source: BOOK/final-system/common/glibc.xml @ f698055a

clfs-3.0.0-systemdsystemd
Last change on this file since f698055a was f698055a, checked in by Chris Staub <chris@…>, 8 years ago

Improve consistency in package installation lists, mainly removing 'and'

  • Property mode set to 100644
File size: 35.0 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4  <!ENTITY % general-entities SYSTEM "../../general.ent">
5  %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9  <?dbhtml filename="glibc.html"?>
10
11  <title>Glibc-&glibc-version;</title>
12
13  <indexterm zone="ch-system-glibc">
14    <primary sortas="a-Glibc">Glibc</primary>
15  </indexterm>
16
17  <sect2 role="package">
18    <title/>
19
20    <para>The Glibc package contains the main C library. This library provides
21    the basic routines for allocating memory, searching directories, opening and
22    closing files, reading and writing files, string handling, pattern matching,
23    arithmetic, and so on.</para>
24
25  </sect2>
26
27  <sect2 role="installation">
28    <title>Installation of Glibc</title>
29
30    <note os="z">
31      <para>Some packages outside of CLFS suggest installing GNU libiconv in
32      order to translate data from one encoding to another. The project's
33      home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
34      <quote>This library provides an <function>iconv()</function>
35      implementation, for use on systems which don't have one, or whose
36      implementation cannot convert from/to Unicode.</quote> Glibc provides
37      an <function>iconv()</function> implementation and can convert from/to
38      Unicode, therefore libiconv is not required on a CLFS system.</para>
39    </note>
40
41    <para os="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    ld.so, and our toolchain is still configured to use the one in /tools. The
52    following set of commands will force the script to use the complete path
53    of the new ld.so that was just installed:</para>
54
55<screen os="l4"><userinput>LINKER=$(readelf -l /tools/bin/bash | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
56sed -i "s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=${LINKER} -o|" \
57  scripts/test-installation.pl
58unset LINKER</userinput></screen>
59
60    <para os="b">The Glibc build system is self-contained and will install
61    perfectly, even though the compiler specs file and linker are still
62    pointing at <filename class="directory">/tools</filename>. The specs
63    and linker cannot be adjusted before the Glibc install because the
64    Glibc Autoconf tests would give false results and defeat the goal
65    of achieving a clean build.</para>
66
67    <para os="s1">Apply the following sed so the <command>tzselect</command> script works properly:</para>
68
69<screen os="s2"><userinput>sed -i 's/\\$$(pwd)/`pwd`/' timezone/Makefile</userinput></screen>
70
71    <para os="e">The Glibc documentation recommends building Glibc outside of     the source directory in a dedicated build directory:</para>
72
73<screen os="f"><userinput>mkdir -v ../glibc-build
74cd ../glibc-build</userinput></screen>
75
76    <para os="g">Prepare Glibc for compilation:</para>
77
78<screen os="h"><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
79    --disable-profile --enable-kernel=&glibc-kernel-version; --libexecdir=/usr/lib/glibc \
80    --enable-obsolete-rpc</userinput></screen>
81
82    <variablelist os="i">
83      <title>The meaning of the new configure option:</title>
84
85      <varlistentry>
86        <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
87        <listitem>
88          <para>This changes the location of the <command>getconf</command>
89          utility from its default of <filename
90          class="directory">/usr/libexec</filename> to <filename
91          class="directory">/usr/lib/glibc</filename>.</para>
92        </listitem>
93      </varlistentry>
94    </variablelist>
95
96    <para os="j">Compile the package:</para>
97
98<screen os="k"><userinput>make</userinput></screen>
99
100    <important os="l">
101      <para>The test suite for Glibc is considered critical.
102      Do not skip it under any circumstance.</para>
103    </important>
104
105    <para os="m">Use the following commands to run the test suite and output
106    any test failures:</para>
107
108<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
109
110<screen os="n"><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log; grep Error glibc-check-log</userinput></screen>
111
112    <para os="o">The Glibc test suite is highly dependent on certain functions of
113    the host system, in particular the kernel. The <emphasis>posix/annexc</emphasis> and
114    <emphasis>conform/run-conformtest</emphasis> tests normally fail
115    and you should see <literal>Error 1 (ignored)</literal> in the output. Apart
116    from this, the Glibc test suite is always expected to pass. However, in certain
117    circumstances, some failures are unavoidable. If a test fails because of a missing
118    program (or missing symbolic link), or a segfault, you will see an error code
119    greater than 127 and the details will be in the log. More commonly, tests will
120    fail with <literal>Error 2</literal> - for these, the contents of the corresponding
121    <filename>.out</filename> file, e.g. <filename>posix/annexc.out</filename> may be
122    informative. Here is a list of the most common issues:</para>
123
124    <itemizedlist os="p">
125      <listitem>
126        <para>The <emphasis>nptl/tst-clock2</emphasis>,
127        <emphasis>nptl/tst-attr3</emphasis>,
128        <emphasis>tst/tst-cputimer1</emphasis>, and
129        <emphasis>rt/tst-cpuclock2</emphasis>
130        tests have been known to fail.  The
131        reason is not completely understood, but indications are that minor
132        timing issues can trigger these failures.</para>
133      </listitem>
134      <listitem>
135        <para>The <emphasis>math</emphasis> tests sometimes fail.
136        Certain optimization settings are known to be a
137        factor here.</para>
138      </listitem>
139      <listitem>
140        <para>If you have mounted the CLFS partition with the
141        <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
142        will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
143        do not use the <parameter>noatime</parameter> option while building
144        CLFS.</para>
145      </listitem>
146      <listitem>
147        <para>When running on older and slower hardware, some tests
148        can fail because of test timeouts being exceeded.
149        Modifying the make check command to set a TIMEOUTFACTOR is reported to
150        help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
151        make -k check</command>).</para>
152      </listitem>
153      <listitem>
154        <para>posix/tst-getaddrinfo4 will always fail due to not having a network
155        connection when the test is run.</para>
156      </listitem>
157    </itemizedlist>
158
159    <para os="q">Though it is a harmless message, the install stage of Glibc will
160    complain about the absence of <filename>/etc/ld.so.conf</filename>.
161    Prevent this warning with:</para>
162
163<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
164
165    <para os="s">Install the package, and remove unneeded files from
166    <filename class="directory">/usr/include/rpcsvc</filename>:</para>
167
168<screen os="t"><userinput>make install &amp;&amp;
169rm -v /usr/include/rpcsvc/*.x</userinput></screen>
170
171    <para os="u">Install the configuration file and runtime directory for
172    <command>nscd</command>:</para>
173
174<screen os="v"><userinput>cp -v ../glibc-2.19/nscd/nscd.conf /etc/nscd.conf
175mkdir -pv /var/cache/nscd</userinput></screen>
176
177    <para os="w">Install the systemd support files for <command>nscd</command>:</para>
178
179<screen os="x"><userinput>install -v -Dm644 ../glibc-2.19/nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
180install -v -Dm644 ../glibc-2.19/nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
181
182  </sect2>
183
184  <sect2 id="i18n-glibc" role="configuration">
185    <title>Internationalization</title>
186
187    <para>The locales that can make the system respond in a different
188    language were not installed by the above command. Install them
189    with:</para>
190
191<screen><userinput>make localedata/install-locales</userinput></screen>
192
193    <para>To save time, an alternative to running the previous command (which
194    generates and installs every locale listed in the
195    <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file) is
196    to install only those locales that are wanted and needed. This can be
197    achieved by using the <command>localedef</command> command. Information on
198    this command is located in the <filename>INSTALL</filename> file in the
199    Glibc source. However, there are a number of locales that are essential in
200    order for the tests of future packages to pass, in particular, the
201    <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
202    instead of the <parameter>install-locales</parameter> target used above,
203    will install the minimum set of locales necessary for the tests to run
204    successfully:</para>
205
206<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
207localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
208localedef -i de_DE -f ISO-8859-1 de_DE
209localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
210localedef -i en_HK -f ISO-8859-1 en_HK
211localedef -i en_PH -f ISO-8859-1 en_PH
212localedef -i en_US -f ISO-8859-1 en_US
213localedef -i es_MX -f ISO-8859-1 es_MX
214localedef -i fa_IR -f UTF-8 fa_IR
215localedef -i fr_FR -f ISO-8859-1 fr_FR
216localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
217localedef -i it_IT -f ISO-8859-1 it_IT
218localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
219
220    <para>Some locales installed by the <command>make
221    localedata/install-locales</command> command above are not properly
222    supported by some applications that are in CLFS and CBLFS. Because
223    of the various problems that arise due to application programmers making
224    assumptions that break in such locales, CLFS should not be used in locales
225    that utilize multibyte character sets (including UTF-8) or right-to-left
226    writing order.  Numerous unofficial and unstable patches are required to
227    fix these problems, and it has been decided by the CLFS developers not to
228    support such complex locales at this time. This applies to the ja_JP and
229    fa_IR locales as well&mdash;they have been installed only for GCC and
230    Gettext tests to pass, and the <command>watch</command> program (part of
231    the Procps-ng package) does not work properly in them. Various attempts to
232    circumvent these restrictions are documented in internationalization-related
233    hints.</para>
234
235  </sect2>
236
237  <sect2 id="conf-glibc" role="configuration">
238    <title>Configuring Glibc</title>
239
240    <indexterm zone="conf-glibc">
241      <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
242    </indexterm>
243
244    <indexterm zone="conf-glibc">
245      <primary sortas="e-/etc/localtime">/etc/localtime</primary>
246    </indexterm>
247
248    <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
249    because, although Glibc provides defaults when this file is missing or
250    corrupt, the Glibc defaults do not work well in a networked environment.
251    The time zone also needs to be configured.</para>
252
253    <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
254    the following:</para>
255
256<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
257<literal># Begin /etc/nsswitch.conf
258
259passwd: files
260group: files
261shadow: files
262
263hosts: files dns
264networks: files
265
266protocols: files
267services: files
268ethers: files
269rpc: files
270
271# End /etc/nsswitch.conf</literal>
272EOF</userinput></screen>
273
274    <para>Install timezone data:</para>
275<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
276
277ZONEINFO=/usr/share/zoneinfo
278mkdir -pv $ZONEINFO/{posix,right}
279
280for tz in etcetera southamerica northamerica europe africa antarctica  \
281          asia australasia backward pacificnew \
282          systemv; do
283    zic -L /dev/null   -d $ZONEINFO       -y "sh yearistype.sh" ${tz}
284    zic -L /dev/null   -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
285    zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
286done
287
288cp -v zone.tab iso3166.tab $ZONEINFO
289zic -d $ZONEINFO -p America/New_York
290unset ZONEINFO</userinput></screen>
291
292    <variablelist>
293      <title>The meaning of the zic commands:</title>
294
295      <varlistentry>
296        <term><parameter>zic -L /dev/null ...</parameter></term>
297        <listitem>
298          <para>This creates posix timezones, without any leap seconds.  It is
299          conventional to put these in both
300          <filename class="directory">zoneinfo</filename> and
301          <filename class="directory">zoneinfo/posix</filename>. It is
302          necessary to put the POSIX timezones in
303          <filename class="directory">zoneinfo</filename>, otherwise various
304          test-suites will report errors. On an embedded system, where space is
305          tight and you do not intend to ever update the timezones, you could save
306          1.9MB by not using the <filename class="directory">posix</filename>
307          directory, but some applications or test-suites might give less good
308          results</para>
309        </listitem>
310      </varlistentry>
311      <varlistentry>
312        <term><parameter>zic -L leapseconds ...</parameter></term>
313        <listitem>
314          <para>This creates right timezones, including leap seconds. On an
315          embedded system, where space is tight and you do not intend to
316          ever update the timezones, or care about the correct time, you could
317          save 1.9MB by omitting the <filename class="directory">right</filename>
318          directory.</para>
319        </listitem>
320      </varlistentry>
321      <varlistentry>
322        <term><parameter>zic ... -p ...</parameter></term>
323        <listitem>
324          <para>This creates the <filename>posixrules</filename> file. We use
325          New York because POSIX requires the daylight savings time rules
326          to be in accordance with US rules.</para>
327        </listitem>
328      </varlistentry>
329    </variablelist>
330
331    <para>To determine the local time zone, run the following script:</para>
332
333<screen role="nodump"><userinput>tzselect</userinput></screen>
334
335    <para>After answering a few questions about the location, the script will
336    output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
337    <emphasis>Canada/Eastern</emphasis>). Then create the
338    <filename>/etc/localtime</filename> file by running:</para>
339
340<screen><userinput>cp -v /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
341    /etc/localtime</userinput></screen>
342
343    <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
344    that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
345
346  </sect2>
347
348  <sect2 id="conf-ld" role="configuration">
349    <title>Configuring The Dynamic Loader</title>
350
351    <indexterm zone="conf-ld">
352      <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
353    </indexterm>
354
355    <para os="ld-a">By default, the dynamic loader (<filename
356    class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
357    <filename class="directory">/lib</filename> and <filename
358    class="directory">/usr/lib</filename> for dynamic libraries that are
359    needed by programs as they are run. However, if there are libraries in
360    directories other than <filename class="directory">/lib</filename> and
361    <filename class="directory">/usr/lib</filename>, these need to be
362    added to the <filename>/etc/ld.so.conf</filename> file in order
363    for the dynamic loader to find them. Two directories that are commonly
364    known to contain additional libraries are <filename
365    class="directory">/usr/local/lib</filename> and <filename
366    class="directory">/opt/lib</filename>, so add those directories to the
367    dynamic loader's search path.</para>
368
369    <para os="ld-b">Create a new file <filename>/etc/ld.so.conf</filename> by running the
370    following:</para>
371
372<screen os="ld-c"><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
373<literal># Begin /etc/ld.so.conf
374
375/usr/local/lib
376/opt/lib
377
378# End /etc/ld.so.conf</literal>
379EOF</userinput></screen>
380
381  </sect2>
382
383  <sect2 id="contents-glibc" role="content">
384    <title>Contents of Glibc</title>
385
386    <segmentedlist>
387      <segtitle>Installed programs</segtitle>
388      <segtitle>Installed libraries</segtitle>
389      <segtitle>Installed directories</segtitle>
390
391      <seglistitem>
392        <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
393        ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd,
394        pcprofiledump, pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
395        zdump, zic</seg>
396        <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
397        libc.[a,so], libc_nonshared.a, libcidn.[a,so], libcrypt.[a,so],
398        libdl.[a,so], libg.a, libieee.a, libm.[a,so], libmcheck.a,
399        libmemusage.so, libnsl.a, libnss_compat.so, libnss_dns.so,
400        libnss_files.so, libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so,
401        libpcprofile.so, libpthread.[a,so], libpthread_nonshared.a,
402        libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so,
403        libutil.[a,so]</seg>
404        <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
405        /usr/include/net, /usr/include/netash, /usr/include/netatalk,
406        /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
407        /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
408        /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
409        /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
410        /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/glibc, /usr/lib/locale,
411        /usr/share/i18n, /usr/share/zoneinfo, /var/cache/ldconfig,
412        /var/cache/nscd</seg>
413      </seglistitem>
414    </segmentedlist>
415
416    <variablelist>
417      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
418      <?dbfo list-presentation="list"?>
419      <?dbhtml list-presentation="table"?>
420
421      <varlistentry id="catchsegv">
422        <term><command>catchsegv</command></term>
423        <listitem>
424          <para>Can be used to create a stack trace when a program
425          terminates with a segmentation fault</para>
426          <indexterm zone="ch-system-glibc catchsegv">
427            <primary sortas="b-catchsegv">catchsegv</primary>
428          </indexterm>
429        </listitem>
430      </varlistentry>
431
432      <varlistentry id="gencat">
433        <term><command>gencat</command></term>
434        <listitem>
435          <para>Generates message catalogues</para>
436          <indexterm zone="ch-system-glibc gencat">
437            <primary sortas="b-gencat">gencat</primary>
438          </indexterm>
439        </listitem>
440      </varlistentry>
441
442      <varlistentry id="getconf">
443        <term><command>getconf</command></term>
444        <listitem>
445          <para>Displays the system configuration values for file system specific
446          variables</para>
447          <indexterm zone="ch-system-glibc getconf">
448            <primary sortas="b-getconf">getconf</primary>
449          </indexterm>
450        </listitem>
451      </varlistentry>
452
453      <varlistentry id="getent">
454        <term><command>getent</command></term>
455        <listitem>
456          <para>Gets entries from an administrative database</para>
457          <indexterm zone="ch-system-glibc getent">
458            <primary sortas="b-getent">getent</primary>
459          </indexterm>
460        </listitem>
461      </varlistentry>
462
463      <varlistentry id="iconv">
464        <term><command>iconv</command></term>
465        <listitem>
466          <para>Performs character set conversion</para>
467          <indexterm zone="ch-system-glibc iconv">
468            <primary sortas="b-iconv">iconv</primary>
469          </indexterm>
470        </listitem>
471      </varlistentry>
472
473      <varlistentry id="iconvconfig">
474        <term><command>iconvconfig</command></term>
475        <listitem>
476          <para>Creates fastloading <command>iconv</command> module configuration
477          files</para>
478          <indexterm zone="ch-system-glibc iconvconfig">
479            <primary sortas="b-iconvconfig">iconvconfig</primary>
480          </indexterm>
481        </listitem>
482      </varlistentry>
483
484      <varlistentry id="ldconfig">
485        <term><command>ldconfig</command></term>
486        <listitem>
487          <para>Configures the dynamic linker runtime bindings</para>
488          <indexterm zone="ch-system-glibc ldconfig">
489            <primary sortas="b-ldconfig">ldconfig</primary>
490          </indexterm>
491        </listitem>
492      </varlistentry>
493
494      <varlistentry id="ldd">
495        <term><command>ldd</command></term>
496        <listitem>
497          <para>Reports which shared libraries are required
498          by each given program or shared library</para>
499          <indexterm zone="ch-system-glibc ldd">
500            <primary sortas="b-ldd">ldd</primary>
501          </indexterm>
502        </listitem>
503      </varlistentry>
504
505      <varlistentry id="lddlibc4">
506        <term><command>lddlibc4</command></term>
507        <listitem>
508          <para>Assists <command>ldd</command> with object files</para>
509          <indexterm zone="ch-system-glibc lddlibc4">
510            <primary sortas="b-lddlibc4">lddlibc4</primary>
511          </indexterm>
512        </listitem>
513      </varlistentry>
514
515      <varlistentry id="locale">
516        <term><command>locale</command></term>
517        <listitem>
518          <para>Tells the compiler to enable or disable the use of POSIX locales
519          for built-in operations</para>
520          <indexterm zone="ch-system-glibc locale">
521            <primary sortas="b-locale">locale</primary>
522          </indexterm>
523        </listitem>
524      </varlistentry>
525
526      <varlistentry id="localedef">
527        <term><command>localedef</command></term>
528        <listitem>
529          <para>Compiles locale specifications</para>
530          <indexterm zone="ch-system-glibc localedef">
531            <primary sortas="b-localedef">localedef</primary>
532          </indexterm>
533        </listitem>
534      </varlistentry>
535
536      <varlistentry id="makedb">
537        <term><command>makedb</command></term>
538        <listitem>
539          <para>Creates a simple database from textual input</para>
540          <indexterm zone="ch-system-glibc makedb">
541            <primary sortas="b-makedb">makedb</primary>
542          </indexterm>
543        </listitem>
544      </varlistentry>
545
546      <varlistentry id="mtrace">
547        <term><command>mtrace</command></term>
548        <listitem>
549          <para>Reads and interprets a memory trace file and
550          displays a summary in human-readable format</para>
551          <indexterm zone="ch-system-glibc mtrace">
552            <primary sortas="b-mtrace">mtrace</primary>
553          </indexterm>
554        </listitem>
555      </varlistentry>
556
557      <varlistentry id="nscd">
558        <term><command>nscd</command></term>
559        <listitem>
560          <para>A daemon that provides a cache for the most common name
561          service requests</para>
562          <indexterm zone="ch-system-glibc nscd">
563            <primary sortas="b-nscd">nscd</primary>
564          </indexterm>
565        </listitem>
566      </varlistentry>
567
568      <varlistentry id="pcprofiledump">
569        <term><command>pcprofiledump</command></term>
570        <listitem>
571          <para>Dumps information generated by PC profiling</para>
572          <indexterm zone="ch-system-glibc pcprofiledump">
573            <primary sortas="b-pcprofiledump">pcprofiledump</primary>
574          </indexterm>
575        </listitem>
576      </varlistentry>
577
578      <varlistentry id="pldd">
579        <term><command>pldd</command></term>
580        <listitem>
581          <para>Lists dynamic shared objects used by running processes</para>
582          <indexterm zone="ch-system-glibc pldd">
583            <primary sortas="b-pldd">pldd</primary>
584          </indexterm>
585        </listitem>
586      </varlistentry>
587
588      <varlistentry id="rpcgen">
589        <term><command>rpcgen</command></term>
590        <listitem>
591          <para>Generates C code to implement the Remote Procecure Call (RPC)
592          protocol</para>
593          <indexterm zone="ch-system-glibc rpcgen">
594            <primary sortas="b-rpcgen">rpcgen</primary>
595          </indexterm>
596        </listitem>
597      </varlistentry>
598
599      <varlistentry id="sln">
600        <term><command>sln</command></term>
601        <listitem>
602          <para>A statically linked program that creates symbolic links</para>
603          <indexterm zone="ch-system-glibc sln">
604            <primary sortas="b-sln">sln</primary>
605          </indexterm>
606        </listitem>
607      </varlistentry>
608
609      <varlistentry id="sotruss">
610        <term><command>sotruss</command></term>
611        <listitem>
612          <para>Traces shared library procedure calls of a specified command</para>
613          <indexterm zone="ch-system-glibc sotruss">
614            <primary sortas="b-sotruss">sotruss</primary>
615          </indexterm>
616        </listitem>
617      </varlistentry>
618
619      <varlistentry id="sprof">
620        <term><command>sprof</command></term>
621        <listitem>
622          <para>Reads and displays shared object profiling data</para>
623          <indexterm zone="ch-system-glibc sprof">
624            <primary sortas="b-sprof">sprof</primary>
625          </indexterm>
626        </listitem>
627      </varlistentry>
628
629      <varlistentry id="tzselect">
630        <term><command>tzselect</command></term>
631        <listitem>
632          <para>Asks the user about the location of the
633          system and reports the corresponding time zone description</para>
634          <indexterm zone="ch-system-glibc tzselect">
635            <primary sortas="b-tzselect">tzselect</primary>
636          </indexterm>
637        </listitem>
638      </varlistentry>
639
640      <varlistentry id="xtrace">
641        <term><command>xtrace</command></term>
642        <listitem>
643          <para>Traces the execution of a program by
644          printing the currently executed function</para>
645          <indexterm zone="ch-system-glibc xtrace">
646            <primary sortas="b-xtrace">xtrace</primary>
647          </indexterm>
648        </listitem>
649      </varlistentry>
650
651      <varlistentry id="zdump">
652        <term><command>zdump</command></term>
653        <listitem>
654          <para>The time zone dumper</para>
655          <indexterm zone="ch-system-glibc zdump">
656            <primary sortas="b-zdump">zdump</primary>
657          </indexterm>
658        </listitem>
659      </varlistentry>
660
661      <varlistentry id="zic">
662        <term><command>zic</command></term>
663        <listitem>
664          <para>The time zone compiler</para>
665          <indexterm zone="ch-system-glibc zic">
666            <primary sortas="b-zic">zic</primary>
667          </indexterm>
668        </listitem>
669      </varlistentry>
670
671      <varlistentry id="ld.so">
672        <term><filename class="libraryfile">ld.so</filename></term>
673        <listitem>
674          <para>The helper program for shared library executables</para>
675          <indexterm zone="ch-system-glibc ld.so">
676            <primary sortas="c-ld.so">ld.so</primary>
677          </indexterm>
678        </listitem>
679      </varlistentry>
680
681      <varlistentry id="libBrokenLocale">
682        <term><filename class="libraryfile">libBrokenLocale</filename></term>
683        <listitem>
684          <para>Used by programs, such as Mozilla, to solve broken locales</para>
685          <indexterm zone="ch-system-glibc libBrokenLocale">
686            <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
687          </indexterm>
688        </listitem>
689      </varlistentry>
690
691      <varlistentry id="libSegFault">
692        <term><filename class="libraryfile">libSegFault</filename></term>
693        <listitem>
694          <para>The segmentation fault signal handler</para>
695          <indexterm zone="ch-system-glibc libSegFault">
696            <primary sortas="c-libSegFault">libSegFault</primary>
697          </indexterm>
698        </listitem>
699      </varlistentry>
700
701      <varlistentry id="libanl">
702        <term><filename class="libraryfile">libanl</filename></term>
703        <listitem>
704          <para>An asynchronous name lookup library</para>
705          <indexterm zone="ch-system-glibc libanl">
706            <primary sortas="c-libanl">libanl</primary>
707          </indexterm>
708        </listitem>
709      </varlistentry>
710
711      <varlistentry id="libc">
712        <term><filename class="libraryfile">libc</filename></term>
713        <listitem>
714          <para>The main C library</para>
715          <indexterm zone="ch-system-glibc libc">
716            <primary sortas="c-libc">libc</primary>
717          </indexterm>
718        </listitem>
719      </varlistentry>
720
721      <varlistentry id="libcidn">
722        <term><filename class="libraryfile">libcidn</filename></term>
723        <listitem>
724          <para>Used internally by Glibc for handling internationalized domain
725          names in the <function>getaddrinfo()</function> function</para>
726          <indexterm zone="ch-system-glibc libcidn">
727            <primary sortas="c-libcidn">libcidn</primary>
728          </indexterm>
729        </listitem>
730      </varlistentry>
731
732      <varlistentry id="libcrypt">
733        <term><filename class="libraryfile">libcrypt</filename></term>
734        <listitem>
735          <para>The cryptography library</para>
736          <indexterm zone="ch-system-glibc libcrypt">
737            <primary sortas="c-libcrypt">libcrypt</primary>
738          </indexterm>
739        </listitem>
740      </varlistentry>
741
742      <varlistentry id="libdl">
743        <term><filename class="libraryfile">libdl</filename></term>
744        <listitem>
745          <para>The dynamic linking interface library</para>
746          <indexterm zone="ch-system-glibc libdl">
747            <primary sortas="c-libdl">libdl</primary>
748          </indexterm>
749        </listitem>
750      </varlistentry>
751
752      <varlistentry id="libg">
753        <term><filename class="libraryfile">libg</filename></term>
754        <listitem>
755          <para>A runtime library for <command>g++</command></para>
756          <indexterm zone="ch-system-glibc libg">
757            <primary sortas="c-libg">libg</primary>
758          </indexterm>
759        </listitem>
760      </varlistentry>
761
762      <varlistentry id="libieee">
763        <term><filename class="libraryfile">libieee</filename></term>
764        <listitem>
765          <para>The Institute of Electrical and Electronic Engineers (IEEE)
766          floating point library</para>
767          <indexterm zone="ch-system-glibc libieee">
768            <primary sortas="c-libieee">libieee</primary>
769          </indexterm>
770        </listitem>
771      </varlistentry>
772
773      <varlistentry id="libm">
774        <term><filename class="libraryfile">libm</filename></term>
775        <listitem>
776          <para>The mathematical library</para>
777          <indexterm zone="ch-system-glibc libm">
778            <primary sortas="c-libm">libm</primary>
779          </indexterm>
780        </listitem>
781      </varlistentry>
782
783      <varlistentry id="libmcheck">
784        <term><filename class="libraryfile">libmcheck</filename></term>
785        <listitem>
786          <para>Contains code run at boot</para>
787          <indexterm zone="ch-system-glibc libmcheck">
788            <primary sortas="c-libmcheck">libmcheck</primary>
789          </indexterm>
790        </listitem>
791      </varlistentry>
792
793      <varlistentry id="libmemusage">
794        <term><filename class="libraryfile">libmemusage</filename></term>
795        <listitem>
796          <para>Used by <command>memusage</command> (included in Glibc, but
797          not built in a base CLFS system as it has additional dependencies)
798          to help collect information about the memory usage of a program</para>
799          <indexterm zone="ch-system-glibc libmemusage">
800            <primary sortas="c-libmemusage">libmemusage</primary>
801          </indexterm>
802        </listitem>
803      </varlistentry>
804
805      <varlistentry id="libnsl">
806        <term><filename class="libraryfile">libnsl</filename></term>
807        <listitem>
808          <para>The network services library</para>
809          <indexterm zone="ch-system-glibc libnsl">
810            <primary sortas="c-libnsl">libnsl</primary>
811          </indexterm>
812        </listitem>
813      </varlistentry>
814
815      <varlistentry id="libnss">
816        <term><filename class="libraryfile">libnss</filename></term>
817        <listitem>
818          <para>The Name Service Switch libraries, containing functions for
819          resolving host names, user names, group names, aliases, services,
820          protocols, etc.</para>
821          <indexterm zone="ch-system-glibc libnss">
822            <primary sortas="c-libnss">libnss</primary>
823          </indexterm>
824        </listitem>
825      </varlistentry>
826
827      <varlistentry id="libpcprofile">
828        <term><filename class="libraryfile">libpcprofile</filename></term>
829        <listitem>
830          <para>Contains profiling functions used to track the amount of CPU
831          time spent in specific source code lines</para>
832          <indexterm zone="ch-system-glibc libpcprofile">
833            <primary sortas="c-libpcprofile">libpcprofile</primary>
834          </indexterm>
835        </listitem>
836      </varlistentry>
837
838      <varlistentry id="libpthread">
839        <term><filename class="libraryfile">libpthread</filename></term>
840        <listitem>
841          <para>The POSIX threads library</para>
842          <indexterm zone="ch-system-glibc libpthread">
843            <primary sortas="c-libpthread">libpthread</primary>
844          </indexterm>
845        </listitem>
846      </varlistentry>
847
848      <varlistentry id="libresolv">
849        <term><filename class="libraryfile">libresolv</filename></term>
850        <listitem>
851          <para>Contains functions for creating, sending, and interpreting
852          packets to the Internet domain name servers</para>
853          <indexterm zone="ch-system-glibc libresolv">
854            <primary sortas="c-libresolv">libresolv</primary>
855          </indexterm>
856        </listitem>
857      </varlistentry>
858
859      <varlistentry id="librpcsvc">
860        <term><filename class="libraryfile">librpcsvc</filename></term>
861        <listitem>
862          <para>Contains functions providing miscellaneous RPC services</para>
863          <indexterm zone="ch-system-glibc librpcsvc">
864            <primary sortas="c-librpcsvc">librpcsvc</primary>
865          </indexterm>
866        </listitem>
867      </varlistentry>
868
869      <varlistentry id="librt">
870        <term><filename class="libraryfile">librt</filename></term>
871        <listitem>
872          <para>Contains functions providing most of the interfaces specified by
873          the POSIX.1b Realtime Extension</para>
874          <indexterm zone="ch-system-glibc librt">
875            <primary sortas="c-librt">librt</primary>
876          </indexterm>
877        </listitem>
878      </varlistentry>
879
880      <varlistentry id="libthread_db">
881        <term><filename class="libraryfile">libthread_db</filename></term>
882        <listitem>
883          <para>Contains functions useful for
884          building debuggers for multi-threaded programs</para>
885          <indexterm zone="ch-system-glibc libthread_db">
886            <primary sortas="c-libthread_db">libthread_db</primary>
887          </indexterm>
888        </listitem>
889      </varlistentry>
890
891      <varlistentry id="libutil">
892        <term><filename class="libraryfile">libutil</filename></term>
893        <listitem>
894          <para>Contains code for <quote>standard</quote> functions used in
895          many different Unix utilities</para>
896          <indexterm zone="ch-system-glibc libutil">
897            <primary sortas="c-libutil">libutil</primary>
898          </indexterm>
899        </listitem>
900      </varlistentry>
901
902    </variablelist>
903
904  </sect2>
905
906</sect1>
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