone="ch-system-glibc libieee">
664            <primary sortas="c-libieee">libieee</primary>
665          </indexterm>
666        </listitem>
667      </varlistentry>
668
669      <varlistentry id="libm">
670        <term><filename class="libraryfile">libm</filename></term>
671        <listitem>
672          <para>The mathematical library</para>
673          <indexterm zone="ch-system-glibc libm">
674            <primary sortas="c-libm">libm</primary>
675          </indexterm>
676        </listitem>
677      </varlistentry>
678
679      <varlistentry id="libmcheck">
680        <term><filename class="libraryfile">libmcheck</filename></term>
681        <listitem>
682          <para>Contains code run at boot</para>
683          <indexterm zone="ch-system-glibc libmcheck">
684            <primary sortas="c-libmcheck">libmcheck</primary>
685          </indexterm>
686        </listitem>
687      </varlistentry>
688
689      <varlistentry id="libmemusage">
690        <term><filename class="libraryfile">libmemusage</filename></term>
691        <listitem>
692          <para>Used by <command>memusage</command> (included in Glibc, but
693          not built in a base CLFS system as it has additional dependencies)
694          to help collect information about the memory usage of a program</para>
695          <indexterm zone="ch-system-glibc libmemusage">
696            <primary sortas="c-libmemusage">libmemusage</primary>
697          </indexterm>
698        </listitem>
699      </varlistentry>
700
701      <varlistentry id="libnsl">
702        <term><filename class="libraryfile">libnsl</filename></term>
703        <listitem>
704          <para>The network services library</para>
705          <indexterm zone="ch-system-glibc libnsl">
706            <primary sortas="c-libnsl">libnsl</primary>
707          </indexterm>
708        </listitem>
709      </varlistentry>
710
711      <varlistentry id="libnss">
712        <term><filename class="libraryfile">libnss</filename></term>
713        <listitem>
714          <para>The Name Service Switch libraries, containing functions for
715          resolving host names, user names, group names, aliases, services,
716          protocols, etc.</para>
717          <indexterm zone="ch-system-glibc libnss">
718            <primary sortas="c-libnss">libnss</primary>
719          </indexterm>
720        </listitem>
721      </varlistentry>
722
723      <varlistentry id="libpcprofile">
724        <term><filename class="libraryfile">libpcprofile</filename></term>
725        <listitem>
726          <para>Contains profiling functions used to track the amount of CPU
727          time spent in specific source code lines</para>
728          <indexterm zone="ch-system-glibc libpcprofile">
729            <primary sortas="c-libpcprofile">libpcprofile</primary>
730          </indexterm>
731        </listitem>
732      </varlistentry>
733
734      <varlistentry id="libpthread">
735        <term><filename class="libraryfile">libpthread</filename></term>
736        <listitem>
737          <para>The POSIX threads library</para>
738          <indexterm zone="ch-system-glibc libpthread">
739            <primary sortas="c-libpthread">libpthread</primary>
740          </indexterm>
741        </listitem>
742      </varlistentry>
743
744      <varlistentry id="libresolv">
745        <term><filename class="libraryfile">libresolv</filename></term>
746        <listitem>
747          <para>Contains functions for creating, sending, and interpreting
748          packets to the Internet domain name servers</para>
749          <indexterm zone="ch-system-glibc libresolv">
750            <primary sortas="c-libresolv">libresolv</primary>
751          </indexterm>
752        </listitem>
753      </varlistentry>
754
755      <varlistentry id="librpcsvc">
756        <term><filename class="libraryfile">librpcsvc</filename></term>
757        <listitem>
758          <para>Contains functions providing miscellaneous RPC services</para>
759          <indexterm zone="ch-system-glibc librpcsvc">
760            <primary sortas="c-librpcsvc">librpcsvc</primary>
761          </indexterm>
762        </listitem>
763      </varlistentry>
764
765      <varlistentry id="librt">
766        <term><filename class="libraryfile">librt</filename></term>
767        <listitem>
768          <para>Contains functions providing most of the interfaces specified by
769          the POSIX.1b Realtime Extension</para>
770          <indexterm zone="ch-system-glibc librt">
771            <primary sortas="c-librt">librt</primary>
772          </indexterm>
773        </listitem>
774      </varlistentry>
775
776      <varlistentry id="libthread_db">
777        <term><filename class="libraryfile">libthread_db</filename></term>
778        <listitem>
779          <para>Contains functions useful for
780          building debuggers for multi-threaded programs</para>
781          <indexterm zone="ch-system-glibc libthread_db">
782            <primary sortas="c-libthread_db">libthread_db</primary>
783          </indexterm>
784        </listitem>
785      </varlistentry>
786
787      <varlistentry id="libutil">
788        <term><filename class="libraryfile">libutil</filename></term>
789        <listitem>
790          <para>Contains code for <quote>standard</quote> functions used in
791          many different Unix utilities</para>
792          <indexterm zone="ch-system-glibc libutil">
793            <primary sortas="c-libutil">libutil</primary>
794          </indexterm>
795        </listitem>
796      </varlistentry>
797
798    </variablelist>
799
800  </sect2>
801
802</sect1>
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