source: BOOK/final-system/common/eglibc.xml @ c8d4414

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
Last change on this file since c8d4414 was c8d4414, checked in by Joe Ciccone <jciccone@…>, 14 years ago

Add a patch to EGlibc to fix a compatibility issue with Make 3.82.
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File size: 31.5 KB
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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-eglibc" role="wrap">
9  <?dbhtml filename="eglibc.html"?>
10
11  <title>EGLIBC-&eglibc-version;</title>
12
13  <indexterm zone="ch-system-eglibc">
14    <primary sortas="a-EGLIBC">EGLIBC</primary>
15  </indexterm>
16
17  <sect2 role="package">
18    <title/>
19
20    <para>The EGLIBC 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 EGLIBC</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> EGLIBC 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="mp1">The following patch fixes a compatibility issue with Make
42    3.82 and newer.</para>
43
44<screen os="mp2"><userinput>patch -Np1 -i ../&eglibc-make382-patch;</userinput></screen>
45
46    <para os="l3">The following sed makes sure that newly built EGLIBC is tested,
47    during make install, instead of the one we previously build:</para>
48
49<screen os="l4"><userinput>LINKER=$(readelf -l $(file /tools/lib/libc-* | cut -f1 -d:) | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
50sed -i "s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=${LINKER} -o|" \
51  scripts/test-installation.pl
52unset LINKER</userinput></screen>
53
54    <para os="b">The EGLIBC build system is self-contained and will install
55    perfectly, even though the compiler specs file and linker are still
56    pointing at <filename class="directory">/tools</filename>. The specs
57    and linker cannot be adjusted before the EGLIBC install because the
58    EGLIBC Autoconf tests would give false results and defeat the goal
59    of achieving a clean build.</para>
60
61    <para os="e">The EGLIBC documentation recommends building EGLIBC outside of the
62    source directory in a dedicated build directory:</para>
63
64<screen os="f"><userinput>mkdir -v ../eglibc-build
65cd ../eglibc-build</userinput></screen>
66
67    <para os="g">Prepare EGLIBC for compilation:</para>
68
69<screen os="h"><userinput>../eglibc-&eglibc-version;/configure --prefix=/usr \
70    --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
71    --libexecdir=/usr/lib/eglibc</userinput></screen>
72
73    <variablelist os="i">
74      <title>The meaning of the new configure option:</title>
75
76      <varlistentry>
77        <term><parameter>--libexecdir=/usr/lib/eglibc</parameter></term>
78        <listitem>
79          <para>This changes the location of the <command>pt_chown</command>
80          program from its default of <filename
81          class="directory">/usr/libexec</filename> to <filename
82          class="directory">/usr/lib/eglibc</filename>.</para>
83        </listitem>
84      </varlistentry>
85    </variablelist>
86
87    <para os="j">Compile the package:</para>
88
89<screen os="k"><userinput>make</userinput></screen>
90
91    <important os="l">
92      <para>The test suite for EGLIBC is considered critical.
93      Do not skip it under any circumstance.</para>
94    </important>
95
96    <para os="m">Before running the tests, copy a file from the source tree into our
97    build tree to prevent a couple of test failures, then run the tests:</para>
98
99<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
100
101<screen os="n"><userinput>cp -v ../eglibc-&eglibc-version;/iconvdata/gconv-modules iconvdata
102make -k check &gt;eglibc-check-log 2&gt;&amp;1 ; grep Error eglibc-check-log</userinput></screen>
103
104    <para os="o">The EGLIBC test suite is highly dependent on certain functions of
105    the host system, in particular the kernel. The posix/annexc test normally fails
106    and you should see <literal>Error 1 (ignored)</literal> in the output. Apart
107    from this, the EGLIBC test suite is always expected to pass. However, in certain
108    circumstances, some failures are unavoidable. If a test fails because of a missing
109    program (or missing symbolic link), or a segfault, you will see an error code
110    greater than 127 and the details will be in the log. More commonly, tests will
111    fail with <literal>Error 2</literal> - for these, the contents of the corresponding
112    <filename>.out</filename> file, e.g. <filename>posix/annexc.out</filename> may be
113    informative. Here is a list of the most common issues:</para>
114
115    <itemizedlist os="p">
116      <listitem>
117        <para>The <emphasis>math</emphasis> tests sometimes fail.
118        Certain optimization settings are known to be a
119        factor here.</para>
120      </listitem>
121      <listitem>
122        <para>If you have mounted the CLFS partition with the
123        <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
124        will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
125        do not use the <parameter>noatime</parameter> option while building
126        CLFS.</para>
127      </listitem>
128      <listitem>
129        <para>When running on older and slower hardware, some tests
130        can fail because of test timeouts being exceeded.</para>
131      </listitem>
132    </itemizedlist>
133
134    <para os="q">Though it is a harmless message, the install stage of EGLIBC will
135    complain about the absence of <filename>/etc/ld.so.conf</filename>.
136    Prevent this warning with:</para>
137
138<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
139
140    <para os="s">Install the package:</para>
141
142<screen os="t"><userinput>make install</userinput></screen>
143
144  </sect2>
145
146  <sect2 id="i18n-eglibc" role="configuration">
147    <title>Internationalization</title>
148
149    <para>The locales that can make the system respond in a different
150    language were not installed by the above command. Install them
151    with:</para>
152
153<screen><userinput>make localedata/install-locales</userinput></screen>
154
155    <para>To save time, an alternative to running the previous command (which
156    generates and installs every locale listed in the
157    <filename>eglibc-&eglibc-version;/localedata/SUPPORTED</filename> file) is
158    to install only those locales that are wanted and needed. This can be
159    achieved by using the <command>localedef</command> command. Information on
160    this command is located in the <filename>INSTALL</filename> file in the
161    EGLIBC source. However, there are a number of locales that are essential in
162    order for the tests of future packages to pass, in particular, the
163    <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
164    instead of the <parameter>install-locales</parameter> target used above,
165    will install the minimum set of locales necessary for the tests to run
166    successfully:</para>
167
168<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
169localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
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 CLFS and CBLFS. Because
185    of the various problems that arise due to application programmers making
186    assumptions that break in such locales, CLFS 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 CLFS 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-eglibc" role="configuration">
200    <title>Configuring EGLIBC</title>
201
202    <indexterm zone="conf-eglibc">
203      <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
204    </indexterm>
205
206    <indexterm zone="conf-eglibc">
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 EGLIBC provides defaults when this file is missing or
212    corrupt, the EGLIBC 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 os="ld-a">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 os="ld-b">Create a new file <filename>/etc/ld.so.conf</filename> by running the
290    following:</para>
291
292<screen os="ld-c"><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-eglibc" role="content">
304    <title>Contents of EGLIBC</title>
305
306    <segmentedlist>
307      <segtitle>Installed programs</segtitle>
308      <segtitle>Installed libraries</segtitle>
309      <segtitle>Installed directories</segtitle>
310
311      <seglistitem>
312        <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
313        ldd, lddlibc4, locale, localedef, mtrace, nscd,
314        pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
315        zdump, and zic</seg>
316        <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
317        libbsd-compat.a, libc.[a,so], libc_nonshared.a, libcidn.[a,so],
318        libcrypt.[a,so], libdl.[a,so], libg.a, libieee.a, libm.[a,so],
319        libmcheck.a, libmemusage.so, libnsl.a, libnss_compat.so, libnss_dns.so,
320        libnss_files.so, libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so,
321        libpcprofile.so, libpthread.[a,so], libpthread_nonshared.a,
322        libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so, and
323        libutil.[a,so]</seg>
324        <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
325        /usr/include/net, /usr/include/netash, /usr/include/netatalk,
326        /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
327        /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
328        /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
329        /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
330        /usr/include/sys, /usr/lib/gconv, /usr/lib/eglibc, /usr/lib/locale,
331        /usr/share/i18n, /usr/share/zoneinfo, /var/cache/ldconfig</seg>
332      </seglistitem>
333    </segmentedlist>
334
335    <variablelist>
336      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
337      <?dbfo list-presentation="list"?>
338      <?dbhtml list-presentation="table"?>
339
340      <varlistentry id="catchsegv">
341        <term><command>catchsegv</command></term>
342        <listitem>
343          <para>Can be used to create a stack trace when a program
344          terminates with a segmentation fault</para>
345          <indexterm zone="ch-system-eglibc catchsegv">
346            <primary sortas="b-catchsegv">catchsegv</primary>
347          </indexterm>
348        </listitem>
349      </varlistentry>
350
351      <varlistentry id="gencat">
352        <term><command>gencat</command></term>
353        <listitem>
354          <para>Generates message catalogues</para>
355          <indexterm zone="ch-system-eglibc gencat">
356            <primary sortas="b-gencat">gencat</primary>
357          </indexterm>
358        </listitem>
359      </varlistentry>
360
361      <varlistentry id="getconf">
362        <term><command>getconf</command></term>
363        <listitem>
364          <para>Displays the system configuration values for file system specific
365          variables</para>
366          <indexterm zone="ch-system-eglibc getconf">
367            <primary sortas="b-getconf">getconf</primary>
368          </indexterm>
369        </listitem>
370      </varlistentry>
371
372      <varlistentry id="getent">
373        <term><command>getent</command></term>
374        <listitem>
375          <para>Gets entries from an administrative database</para>
376          <indexterm zone="ch-system-eglibc getent">
377            <primary sortas="b-getent">getent</primary>
378          </indexterm>
379        </listitem>
380      </varlistentry>
381
382      <varlistentry id="iconv">
383        <term><command>iconv</command></term>
384        <listitem>
385          <para>Performs character set conversion</para>
386          <indexterm zone="ch-system-eglibc iconv">
387            <primary sortas="b-iconv">iconv</primary>
388          </indexterm>
389        </listitem>
390      </varlistentry>
391
392      <varlistentry id="iconvconfig">
393        <term><command>iconvconfig</command></term>
394        <listitem>
395          <para>Creates fastloading <command>iconv</command> module configuration
396          files</para>
397          <indexterm zone="ch-system-eglibc iconvconfig">
398            <primary sortas="b-iconvconfig">iconvconfig</primary>
399          </indexterm>
400        </listitem>
401      </varlistentry>
402
403      <varlistentry id="ldconfig">
404        <term><command>ldconfig</command></term>
405        <listitem>
406          <para>Configures the dynamic linker runtime bindings</para>
407          <indexterm zone="ch-system-eglibc ldconfig">
408            <primary sortas="b-ldconfig">ldconfig</primary>
409          </indexterm>
410        </listitem>
411      </varlistentry>
412
413      <varlistentry id="ldd">
414        <term><command>ldd</command></term>
415        <listitem>
416          <para>Reports which shared libraries are required
417          by each given program or shared library</para>
418          <indexterm zone="ch-system-eglibc ldd">
419            <primary sortas="b-ldd">ldd</primary>
420          </indexterm>
421        </listitem>
422      </varlistentry>
423
424      <varlistentry id="lddlibc4">
425        <term><command>lddlibc4</command></term>
426        <listitem>
427          <para>Assists <command>ldd</command> with object files</para>
428          <indexterm zone="ch-system-eglibc lddlibc4">
429            <primary sortas="b-lddlibc4">lddlibc4</primary>
430          </indexterm>
431        </listitem>
432      </varlistentry>
433
434      <varlistentry id="locale">
435        <term><command>locale</command></term>
436        <listitem>
437          <para>Tells the compiler to enable or disable the use of POSIX locales
438          for built-in operations</para>
439          <indexterm zone="ch-system-eglibc locale">
440            <primary sortas="b-locale">locale</primary>
441          </indexterm>
442        </listitem>
443      </varlistentry>
444
445      <varlistentry id="localedef">
446        <term><command>localedef</command></term>
447        <listitem>
448          <para>Compiles locale specifications</para>
449          <indexterm zone="ch-system-eglibc localedef">
450            <primary sortas="b-localedef">localedef</primary>
451          </indexterm>
452        </listitem>
453      </varlistentry>
454
455      <varlistentry id="mtrace">
456        <term><command>mtrace</command></term>
457        <listitem>
458          <para>Reads and interprets a memory trace file and
459          displays a summary in human-readable format</para>
460          <indexterm zone="ch-system-eglibc mtrace">
461            <primary sortas="b-mtrace">mtrace</primary>
462          </indexterm>
463        </listitem>
464      </varlistentry>
465
466      <varlistentry id="nscd">
467        <term><command>nscd</command></term>
468        <listitem>
469          <para>A daemon that provides a cache for the most common name
470          service requests</para>
471          <indexterm zone="ch-system-eglibc nscd">
472            <primary sortas="b-nscd">nscd</primary>
473          </indexterm>
474        </listitem>
475      </varlistentry>
476
477      <varlistentry id="pcprofiledump">
478        <term><command>pcprofiledump</command></term>
479        <listitem>
480          <para>Dumps information generated by PC profiling</para>
481          <indexterm zone="ch-system-eglibc pcprofiledump">
482            <primary sortas="b-pcprofiledump">pcprofiledump</primary>
483          </indexterm>
484        </listitem>
485      </varlistentry>
486
487      <varlistentry id="pt_chown">
488        <term><command>pt_chown</command></term>
489        <listitem>
490          <para>A helper program for <command>grantpt</command> to set the owner,
491          group and access permissions of a slave pseudo terminal</para>
492          <indexterm zone="ch-system-eglibc pt_chown">
493            <primary sortas="b-pt_chown">pt_chown</primary>
494          </indexterm>
495        </listitem>
496      </varlistentry>
497
498      <varlistentry id="rpcgen">
499        <term><command>rpcgen</command></term>
500        <listitem>
501          <para>Generates C code to implement the Remote Procecure Call (RPC)
502          protocol</para>
503          <indexterm zone="ch-system-eglibc rpcgen">
504            <primary sortas="b-rpcgen">rpcgen</primary>
505          </indexterm>
506        </listitem>
507      </varlistentry>
508
509      <varlistentry id="rpcinfo">
510        <term><command>rpcinfo</command></term>
511        <listitem>
512          <para>Makes an RPC call to an RPC server</para>
513          <indexterm zone="ch-system-eglibc rpcinfo">
514            <primary sortas="b-rpcinfo">rpcinfo</primary>
515          </indexterm>
516        </listitem>
517      </varlistentry>
518
519      <varlistentry id="sln">
520        <term><command>sln</command></term>
521        <listitem>
522          <para>A statically linked program that creates symbolic links</para>
523          <indexterm zone="ch-system-eglibc sln">
524            <primary sortas="b-sln">sln</primary>
525          </indexterm>
526        </listitem>
527      </varlistentry>
528
529      <varlistentry id="sprof">
530        <term><command>sprof</command></term>
531        <listitem>
532          <para>Reads and displays shared object profiling data</para>
533          <indexterm zone="ch-system-eglibc sprof">
534            <primary sortas="b-sprof">sprof</primary>
535          </indexterm>
536        </listitem>
537      </varlistentry>
538
539      <varlistentry id="tzselect">
540        <term><command>tzselect</command></term>
541        <listitem>
542          <para>Asks the user about the location of the
543          system and reports the corresponding time zone description</para>
544          <indexterm zone="ch-system-eglibc tzselect">
545            <primary sortas="b-tzselect">tzselect</primary>
546          </indexterm>
547        </listitem>
548      </varlistentry>
549
550      <varlistentry id="xtrace">
551        <term><command>xtrace</command></term>
552        <listitem>
553          <para>Traces the execution of a program by
554          printing the currently executed function</para>
555          <indexterm zone="ch-system-eglibc xtrace">
556            <primary sortas="b-xtrace">xtrace</primary>
557          </indexterm>
558        </listitem>
559      </varlistentry>
560
561      <varlistentry id="zdump">
562        <term><command>zdump</command></term>
563        <listitem>
564          <para>The time zone dumper</para>
565          <indexterm zone="ch-system-eglibc zdump">
566            <primary sortas="b-zdump">zdump</primary>
567          </indexterm>
568        </listitem>
569      </varlistentry>
570
571      <varlistentry id="zic">
572        <term><command>zic</command></term>
573        <listitem>
574          <para>The time zone compiler</para>
575          <indexterm zone="ch-system-eglibc zic">
576            <primary sortas="b-zic">zic</primary>
577          </indexterm>
578        </listitem>
579      </varlistentry>
580
581      <varlistentry id="ld.so">
582        <term><filename class="libraryfile">ld.so</filename></term>
583        <listitem>
584          <para>The helper program for shared library executables</para>
585          <indexterm zone="ch-system-eglibc ld.so">
586            <primary sortas="c-ld.so">ld.so</primary>
587          </indexterm>
588        </listitem>
589      </varlistentry>
590
591      <varlistentry id="libBrokenLocale">
592        <term><filename class="libraryfile">libBrokenLocale</filename></term>
593        <listitem>
594          <para>Used by programs, such as Mozilla, to solve broken locales</para>
595          <indexterm zone="ch-system-eglibc libBrokenLocale">
596            <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
597          </indexterm>
598        </listitem>
599      </varlistentry>
600
601      <varlistentry id="libSegFault">
602        <term><filename class="libraryfile">libSegFault</filename></term>
603        <listitem>
604          <para>The segmentation fault signal handler</para>
605          <indexterm zone="ch-system-eglibc libSegFault">
606            <primary sortas="c-libSegFault">libSegFault</primary>
607          </indexterm>
608        </listitem>
609      </varlistentry>
610
611      <varlistentry id="libanl">
612        <term><filename class="libraryfile">libanl</filename></term>
613        <listitem>
614          <para>An asynchronous name lookup library</para>
615          <indexterm zone="ch-system-eglibc libanl">
616            <primary sortas="c-libanl">libanl</primary>
617          </indexterm>
618        </listitem>
619      </varlistentry>
620
621      <varlistentry id="libbsd-compat">
622        <term><filename class="libraryfile">libbsd-compat</filename></term>
623        <listitem>
624          <para>Provides the portability needed
625          in order to run certain Berkey Software Distribution (BSD) programs
626          under Linux</para>
627          <indexterm zone="ch-system-eglibc libbsd-compat">
628            <primary sortas="c-libbsd-compat">libbsd-compat</primary>
629          </indexterm>
630        </listitem>
631      </varlistentry>
632
633      <varlistentry id="libc">
634        <term><filename class="libraryfile">libc</filename></term>
635        <listitem>
636          <para>The main C library</para>
637          <indexterm zone="ch-system-eglibc libc">
638            <primary sortas="c-libc">libc</primary>
639          </indexterm>
640        </listitem>
641      </varlistentry>
642
643      <varlistentry id="libcidn">
644        <term><filename class="libraryfile">libcidn</filename></term>
645        <listitem>
646          <para>Used internally by EGLIBC for handling internationalized domain
647          names in the <function>getaddrinfo()</function> function</para>
648          <indexterm zone="ch-system-eglibc libcidn">
649            <primary sortas="c-libcidn">libcidn</primary>
650          </indexterm>
651        </listitem>
652      </varlistentry>
653
654      <varlistentry id="libcrypt">
655        <term><filename class="libraryfile">libcrypt</filename></term>
656        <listitem>
657          <para>The cryptography library</para>
658          <indexterm zone="ch-system-eglibc libcrypt">
659            <primary sortas="c-libcrypt">libcrypt</primary>
660          </indexterm>
661        </listitem>
662      </varlistentry>
663
664      <varlistentry id="libdl">
665        <term><filename class="libraryfile">libdl</filename></term>
666        <listitem>
667          <para>The dynamic linking interface library</para>
668          <indexterm zone="ch-system-eglibc libdl">
669            <primary sortas="c-libdl">libdl</primary>
670          </indexterm>
671        </listitem>
672      </varlistentry>
673
674      <varlistentry id="libg">
675        <term><filename class="libraryfile">libg</filename></term>
676        <listitem>
677          <para>A runtime library for <command>g++</command></para>
678          <indexterm zone="ch-system-eglibc libg">
679            <primary sortas="c-libg">libg</primary>
680          </indexterm>
681        </listitem>
682      </varlistentry>
683
684      <varlistentry id="libieee">
685        <term><filename class="libraryfile">libieee</filename></term>
686        <listitem>
687          <para>The Institute of Electrical and Electronic Engineers (IEEE)
688          floating point library</para>
689          <indexterm zone="ch-system-eglibc libieee">
690            <primary sortas="c-libieee">libieee</primary>
691          </indexterm>
692        </listitem>
693      </varlistentry>
694
695      <varlistentry id="libm">
696        <term><filename class="libraryfile">libm</filename></term>
697        <listitem>
698          <para>The mathematical library</para>
699          <indexterm zone="ch-system-eglibc libm">
700            <primary sortas="c-libm">libm</primary>
701          </indexterm>
702        </listitem>
703      </varlistentry>
704
705      <varlistentry id="libmcheck">
706        <term><filename class="libraryfile">libmcheck</filename></term>
707        <listitem>
708          <para>Contains code run at boot</para>
709          <indexterm zone="ch-system-eglibc libmcheck">
710            <primary sortas="c-libmcheck">libmcheck</primary>
711          </indexterm>
712        </listitem>
713      </varlistentry>
714
715      <varlistentry id="libmemusage">
716        <term><filename class="libraryfile">libmemusage</filename></term>
717        <listitem>
718          <para>Used by <command>memusage</command> (included in EGLIBC, but
719          not built in a base CLFS system as it has additional dependencies)
720          to help collect information about the memory usage of a program</para>
721          <indexterm zone="ch-system-eglibc libmemusage">
722            <primary sortas="c-libmemusage">libmemusage</primary>
723          </indexterm>
724        </listitem>
725      </varlistentry>
726
727      <varlistentry id="libnsl">
728        <term><filename class="libraryfile">libnsl</filename></term>
729        <listitem>
730          <para>The network services library</para>
731          <indexterm zone="ch-system-eglibc libnsl">
732            <primary sortas="c-libnsl">libnsl</primary>
733          </indexterm>
734        </listitem>
735      </varlistentry>
736
737      <varlistentry id="libnss">
738        <term><filename class="libraryfile">libnss</filename></term>
739        <listitem>
740          <para>The Name Service Switch libraries, containing functions for
741          resolving host names, user names, group names, aliases, services,
742          protocols, etc.</para>
743          <indexterm zone="ch-system-eglibc libnss">
744            <primary sortas="c-libnss">libnss</primary>
745          </indexterm>
746        </listitem>
747      </varlistentry>
748
749      <varlistentry id="libpcprofile">
750        <term><filename class="libraryfile">libpcprofile</filename></term>
751        <listitem>
752          <para>Contains profiling functions used to track the amount of CPU
753          time spent in specific source code lines</para>
754          <indexterm zone="ch-system-eglibc libpcprofile">
755            <primary sortas="c-libpcprofile">libpcprofile</primary>
756          </indexterm>
757        </listitem>
758      </varlistentry>
759
760      <varlistentry id="libpthread">
761        <term><filename class="libraryfile">libpthread</filename></term>
762        <listitem>
763          <para>The POSIX threads library</para>
764          <indexterm zone="ch-system-eglibc libpthread">
765            <primary sortas="c-libpthread">libpthread</primary>
766          </indexterm>
767        </listitem>
768      </varlistentry>
769
770      <varlistentry id="libresolv">
771        <term><filename class="libraryfile">libresolv</filename></term>
772        <listitem>
773          <para>Contains functions for creating, sending, and interpreting
774          packets to the Internet domain name servers</para>
775          <indexterm zone="ch-system-eglibc libresolv">
776            <primary sortas="c-libresolv">libresolv</primary>
777          </indexterm>
778        </listitem>
779      </varlistentry>
780
781      <varlistentry id="librpcsvc">
782        <term><filename class="libraryfile">librpcsvc</filename></term>
783        <listitem>
784          <para>Contains functions providing miscellaneous RPC services</para>
785          <indexterm zone="ch-system-eglibc librpcsvc">
786            <primary sortas="c-librpcsvc">librpcsvc</primary>
787          </indexterm>
788        </listitem>
789      </varlistentry>
790
791      <varlistentry id="librt">
792        <term><filename class="libraryfile">librt</filename></term>
793        <listitem>
794          <para>Contains functions providing most of the interfaces specified by
795          the POSIX.1b Realtime Extension</para>
796          <indexterm zone="ch-system-eglibc librt">
797            <primary sortas="c-librt">librt</primary>
798          </indexterm>
799        </listitem>
800      </varlistentry>
801
802      <varlistentry id="libthread_db">
803        <term><filename class="libraryfile">libthread_db</filename></term>
804        <listitem>
805          <para>Contains functions useful for
806          building debuggers for multi-threaded programs</para>
807          <indexterm zone="ch-system-eglibc libthread_db">
808            <primary sortas="c-libthread_db">libthread_db</primary>
809          </indexterm>
810        </listitem>
811      </varlistentry>
812
813      <varlistentry id="libutil">
814        <term><filename class="libraryfile">libutil</filename></term>
815        <listitem>
816          <para>Contains code for <quote>standard</quote> functions used in
817          many different Unix utilities</para>
818          <indexterm zone="ch-system-eglibc libutil">
819            <primary sortas="c-libutil">libutil</primary>
820          </indexterm>
821        </listitem>
822      </varlistentry>
823
824    </variablelist>
825
826  </sect2>
827
828</sect1>
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