source: final-system/common/glibc.xml @ 97475d9

Last change on this file since 97475d9 was 97475d9, checked in by Jim Gifford <clfs@…>, 15 years ago

r3761@server (orig r1701): chris | 2006-05-30 14:38:46 -0700
More updates to the list of programs installed

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File size: 30.0 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
3  "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
4  <!ENTITY % general-entities SYSTEM "../../general.ent">
5  %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9  <?dbhtml filename="glibc.html"?>
10
11  <title>Glibc-&glibc-version;</title>
12
13  <indexterm zone="ch-system-glibc">
14    <primary sortas="a-Glibc">Glibc</primary>
15  </indexterm>
16
17  <sect2 role="package">
18    <title/>
19
20    <para>The Glibc package contains the main C library. This library provides
21    the basic routines for allocating memory, searching directories, opening and
22    closing files, reading and writing files, string handling, pattern matching,
23    arithmetic, and so on.</para>
24
25  </sect2>
26
27  <sect2 role="installation">
28    <title>Installation of Glibc</title>
29
30    <note os="z">
31      <para>Some packages outside of LFS 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 an LFS 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="s1">The following sed fixes a build issue with Glibc. This
54    will prevent nscd from trying to link to libraries that don't exist:</para>
55
56<screen os="s2"><userinput>cp -v nscd/Makefile{,.orig}
57sed -e "/nscd_stat.o: sysincludes = # nothing/d" nscd/Makefile.orig > \
58    nscd/Makefile</userinput></screen>
59
60    <para os="e">The Glibc documentation recommends building Glibc outside of the
61    source directory in a dedicated build directory:</para>
62
63<screen os="f"><userinput>mkdir -v ../glibc-build
64cd ../glibc-build</userinput></screen>
65
66    <para os="g">Prepare Glibc for compilation:</para>
67
68<screen os="h"><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
69    --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
70    --libexecdir=/usr/lib/glibc</userinput></screen>
71
72    <variablelist os="i">
73      <title>The meaning of the new configure option:</title>
74
75      <varlistentry>
76        <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
77        <listitem>
78          <para>This changes the location of the <command>pt_chown</command>
79          program from its default of <filename
80          class="directory">/usr/libexec</filename> to <filename
81          class="directory">/usr/lib/glibc</filename>.</para>
82        </listitem>
83      </varlistentry>
84    </variablelist>
85
86    <para os="j">Compile the package:</para>
87
88<screen os="k"><userinput>make</userinput></screen>
89
90    <important os="l">
91      <para>In this section, the test suite for Glibc is considered critical.
92      Do not skip it under any circumstance.</para>
93    </important>
94
95    <para os="m">Test the results:</para>
96
97<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
98
99<screen os="n"><userinput>make -k check &gt;glibc-check-log 2&gt;&amp;1 ; grep Error glibc-check-log</userinput></screen>
100
101    <para os="o">The Glibc test suite is highly dependent on certain functions of
102    the host system, in particular the kernel. In general, the Glibc test
103    suite is always expected to pass. However, in certain circumstances,
104    some failures are unavoidable. This is a list of the most common
105    issues:</para>
106
107    <itemizedlist os="p">
108      <listitem>
109        <para>The <emphasis>math</emphasis> tests, at least on i686, fail in
110        the <emphasis>test-double</emphasis> and <emphasis>test-idouble</emphasis>
111        tests with gcc-&gcc-version;, the <command>grep</command> command will
112        also report an expected (ignored) failure in <emphasis>posix/annexc
113        </emphasis>. These two failures in the math tests appear to be harmless.
114        The math tests may also fail on systems where the CPU is not a relatively
115        new genuine Intel or authentic AMD. Certain optimization settings are
116        also known to be a factor here.</para>
117      </listitem>
118      <listitem>
119        <para>The <emphasis>gettext</emphasis> test sometimes fails due to
120        host system issues. The exact reasons are not yet clear.</para>
121      </listitem>
122      <listitem>
123        <para>If you have mounted the LFS partition with the
124        <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
125        will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
126        do not use the <parameter>noatime</parameter> option while building
127        LFS.</para>
128      </listitem>
129      <listitem>
130        <para>When running on older and slower hardware, some tests
131        can fail because of test timeouts being exceeded.</para>
132      </listitem>
133    </itemizedlist>
134
135    <para os="q">Though it is a harmless message, the install stage of Glibc will
136    complain about the absence of <filename>/etc/ld.so.conf</filename>.
137    Prevent this warning with:</para>
138
139<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
140
141    <para os="s">Install the package:</para>
142
143<screen os="t"><userinput>make install</userinput></screen>
144
145  </sect2>
146
147  <sect2 id="i18n-glibc" role="configuration">
148    <title>Internationalization</title>
149
150    <para>The locales that can make the system respond in a different
151    language were not installed by the above command. Install them
152    with:</para>
153
154<screen><userinput>make localedata/install-locales</userinput></screen>
155
156    <para>To save time, an alternative to running the previous command (which
157    generates and installs every locale listed in the
158    glibc-&glibc-version;/localedata/SUPPORTED file) is to install only
159    those locales that are wanted and needed. This can be achieved by using
160    the <command>localedef</command> command. Information on this command is
161    located in the <filename>INSTALL</filename> file in the Glibc source.
162    However, there are a number of locales that are essential in order for the
163    tests of future packages to pass, in particular, the
164    <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
165    instead of the <parameter>install-locales</parameter> target used above,
166    will install the minimum set of locales necessary for the tests to run
167    successfully:</para>
168
169<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
170localedef -i de_DE -f ISO-8859-1 de_DE
171localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
172localedef -i en_HK -f ISO-8859-1 en_HK
173localedef -i en_PH -f ISO-8859-1 en_PH
174localedef -i en_US -f ISO-8859-1 en_US
175localedef -i es_MX -f ISO-8859-1 es_MX
176localedef -i fa_IR -f UTF-8 fa_IR
177localedef -i fr_FR -f ISO-8859-1 fr_FR
178localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
179localedef -i it_IT -f ISO-8859-1 it_IT
180localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
181
182    <para>Some locales installed by the <command>make
183    localedata/install-locales</command> command above are not properly
184    supported by some applications that are in the LFS and BLFS books. Because
185    of the various problems that arise due to application programmers making
186    assumptions that break in such locales, LFS should not be used in locales
187    that utilize multibyte character sets (including UTF-8) or right-to-left
188    writing order.  Numerous unofficial and unstable patches are required to
189    fix these problems, and it has been decided by the LFS developers not to
190    support such complex locales at this time. This applies to the ja_JP and
191    fa_IR locales as well&mdash;they have been installed only for GCC and
192    Gettext tests to pass, and the <command>watch</command> program (part of
193    the Procps package) does not work properly in them. Various attempts to
194    circumvent these restrictions are documented in internationalization-related
195    hints.</para>
196
197  </sect2>
198
199  <sect2 id="conf-glibc" role="configuration">
200    <title>Configuring Glibc</title>
201
202    <indexterm zone="conf-glibc">
203      <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
204    </indexterm>
205
206    <indexterm zone="conf-glibc">
207      <primary sortas="e-/etc/localtime">/etc/localtime</primary>
208    </indexterm>
209
210    <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
211    because, although Glibc provides defaults when this file is missing or
212    corrupt, the Glibc defaults do not work well in a networked environment.
213    The time zone also needs to be configured.</para>
214
215    <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
216    the following:</para>
217
218<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
219<literal># Begin /etc/nsswitch.conf
220
221passwd: files
222group: files
223shadow: files
224
225hosts: files dns
226networks: files
227
228protocols: files
229services: files
230ethers: files
231rpc: files
232
233# End /etc/nsswitch.conf</literal>
234EOF</userinput></screen>
235
236    <para>To determine the local time zone, run the following script:</para>
237
238<screen role="nodump"><userinput>tzselect</userinput></screen>
239
240    <para>After answering a few questions about the location, the script will
241    output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
242    <emphasis>Canada/Eastern</emphasis>). Then create the
243    <filename>/etc/localtime</filename> file by running:</para>
244
245<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
246    /etc/localtime</userinput></screen>
247
248    <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
249    that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
250
251    <variablelist>
252      <title>The meaning of the cp option:</title>
253
254      <varlistentry>
255        <term><parameter>--remove-destination</parameter></term>
256        <listitem>
257          <para>This is needed to force removal of the already existing symbolic
258          link. The reason for copying the file instead of using a symlink is to
259          cover the situation where <filename class="directory">/usr</filename>
260          is on a separate partition. This could be important when booted into
261          single user mode.</para>
262        </listitem>
263      </varlistentry>
264    </variablelist>
265
266  </sect2>
267
268  <sect2 id="conf-ld" role="configuration">
269    <title>Configuring The Dynamic Loader</title>
270
271    <indexterm zone="conf-ld">
272      <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
273    </indexterm>
274
275    <para>By default, the dynamic loader (<filename
276    class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
277    <filename class="directory">/lib</filename> and <filename
278    class="directory">/usr/lib</filename> for dynamic libraries that are
279    needed by programs as they are run. However, if there are libraries in
280    directories other than <filename class="directory">/lib</filename> and
281    <filename class="directory">/usr/lib</filename>, these need to be
282    added to the <filename>/etc/ld.so.conf</filename> file in order
283    for the dynamic loader to find them. Two directories that are commonly
284    known to contain additional libraries are <filename
285    class="directory">/usr/local/lib</filename> and <filename
286    class="directory">/opt/lib</filename>, so add those directories to the
287    dynamic loader's search path.</para>
288
289    <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
290    following:</para>
291
292<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
293<literal># Begin /etc/ld.so.conf
294
295/usr/local/lib
296/opt/lib
297
298# End /etc/ld.so.conf</literal>
299EOF</userinput></screen>
300
301  </sect2>
302
303  <sect2 id="contents-glibc" role="content">
304    <title>Contents of Glibc</title>
305
306    <segmentedlist>
307      <segtitle>Installed programs</segtitle>
308      <segtitle>Installed libraries</segtitle>
309
310      <seglistitem>
311        <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
312        ldd, lddlibc4, locale, localedef, mtrace, nscd,
313        pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
314        zdump, and zic</seg>
315        <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
316        libbsd-compat.a, libc.[a,so], libcrypt.[a,so], libdl.[a,so], libg.a,
317        libieee.a, libm.[a,so], libmcheck.a, libmemusage.so, libnsl.a,
318        libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
319        libnss_nis.so, libnss_nisplus.so, libpcprofile.so, libpthread.[a,so],
320        libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so, and
321        libutil.[a,so]</seg>
322      </seglistitem>
323    </segmentedlist>
324
325    <variablelist>
326      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
327      <?dbfo list-presentation="list"?>
328      <?dbhtml list-presentation="table"?>
329
330      <varlistentry id="catchsegv">
331        <term><command>catchsegv</command></term>
332        <listitem>
333          <para>Can be used to create a stack trace when a program
334          terminates with a segmentation fault</para>
335          <indexterm zone="ch-system-glibc catchsegv">
336            <primary sortas="b-catchsegv">catchsegv</primary>
337          </indexterm>
338        </listitem>
339      </varlistentry>
340
341      <varlistentry id="gencat">
342        <term><command>gencat</command></term>
343        <listitem>
344          <para>Generates message catalogues</para>
345          <indexterm zone="ch-system-glibc gencat">
346            <primary sortas="b-gencat">gencat</primary>
347          </indexterm>
348        </listitem>
349      </varlistentry>
350
351      <varlistentry id="getconf">
352        <term><command>getconf</command></term>
353        <listitem>
354          <para>Displays the system configuration values for file system specific
355          variables</para>
356          <indexterm zone="ch-system-glibc getconf">
357            <primary sortas="b-getconf">getconf</primary>
358          </indexterm>
359        </listitem>
360      </varlistentry>
361
362      <varlistentry id="getent">
363        <term><command>getent</command></term>
364        <listitem>
365          <para>Gets entries from an administrative database</para>
366          <indexterm zone="ch-system-glibc getent">
367            <primary sortas="b-getent">getent</primary>
368          </indexterm>
369        </listitem>
370      </varlistentry>
371
372      <varlistentry id="iconv">
373        <term><command>iconv</command></term>
374        <listitem>
375          <para>Performs character set conversion</para>
376          <indexterm zone="ch-system-glibc iconv">
377            <primary sortas="b-iconv">iconv</primary>
378          </indexterm>
379        </listitem>
380      </varlistentry>
381
382      <varlistentry id="iconvconfig">
383        <term><command>iconvconfig</command></term>
384        <listitem>
385          <para>Creates fastloading <command>iconv</command> module configuration
386          files</para>
387          <indexterm zone="ch-system-glibc iconvconfig">
388            <primary sortas="b-iconvconfig">iconvconfig</primary>
389          </indexterm>
390        </listitem>
391      </varlistentry>
392
393      <varlistentry id="ldconfig">
394        <term><command>ldconfig</command></term>
395        <listitem>
396          <para>Configures the dynamic linker runtime bindings</para>
397          <indexterm zone="ch-system-glibc ldconfig">
398            <primary sortas="b-ldconfig">ldconfig</primary>
399          </indexterm>
400        </listitem>
401      </varlistentry>
402
403      <varlistentry id="ldd">
404        <term><command>ldd</command></term>
405        <listitem>
406          <para>Reports which shared libraries are required
407          by each given program or shared library</para>
408          <indexterm zone="ch-system-glibc ldd">
409            <primary sortas="b-ldd">ldd</primary>
410          </indexterm>
411        </listitem>
412      </varlistentry>
413
414      <varlistentry id="lddlibc4">
415        <term><command>lddlibc4</command></term>
416        <listitem>
417          <para>Assists <command>ldd</command> with object files</para>
418          <indexterm zone="ch-system-glibc lddlibc4">
419            <primary sortas="b-lddlibc4">lddlibc4</primary>
420          </indexterm>
421        </listitem>
422      </varlistentry>
423
424      <varlistentry id="locale">
425        <term><command>locale</command></term>
426        <listitem>
427          <para>Tells the compiler to enable or disable the use of POSIX locales
428          for built-in operations</para>
429          <indexterm zone="ch-system-glibc locale">
430            <primary sortas="b-locale">locale</primary>
431          </indexterm>
432        </listitem>
433      </varlistentry>
434
435      <varlistentry id="localedef">
436        <term><command>localedef</command></term>
437        <listitem>
438          <para>Compiles locale specifications</para>
439          <indexterm zone="ch-system-glibc localedef">
440            <primary sortas="b-localedef">localedef</primary>
441          </indexterm>
442        </listitem>
443      </varlistentry>
444
445      <varlistentry id="mtrace">
446        <term><command>mtrace</command></term>
447        <listitem>
448          <para>Reads and interprets a memory trace file and
449          displays a summary in human-readable format</para>
450          <indexterm zone="ch-system-glibc mtrace">
451            <primary sortas="b-mtrace">mtrace</primary>
452          </indexterm>
453        </listitem>
454      </varlistentry>
455
456      <varlistentry id="nscd">
457        <term><command>nscd</command></term>
458        <listitem>
459          <para>A daemon that provides a cache for the most common name
460          service requests</para>
461          <indexterm zone="ch-system-glibc nscd">
462            <primary sortas="b-nscd">nscd</primary>
463          </indexterm>
464        </listitem>
465      </varlistentry>
466
467      <varlistentry id="pcprofiledump">
468        <term><command>pcprofiledump</command></term>
469        <listitem>
470          <para>Dumps information generated by PC profiling</para>
471          <indexterm zone="ch-system-glibc pcprofiledump">
472            <primary sortas="b-pcprofiledump">pcprofiledump</primary>
473          </indexterm>
474        </listitem>
475      </varlistentry>
476
477      <varlistentry id="pt_chown">
478        <term><command>pt_chown</command></term>
479        <listitem>
480          <para>A helper program for <command>grantpt</command> to set the owner,
481          group and access permissions of a slave pseudo terminal</para>
482          <indexterm zone="ch-system-glibc pt_chown">
483            <primary sortas="b-pt_chown">pt_chown</primary>
484          </indexterm>
485        </listitem>
486      </varlistentry>
487
488      <varlistentry id="rpcgen">
489        <term><command>rpcgen</command></term>
490        <listitem>
491          <para>Generates C code to implement the Remote Procecure Call (RPC)
492          protocol</para>
493          <indexterm zone="ch-system-glibc rpcgen">
494            <primary sortas="b-rpcgen">rpcgen</primary>
495          </indexterm>
496        </listitem>
497      </varlistentry>
498
499      <varlistentry id="rpcinfo">
500        <term><command>rpcinfo</command></term>
501        <listitem>
502          <para>Makes an RPC call to an RPC server</para>
503          <indexterm zone="ch-system-glibc rpcinfo">
504            <primary sortas="b-rpcinfo">rpcinfo</primary>
505          </indexterm>
506        </listitem>
507      </varlistentry>
508
509      <varlistentry id="sln">
510        <term><command>sln</command></term>
511        <listitem>
512          <para>A statically linked <command>ln</command> program</para>
513          <indexterm zone="ch-system-glibc sln">
514            <primary sortas="b-sln">sln</primary>
515          </indexterm>
516        </listitem>
517      </varlistentry>
518
519      <varlistentry id="sprof">
520        <term><command>sprof</command></term>
521        <listitem>
522          <para>Reads and displays shared object profiling data</para>
523          <indexterm zone="ch-system-glibc sprof">
524            <primary sortas="b-sprof">sprof</primary>
525          </indexterm>
526        </listitem>
527      </varlistentry>
528
529      <varlistentry id="tzselect">
530        <term><command>tzselect</command></term>
531        <listitem>
532          <para>Asks the user about the location of the
533          system and reports the corresponding time zone description</para>
534          <indexterm zone="ch-system-glibc tzselect">
535            <primary sortas="b-tzselect">tzselect</primary>
536          </indexterm>
537        </listitem>
538      </varlistentry>
539
540      <varlistentry id="xtrace">
541        <term><command>xtrace</command></term>
542        <listitem>
543          <para>Traces the execution of a program by
544          printing the currently executed function</para>
545          <indexterm zone="ch-system-glibc xtrace">
546            <primary sortas="b-xtrace">xtrace</primary>
547          </indexterm>
548        </listitem>
549      </varlistentry>
550
551      <varlistentry id="zdump">
552        <term><command>zdump</command></term>
553        <listitem>
554          <para>The time zone dumper</para>
555          <indexterm zone="ch-system-glibc zdump">
556            <primary sortas="b-zdump">zdump</primary>
557          </indexterm>
558        </listitem>
559      </varlistentry>
560
561      <varlistentry id="zic">
562        <term><command>zic</command></term>
563        <listitem>
564          <para>The time zone compiler</para>
565          <indexterm zone="ch-system-glibc zic">
566            <primary sortas="b-zic">zic</primary>
567          </indexterm>
568        </listitem>
569      </varlistentry>
570
571      <varlistentry id="ld.so">
572        <term><filename class="libraryfile">ld.so</filename></term>
573        <listitem>
574          <para>The helper program for shared library executables</para>
575          <indexterm zone="ch-system-glibc ld.so">
576            <primary sortas="c-ld.so">ld.so</primary>
577          </indexterm>
578        </listitem>
579      </varlistentry>
580
581      <varlistentry id="libBrokenLocale">
582        <term><filename class="libraryfile">libBrokenLocale</filename></term>
583        <listitem>
584          <para>Used by programs, such as Mozilla, to solve broken locales</para>
585          <indexterm zone="ch-system-glibc libBrokenLocale">
586            <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
587          </indexterm>
588        </listitem>
589      </varlistentry>
590
591      <varlistentry id="libSegFault">
592        <term><filename class="libraryfile">libSegFault</filename></term>
593        <listitem>
594          <para>The segmentation fault signal handler</para>
595          <indexterm zone="ch-system-glibc libSegFault">
596            <primary sortas="c-libSegFault">libSegFault</primary>
597          </indexterm>
598        </listitem>
599      </varlistentry>
600
601      <varlistentry id="libanl">
602        <term><filename class="libraryfile">libanl</filename></term>
603        <listitem>
604          <para>An asynchronous name lookup library</para>
605          <indexterm zone="ch-system-glibc libanl">
606            <primary sortas="c-libanl">libanl</primary>
607          </indexterm>
608        </listitem>
609      </varlistentry>
610
611      <varlistentry id="libbsd-compat">
612        <term><filename class="libraryfile">libbsd-compat</filename></term>
613        <listitem>
614          <para>Provides the portability needed
615          in order to run certain Berkey Software Distribution (BSD) programs
616          under Linux</para>
617          <indexterm zone="ch-system-glibc libbsd-compat">
618            <primary sortas="c-libbsd-compat">libbsd-compat</primary>
619          </indexterm>
620        </listitem>
621      </varlistentry>
622
623      <varlistentry id="libc">
624        <term><filename class="libraryfile">libc</filename></term>
625        <listitem>
626          <para>The main C library</para>
627          <indexterm zone="ch-system-glibc libc">
628            <primary sortas="c-libc">libc</primary>
629          </indexterm>
630        </listitem>
631      </varlistentry>
632
633      <varlistentry id="libcrypt">
634        <term><filename class="libraryfile">libcrypt</filename></term>
635        <listitem>
636          <para>The cryptography library</para>
637          <indexterm zone="ch-system-glibc libcrypt">
638            <primary sortas="c-libcrypt">libcrypt</primary>
639          </indexterm>
640        </listitem>
641      </varlistentry>
642
643      <varlistentry id="libdl">
644        <term><filename class="libraryfile">libdl</filename></term>
645        <listitem>
646          <para>The dynamic linking interface library</para>
647          <indexterm zone="ch-system-glibc libdl">
648            <primary sortas="c-libdl">libdl</primary>
649          </indexterm>
650        </listitem>
651      </varlistentry>
652
653      <varlistentry id="libg">
654        <term><filename class="libraryfile">libg</filename></term>
655        <listitem>
656          <para>A runtime library for <command>g++</command></para>
657          <indexterm zone="ch-system-glibc libg">
658            <primary sortas="c-libg">libg</primary>
659          </indexterm>
660        </listitem>
661      </varlistentry>
662
663      <varlistentry id="libieee">
664        <term><filename class="libraryfile">libieee</filename></term>
665        <listitem>
666          <para>The Institute of Electrical and Electronic Engineers (IEEE)
667          floating point library</para>
668          <indexterm zone="ch-system-glibc libieee">
669            <primary sortas="c-libieee">libieee</primary>
670          </indexterm>
671        </listitem>
672      </varlistentry>
673
674      <varlistentry id="libm">
675        <term><filename class="libraryfile">libm</filename></term>
676        <listitem>
677          <para>The mathematical library</para>
678          <indexterm zone="ch-system-glibc libm">
679            <primary sortas="c-libm">libm</primary>
680          </indexterm>
681        </listitem>
682      </varlistentry>
683
684      <varlistentry id="libmcheck">
685        <term><filename class="libraryfile">libmcheck</filename></term>
686        <listitem>
687          <para>Contains code run at boot</para>
688          <indexterm zone="ch-system-glibc libmcheck">
689            <primary sortas="c-libmcheck">libmcheck</primary>
690          </indexterm>
691        </listitem>
692      </varlistentry>
693
694      <varlistentry id="libmemusage">
695        <term><filename class="libraryfile">libmemusage</filename></term>
696        <listitem>
697          <para>Used by <command>memusage</command> to help collect
698          information about the memory usage of a program</para>
699          <indexterm zone="ch-system-glibc libmemusage">
700            <primary sortas="c-libmemusage">libmemusage</primary>
701          </indexterm>
702        </listitem>
703      </varlistentry>
704
705      <varlistentry id="libnsl">
706        <term><filename class="libraryfile">libnsl</filename></term>
707        <listitem>
708          <para>The network services library</para>
709          <indexterm zone="ch-system-glibc libnsl">
710            <primary sortas="c-libnsl">libnsl</primary>
711          </indexterm>
712        </listitem>
713      </varlistentry>
714
715      <varlistentry id="libnss">
716        <term><filename class="libraryfile">libnss</filename></term>
717        <listitem>
718          <para>The Name Service Switch libraries, containing functions for
719          resolving host names, user names, group names, aliases, services,
720          protocols, etc.</para>
721          <indexterm zone="ch-system-glibc libnss">
722            <primary sortas="c-libnss">libnss</primary>
723          </indexterm>
724        </listitem>
725      </varlistentry>
726
727      <varlistentry id="libpcprofile">
728        <term><filename class="libraryfile">libpcprofile</filename></term>
729        <listitem>
730          <para>Contains profiling functions used to track the amount of CPU
731          time spent in specific source code lines</para>
732          <indexterm zone="ch-system-glibc libpcprofile">
733            <primary sortas="c-libpcprofile">libpcprofile</primary>
734          </indexterm>
735        </listitem>
736      </varlistentry>
737
738      <varlistentry id="libpthread">
739        <term><filename class="libraryfile">libpthread</filename></term>
740        <listitem>
741          <para>The POSIX threads library</para>
742          <indexterm zone="ch-system-glibc libpthread">
743            <primary sortas="c-libpthread">libpthread</primary>
744          </indexterm>
745        </listitem>
746      </varlistentry>
747
748      <varlistentry id="libresolv">
749        <term><filename class="libraryfile">libresolv</filename></term>
750        <listitem>
751          <para>Contains functions for creating, sending, and interpreting
752          packets to the Internet domain name servers</para>
753          <indexterm zone="ch-system-glibc libresolv">
754            <primary sortas="c-libresolv">libresolv</primary>
755          </indexterm>
756        </listitem>
757      </varlistentry>
758
759      <varlistentry id="librpcsvc">
760        <term><filename class="libraryfile">librpcsvc</filename></term>
761        <listitem>
762          <para>Contains functions providing miscellaneous RPC services</para>
763          <indexterm zone="ch-system-glibc librpcsvc">
764            <primary sortas="c-librpcsvc">librpcsvc</primary>
765          </indexterm>
766        </listitem>
767      </varlistentry>
768
769      <varlistentry id="librt">
770        <term><filename class="libraryfile">librt</filename></term>
771        <listitem>
772          <para>Contains functions providing most of the interfaces specified by
773          the POSIX.1b Realtime Extension</para>
774          <indexterm zone="ch-system-glibc librt">
775            <primary sortas="c-librt">librt</primary>
776          </indexterm>
777        </listitem>
778      </varlistentry>
779
780      <varlistentry id="libthread_db">
781        <term><filename class="libraryfile">libthread_db</filename></term>
782        <listitem>
783          <para>Contains functions useful for
784          building debuggers for multi-threaded programs</para>
785          <indexterm zone="ch-system-glibc libthread_db">
786            <primary sortas="c-libthread_db">libthread_db</primary>
787          </indexterm>
788        </listitem>
789      </varlistentry>
790
791      <varlistentry id="libutil">
792        <term><filename class="libraryfile">libutil</filename></term>
793        <listitem>
794          <para>Contains code for <quote>standard</quote> functions used in
795          many different Unix utilities</para>
796          <indexterm zone="ch-system-glibc libutil">
797            <primary sortas="c-libutil">libutil</primary>
798          </indexterm>
799        </listitem>
800      </varlistentry>
801
802    </variablelist>
803
804  </sect2>
805
806</sect1>
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