source: chapter06/glibc.xml@ 5897639

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Last change on this file since 5897639 was 5897639, checked in by Bruce Dubbs <bdubbs@…>, 7 years ago

Fix a problem with glibc tests and add some explanations to i
the configure options.

Add a command to touch /root/.vimrc so that the default vim
options don't override those in /etc/vimrc.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11240 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
  • Property mode set to 100644
File size: 34.0 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-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><para>The Glibc build system is self-contained and will install
47 perfectly, even though the compiler specs file and linker are still
48 pointing to <filename class="directory">/tools</filename>. The specs
49 and linker cannot be adjusted before the Glibc install because the
50 Glibc autoconf tests would give false results and defeat the goal
51 of achieving a clean build.</para></note>
52
53 <para>Some of the Glibc programs use non-FHS compilant
54 <filename class="directory">/var/db</filename> directory to store
55 their runtime data. Apply the following patch to make such programs
56 store their runtime data in the FHS-compliant locations:</para>
57
58<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
59
60 <para>Create a symlink for LSB compliance and, for x86_64, a
61 compatibility symlink required for the dynamic loader to function
62 correctly:</para>
63
64<screen><userinput remap="pre">case $(uname -m) in
65 x86) ln -s ld-linux.so.2 /lib/ld-lsb.so.3
66 ;;
67 x86_64) ln -s ../lib/ld-linux-x86-64.so.2 /lib64
68 ln -s ../lib/ld-linux-x86-64.so.2 /lib64/ld-lsb-x86-64.so.3
69 ;;
70esac</userinput></screen>
71
72 <para>The Glibc documentation recommends building Glibc
73 in a dedicated build directory:</para>
74
75<screen><userinput remap="pre">mkdir -v build
76cd build</userinput></screen>
77
78 <para>Prepare Glibc for compilation:</para>
79
80<screen><userinput remap="configure">../configure --prefix=/usr \
81 --disable-werror \
82 --enable-kernel=&min-kernel; \
83 --enable-obsolete-rpc \
84 --enable-stack-protector=strong \
85 libc_cv_slibdir=/lib</userinput></screen>
86
87 <variablelist>
88 <title>The meaning of the new configure options:</title>
89
90 <varlistentry>
91 <term><parameter>--disable-werror</parameter></term>
92 <listitem>
93 <para>This option disables the -Werror option passed to
94 GCC. This is necessary for running the test suite.</para>
95 </listitem>
96 </varlistentry>
97
98 <varlistentry>
99 <term><parameter>--enable-obsolete-rpc</parameter></term>
100 <listitem>
101 <para>This option builds older RPC code for use with
102 network file system utilities (nfs).</para>
103 </listitem>
104 </varlistentry>
105
106 <varlistentry>
107 <term><parameter>--enable-stack-protector=strong</parameter></term>
108 <listitem>
109 <para>This option increases system security by adding a known canary
110 (a random integer) to the stack during a function preamble, and checks
111 it when the function returns. If it changed, there was a stack
112 overflow, and the program aborts.</para>
113 </listitem>
114 </varlistentry>
115
116 <varlistentry>
117 <term><parameter>libc_cv_slibdir=/lib</parameter></term>
118 <listitem>
119 <para>This variable sets the correct library for all
120 systems. We do not want lib64 to be used.</para>
121 </listitem>
122 </varlistentry>
123
124 </variablelist>
125
126 <para>Compile the package:</para>
127
128<screen><userinput remap="make">make</userinput></screen>
129
130 <important>
131 <para>In this section, the test suite for Glibc is considered critical.
132 Do not skip it under any circumstance.</para>
133 </important>
134
135 <para>Generally a few tests do not pass, but you can generally ignore
136 any of the test failures listed below. Now test the build results:</para>
137
138<screen><userinput remap="test">make check</userinput></screen>
139
140 <para>You may see some test failures. The Glibc test suite is
141 somewhat dependent on the host system. This is a list of the most common
142 issues seen for some versions of LFS:</para>
143
144 <itemizedlist>
145
146 <listitem>
147 <para><emphasis>posix/tst-getaddrinfo4</emphasis> and
148 <emphasis>posix/tst-getaddrinfo5</emphasis>
149 may fail on some architectures.</para>
150 </listitem>
151
152 <listitem>
153 <para>The <emphasis>rt/tst-cputimer1</emphasis> and
154 <emphasis>rt/tst-cpuclock2</emphasis> tests have been known to
155 fail. The reason is not completely understood, but indications are
156 that minor timing issues can trigger these failures.</para>
157 </listitem>
158
159 <listitem>
160 <para>The math tests sometimes fail when running on
161 systems where the CPU is not a relatively new Intel or
162 AMD processor.</para>
163 </listitem>
164
165 <listitem>
166 <para>The
167 <emphasis>nptl/tst-thread-affinity-{pthread,pthread2,sched}</emphasis>
168 tests may fail for reasons that have not been determined. </para>
169 </listitem>
170
171 <listitem>
172 <para>Other tests known to fail on some architectures are
173 malloc/tst-malloc-usable and nptl/tst-cleanupx4. </para>
174 </listitem>
175
176 </itemizedlist>
177
178 <para>Though it is a harmless message, the install stage of Glibc will
179 complain about the absence of <filename>/etc/ld.so.conf</filename>.
180 Prevent this warning with:</para>
181
182<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
183
184 <para>Install the package:</para>
185
186<screen><userinput remap="install">make install</userinput></screen>
187
188 <para>Install the configuration file and runtime directory for
189 <command>nscd</command>:</para>
190
191<screen><userinput remap="install">cp -v ../nscd/nscd.conf /etc/nscd.conf
192mkdir -pv /var/cache/nscd</userinput></screen>
193
194 <para revision="systemd">Install the systemd support files for
195 <command>nscd</command>:</para>
196
197 <screen revision="systemd"><userinput remap="install">install -v -Dm644 ../nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
198install -v -Dm644 ../nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
199
200 <para>Next, install the locales that can make the system respond in a
201 different language. None of the locales are required, but if some of them
202 are missing, the test suites of future packages would skip important
203 testcases.</para>
204
205 <para>Individual locales can be installed using the
206 <command>localedef</command> program. E.g., the first
207 <command>localedef</command> command below combines the
208 <filename>/usr/share/i18n/locales/cs_CZ</filename>
209 charset-independent locale definition with the
210 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
211 charmap definition and appends the result to the
212 <filename>/usr/lib/locale/locale-archive</filename> file.
213 The following instructions will install the minimum set of
214 locales necessary for the optimal coverage of tests:</para>
215
216<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
217localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
218localedef -i de_DE -f ISO-8859-1 de_DE
219localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
220localedef -i de_DE -f UTF-8 de_DE.UTF-8
221localedef -i en_GB -f UTF-8 en_GB.UTF-8
222localedef -i en_HK -f ISO-8859-1 en_HK
223localedef -i en_PH -f ISO-8859-1 en_PH
224localedef -i en_US -f ISO-8859-1 en_US
225localedef -i en_US -f UTF-8 en_US.UTF-8
226localedef -i es_MX -f ISO-8859-1 es_MX
227localedef -i fa_IR -f UTF-8 fa_IR
228localedef -i fr_FR -f ISO-8859-1 fr_FR
229localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
230localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
231localedef -i it_IT -f ISO-8859-1 it_IT
232localedef -i it_IT -f UTF-8 it_IT.UTF-8
233localedef -i ja_JP -f EUC-JP ja_JP
234localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
235localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
236localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
237localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
238
239 <para>In addition, install the locale for your own country, language and
240 character set.</para>
241
242 <para>Alternatively, install all locales listed in the
243 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
244 (it includes every locale listed above and many more) at once with the
245 following time-consuming command:</para>
246
247<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
248
249 <para>Then use the <command>localedef</command> command to create and
250 install locales not listed in the
251 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
252 in the unlikely case you need them.</para>
253
254 </sect2>
255
256 <sect2 id="conf-glibc" role="configuration">
257 <title>Configuring Glibc</title>
258
259 <indexterm zone="conf-glibc">
260 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
261 </indexterm>
262
263 <indexterm zone="conf-glibc">
264 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
265 </indexterm>
266
267 <sect3>
268 <title>Adding nsswitch.conf</title>
269
270 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
271 because the Glibc defaults do not work well in a networked environment.
272 </para>
273
274 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
275 following:</para>
276
277<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
278<literal># Begin /etc/nsswitch.conf
279
280passwd: files
281group: files
282shadow: files
283
284hosts: files dns
285networks: files
286
287protocols: files
288services: files
289ethers: files
290rpc: files
291
292# End /etc/nsswitch.conf</literal>
293EOF</userinput></screen>
294
295 </sect3>
296
297 <sect3>
298 <title>Adding time zone data</title>
299
300 <para>Install and set up the time zone data with the following:</para>
301<screen><userinput>tar -xf ../../tzdata&tzdata-version;.tar.gz
302
303ZONEINFO=/usr/share/zoneinfo
304mkdir -pv $ZONEINFO/{posix,right}
305
306for tz in etcetera southamerica northamerica europe africa antarctica \
307 asia australasia backward pacificnew systemv; do
308 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
309 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
310 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
311done
312
313cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
314zic -d $ZONEINFO -p America/New_York
315unset ZONEINFO</userinput></screen>
316
317 <variablelist>
318 <title>The meaning of the zic commands:</title>
319
320 <varlistentry>
321 <term><parameter>zic -L /dev/null ...</parameter></term>
322 <listitem>
323 <para>This creates posix time zones, without any leap seconds. It is
324 conventional to put these in both
325 <filename class="directory">zoneinfo</filename> and
326 <filename class="directory">zoneinfo/posix</filename>. It is
327 necessary to put the POSIX time zones in
328 <filename class="directory">zoneinfo</filename>, otherwise various
329 test-suites will report errors. On an embedded system, where space is
330 tight and you do not intend to ever update the time zones, you could save
331 1.9MB by not using the <filename class="directory">posix</filename>
332 directory, but some applications or test-suites might produce some
333 failures.</para>
334 </listitem>
335 </varlistentry>
336 <varlistentry>
337 <term><parameter>zic -L leapseconds ...</parameter></term>
338 <listitem>
339 <para>This creates right time zones, including leap seconds. On an
340 embedded system, where space is tight and you do not intend to
341 ever update the time zones, or care about the correct time, you could
342 save 1.9MB by omitting the <filename class="directory">right</filename>
343 directory.</para>
344 </listitem>
345 </varlistentry>
346 <varlistentry>
347 <term><parameter>zic ... -p ...</parameter></term>
348 <listitem>
349 <para>This creates the <filename>posixrules</filename> file. We use
350 New York because POSIX requires the daylight savings time rules
351 to be in accordance with US rules.</para>
352 </listitem>
353 </varlistentry>
354 </variablelist>
355
356
357 <para>One way to determine the local time zone is to run the following
358 script:</para>
359
360<screen role="nodump"><userinput>tzselect</userinput></screen>
361
362 <para>After answering a few questions about the location, the script will
363 output the name of the time zone (e.g.,
364 <emphasis>America/Edmonton</emphasis>). There are also some other possible
365 time zones listed in <filename
366 class='directory'>/usr/share/zoneinfo</filename> such as
367 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
368 are not identified by the script but can be used.</para>
369
370 <para>Then create the <filename>/etc/localtime</filename> file by
371 running:</para>
372
373<screen revision="sysv"><userinput>cp -v /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
374
375<screen revision="systemd"><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
376
377 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
378 time zone selected (e.g., Canada/Eastern).</para>
379
380 </sect3>
381
382 <sect3 id="conf-ld" role="configuration">
383 <title>Configuring the Dynamic Loader</title>
384
385 <indexterm zone="conf-ld">
386 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
387 </indexterm>
388
389 <para>By default, the dynamic loader (<filename
390 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
391 <filename class="directory">/lib</filename> and <filename
392 class="directory">/usr/lib</filename> for dynamic libraries that are
393 needed by programs as they are run. However, if there are libraries in
394 directories other than <filename class="directory">/lib</filename> and
395 <filename class="directory">/usr/lib</filename>, these need to be added
396 to the <filename>/etc/ld.so.conf</filename> file in order for the
397 dynamic loader to find them. Two directories that are commonly known
398 to contain additional libraries are <filename
399 class="directory">/usr/local/lib</filename> and <filename
400 class="directory">/opt/lib</filename>, so add those directories to the
401 dynamic loader's search path.</para>
402
403 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
404 following:</para>
405
406<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
407<literal># Begin /etc/ld.so.conf
408/usr/local/lib
409/opt/lib
410</literal>
411EOF</userinput></screen>
412
413 <para>If desired, the dynamic loader can also search a directory and
414 include the contents of files found there. Generally the files in
415 this include directory are one line specifying the desired library path.
416 To add this capability run the following commands:</para>
417
418<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
419<literal># Add an include directory
420include /etc/ld.so.conf.d/*.conf
421</literal>
422EOF
423mkdir -pv /etc/ld.so.conf.d</userinput></screen>
424
425 </sect3>
426 </sect2>
427
428 <sect2 id="contents-glibc" role="content">
429 <title>Contents of Glibc</title>
430
431 <segmentedlist>
432 <segtitle>Installed programs</segtitle>
433 <segtitle>Installed libraries</segtitle>
434 <segtitle>Installed directories</segtitle>
435
436 <seglistitem>
437 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
438 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd,
439 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
440 zdump, and zic</seg>
441 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
442 libc.{a,so}, libc_nonshared.a, libcidn.so,
443 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
444 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
445 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
446 libnss_nisplus.so, libpthread.{a,so},
447 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
448 libthread_db.so, and libutil.{a,so}</seg>
449 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
450 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
451 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
452 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
453 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
454 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
455 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
456 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
457 /var/cache/nscd, and /var/lib/nss_db</seg>
458 </seglistitem>
459 </segmentedlist>
460
461 <variablelist>
462 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
463 <?dbfo list-presentation="list"?>
464 <?dbhtml list-presentation="table"?>
465
466 <varlistentry id="catchsegv">
467 <term><command>catchsegv</command></term>
468 <listitem>
469 <para>Can be used to create a stack trace when a program
470 terminates with a segmentation fault</para>
471 <indexterm zone="ch-system-glibc catchsegv">
472 <primary sortas="b-catchsegv">catchsegv</primary>
473 </indexterm>
474 </listitem>
475 </varlistentry>
476
477 <varlistentry id="gencat">
478 <term><command>gencat</command></term>
479 <listitem>
480 <para>Generates message catalogues</para>
481 <indexterm zone="ch-system-glibc gencat">
482 <primary sortas="b-gencat">gencat</primary>
483 </indexterm>
484 </listitem>
485 </varlistentry>
486
487 <varlistentry id="getconf">
488 <term><command>getconf</command></term>
489 <listitem>
490 <para>Displays the system configuration values for file system
491 specific variables</para>
492 <indexterm zone="ch-system-glibc getconf">
493 <primary sortas="b-getconf">getconf</primary>
494 </indexterm>
495 </listitem>
496 </varlistentry>
497
498 <varlistentry id="getent">
499 <term><command>getent</command></term>
500 <listitem>
501 <para>Gets entries from an administrative database</para>
502 <indexterm zone="ch-system-glibc getent">
503 <primary sortas="b-getent">getent</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="iconv">
509 <term><command>iconv</command></term>
510 <listitem>
511 <para>Performs character set conversion</para>
512 <indexterm zone="ch-system-glibc iconv">
513 <primary sortas="b-iconv">iconv</primary>
514 </indexterm>
515 </listitem>
516 </varlistentry>
517
518 <varlistentry id="iconvconfig">
519 <term><command>iconvconfig</command></term>
520 <listitem>
521 <para>Creates fastloading <command>iconv</command> module configuration
522 files</para>
523 <indexterm zone="ch-system-glibc iconvconfig">
524 <primary sortas="b-iconvconfig">iconvconfig</primary>
525 </indexterm>
526 </listitem>
527 </varlistentry>
528
529 <varlistentry id="ldconfig">
530 <term><command>ldconfig</command></term>
531 <listitem>
532 <para>Configures the dynamic linker runtime bindings</para>
533 <indexterm zone="ch-system-glibc ldconfig">
534 <primary sortas="b-ldconfig">ldconfig</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="ldd">
540 <term><command>ldd</command></term>
541 <listitem>
542 <para>Reports which shared libraries are required
543 by each given program or shared library</para>
544 <indexterm zone="ch-system-glibc ldd">
545 <primary sortas="b-ldd">ldd</primary>
546 </indexterm>
547 </listitem>
548 </varlistentry>
549
550 <varlistentry id="lddlibc4">
551 <term><command>lddlibc4</command></term>
552 <listitem>
553 <para>Assists <command>ldd</command> with object files</para>
554 <indexterm zone="ch-system-glibc lddlibc4">
555 <primary sortas="b-lddlibc4">lddlibc4</primary>
556 </indexterm>
557 </listitem>
558 </varlistentry>
559
560 <varlistentry id="locale">
561 <term><command>locale</command></term>
562 <listitem>
563 <para>Prints various information about the current locale</para>
564 <indexterm zone="ch-system-glibc locale">
565 <primary sortas="b-locale">locale</primary>
566 </indexterm>
567 </listitem>
568 </varlistentry>
569
570 <varlistentry id="localedef">
571 <term><command>localedef</command></term>
572 <listitem>
573 <para>Compiles locale specifications</para>
574 <indexterm zone="ch-system-glibc localedef">
575 <primary sortas="b-localedef">localedef</primary>
576 </indexterm>
577 </listitem>
578 </varlistentry>
579
580 <varlistentry id="makedb">
581 <term><command>makedb</command></term>
582 <listitem>
583 <para>Creates a simple database from textual input</para>
584 <indexterm zone="ch-system-glibc makedb">
585 <primary sortas="b-makedb">makedb</primary>
586 </indexterm>
587 </listitem>
588 </varlistentry>
589
590 <varlistentry id="mtrace">
591 <term><command>mtrace</command></term>
592 <listitem>
593 <para>Reads and interprets a memory trace file and displays a summary
594 in human-readable format</para>
595 <indexterm zone="ch-system-glibc mtrace">
596 <primary sortas="b-mtrace">mtrace</primary>
597 </indexterm>
598 </listitem>
599 </varlistentry>
600
601 <varlistentry id="nscd">
602 <term><command>nscd</command></term>
603 <listitem>
604 <para>A daemon that provides a cache for the most common name
605 service requests</para>
606 <indexterm zone="ch-system-glibc nscd">
607 <primary sortas="b-nscd">nscd</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611
612 <varlistentry id="pldd">
613 <term><command>pldd</command></term>
614 <listitem>
615 <para>Lists dynamic shared objects used by running processes</para>
616 <indexterm zone="ch-system-glibc pldd">
617 <primary sortas="b-pldd">pldd</primary>
618 </indexterm>
619 </listitem>
620 </varlistentry>
621
622 <varlistentry id="rpcgen">
623 <term><command>rpcgen</command></term>
624 <listitem>
625 <para>Generates C code to implement the Remote Procedure Call (RPC)
626 protocol</para>
627 <indexterm zone="ch-system-glibc rpcgen">
628 <primary sortas="b-rpcgen">rpcgen</primary>
629 </indexterm>
630 </listitem>
631 </varlistentry>
632
633 <varlistentry id="sln">
634 <term><command>sln</command></term>
635 <listitem>
636 <para>A statically linked <command>ln</command> program</para>
637 <indexterm zone="ch-system-glibc sln">
638 <primary sortas="b-sln">sln</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 <varlistentry id="sotruss">
644 <term><command>sotruss</command></term>
645 <listitem>
646 <para>Traces shared library procedure calls of a specified command</para>
647 <indexterm zone="ch-system-glibc sotruss">
648 <primary sortas="b-sotruss">sotruss</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="sprof">
654 <term><command>sprof</command></term>
655 <listitem>
656 <para>Reads and displays shared object profiling data</para>
657 <indexterm zone="ch-system-glibc sprof">
658 <primary sortas="b-sprof">sprof</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="tzselect">
664 <term><command>tzselect</command></term>
665 <listitem>
666 <para>Asks the user about the location of the system and reports
667 the corresponding time zone description</para>
668 <indexterm zone="ch-system-glibc tzselect">
669 <primary sortas="b-tzselect">tzselect</primary>
670 </indexterm>
671 </listitem>
672 </varlistentry>
673
674 <varlistentry id="xtrace">
675 <term><command>xtrace</command></term>
676 <listitem>
677 <para>Traces the execution of a program by printing the currently
678 executed function</para>
679 <indexterm zone="ch-system-glibc xtrace">
680 <primary sortas="b-xtrace">xtrace</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="zdump">
686 <term><command>zdump</command></term>
687 <listitem>
688 <para>The time zone dumper</para>
689 <indexterm zone="ch-system-glibc zdump">
690 <primary sortas="b-zdump">zdump</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="zic">
696 <term><command>zic</command></term>
697 <listitem>
698 <para>The time zone compiler</para>
699 <indexterm zone="ch-system-glibc zic">
700 <primary sortas="b-zic">zic</primary>
701 </indexterm>
702 </listitem>
703 </varlistentry>
704
705 <varlistentry id="ld.so">
706 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
707 <listitem>
708 <para>The helper program for shared library executables</para>
709 <indexterm zone="ch-system-glibc ld.so">
710 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
711 </indexterm>
712 </listitem>
713 </varlistentry>
714
715 <varlistentry id="libBrokenLocale">
716 <term><filename class="libraryfile">libBrokenLocale</filename></term>
717 <listitem>
718 <para>Used internally by Glibc as a gross hack to get broken programs
719 (e.g., some Motif applications) running. See comments in
720 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
721 for more information</para>
722 <indexterm zone="ch-system-glibc libBrokenLocale">
723 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
724 </indexterm>
725 </listitem>
726 </varlistentry>
727
728 <varlistentry id="libSegFault">
729 <term><filename class="libraryfile">libSegFault</filename></term>
730 <listitem>
731 <para>The segmentation fault signal handler, used by
732 <command>catchsegv</command></para>
733 <indexterm zone="ch-system-glibc libSegFault">
734 <primary sortas="c-libSegFault">libSegFault</primary>
735 </indexterm>
736 </listitem>
737 </varlistentry>
738
739 <varlistentry id="libanl">
740 <term><filename class="libraryfile">libanl</filename></term>
741 <listitem>
742 <para>An asynchronous name lookup library</para>
743 <indexterm zone="ch-system-glibc libanl">
744 <primary sortas="c-libanl">libanl</primary>
745 </indexterm>
746 </listitem>
747 </varlistentry>
748
749 <varlistentry id="libc">
750 <term><filename class="libraryfile">libc</filename></term>
751 <listitem>
752 <para>The main C library</para>
753 <indexterm zone="ch-system-glibc libc">
754 <primary sortas="c-libc">libc</primary>
755 </indexterm>
756 </listitem>
757 </varlistentry>
758
759 <varlistentry id="libcidn">
760 <term><filename class="libraryfile">libcidn</filename></term>
761 <listitem>
762 <para>Used internally by Glibc for handling internationalized domain
763 names in the <function>getaddrinfo()</function> function</para>
764 <indexterm zone="ch-system-glibc libcidn">
765 <primary sortas="c-libcidn">libcidn</primary>
766 </indexterm>
767 </listitem>
768 </varlistentry>
769
770 <varlistentry id="libcrypt">
771 <term><filename class="libraryfile">libcrypt</filename></term>
772 <listitem>
773 <para>The cryptography library</para>
774 <indexterm zone="ch-system-glibc libcrypt">
775 <primary sortas="c-libcrypt">libcrypt</primary>
776 </indexterm>
777 </listitem>
778 </varlistentry>
779
780 <varlistentry id="libdl">
781 <term><filename class="libraryfile">libdl</filename></term>
782 <listitem>
783 <para>The dynamic linking interface library</para>
784 <indexterm zone="ch-system-glibc libdl">
785 <primary sortas="c-libdl">libdl</primary>
786 </indexterm>
787 </listitem>
788 </varlistentry>
789
790 <varlistentry id="libg">
791 <term><filename class="libraryfile">libg</filename></term>
792 <listitem>
793 <para>Dummy library containing no functions. Previously was a runtime
794 library for <command>g++</command></para>
795 <indexterm zone="ch-system-glibc libg">
796 <primary sortas="c-libg">libg</primary>
797 </indexterm>
798 </listitem>
799 </varlistentry>
800
801 <varlistentry id="libieee">
802 <term><filename class="libraryfile">libieee</filename></term>
803 <listitem>
804 <para>Linking in this module forces error handling rules for math
805 functions as defined by the Institute of Electrical and Electronic
806 Engineers (IEEE). The default is POSIX.1 error handling</para>
807 <indexterm zone="ch-system-glibc libieee">
808 <primary sortas="c-libieee">libieee</primary>
809 </indexterm>
810 </listitem>
811 </varlistentry>
812
813 <varlistentry id="libm">
814 <term><filename class="libraryfile">libm</filename></term>
815 <listitem>
816 <para>The mathematical library</para>
817 <indexterm zone="ch-system-glibc libm">
818 <primary sortas="c-libm">libm</primary>
819 </indexterm>
820 </listitem>
821 </varlistentry>
822
823 <varlistentry id="libmcheck">
824 <term><filename class="libraryfile">libmcheck</filename></term>
825 <listitem>
826 <para>Turns on memory allocation checking when linked to</para>
827 <indexterm zone="ch-system-glibc libmcheck">
828 <primary sortas="c-libmcheck">libmcheck</primary>
829 </indexterm>
830 </listitem>
831 </varlistentry>
832
833 <varlistentry id="libmemusage">
834 <term><filename class="libraryfile">libmemusage</filename></term>
835 <listitem>
836 <para>Used by <command>memusage</command> to help collect
837 information about the memory usage of a program</para>
838 <indexterm zone="ch-system-glibc libmemusage">
839 <primary sortas="c-libmemusage">libmemusage</primary>
840 </indexterm>
841 </listitem>
842 </varlistentry>
843
844 <varlistentry id="libnsl">
845 <term><filename class="libraryfile">libnsl</filename></term>
846 <listitem>
847 <para>The network services library</para>
848 <indexterm zone="ch-system-glibc libnsl">
849 <primary sortas="c-libnsl">libnsl</primary>
850 </indexterm>
851 </listitem>
852 </varlistentry>
853
854 <varlistentry id="libnss">
855 <term><filename class="libraryfile">libnss</filename></term>
856 <listitem>
857 <para>The Name Service Switch libraries, containing functions for
858 resolving host names, user names, group names, aliases, services,
859 protocols, etc.</para>
860 <indexterm zone="ch-system-glibc libnss">
861 <primary sortas="c-libnss">libnss</primary>
862 </indexterm>
863 </listitem>
864 </varlistentry>
865
866 <varlistentry id="libpthread">
867 <term><filename class="libraryfile">libpthread</filename></term>
868 <listitem>
869 <para>The POSIX threads library</para>
870 <indexterm zone="ch-system-glibc libpthread">
871 <primary sortas="c-libpthread">libpthread</primary>
872 </indexterm>
873 </listitem>
874 </varlistentry>
875
876 <varlistentry id="libresolv">
877 <term><filename class="libraryfile">libresolv</filename></term>
878 <listitem>
879 <para>Contains functions for creating, sending, and interpreting
880 packets to the Internet domain name servers</para>
881 <indexterm zone="ch-system-glibc libresolv">
882 <primary sortas="c-libresolv">libresolv</primary>
883 </indexterm>
884 </listitem>
885 </varlistentry>
886
887 <varlistentry id="librpcsvc">
888 <term><filename class="libraryfile">librpcsvc</filename></term>
889 <listitem>
890 <para>Contains functions providing miscellaneous RPC services</para>
891 <indexterm zone="ch-system-glibc librpcsvc">
892 <primary sortas="c-librpcsvc">librpcsvc</primary>
893 </indexterm>
894 </listitem>
895 </varlistentry>
896
897 <varlistentry id="librt">
898 <term><filename class="libraryfile">librt</filename></term>
899 <listitem>
900 <para>Contains functions providing most of the interfaces specified
901 by the POSIX.1b Realtime Extension</para>
902 <indexterm zone="ch-system-glibc librt">
903 <primary sortas="c-librt">librt</primary>
904 </indexterm>
905 </listitem>
906 </varlistentry>
907
908 <varlistentry id="libthread_db">
909 <term><filename class="libraryfile">libthread_db</filename></term>
910 <listitem>
911 <para>Contains functions useful for building debuggers for
912 multi-threaded programs</para>
913 <indexterm zone="ch-system-glibc libthread_db">
914 <primary sortas="c-libthread_db">libthread_db</primary>
915 </indexterm>
916 </listitem>
917 </varlistentry>
918
919 <varlistentry id="libutil">
920 <term><filename class="libraryfile">libutil</filename></term>
921 <listitem>
922 <para>Contains code for <quote>standard</quote> functions used in
923 many different Unix utilities</para>
924 <indexterm zone="ch-system-glibc libutil">
925 <primary sortas="c-libutil">libutil</primary>
926 </indexterm>
927 </listitem>
928 </varlistentry>
929
930 </variablelist>
931
932 </sect2>
933
934</sect1>
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