source: chapter06/glibc.xml@ 9a31477

10.0 10.0-rc1 10.1 10.1-rc1 11.0 11.0-rc1 11.0-rc2 11.0-rc3 11.1 11.1-rc1 11.2 11.2-rc1 11.3 11.3-rc1 12.0 12.0-rc1 12.1 12.1-rc1 6.6 6.7 6.8 7.0 7.1 7.2 7.3 7.4 7.5 7.5-systemd 7.6 7.6-systemd 7.7 7.7-systemd 7.8 7.8-systemd 7.9 7.9-systemd 8.0 8.1 8.2 8.3 8.4 9.0 9.1 arm bdubbs/gcc13 ml-11.0 multilib renodr/libudev-from-systemd s6-init trunk xry111/arm64 xry111/arm64-12.0 xry111/clfs-ng xry111/lfs-next xry111/loongarch xry111/loongarch-12.0 xry111/loongarch-12.1 xry111/mips64el xry111/pip3 xry111/rust-wip-20221008 xry111/update-glibc
Last change on this file since 9a31477 was 9a31477, checked in by Matthew Burgess <matthew@…>, 14 years ago

Upgrade to Glibc-2.11. Fixes #2509.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9095 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
  • Property mode set to 100644
File size: 32.6 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <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<!--
65 This should have been fixed a long time ago.
66
67 <para>In the vi_VN.TCVN locale, <command>bash</command> enters an infinite
68 loop at startup. It is unknown whether this is a <command>bash</command>
69 bug or a Glibc problem. Disable installation of this locale in order to
70 avoid the problem:</para>
71
72<screen><userinput remap="pre">sed -i '/vi_VN.TCVN/d' localedata/SUPPORTED</userinput></screen>
73-->
74
75 <para>When running <command>make install</command>, a script called
76 <filename>test-installation.pl</filename> performs a small sanity test on
77 our newly installed Glibc. However, because our toolchain still points to
78 the <filename class="directory">/tools</filename> directory, the sanity
79 test would be carried out against the wrong Glibc. We can force the script
80 to check the Glibc we have just installed with the following:</para>
81
82<screen><userinput remap="pre">DL=$(readelf -l /bin/sh | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
83sed -i &quot;s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=$DL -o|&quot; \
84 scripts/test-installation.pl
85unset DL</userinput></screen>
86
87 <para>The <command>ldd</command> shell script contains Bash-specific
88 syntax. Change its default program interpreter to <command>/bin/bash</command>
89 in case another <command>/bin/sh</command> is installed as described in the
90 <ulink url="&blfs-root;view/svn/postlfs/shells.html">Shells</ulink>
91 chapter of the BLFS book:</para>
92
93<screen><userinput remap="pre">sed -i 's|@BASH@|/bin/bash|' elf/ldd.bash.in</userinput></screen>
94
95 <para>The Glibc documentation recommends building Glibc outside of the source
96 directory in a dedicated build directory:</para>
97
98<screen><userinput remap="pre">mkdir -v ../glibc-build
99cd ../glibc-build</userinput></screen>
100
101 <para>As in Chapter 5, add the needed compiler flags to CFLAGS for x86 machines.
102 Here, the optimization of the library is also set for the gcc compiler to
103 enhance compilation speed (-pipe) and package performance (-O3).</para>
104
105<screen><userinput remap="configure">case `uname -m` in
106 i?86) echo "CFLAGS += -march=i486 -mtune=native -O3 -pipe" &gt; configparms ;;
107esac</userinput></screen>
108
109 <para>Prepare Glibc for compilation:</para>
110
111<screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/usr \
112 --disable-profile --enable-add-ons \
113 --enable-kernel=2.6.18 --libexecdir=/usr/lib/glibc</userinput></screen>
114
115 <variablelist>
116 <title>The meaning of the new configure options:</title>
117
118 <varlistentry>
119 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
120 <listitem>
121 <para>This changes the location of the <command>pt_chown</command>
122 program from its default of <filename
123 class="directory">/usr/libexec</filename> to <filename
124 class="directory">/usr/lib/glibc</filename>.</para>
125 </listitem>
126 </varlistentry>
127
128 </variablelist>
129
130 <para>Compile the package:</para>
131
132<screen><userinput remap="make">make</userinput></screen>
133
134 <important>
135 <para>In this section, the test suite for Glibc is considered critical.
136 Do not skip it under any circumstance.</para>
137 </important>
138
139 <para>Before running the tests, copy a file from the source tree into our
140 build tree to prevent a couple of test failures, then test the
141 results:</para>
142
143<screen><userinput remap="test">cp -v ../glibc-&glibc-version;/iconvdata/gconv-modules iconvdata
144make -k check 2&gt;&amp;1 | tee glibc-check-log
145grep Error glibc-check-log</userinput></screen>
146
147 <para>You will probably see an expected (ignored) failure in the
148 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
149 is somewhat dependent on the host system. This is a list of the most
150 common issues:</para>
151
152 <itemizedlist>
153 <!-- Check again after updating from gcc-4.1.x -->
154 <listitem>
155 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
156 using the 4.1 series of GCC.</para>
157 </listitem>
158 <!-- Was true in glibc-2.3.6 -->
159 <listitem>
160 <para>The <emphasis>nptl/tst-clock2</emphasis> and
161 <emphasis>tst-attr3</emphasis> tests sometimes
162 fail. The reason is not completely understood, but indications
163 are that a heavy system load can trigger these failures.</para>
164 </listitem>
165 <listitem>
166 <para>The math tests sometimes fail when running on
167 systems where the CPU is not a relatively new genuine Intel or
168 authentic AMD processor.</para>
169 </listitem>
170 <listitem>
171 <para>If you have mounted the LFS partition with the
172 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
173 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
174 use the <parameter>noatime</parameter> option while building LFS.</para>
175 </listitem>
176 <listitem>
177 <para>When running on older and slower hardware or on systems under
178 load, some tests can fail because of test timeouts being exceeded.</para>
179 </listitem>
180 </itemizedlist>
181
182 <para>Though it is a harmless message, the install stage of Glibc will
183 complain about the absence of <filename>/etc/ld.so.conf</filename>.
184 Prevent this warning with:</para>
185
186<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
187
188 <para>Install the package:</para>
189
190<screen><userinput remap="install">make install</userinput></screen>
191
192 <para>The locales that can make the system respond in a different language
193 were not installed by the above command. None of the locales are required,
194 but if some of them are missing, testsuites of the future packages would
195 skip important testcases.</para>
196
197 <para>Individual locales can be installed using the
198 <command>localedef</command> program. E.g., the first
199 <command>localedef</command> command below combines the
200 <filename>/usr/share/i18n/locales/cs_CZ</filename>
201 charset-independent locale definition with the
202 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
203 charmap definition and appends the result to the
204 <filename>/usr/lib/locale/locale-archive</filename> file.
205 The following instructions will install the minimum set of
206 locales necessary for the optimal coverage of tests:</para>
207
208<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
209localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
210localedef -i de_DE -f ISO-8859-1 de_DE
211localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
212localedef -i de_DE -f UTF-8 de_DE.UTF-8
213localedef -i en_HK -f ISO-8859-1 en_HK
214localedef -i en_PH -f ISO-8859-1 en_PH
215localedef -i en_US -f ISO-8859-1 en_US
216localedef -i en_US -f UTF-8 en_US.UTF-8
217localedef -i es_MX -f ISO-8859-1 es_MX
218localedef -i fa_IR -f UTF-8 fa_IR
219localedef -i fr_FR -f ISO-8859-1 fr_FR
220localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
221localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
222localedef -i it_IT -f ISO-8859-1 it_IT
223localedef -i ja_JP -f EUC-JP ja_JP
224localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
225localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
226
227 <para>In addition, install the locale for your own country, language and
228 character set.</para>
229
230 <para>Alternatively, install all locales listed in the
231 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
232 (it includes every locale listed above and many more) at once with the
233 following time-consuming command:</para>
234
235<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
236
237 <para>Then use the <command>localedef</command> command to create and
238 install locales not listed in the
239 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
240 in the unlikely case you need them.</para>
241 <!-- The Live CD patches the localedata/SUPPORTED file instead of
242 running localedef, the results are equivalent -->
243
244 </sect2>
245
246 <sect2 id="conf-glibc" role="configuration">
247 <title>Configuring Glibc</title>
248
249 <indexterm zone="conf-glibc">
250 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
251 </indexterm>
252
253 <indexterm zone="conf-glibc">
254 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
255 </indexterm>
256
257 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
258 because, although Glibc provides defaults when this file is missing or corrupt,
259 the Glibc defaults do not work well in a networked environment. The time zone
260 also needs to be configured.</para>
261
262 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
263 following:</para>
264
265<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
266<literal># Begin /etc/nsswitch.conf
267
268passwd: files
269group: files
270shadow: files
271
272hosts: files dns
273networks: files
274
275protocols: files
276services: files
277ethers: files
278rpc: files
279
280# End /etc/nsswitch.conf</literal>
281EOF</userinput></screen>
282
283 <para>One way to determine the local time zone, run the following
284 script:</para>
285
286<screen role="nodump"><userinput>tzselect</userinput></screen>
287
288 <para>After answering a few questions about the location, the script will
289 output the name of the time zone (e.g.,
290 <emphasis>America/Edmonton</emphasis>). There are also some other possible
291 timezones listed in <filename
292 class='directory'>/usr/share/zoneinfo</filename> such as
293 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
294 are not identified by the script but can be used.</para>
295
296 <para>Then create the <filename>/etc/localtime</filename> file by
297 running:</para>
298
299<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
300 /etc/localtime</userinput></screen>
301
302 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
303 time zone selected (e.g., Canada/Eastern).</para>
304
305 <variablelist>
306 <title>The meaning of the cp option:</title>
307
308 <varlistentry>
309 <term><parameter>--remove-destination</parameter></term>
310 <listitem>
311 <para>This is needed to force removal of the already existing symbolic
312 link. The reason for copying the file instead of using a symlink is to
313 cover the situation where <filename class="directory">/usr</filename>
314 is on a separate partition. This could be important when booted into
315 single user mode.</para>
316 </listitem>
317 </varlistentry>
318
319 </variablelist>
320
321 </sect2>
322
323 <sect2 id="conf-ld" role="configuration">
324 <title>Configuring the Dynamic Loader</title>
325
326 <indexterm zone="conf-ld">
327 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
328 </indexterm>
329
330 <para>By default, the dynamic loader (<filename
331 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
332 <filename class="directory">/lib</filename> and <filename
333 class="directory">/usr/lib</filename> for dynamic libraries that are
334 needed by programs as they are run. However, if there are libraries in
335 directories other than <filename class="directory">/lib</filename> and
336 <filename class="directory">/usr/lib</filename>, these need to be added
337 to the <filename>/etc/ld.so.conf</filename> file in order for the
338 dynamic loader to find them. Two directories that are commonly known
339 to contain additional libraries are <filename
340 class="directory">/usr/local/lib</filename> and <filename
341 class="directory">/opt/lib</filename>, so add those directories to the
342 dynamic loader's search path.</para>
343
344 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
345 following:</para>
346
347<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
348<literal># Begin /etc/ld.so.conf
349
350/usr/local/lib
351/opt/lib
352
353# End /etc/ld.so.conf</literal>
354EOF</userinput></screen>
355
356 </sect2>
357
358 <sect2 id="contents-glibc" role="content">
359 <title>Contents of Glibc</title>
360
361 <segmentedlist>
362 <segtitle>Installed programs</segtitle>
363 <segtitle>Installed libraries</segtitle>
364
365 <seglistitem>
366 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
367 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
368 pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
369 zdump, and zic</seg>
370 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
371 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
372 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
373 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
374 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
375 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
376 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
377 libthread_db.so, and libutil.{a,so}</seg>
378 </seglistitem>
379 </segmentedlist>
380
381 <variablelist>
382 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
383 <?dbfo list-presentation="list"?>
384 <?dbhtml list-presentation="table"?>
385
386 <varlistentry id="catchsegv">
387 <term><command>catchsegv</command></term>
388 <listitem>
389 <para>Can be used to create a stack trace when a program
390 terminates with a segmentation fault</para>
391 <indexterm zone="ch-system-glibc catchsegv">
392 <primary sortas="b-catchsegv">catchsegv</primary>
393 </indexterm>
394 </listitem>
395 </varlistentry>
396
397 <varlistentry id="gencat">
398 <term><command>gencat</command></term>
399 <listitem>
400 <para>Generates message catalogues</para>
401 <indexterm zone="ch-system-glibc gencat">
402 <primary sortas="b-gencat">gencat</primary>
403 </indexterm>
404 </listitem>
405 </varlistentry>
406
407 <varlistentry id="getconf">
408 <term><command>getconf</command></term>
409 <listitem>
410 <para>Displays the system configuration values for file system
411 specific variables</para>
412 <indexterm zone="ch-system-glibc getconf">
413 <primary sortas="b-getconf">getconf</primary>
414 </indexterm>
415 </listitem>
416 </varlistentry>
417
418 <varlistentry id="getent">
419 <term><command>getent</command></term>
420 <listitem>
421 <para>Gets entries from an administrative database</para>
422 <indexterm zone="ch-system-glibc getent">
423 <primary sortas="b-getent">getent</primary>
424 </indexterm>
425 </listitem>
426 </varlistentry>
427
428 <varlistentry id="iconv">
429 <term><command>iconv</command></term>
430 <listitem>
431 <para>Performs character set conversion</para>
432 <indexterm zone="ch-system-glibc iconv">
433 <primary sortas="b-iconv">iconv</primary>
434 </indexterm>
435 </listitem>
436 </varlistentry>
437
438 <varlistentry id="iconvconfig">
439 <term><command>iconvconfig</command></term>
440 <listitem>
441 <para>Creates fastloading <command>iconv</command> module configuration
442 files</para>
443 <indexterm zone="ch-system-glibc iconvconfig">
444 <primary sortas="b-iconvconfig">iconvconfig</primary>
445 </indexterm>
446 </listitem>
447 </varlistentry>
448
449 <varlistentry id="ldconfig">
450 <term><command>ldconfig</command></term>
451 <listitem>
452 <para>Configures the dynamic linker runtime bindings</para>
453 <indexterm zone="ch-system-glibc ldconfig">
454 <primary sortas="b-ldconfig">ldconfig</primary>
455 </indexterm>
456 </listitem>
457 </varlistentry>
458
459 <varlistentry id="ldd">
460 <term><command>ldd</command></term>
461 <listitem>
462 <para>Reports which shared libraries are required
463 by each given program or shared library</para>
464 <indexterm zone="ch-system-glibc ldd">
465 <primary sortas="b-ldd">ldd</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="lddlibc4">
471 <term><command>lddlibc4</command></term>
472 <listitem>
473 <para>Assists <command>ldd</command> with object files</para>
474 <indexterm zone="ch-system-glibc lddlibc4">
475 <primary sortas="b-lddlibc4">lddlibc4</primary>
476 </indexterm>
477 </listitem>
478 </varlistentry>
479
480 <varlistentry id="locale">
481 <term><command>locale</command></term>
482 <listitem>
483 <para>Prints various information about the current locale</para>
484 <indexterm zone="ch-system-glibc locale">
485 <primary sortas="b-locale">locale</primary>
486 </indexterm>
487 </listitem>
488 </varlistentry>
489
490 <varlistentry id="localedef">
491 <term><command>localedef</command></term>
492 <listitem>
493 <para>Compiles locale specifications</para>
494 <indexterm zone="ch-system-glibc localedef">
495 <primary sortas="b-localedef">localedef</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="mtrace">
501 <term><command>mtrace</command></term>
502 <listitem>
503 <para>Reads and interprets a memory trace file and displays a summary
504 in human-readable format</para>
505 <indexterm zone="ch-system-glibc mtrace">
506 <primary sortas="b-mtrace">mtrace</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="nscd">
512 <term><command>nscd</command></term>
513 <listitem>
514 <para>A daemon that provides a cache for the most common name
515 service requests</para>
516 <indexterm zone="ch-system-glibc nscd">
517 <primary sortas="b-nscd">nscd</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="pcprofiledump">
523 <term><command>pcprofiledump</command></term>
524 <listitem>
525 <para>Dumps information generated by PC profiling</para>
526 <indexterm zone="ch-system-glibc pcprofiledump">
527 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
528 </indexterm>
529 </listitem>
530 </varlistentry>
531
532 <varlistentry id="pt_chown">
533 <term><command>pt_chown</command></term>
534 <listitem>
535 <para>A helper program for <command>grantpt</command> to set the owner,
536 group and access permissions of a slave pseudo terminal</para>
537 <indexterm zone="ch-system-glibc pt_chown">
538 <primary sortas="b-pt_chown">pt_chown</primary>
539 </indexterm>
540 </listitem>
541 </varlistentry>
542
543 <varlistentry id="rpcgen">
544 <term><command>rpcgen</command></term>
545 <listitem>
546 <para>Generates C code to implement the Remote Procedure Call (RPC)
547 protocol</para>
548 <indexterm zone="ch-system-glibc rpcgen">
549 <primary sortas="b-rpcgen">rpcgen</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="rpcinfo">
555 <term><command>rpcinfo</command></term>
556 <listitem>
557 <para>Makes an RPC call to an RPC server</para>
558 <indexterm zone="ch-system-glibc rpcinfo">
559 <primary sortas="b-rpcinfo">rpcinfo</primary>
560 </indexterm>
561 </listitem>
562 </varlistentry>
563
564 <varlistentry id="sln">
565 <term><command>sln</command></term>
566 <listitem>
567 <para>A statically linked <command>ln</command> program</para>
568 <indexterm zone="ch-system-glibc sln">
569 <primary sortas="b-sln">sln</primary>
570 </indexterm>
571 </listitem>
572 </varlistentry>
573
574 <varlistentry id="sprof">
575 <term><command>sprof</command></term>
576 <listitem>
577 <para>Reads and displays shared object profiling data</para>
578 <indexterm zone="ch-system-glibc sprof">
579 <primary sortas="b-sprof">sprof</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="tzselect">
585 <term><command>tzselect</command></term>
586 <listitem>
587 <para>Asks the user about the location of the system and reports
588 the corresponding time zone description</para>
589 <indexterm zone="ch-system-glibc tzselect">
590 <primary sortas="b-tzselect">tzselect</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594
595 <varlistentry id="xtrace">
596 <term><command>xtrace</command></term>
597 <listitem>
598 <para>Traces the execution of a program by printing the currently
599 executed function</para>
600 <indexterm zone="ch-system-glibc xtrace">
601 <primary sortas="b-xtrace">xtrace</primary>
602 </indexterm>
603 </listitem>
604 </varlistentry>
605
606 <varlistentry id="zdump">
607 <term><command>zdump</command></term>
608 <listitem>
609 <para>The time zone dumper</para>
610 <indexterm zone="ch-system-glibc zdump">
611 <primary sortas="b-zdump">zdump</primary>
612 </indexterm>
613 </listitem>
614 </varlistentry>
615
616 <varlistentry id="zic">
617 <term><command>zic</command></term>
618 <listitem>
619 <para>The time zone compiler</para>
620 <indexterm zone="ch-system-glibc zic">
621 <primary sortas="b-zic">zic</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625
626 <varlistentry id="ld.so">
627 <term><filename class="libraryfile">ld.so</filename></term>
628 <listitem>
629 <para>The helper program for shared library executables</para>
630 <indexterm zone="ch-system-glibc ld.so">
631 <primary sortas="c-ld.so">ld.so</primary>
632 </indexterm>
633 </listitem>
634 </varlistentry>
635
636 <varlistentry id="libBrokenLocale">
637 <term><filename class="libraryfile">libBrokenLocale</filename></term>
638 <listitem>
639 <para>Used internally by Glibc as a gross hack to get broken programs
640 (e.g., some Motif applications) running. See comments in
641 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
642 for more information</para>
643 <indexterm zone="ch-system-glibc libBrokenLocale">
644 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <varlistentry id="libSegFault">
650 <term><filename class="libraryfile">libSegFault</filename></term>
651 <listitem>
652 <para>The segmentation fault signal handler, used by
653 <command>catchsegv</command></para>
654 <indexterm zone="ch-system-glibc libSegFault">
655 <primary sortas="c-libSegFault">libSegFault</primary>
656 </indexterm>
657 </listitem>
658 </varlistentry>
659
660 <varlistentry id="libanl">
661 <term><filename class="libraryfile">libanl</filename></term>
662 <listitem>
663 <para>An asynchronous name lookup library</para>
664 <indexterm zone="ch-system-glibc libanl">
665 <primary sortas="c-libanl">libanl</primary>
666 </indexterm>
667 </listitem>
668 </varlistentry>
669
670 <varlistentry id="libbsd-compat">
671 <term><filename class="libraryfile">libbsd-compat</filename></term>
672 <listitem>
673 <para>Provides the portability needed in order to run certain
674 Berkeley Software Distribution (BSD) programs under Linux</para>
675 <indexterm zone="ch-system-glibc libbsd-compat">
676 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
677 </indexterm>
678 </listitem>
679 </varlistentry>
680
681 <varlistentry id="libc">
682 <term><filename class="libraryfile">libc</filename></term>
683 <listitem>
684 <para>The main C library</para>
685 <indexterm zone="ch-system-glibc libc">
686 <primary sortas="c-libc">libc</primary>
687 </indexterm>
688 </listitem>
689 </varlistentry>
690
691 <varlistentry id="libcidn">
692 <term><filename class="libraryfile">libcidn</filename></term>
693 <listitem>
694 <para>Used internally by Glibc for handling internationalized domain
695 names in the <function>getaddrinfo()</function> function</para>
696 <indexterm zone="ch-system-glibc libcidn">
697 <primary sortas="c-libcidn">libcidn</primary>
698 </indexterm>
699 </listitem>
700 </varlistentry>
701
702 <varlistentry id="libcrypt">
703 <term><filename class="libraryfile">libcrypt</filename></term>
704 <listitem>
705 <para>The cryptography library</para>
706 <indexterm zone="ch-system-glibc libcrypt">
707 <primary sortas="c-libcrypt">libcrypt</primary>
708 </indexterm>
709 </listitem>
710 </varlistentry>
711
712 <varlistentry id="libdl">
713 <term><filename class="libraryfile">libdl</filename></term>
714 <listitem>
715 <para>The dynamic linking interface library</para>
716 <indexterm zone="ch-system-glibc libdl">
717 <primary sortas="c-libdl">libdl</primary>
718 </indexterm>
719 </listitem>
720 </varlistentry>
721
722 <varlistentry id="libg">
723 <term><filename class="libraryfile">libg</filename></term>
724 <listitem>
725 <para>Dummy library containing no functions. Previously was a runtime
726 library for <command>g++</command></para>
727 <indexterm zone="ch-system-glibc libg">
728 <primary sortas="c-libg">libg</primary>
729 </indexterm>
730 </listitem>
731 </varlistentry>
732
733 <varlistentry id="libieee">
734 <term><filename class="libraryfile">libieee</filename></term>
735 <listitem>
736 <para>Linking in this module forces error handling rules for math
737 functions as defined by the Institute of Electrical and Electronic
738 Engineers (IEEE). The default is POSIX.1 error handling</para>
739 <indexterm zone="ch-system-glibc libieee">
740 <primary sortas="c-libieee">libieee</primary>
741 </indexterm>
742 </listitem>
743 </varlistentry>
744
745 <varlistentry id="libm">
746 <term><filename class="libraryfile">libm</filename></term>
747 <listitem>
748 <para>The mathematical library</para>
749 <indexterm zone="ch-system-glibc libm">
750 <primary sortas="c-libm">libm</primary>
751 </indexterm>
752 </listitem>
753 </varlistentry>
754
755 <varlistentry id="libmcheck">
756 <term><filename class="libraryfile">libmcheck</filename></term>
757 <listitem>
758 <para>Turns on memory allocation checking when linked to</para>
759 <indexterm zone="ch-system-glibc libmcheck">
760 <primary sortas="c-libmcheck">libmcheck</primary>
761 </indexterm>
762 </listitem>
763 </varlistentry>
764
765 <varlistentry id="libmemusage">
766 <term><filename class="libraryfile">libmemusage</filename></term>
767 <listitem>
768 <para>Used by <command>memusage</command> to help collect
769 information about the memory usage of a program</para>
770 <indexterm zone="ch-system-glibc libmemusage">
771 <primary sortas="c-libmemusage">libmemusage</primary>
772 </indexterm>
773 </listitem>
774 </varlistentry>
775
776 <varlistentry id="libnsl">
777 <term><filename class="libraryfile">libnsl</filename></term>
778 <listitem>
779 <para>The network services library</para>
780 <indexterm zone="ch-system-glibc libnsl">
781 <primary sortas="c-libnsl">libnsl</primary>
782 </indexterm>
783 </listitem>
784 </varlistentry>
785
786 <varlistentry id="libnss">
787 <term><filename class="libraryfile">libnss</filename></term>
788 <listitem>
789 <para>The Name Service Switch libraries, containing functions for
790 resolving host names, user names, group names, aliases, services,
791 protocols, etc.</para>
792 <indexterm zone="ch-system-glibc libnss">
793 <primary sortas="c-libnss">libnss</primary>
794 </indexterm>
795 </listitem>
796 </varlistentry>
797
798 <varlistentry id="libpcprofile">
799 <term><filename class="libraryfile">libpcprofile</filename></term>
800 <listitem>
801 <para>Contains profiling functions used to track the amount of CPU
802 time spent in specific source code lines</para>
803 <indexterm zone="ch-system-glibc libpcprofile">
804 <primary sortas="c-libpcprofile">libpcprofile</primary>
805 </indexterm>
806 </listitem>
807 </varlistentry>
808
809 <varlistentry id="libpthread">
810 <term><filename class="libraryfile">libpthread</filename></term>
811 <listitem>
812 <para>The POSIX threads library</para>
813 <indexterm zone="ch-system-glibc libpthread">
814 <primary sortas="c-libpthread">libpthread</primary>
815 </indexterm>
816 </listitem>
817 </varlistentry>
818
819 <varlistentry id="libresolv">
820 <term><filename class="libraryfile">libresolv</filename></term>
821 <listitem>
822 <para>Contains functions for creating, sending, and interpreting
823 packets to the Internet domain name servers</para>
824 <indexterm zone="ch-system-glibc libresolv">
825 <primary sortas="c-libresolv">libresolv</primary>
826 </indexterm>
827 </listitem>
828 </varlistentry>
829
830 <varlistentry id="librpcsvc">
831 <term><filename class="libraryfile">librpcsvc</filename></term>
832 <listitem>
833 <para>Contains functions providing miscellaneous RPC services</para>
834 <indexterm zone="ch-system-glibc librpcsvc">
835 <primary sortas="c-librpcsvc">librpcsvc</primary>
836 </indexterm>
837 </listitem>
838 </varlistentry>
839
840 <varlistentry id="librt">
841 <term><filename class="libraryfile">librt</filename></term>
842 <listitem>
843 <para>Contains functions providing most of the interfaces specified
844 by the POSIX.1b Realtime Extension</para>
845 <indexterm zone="ch-system-glibc librt">
846 <primary sortas="c-librt">librt</primary>
847 </indexterm>
848 </listitem>
849 </varlistentry>
850
851 <varlistentry id="libthread_db">
852 <term><filename class="libraryfile">libthread_db</filename></term>
853 <listitem>
854 <para>Contains functions useful for building debuggers for
855 multi-threaded programs</para>
856 <indexterm zone="ch-system-glibc libthread_db">
857 <primary sortas="c-libthread_db">libthread_db</primary>
858 </indexterm>
859 </listitem>
860 </varlistentry>
861
862 <varlistentry id="libutil">
863 <term><filename class="libraryfile">libutil</filename></term>
864 <listitem>
865 <para>Contains code for <quote>standard</quote> functions used in
866 many different Unix utilities</para>
867 <indexterm zone="ch-system-glibc libutil">
868 <primary sortas="c-libutil">libutil</primary>
869 </indexterm>
870 </listitem>
871 </varlistentry>
872
873 </variablelist>
874
875 </sect2>
876
877</sect1>
Note: See TracBrowser for help on using the repository browser.