source: BOOK/final-system/common/glibc.xml @ eb21c92

clfs-3.0.0-sysvinitsysvinit
Last change on this file since eb21c92 was eb21c92, checked in by Chris Staub <chris@…>, 8 years ago

Make testsuite notes slightly less strongly worded

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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-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="l1">At the end of the installation, the build system will run
42    a sanity test to make sure everything installed properly. This script will
43    attempt to test for a library that is only used in the test suite and is
44    never installed. Prevent the script from testing for this library with the
45    following command:</para>
46
47<screen os="l2"><userinput>sed -i 's/\(&amp;&amp; $name ne\) "db1"/ &amp; \1 "nss_test1"/' scripts/test-installation.pl</userinput></screen>
48
49    <para os="l3">This same script performs its tests by attempting to compile
50    test programs against certain libraries. However it does not specify the
51    path to <filename class="libraryfile">ld.so</filename>, and our toolchain
52    is still configured to use the one in
53    <filename class="directory">/tools</filename>. The following set of
54    commands will force the script to use the complete path of the new
55    <filename class="libraryfile">ld.so</filename> that was just installed:</para>
56
57<screen os="l4"><userinput>LINKER=$(readelf -l /tools/bin/bash | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
58sed -i "s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=${LINKER} -o|" \
59  scripts/test-installation.pl
60unset LINKER</userinput></screen>
61
62    <para os="b">The Glibc build system is self-contained and will install
63    perfectly, even though the compiler specs file and linker are still
64    pointing at <filename class="directory">/tools</filename>. The specs
65    and linker cannot be adjusted before the Glibc install because the
66    Glibc Autoconf tests would give false results and defeat the goal
67    of achieving a clean build.</para>
68
69    <para os="s1">Apply the following <command>sed</command> so the
70    <command>tzselect</command> script works properly:</para>
71
72<screen os="s2"><userinput>sed -i 's/\\$$(pwd)/`pwd`/' timezone/Makefile</userinput></screen>
73
74    <para os="e">The Glibc documentation recommends building Glibc outside of     the source directory in a dedicated build directory:</para>
75
76<screen os="f"><userinput>mkdir -v ../glibc-build
77cd ../glibc-build</userinput></screen>
78
79    <para os="g">Prepare Glibc for compilation:</para>
80
81<screen os="h"><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
82    --disable-profile --enable-kernel=&glibc-kernel-version; --libexecdir=/usr/lib/glibc \
83    --enable-obsolete-rpc</userinput></screen>
84
85    <variablelist os="i">
86      <title>The meaning of the new configure option:</title>
87
88      <varlistentry>
89        <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
90        <listitem>
91          <para>This changes the location of the <command>getconf</command>
92          utility from its default of <filename
93          class="directory">/usr/libexec</filename> to <filename
94          class="directory">/usr/lib/glibc</filename>.</para>
95        </listitem>
96      </varlistentry>
97    </variablelist>
98
99    <para os="j">Compile the package:</para>
100
101<screen os="k"><userinput>make</userinput></screen>
102
103    <important os="l">
104      <para>Due to Glibc's critical role in a properly functioning system,
105      the CLFS developers strongly recommend running the testsuite.</para>
106    </important>
107
108    <para os="m">Use the following commands to run the test suite and output
109    any test failures:</para>
110
111<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
112
113<screen os="n"><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log; grep Error glibc-check-log</userinput></screen>
114
115    <para os="o">The Glibc test suite is highly dependent on certain functions of
116    the host system, in particular the kernel. The <emphasis>posix/annexc</emphasis> and
117    <emphasis>conform/run-conformtest</emphasis> tests normally fail
118    and you should see <literal>Error 1 (ignored)</literal> in the output. Apart
119    from this, the Glibc test suite is always expected to pass. However, in certain
120    circumstances, some failures are unavoidable. If a test fails because of a missing
121    program (or missing symbolic link), or a segfault, you will see an error code
122    greater than 127 and the details will be in the log. More commonly, tests will
123    fail with <literal>Error 2</literal> - for these, the contents of the corresponding
124    <filename>.out</filename> file, e.g. <filename>posix/annexc.out</filename> may be
125    informative. Here is a list of the most common issues:</para>
126
127    <itemizedlist os="p">
128      <listitem>
129        <para>The <emphasis>nptl/tst-clock2</emphasis>,
130        <emphasis>nptl/tst-attr3</emphasis>,
131        <emphasis>tst/tst-cputimer1</emphasis>, and
132        <emphasis>rt/tst-cpuclock2</emphasis>
133        tests have been known to fail.  The
134        reason is not completely understood, but indications are that minor
135        timing issues can trigger these failures.</para>
136      </listitem>
137      <listitem>
138        <para>The <emphasis>math</emphasis> tests sometimes fail.
139        Certain optimization settings are known to be a
140        factor here.</para>
141      </listitem>
142      <listitem>
143        <para>If you have mounted the CLFS partition with the
144        <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
145        will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
146        do not use the <parameter>noatime</parameter> option while building
147        CLFS.</para>
148      </listitem>
149      <listitem>
150        <para>When running on older and slower hardware, some tests
151        can fail because of test timeouts being exceeded.
152        Modifying the make check command to set a TIMEOUTFACTOR is reported to
153        help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
154        make -k check</command>).</para>
155      </listitem>
156      <listitem>
157        <para>posix/tst-getaddrinfo4 will always fail due to not having a network
158        connection when the test is run.</para>
159      </listitem>
160    </itemizedlist>
161
162    <para os="q">Though it is a harmless message, the install stage of Glibc will
163    complain about the absence of <filename>/etc/ld.so.conf</filename>.
164    Prevent this warning with:</para>
165
166<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
167
168    <para os="s">Install the package, and remove unneeded files from
169    <filename class="directory">/usr/include/rpcsvc</filename>:</para>
170
171<screen os="t"><userinput>make install &amp;&amp;
172rm -v /usr/include/rpcsvc/*.x</userinput></screen>
173
174    <para os="u">Install the configuration file and runtime directory for
175    <command>nscd</command>:</para>
176
177<screen os="v"><userinput>cp -v ../glibc-2.19/nscd/nscd.conf /etc/nscd.conf
178mkdir -pv /var/cache/nscd</userinput></screen>
179
180  </sect2>
181
182  <sect2 id="i18n-glibc" role="configuration">
183    <title>Internationalization</title>
184
185    <para>The locales that can make the system respond in a different
186    language were not installed by the above command. Install them
187    with:</para>
188
189<screen><userinput>make localedata/install-locales</userinput></screen>
190
191    <para>To save time, an alternative to running the previous command (which
192    generates and installs every locale listed in the
193    <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file) is
194    to install only those locales that are wanted and needed. This can be
195    achieved by using the <command>localedef</command> command. Information on
196    this command is located in the <filename>INSTALL</filename> file in the
197    Glibc source. However, there are a number of locales that are essential in
198    order for the tests of future packages to pass, in particular, the
199    <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
200    instead of the <parameter>install-locales</parameter> target used above,
201    will install the minimum set of locales necessary for the tests to run
202    successfully:</para>
203
204<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
205localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
206localedef -i de_DE -f ISO-8859-1 de_DE
207localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
208localedef -i en_HK -f ISO-8859-1 en_HK
209localedef -i en_PH -f ISO-8859-1 en_PH
210localedef -i en_US -f ISO-8859-1 en_US
211localedef -i es_MX -f ISO-8859-1 es_MX
212localedef -i fa_IR -f UTF-8 fa_IR
213localedef -i fr_FR -f ISO-8859-1 fr_FR
214localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
215localedef -i it_IT -f ISO-8859-1 it_IT
216localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
217
218    <para>Some locales installed by the <command>make
219    localedata/install-locales</command> command above are not properly
220    supported by some applications that are in CLFS and CBLFS. Because
221    of the various problems that arise due to application programmers making
222    assumptions that break in such locales, CLFS should not be used in locales
223    that utilize multibyte character sets (including UTF-8) or right-to-left
224    writing order.  Numerous unofficial and unstable patches are required to
225    fix these problems, and it has been decided by the CLFS developers not to
226    support such complex locales at this time. This applies to the ja_JP and
227    fa_IR locales as well&mdash;they have been installed only for GCC and
228    Gettext tests to pass, and the <command>watch</command> program (part of
229    the Procps-ng package) does not work properly in them. Various attempts to
230    circumvent these restrictions are documented in internationalization-related
231    hints.</para>
232
233  </sect2>
234
235  <sect2 id="conf-glibc" role="configuration">
236    <title>Configuring Glibc</title>
237
238    <indexterm zone="conf-glibc">
239      <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
240    </indexterm>
241
242    <indexterm zone="conf-glibc">
243      <primary sortas="e-/etc/localtime">/etc/localtime</primary>
244    </indexterm>
245
246    <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
247    because, although Glibc provides defaults when this file is missing or
248    corrupt, the Glibc defaults do not work well in a networked environment.
249    The time zone also needs to be configured.</para>
250
251    <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
252    the following:</para>
253
254<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
255<literal># Begin /etc/nsswitch.conf
256
257passwd: files
258group: files
259shadow: files
260
261hosts: files dns
262networks: files
263
264protocols: files
265services: files
266ethers: files
267rpc: files
268
269# End /etc/nsswitch.conf</literal>
270EOF</userinput></screen>
271
272    <para>Install timezone data:</para>
273<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
274
275ZONEINFO=/usr/share/zoneinfo
276mkdir -pv $ZONEINFO/{posix,right}
277
278for tz in etcetera southamerica northamerica europe africa antarctica  \
279          asia australasia backward pacificnew \
280          systemv; do
281    zic -L /dev/null   -d $ZONEINFO       -y "sh yearistype.sh" ${tz}
282    zic -L /dev/null   -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
283    zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
284done
285
286cp -v zone.tab iso3166.tab $ZONEINFO
287zic -d $ZONEINFO -p America/New_York
288unset ZONEINFO</userinput></screen>
289
290    <variablelist>
291      <title>The meaning of the zic commands:</title>
292
293      <varlistentry>
294        <term><parameter>zic -L /dev/null ...</parameter></term>
295        <listitem>
296          <para>This creates posix timezones, without any leap seconds.  It is
297          conventional to put these in both
298          <filename class="directory">zoneinfo</filename> and
299          <filename class="directory">zoneinfo/posix</filename>. It is
300          necessary to put the POSIX timezones in
301          <filename class="directory">zoneinfo</filename>, otherwise various
302          test-suites will report errors. On an embedded system, where space is
303          tight and you do not intend to ever update the timezones, you could save
304          1.9MB by not using the <filename class="directory">posix</filename>
305          directory, but some applications or test-suites might give less good
306          results</para>
307        </listitem>
308      </varlistentry>
309      <varlistentry>
310        <term><parameter>zic -L leapseconds ...</parameter></term>
311        <listitem>
312          <para>This creates right timezones, including leap seconds. On an
313          embedded system, where space is tight and you do not intend to
314          ever update the timezones, or care about the correct time, you could
315          save 1.9MB by omitting the <filename class="directory">right</filename>
316          directory.</para>
317        </listitem>
318      </varlistentry>
319      <varlistentry>
320        <term><parameter>zic ... -p ...</parameter></term>
321        <listitem>
322          <para>This creates the <filename>posixrules</filename> file. We use
323          New York because POSIX requires the daylight savings time rules
324          to be in accordance with US rules.</para>
325        </listitem>
326      </varlistentry>
327    </variablelist>
328
329    <para>To determine the local time zone, run the following script:</para>
330
331<screen role="nodump"><userinput>tzselect</userinput></screen>
332
333    <para>After answering a few questions about the location, the script will
334    output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
335    <emphasis>Canada/Eastern</emphasis>). Then create the
336    <filename>/etc/localtime</filename> file by running:</para>
337
338<screen><userinput>cp -v /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
339    /etc/localtime</userinput></screen>
340
341    <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
342    that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
343
344  </sect2>
345
346  <sect2 id="conf-ld" role="configuration">
347    <title>Configuring The Dynamic Loader</title>
348
349    <indexterm zone="conf-ld">
350      <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
351    </indexterm>
352
353    <para os="ld-a">By default, the dynamic loader (<filename
354    class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
355    <filename class="directory">/lib</filename> and <filename
356    class="directory">/usr/lib</filename> for dynamic libraries that are
357    needed by programs as they are run. However, if there are libraries in
358    directories other than <filename class="directory">/lib</filename> and
359    <filename class="directory">/usr/lib</filename>, these need to be
360    added to the <filename>/etc/ld.so.conf</filename> file in order
361    for the dynamic loader to find them. Two directories that are commonly
362    known to contain additional libraries are <filename
363    class="directory">/usr/local/lib</filename> and <filename
364    class="directory">/opt/lib</filename>, so add those directories to the
365    dynamic loader's search path.</para>
366
367    <para os="ld-b">Create a new file <filename>/etc/ld.so.conf</filename> by running the
368    following:</para>
369
370<screen os="ld-c"><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
371<literal># Begin /etc/ld.so.conf
372
373/usr/local/lib
374/opt/lib
375
376# End /etc/ld.so.conf</literal>
377EOF</userinput></screen>
378
379  </sect2>
380
381  <sect2 id="contents-glibc" role="content">
382    <title>Contents of Glibc</title>
383
384    <segmentedlist>
385      <segtitle>Installed programs</segtitle>
386      <segtitle>Installed libraries</segtitle>
387      <segtitle>Installed directories</segtitle>
388
389      <seglistitem>
390        <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
391        ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd,
392        pcprofiledump, pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
393        zdump, zic</seg>
394        <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
395        libc.[a,so], libc_nonshared.a, libcidn.[a,so], libcrypt.[a,so],
396        libdl.[a,so], libg.a, libieee.a, libm.[a,so], libmcheck.a,
397        libmemusage.so, libnsl.a, libnss_compat.so, libnss_dns.so,
398        libnss_files.so, libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so,
399        libpcprofile.so, libpthread.[a,so], libpthread_nonshared.a,
400        libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so,
401        libutil.[a,so]</seg>
402        <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
403        /usr/include/net, /usr/include/netash, /usr/include/netatalk,
404        /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
405        /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
406        /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
407        /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
408        /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/glibc, /usr/lib/locale,
409        /usr/share/i18n, /usr/share/zoneinfo, /var/cache/ldconfig,
410        /var/cache/nscd</seg>
411      </seglistitem>
412    </segmentedlist>
413
414    <variablelist>
415      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
416      <?dbfo list-presentation="list"?>
417      <?dbhtml list-presentation="table"?>
418
419      <varlistentry id="catchsegv">
420        <term><command>catchsegv</command></term>
421        <listitem>
422          <para>Can be used to create a stack trace when a program
423          terminates with a segmentation fault</para>
424          <indexterm zone="ch-system-glibc catchsegv">
425            <primary sortas="b-catchsegv">catchsegv</primary>
426          </indexterm>
427        </listitem>
428      </varlistentry>
429
430      <varlistentry id="gencat">
431        <term><command>gencat</command></term>
432        <listitem>
433          <para>Generates message catalogues</para>
434          <indexterm zone="ch-system-glibc gencat">
435            <primary sortas="b-gencat">gencat</primary>
436          </indexterm>
437        </listitem>
438      </varlistentry>
439
440      <varlistentry id="getconf">
441        <term><command>getconf</command></term>
442        <listitem>
443          <para>Displays the system configuration values for file system specific
444          variables</para>
445          <indexterm zone="ch-system-glibc getconf">
446            <primary sortas="b-getconf">getconf</primary>
447          </indexterm>
448        </listitem>
449      </varlistentry>
450
451      <varlistentry id="getent">
452        <term><command>getent</command></term>
453        <listitem>
454          <para>Gets entries from an administrative database</para>
455          <indexterm zone="ch-system-glibc getent">
456            <primary sortas="b-getent">getent</primary>
457          </indexterm>
458        </listitem>
459      </varlistentry>
460
461      <varlistentry id="iconv">
462        <term><command>iconv</command></term>
463        <listitem>
464          <para>Performs character set conversion</para>
465          <indexterm zone="ch-system-glibc iconv">
466            <primary sortas="b-iconv">iconv</primary>
467          </indexterm>
468        </listitem>
469      </varlistentry>
470
471      <varlistentry id="iconvconfig">
472        <term><command>iconvconfig</command></term>
473        <listitem>
474          <para>Creates fastloading <command>iconv</command> module configuration
475          files</para>
476          <indexterm zone="ch-system-glibc iconvconfig">
477            <primary sortas="b-iconvconfig">iconvconfig</primary>
478          </indexterm>
479        </listitem>
480      </varlistentry>
481
482      <varlistentry id="ldconfig">
483        <term><command>ldconfig</command></term>
484        <listitem>
485          <para>Configures the dynamic linker runtime bindings</para>
486          <indexterm zone="ch-system-glibc ldconfig">
487            <primary sortas="b-ldconfig">ldconfig</primary>
488          </indexterm>
489        </listitem>
490      </varlistentry>
491
492      <varlistentry id="ldd">
493        <term><command>ldd</command></term>
494        <listitem>
495          <para>Reports which shared libraries are required
496          by each given program or shared library</para>
497          <indexterm zone="ch-system-glibc ldd">
498            <primary sortas="b-ldd">ldd</primary>
499          </indexterm>
500        </listitem>
501      </varlistentry>
502
503      <varlistentry id="lddlibc4">
504        <term><command>lddlibc4</command></term>
505        <listitem>
506          <para>Assists <command>ldd</command> with object files</para>
507          <indexterm zone="ch-system-glibc lddlibc4">
508            <primary sortas="b-lddlibc4">lddlibc4</primary>
509          </indexterm>
510        </listitem>
511      </varlistentry>
512
513      <varlistentry id="locale">
514        <term><command>locale</command></term>
515        <listitem>
516          <para>Tells the compiler to enable or disable the use of POSIX locales
517          for built-in operations</para>
518          <indexterm zone="ch-system-glibc locale">
519            <primary sortas="b-locale">locale</primary>
520          </indexterm>
521        </listitem>
522      </varlistentry>
523
524      <varlistentry id="localedef">
525        <term><command>localedef</command></term>
526        <listitem>
527          <para>Compiles locale specifications</para>
528          <indexterm zone="ch-system-glibc localedef">
529            <primary sortas="b-localedef">localedef</primary>
530          </indexterm>
531        </listitem>
532      </varlistentry>
533
534      <varlistentry id="makedb">
535        <term><command>makedb</command></term>
536        <listitem>
537          <para>Creates a simple database from textual input</para>
538          <indexterm zone="ch-system-glibc makedb">
539            <primary sortas="b-makedb">makedb</primary>
540          </indexterm>
541        </listitem>
542      </varlistentry>
543
544      <varlistentry id="mtrace">
545        <term><command>mtrace</command></term>
546        <listitem>
547          <para>Reads and interprets a memory trace file and
548          displays a summary in human-readable format</para>
549          <indexterm zone="ch-system-glibc mtrace">
550            <primary sortas="b-mtrace">mtrace</primary>
551          </indexterm>
552        </listitem>
553      </varlistentry>
554
555      <varlistentry id="nscd">
556        <term><command>nscd</command></term>
557        <listitem>
558          <para>A daemon that provides a cache for the most common name
559          service requests</para>
560          <indexterm zone="ch-system-glibc nscd">
561            <primary sortas="b-nscd">nscd</primary>
562          </indexterm>
563        </listitem>
564      </varlistentry>
565
566      <varlistentry id="pcprofiledump">
567        <term><command>pcprofiledump</command></term>
568        <listitem>
569          <para>Dumps information generated by PC profiling</para>
570          <indexterm zone="ch-system-glibc pcprofiledump">
571            <primary sortas="b-pcprofiledump">pcprofiledump</primary>
572          </indexterm>
573        </listitem>
574      </varlistentry>
575
576      <varlistentry id="pldd">
577        <term><command>pldd</command></term>
578        <listitem>
579          <para>Lists dynamic shared objects used by running processes</para>
580          <indexterm zone="ch-system-glibc pldd">
581            <primary sortas="b-pldd">pldd</primary>
582          </indexterm>
583        </listitem>
584      </varlistentry>
585
586      <varlistentry id="rpcgen">
587        <term><command>rpcgen</command></term>
588        <listitem>
589          <para>Generates C code to implement the Remote Procecure Call (RPC)
590          protocol</para>
591          <indexterm zone="ch-system-glibc rpcgen">
592            <primary sortas="b-rpcgen">rpcgen</primary>
593          </indexterm>
594        </listitem>
595      </varlistentry>
596
597      <varlistentry id="sln">
598        <term><command>sln</command></term>
599        <listitem>
600          <para>A statically linked program that creates symbolic links</para>
601          <indexterm zone="ch-system-glibc sln">
602            <primary sortas="b-sln">sln</primary>
603          </indexterm>
604        </listitem>
605      </varlistentry>
606
607      <varlistentry id="sotruss">
608        <term><command>sotruss</command></term>
609        <listitem>
610          <para>Traces shared library procedure calls of a specified command</para>
611          <indexterm zone="ch-system-glibc sotruss">
612            <primary sortas="b-sotruss">sotruss</primary>
613          </indexterm>
614        </listitem>
615      </varlistentry>
616
617      <varlistentry id="sprof">
618        <term><command>sprof</command></term>
619        <listitem>
620          <para>Reads and displays shared object profiling data</para>
621          <indexterm zone="ch-system-glibc sprof">
622            <primary sortas="b-sprof">sprof</primary>
623          </indexterm>
624        </listitem>
625      </varlistentry>
626
627      <varlistentry id="tzselect">
628        <term><command>tzselect</command></term>
629        <listitem>
630          <para>Asks the user about the location of the
631          system and reports the corresponding time zone description</para>
632          <indexterm zone="ch-system-glibc tzselect">
633            <primary sortas="b-tzselect">tzselect</primary>
634          </indexterm>
635        </listitem>
636      </varlistentry>
637
638      <varlistentry id="xtrace">
639        <term><command>xtrace</command></term>
640        <listitem>
641          <para>Traces the execution of a program by
642          printing the currently executed function</para>
643          <indexterm zone="ch-system-glibc xtrace">
644            <primary sortas="b-xtrace">xtrace</primary>
645          </indexterm>
646        </listitem>
647      </varlistentry>
648
649      <varlistentry id="zdump">
650        <term><command>zdump</command></term>
651        <listitem>
652          <para>The time zone dumper</para>
653          <indexterm zone="ch-system-glibc zdump">
654            <primary sortas="b-zdump">zdump</primary>
655          </indexterm>
656        </listitem>
657      </varlistentry>
658
659      <varlistentry id="zic">
660        <term><command>zic</command></term>
661        <listitem>
662          <para>The time zone compiler</para>
663          <indexterm zone="ch-system-glibc zic">
664            <primary sortas="b-zic">zic</primary>
665          </indexterm>
666        </listitem>
667      </varlistentry>
668
669      <varlistentry id="ld.so">
670        <term><filename class="libraryfile">ld.so</filename></term>
671        <listitem>
672          <para>The helper program for shared library executables</para>
673          <indexterm zone="ch-system-glibc ld.so">
674            <primary sortas="c-ld.so">ld.so</primary>
675          </indexterm>
676        </listitem>
677      </varlistentry>
678
679      <varlistentry id="libBrokenLocale">
680        <term><filename class="libraryfile">libBrokenLocale</filename></term>
681        <listitem>
682          <para>Used by programs, such as Mozilla, to solve broken locales</para>
683          <indexterm zone="ch-system-glibc libBrokenLocale">
684            <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
685          </indexterm>
686        </listitem>
687      </varlistentry>
688
689      <varlistentry id="libSegFault">
690        <term><filename class="libraryfile">libSegFault</filename></term>
691        <listitem>
692          <para>The segmentation fault signal handler</para>
693          <indexterm zone="ch-system-glibc libSegFault">
694            <primary sortas="c-libSegFault">libSegFault</primary>
695          </indexterm>
696        </listitem>
697      </varlistentry>
698
699      <varlistentry id="libanl">
700        <term><filename class="libraryfile">libanl</filename></term>
701        <listitem>
702          <para>An asynchronous name lookup library</para>
703          <indexterm zone="ch-system-glibc libanl">
704            <primary sortas="c-libanl">libanl</primary>
705          </indexterm>
706        </listitem>
707      </varlistentry>
708
709      <varlistentry id="libc">
710        <term><filename class="libraryfile">libc</filename></term>
711        <listitem>
712          <para>The main C library</para>
713          <indexterm zone="ch-system-glibc libc">
714            <primary sortas="c-libc">libc</primary>
715          </indexterm>
716        </listitem>
717      </varlistentry>
718
719      <varlistentry id="libcidn">
720        <term><filename class="libraryfile">libcidn</filename></term>
721        <listitem>
722          <para>Used internally by Glibc for handling internationalized domain
723          names in the <function>getaddrinfo()</function> function</para>
724          <indexterm zone="ch-system-glibc libcidn">
725            <primary sortas="c-libcidn">libcidn</primary>
726          </indexterm>
727        </listitem>
728      </varlistentry>
729
730      <varlistentry id="libcrypt">
731        <term><filename class="libraryfile">libcrypt</filename></term>
732        <listitem>
733          <para>The cryptography library</para>
734          <indexterm zone="ch-system-glibc libcrypt">
735            <primary sortas="c-libcrypt">libcrypt</primary>
736          </indexterm>
737        </listitem>
738      </varlistentry>
739
740      <varlistentry id="libdl">
741        <term><filename class="libraryfile">libdl</filename></term>
742        <listitem>
743          <para>The dynamic linking interface library</para>
744          <indexterm zone="ch-system-glibc libdl">
745            <primary sortas="c-libdl">libdl</primary>
746          </indexterm>
747        </listitem>
748      </varlistentry>
749
750      <varlistentry id="libg">
751        <term><filename class="libraryfile">libg</filename></term>
752        <listitem>
753          <para>A runtime library for <command>g++</command></para>
754          <indexterm zone="ch-system-glibc libg">
755            <primary sortas="c-libg">libg</primary>
756          </indexterm>
757        </listitem>
758      </varlistentry>
759
760      <varlistentry id="libieee">
761        <term><filename class="libraryfile">libieee</filename></term>
762        <listitem>
763          <para>The Institute of Electrical and Electronic Engineers (IEEE)
764          floating point library</para>
765          <indexterm zone="ch-system-glibc libieee">
766            <primary sortas="c-libieee">libieee</primary>
767          </indexterm>
768        </listitem>
769      </varlistentry>
770
771      <varlistentry id="libm">
772        <term><filename class="libraryfile">libm</filename></term>
773        <listitem>
774          <para>The mathematical library</para>
775          <indexterm zone="ch-system-glibc libm">
776            <primary sortas="c-libm">libm</primary>
777          </indexterm>
778        </listitem>
779      </varlistentry>
780
781      <varlistentry id="libmcheck">
782        <term><filename class="libraryfile">libmcheck</filename></term>
783        <listitem>
784          <para>Contains code run at boot</para>
785          <indexterm zone="ch-system-glibc libmcheck">
786            <primary sortas="c-libmcheck">libmcheck</primary>
787          </indexterm>
788        </listitem>
789      </varlistentry>
790
791      <varlistentry id="libmemusage">
792        <term><filename class="libraryfile">libmemusage</filename></term>
793        <listitem>
794          <para>Used by <command>memusage</command> (included in Glibc, but
795          not built in a base CLFS system as it has additional dependencies)
796          to help collect information about the memory usage of a program</para>
797          <indexterm zone="ch-system-glibc libmemusage">
798            <primary sortas="c-libmemusage">libmemusage</primary>
799          </indexterm>
800        </listitem>
801      </varlistentry>
802
803      <varlistentry id="libnsl">
804        <term><filename class="libraryfile">libnsl</filename></term>
805        <listitem>
806          <para>The network services library</para>
807          <indexterm zone="ch-system-glibc libnsl">
808            <primary sortas="c-libnsl">libnsl</primary>
809          </indexterm>
810        </listitem>
811      </varlistentry>
812
813      <varlistentry id="libnss">
814        <term><filename class="libraryfile">libnss</filename></term>
815        <listitem>
816          <para>The Name Service Switch libraries, containing functions for
817          resolving host names, user names, group names, aliases, services,
818          protocols, etc.</para>
819          <indexterm zone="ch-system-glibc libnss">
820            <primary sortas="c-libnss">libnss</primary>
821          </indexterm>
822        </listitem>
823      </varlistentry>
824
825      <varlistentry id="libpcprofile">
826        <term><filename class="libraryfile">libpcprofile</filename></term>
827        <listitem>
828          <para>Contains profiling functions used to track the amount of CPU
829          time spent in specific source code lines</para>
830          <indexterm zone="ch-system-glibc libpcprofile">
831            <primary sortas="c-libpcprofile">libpcprofile</primary>
832          </indexterm>
833        </listitem>
834      </varlistentry>
835
836      <varlistentry id="libpthread">
837        <term><filename class="libraryfile">libpthread</filename></term>
838        <listitem>
839          <para>The POSIX threads library</para>
840          <indexterm zone="ch-system-glibc libpthread">
841            <primary sortas="c-libpthread">libpthread</primary>
842          </indexterm>
843        </listitem>
844      </varlistentry>
845
846      <varlistentry id="libresolv">
847        <term><filename class="libraryfile">libresolv</filename></term>
848        <listitem>
849          <para>Contains functions for creating, sending, and interpreting
850          packets to the Internet domain name servers</para>
851          <indexterm zone="ch-system-glibc libresolv">
852            <primary sortas="c-libresolv">libresolv</primary>
853          </indexterm>
854        </listitem>
855      </varlistentry>
856
857      <varlistentry id="librpcsvc">
858        <term><filename class="libraryfile">librpcsvc</filename></term>
859        <listitem>
860          <para>Contains functions providing miscellaneous RPC services</para>
861          <indexterm zone="ch-system-glibc librpcsvc">
862            <primary sortas="c-librpcsvc">librpcsvc</primary>
863          </indexterm>
864        </listitem>
865      </varlistentry>
866
867      <varlistentry id="librt">
868        <term><filename class="libraryfile">librt</filename></term>
869        <listitem>
870          <para>Contains functions providing most of the interfaces specified by
871          the POSIX.1b Realtime Extension</para>
872          <indexterm zone="ch-system-glibc librt">
873            <primary sortas="c-librt">librt</primary>
874          </indexterm>
875        </listitem>
876      </varlistentry>
877
878      <varlistentry id="libthread_db">
879        <term><filename class="libraryfile">libthread_db</filename></term>
880        <listitem>
881          <para>Contains functions useful for
882          building debuggers for multi-threaded programs</para>
883          <indexterm zone="ch-system-glibc libthread_db">
884            <primary sortas="c-libthread_db">libthread_db</primary>
885          </indexterm>
886        </listitem>
887      </varlistentry>
888
889      <varlistentry id="libutil">
890        <term><filename class="libraryfile">libutil</filename></term>
891        <listitem>
892          <para>Contains code for <quote>standard</quote> functions used in
893          many different Unix utilities</para>
894          <indexterm zone="ch-system-glibc libutil">
895            <primary sortas="c-libutil">libutil</primary>
896          </indexterm>
897        </listitem>
898      </varlistentry>
899
900    </variablelist>
901
902  </sect2>
903
904</sect1>
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