source: chapter06/glibc.xml@ 471ca8f

7.9-rc1
Last change on this file since 471ca8f was 471ca8f, checked in by Bruce Dubbs <bdubbs@…>, 6 years ago

7.9-rc1

git-svn-id: http://svn.linuxfromscratch.org/LFS/tags/7.9-rc1@11012 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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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 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-system-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Glibc package contains the main C library. This library provides
27 the basic routines for allocating memory, searching directories, opening and
28 closing files, reading and writing files, string handling, pattern matching,
29 arithmetic, and so on.</para>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-ch6-sbu;</seg>
37 <seg>&glibc-ch6-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <note>
47 <para>Some packages outside of LFS suggest installing GNU libiconv in
48 order to translate data from one encoding to another. The project's
49 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
50 <quote>This library provides an <function>iconv()</function>
51 implementation, for use on systems which don't have one, or whose
52 implementation cannot convert from/to Unicode.</quote> Glibc provides
53 an <function>iconv()</function> implementation and can convert from/to
54 Unicode, therefore libiconv is not required on an LFS system.</para>
55 </note>
56
57 <para>Some of the Glibc programs use non-FHS compilant
58 <filename class="directory">/var/db</filename> directory to store
59 their runtime data. Apply the following patch to make such programs
60 store their runtime data in the FHS-compliant locations:</para>
61
62<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
63
64 <para>The Glibc build system is self-contained and will install
65 perfectly, even though the compiler specs file and linker are still
66 pointing at <filename class="directory">/tools</filename>. The specs
67 and linker cannot be adjusted before the Glibc install because the
68 Glibc autoconf tests would give false results and defeat the goal
69 of achieving a clean build.</para>
70
71 <para>Now fix a build problem that affects i386 systems:</para>
72
73<screen><userinput remap="pre">patch -Np1 -i ../&glibc-upstream-patch;</userinput></screen>
74
75 <para>The most recent stable version of Glibc does not handle large files
76 correctly. Fix the problem with this patch:</para>
77
78<screen><userinput remap="pre">patch -Np1 -i ../&glibc-largefile-patch;</userinput></screen>
79
80 <para>The Glibc documentation recommends building Glibc
81 in a dedicated build directory:</para>
82
83<screen><userinput remap="pre">mkdir -v build
84cd build</userinput></screen>
85
86 <para>Prepare Glibc for compilation:</para>
87
88<screen><userinput remap="configure">../configure --prefix=/usr \
89 --disable-profile \
90 --enable-kernel=&min-kernel; \
91 --enable-obsolete-rpc</userinput></screen>
92
93 <para>Compile the package:</para>
94
95<screen><userinput remap="make">make</userinput></screen>
96
97 <important>
98 <para>In this section, the test suite for Glibc is considered critical.
99 Do not skip it under any circumstance.</para>
100 </important>
101
102 <para>Generally a few tests do not pass, but you can generally ignore
103 any of the test failures listed below. Now test the build results:</para>
104
105<screen><userinput remap="test">make check</userinput></screen>
106
107 <para>You will probably see some test failures. The Glibc test suite is
108 somewhat dependent on the host system. This is a list of the most common
109 issues seen for this version of LFS:</para>
110
111 <itemizedlist>
112
113 <listitem>
114 <para><emphasis>posix/tst-getaddrinfo4</emphasis> will always fail due
115 to not having the necessary networking applications when the tests are
116 run.</para>
117 </listitem>
118
119 <listitem>
120 <para>The <emphasis>rt/tst-cputimer1</emphasis> and
121 <emphasis>rt/tst-cpuclock2</emphasis> tests have been known to
122 fail. The reason is not completely understood, but indications are
123 that minor timing issues can trigger these failures.</para>
124 </listitem>
125
126 <listitem>
127 <para>The math tests sometimes fail when running on
128 systems where the CPU is not a relatively new genuine Intel or
129 authentic AMD processor.</para>
130 </listitem>
131
132 <listitem>
133 <para>The <emphasis>elf/tst-protected1a</emphasis> and
134 <emphasis>elf/tst-protected1b</emphasis> tests are known to
135 fail with the current stable version of binutils.</para>
136 </listitem>
137<!--
138 <listitem>
139 <para>When running on older and slower hardware or on systems under
140 load, some tests can fail because of test timeouts being exceeded.
141 Modifying the make check command to set a TIMEOUTFACTOR is reported to
142 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
143 make -k check</command>).</para>
144 </listitem>
145-->
146<!--
147 <listitem>
148 <para>libio/tst-ftell-partial-wide.out fails because it needs a locale
149 that has not yet been generated.</para>
150 </listitem>
151-->
152 <listitem>
153 <para>Other tests known to fail on some architectures are
154 malloc/tst-malloc-usable and nptl/tst-cleanupx4. </para>
155 </listitem>
156
157 </itemizedlist>
158
159 <para>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><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
164
165 <para>Install the package:</para>
166
167<screen><userinput remap="install">make install</userinput></screen>
168
169 <para>Install the configuration file and runtime directory for
170 <command>nscd</command>:</para>
171
172<screen><userinput remap="install">cp -v ../nscd/nscd.conf /etc/nscd.conf
173mkdir -pv /var/cache/nscd</userinput></screen>
174
175 <para>The locales that can make the system respond in a different language
176 were not installed by the above command. None of the locales are required,
177 but if some of them are missing, test suites of the future packages would
178 skip important testcases.</para>
179
180 <para>Individual locales can be installed using the
181 <command>localedef</command> program. E.g., the first
182 <command>localedef</command> command below combines the
183 <filename>/usr/share/i18n/locales/cs_CZ</filename>
184 charset-independent locale definition with the
185 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
186 charmap definition and appends the result to the
187 <filename>/usr/lib/locale/locale-archive</filename> file.
188 The following instructions will install the minimum set of
189 locales necessary for the optimal coverage of tests:</para>
190
191<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
192localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
193localedef -i de_DE -f ISO-8859-1 de_DE
194localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
195localedef -i de_DE -f UTF-8 de_DE.UTF-8
196localedef -i en_GB -f UTF-8 en_GB.UTF-8
197localedef -i en_HK -f ISO-8859-1 en_HK
198localedef -i en_PH -f ISO-8859-1 en_PH
199localedef -i en_US -f ISO-8859-1 en_US
200localedef -i en_US -f UTF-8 en_US.UTF-8
201localedef -i es_MX -f ISO-8859-1 es_MX
202localedef -i fa_IR -f UTF-8 fa_IR
203localedef -i fr_FR -f ISO-8859-1 fr_FR
204localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
205localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
206localedef -i it_IT -f ISO-8859-1 it_IT
207localedef -i it_IT -f UTF-8 it_IT.UTF-8
208localedef -i ja_JP -f EUC-JP ja_JP
209localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
210localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
211localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
212localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
213
214 <para>In addition, install the locale for your own country, language and
215 character set.</para>
216
217 <para>Alternatively, install all locales listed in the
218 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
219 (it includes every locale listed above and many more) at once with the
220 following time-consuming command:</para>
221
222<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
223
224 <para>Then use the <command>localedef</command> command to create and
225 install locales not listed in the
226 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
227 in the unlikely case you need them.</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 <sect3>
243 <title>Adding nsswitch.conf</title>
244
245 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
246 because the Glibc defaults do not work well in a networked environment.
247 </para>
248
249 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
250 following:</para>
251
252<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
253<literal># Begin /etc/nsswitch.conf
254
255passwd: files
256group: files
257shadow: files
258
259hosts: files dns
260networks: files
261
262protocols: files
263services: files
264ethers: files
265rpc: files
266
267# End /etc/nsswitch.conf</literal>
268EOF</userinput></screen>
269
270 </sect3>
271
272 <sect3>
273 <title>Adding time zone data</title>
274
275 <para>Install and set up the time zone data with the following:</para>
276<screen><userinput>tar -xf ../../tzdata&tzdata-version;.tar.gz
277
278ZONEINFO=/usr/share/zoneinfo
279mkdir -pv $ZONEINFO/{posix,right}
280
281for tz in etcetera southamerica northamerica europe africa antarctica \
282 asia australasia backward pacificnew 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 zone1970.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 time zones, 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 time zones 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 time zones, you could save
306 1.9MB by not using the <filename class="directory">posix</filename>
307 directory, but some applications or test-suites might produce some
308 failures.</para>
309 </listitem>
310 </varlistentry>
311 <varlistentry>
312 <term><parameter>zic -L leapseconds ...</parameter></term>
313 <listitem>
314 <para>This creates right time zones, including leap seconds. On an
315 embedded system, where space is tight and you do not intend to
316 ever update the time zones, 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
332 <para>One way to determine the local time zone is to run the following
333 script:</para>
334
335<screen role="nodump"><userinput>tzselect</userinput></screen>
336
337 <para>After answering a few questions about the location, the script will
338 output the name of the time zone (e.g.,
339 <emphasis>America/Edmonton</emphasis>). There are also some other possible
340 time zones listed in <filename
341 class='directory'>/usr/share/zoneinfo</filename> such as
342 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
343 are not identified by the script but can be used.</para>
344
345 <para>Then create the <filename>/etc/localtime</filename> file by
346 running:</para>
347
348<screen><userinput>cp -v /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
349
350 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
351 time zone selected (e.g., Canada/Eastern).</para>
352
353 </sect3>
354
355 <sect3 id="conf-ld" role="configuration">
356 <title>Configuring the Dynamic Loader</title>
357
358 <indexterm zone="conf-ld">
359 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
360 </indexterm>
361
362 <para>By default, the dynamic loader (<filename
363 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
364 <filename class="directory">/lib</filename> and <filename
365 class="directory">/usr/lib</filename> for dynamic libraries that are
366 needed by programs as they are run. However, if there are libraries in
367 directories other than <filename class="directory">/lib</filename> and
368 <filename class="directory">/usr/lib</filename>, these need to be added
369 to the <filename>/etc/ld.so.conf</filename> file in order for the
370 dynamic loader to find them. Two directories that are commonly known
371 to contain additional libraries are <filename
372 class="directory">/usr/local/lib</filename> and <filename
373 class="directory">/opt/lib</filename>, so add those directories to the
374 dynamic loader's search path.</para>
375
376 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
377 following:</para>
378
379<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
380<literal># Begin /etc/ld.so.conf
381/usr/local/lib
382/opt/lib
383</literal>
384EOF</userinput></screen>
385
386 <para>If desired, the dynamic loader can also search a directory and
387 include the contents of files found there. Generally the files in
388 this include directory are one line specifying the desired library path.
389 To add this capability run the following commands:</para>
390
391<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
392<literal># Add an include directory
393include /etc/ld.so.conf.d/*.conf
394</literal>
395EOF
396mkdir -pv /etc/ld.so.conf.d</userinput></screen>
397
398 </sect3>
399 </sect2>
400
401 <sect2 id="contents-glibc" role="content">
402 <title>Contents of Glibc</title>
403
404 <segmentedlist>
405 <segtitle>Installed programs</segtitle>
406 <segtitle>Installed libraries</segtitle>
407 <segtitle>Installed directories</segtitle>
408
409 <seglistitem>
410 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
411 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
412 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
413 zdump, and zic</seg>
414 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
415 libc.{a,so}, libc_nonshared.a, libcidn.so,
416 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
417 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
418 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
419 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
420 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
421 libthread_db.so, and libutil.{a,so}</seg>
422 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
423 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
424 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
425 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
426 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
427 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
428 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
429 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
430 /var/cache/nscd, and /var/lib/nss_db</seg>
431 </seglistitem>
432 </segmentedlist>
433
434 <variablelist>
435 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
436 <?dbfo list-presentation="list"?>
437 <?dbhtml list-presentation="table"?>
438
439 <varlistentry id="catchsegv">
440 <term><command>catchsegv</command></term>
441 <listitem>
442 <para>Can be used to create a stack trace when a program
443 terminates with a segmentation fault</para>
444 <indexterm zone="ch-system-glibc catchsegv">
445 <primary sortas="b-catchsegv">catchsegv</primary>
446 </indexterm>
447 </listitem>
448 </varlistentry>
449
450 <varlistentry id="gencat">
451 <term><command>gencat</command></term>
452 <listitem>
453 <para>Generates message catalogues</para>
454 <indexterm zone="ch-system-glibc gencat">
455 <primary sortas="b-gencat">gencat</primary>
456 </indexterm>
457 </listitem>
458 </varlistentry>
459
460 <varlistentry id="getconf">
461 <term><command>getconf</command></term>
462 <listitem>
463 <para>Displays the system configuration values for file system
464 specific variables</para>
465 <indexterm zone="ch-system-glibc getconf">
466 <primary sortas="b-getconf">getconf</primary>
467 </indexterm>
468 </listitem>
469 </varlistentry>
470
471 <varlistentry id="getent">
472 <term><command>getent</command></term>
473 <listitem>
474 <para>Gets entries from an administrative database</para>
475 <indexterm zone="ch-system-glibc getent">
476 <primary sortas="b-getent">getent</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="iconv">
482 <term><command>iconv</command></term>
483 <listitem>
484 <para>Performs character set conversion</para>
485 <indexterm zone="ch-system-glibc iconv">
486 <primary sortas="b-iconv">iconv</primary>
487 </indexterm>
488 </listitem>
489 </varlistentry>
490
491 <varlistentry id="iconvconfig">
492 <term><command>iconvconfig</command></term>
493 <listitem>
494 <para>Creates fastloading <command>iconv</command> module configuration
495 files</para>
496 <indexterm zone="ch-system-glibc iconvconfig">
497 <primary sortas="b-iconvconfig">iconvconfig</primary>
498 </indexterm>
499 </listitem>
500 </varlistentry>
501
502 <varlistentry id="ldconfig">
503 <term><command>ldconfig</command></term>
504 <listitem>
505 <para>Configures the dynamic linker runtime bindings</para>
506 <indexterm zone="ch-system-glibc ldconfig">
507 <primary sortas="b-ldconfig">ldconfig</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="ldd">
513 <term><command>ldd</command></term>
514 <listitem>
515 <para>Reports which shared libraries are required
516 by each given program or shared library</para>
517 <indexterm zone="ch-system-glibc ldd">
518 <primary sortas="b-ldd">ldd</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="lddlibc4">
524 <term><command>lddlibc4</command></term>
525 <listitem>
526 <para>Assists <command>ldd</command> with object files</para>
527 <indexterm zone="ch-system-glibc lddlibc4">
528 <primary sortas="b-lddlibc4">lddlibc4</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="locale">
534 <term><command>locale</command></term>
535 <listitem>
536 <para>Prints various information about the current locale</para>
537 <indexterm zone="ch-system-glibc locale">
538 <primary sortas="b-locale">locale</primary>
539 </indexterm>
540 </listitem>
541 </varlistentry>
542
543 <varlistentry id="localedef">
544 <term><command>localedef</command></term>
545 <listitem>
546 <para>Compiles locale specifications</para>
547 <indexterm zone="ch-system-glibc localedef">
548 <primary sortas="b-localedef">localedef</primary>
549 </indexterm>
550 </listitem>
551 </varlistentry>
552
553 <varlistentry id="makedb">
554 <term><command>makedb</command></term>
555 <listitem>
556 <para>Creates a simple database from textual input</para>
557 <indexterm zone="ch-system-glibc makedb">
558 <primary sortas="b-makedb">makedb</primary>
559 </indexterm>
560 </listitem>
561 </varlistentry>
562
563 <varlistentry id="mtrace">
564 <term><command>mtrace</command></term>
565 <listitem>
566 <para>Reads and interprets a memory trace file and displays a summary
567 in human-readable format</para>
568 <indexterm zone="ch-system-glibc mtrace">
569 <primary sortas="b-mtrace">mtrace</primary>
570 </indexterm>
571 </listitem>
572 </varlistentry>
573
574 <varlistentry id="nscd">
575 <term><command>nscd</command></term>
576 <listitem>
577 <para>A daemon that provides a cache for the most common name
578 service requests</para>
579 <indexterm zone="ch-system-glibc nscd">
580 <primary sortas="b-nscd">nscd</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="pcprofiledump">
586 <term><command>pcprofiledump</command></term>
587 <listitem>
588 <para>Dumps information generated by PC profiling</para>
589 <indexterm zone="ch-system-glibc pcprofiledump">
590 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594
595 <varlistentry id="pldd">
596 <term><command>pldd</command></term>
597 <listitem>
598 <para>Lists dynamic shared objects used by running processes</para>
599 <indexterm zone="ch-system-glibc pldd">
600 <primary sortas="b-pldd">pldd</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604<!--
605 <varlistentry id="pt_chown">
606 <term><command>pt_chown</command></term>
607 <listitem>
608 <para>A helper program for <command>grantpt</command> to set the owner,
609 group and access permissions of a slave pseudo terminal</para>
610 <indexterm zone="ch-system-glibc pt_chown">
611 <primary sortas="b-pt_chown">pt_chown</primary>
612 </indexterm>
613 </listitem>
614 </varlistentry>
615-->
616 <varlistentry id="rpcgen">
617 <term><command>rpcgen</command></term>
618 <listitem>
619 <para>Generates C code to implement the Remote Procedure Call (RPC)
620 protocol</para>
621 <indexterm zone="ch-system-glibc rpcgen">
622 <primary sortas="b-rpcgen">rpcgen</primary>
623 </indexterm>
624 </listitem>
625 </varlistentry>
626
627 <varlistentry id="sln">
628 <term><command>sln</command></term>
629 <listitem>
630 <para>A statically linked <command>ln</command> program</para>
631 <indexterm zone="ch-system-glibc sln">
632 <primary sortas="b-sln">sln</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="sotruss">
638 <term><command>sotruss</command></term>
639 <listitem>
640 <para>Traces shared library procedure calls of a specified command</para>
641 <indexterm zone="ch-system-glibc sotruss">
642 <primary sortas="b-sotruss">sotruss</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="sprof">
648 <term><command>sprof</command></term>
649 <listitem>
650 <para>Reads and displays shared object profiling data</para>
651 <indexterm zone="ch-system-glibc sprof">
652 <primary sortas="b-sprof">sprof</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry>
656
657 <varlistentry id="tzselect">
658 <term><command>tzselect</command></term>
659 <listitem>
660 <para>Asks the user about the location of the system and reports
661 the corresponding time zone description</para>
662 <indexterm zone="ch-system-glibc tzselect">
663 <primary sortas="b-tzselect">tzselect</primary>
664 </indexterm>
665 </listitem>
666 </varlistentry>
667
668 <varlistentry id="xtrace">
669 <term><command>xtrace</command></term>
670 <listitem>
671 <para>Traces the execution of a program by printing the currently
672 executed function</para>
673 <indexterm zone="ch-system-glibc xtrace">
674 <primary sortas="b-xtrace">xtrace</primary>
675 </indexterm>
676 </listitem>
677 </varlistentry>
678
679 <varlistentry id="zdump">
680 <term><command>zdump</command></term>
681 <listitem>
682 <para>The time zone dumper</para>
683 <indexterm zone="ch-system-glibc zdump">
684 <primary sortas="b-zdump">zdump</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="zic">
690 <term><command>zic</command></term>
691 <listitem>
692 <para>The time zone compiler</para>
693 <indexterm zone="ch-system-glibc zic">
694 <primary sortas="b-zic">zic</primary>
695 </indexterm>
696 </listitem>
697 </varlistentry>
698
699 <varlistentry id="ld.so">
700 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
701 <listitem>
702 <para>The helper program for shared library executables</para>
703 <indexterm zone="ch-system-glibc ld.so">
704 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
705 </indexterm>
706 </listitem>
707 </varlistentry>
708
709 <varlistentry id="libBrokenLocale">
710 <term><filename class="libraryfile">libBrokenLocale</filename></term>
711 <listitem>
712 <para>Used internally by Glibc as a gross hack to get broken programs
713 (e.g., some Motif applications) running. See comments in
714 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
715 for more information</para>
716 <indexterm zone="ch-system-glibc libBrokenLocale">
717 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
718 </indexterm>
719 </listitem>
720 </varlistentry>
721
722 <varlistentry id="libSegFault">
723 <term><filename class="libraryfile">libSegFault</filename></term>
724 <listitem>
725 <para>The segmentation fault signal handler, used by
726 <command>catchsegv</command></para>
727 <indexterm zone="ch-system-glibc libSegFault">
728 <primary sortas="c-libSegFault">libSegFault</primary>
729 </indexterm>
730 </listitem>
731 </varlistentry>
732
733 <varlistentry id="libanl">
734 <term><filename class="libraryfile">libanl</filename></term>
735 <listitem>
736 <para>An asynchronous name lookup library</para>
737 <indexterm zone="ch-system-glibc libanl">
738 <primary sortas="c-libanl">libanl</primary>
739 </indexterm>
740 </listitem>
741 </varlistentry>
742
743 <varlistentry id="libc">
744 <term><filename class="libraryfile">libc</filename></term>
745 <listitem>
746 <para>The main C library</para>
747 <indexterm zone="ch-system-glibc libc">
748 <primary sortas="c-libc">libc</primary>
749 </indexterm>
750 </listitem>
751 </varlistentry>
752
753 <varlistentry id="libcidn">
754 <term><filename class="libraryfile">libcidn</filename></term>
755 <listitem>
756 <para>Used internally by Glibc for handling internationalized domain
757 names in the <function>getaddrinfo()</function> function</para>
758 <indexterm zone="ch-system-glibc libcidn">
759 <primary sortas="c-libcidn">libcidn</primary>
760 </indexterm>
761 </listitem>
762 </varlistentry>
763
764 <varlistentry id="libcrypt">
765 <term><filename class="libraryfile">libcrypt</filename></term>
766 <listitem>
767 <para>The cryptography library</para>
768 <indexterm zone="ch-system-glibc libcrypt">
769 <primary sortas="c-libcrypt">libcrypt</primary>
770 </indexterm>
771 </listitem>
772 </varlistentry>
773
774 <varlistentry id="libdl">
775 <term><filename class="libraryfile">libdl</filename></term>
776 <listitem>
777 <para>The dynamic linking interface library</para>
778 <indexterm zone="ch-system-glibc libdl">
779 <primary sortas="c-libdl">libdl</primary>
780 </indexterm>
781 </listitem>
782 </varlistentry>
783
784 <varlistentry id="libg">
785 <term><filename class="libraryfile">libg</filename></term>
786 <listitem>
787 <para>Dummy library containing no functions. Previously was a runtime
788 library for <command>g++</command></para>
789 <indexterm zone="ch-system-glibc libg">
790 <primary sortas="c-libg">libg</primary>
791 </indexterm>
792 </listitem>
793 </varlistentry>
794
795 <varlistentry id="libieee">
796 <term><filename class="libraryfile">libieee</filename></term>
797 <listitem>
798 <para>Linking in this module forces error handling rules for math
799 functions as defined by the Institute of Electrical and Electronic
800 Engineers (IEEE). The default is POSIX.1 error handling</para>
801 <indexterm zone="ch-system-glibc libieee">
802 <primary sortas="c-libieee">libieee</primary>
803 </indexterm>
804 </listitem>
805 </varlistentry>
806
807 <varlistentry id="libm">
808 <term><filename class="libraryfile">libm</filename></term>
809 <listitem>
810 <para>The mathematical library</para>
811 <indexterm zone="ch-system-glibc libm">
812 <primary sortas="c-libm">libm</primary>
813 </indexterm>
814 </listitem>
815 </varlistentry>
816
817 <varlistentry id="libmcheck">
818 <term><filename class="libraryfile">libmcheck</filename></term>
819 <listitem>
820 <para>Turns on memory allocation checking when linked to</para>
821 <indexterm zone="ch-system-glibc libmcheck">
822 <primary sortas="c-libmcheck">libmcheck</primary>
823 </indexterm>
824 </listitem>
825 </varlistentry>
826
827 <varlistentry id="libmemusage">
828 <term><filename class="libraryfile">libmemusage</filename></term>
829 <listitem>
830 <para>Used by <command>memusage</command> to help collect
831 information about the memory usage of a program</para>
832 <indexterm zone="ch-system-glibc libmemusage">
833 <primary sortas="c-libmemusage">libmemusage</primary>
834 </indexterm>
835 </listitem>
836 </varlistentry>
837
838 <varlistentry id="libnsl">
839 <term><filename class="libraryfile">libnsl</filename></term>
840 <listitem>
841 <para>The network services library</para>
842 <indexterm zone="ch-system-glibc libnsl">
843 <primary sortas="c-libnsl">libnsl</primary>
844 </indexterm>
845 </listitem>
846 </varlistentry>
847
848 <varlistentry id="libnss">
849 <term><filename class="libraryfile">libnss</filename></term>
850 <listitem>
851 <para>The Name Service Switch libraries, containing functions for
852 resolving host names, user names, group names, aliases, services,
853 protocols, etc.</para>
854 <indexterm zone="ch-system-glibc libnss">
855 <primary sortas="c-libnss">libnss</primary>
856 </indexterm>
857 </listitem>
858 </varlistentry>
859
860 <varlistentry id="libpcprofile">
861 <term><filename class="libraryfile">libpcprofile</filename></term>
862 <listitem>
863 <para>Contains profiling functions used to track the amount of CPU
864 time spent in specific source code lines</para>
865 <indexterm zone="ch-system-glibc libpcprofile">
866 <primary sortas="c-libpcprofile">libpcprofile</primary>
867 </indexterm>
868 </listitem>
869 </varlistentry>
870
871 <varlistentry id="libpthread">
872 <term><filename class="libraryfile">libpthread</filename></term>
873 <listitem>
874 <para>The POSIX threads library</para>
875 <indexterm zone="ch-system-glibc libpthread">
876 <primary sortas="c-libpthread">libpthread</primary>
877 </indexterm>
878 </listitem>
879 </varlistentry>
880
881 <varlistentry id="libresolv">
882 <term><filename class="libraryfile">libresolv</filename></term>
883 <listitem>
884 <para>Contains functions for creating, sending, and interpreting
885 packets to the Internet domain name servers</para>
886 <indexterm zone="ch-system-glibc libresolv">
887 <primary sortas="c-libresolv">libresolv</primary>
888 </indexterm>
889 </listitem>
890 </varlistentry>
891
892 <varlistentry id="librpcsvc">
893 <term><filename class="libraryfile">librpcsvc</filename></term>
894 <listitem>
895 <para>Contains functions providing miscellaneous RPC services</para>
896 <indexterm zone="ch-system-glibc librpcsvc">
897 <primary sortas="c-librpcsvc">librpcsvc</primary>
898 </indexterm>
899 </listitem>
900 </varlistentry>
901
902 <varlistentry id="librt">
903 <term><filename class="libraryfile">librt</filename></term>
904 <listitem>
905 <para>Contains functions providing most of the interfaces specified
906 by the POSIX.1b Realtime Extension</para>
907 <indexterm zone="ch-system-glibc librt">
908 <primary sortas="c-librt">librt</primary>
909 </indexterm>
910 </listitem>
911 </varlistentry>
912
913 <varlistentry id="libthread_db">
914 <term><filename class="libraryfile">libthread_db</filename></term>
915 <listitem>
916 <para>Contains functions useful for building debuggers for
917 multi-threaded programs</para>
918 <indexterm zone="ch-system-glibc libthread_db">
919 <primary sortas="c-libthread_db">libthread_db</primary>
920 </indexterm>
921 </listitem>
922 </varlistentry>
923
924 <varlistentry id="libutil">
925 <term><filename class="libraryfile">libutil</filename></term>
926 <listitem>
927 <para>Contains code for <quote>standard</quote> functions used in
928 many different Unix utilities</para>
929 <indexterm zone="ch-system-glibc libutil">
930 <primary sortas="c-libutil">libutil</primary>
931 </indexterm>
932 </listitem>
933 </varlistentry>
934
935 </variablelist>
936
937 </sect2>
938
939</sect1>
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