source: chapter06/glibc.xml@ 195eda5

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Commit chapter06 changes for glibc.

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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 -k check</userinput></screen>
112
113 <para><!--You will probably see an expected (ignored) failure in the
114 <emphasis>posix/annexc</emphasis> and
115 <emphasis>conform/run-conformtest</emphasis> tests. In addition t-->The Glibc
116 test suite is somewhat dependent on the host system. This is a list of the
117 most common issues:</para>
118
119 <itemizedlist>
120
121 <listitem>
122 <para>The <emphasis>nptl/tst-clock2</emphasis>,
123 <emphasis>nptl/tst-attr3</emphasis>,
124 <emphasis>tst/tst-cputimer1</emphasis>, and
125 <emphasis>rt/tst-cpuclock2</emphasis>
126 tests have been known to fail. The
127 reason is not completely understood, but indications are that minor
128 timing issues can trigger these failures.</para>
129 </listitem>
130
131 <listitem>
132 <para>The math tests sometimes fail when running on
133 systems where the CPU is not a relatively new genuine Intel or
134 authentic AMD processor.</para>
135 </listitem>
136
137 <listitem>
138 <para>When running on older and slower hardware or on systems under
139 load, some tests can fail because of test timeouts being exceeded.
140 Modifying the make check command to set a TIMEOUTFACTOR is reported to
141 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
142 make -k check</command>).</para>
143 </listitem>
144
145 <listitem>
146 <para>posix/tst-getaddrinfo4 will always fail due to not having a network
147 connection when the test is run.</para>
148 </listitem>
149
150 <listitem>
151 <para>libio/tst-ftell-partial-wide.out fails because it needs a locale
152 that has not yet been generated.</para>
153 </listitem>
154
155 <listitem>
156 <para>Other tests known to fail on some architectures are posix/bug-regex32,
157 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, nptl/tst-robust8,
158 and stdio-common/bug22.</para>
159 </listitem>
160
161 </itemizedlist>
162
163 <para>Though it is a harmless message, the install stage of Glibc will
164 complain about the absence of <filename>/etc/ld.so.conf</filename>.
165 Prevent this warning with:</para>
166
167<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
168
169 <para>Install the package:</para>
170
171<screen><userinput remap="install">make install</userinput></screen>
172
173 <para>Install the configuration file and runtime directory for
174 <command>nscd</command>:</para>
175
176<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
177mkdir -pv /var/cache/nscd</userinput></screen>
178
179 <para>Install the systemd support files for <command>nscd</command>:</para>
180
181<screen><userinput remap="install">install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
182install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
183
184 <para>The locales that can make the system respond in a different language
185 were not installed by the above command. None of the locales are required,
186 but if some of them are missing, test suites of the future packages would
187 skip important testcases.</para>
188
189 <para>Individual locales can be installed using the
190 <command>localedef</command> program. E.g., the first
191 <command>localedef</command> command below combines the
192 <filename>/usr/share/i18n/locales/cs_CZ</filename>
193 charset-independent locale definition with the
194 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
195 charmap definition and appends the result to the
196 <filename>/usr/lib/locale/locale-archive</filename> file.
197 The following instructions will install the minimum set of
198 locales necessary for the optimal coverage of tests:</para>
199
200<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
201localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
202localedef -i de_DE -f ISO-8859-1 de_DE
203localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
204localedef -i de_DE -f UTF-8 de_DE.UTF-8
205localedef -i en_GB -f UTF-8 en_GB.UTF-8
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 it_IT -f UTF-8 it_IT.UTF-8
217localedef -i ja_JP -f EUC-JP ja_JP
218localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
219localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
220localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
221localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
222
223 <para>In addition, install the locale for your own country, language and
224 character set.</para>
225
226 <para>Alternatively, install all locales listed in the
227 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
228 (it includes every locale listed above and many more) at once with the
229 following time-consuming command:</para>
230
231<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
232
233 <para>Then use the <command>localedef</command> command to create and
234 install locales not listed in the
235 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
236 in the unlikely case you need them.</para>
237
238 </sect2>
239
240 <sect2 id="conf-glibc" role="configuration">
241 <title>Configuring Glibc</title>
242
243 <indexterm zone="conf-glibc">
244 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
245 </indexterm>
246
247 <indexterm zone="conf-glibc">
248 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
249 </indexterm>
250
251 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
252 because, although Glibc provides defaults when this file is missing or corrupt,
253 the Glibc defaults do not work well in a networked environment. The time zone
254 also needs to be configured.</para>
255
256 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
257 following:</para>
258
259<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
260<literal># Begin /etc/nsswitch.conf
261
262passwd: files
263group: files
264shadow: files
265
266hosts: files dns myhostname
267networks: files
268
269protocols: files
270services: files
271ethers: files
272rpc: files
273
274# End /etc/nsswitch.conf</literal>
275EOF</userinput></screen>
276
277 <para>Install timezone data:</para>
278<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
279
280ZONEINFO=/usr/share/zoneinfo
281mkdir -pv $ZONEINFO/{posix,right}
282
283for tz in etcetera southamerica northamerica europe africa antarctica \
284 asia australasia backward pacificnew systemv; do
285 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
286 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
287 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
288done
289
290cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
291zic -d $ZONEINFO -p America/New_York
292unset ZONEINFO</userinput></screen>
293
294 <variablelist>
295 <title>The meaning of the zic commands:</title>
296
297 <varlistentry>
298 <term><parameter>zic -L /dev/null ...</parameter></term>
299 <listitem>
300 <para>This creates posix timezones, without any leap seconds. It is
301 conventional to put these in both
302 <filename class="directory">zoneinfo</filename> and
303 <filename class="directory">zoneinfo/posix</filename>. It is
304 necessary to put the POSIX timezones in
305 <filename class="directory">zoneinfo</filename>, otherwise various
306 test-suites will report errors. On an embedded system, where space is
307 tight and you do not intend to ever update the timezones, you could save
308 1.9MB by not using the <filename class="directory">posix</filename>
309 directory, but some applications or test-suites might give less good
310 results</para>
311 </listitem>
312 </varlistentry>
313 <varlistentry>
314 <term><parameter>zic -L leapseconds ...</parameter></term>
315 <listitem>
316 <para>This creates right timezones, including leap seconds. On an
317 embedded system, where space is tight and you do not intend to
318 ever update the timezones, or care about the correct time, you could
319 save 1.9MB by omitting the <filename class="directory">right</filename>
320 directory.</para>
321 </listitem>
322 </varlistentry>
323 <varlistentry>
324 <term><parameter>zic ... -p ...</parameter></term>
325 <listitem>
326 <para>This creates the <filename>posixrules</filename> file. We use
327 New York because POSIX requires the daylight savings time rules
328 to be in accordance with US rules.</para>
329 </listitem>
330 </varlistentry>
331 </variablelist>
332
333
334 <para>One way to determine the local time zone is to run the following
335 script:</para>
336
337<screen role="nodump"><userinput>tzselect</userinput></screen>
338
339 <para>After answering a few questions about the location, the script will
340 output the name of the time zone (e.g.,
341 <emphasis>America/Edmonton</emphasis>). There are also some other possible
342 timezones listed in <filename
343 class='directory'>/usr/share/zoneinfo</filename> such as
344 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
345 are not identified by the script but can be used.</para>
346
347 <para>Then create the <filename>/etc/localtime</filename> file by
348 running:</para>
349
350<screen><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
351
352 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
353 time zone selected (e.g., Canada/Eastern).</para>
354
355 </sect2>
356
357 <sect2 id="conf-ld" role="configuration">
358 <title>Configuring the Dynamic Loader</title>
359
360 <indexterm zone="conf-ld">
361 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
362 </indexterm>
363
364 <para>By default, the dynamic loader (<filename
365 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
366 <filename class="directory">/lib</filename> and <filename
367 class="directory">/usr/lib</filename> for dynamic libraries that are
368 needed by programs as they are run. However, if there are libraries in
369 directories other than <filename class="directory">/lib</filename> and
370 <filename class="directory">/usr/lib</filename>, these need to be added
371 to the <filename>/etc/ld.so.conf</filename> file in order for the
372 dynamic loader to find them. Two directories that are commonly known
373 to contain additional libraries are <filename
374 class="directory">/usr/local/lib</filename> and <filename
375 class="directory">/opt/lib</filename>, so add those directories to the
376 dynamic loader's search path.</para>
377
378 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
379 following:</para>
380
381<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
382<literal># Begin /etc/ld.so.conf
383/usr/local/lib
384/opt/lib
385</literal>
386EOF</userinput></screen>
387
388 <para>If desired, the dynamic loader can also search a directory and
389 include the contents of files found there. Generally the files in
390 this include directory are one line specifying the desired library path.
391 To add this capability run the following commands:</para>
392
393<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
394<literal># Add an include directory
395include /etc/ld.so.conf.d/*.conf
396</literal>
397EOF
398mkdir -pv /etc/ld.so.conf.d</userinput></screen>
399
400 </sect2>
401
402 <sect2 id="contents-glibc" role="content">
403 <title>Contents of Glibc</title>
404
405 <segmentedlist>
406 <segtitle>Installed programs</segtitle>
407 <segtitle>Installed libraries</segtitle>
408 <segtitle>Installed directories</segtitle>
409
410 <seglistitem>
411 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
412 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
413 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
414 zdump, and zic</seg>
415 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
416 libc.{a,so}, libc_nonshared.a, libcidn.so,
417 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
418 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
419 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
420 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
421 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
422 libthread_db.so, and libutil.{a,so}</seg>
423 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
424 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
425 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
426 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
427 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
428 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
429 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
430 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
431 /var/cache/nscd, and /var/lib/nss_db</seg>
432 </seglistitem>
433 </segmentedlist>
434
435 <variablelist>
436 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
437 <?dbfo list-presentation="list"?>
438 <?dbhtml list-presentation="table"?>
439
440 <varlistentry id="catchsegv">
441 <term><command>catchsegv</command></term>
442 <listitem>
443 <para>Can be used to create a stack trace when a program
444 terminates with a segmentation fault</para>
445 <indexterm zone="ch-system-glibc catchsegv">
446 <primary sortas="b-catchsegv">catchsegv</primary>
447 </indexterm>
448 </listitem>
449 </varlistentry>
450
451 <varlistentry id="gencat">
452 <term><command>gencat</command></term>
453 <listitem>
454 <para>Generates message catalogues</para>
455 <indexterm zone="ch-system-glibc gencat">
456 <primary sortas="b-gencat">gencat</primary>
457 </indexterm>
458 </listitem>
459 </varlistentry>
460
461 <varlistentry id="getconf">
462 <term><command>getconf</command></term>
463 <listitem>
464 <para>Displays the system configuration values for file system
465 specific variables</para>
466 <indexterm zone="ch-system-glibc getconf">
467 <primary sortas="b-getconf">getconf</primary>
468 </indexterm>
469 </listitem>
470 </varlistentry>
471
472 <varlistentry id="getent">
473 <term><command>getent</command></term>
474 <listitem>
475 <para>Gets entries from an administrative database</para>
476 <indexterm zone="ch-system-glibc getent">
477 <primary sortas="b-getent">getent</primary>
478 </indexterm>
479 </listitem>
480 </varlistentry>
481
482 <varlistentry id="iconv">
483 <term><command>iconv</command></term>
484 <listitem>
485 <para>Performs character set conversion</para>
486 <indexterm zone="ch-system-glibc iconv">
487 <primary sortas="b-iconv">iconv</primary>
488 </indexterm>
489 </listitem>
490 </varlistentry>
491
492 <varlistentry id="iconvconfig">
493 <term><command>iconvconfig</command></term>
494 <listitem>
495 <para>Creates fastloading <command>iconv</command> module configuration
496 files</para>
497 <indexterm zone="ch-system-glibc iconvconfig">
498 <primary sortas="b-iconvconfig">iconvconfig</primary>
499 </indexterm>
500 </listitem>
501 </varlistentry>
502
503 <varlistentry id="ldconfig">
504 <term><command>ldconfig</command></term>
505 <listitem>
506 <para>Configures the dynamic linker runtime bindings</para>
507 <indexterm zone="ch-system-glibc ldconfig">
508 <primary sortas="b-ldconfig">ldconfig</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="ldd">
514 <term><command>ldd</command></term>
515 <listitem>
516 <para>Reports which shared libraries are required
517 by each given program or shared library</para>
518 <indexterm zone="ch-system-glibc ldd">
519 <primary sortas="b-ldd">ldd</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="lddlibc4">
525 <term><command>lddlibc4</command></term>
526 <listitem>
527 <para>Assists <command>ldd</command> with object files</para>
528 <indexterm zone="ch-system-glibc lddlibc4">
529 <primary sortas="b-lddlibc4">lddlibc4</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="locale">
535 <term><command>locale</command></term>
536 <listitem>
537 <para>Prints various information about the current locale</para>
538 <indexterm zone="ch-system-glibc locale">
539 <primary sortas="b-locale">locale</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="localedef">
545 <term><command>localedef</command></term>
546 <listitem>
547 <para>Compiles locale specifications</para>
548 <indexterm zone="ch-system-glibc localedef">
549 <primary sortas="b-localedef">localedef</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="makedb">
555 <term><command>makedb</command></term>
556 <listitem>
557 <para>Creates a simple database from textual input</para>
558 <indexterm zone="ch-system-glibc makedb">
559 <primary sortas="b-makedb">makedb</primary>
560 </indexterm>
561 </listitem>
562 </varlistentry>
563
564 <varlistentry id="mtrace">
565 <term><command>mtrace</command></term>
566 <listitem>
567 <para>Reads and interprets a memory trace file and displays a summary
568 in human-readable format</para>
569 <indexterm zone="ch-system-glibc mtrace">
570 <primary sortas="b-mtrace">mtrace</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="nscd">
576 <term><command>nscd</command></term>
577 <listitem>
578 <para>A daemon that provides a cache for the most common name
579 service requests</para>
580 <indexterm zone="ch-system-glibc nscd">
581 <primary sortas="b-nscd">nscd</primary>
582 </indexterm>
583 </listitem>
584 </varlistentry>
585
586 <varlistentry id="pcprofiledump">
587 <term><command>pcprofiledump</command></term>
588 <listitem>
589 <para>Dumps information generated by PC profiling</para>
590 <indexterm zone="ch-system-glibc pcprofiledump">
591 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
592 </indexterm>
593 </listitem>
594 </varlistentry>
595
596 <varlistentry id="pldd">
597 <term><command>pldd</command></term>
598 <listitem>
599 <para>Lists dynamic shared objects used by running processes</para>
600 <indexterm zone="ch-system-glibc pldd">
601 <primary sortas="b-pldd">pldd</primary>
602 </indexterm>
603 </listitem>
604 </varlistentry>
605<!--
606 <varlistentry id="pt_chown">
607 <term><command>pt_chown</command></term>
608 <listitem>
609 <para>A helper program for <command>grantpt</command> to set the owner,
610 group and access permissions of a slave pseudo terminal</para>
611 <indexterm zone="ch-system-glibc pt_chown">
612 <primary sortas="b-pt_chown">pt_chown</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry>
616-->
617 <varlistentry id="rpcgen">
618 <term><command>rpcgen</command></term>
619 <listitem>
620 <para>Generates C code to implement the Remote Procedure Call (RPC)
621 protocol</para>
622 <indexterm zone="ch-system-glibc rpcgen">
623 <primary sortas="b-rpcgen">rpcgen</primary>
624 </indexterm>
625 </listitem>
626 </varlistentry>
627
628 <varlistentry id="sln">
629 <term><command>sln</command></term>
630 <listitem>
631 <para>A statically linked <command>ln</command> program</para>
632 <indexterm zone="ch-system-glibc sln">
633 <primary sortas="b-sln">sln</primary>
634 </indexterm>
635 </listitem>
636 </varlistentry>
637
638 <varlistentry id="sotruss">
639 <term><command>sotruss</command></term>
640 <listitem>
641 <para>Traces shared library procedure calls of a specified command</para>
642 <indexterm zone="ch-system-glibc sotruss">
643 <primary sortas="b-sotruss">sotruss</primary>
644 </indexterm>
645 </listitem>
646 </varlistentry>
647
648 <varlistentry id="sprof">
649 <term><command>sprof</command></term>
650 <listitem>
651 <para>Reads and displays shared object profiling data</para>
652 <indexterm zone="ch-system-glibc sprof">
653 <primary sortas="b-sprof">sprof</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry>
657
658 <varlistentry id="tzselect">
659 <term><command>tzselect</command></term>
660 <listitem>
661 <para>Asks the user about the location of the system and reports
662 the corresponding time zone description</para>
663 <indexterm zone="ch-system-glibc tzselect">
664 <primary sortas="b-tzselect">tzselect</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="xtrace">
670 <term><command>xtrace</command></term>
671 <listitem>
672 <para>Traces the execution of a program by printing the currently
673 executed function</para>
674 <indexterm zone="ch-system-glibc xtrace">
675 <primary sortas="b-xtrace">xtrace</primary>
676 </indexterm>
677 </listitem>
678 </varlistentry>
679
680 <varlistentry id="zdump">
681 <term><command>zdump</command></term>
682 <listitem>
683 <para>The time zone dumper</para>
684 <indexterm zone="ch-system-glibc zdump">
685 <primary sortas="b-zdump">zdump</primary>
686 </indexterm>
687 </listitem>
688 </varlistentry>
689
690 <varlistentry id="zic">
691 <term><command>zic</command></term>
692 <listitem>
693 <para>The time zone compiler</para>
694 <indexterm zone="ch-system-glibc zic">
695 <primary sortas="b-zic">zic</primary>
696 </indexterm>
697 </listitem>
698 </varlistentry>
699
700 <varlistentry id="ld.so">
701 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
702 <listitem>
703 <para>The helper program for shared library executables</para>
704 <indexterm zone="ch-system-glibc ld.so">
705 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
706 </indexterm>
707 </listitem>
708 </varlistentry>
709
710 <varlistentry id="libBrokenLocale">
711 <term><filename class="libraryfile">libBrokenLocale</filename></term>
712 <listitem>
713 <para>Used internally by Glibc as a gross hack to get broken programs
714 (e.g., some Motif applications) running. See comments in
715 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
716 for more information</para>
717 <indexterm zone="ch-system-glibc libBrokenLocale">
718 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
719 </indexterm>
720 </listitem>
721 </varlistentry>
722
723 <varlistentry id="libSegFault">
724 <term><filename class="libraryfile">libSegFault</filename></term>
725 <listitem>
726 <para>The segmentation fault signal handler, used by
727 <command>catchsegv</command></para>
728 <indexterm zone="ch-system-glibc libSegFault">
729 <primary sortas="c-libSegFault">libSegFault</primary>
730 </indexterm>
731 </listitem>
732 </varlistentry>
733
734 <varlistentry id="libanl">
735 <term><filename class="libraryfile">libanl</filename></term>
736 <listitem>
737 <para>An asynchronous name lookup library</para>
738 <indexterm zone="ch-system-glibc libanl">
739 <primary sortas="c-libanl">libanl</primary>
740 </indexterm>
741 </listitem>
742 </varlistentry>
743
744 <varlistentry id="libc">
745 <term><filename class="libraryfile">libc</filename></term>
746 <listitem>
747 <para>The main C library</para>
748 <indexterm zone="ch-system-glibc libc">
749 <primary sortas="c-libc">libc</primary>
750 </indexterm>
751 </listitem>
752 </varlistentry>
753
754 <varlistentry id="libcidn">
755 <term><filename class="libraryfile">libcidn</filename></term>
756 <listitem>
757 <para>Used internally by Glibc for handling internationalized domain
758 names in the <function>getaddrinfo()</function> function</para>
759 <indexterm zone="ch-system-glibc libcidn">
760 <primary sortas="c-libcidn">libcidn</primary>
761 </indexterm>
762 </listitem>
763 </varlistentry>
764
765 <varlistentry id="libcrypt">
766 <term><filename class="libraryfile">libcrypt</filename></term>
767 <listitem>
768 <para>The cryptography library</para>
769 <indexterm zone="ch-system-glibc libcrypt">
770 <primary sortas="c-libcrypt">libcrypt</primary>
771 </indexterm>
772 </listitem>
773 </varlistentry>
774
775 <varlistentry id="libdl">
776 <term><filename class="libraryfile">libdl</filename></term>
777 <listitem>
778 <para>The dynamic linking interface library</para>
779 <indexterm zone="ch-system-glibc libdl">
780 <primary sortas="c-libdl">libdl</primary>
781 </indexterm>
782 </listitem>
783 </varlistentry>
784
785 <varlistentry id="libg">
786 <term><filename class="libraryfile">libg</filename></term>
787 <listitem>
788 <para>Dummy library containing no functions. Previously was a runtime
789 library for <command>g++</command></para>
790 <indexterm zone="ch-system-glibc libg">
791 <primary sortas="c-libg">libg</primary>
792 </indexterm>
793 </listitem>
794 </varlistentry>
795
796 <varlistentry id="libieee">
797 <term><filename class="libraryfile">libieee</filename></term>
798 <listitem>
799 <para>Linking in this module forces error handling rules for math
800 functions as defined by the Institute of Electrical and Electronic
801 Engineers (IEEE). The default is POSIX.1 error handling</para>
802 <indexterm zone="ch-system-glibc libieee">
803 <primary sortas="c-libieee">libieee</primary>
804 </indexterm>
805 </listitem>
806 </varlistentry>
807
808 <varlistentry id="libm">
809 <term><filename class="libraryfile">libm</filename></term>
810 <listitem>
811 <para>The mathematical library</para>
812 <indexterm zone="ch-system-glibc libm">
813 <primary sortas="c-libm">libm</primary>
814 </indexterm>
815 </listitem>
816 </varlistentry>
817
818 <varlistentry id="libmcheck">
819 <term><filename class="libraryfile">libmcheck</filename></term>
820 <listitem>
821 <para>Turns on memory allocation checking when linked to</para>
822 <indexterm zone="ch-system-glibc libmcheck">
823 <primary sortas="c-libmcheck">libmcheck</primary>
824 </indexterm>
825 </listitem>
826 </varlistentry>
827
828 <varlistentry id="libmemusage">
829 <term><filename class="libraryfile">libmemusage</filename></term>
830 <listitem>
831 <para>Used by <command>memusage</command> to help collect
832 information about the memory usage of a program</para>
833 <indexterm zone="ch-system-glibc libmemusage">
834 <primary sortas="c-libmemusage">libmemusage</primary>
835 </indexterm>
836 </listitem>
837 </varlistentry>
838
839 <varlistentry id="libnsl">
840 <term><filename class="libraryfile">libnsl</filename></term>
841 <listitem>
842 <para>The network services library</para>
843 <indexterm zone="ch-system-glibc libnsl">
844 <primary sortas="c-libnsl">libnsl</primary>
845 </indexterm>
846 </listitem>
847 </varlistentry>
848
849 <varlistentry id="libnss">
850 <term><filename class="libraryfile">libnss</filename></term>
851 <listitem>
852 <para>The Name Service Switch libraries, containing functions for
853 resolving host names, user names, group names, aliases, services,
854 protocols, etc.</para>
855 <indexterm zone="ch-system-glibc libnss">
856 <primary sortas="c-libnss">libnss</primary>
857 </indexterm>
858 </listitem>
859 </varlistentry>
860
861 <varlistentry id="libpcprofile">
862 <term><filename class="libraryfile">libpcprofile</filename></term>
863 <listitem>
864 <para>Contains profiling functions used to track the amount of CPU
865 time spent in specific source code lines</para>
866 <indexterm zone="ch-system-glibc libpcprofile">
867 <primary sortas="c-libpcprofile">libpcprofile</primary>
868 </indexterm>
869 </listitem>
870 </varlistentry>
871
872 <varlistentry id="libpthread">
873 <term><filename class="libraryfile">libpthread</filename></term>
874 <listitem>
875 <para>The POSIX threads library</para>
876 <indexterm zone="ch-system-glibc libpthread">
877 <primary sortas="c-libpthread">libpthread</primary>
878 </indexterm>
879 </listitem>
880 </varlistentry>
881
882 <varlistentry id="libresolv">
883 <term><filename class="libraryfile">libresolv</filename></term>
884 <listitem>
885 <para>Contains functions for creating, sending, and interpreting
886 packets to the Internet domain name servers</para>
887 <indexterm zone="ch-system-glibc libresolv">
888 <primary sortas="c-libresolv">libresolv</primary>
889 </indexterm>
890 </listitem>
891 </varlistentry>
892
893 <varlistentry id="librpcsvc">
894 <term><filename class="libraryfile">librpcsvc</filename></term>
895 <listitem>
896 <para>Contains functions providing miscellaneous RPC services</para>
897 <indexterm zone="ch-system-glibc librpcsvc">
898 <primary sortas="c-librpcsvc">librpcsvc</primary>
899 </indexterm>
900 </listitem>
901 </varlistentry>
902
903 <varlistentry id="librt">
904 <term><filename class="libraryfile">librt</filename></term>
905 <listitem>
906 <para>Contains functions providing most of the interfaces specified
907 by the POSIX.1b Realtime Extension</para>
908 <indexterm zone="ch-system-glibc librt">
909 <primary sortas="c-librt">librt</primary>
910 </indexterm>
911 </listitem>
912 </varlistentry>
913
914 <varlistentry id="libthread_db">
915 <term><filename class="libraryfile">libthread_db</filename></term>
916 <listitem>
917 <para>Contains functions useful for building debuggers for
918 multi-threaded programs</para>
919 <indexterm zone="ch-system-glibc libthread_db">
920 <primary sortas="c-libthread_db">libthread_db</primary>
921 </indexterm>
922 </listitem>
923 </varlistentry>
924
925 <varlistentry id="libutil">
926 <term><filename class="libraryfile">libutil</filename></term>
927 <listitem>
928 <para>Contains code for <quote>standard</quote> functions used in
929 many different Unix utilities</para>
930 <indexterm zone="ch-system-glibc libutil">
931 <primary sortas="c-libutil">libutil</primary>
932 </indexterm>
933 </listitem>
934 </varlistentry>
935
936 </variablelist>
937
938 </sect2>
939
940</sect1>
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