source: chapter06/glibc.xml@ 7bb9fda

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Last change on this file since 7bb9fda was 7bb9fda, checked in by Bruce Dubbs <bdubbs@…>, 9 years ago

Minor text and punctuation updates

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-system-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Glibc package contains the main C library. This library provides
27 the basic routines for allocating memory, searching directories, opening and
28 closing files, reading and writing files, string handling, pattern matching,
29 arithmetic, and so on.</para>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-ch6-sbu;</seg>
37 <seg>&glibc-ch6-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <note>
47 <para>Some packages outside of LFS suggest installing GNU libiconv in
48 order to translate data from one encoding to another. The project's
49 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
50 <quote>This library provides an <function>iconv()</function>
51 implementation, for use on systems which don't have one, or whose
52 implementation cannot convert from/to Unicode.</quote> Glibc provides
53 an <function>iconv()</function> implementation and can convert from/to
54 Unicode, therefore libiconv is not required on an LFS system.</para>
55 </note>
56
57 <para>Some of the Glibc programs use non-FHS compilant
58 <filename class="directory">/var/db</filename> directory to store
59 their runtime data. Apply the following patch to make such programs
60 store their runtime data in the FHS-compliant locations:</para>
61
62<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
63
64 <para>The Glibc build system is self-contained and will install
65 perfectly, even though the compiler specs file and linker are still
66 pointing at <filename class="directory">/tools</filename>. The specs
67 and linker cannot be adjusted before the Glibc install because the
68 Glibc autoconf tests would give false results and defeat the goal
69 of achieving a clean build.</para>
70
71 <para>The Glibc documentation recommends building Glibc outside of the source
72 directory in a dedicated build directory:</para>
73
74<screen><userinput remap="pre">mkdir -v ../glibc-build
75cd ../glibc-build</userinput></screen>
76
77 <para>Prepare Glibc for compilation:</para>
78
79<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
80 --prefix=/usr \
81 --disable-profile \
82 --enable-kernel=&min-kernel; \
83 --enable-obsolete-rpc</userinput></screen>
84
85 <variablelist>
86 <title>The meaning of the new configure options:</title>
87
88 <varlistentry>
89 <term><parameter>--enable-obsolete-rpc</parameter></term>
90 <listitem>
91 <para>Installs NIS and RPC related headers that are not installed by
92 default; these are required to rebuild Glibc and by several BLFS
93 packages.</para>
94 </listitem>
95 </varlistentry>
96
97 </variablelist>
98
99 <para>Compile the package:</para>
100
101<screen><userinput remap="make">make</userinput></screen>
102
103 <important>
104 <para>In this section, the test suite for Glibc is considered critical.
105 Do not skip it under any circumstance.</para>
106 </important>
107
108 <para>Generally a few tests do not pass, but you can generally ignore
109 any of the test failures listed below. Now test the build results:</para>
110
111<screen><userinput remap="test">make check</userinput></screen>
112
113 <para>You will probably see some test failures. The Glibc test suite is
114 somewhat dependent on the host system. This is a list of the most common
115 issues seen for this version of LFS:</para>
116
117 <itemizedlist>
118
119 <listitem>
120 <para>The <emphasis>tst/tst-cputimer1</emphasis> and
121 <emphasis>rt/tst-cpuclock2</emphasis> tests have been known to
122 fail. The reason is not completely understood, but indications are
123 that minor timing issues can trigger these failures.</para>
124 </listitem>
125
126 <listitem>
127 <para>The math tests sometimes fail when running on
128 systems where the CPU is not a relatively new genuine Intel or
129 authentic AMD processor.</para>
130 </listitem>
131<!--
132 <listitem>
133 <para>When running on older and slower hardware or on systems under
134 load, some tests can fail because of test timeouts being exceeded.
135 Modifying the make check command to set a TIMEOUTFACTOR is reported to
136 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
137 make -k check</command>).</para>
138 </listitem>
139-->
140 <listitem>
141 <para>posix/tst-getaddrinfo4 and posix/tst-getaddrinfo5 will always fail
142 due to not having a network connection when the tests are run.</para>
143 </listitem>
144<!--
145 <listitem>
146 <para>libio/tst-ftell-partial-wide.out fails because it needs a locale
147 that has not yet been generated.</para>
148 </listitem>
149-->
150 <listitem>
151 <para>Other tests known to fail on some architectures are
152 malloc/tst-malloc-usable and nptl/tst-cleanupx4. </para>
153 </listitem>
154
155 </itemizedlist>
156
157 <para>Though it is a harmless message, the install stage of Glibc will
158 complain about the absence of <filename>/etc/ld.so.conf</filename>.
159 Prevent this warning with:</para>
160
161<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
162
163 <para>Install the package:</para>
164
165<screen><userinput remap="install">make install</userinput></screen>
166
167 <para>Install the configuration file and runtime directory for
168 <command>nscd</command>:</para>
169
170<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
171mkdir -pv /var/cache/nscd</userinput></screen>
172
173 <para>The locales that can make the system respond in a different language
174 were not installed by the above command. None of the locales are required,
175 but if some of them are missing, test suites of the future packages would
176 skip important testcases.</para>
177
178 <para>Individual locales can be installed using the
179 <command>localedef</command> program. E.g., the first
180 <command>localedef</command> command below combines the
181 <filename>/usr/share/i18n/locales/cs_CZ</filename>
182 charset-independent locale definition with the
183 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
184 charmap definition and appends the result to the
185 <filename>/usr/lib/locale/locale-archive</filename> file.
186 The following instructions will install the minimum set of
187 locales necessary for the optimal coverage of tests:</para>
188
189<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
190localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
191localedef -i de_DE -f ISO-8859-1 de_DE
192localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
193localedef -i de_DE -f UTF-8 de_DE.UTF-8
194localedef -i en_GB -f UTF-8 en_GB.UTF-8
195localedef -i en_HK -f ISO-8859-1 en_HK
196localedef -i en_PH -f ISO-8859-1 en_PH
197localedef -i en_US -f ISO-8859-1 en_US
198localedef -i en_US -f UTF-8 en_US.UTF-8
199localedef -i es_MX -f ISO-8859-1 es_MX
200localedef -i fa_IR -f UTF-8 fa_IR
201localedef -i fr_FR -f ISO-8859-1 fr_FR
202localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
203localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
204localedef -i it_IT -f ISO-8859-1 it_IT
205localedef -i it_IT -f UTF-8 it_IT.UTF-8
206localedef -i ja_JP -f EUC-JP ja_JP
207localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
208localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
209localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
210localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
211
212 <para>In addition, install the locale for your own country, language and
213 character set.</para>
214
215 <para>Alternatively, install all locales listed in the
216 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
217 (it includes every locale listed above and many more) at once with the
218 following time-consuming command:</para>
219
220<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
221
222 <para>Then use the <command>localedef</command> command to create and
223 install locales not listed in the
224 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
225 in the unlikely case you need them.</para>
226
227 </sect2>
228
229 <sect2 id="conf-glibc" role="configuration">
230 <title>Configuring Glibc</title>
231
232 <indexterm zone="conf-glibc">
233 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
234 </indexterm>
235
236 <indexterm zone="conf-glibc">
237 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
238 </indexterm>
239
240 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
241 because, although Glibc provides defaults when this file is missing or corrupt,
242 the Glibc defaults do not work well in a networked environment. The time zone
243 also needs to be configured.</para>
244
245 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
246 following:</para>
247
248<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
249<literal># Begin /etc/nsswitch.conf
250
251passwd: files
252group: files
253shadow: files
254
255hosts: files dns
256networks: files
257
258protocols: files
259services: files
260ethers: files
261rpc: files
262
263# End /etc/nsswitch.conf</literal>
264EOF</userinput></screen>
265
266 <para>Install timezone data:</para>
267<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
268
269ZONEINFO=/usr/share/zoneinfo
270mkdir -pv $ZONEINFO/{posix,right}
271
272for tz in etcetera southamerica northamerica europe africa antarctica \
273 asia australasia backward pacificnew systemv; do
274 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
275 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
276 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
277done
278
279cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
280zic -d $ZONEINFO -p America/New_York
281unset ZONEINFO</userinput></screen>
282
283 <variablelist>
284 <title>The meaning of the zic commands:</title>
285
286 <varlistentry>
287 <term><parameter>zic -L /dev/null ...</parameter></term>
288 <listitem>
289 <para>This creates posix timezones, without any leap seconds. It is
290 conventional to put these in both
291 <filename class="directory">zoneinfo</filename> and
292 <filename class="directory">zoneinfo/posix</filename>. It is
293 necessary to put the POSIX timezones in
294 <filename class="directory">zoneinfo</filename>, otherwise various
295 test-suites will report errors. On an embedded system, where space is
296 tight and you do not intend to ever update the timezones, you could save
297 1.9MB by not using the <filename class="directory">posix</filename>
298 directory, but some applications or test-suites might produce some
299 failures.</para>
300 </listitem>
301 </varlistentry>
302 <varlistentry>
303 <term><parameter>zic -L leapseconds ...</parameter></term>
304 <listitem>
305 <para>This creates right timezones, including leap seconds. On an
306 embedded system, where space is tight and you do not intend to
307 ever update the timezones, or care about the correct time, you could
308 save 1.9MB by omitting the <filename class="directory">right</filename>
309 directory.</para>
310 </listitem>
311 </varlistentry>
312 <varlistentry>
313 <term><parameter>zic ... -p ...</parameter></term>
314 <listitem>
315 <para>This creates the <filename>posixrules</filename> file. We use
316 New York because POSIX requires the daylight savings time rules
317 to be in accordance with US rules.</para>
318 </listitem>
319 </varlistentry>
320 </variablelist>
321
322
323 <para>One way to determine the local time zone is to run the following
324 script:</para>
325
326<screen role="nodump"><userinput>tzselect</userinput></screen>
327
328 <para>After answering a few questions about the location, the script will
329 output the name of the time zone (e.g.,
330 <emphasis>America/Edmonton</emphasis>). There are also some other possible
331 timezones listed in <filename
332 class='directory'>/usr/share/zoneinfo</filename> such as
333 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
334 are not identified by the script but can be used.</para>
335
336 <para>Then create the <filename>/etc/localtime</filename> file by
337 running:</para>
338
339<screen><userinput>cp -v /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
340
341 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
342 time zone selected (e.g., Canada/Eastern).</para>
343
344 </sect2>
345
346 <sect2 id="conf-ld" role="configuration">
347 <title>Configuring the Dynamic Loader</title>
348
349 <indexterm zone="conf-ld">
350 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
351 </indexterm>
352
353 <para>By default, the dynamic loader (<filename
354 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
355 <filename class="directory">/lib</filename> and <filename
356 class="directory">/usr/lib</filename> for dynamic libraries that are
357 needed by programs as they are run. However, if there are libraries in
358 directories other than <filename class="directory">/lib</filename> and
359 <filename class="directory">/usr/lib</filename>, these need to be added
360 to the <filename>/etc/ld.so.conf</filename> file in order for the
361 dynamic loader to find them. Two directories that are commonly known
362 to contain additional libraries are <filename
363 class="directory">/usr/local/lib</filename> and <filename
364 class="directory">/opt/lib</filename>, so add those directories to the
365 dynamic loader's search path.</para>
366
367 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
368 following:</para>
369
370<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
371<literal># Begin /etc/ld.so.conf
372/usr/local/lib
373/opt/lib
374</literal>
375EOF</userinput></screen>
376
377 <para>If desired, the dynamic loader can also search a directory and
378 include the contents of files found there. Generally the files in
379 this include directory are one line specifying the desired library path.
380 To add this capability run the following commands:</para>
381
382<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
383<literal># Add an include directory
384include /etc/ld.so.conf.d/*.conf
385</literal>
386EOF
387mkdir -pv /etc/ld.so.conf.d</userinput></screen>
388
389 </sect2>
390
391 <sect2 id="contents-glibc" role="content">
392 <title>Contents of Glibc</title>
393
394 <segmentedlist>
395 <segtitle>Installed programs</segtitle>
396 <segtitle>Installed libraries</segtitle>
397 <segtitle>Installed directories</segtitle>
398
399 <seglistitem>
400 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
401 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
402 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
403 zdump, and zic</seg>
404 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
405 libc.{a,so}, libc_nonshared.a, libcidn.so,
406 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
407 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
408 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
409 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
410 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
411 libthread_db.so, and libutil.{a,so}</seg>
412 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
413 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
414 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
415 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
416 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
417 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
418 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
419 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
420 /var/cache/nscd, and /var/lib/nss_db</seg>
421 </seglistitem>
422 </segmentedlist>
423
424 <variablelist>
425 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
426 <?dbfo list-presentation="list"?>
427 <?dbhtml list-presentation="table"?>
428
429 <varlistentry id="catchsegv">
430 <term><command>catchsegv</command></term>
431 <listitem>
432 <para>Can be used to create a stack trace when a program
433 terminates with a segmentation fault</para>
434 <indexterm zone="ch-system-glibc catchsegv">
435 <primary sortas="b-catchsegv">catchsegv</primary>
436 </indexterm>
437 </listitem>
438 </varlistentry>
439
440 <varlistentry id="gencat">
441 <term><command>gencat</command></term>
442 <listitem>
443 <para>Generates message catalogues</para>
444 <indexterm zone="ch-system-glibc gencat">
445 <primary sortas="b-gencat">gencat</primary>
446 </indexterm>
447 </listitem>
448 </varlistentry>
449
450 <varlistentry id="getconf">
451 <term><command>getconf</command></term>
452 <listitem>
453 <para>Displays the system configuration values for file system
454 specific variables</para>
455 <indexterm zone="ch-system-glibc getconf">
456 <primary sortas="b-getconf">getconf</primary>
457 </indexterm>
458 </listitem>
459 </varlistentry>
460
461 <varlistentry id="getent">
462 <term><command>getent</command></term>
463 <listitem>
464 <para>Gets entries from an administrative database</para>
465 <indexterm zone="ch-system-glibc getent">
466 <primary sortas="b-getent">getent</primary>
467 </indexterm>
468 </listitem>
469 </varlistentry>
470
471 <varlistentry id="iconv">
472 <term><command>iconv</command></term>
473 <listitem>
474 <para>Performs character set conversion</para>
475 <indexterm zone="ch-system-glibc iconv">
476 <primary sortas="b-iconv">iconv</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="iconvconfig">
482 <term><command>iconvconfig</command></term>
483 <listitem>
484 <para>Creates fastloading <command>iconv</command> module configuration
485 files</para>
486 <indexterm zone="ch-system-glibc iconvconfig">
487 <primary sortas="b-iconvconfig">iconvconfig</primary>
488 </indexterm>
489 </listitem>
490 </varlistentry>
491
492 <varlistentry id="ldconfig">
493 <term><command>ldconfig</command></term>
494 <listitem>
495 <para>Configures the dynamic linker runtime bindings</para>
496 <indexterm zone="ch-system-glibc ldconfig">
497 <primary sortas="b-ldconfig">ldconfig</primary>
498 </indexterm>
499 </listitem>
500 </varlistentry>
501
502 <varlistentry id="ldd">
503 <term><command>ldd</command></term>
504 <listitem>
505 <para>Reports which shared libraries are required
506 by each given program or shared library</para>
507 <indexterm zone="ch-system-glibc ldd">
508 <primary sortas="b-ldd">ldd</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="lddlibc4">
514 <term><command>lddlibc4</command></term>
515 <listitem>
516 <para>Assists <command>ldd</command> with object files</para>
517 <indexterm zone="ch-system-glibc lddlibc4">
518 <primary sortas="b-lddlibc4">lddlibc4</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="locale">
524 <term><command>locale</command></term>
525 <listitem>
526 <para>Prints various information about the current locale</para>
527 <indexterm zone="ch-system-glibc locale">
528 <primary sortas="b-locale">locale</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="localedef">
534 <term><command>localedef</command></term>
535 <listitem>
536 <para>Compiles locale specifications</para>
537 <indexterm zone="ch-system-glibc localedef">
538 <primary sortas="b-localedef">localedef</primary>
539 </indexterm>
540 </listitem>
541 </varlistentry>
542
543 <varlistentry id="makedb">
544 <term><command>makedb</command></term>
545 <listitem>
546 <para>Creates a simple database from textual input</para>
547 <indexterm zone="ch-system-glibc makedb">
548 <primary sortas="b-makedb">makedb</primary>
549 </indexterm>
550 </listitem>
551 </varlistentry>
552
553 <varlistentry id="mtrace">
554 <term><command>mtrace</command></term>
555 <listitem>
556 <para>Reads and interprets a memory trace file and displays a summary
557 in human-readable format</para>
558 <indexterm zone="ch-system-glibc mtrace">
559 <primary sortas="b-mtrace">mtrace</primary>
560 </indexterm>
561 </listitem>
562 </varlistentry>
563
564 <varlistentry id="nscd">
565 <term><command>nscd</command></term>
566 <listitem>
567 <para>A daemon that provides a cache for the most common name
568 service requests</para>
569 <indexterm zone="ch-system-glibc nscd">
570 <primary sortas="b-nscd">nscd</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="pcprofiledump">
576 <term><command>pcprofiledump</command></term>
577 <listitem>
578 <para>Dumps information generated by PC profiling</para>
579 <indexterm zone="ch-system-glibc pcprofiledump">
580 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="pldd">
586 <term><command>pldd</command></term>
587 <listitem>
588 <para>Lists dynamic shared objects used by running processes</para>
589 <indexterm zone="ch-system-glibc pldd">
590 <primary sortas="b-pldd">pldd</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594<!--
595 <varlistentry id="pt_chown">
596 <term><command>pt_chown</command></term>
597 <listitem>
598 <para>A helper program for <command>grantpt</command> to set the owner,
599 group and access permissions of a slave pseudo terminal</para>
600 <indexterm zone="ch-system-glibc pt_chown">
601 <primary sortas="b-pt_chown">pt_chown</primary>
602 </indexterm>
603 </listitem>
604 </varlistentry>
605-->
606 <varlistentry id="rpcgen">
607 <term><command>rpcgen</command></term>
608 <listitem>
609 <para>Generates C code to implement the Remote Procedure Call (RPC)
610 protocol</para>
611 <indexterm zone="ch-system-glibc rpcgen">
612 <primary sortas="b-rpcgen">rpcgen</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry>
616
617 <varlistentry id="sln">
618 <term><command>sln</command></term>
619 <listitem>
620 <para>A statically linked <command>ln</command> program</para>
621 <indexterm zone="ch-system-glibc sln">
622 <primary sortas="b-sln">sln</primary>
623 </indexterm>
624 </listitem>
625 </varlistentry>
626
627 <varlistentry id="sotruss">
628 <term><command>sotruss</command></term>
629 <listitem>
630 <para>Traces shared library procedure calls of a specified command</para>
631 <indexterm zone="ch-system-glibc sotruss">
632 <primary sortas="b-sotruss">sotruss</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="sprof">
638 <term><command>sprof</command></term>
639 <listitem>
640 <para>Reads and displays shared object profiling data</para>
641 <indexterm zone="ch-system-glibc sprof">
642 <primary sortas="b-sprof">sprof</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="tzselect">
648 <term><command>tzselect</command></term>
649 <listitem>
650 <para>Asks the user about the location of the system and reports
651 the corresponding time zone description</para>
652 <indexterm zone="ch-system-glibc tzselect">
653 <primary sortas="b-tzselect">tzselect</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry>
657
658 <varlistentry id="xtrace">
659 <term><command>xtrace</command></term>
660 <listitem>
661 <para>Traces the execution of a program by printing the currently
662 executed function</para>
663 <indexterm zone="ch-system-glibc xtrace">
664 <primary sortas="b-xtrace">xtrace</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="zdump">
670 <term><command>zdump</command></term>
671 <listitem>
672 <para>The time zone dumper</para>
673 <indexterm zone="ch-system-glibc zdump">
674 <primary sortas="b-zdump">zdump</primary>
675 </indexterm>
676 </listitem>
677 </varlistentry>
678
679 <varlistentry id="zic">
680 <term><command>zic</command></term>
681 <listitem>
682 <para>The time zone compiler</para>
683 <indexterm zone="ch-system-glibc zic">
684 <primary sortas="b-zic">zic</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="ld.so">
690 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
691 <listitem>
692 <para>The helper program for shared library executables</para>
693 <indexterm zone="ch-system-glibc ld.so">
694 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
695 </indexterm>
696 </listitem>
697 </varlistentry>
698
699 <varlistentry id="libBrokenLocale">
700 <term><filename class="libraryfile">libBrokenLocale</filename></term>
701 <listitem>
702 <para>Used internally by Glibc as a gross hack to get broken programs
703 (e.g., some Motif applications) running. See comments in
704 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
705 for more information</para>
706 <indexterm zone="ch-system-glibc libBrokenLocale">
707 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
708 </indexterm>
709 </listitem>
710 </varlistentry>
711
712 <varlistentry id="libSegFault">
713 <term><filename class="libraryfile">libSegFault</filename></term>
714 <listitem>
715 <para>The segmentation fault signal handler, used by
716 <command>catchsegv</command></para>
717 <indexterm zone="ch-system-glibc libSegFault">
718 <primary sortas="c-libSegFault">libSegFault</primary>
719 </indexterm>
720 </listitem>
721 </varlistentry>
722
723 <varlistentry id="libanl">
724 <term><filename class="libraryfile">libanl</filename></term>
725 <listitem>
726 <para>An asynchronous name lookup library</para>
727 <indexterm zone="ch-system-glibc libanl">
728 <primary sortas="c-libanl">libanl</primary>
729 </indexterm>
730 </listitem>
731 </varlistentry>
732
733 <varlistentry id="libc">
734 <term><filename class="libraryfile">libc</filename></term>
735 <listitem>
736 <para>The main C library</para>
737 <indexterm zone="ch-system-glibc libc">
738 <primary sortas="c-libc">libc</primary>
739 </indexterm>
740 </listitem>
741 </varlistentry>
742
743 <varlistentry id="libcidn">
744 <term><filename class="libraryfile">libcidn</filename></term>
745 <listitem>
746 <para>Used internally by Glibc for handling internationalized domain
747 names in the <function>getaddrinfo()</function> function</para>
748 <indexterm zone="ch-system-glibc libcidn">
749 <primary sortas="c-libcidn">libcidn</primary>
750 </indexterm>
751 </listitem>
752 </varlistentry>
753
754 <varlistentry id="libcrypt">
755 <term><filename class="libraryfile">libcrypt</filename></term>
756 <listitem>
757 <para>The cryptography library</para>
758 <indexterm zone="ch-system-glibc libcrypt">
759 <primary sortas="c-libcrypt">libcrypt</primary>
760 </indexterm>
761 </listitem>
762 </varlistentry>
763
764 <varlistentry id="libdl">
765 <term><filename class="libraryfile">libdl</filename></term>
766 <listitem>
767 <para>The dynamic linking interface library</para>
768 <indexterm zone="ch-system-glibc libdl">
769 <primary sortas="c-libdl">libdl</primary>
770 </indexterm>
771 </listitem>
772 </varlistentry>
773
774 <varlistentry id="libg">
775 <term><filename class="libraryfile">libg</filename></term>
776 <listitem>
777 <para>Dummy library containing no functions. Previously was a runtime
778 library for <command>g++</command></para>
779 <indexterm zone="ch-system-glibc libg">
780 <primary sortas="c-libg">libg</primary>
781 </indexterm>
782 </listitem>
783 </varlistentry>
784
785 <varlistentry id="libieee">
786 <term><filename class="libraryfile">libieee</filename></term>
787 <listitem>
788 <para>Linking in this module forces error handling rules for math
789 functions as defined by the Institute of Electrical and Electronic
790 Engineers (IEEE). The default is POSIX.1 error handling</para>
791 <indexterm zone="ch-system-glibc libieee">
792 <primary sortas="c-libieee">libieee</primary>
793 </indexterm>
794 </listitem>
795 </varlistentry>
796
797 <varlistentry id="libm">
798 <term><filename class="libraryfile">libm</filename></term>
799 <listitem>
800 <para>The mathematical library</para>
801 <indexterm zone="ch-system-glibc libm">
802 <primary sortas="c-libm">libm</primary>
803 </indexterm>
804 </listitem>
805 </varlistentry>
806
807 <varlistentry id="libmcheck">
808 <term><filename class="libraryfile">libmcheck</filename></term>
809 <listitem>
810 <para>Turns on memory allocation checking when linked to</para>
811 <indexterm zone="ch-system-glibc libmcheck">
812 <primary sortas="c-libmcheck">libmcheck</primary>
813 </indexterm>
814 </listitem>
815 </varlistentry>
816
817 <varlistentry id="libmemusage">
818 <term><filename class="libraryfile">libmemusage</filename></term>
819 <listitem>
820 <para>Used by <command>memusage</command> to help collect
821 information about the memory usage of a program</para>
822 <indexterm zone="ch-system-glibc libmemusage">
823 <primary sortas="c-libmemusage">libmemusage</primary>
824 </indexterm>
825 </listitem>
826 </varlistentry>
827
828 <varlistentry id="libnsl">
829 <term><filename class="libraryfile">libnsl</filename></term>
830 <listitem>
831 <para>The network services library</para>
832 <indexterm zone="ch-system-glibc libnsl">
833 <primary sortas="c-libnsl">libnsl</primary>
834 </indexterm>
835 </listitem>
836 </varlistentry>
837
838 <varlistentry id="libnss">
839 <term><filename class="libraryfile">libnss</filename></term>
840 <listitem>
841 <para>The Name Service Switch libraries, containing functions for
842 resolving host names, user names, group names, aliases, services,
843 protocols, etc.</para>
844 <indexterm zone="ch-system-glibc libnss">
845 <primary sortas="c-libnss">libnss</primary>
846 </indexterm>
847 </listitem>
848 </varlistentry>
849
850 <varlistentry id="libpcprofile">
851 <term><filename class="libraryfile">libpcprofile</filename></term>
852 <listitem>
853 <para>Contains profiling functions used to track the amount of CPU
854 time spent in specific source code lines</para>
855 <indexterm zone="ch-system-glibc libpcprofile">
856 <primary sortas="c-libpcprofile">libpcprofile</primary>
857 </indexterm>
858 </listitem>
859 </varlistentry>
860
861 <varlistentry id="libpthread">
862 <term><filename class="libraryfile">libpthread</filename></term>
863 <listitem>
864 <para>The POSIX threads library</para>
865 <indexterm zone="ch-system-glibc libpthread">
866 <primary sortas="c-libpthread">libpthread</primary>
867 </indexterm>
868 </listitem>
869 </varlistentry>
870
871 <varlistentry id="libresolv">
872 <term><filename class="libraryfile">libresolv</filename></term>
873 <listitem>
874 <para>Contains functions for creating, sending, and interpreting
875 packets to the Internet domain name servers</para>
876 <indexterm zone="ch-system-glibc libresolv">
877 <primary sortas="c-libresolv">libresolv</primary>
878 </indexterm>
879 </listitem>
880 </varlistentry>
881
882 <varlistentry id="librpcsvc">
883 <term><filename class="libraryfile">librpcsvc</filename></term>
884 <listitem>
885 <para>Contains functions providing miscellaneous RPC services</para>
886 <indexterm zone="ch-system-glibc librpcsvc">
887 <primary sortas="c-librpcsvc">librpcsvc</primary>
888 </indexterm>
889 </listitem>
890 </varlistentry>
891
892 <varlistentry id="librt">
893 <term><filename class="libraryfile">librt</filename></term>
894 <listitem>
895 <para>Contains functions providing most of the interfaces specified
896 by the POSIX.1b Realtime Extension</para>
897 <indexterm zone="ch-system-glibc librt">
898 <primary sortas="c-librt">librt</primary>
899 </indexterm>
900 </listitem>
901 </varlistentry>
902
903 <varlistentry id="libthread_db">
904 <term><filename class="libraryfile">libthread_db</filename></term>
905 <listitem>
906 <para>Contains functions useful for building debuggers for
907 multi-threaded programs</para>
908 <indexterm zone="ch-system-glibc libthread_db">
909 <primary sortas="c-libthread_db">libthread_db</primary>
910 </indexterm>
911 </listitem>
912 </varlistentry>
913
914 <varlistentry id="libutil">
915 <term><filename class="libraryfile">libutil</filename></term>
916 <listitem>
917 <para>Contains code for <quote>standard</quote> functions used in
918 many different Unix utilities</para>
919 <indexterm zone="ch-system-glibc libutil">
920 <primary sortas="c-libutil">libutil</primary>
921 </indexterm>
922 </listitem>
923 </varlistentry>
924
925 </variablelist>
926
927 </sect2>
928
929</sect1>
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