source: chapter06/glibc.xml@ c11bcb7

Last change on this file since c11bcb7 was c11bcb7, checked in by Manuel Canales Esparcia <manuel@…>, 17 years ago

Merged r8366 from trunk.

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/jh/BOOK@8367 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>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>tar -xvf ../glibc-libidn-&glibc-version;.tar.gz
71mv glibc-libidn-&glibc-version; libidn</userinput></screen>
72
73 <para>In the vi_VN.TCVN locale, <command>bash</command> enters an infinite loop
74 at startup. It is unknown whether this is a <command>bash</command> bug or a
75 Glibc problem. Disable installation of this locale in order to avoid the
76 problem:</para>
77
78<screen><userinput>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>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>The <command>ldd</command> shell script contains Bash-specific
94 syntax. Change it's default program interpreter to <command>/bin/bash</command>
95 in case another <command>/bin/sh</command> is installed as described in the
96 <ulink url="&blfs-root;view/svn/postlfs/shells.html">Shells</ulink>
97 chapter of the BLFS book:</para>
98
99<screen><userinput>sed -i 's|@BASH@|/bin/bash|' elf/ldd.bash.in</userinput></screen>
100
101 <para>The Glibc documentation recommends building Glibc outside of the source
102 directory in a dedicated build directory:</para>
103
104<screen><userinput>mkdir -v ../glibc-build
105cd ../glibc-build</userinput></screen>
106
107 <para>Prepare Glibc for compilation:</para>
108
109<screen><userinput>../glibc-&glibc-version;/configure --prefix=/usr \
110 --disable-profile --enable-add-ons \
111 --enable-kernel=2.6.0 --libexecdir=/usr/lib/glibc</userinput></screen>
112
113 <variablelist>
114 <title>The meaning of the new configure options:</title>
115
116 <varlistentry>
117 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
118 <listitem>
119 <para>This changes the location of the <command>pt_chown</command>
120 program from its default of <filename
121 class="directory">/usr/libexec</filename> to <filename
122 class="directory">/usr/lib/glibc</filename>.</para>
123 </listitem>
124 </varlistentry>
125
126 </variablelist>
127
128 <para>Compile the package:</para>
129
130<screen><userinput>make</userinput></screen>
131
132 <important>
133 <para>In this section, the test suite for Glibc is considered critical.
134 Do not skip it under any circumstance.</para>
135 </important>
136
137 <para>Test the results:</para>
138
139<screen><userinput>make -k check 2&gt;&amp;1 | tee glibc-check-log
140grep Error glibc-check-log</userinput></screen>
141
142 <para>You will probably see an expected (ignored) failure in the
143 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
144 is somewhat dependent on the host system. This is a list of the most
145 common issues:</para>
146
147 <itemizedlist>
148 <!-- Check again after updating from gcc-4.1.x -->
149 <listitem>
150 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
151 using the 4.1 series of GCC.</para>
152 </listitem>
153 <!-- Was true in glibc-2.3.6 -->
154 <listitem>
155 <para>The <emphasis>nptl/tst-clock2</emphasis> and
156 <emphasis>tst-attr3</emphasis> tests sometimes
157 fail. The reason is not completely understood, but indications
158 are that a heavy system load can trigger these failures.</para>
159 </listitem>
160 <listitem>
161 <para>The math tests sometimes fail when running on
162 systems where the CPU is not a relatively new genuine Intel or
163 authentic AMD processor.</para>
164 </listitem>
165 <listitem>
166 <para>If you have mounted the LFS partition with the
167 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
168 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
169 use the <parameter>noatime</parameter> option while building LFS.</para>
170 </listitem>
171 <listitem>
172 <para>When running on older and slower hardware or on systems under
173 load, some tests can fail because of test timeouts being exceeded.</para>
174 </listitem>
175 </itemizedlist>
176
177 <para>Though it is a harmless message, the install stage of Glibc will
178 complain about the absence of <filename>/etc/ld.so.conf</filename>.
179 Prevent this warning with:</para>
180
181<screen><userinput>touch /etc/ld.so.conf</userinput></screen>
182
183 <para>Install the package:</para>
184
185<screen><userinput>make install</userinput></screen>
186
187 <para>The locales that can make the system respond in a different language
188 were not installed by the above command. None of the locales are required,
189 but if some of them are missing, testsuites of the future packages would
190 skip important testcases.</para>
191
192 <para>Individual locales can be installed using the
193 <command>localedef</command> program. E.g., the first
194 <command>localedef</command> command below combines the
195 <filename>/usr/share/i18n/locales/de_DE</filename>
196 charset-independent locale definition with the
197 <filename>/usr/share/i18n/charmaps/ISO-8859-1.gz</filename>
198 charmap definition and appends the result to the
199 <filename>/usr/lib/locale/locale-archive</filename> file.
200 The following instructions will install the minimum set of
201 locales necessary for the optimal coverage of tests:</para>
202
203<screen role="nodump"><userinput>mkdir -pv /usr/lib/locale
204localedef -i de_DE -f ISO-8859-1 de_DE
205localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
206localedef -i en_HK -f ISO-8859-1 en_HK
207localedef -i en_PH -f ISO-8859-1 en_PH
208localedef -i en_US -f ISO-8859-1 en_US
209localedef -i en_US -f UTF-8 en_US.UTF-8
210localedef -i es_MX -f ISO-8859-1 es_MX
211localedef -i fa_IR -f UTF-8 fa_IR
212localedef -i fr_FR -f ISO-8859-1 fr_FR
213localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
214localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
215localedef -i it_IT -f ISO-8859-1 it_IT
216localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
217
218 <para>In addition, install the locale for your own country, language and
219 character set.</para>
220
221 <para>Alternatively, install all locales listed in the
222 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
223 (it includes every locale listed above and many more) at once with the
224 following time-consuming command:</para>
225
226<screen><userinput>make localedata/install-locales</userinput></screen>
227
228 <para>Then use the <command>localedef</command> command to create and
229 install locales not listed in the
230 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
231 in the unlikely case if you need them.</para>
232 <!-- The Live CD patches the localedata/SUPPORTED file instead of
233 running localedef, the results are equivalent -->
234
235 </sect2>
236
237 <sect2 id="conf-glibc" role="configuration">
238 <title>Configuring Glibc</title>
239
240 <indexterm zone="conf-glibc">
241 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
242 </indexterm>
243
244 <indexterm zone="conf-glibc">
245 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
246 </indexterm>
247
248 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
249 because, although Glibc provides defaults when this file is missing or corrupt,
250 the Glibc defaults do not work well in a networked environment. The time zone
251 also needs to be configured.</para>
252
253 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
254 following:</para>
255
256<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
257<literal># Begin /etc/nsswitch.conf
258
259passwd: files
260group: files
261shadow: files
262
263hosts: files dns
264networks: files
265
266protocols: files
267services: files
268ethers: files
269rpc: files
270
271# End /etc/nsswitch.conf</literal>
272EOF</userinput></screen>
273
274 <para>One way to determine the local time zone, run the following
275 script:</para>
276
277<screen role="nodump"><userinput>tzselect</userinput></screen>
278
279 <para>After answering a few questions about the location, the script will
280 output the name of the time zone (e.g.,
281 <emphasis>America/Edmonton</emphasis>). There are also some other possible
282 timezones listed in <filename
283 class='directory'>/usr/share/zoneinfo</filename> such as
284 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
285 are not identified by the script but can be used.</para>
286
287 <para>Then create the <filename>/etc/localtime</filename> file by
288 running:</para>
289
290<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
291 /etc/localtime</userinput></screen>
292
293 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
294 time zone selected (e.g., Canada/Eastern).</para>
295
296 <variablelist>
297 <title>The meaning of the cp option:</title>
298
299 <varlistentry>
300 <term><parameter>--remove-destination</parameter></term>
301 <listitem>
302 <para>This is needed to force removal of the already existing symbolic
303 link. The reason for copying the file instead of using a symlink is to
304 cover the situation where <filename class="directory">/usr</filename>
305 is on a separate partition. This could be important when booted into
306 single user mode.</para>
307 </listitem>
308 </varlistentry>
309
310 </variablelist>
311
312 </sect2>
313
314 <sect2 id="conf-ld" role="configuration">
315 <title>Configuring the Dynamic Loader</title>
316
317 <indexterm zone="conf-ld">
318 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
319 </indexterm>
320
321 <para>By default, the dynamic loader (<filename
322 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
323 <filename class="directory">/lib</filename> and <filename
324 class="directory">/usr/lib</filename> for dynamic libraries that are
325 needed by programs as they are run. However, if there are libraries in
326 directories other than <filename class="directory">/lib</filename> and
327 <filename class="directory">/usr/lib</filename>, these need to be added
328 to the <filename>/etc/ld.so.conf</filename> file in order for the
329 dynamic loader to find them. Two directories that are commonly known
330 to contain additional libraries are <filename
331 class="directory">/usr/local/lib</filename> and <filename
332 class="directory">/opt/lib</filename>, so add those directories to the
333 dynamic loader's search path.</para>
334
335 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
336 following:</para>
337
338<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
339<literal># Begin /etc/ld.so.conf
340
341/usr/local/lib
342/opt/lib
343
344# End /etc/ld.so.conf</literal>
345EOF</userinput></screen>
346
347 </sect2>
348
349 <sect2 id="contents-glibc" role="content">
350 <title>Contents of Glibc</title>
351
352 <segmentedlist>
353 <segtitle>Installed programs</segtitle>
354 <segtitle>Installed libraries</segtitle>
355
356 <seglistitem>
357 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
358 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
359 pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
360 zdump, and zic</seg>
361 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
362 libbsd-compat.a, libc.{a,so}, libcidn.so, libcrypt.{a,so}, libdl.{a,so},
363 libg.a, libieee.a, libm.{a,so}, libmcheck.a, libmemusage.so,
364 libnsl.{a,so}, libnss_compat.so, libnss_dns.so, libnss_files.so,
365 libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so, libpcprofile.so,
366 libpthread.{a,so}, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
367 libthread_db.so, and libutil.{a,so}</seg>
368 </seglistitem>
369 </segmentedlist>
370
371 <variablelist>
372 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
373 <?dbfo list-presentation="list"?>
374 <?dbhtml list-presentation="table"?>
375
376 <varlistentry id="catchsegv">
377 <term><command>catchsegv</command></term>
378 <listitem>
379 <para>Can be used to create a stack trace when a program
380 terminates with a segmentation fault</para>
381 <indexterm zone="ch-system-glibc catchsegv">
382 <primary sortas="b-catchsegv">catchsegv</primary>
383 </indexterm>
384 </listitem>
385 </varlistentry>
386
387 <varlistentry id="gencat">
388 <term><command>gencat</command></term>
389 <listitem>
390 <para>Generates message catalogues</para>
391 <indexterm zone="ch-system-glibc gencat">
392 <primary sortas="b-gencat">gencat</primary>
393 </indexterm>
394 </listitem>
395 </varlistentry>
396
397 <varlistentry id="getconf">
398 <term><command>getconf</command></term>
399 <listitem>
400 <para>Displays the system configuration values for file system
401 specific variables</para>
402 <indexterm zone="ch-system-glibc getconf">
403 <primary sortas="b-getconf">getconf</primary>
404 </indexterm>
405 </listitem>
406 </varlistentry>
407
408 <varlistentry id="getent">
409 <term><command>getent</command></term>
410 <listitem>
411 <para>Gets entries from an administrative database</para>
412 <indexterm zone="ch-system-glibc getent">
413 <primary sortas="b-getent">getent</primary>
414 </indexterm>
415 </listitem>
416 </varlistentry>
417
418 <varlistentry id="iconv">
419 <term><command>iconv</command></term>
420 <listitem>
421 <para>Performs character set conversion</para>
422 <indexterm zone="ch-system-glibc iconv">
423 <primary sortas="b-iconv">iconv</primary>
424 </indexterm>
425 </listitem>
426 </varlistentry>
427
428 <varlistentry id="iconvconfig">
429 <term><command>iconvconfig</command></term>
430 <listitem>
431 <para>Creates fastloading <command>iconv</command> module configuration
432 files</para>
433 <indexterm zone="ch-system-glibc iconvconfig">
434 <primary sortas="b-iconvconfig">iconvconfig</primary>
435 </indexterm>
436 </listitem>
437 </varlistentry>
438
439 <varlistentry id="ldconfig">
440 <term><command>ldconfig</command></term>
441 <listitem>
442 <para>Configures the dynamic linker runtime bindings</para>
443 <indexterm zone="ch-system-glibc ldconfig">
444 <primary sortas="b-ldconfig">ldconfig</primary>
445 </indexterm>
446 </listitem>
447 </varlistentry>
448
449 <varlistentry id="ldd">
450 <term><command>ldd</command></term>
451 <listitem>
452 <para>Reports which shared libraries are required
453 by each given program or shared library</para>
454 <indexterm zone="ch-system-glibc ldd">
455 <primary sortas="b-ldd">ldd</primary>
456 </indexterm>
457 </listitem>
458 </varlistentry>
459
460 <varlistentry id="lddlibc4">
461 <term><command>lddlibc4</command></term>
462 <listitem>
463 <para>Assists <command>ldd</command> with object files</para>
464 <indexterm zone="ch-system-glibc lddlibc4">
465 <primary sortas="b-lddlibc4">lddlibc4</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="locale">
471 <term><command>locale</command></term>
472 <listitem>
473 <para>Prints various information about the current locale</para>
474 <indexterm zone="ch-system-glibc locale">
475 <primary sortas="b-locale">locale</primary>
476 </indexterm>
477 </listitem>
478 </varlistentry>
479
480 <varlistentry id="localedef">
481 <term><command>localedef</command></term>
482 <listitem>
483 <para>Compiles locale specifications</para>
484 <indexterm zone="ch-system-glibc localedef">
485 <primary sortas="b-localedef">localedef</primary>
486 </indexterm>
487 </listitem>
488 </varlistentry>
489
490 <varlistentry id="mtrace">
491 <term><command>mtrace</command></term>
492 <listitem>
493 <para>Reads and interprets a memory trace file and displays a summary
494 in human-readable format</para>
495 <indexterm zone="ch-system-glibc mtrace">
496 <primary sortas="b-mtrace">mtrace</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="nscd">
502 <term><command>nscd</command></term>
503 <listitem>
504 <para>A daemon that provides a cache for the most common name
505 service requests</para>
506 <indexterm zone="ch-system-glibc nscd">
507 <primary sortas="b-nscd">nscd</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="pcprofiledump">
513 <term><command>pcprofiledump</command></term>
514 <listitem>
515 <para>Dumps information generated by PC profiling</para>
516 <indexterm zone="ch-system-glibc pcprofiledump">
517 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="pt_chown">
523 <term><command>pt_chown</command></term>
524 <listitem>
525 <para>A helper program for <command>grantpt</command> to set the owner,
526 group and access permissions of a slave pseudo terminal</para>
527 <indexterm zone="ch-system-glibc pt_chown">
528 <primary sortas="b-pt_chown">pt_chown</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="rpcgen">
534 <term><command>rpcgen</command></term>
535 <listitem>
536 <para>Generates C code to implement the Remote Procecure Call (RPC)
537 protocol</para>
538 <indexterm zone="ch-system-glibc rpcgen">
539 <primary sortas="b-rpcgen">rpcgen</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="rpcinfo">
545 <term><command>rpcinfo</command></term>
546 <listitem>
547 <para>Makes an RPC call to an RPC server</para>
548 <indexterm zone="ch-system-glibc rpcinfo">
549 <primary sortas="b-rpcinfo">rpcinfo</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="sln">
555 <term><command>sln</command></term>
556 <listitem>
557 <para>A statically linked <command>ln</command> program</para>
558 <indexterm zone="ch-system-glibc sln">
559 <primary sortas="b-sln">sln</primary>
560 </indexterm>
561 </listitem>
562 </varlistentry>
563
564 <varlistentry id="sprof">
565 <term><command>sprof</command></term>
566 <listitem>
567 <para>Reads and displays shared object profiling data</para>
568 <indexterm zone="ch-system-glibc sprof">
569 <primary sortas="b-sprof">sprof</primary>
570 </indexterm>
571 </listitem>
572 </varlistentry>
573
574 <varlistentry id="tzselect">
575 <term><command>tzselect</command></term>
576 <listitem>
577 <para>Asks the user about the location of the system and reports
578 the corresponding time zone description</para>
579 <indexterm zone="ch-system-glibc tzselect">
580 <primary sortas="b-tzselect">tzselect</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="xtrace">
586 <term><command>xtrace</command></term>
587 <listitem>
588 <para>Traces the execution of a program by printing the currently
589 executed function</para>
590 <indexterm zone="ch-system-glibc xtrace">
591 <primary sortas="b-xtrace">xtrace</primary>
592 </indexterm>
593 </listitem>
594 </varlistentry>
595
596 <varlistentry id="zdump">
597 <term><command>zdump</command></term>
598 <listitem>
599 <para>The time zone dumper</para>
600 <indexterm zone="ch-system-glibc zdump">
601 <primary sortas="b-zdump">zdump</primary>
602 </indexterm>
603 </listitem>
604 </varlistentry>
605
606 <varlistentry id="zic">
607 <term><command>zic</command></term>
608 <listitem>
609 <para>The time zone compiler</para>
610 <indexterm zone="ch-system-glibc zic">
611 <primary sortas="b-zic">zic</primary>
612 </indexterm>
613 </listitem>
614 </varlistentry>
615
616 <varlistentry id="ld.so">
617 <term><filename class="libraryfile">ld.so</filename></term>
618 <listitem>
619 <para>The helper program for shared library executables</para>
620 <indexterm zone="ch-system-glibc ld.so">
621 <primary sortas="c-ld.so">ld.so</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625
626 <varlistentry id="libBrokenLocale">
627 <term><filename class="libraryfile">libBrokenLocale</filename></term>
628 <listitem>
629 <para>Used internally by Glibc as a gross hack to get broken programs
630 (e.g., some Motif applications) running. See comments in
631 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
632 for more information</para>
633 <indexterm zone="ch-system-glibc libBrokenLocale">
634 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
635 </indexterm>
636 </listitem>
637 </varlistentry>
638
639 <varlistentry id="libSegFault">
640 <term><filename class="libraryfile">libSegFault</filename></term>
641 <listitem>
642 <para>The segmentation fault signal handler, used by
643 <command>catchsegv</command></para>
644 <indexterm zone="ch-system-glibc libSegFault">
645 <primary sortas="c-libSegFault">libSegFault</primary>
646 </indexterm>
647 </listitem>
648 </varlistentry>
649
650 <varlistentry id="libanl">
651 <term><filename class="libraryfile">libanl</filename></term>
652 <listitem>
653 <para>An asynchronous name lookup library</para>
654 <indexterm zone="ch-system-glibc libanl">
655 <primary sortas="c-libanl">libanl</primary>
656 </indexterm>
657 </listitem>
658 </varlistentry>
659
660 <varlistentry id="libbsd-compat">
661 <term><filename class="libraryfile">libbsd-compat</filename></term>
662 <listitem>
663 <para>Provides the portability needed in order to run certain
664 Berkeley Software Distribution (BSD) programs under Linux</para>
665 <indexterm zone="ch-system-glibc libbsd-compat">
666 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
667 </indexterm>
668 </listitem>
669 </varlistentry>
670
671 <varlistentry id="libc">
672 <term><filename class="libraryfile">libc</filename></term>
673 <listitem>
674 <para>The main C library</para>
675 <indexterm zone="ch-system-glibc libc">
676 <primary sortas="c-libc">libc</primary>
677 </indexterm>
678 </listitem>
679 </varlistentry>
680
681 <varlistentry id="libcidn">
682 <term><filename class="libraryfile">libcidn</filename></term>
683 <listitem>
684 <para>Used internally by Glibc for handling internationalized domain
685 names in the <function>getaddrinfo()</function> function</para>
686 <indexterm zone="ch-system-glibc libcrypt">
687 <primary sortas="c-libcrypt">libcrypt</primary>
688 </indexterm>
689 </listitem>
690 </varlistentry>
691
692 <varlistentry id="libcrypt">
693 <term><filename class="libraryfile">libcrypt</filename></term>
694 <listitem>
695 <para>The cryptography library</para>
696 <indexterm zone="ch-system-glibc libcrypt">
697 <primary sortas="c-libcrypt">libcrypt</primary>
698 </indexterm>
699 </listitem>
700 </varlistentry>
701
702 <varlistentry id="libdl">
703 <term><filename class="libraryfile">libdl</filename></term>
704 <listitem>
705 <para>The dynamic linking interface library</para>
706 <indexterm zone="ch-system-glibc libdl">
707 <primary sortas="c-libdl">libdl</primary>
708 </indexterm>
709 </listitem>
710 </varlistentry>
711
712 <varlistentry id="libg">
713 <term><filename class="libraryfile">libg</filename></term>
714 <listitem>
715 <para>Dummy library containing no functions. Previously was a runtime
716 library for <command>g++</command></para>
717 <indexterm zone="ch-system-glibc libg">
718 <primary sortas="c-libg">libg</primary>
719 </indexterm>
720 </listitem>
721 </varlistentry>
722
723 <varlistentry id="libieee">
724 <term><filename class="libraryfile">libieee</filename></term>
725 <listitem>
726 <para>Linking in this module forces error handling rules for math
727 functions as defined by the Institute of Electrical and Electronic
728 Engineers (IEEE). The default is POSIX.1 error handling</para>
729 <indexterm zone="ch-system-glibc libieee">
730 <primary sortas="c-libieee">libieee</primary>
731 </indexterm>
732 </listitem>
733 </varlistentry>
734
735 <varlistentry id="libm">
736 <term><filename class="libraryfile">libm</filename></term>
737 <listitem>
738 <para>The mathematical library</para>
739 <indexterm zone="ch-system-glibc libm">
740 <primary sortas="c-libm">libm</primary>
741 </indexterm>
742 </listitem>
743 </varlistentry>
744
745 <varlistentry id="libmcheck">
746 <term><filename class="libraryfile">libmcheck</filename></term>
747 <listitem>
748 <para>Turns on memory allocation checking when linked to</para>
749 <indexterm zone="ch-system-glibc libmcheck">
750 <primary sortas="c-libmcheck">libmcheck</primary>
751 </indexterm>
752 </listitem>
753 </varlistentry>
754
755 <varlistentry id="libmemusage">
756 <term><filename class="libraryfile">libmemusage</filename></term>
757 <listitem>
758 <para>Used by <command>memusage</command> to help collect
759 information about the memory usage of a program</para>
760 <indexterm zone="ch-system-glibc libmemusage">
761 <primary sortas="c-libmemusage">libmemusage</primary>
762 </indexterm>
763 </listitem>
764 </varlistentry>
765
766 <varlistentry id="libnsl">
767 <term><filename class="libraryfile">libnsl</filename></term>
768 <listitem>
769 <para>The network services library</para>
770 <indexterm zone="ch-system-glibc libnsl">
771 <primary sortas="c-libnsl">libnsl</primary>
772 </indexterm>
773 </listitem>
774 </varlistentry>
775
776 <varlistentry id="libnss">
777 <term><filename class="libraryfile">libnss</filename></term>
778 <listitem>
779 <para>The Name Service Switch libraries, containing functions for
780 resolving host names, user names, group names, aliases, services,
781 protocols, etc.</para>
782 <indexterm zone="ch-system-glibc libnss">
783 <primary sortas="c-libnss">libnss</primary>
784 </indexterm>
785 </listitem>
786 </varlistentry>
787
788 <varlistentry id="libpcprofile">
789 <term><filename class="libraryfile">libpcprofile</filename></term>
790 <listitem>
791 <para>Contains profiling functions used to track the amount of CPU
792 time spent in specific source code lines</para>
793 <indexterm zone="ch-system-glibc libpcprofile">
794 <primary sortas="c-libpcprofile">libpcprofile</primary>
795 </indexterm>
796 </listitem>
797 </varlistentry>
798
799 <varlistentry id="libpthread">
800 <term><filename class="libraryfile">libpthread</filename></term>
801 <listitem>
802 <para>The POSIX threads library</para>
803 <indexterm zone="ch-system-glibc libpthread">
804 <primary sortas="c-libpthread">libpthread</primary>
805 </indexterm>
806 </listitem>
807 </varlistentry>
808
809 <varlistentry id="libresolv">
810 <term><filename class="libraryfile">libresolv</filename></term>
811 <listitem>
812 <para>Contains functions for creating, sending, and interpreting
813 packets to the Internet domain name servers</para>
814 <indexterm zone="ch-system-glibc libresolv">
815 <primary sortas="c-libresolv">libresolv</primary>
816 </indexterm>
817 </listitem>
818 </varlistentry>
819
820 <varlistentry id="librpcsvc">
821 <term><filename class="libraryfile">librpcsvc</filename></term>
822 <listitem>
823 <para>Contains functions providing miscellaneous RPC services</para>
824 <indexterm zone="ch-system-glibc librpcsvc">
825 <primary sortas="c-librpcsvc">librpcsvc</primary>
826 </indexterm>
827 </listitem>
828 </varlistentry>
829
830 <varlistentry id="librt">
831 <term><filename class="libraryfile">librt</filename></term>
832 <listitem>
833 <para>Contains functions providing most of the interfaces specified
834 by the POSIX.1b Realtime Extension</para>
835 <indexterm zone="ch-system-glibc librt">
836 <primary sortas="c-librt">librt</primary>
837 </indexterm>
838 </listitem>
839 </varlistentry>
840
841 <varlistentry id="libthread_db">
842 <term><filename class="libraryfile">libthread_db</filename></term>
843 <listitem>
844 <para>Contains functions useful for building debuggers for
845 multi-threaded programs</para>
846 <indexterm zone="ch-system-glibc libthread_db">
847 <primary sortas="c-libthread_db">libthread_db</primary>
848 </indexterm>
849 </listitem>
850 </varlistentry>
851
852 <varlistentry id="libutil">
853 <term><filename class="libraryfile">libutil</filename></term>
854 <listitem>
855 <para>Contains code for <quote>standard</quote> functions used in
856 many different Unix utilities</para>
857 <indexterm zone="ch-system-glibc libutil">
858 <primary sortas="c-libutil">libutil</primary>
859 </indexterm>
860 </listitem>
861 </varlistentry>
862
863 </variablelist>
864
865 </sect2>
866
867</sect1>
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