source: BOOK/final-system/common/glibc.xml @ 812899d5

systemd
Last change on this file since 812899d5 was 812899d5, checked in by Chris Staub <chris@…>, 6 years ago

No need to use --disable-profile on Glibc

  • Property mode set to 100644
File size: 34.7 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
43    performs its tests by attempting to compile test programs against certain
44    libraries. However it does not specify the path to
45    <filename class="libraryfile">ld.so</filename>, and our toolchain
46    is still configured to use the one in
47    <filename class="directory">/tools</filename>. The following set of
48    commands will force the script to use the complete path of the new
49    <filename class="libraryfile">ld.so</filename> that was just installed:</para>
50
51<screen os="l2"><userinput>LINKER=$(readelf -l /tools/bin/bash | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
52sed -i "s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=${LINKER} -o|" \
53  scripts/test-installation.pl
54unset LINKER</userinput></screen>
55
56    <para os="b">The Glibc build system is self-contained and will install
57    perfectly, even though the compiler specs file and linker are still
58    pointing at <filename class="directory">/tools</filename>. The specs
59    and linker cannot be adjusted before the Glibc install because the
60    Glibc Autoconf tests would give false results and defeat the goal
61    of achieving a clean build.</para>
62
63    <para os="e">The Glibc documentation recommends building Glibc outside of     the source directory in a dedicated build directory:</para>
64
65<screen os="f"><userinput>mkdir -v ../glibc-build
66cd ../glibc-build</userinput></screen>
67
68    <para os="g">Prepare Glibc for compilation:</para>
69
70<screen os="h"><userinput>../glibc-&glibc-version;/configure \
71    --prefix=/usr \
72    --enable-kernel=&glibc-kernel-version; \
73    --libexecdir=/usr/lib/glibc \
74    --enable-obsolete-rpc</userinput></screen>
75
76    <variablelist os="i">
77      <title>The meaning of the new configure option:</title>
78
79      <varlistentry>
80        <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
81        <listitem>
82          <para>This changes the location for hard links to the
83          <command>getconf</command> utility from their default of <filename
84          class="directory">/usr/libexec</filename> to <filename
85          class="directory">/usr/lib/glibc</filename>.</para>
86        </listitem>
87      </varlistentry>
88    </variablelist>
89
90    <para os="j">Compile the package:</para>
91
92<screen os="k"><userinput>make</userinput></screen>
93
94    <important os="l">
95      <para>Due to Glibc's critical role in a properly functioning system,
96      the CLFS developers strongly recommend running the testsuite.</para>
97    </important>
98
99    <para os="m">Use the following commands to run the test suite and output
100    any test failures:</para>
101
102<!-- items n,o,p no longer the master, use x86_64 which has no failures -->
103
104<screen os="n"><userinput remap="test">make check</userinput></screen>
105
106    <para os="o">The Glibc test suite is highly dependent on certain functions of
107    the host system, in particular the kernel. The <emphasis>posix/annexc</emphasis> and
108    <emphasis>conform/run-conformtest</emphasis> tests normally fail
109    and you should see <literal>Error 1 (ignored)</literal> in the output. Apart
110    from this, the Glibc test suite is always expected to pass. However, in certain
111    circumstances, some failures are unavoidable. If a test fails because of a missing
112    program (or missing symbolic link), or a segfault, you will see an error code
113    greater than 127 and the details will be in the log. More commonly, tests will
114    fail with <literal>Error 2</literal> - for these, the contents of the corresponding
115    <filename>.out</filename> file, e.g. <filename>posix/annexc.out</filename> may be
116    informative. Here is a list of the most common issues:</para>
117
118    <itemizedlist os="p">
119      <listitem>
120        <para>The <emphasis>nptl/tst-clock2</emphasis>,
121        <emphasis>nptl/tst-attr3</emphasis>,
122        <emphasis>tst/tst-cputimer1</emphasis>, and
123        <emphasis>rt/tst-cpuclock2</emphasis>
124        tests have been known to fail.  The
125        reason is not completely understood, but indications are that minor
126        timing issues can trigger these failures.</para>
127      </listitem>
128      <listitem>
129        <para>The <emphasis>math</emphasis> tests sometimes fail.
130        Certain optimization settings are known to be a
131        factor here.</para>
132      </listitem>
133      <listitem>
134        <para>If you have mounted the CLFS partition with the
135        <parameter>noatime</parameter> option, the <emphasis>atime</emphasis> test
136        will fail. As mentioned in <xref linkend="ch-partitioning-mounting"/>,
137        do not use the <parameter>noatime</parameter> option while building
138        CLFS.</para>
139      </listitem>
140      <listitem>
141        <para>When running on older and slower hardware, some tests
142        can fail because of test timeouts being exceeded.
143        Modifying the make check command to set a TIMEOUTFACTOR is reported to
144        help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
145        make -k check</command>).</para>
146      </listitem>
147      <listitem>
148        <para>posix/tst-getaddrinfo4 will always fail due to not having a network
149        connection when the test is run.</para>
150      </listitem>
151    </itemizedlist>
152
153    <para os="q">Though it is a harmless message, the install stage of Glibc will
154    complain about the absence of <filename>/etc/ld.so.conf</filename>.
155    Prevent this warning with:</para>
156
157<screen os="r"><userinput>touch /etc/ld.so.conf</userinput></screen>
158
159    <para os="s">Install the package, and remove unneeded files from
160    <filename class="directory">/usr/include/rpcsvc</filename>:</para>
161
162<screen os="t"><userinput>make install &amp;&amp;
163rm -v /usr/include/rpcsvc/*.x</userinput></screen>
164
165    <para os="u">Install the configuration file and runtime directory for
166    <command>nscd</command>:</para>
167
168<screen os="v"><userinput>cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
169mkdir -pv /var/cache/nscd</userinput></screen>
170
171    <para os="w">Install the systemd support files for <command>nscd</command>:</para>
172
173<screen os="x"><userinput>install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
174install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
175
176  </sect2>
177
178  <sect2 id="i18n-glibc" role="configuration">
179    <title>Internationalization</title>
180
181    <para>The locales that can make the system respond in a different
182    language were not installed by the above command. Install them
183    with:</para>
184
185<screen><userinput>make localedata/install-locales</userinput></screen>
186
187    <para>To save time, an alternative to running the previous command (which
188    generates and installs every locale listed in the
189    <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file) is
190    to install only those locales that are wanted and needed. This can be
191    achieved by using the <command>localedef</command> command. Information on
192    this command is located in the <filename>INSTALL</filename> file in the
193    Glibc source. However, there are a number of locales that are essential in
194    order for the tests of future packages to pass, in particular, the
195    <emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
196    instead of the <parameter>install-locales</parameter> target used above,
197    will install the minimum set of locales necessary for the tests to run
198    successfully:</para>
199
200<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
201localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
202localedef -i de_DE -f ISO-8859-1 de_DE
203localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
204localedef -i en_HK -f ISO-8859-1 en_HK
205localedef -i en_PH -f ISO-8859-1 en_PH
206localedef -i en_US -f ISO-8859-1 en_US
207localedef -i es_MX -f ISO-8859-1 es_MX
208localedef -i fa_IR -f UTF-8 fa_IR
209localedef -i fr_FR -f ISO-8859-1 fr_FR
210localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
211localedef -i it_IT -f ISO-8859-1 it_IT
212localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
213
214    <para>Some locales installed by the <command>make
215    localedata/install-locales</command> command above are not properly
216    supported by some applications that are in CLFS and CBLFS. Because
217    of the various problems that arise due to application programmers making
218    assumptions that break in such locales, CLFS should not be used in locales
219    that utilize multibyte character sets (including UTF-8) or right-to-left
220    writing order.  Numerous unofficial and unstable patches are required to
221    fix these problems, and it has been decided by the CLFS developers not to
222    support such complex locales at this time. This applies to the ja_JP and
223    fa_IR locales as well&mdash;they have been installed only for GCC and
224    Gettext tests to pass, and the <command>watch</command> program (part of
225    the Procps-ng package) does not work properly in them. Various attempts to
226    circumvent these restrictions are documented in internationalization-related
227    hints.</para>
228
229  </sect2>
230
231  <sect2 id="conf-glibc" role="configuration">
232    <title>Configuring Glibc</title>
233
234    <indexterm zone="conf-glibc">
235      <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
236    </indexterm>
237
238    <indexterm zone="conf-glibc">
239      <primary sortas="e-/etc/localtime">/etc/localtime</primary>
240    </indexterm>
241
242    <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
243    because, although Glibc provides defaults when this file is missing or
244    corrupt, the Glibc defaults do not work well in a networked environment.
245    The time zone also needs to be configured.</para>
246
247    <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
248    the following:</para>
249
250<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
251<literal># Begin /etc/nsswitch.conf
252
253passwd: files
254group: files
255shadow: files
256
257hosts: files dns
258networks: files
259
260protocols: files
261services: files
262ethers: files
263rpc: files
264
265# End /etc/nsswitch.conf</literal>
266EOF</userinput></screen>
267
268    <para>Install timezone data:</para>
269<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
270
271ZONEINFO=/usr/share/zoneinfo
272mkdir -pv $ZONEINFO/{posix,right}
273
274for tz in etcetera southamerica northamerica europe africa antarctica \
275          asia australasia backward pacificnew systemv; do
276    zic -L /dev/null   -d $ZONEINFO       -y "sh yearistype.sh" ${tz}
277    zic -L /dev/null   -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
278    zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
279done
280
281cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
282zic -d $ZONEINFO -p America/New_York
283unset ZONEINFO</userinput></screen>
284
285    <variablelist>
286      <title>The meaning of the zic commands:</title>
287
288      <varlistentry>
289        <term><parameter>zic -L /dev/null ...</parameter></term>
290        <listitem>
291          <para>This creates posix timezones, without any leap seconds.  It is
292          conventional to put these in both
293          <filename class="directory">zoneinfo</filename> and
294          <filename class="directory">zoneinfo/posix</filename>. It is
295          necessary to put the POSIX timezones in
296          <filename class="directory">zoneinfo</filename>, otherwise various
297          test-suites will report errors. On an embedded system, where space is
298          tight and you do not intend to ever update the timezones, you could save
299          1.9MB by not using the <filename class="directory">posix</filename>
300          directory, but some applications or test-suites might give less good
301          results</para>
302        </listitem>
303      </varlistentry>
304      <varlistentry>
305        <term><parameter>zic -L leapseconds ...</parameter></term>
306        <listitem>
307          <para>This creates right timezones, including leap seconds. On an
308          embedded system, where space is tight and you do not intend to
309          ever update the timezones, or care about the correct time, you could
310          save 1.9MB by omitting the <filename class="directory">right</filename>
311          directory.</para>
312        </listitem>
313      </varlistentry>
314      <varlistentry>
315        <term><parameter>zic ... -p ...</parameter></term>
316        <listitem>
317          <para>This creates the <filename>posixrules</filename> file. We use
318          New York because POSIX requires the daylight savings time rules
319          to be in accordance with US rules.</para>
320        </listitem>
321      </varlistentry>
322    </variablelist>
323
324    <para>To determine the local time zone, run the following script:</para>
325
326<screen role="nodump"><userinput>tzselect</userinput></screen>
327
328    <para>After answering a few questions about the location, the script will
329    output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
330    <emphasis>Canada/Eastern</emphasis>). Then create the
331    <filename>/etc/localtime</filename> file by running:</para>
332
333<screen><userinput>cp -v /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
334    /etc/localtime</userinput></screen>
335
336    <para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
337    that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
338
339  </sect2>
340
341  <sect2 id="conf-ld" role="configuration">
342    <title>Configuring The Dynamic Loader</title>
343
344    <indexterm zone="conf-ld">
345      <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
346    </indexterm>
347
348    <para os="ld-a">By default, the dynamic loader (<filename
349    class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
350    <filename class="directory">/lib</filename> and <filename
351    class="directory">/usr/lib</filename> for dynamic libraries that are
352    needed by programs as they are run. However, if there are libraries in
353    directories other than <filename class="directory">/lib</filename> and
354    <filename class="directory">/usr/lib</filename>, these need to be
355    added to the <filename>/etc/ld.so.conf</filename> file in order
356    for the dynamic loader to find them. Two directories that are commonly
357    known to contain additional libraries are <filename
358    class="directory">/usr/local/lib</filename> and <filename
359    class="directory">/opt/lib</filename>, so add those directories to the
360    dynamic loader's search path.</para>
361
362    <para os="ld-b">Create a new file <filename>/etc/ld.so.conf</filename> by running the
363    following:</para>
364
365<screen os="ld-c"><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
366<literal># Begin /etc/ld.so.conf
367
368/usr/local/lib
369/opt/lib
370
371# End /etc/ld.so.conf</literal>
372EOF</userinput></screen>
373
374  </sect2>
375
376  <sect2 id="contents-glibc" role="content">
377    <title>Contents of Glibc</title>
378
379    <segmentedlist>
380      <segtitle>Installed programs</segtitle>
381      <segtitle>Installed libraries</segtitle>
382      <segtitle>Installed directories</segtitle>
383
384      <seglistitem>
385        <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
386        ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd,
387        pcprofiledump, pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
388        zdump, zic</seg>
389        <seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
390        libc.[a,so], libc_nonshared.a, libcidn.[a,so], libcrypt.[a,so],
391        libdl.[a,so], libg.a, libieee.a, libm.[a,so], libmcheck.a,
392        libmemusage.so, libnsl.a, libnss_compat.so, libnss_dns.so,
393        libnss_files.so, libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so,
394        libpcprofile.so, libpthread.[a,so], libpthread_nonshared.a,
395        libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so,
396        libutil.[a,so]</seg>
397        <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
398        /usr/include/net, /usr/include/netash, /usr/include/netatalk,
399        /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
400        /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
401        /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
402        /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
403        /usr/include/scsi, /usr/include/sys, /usr/lib/audit, /usr/lib/gconv,
404        /usr/lib/glibc, /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo,
405        /var/cache/ldconfig, /var/cache/nscd</seg>
406      </seglistitem>
407    </segmentedlist>
408
409    <variablelist>
410      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
411      <?dbfo list-presentation="list"?>
412      <?dbhtml list-presentation="table"?>
413
414      <varlistentry id="catchsegv">
415        <term><command>catchsegv</command></term>
416        <listitem>
417          <para>Can be used to create a stack trace when a program
418          terminates with a segmentation fault</para>
419          <indexterm zone="ch-system-glibc catchsegv">
420            <primary sortas="b-catchsegv">catchsegv</primary>
421          </indexterm>
422        </listitem>
423      </varlistentry>
424
425      <varlistentry id="gencat">
426        <term><command>gencat</command></term>
427        <listitem>
428          <para>Generates message catalogues</para>
429          <indexterm zone="ch-system-glibc gencat">
430            <primary sortas="b-gencat">gencat</primary>
431          </indexterm>
432        </listitem>
433      </varlistentry>
434
435      <varlistentry id="getconf">
436        <term><command>getconf</command></term>
437        <listitem>
438          <para>Displays the system configuration values for file system specific
439          variables</para>
440          <indexterm zone="ch-system-glibc getconf">
441            <primary sortas="b-getconf">getconf</primary>
442          </indexterm>
443        </listitem>
444      </varlistentry>
445
446      <varlistentry id="getent">
447        <term><command>getent</command></term>
448        <listitem>
449          <para>Gets entries from an administrative database</para>
450          <indexterm zone="ch-system-glibc getent">
451            <primary sortas="b-getent">getent</primary>
452          </indexterm>
453        </listitem>
454      </varlistentry>
455
456      <varlistentry id="iconv">
457        <term><command>iconv</command></term>
458        <listitem>
459          <para>Performs character set conversion</para>
460          <indexterm zone="ch-system-glibc iconv">
461            <primary sortas="b-iconv">iconv</primary>
462          </indexterm>
463        </listitem>
464      </varlistentry>
465
466      <varlistentry id="iconvconfig">
467        <term><command>iconvconfig</command></term>
468        <listitem>
469          <para>Creates fastloading <command>iconv</command> module configuration
470          files</para>
471          <indexterm zone="ch-system-glibc iconvconfig">
472            <primary sortas="b-iconvconfig">iconvconfig</primary>
473          </indexterm>
474        </listitem>
475      </varlistentry>
476
477      <varlistentry id="ldconfig">
478        <term><command>ldconfig</command></term>
479        <listitem>
480          <para>Configures the dynamic linker runtime bindings</para>
481          <indexterm zone="ch-system-glibc ldconfig">
482            <primary sortas="b-ldconfig">ldconfig</primary>
483          </indexterm>
484        </listitem>
485      </varlistentry>
486
487      <varlistentry id="ldd">
488        <term><command>ldd</command></term>
489        <listitem>
490          <para>Reports which shared libraries are required
491          by each given program or shared library</para>
492          <indexterm zone="ch-system-glibc ldd">
493            <primary sortas="b-ldd">ldd</primary>
494          </indexterm>
495        </listitem>
496      </varlistentry>
497
498      <varlistentry id="lddlibc4">
499        <term><command>lddlibc4</command></term>
500        <listitem>
501          <para>Assists <command>ldd</command> with object files</para>
502          <indexterm zone="ch-system-glibc lddlibc4">
503            <primary sortas="b-lddlibc4">lddlibc4</primary>
504          </indexterm>
505        </listitem>
506      </varlistentry>
507
508      <varlistentry id="locale">
509        <term><command>locale</command></term>
510        <listitem>
511          <para>Tells the compiler to enable or disable the use of POSIX locales
512          for built-in operations</para>
513          <indexterm zone="ch-system-glibc locale">
514            <primary sortas="b-locale">locale</primary>
515          </indexterm>
516        </listitem>
517      </varlistentry>
518
519      <varlistentry id="localedef">
520        <term><command>localedef</command></term>
521        <listitem>
522          <para>Compiles locale specifications</para>
523          <indexterm zone="ch-system-glibc localedef">
524            <primary sortas="b-localedef">localedef</primary>
525          </indexterm>
526        </listitem>
527      </varlistentry>
528
529      <varlistentry id="makedb">
530        <term><command>makedb</command></term>
531        <listitem>
532          <para>Creates a simple database from textual input</para>
533          <indexterm zone="ch-system-glibc makedb">
534            <primary sortas="b-makedb">makedb</primary>
535          </indexterm>
536        </listitem>
537      </varlistentry>
538
539      <varlistentry id="mtrace">
540        <term><command>mtrace</command></term>
541        <listitem>
542          <para>Reads and interprets a memory trace file and
543          displays a summary in human-readable format</para>
544          <indexterm zone="ch-system-glibc mtrace">
545            <primary sortas="b-mtrace">mtrace</primary>
546          </indexterm>
547        </listitem>
548      </varlistentry>
549
550      <varlistentry id="nscd">
551        <term><command>nscd</command></term>
552        <listitem>
553          <para>A daemon that provides a cache for the most common name
554          service requests</para>
555          <indexterm zone="ch-system-glibc nscd">
556            <primary sortas="b-nscd">nscd</primary>
557          </indexterm>
558        </listitem>
559      </varlistentry>
560
561      <varlistentry id="pcprofiledump">
562        <term><command>pcprofiledump</command></term>
563        <listitem>
564          <para>Dumps information generated by PC profiling</para>
565          <indexterm zone="ch-system-glibc pcprofiledump">
566            <primary sortas="b-pcprofiledump">pcprofiledump</primary>
567          </indexterm>
568        </listitem>
569      </varlistentry>
570
571      <varlistentry id="pldd">
572        <term><command>pldd</command></term>
573        <listitem>
574          <para>Lists dynamic shared objects used by running processes</para>
575          <indexterm zone="ch-system-glibc pldd">
576            <primary sortas="b-pldd">pldd</primary>
577          </indexterm>
578        </listitem>
579      </varlistentry>
580
581      <varlistentry id="rpcgen">
582        <term><command>rpcgen</command></term>
583        <listitem>
584          <para>Generates C code to implement the Remote Procecure Call (RPC)
585          protocol</para>
586          <indexterm zone="ch-system-glibc rpcgen">
587            <primary sortas="b-rpcgen">rpcgen</primary>
588          </indexterm>
589        </listitem>
590      </varlistentry>
591
592      <varlistentry id="sln">
593        <term><command>sln</command></term>
594        <listitem>
595          <para>A statically linked program that creates symbolic links</para>
596          <indexterm zone="ch-system-glibc sln">
597            <primary sortas="b-sln">sln</primary>
598          </indexterm>
599        </listitem>
600      </varlistentry>
601
602      <varlistentry id="sotruss">
603        <term><command>sotruss</command></term>
604        <listitem>
605          <para>Traces shared library procedure calls of a specified command</para>
606          <indexterm zone="ch-system-glibc sotruss">
607            <primary sortas="b-sotruss">sotruss</primary>
608          </indexterm>
609        </listitem>
610      </varlistentry>
611
612      <varlistentry id="sprof">
613        <term><command>sprof</command></term>
614        <listitem>
615          <para>Reads and displays shared object profiling data</para>
616          <indexterm zone="ch-system-glibc sprof">
617            <primary sortas="b-sprof">sprof</primary>
618          </indexterm>
619        </listitem>
620      </varlistentry>
621
622      <varlistentry id="tzselect">
623        <term><command>tzselect</command></term>
624        <listitem>
625          <para>Asks the user about the location of the
626          system and reports the corresponding time zone description</para>
627          <indexterm zone="ch-system-glibc tzselect">
628            <primary sortas="b-tzselect">tzselect</primary>
629          </indexterm>
630        </listitem>
631      </varlistentry>
632
633      <varlistentry id="xtrace">
634        <term><command>xtrace</command></term>
635        <listitem>
636          <para>Traces the execution of a program by
637          printing the currently executed function</para>
638          <indexterm zone="ch-system-glibc xtrace">
639            <primary sortas="b-xtrace">xtrace</primary>
640          </indexterm>
641        </listitem>
642      </varlistentry>
643
644      <varlistentry id="zdump">
645        <term><command>zdump</command></term>
646        <listitem>
647          <para>The time zone dumper</para>
648          <indexterm zone="ch-system-glibc zdump">
649            <primary sortas="b-zdump">zdump</primary>
650          </indexterm>
651        </listitem>
652      </varlistentry>
653
654      <varlistentry id="zic">
655        <term><command>zic</command></term>
656        <listitem>
657          <para>The time zone compiler</para>
658          <indexterm zone="ch-system-glibc zic">
659            <primary sortas="b-zic">zic</primary>
660          </indexterm>
661        </listitem>
662      </varlistentry>
663
664      <varlistentry id="ld.so">
665        <term><filename class="libraryfile">ld.so</filename></term>
666        <listitem>
667          <para>The helper program for shared library executables</para>
668          <indexterm zone="ch-system-glibc ld.so">
669            <primary sortas="c-ld.so">ld.so</primary>
670          </indexterm>
671        </listitem>
672      </varlistentry>
673
674      <varlistentry id="libBrokenLocale">
675        <term><filename class="libraryfile">libBrokenLocale</filename></term>
676        <listitem>
677          <para>Used by programs, such as Mozilla, to solve broken locales</para>
678          <indexterm zone="ch-system-glibc libBrokenLocale">
679            <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
680          </indexterm>
681        </listitem>
682      </varlistentry>
683
684      <varlistentry id="libSegFault">
685        <term><filename class="libraryfile">libSegFault</filename></term>
686        <listitem>
687          <para>The segmentation fault signal handler</para>
688          <indexterm zone="ch-system-glibc libSegFault">
689            <primary sortas="c-libSegFault">libSegFault</primary>
690          </indexterm>
691        </listitem>
692      </varlistentry>
693
694      <varlistentry id="libanl">
695        <term><filename class="libraryfile">libanl</filename></term>
696        <listitem>
697          <para>An asynchronous name lookup library</para>
698          <indexterm zone="ch-system-glibc libanl">
699            <primary sortas="c-libanl">libanl</primary>
700          </indexterm>
701        </listitem>
702      </varlistentry>
703
704      <varlistentry id="libc">
705        <term><filename class="libraryfile">libc</filename></term>
706        <listitem>
707          <para>The main C library</para>
708          <indexterm zone="ch-system-glibc libc">
709            <primary sortas="c-libc">libc</primary>
710          </indexterm>
711        </listitem>
712      </varlistentry>
713
714      <varlistentry id="libcidn">
715        <term><filename class="libraryfile">libcidn</filename></term>
716        <listitem>
717          <para>Used internally by Glibc for handling internationalized domain
718          names in the <function>getaddrinfo()</function> function</para>
719          <indexterm zone="ch-system-glibc libcidn">
720            <primary sortas="c-libcidn">libcidn</primary>
721          </indexterm>
722        </listitem>
723      </varlistentry>
724
725      <varlistentry id="libcrypt">
726        <term><filename class="libraryfile">libcrypt</filename></term>
727        <listitem>
728          <para>The cryptography library</para>
729          <indexterm zone="ch-system-glibc libcrypt">
730            <primary sortas="c-libcrypt">libcrypt</primary>
731          </indexterm>
732        </listitem>
733      </varlistentry>
734
735      <varlistentry id="libdl">
736        <term><filename class="libraryfile">libdl</filename></term>
737        <listitem>
738          <para>The dynamic linking interface library</para>
739          <indexterm zone="ch-system-glibc libdl">
740            <primary sortas="c-libdl">libdl</primary>
741          </indexterm>
742        </listitem>
743      </varlistentry>
744
745      <varlistentry id="libg">
746        <term><filename class="libraryfile">libg</filename></term>
747        <listitem>
748          <para>A runtime library for <command>g++</command></para>
749          <indexterm zone="ch-system-glibc libg">
750            <primary sortas="c-libg">libg</primary>
751          </indexterm>
752        </listitem>
753      </varlistentry>
754
755      <varlistentry id="libieee">
756        <term><filename class="libraryfile">libieee</filename></term>
757        <listitem>
758          <para>The Institute of Electrical and Electronic Engineers (IEEE)
759          floating point library</para>
760          <indexterm zone="ch-system-glibc libieee">
761            <primary sortas="c-libieee">libieee</primary>
762          </indexterm>
763        </listitem>
764      </varlistentry>
765
766      <varlistentry id="libm">
767        <term><filename class="libraryfile">libm</filename></term>
768        <listitem>
769          <para>The mathematical library</para>
770          <indexterm zone="ch-system-glibc libm">
771            <primary sortas="c-libm">libm</primary>
772          </indexterm>
773        </listitem>
774      </varlistentry>
775
776      <varlistentry id="libmcheck">
777        <term><filename class="libraryfile">libmcheck</filename></term>
778        <listitem>
779          <para>Contains code run at boot</para>
780          <indexterm zone="ch-system-glibc libmcheck">
781            <primary sortas="c-libmcheck">libmcheck</primary>
782          </indexterm>
783        </listitem>
784      </varlistentry>
785
786      <varlistentry id="libmemusage">
787        <term><filename class="libraryfile">libmemusage</filename></term>
788        <listitem>
789          <para>Used by <command>memusage</command> (included in Glibc, but
790          not built in a base CLFS system as it has additional dependencies)
791          to help collect information about the memory usage of a program</para>
792          <indexterm zone="ch-system-glibc libmemusage">
793            <primary sortas="c-libmemusage">libmemusage</primary>
794          </indexterm>
795        </listitem>
796      </varlistentry>
797
798      <varlistentry id="libnsl">
799        <term><filename class="libraryfile">libnsl</filename></term>
800        <listitem>
801          <para>The network services library</para>
802          <indexterm zone="ch-system-glibc libnsl">
803            <primary sortas="c-libnsl">libnsl</primary>
804          </indexterm>
805        </listitem>
806      </varlistentry>
807
808      <varlistentry id="libnss">
809        <term><filename class="libraryfile">libnss</filename></term>
810        <listitem>
811          <para>The Name Service Switch libraries, containing functions for
812          resolving host names, user names, group names, aliases, services,
813          protocols, etc.</para>
814          <indexterm zone="ch-system-glibc libnss">
815            <primary sortas="c-libnss">libnss</primary>
816          </indexterm>
817        </listitem>
818      </varlistentry>
819
820      <varlistentry id="libpcprofile">
821        <term><filename class="libraryfile">libpcprofile</filename></term>
822        <listitem>
823          <para>Contains profiling functions used to track the amount of CPU
824          time spent in specific source code lines</para>
825          <indexterm zone="ch-system-glibc libpcprofile">
826            <primary sortas="c-libpcprofile">libpcprofile</primary>
827          </indexterm>
828        </listitem>
829      </varlistentry>
830
831      <varlistentry id="libpthread">
832        <term><filename class="libraryfile">libpthread</filename></term>
833        <listitem>
834          <para>The POSIX threads library</para>
835          <indexterm zone="ch-system-glibc libpthread">
836            <primary sortas="c-libpthread">libpthread</primary>
837          </indexterm>
838        </listitem>
839      </varlistentry>
840
841      <varlistentry id="libresolv">
842        <term><filename class="libraryfile">libresolv</filename></term>
843        <listitem>
844          <para>Contains functions for creating, sending, and interpreting
845          packets to the Internet domain name servers</para>
846          <indexterm zone="ch-system-glibc libresolv">
847            <primary sortas="c-libresolv">libresolv</primary>
848          </indexterm>
849        </listitem>
850      </varlistentry>
851
852      <varlistentry id="librpcsvc">
853        <term><filename class="libraryfile">librpcsvc</filename></term>
854        <listitem>
855          <para>Contains functions providing miscellaneous RPC services</para>
856          <indexterm zone="ch-system-glibc librpcsvc">
857            <primary sortas="c-librpcsvc">librpcsvc</primary>
858          </indexterm>
859        </listitem>
860      </varlistentry>
861
862      <varlistentry id="librt">
863        <term><filename class="libraryfile">librt</filename></term>
864        <listitem>
865          <para>Contains functions providing most of the interfaces specified by
866          the POSIX.1b Realtime Extension</para>
867          <indexterm zone="ch-system-glibc librt">
868            <primary sortas="c-librt">librt</primary>
869          </indexterm>
870        </listitem>
871      </varlistentry>
872
873      <varlistentry id="libthread_db">
874        <term><filename class="libraryfile">libthread_db</filename></term>
875        <listitem>
876          <para>Contains functions useful for
877          building debuggers for multi-threaded programs</para>
878          <indexterm zone="ch-system-glibc libthread_db">
879            <primary sortas="c-libthread_db">libthread_db</primary>
880          </indexterm>
881        </listitem>
882      </varlistentry>
883
884      <varlistentry id="libutil">
885        <term><filename class="libraryfile">libutil</filename></term>
886        <listitem>
887          <para>Contains code for <quote>standard</quote> functions used in
888          many different Unix utilities</para>
889          <indexterm zone="ch-system-glibc libutil">
890            <primary sortas="c-libutil">libutil</primary>
891          </indexterm>
892        </listitem>
893      </varlistentry>
894
895    </variablelist>
896
897  </sect2>
898
899</sect1>
Note: See TracBrowser for help on using the repository browser.