source: chapter06/glibc.xml@ 9da9f24f

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Last change on this file since 9da9f24f was 9da9f24f, checked in by Matthew Burgess <matthew@…>, 15 years ago

Re-introduce the Glibc-libidn package as it is not included in the Glibc release tarball.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8848 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
  • Property mode set to 100644
File size: 33.0 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>
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>The Glibc build system is self-contained and will install
58 perfectly, even though the compiler specs file and linker are still
59 pointing at <filename class="directory">/tools</filename>. The specs
60 and linker cannot be adjusted before the Glibc install because the
61 Glibc autoconf tests would give false results and defeat the goal
62 of achieving a clean build.</para>
63
64 <para>The glibc-libidn tarball adds support for internationalized domain
65 names (IDN) to Glibc. Many programs that support IDN require the full
66 <filename class="libraryfile">libidn</filename> library, not this add-on (see
67 <ulink url="&blfs-root;view/svn/general/libidn.html"/>).
68 Unpack the tarball from within the Glibc source directory:</para>
69
70<screen><userinput remap="pre">tar -xvf ../glibc-libidn-&glibc-version;.tar.bz2
71mv glibc-libidn-&glibc-version; libidn</userinput></screen>
72
73 <para>In the vi_VN.TCVN locale, <command>bash</command> enters an infinite
74 loop at startup. It is unknown whether this is a <command>bash</command>
75 bug or a Glibc problem. Disable installation of this locale in order to
76 avoid the problem:</para>
77
78<screen><userinput remap="pre">sed -i '/vi_VN.TCVN/d' localedata/SUPPORTED</userinput></screen>
79
80 <para>When running <command>make install</command>, a script called
81 <filename>test-installation.pl</filename> performs a small sanity test on
82 our newly installed Glibc. However, because our toolchain still points to
83 the <filename class="directory">/tools</filename> directory, the sanity
84 test would be carried out against the wrong Glibc. We can force the script
85 to check the Glibc we have just installed with the following:</para>
86
87<screen><userinput remap="pre">DL=$(readelf -l /bin/sh | grep interpreter | \
88awk '{print $4}' | sed -e 's@/tools@@' -e 's@]$@@')
89sed -i &quot;s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=$DL -o|&quot; \
90 scripts/test-installation.pl
91unset DL</userinput></screen>
92
93 <para>First apply a patch which corrects a failure in the test suite:</para>
94
95<screen><userinput remap="pre">patch -Np1 -i ../&glibc-ildoubl-test-fix-patch;</userinput></screen>
96
97
98 <para>The <command>ldd</command> shell script contains Bash-specific
99 syntax. Change its default program interpreter to <command>/bin/bash</command>
100 in case another <command>/bin/sh</command> is installed as described in the
101 <ulink url="&blfs-root;view/svn/postlfs/shells.html">Shells</ulink>
102 chapter of the BLFS book:</para>
103
104<screen><userinput remap="pre">sed -i 's|@BASH@|/bin/bash|' elf/ldd.bash.in</userinput></screen>
105
106 <para>The Glibc documentation recommends building Glibc outside of the source
107 directory in a dedicated build directory:</para>
108
109<screen><userinput remap="pre">mkdir -v ../glibc-build
110cd ../glibc-build</userinput></screen>
111
112 <para>Again, add the needed compiler flags to CFLAGS for x86 machines:</para>
113
114<screen><userinput remap="configure">case `uname -m` in
115 i?86) echo "CFLAGS += -march=i486 -mtune=native" &gt; configparms ;;
116esac</userinput></screen>
117
118 <para>Prepare Glibc for compilation:</para>
119
120<screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/usr \
121 --disable-profile --enable-add-ons \
122 --enable-kernel=2.6.0 --libexecdir=/usr/lib/glibc</userinput></screen>
123
124 <variablelist>
125 <title>The meaning of the new configure options:</title>
126
127 <varlistentry>
128 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
129 <listitem>
130 <para>This changes the location of the <command>pt_chown</command>
131 program from its default of <filename
132 class="directory">/usr/libexec</filename> to <filename
133 class="directory">/usr/lib/glibc</filename>.</para>
134 </listitem>
135 </varlistentry>
136
137 </variablelist>
138
139 <para>Compile the package:</para>
140
141<screen><userinput remap="make">make</userinput></screen>
142
143 <important>
144 <para>In this section, the test suite for Glibc is considered critical.
145 Do not skip it under any circumstance.</para>
146 </important>
147
148 <para>Before running the tests, copy a file from the source tree into our
149 build tree to prevent a couple of test failures, then test the
150 results:</para>
151
152<screen><userinput remap="test">cp -v ../glibc-&glibc-version;/iconvdata/gconv-modules iconvdata
153make -k check 2&gt;&amp;1 | tee glibc-check-log
154grep Error glibc-check-log</userinput></screen>
155
156 <para>You will probably see an expected (ignored) failure in the
157 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
158 is somewhat dependent on the host system. This is a list of the most
159 common issues:</para>
160
161 <itemizedlist>
162 <!-- Check again after updating from gcc-4.1.x -->
163 <listitem>
164 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
165 using the 4.1 series of GCC.</para>
166 </listitem>
167 <!-- Was true in glibc-2.3.6 -->
168 <listitem>
169 <para>The <emphasis>nptl/tst-clock2</emphasis> and
170 <emphasis>tst-attr3</emphasis> tests sometimes
171 fail. The reason is not completely understood, but indications
172 are that a heavy system load can trigger these failures.</para>
173 </listitem>
174 <listitem>
175 <para>The math tests sometimes fail when running on
176 systems where the CPU is not a relatively new genuine Intel or
177 authentic AMD processor.</para>
178 </listitem>
179 <listitem>
180 <para>If you have mounted the LFS partition with the
181 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
182 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
183 use the <parameter>noatime</parameter> option while building LFS.</para>
184 </listitem>
185 <listitem>
186 <para>When running on older and slower hardware or on systems under
187 load, some tests can fail because of test timeouts being exceeded.</para>
188 </listitem>
189 </itemizedlist>
190
191 <para>Though it is a harmless message, the install stage of Glibc will
192 complain about the absence of <filename>/etc/ld.so.conf</filename>.
193 Prevent this warning with:</para>
194
195<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
196
197 <para>Install the package:</para>
198
199<screen><userinput remap="install">make install</userinput></screen>
200
201 <para>The locales that can make the system respond in a different language
202 were not installed by the above command. None of the locales are required,
203 but if some of them are missing, testsuites of the future packages would
204 skip important testcases.</para>
205
206 <para>Individual locales can be installed using the
207 <command>localedef</command> program. E.g., the first
208 <command>localedef</command> command below combines the
209 <filename>/usr/share/i18n/locales/cs_CZ</filename>
210 charset-independent locale definition with the
211 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
212 charmap definition and appends the result to the
213 <filename>/usr/lib/locale/locale-archive</filename> file.
214 The following instructions will install the minimum set of
215 locales necessary for the optimal coverage of tests:</para>
216
217<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
218localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
219localedef -i de_DE -f ISO-8859-1 de_DE
220localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
221localedef -i de_DE -f UTF-8 de_DE.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 ja_JP -f EUC-JP ja_JP
233localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
234localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
235
236 <para>In addition, install the locale for your own country, language and
237 character set.</para>
238
239 <para>Alternatively, install all locales listed in the
240 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
241 (it includes every locale listed above and many more) at once with the
242 following time-consuming command:</para>
243
244<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
245
246 <para>Then use the <command>localedef</command> command to create and
247 install locales not listed in the
248 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
249 in the unlikely case you need them.</para>
250 <!-- The Live CD patches the localedata/SUPPORTED file instead of
251 running localedef, the results are equivalent -->
252
253 </sect2>
254
255 <sect2 id="conf-glibc" role="configuration">
256 <title>Configuring Glibc</title>
257
258 <indexterm zone="conf-glibc">
259 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
260 </indexterm>
261
262 <indexterm zone="conf-glibc">
263 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
264 </indexterm>
265
266 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
267 because, although Glibc provides defaults when this file is missing or corrupt,
268 the Glibc defaults do not work well in a networked environment. The time zone
269 also needs to be configured.</para>
270
271 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
272 following:</para>
273
274<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
275<literal># Begin /etc/nsswitch.conf
276
277passwd: files
278group: files
279shadow: files
280
281hosts: files dns
282networks: files
283
284protocols: files
285services: files
286ethers: files
287rpc: files
288
289# End /etc/nsswitch.conf</literal>
290EOF</userinput></screen>
291
292 <para>One way to determine the local time zone, run the following
293 script:</para>
294
295<screen role="nodump"><userinput>tzselect</userinput></screen>
296
297 <para>After answering a few questions about the location, the script will
298 output the name of the time zone (e.g.,
299 <emphasis>America/Edmonton</emphasis>). There are also some other possible
300 timezones listed in <filename
301 class='directory'>/usr/share/zoneinfo</filename> such as
302 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
303 are not identified by the script but can be used.</para>
304
305 <para>Then create the <filename>/etc/localtime</filename> file by
306 running:</para>
307
308<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
309 /etc/localtime</userinput></screen>
310
311 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
312 time zone selected (e.g., Canada/Eastern).</para>
313
314 <variablelist>
315 <title>The meaning of the cp option:</title>
316
317 <varlistentry>
318 <term><parameter>--remove-destination</parameter></term>
319 <listitem>
320 <para>This is needed to force removal of the already existing symbolic
321 link. The reason for copying the file instead of using a symlink is to
322 cover the situation where <filename class="directory">/usr</filename>
323 is on a separate partition. This could be important when booted into
324 single user mode.</para>
325 </listitem>
326 </varlistentry>
327
328 </variablelist>
329
330 </sect2>
331
332 <sect2 id="conf-ld" role="configuration">
333 <title>Configuring the Dynamic Loader</title>
334
335 <indexterm zone="conf-ld">
336 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
337 </indexterm>
338
339 <para>By default, the dynamic loader (<filename
340 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
341 <filename class="directory">/lib</filename> and <filename
342 class="directory">/usr/lib</filename> for dynamic libraries that are
343 needed by programs as they are run. However, if there are libraries in
344 directories other than <filename class="directory">/lib</filename> and
345 <filename class="directory">/usr/lib</filename>, these need to be added
346 to the <filename>/etc/ld.so.conf</filename> file in order for the
347 dynamic loader to find them. Two directories that are commonly known
348 to contain additional libraries are <filename
349 class="directory">/usr/local/lib</filename> and <filename
350 class="directory">/opt/lib</filename>, so add those directories to the
351 dynamic loader's search path.</para>
352
353 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
354 following:</para>
355
356<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
357<literal># Begin /etc/ld.so.conf
358
359/usr/local/lib
360/opt/lib
361
362# End /etc/ld.so.conf</literal>
363EOF</userinput></screen>
364
365 </sect2>
366
367 <sect2 id="contents-glibc" role="content">
368 <title>Contents of Glibc</title>
369
370 <segmentedlist>
371 <segtitle>Installed programs</segtitle>
372 <segtitle>Installed libraries</segtitle>
373
374 <seglistitem>
375 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
376 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
377 pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
378 zdump, and zic</seg>
379 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
380 libbsd-compat.a, libc.{a,so}, libcidn.so, libcrypt.{a,so}, libdl.{a,so},
381 libg.a, libieee.a, libm.{a,so}, libmcheck.a, libmemusage.so,
382 libnsl.{a,so}, libnss_compat.so, libnss_dns.so, libnss_files.so,
383 libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so, libpcprofile.so,
384 libpthread.{a,so}, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
385 libthread_db.so, and libutil.{a,so}</seg>
386 </seglistitem>
387 </segmentedlist>
388
389 <variablelist>
390 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
391 <?dbfo list-presentation="list"?>
392 <?dbhtml list-presentation="table"?>
393
394 <varlistentry id="catchsegv">
395 <term><command>catchsegv</command></term>
396 <listitem>
397 <para>Can be used to create a stack trace when a program
398 terminates with a segmentation fault</para>
399 <indexterm zone="ch-system-glibc catchsegv">
400 <primary sortas="b-catchsegv">catchsegv</primary>
401 </indexterm>
402 </listitem>
403 </varlistentry>
404
405 <varlistentry id="gencat">
406 <term><command>gencat</command></term>
407 <listitem>
408 <para>Generates message catalogues</para>
409 <indexterm zone="ch-system-glibc gencat">
410 <primary sortas="b-gencat">gencat</primary>
411 </indexterm>
412 </listitem>
413 </varlistentry>
414
415 <varlistentry id="getconf">
416 <term><command>getconf</command></term>
417 <listitem>
418 <para>Displays the system configuration values for file system
419 specific variables</para>
420 <indexterm zone="ch-system-glibc getconf">
421 <primary sortas="b-getconf">getconf</primary>
422 </indexterm>
423 </listitem>
424 </varlistentry>
425
426 <varlistentry id="getent">
427 <term><command>getent</command></term>
428 <listitem>
429 <para>Gets entries from an administrative database</para>
430 <indexterm zone="ch-system-glibc getent">
431 <primary sortas="b-getent">getent</primary>
432 </indexterm>
433 </listitem>
434 </varlistentry>
435
436 <varlistentry id="iconv">
437 <term><command>iconv</command></term>
438 <listitem>
439 <para>Performs character set conversion</para>
440 <indexterm zone="ch-system-glibc iconv">
441 <primary sortas="b-iconv">iconv</primary>
442 </indexterm>
443 </listitem>
444 </varlistentry>
445
446 <varlistentry id="iconvconfig">
447 <term><command>iconvconfig</command></term>
448 <listitem>
449 <para>Creates fastloading <command>iconv</command> module configuration
450 files</para>
451 <indexterm zone="ch-system-glibc iconvconfig">
452 <primary sortas="b-iconvconfig">iconvconfig</primary>
453 </indexterm>
454 </listitem>
455 </varlistentry>
456
457 <varlistentry id="ldconfig">
458 <term><command>ldconfig</command></term>
459 <listitem>
460 <para>Configures the dynamic linker runtime bindings</para>
461 <indexterm zone="ch-system-glibc ldconfig">
462 <primary sortas="b-ldconfig">ldconfig</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="ldd">
468 <term><command>ldd</command></term>
469 <listitem>
470 <para>Reports which shared libraries are required
471 by each given program or shared library</para>
472 <indexterm zone="ch-system-glibc ldd">
473 <primary sortas="b-ldd">ldd</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="lddlibc4">
479 <term><command>lddlibc4</command></term>
480 <listitem>
481 <para>Assists <command>ldd</command> with object files</para>
482 <indexterm zone="ch-system-glibc lddlibc4">
483 <primary sortas="b-lddlibc4">lddlibc4</primary>
484 </indexterm>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry id="locale">
489 <term><command>locale</command></term>
490 <listitem>
491 <para>Prints various information about the current locale</para>
492 <indexterm zone="ch-system-glibc locale">
493 <primary sortas="b-locale">locale</primary>
494 </indexterm>
495 </listitem>
496 </varlistentry>
497
498 <varlistentry id="localedef">
499 <term><command>localedef</command></term>
500 <listitem>
501 <para>Compiles locale specifications</para>
502 <indexterm zone="ch-system-glibc localedef">
503 <primary sortas="b-localedef">localedef</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="mtrace">
509 <term><command>mtrace</command></term>
510 <listitem>
511 <para>Reads and interprets a memory trace file and displays a summary
512 in human-readable format</para>
513 <indexterm zone="ch-system-glibc mtrace">
514 <primary sortas="b-mtrace">mtrace</primary>
515 </indexterm>
516 </listitem>
517 </varlistentry>
518
519 <varlistentry id="nscd">
520 <term><command>nscd</command></term>
521 <listitem>
522 <para>A daemon that provides a cache for the most common name
523 service requests</para>
524 <indexterm zone="ch-system-glibc nscd">
525 <primary sortas="b-nscd">nscd</primary>
526 </indexterm>
527 </listitem>
528 </varlistentry>
529
530 <varlistentry id="pcprofiledump">
531 <term><command>pcprofiledump</command></term>
532 <listitem>
533 <para>Dumps information generated by PC profiling</para>
534 <indexterm zone="ch-system-glibc pcprofiledump">
535 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
536 </indexterm>
537 </listitem>
538 </varlistentry>
539
540 <varlistentry id="pt_chown">
541 <term><command>pt_chown</command></term>
542 <listitem>
543 <para>A helper program for <command>grantpt</command> to set the owner,
544 group and access permissions of a slave pseudo terminal</para>
545 <indexterm zone="ch-system-glibc pt_chown">
546 <primary sortas="b-pt_chown">pt_chown</primary>
547 </indexterm>
548 </listitem>
549 </varlistentry>
550
551 <varlistentry id="rpcgen">
552 <term><command>rpcgen</command></term>
553 <listitem>
554 <para>Generates C code to implement the Remote Procedure Call (RPC)
555 protocol</para>
556 <indexterm zone="ch-system-glibc rpcgen">
557 <primary sortas="b-rpcgen">rpcgen</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="rpcinfo">
563 <term><command>rpcinfo</command></term>
564 <listitem>
565 <para>Makes an RPC call to an RPC server</para>
566 <indexterm zone="ch-system-glibc rpcinfo">
567 <primary sortas="b-rpcinfo">rpcinfo</primary>
568 </indexterm>
569 </listitem>
570 </varlistentry>
571
572 <varlistentry id="sln">
573 <term><command>sln</command></term>
574 <listitem>
575 <para>A statically linked <command>ln</command> program</para>
576 <indexterm zone="ch-system-glibc sln">
577 <primary sortas="b-sln">sln</primary>
578 </indexterm>
579 </listitem>
580 </varlistentry>
581
582 <varlistentry id="sprof">
583 <term><command>sprof</command></term>
584 <listitem>
585 <para>Reads and displays shared object profiling data</para>
586 <indexterm zone="ch-system-glibc sprof">
587 <primary sortas="b-sprof">sprof</primary>
588 </indexterm>
589 </listitem>
590 </varlistentry>
591
592 <varlistentry id="tzselect">
593 <term><command>tzselect</command></term>
594 <listitem>
595 <para>Asks the user about the location of the system and reports
596 the corresponding time zone description</para>
597 <indexterm zone="ch-system-glibc tzselect">
598 <primary sortas="b-tzselect">tzselect</primary>
599 </indexterm>
600 </listitem>
601 </varlistentry>
602
603 <varlistentry id="xtrace">
604 <term><command>xtrace</command></term>
605 <listitem>
606 <para>Traces the execution of a program by printing the currently
607 executed function</para>
608 <indexterm zone="ch-system-glibc xtrace">
609 <primary sortas="b-xtrace">xtrace</primary>
610 </indexterm>
611 </listitem>
612 </varlistentry>
613
614 <varlistentry id="zdump">
615 <term><command>zdump</command></term>
616 <listitem>
617 <para>The time zone dumper</para>
618 <indexterm zone="ch-system-glibc zdump">
619 <primary sortas="b-zdump">zdump</primary>
620 </indexterm>
621 </listitem>
622 </varlistentry>
623
624 <varlistentry id="zic">
625 <term><command>zic</command></term>
626 <listitem>
627 <para>The time zone compiler</para>
628 <indexterm zone="ch-system-glibc zic">
629 <primary sortas="b-zic">zic</primary>
630 </indexterm>
631 </listitem>
632 </varlistentry>
633
634 <varlistentry id="ld.so">
635 <term><filename class="libraryfile">ld.so</filename></term>
636 <listitem>
637 <para>The helper program for shared library executables</para>
638 <indexterm zone="ch-system-glibc ld.so">
639 <primary sortas="c-ld.so">ld.so</primary>
640 </indexterm>
641 </listitem>
642 </varlistentry>
643
644 <varlistentry id="libBrokenLocale">
645 <term><filename class="libraryfile">libBrokenLocale</filename></term>
646 <listitem>
647 <para>Used internally by Glibc as a gross hack to get broken programs
648 (e.g., some Motif applications) running. See comments in
649 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
650 for more information</para>
651 <indexterm zone="ch-system-glibc libBrokenLocale">
652 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry>
656
657 <varlistentry id="libSegFault">
658 <term><filename class="libraryfile">libSegFault</filename></term>
659 <listitem>
660 <para>The segmentation fault signal handler, used by
661 <command>catchsegv</command></para>
662 <indexterm zone="ch-system-glibc libSegFault">
663 <primary sortas="c-libSegFault">libSegFault</primary>
664 </indexterm>
665 </listitem>
666 </varlistentry>
667
668 <varlistentry id="libanl">
669 <term><filename class="libraryfile">libanl</filename></term>
670 <listitem>
671 <para>An asynchronous name lookup library</para>
672 <indexterm zone="ch-system-glibc libanl">
673 <primary sortas="c-libanl">libanl</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="libbsd-compat">
679 <term><filename class="libraryfile">libbsd-compat</filename></term>
680 <listitem>
681 <para>Provides the portability needed in order to run certain
682 Berkeley Software Distribution (BSD) programs under Linux</para>
683 <indexterm zone="ch-system-glibc libbsd-compat">
684 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="libc">
690 <term><filename class="libraryfile">libc</filename></term>
691 <listitem>
692 <para>The main C library</para>
693 <indexterm zone="ch-system-glibc libc">
694 <primary sortas="c-libc">libc</primary>
695 </indexterm>
696 </listitem>
697 </varlistentry>
698
699 <varlistentry id="libcidn">
700 <term><filename class="libraryfile">libcidn</filename></term>
701 <listitem>
702 <para>Used internally by Glibc for handling internationalized domain
703 names in the <function>getaddrinfo()</function> function</para>
704 <indexterm zone="ch-system-glibc libcrypt">
705 <primary sortas="c-libcrypt">libcrypt</primary>
706 </indexterm>
707 </listitem>
708 </varlistentry>
709
710 <varlistentry id="libcrypt">
711 <term><filename class="libraryfile">libcrypt</filename></term>
712 <listitem>
713 <para>The cryptography library</para>
714 <indexterm zone="ch-system-glibc libcrypt">
715 <primary sortas="c-libcrypt">libcrypt</primary>
716 </indexterm>
717 </listitem>
718 </varlistentry>
719
720 <varlistentry id="libdl">
721 <term><filename class="libraryfile">libdl</filename></term>
722 <listitem>
723 <para>The dynamic linking interface library</para>
724 <indexterm zone="ch-system-glibc libdl">
725 <primary sortas="c-libdl">libdl</primary>
726 </indexterm>
727 </listitem>
728 </varlistentry>
729
730 <varlistentry id="libg">
731 <term><filename class="libraryfile">libg</filename></term>
732 <listitem>
733 <para>Dummy library containing no functions. Previously was a runtime
734 library for <command>g++</command></para>
735 <indexterm zone="ch-system-glibc libg">
736 <primary sortas="c-libg">libg</primary>
737 </indexterm>
738 </listitem>
739 </varlistentry>
740
741 <varlistentry id="libieee">
742 <term><filename class="libraryfile">libieee</filename></term>
743 <listitem>
744 <para>Linking in this module forces error handling rules for math
745 functions as defined by the Institute of Electrical and Electronic
746 Engineers (IEEE). The default is POSIX.1 error handling</para>
747 <indexterm zone="ch-system-glibc libieee">
748 <primary sortas="c-libieee">libieee</primary>
749 </indexterm>
750 </listitem>
751 </varlistentry>
752
753 <varlistentry id="libm">
754 <term><filename class="libraryfile">libm</filename></term>
755 <listitem>
756 <para>The mathematical library</para>
757 <indexterm zone="ch-system-glibc libm">
758 <primary sortas="c-libm">libm</primary>
759 </indexterm>
760 </listitem>
761 </varlistentry>
762
763 <varlistentry id="libmcheck">
764 <term><filename class="libraryfile">libmcheck</filename></term>
765 <listitem>
766 <para>Turns on memory allocation checking when linked to</para>
767 <indexterm zone="ch-system-glibc libmcheck">
768 <primary sortas="c-libmcheck">libmcheck</primary>
769 </indexterm>
770 </listitem>
771 </varlistentry>
772
773 <varlistentry id="libmemusage">
774 <term><filename class="libraryfile">libmemusage</filename></term>
775 <listitem>
776 <para>Used by <command>memusage</command> to help collect
777 information about the memory usage of a program</para>
778 <indexterm zone="ch-system-glibc libmemusage">
779 <primary sortas="c-libmemusage">libmemusage</primary>
780 </indexterm>
781 </listitem>
782 </varlistentry>
783
784 <varlistentry id="libnsl">
785 <term><filename class="libraryfile">libnsl</filename></term>
786 <listitem>
787 <para>The network services library</para>
788 <indexterm zone="ch-system-glibc libnsl">
789 <primary sortas="c-libnsl">libnsl</primary>
790 </indexterm>
791 </listitem>
792 </varlistentry>
793
794 <varlistentry id="libnss">
795 <term><filename class="libraryfile">libnss</filename></term>
796 <listitem>
797 <para>The Name Service Switch libraries, containing functions for
798 resolving host names, user names, group names, aliases, services,
799 protocols, etc.</para>
800 <indexterm zone="ch-system-glibc libnss">
801 <primary sortas="c-libnss">libnss</primary>
802 </indexterm>
803 </listitem>
804 </varlistentry>
805
806 <varlistentry id="libpcprofile">
807 <term><filename class="libraryfile">libpcprofile</filename></term>
808 <listitem>
809 <para>Contains profiling functions used to track the amount of CPU
810 time spent in specific source code lines</para>
811 <indexterm zone="ch-system-glibc libpcprofile">
812 <primary sortas="c-libpcprofile">libpcprofile</primary>
813 </indexterm>
814 </listitem>
815 </varlistentry>
816
817 <varlistentry id="libpthread">
818 <term><filename class="libraryfile">libpthread</filename></term>
819 <listitem>
820 <para>The POSIX threads library</para>
821 <indexterm zone="ch-system-glibc libpthread">
822 <primary sortas="c-libpthread">libpthread</primary>
823 </indexterm>
824 </listitem>
825 </varlistentry>
826
827 <varlistentry id="libresolv">
828 <term><filename class="libraryfile">libresolv</filename></term>
829 <listitem>
830 <para>Contains functions for creating, sending, and interpreting
831 packets to the Internet domain name servers</para>
832 <indexterm zone="ch-system-glibc libresolv">
833 <primary sortas="c-libresolv">libresolv</primary>
834 </indexterm>
835 </listitem>
836 </varlistentry>
837
838 <varlistentry id="librpcsvc">
839 <term><filename class="libraryfile">librpcsvc</filename></term>
840 <listitem>
841 <para>Contains functions providing miscellaneous RPC services</para>
842 <indexterm zone="ch-system-glibc librpcsvc">
843 <primary sortas="c-librpcsvc">librpcsvc</primary>
844 </indexterm>
845 </listitem>
846 </varlistentry>
847
848 <varlistentry id="librt">
849 <term><filename class="libraryfile">librt</filename></term>
850 <listitem>
851 <para>Contains functions providing most of the interfaces specified
852 by the POSIX.1b Realtime Extension</para>
853 <indexterm zone="ch-system-glibc librt">
854 <primary sortas="c-librt">librt</primary>
855 </indexterm>
856 </listitem>
857 </varlistentry>
858
859 <varlistentry id="libthread_db">
860 <term><filename class="libraryfile">libthread_db</filename></term>
861 <listitem>
862 <para>Contains functions useful for building debuggers for
863 multi-threaded programs</para>
864 <indexterm zone="ch-system-glibc libthread_db">
865 <primary sortas="c-libthread_db">libthread_db</primary>
866 </indexterm>
867 </listitem>
868 </varlistentry>
869
870 <varlistentry id="libutil">
871 <term><filename class="libraryfile">libutil</filename></term>
872 <listitem>
873 <para>Contains code for <quote>standard</quote> functions used in
874 many different Unix utilities</para>
875 <indexterm zone="ch-system-glibc libutil">
876 <primary sortas="c-libutil">libutil</primary>
877 </indexterm>
878 </listitem>
879 </varlistentry>
880
881 </variablelist>
882
883 </sect2>
884
885</sect1>
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