source: chapter06/glibc.xml@ 251a06a

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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>nptl/tst-clock2</emphasis>,
121 <emphasis>nptl/tst-attr3</emphasis>,
122 <emphasis>tst/tst-cputimer1</emphasis>, and
123 <emphasis>rt/tst-cpuclock2</emphasis>
124 tests have been known to fail. The
125 reason is not completely understood, but indications are that minor
126 timing issues can trigger these failures.</para>
127 </listitem>
128
129 <listitem>
130 <para>The math tests sometimes fail when running on
131 systems where the CPU is not a relatively new genuine Intel or
132 authentic AMD processor.</para>
133 </listitem>
134
135 <listitem>
136 <para>When running on older and slower hardware or on systems under
137 load, some tests can fail because of test timeouts being exceeded.
138 Modifying the make check command to set a TIMEOUTFACTOR is reported to
139 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
140 make -k check</command>).</para>
141 </listitem>
142-->
143 <listitem>
144 <para>posix/tst-getaddrinfo4 will always fail due to not having a network
145 connection when the test is run.</para>
146 </listitem>
147<!--
148 <listitem>
149 <para>libio/tst-ftell-partial-wide.out fails because it needs a locale
150 that has not yet been generated.</para>
151 </listitem>
152
153 <listitem>
154 <para>Other tests known to fail on some architectures are posix/bug-regex32,
155 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, nptl/tst-robust8,
156 and stdio-common/bug22.</para>
157 </listitem>
158-->
159 </itemizedlist>
160
161 <para>Though it is a harmless message, the install stage of Glibc will
162 complain about the absence of <filename>/etc/ld.so.conf</filename>.
163 Prevent this warning with:</para>
164
165<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
166
167 <para>Install the package:</para>
168
169<screen><userinput remap="install">make install</userinput></screen>
170
171 <para>Install the configuration file and runtime directory for
172 <command>nscd</command>:</para>
173
174<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
175mkdir -pv /var/cache/nscd</userinput></screen>
176
177 <para>Install the systemd support files for <command>nscd</command>:</para>
178
179<screen><userinput remap="install">install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
180install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
181
182 <para>The locales that can make the system respond in a different language
183 were not installed by the above command. None of the locales are required,
184 but if some of them are missing, test suites of the future packages would
185 skip important testcases.</para>
186
187 <para>Individual locales can be installed using the
188 <command>localedef</command> program. E.g., the first
189 <command>localedef</command> command below combines the
190 <filename>/usr/share/i18n/locales/cs_CZ</filename>
191 charset-independent locale definition with the
192 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
193 charmap definition and appends the result to the
194 <filename>/usr/lib/locale/locale-archive</filename> file.
195 The following instructions will install the minimum set of
196 locales necessary for the optimal coverage of tests:</para>
197
198<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
199localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
200localedef -i de_DE -f ISO-8859-1 de_DE
201localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
202localedef -i de_DE -f UTF-8 de_DE.UTF-8
203localedef -i en_GB -f UTF-8 en_GB.UTF-8
204localedef -i en_HK -f ISO-8859-1 en_HK
205localedef -i en_PH -f ISO-8859-1 en_PH
206localedef -i en_US -f ISO-8859-1 en_US
207localedef -i en_US -f UTF-8 en_US.UTF-8
208localedef -i es_MX -f ISO-8859-1 es_MX
209localedef -i fa_IR -f UTF-8 fa_IR
210localedef -i fr_FR -f ISO-8859-1 fr_FR
211localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
212localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
213localedef -i it_IT -f ISO-8859-1 it_IT
214localedef -i it_IT -f UTF-8 it_IT.UTF-8
215localedef -i ja_JP -f EUC-JP ja_JP
216localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
217localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
218localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
219localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
220
221 <para>In addition, install the locale for your own country, language and
222 character set.</para>
223
224 <para>Alternatively, install all locales listed in the
225 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
226 (it includes every locale listed above and many more) at once with the
227 following time-consuming command:</para>
228
229<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
230
231 <para>Then use the <command>localedef</command> command to create and
232 install locales not listed in the
233 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
234 in the unlikely case you need them.</para>
235
236 </sect2>
237
238 <sect2 id="conf-glibc" role="configuration">
239 <title>Configuring Glibc</title>
240
241 <indexterm zone="conf-glibc">
242 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
243 </indexterm>
244
245 <indexterm zone="conf-glibc">
246 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
247 </indexterm>
248
249 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
250 because, although Glibc provides defaults when this file is missing or corrupt,
251 the Glibc defaults do not work well in a networked environment. The time zone
252 also needs to be configured.</para>
253
254 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
255 following:</para>
256
257<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
258<literal># Begin /etc/nsswitch.conf
259
260passwd: files
261group: files
262shadow: files
263
264hosts: files dns myhostname
265networks: files
266
267protocols: files
268services: files
269ethers: files
270rpc: files
271
272# End /etc/nsswitch.conf</literal>
273EOF</userinput></screen>
274
275 <para>Install timezone data:</para>
276<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
277
278ZONEINFO=/usr/share/zoneinfo
279mkdir -pv $ZONEINFO/{posix,right}
280
281for tz in etcetera southamerica northamerica europe africa antarctica \
282 asia australasia backward pacificnew systemv; do
283 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
284 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
285 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
286done
287
288cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
289zic -d $ZONEINFO -p America/New_York
290unset ZONEINFO</userinput></screen>
291
292 <variablelist>
293 <title>The meaning of the zic commands:</title>
294
295 <varlistentry>
296 <term><parameter>zic -L /dev/null ...</parameter></term>
297 <listitem>
298 <para>This creates posix timezones, without any leap seconds. It is
299 conventional to put these in both
300 <filename class="directory">zoneinfo</filename> and
301 <filename class="directory">zoneinfo/posix</filename>. It is
302 necessary to put the POSIX timezones in
303 <filename class="directory">zoneinfo</filename>, otherwise various
304 test-suites will report errors. On an embedded system, where space is
305 tight and you do not intend to ever update the timezones, you could save
306 1.9MB by not using the <filename class="directory">posix</filename>
307 directory, but some applications or test-suites might give less good
308 results</para>
309 </listitem>
310 </varlistentry>
311 <varlistentry>
312 <term><parameter>zic -L leapseconds ...</parameter></term>
313 <listitem>
314 <para>This creates right timezones, including leap seconds. On an
315 embedded system, where space is tight and you do not intend to
316 ever update the timezones, or care about the correct time, you could
317 save 1.9MB by omitting the <filename class="directory">right</filename>
318 directory.</para>
319 </listitem>
320 </varlistentry>
321 <varlistentry>
322 <term><parameter>zic ... -p ...</parameter></term>
323 <listitem>
324 <para>This creates the <filename>posixrules</filename> file. We use
325 New York because POSIX requires the daylight savings time rules
326 to be in accordance with US rules.</para>
327 </listitem>
328 </varlistentry>
329 </variablelist>
330
331
332 <para>One way to determine the local time zone is to run the following
333 script:</para>
334
335<screen role="nodump"><userinput>tzselect</userinput></screen>
336
337 <para>After answering a few questions about the location, the script will
338 output the name of the time zone (e.g.,
339 <emphasis>America/Edmonton</emphasis>). There are also some other possible
340 timezones listed in <filename
341 class='directory'>/usr/share/zoneinfo</filename> such as
342 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
343 are not identified by the script but can be used.</para>
344
345 <para>Then create the <filename>/etc/localtime</filename> file by
346 running:</para>
347
348<screen><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
349
350 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
351 time zone selected (e.g., Canada/Eastern).</para>
352
353 </sect2>
354
355 <sect2 id="conf-ld" role="configuration">
356 <title>Configuring the Dynamic Loader</title>
357
358 <indexterm zone="conf-ld">
359 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
360 </indexterm>
361
362 <para>By default, the dynamic loader (<filename
363 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
364 <filename class="directory">/lib</filename> and <filename
365 class="directory">/usr/lib</filename> for dynamic libraries that are
366 needed by programs as they are run. However, if there are libraries in
367 directories other than <filename class="directory">/lib</filename> and
368 <filename class="directory">/usr/lib</filename>, these need to be added
369 to the <filename>/etc/ld.so.conf</filename> file in order for the
370 dynamic loader to find them. Two directories that are commonly known
371 to contain additional libraries are <filename
372 class="directory">/usr/local/lib</filename> and <filename
373 class="directory">/opt/lib</filename>, so add those directories to the
374 dynamic loader's search path.</para>
375
376 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
377 following:</para>
378
379<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
380<literal># Begin /etc/ld.so.conf
381/usr/local/lib
382/opt/lib
383</literal>
384EOF</userinput></screen>
385
386 <para>If desired, the dynamic loader can also search a directory and
387 include the contents of files found there. Generally the files in
388 this include directory are one line specifying the desired library path.
389 To add this capability run the following commands:</para>
390
391<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
392<literal># Add an include directory
393include /etc/ld.so.conf.d/*.conf
394</literal>
395EOF
396mkdir -pv /etc/ld.so.conf.d</userinput></screen>
397
398 </sect2>
399
400 <sect2 id="contents-glibc" role="content">
401 <title>Contents of Glibc</title>
402
403 <segmentedlist>
404 <segtitle>Installed programs</segtitle>
405 <segtitle>Installed libraries</segtitle>
406 <segtitle>Installed directories</segtitle>
407
408 <seglistitem>
409 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
410 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
411 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
412 zdump, and zic</seg>
413 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
414 libc.{a,so}, libc_nonshared.a, libcidn.so,
415 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
416 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
417 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
418 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
419 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
420 libthread_db.so, and libutil.{a,so}</seg>
421 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
422 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
423 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
424 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
425 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
426 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
427 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
428 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
429 /var/cache/nscd, and /var/lib/nss_db</seg>
430 </seglistitem>
431 </segmentedlist>
432
433 <variablelist>
434 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
435 <?dbfo list-presentation="list"?>
436 <?dbhtml list-presentation="table"?>
437
438 <varlistentry id="catchsegv">
439 <term><command>catchsegv</command></term>
440 <listitem>
441 <para>Can be used to create a stack trace when a program
442 terminates with a segmentation fault</para>
443 <indexterm zone="ch-system-glibc catchsegv">
444 <primary sortas="b-catchsegv">catchsegv</primary>
445 </indexterm>
446 </listitem>
447 </varlistentry>
448
449 <varlistentry id="gencat">
450 <term><command>gencat</command></term>
451 <listitem>
452 <para>Generates message catalogues</para>
453 <indexterm zone="ch-system-glibc gencat">
454 <primary sortas="b-gencat">gencat</primary>
455 </indexterm>
456 </listitem>
457 </varlistentry>
458
459 <varlistentry id="getconf">
460 <term><command>getconf</command></term>
461 <listitem>
462 <para>Displays the system configuration values for file system
463 specific variables</para>
464 <indexterm zone="ch-system-glibc getconf">
465 <primary sortas="b-getconf">getconf</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="getent">
471 <term><command>getent</command></term>
472 <listitem>
473 <para>Gets entries from an administrative database</para>
474 <indexterm zone="ch-system-glibc getent">
475 <primary sortas="b-getent">getent</primary>
476 </indexterm>
477 </listitem>
478 </varlistentry>
479
480 <varlistentry id="iconv">
481 <term><command>iconv</command></term>
482 <listitem>
483 <para>Performs character set conversion</para>
484 <indexterm zone="ch-system-glibc iconv">
485 <primary sortas="b-iconv">iconv</primary>
486 </indexterm>
487 </listitem>
488 </varlistentry>
489
490 <varlistentry id="iconvconfig">
491 <term><command>iconvconfig</command></term>
492 <listitem>
493 <para>Creates fastloading <command>iconv</command> module configuration
494 files</para>
495 <indexterm zone="ch-system-glibc iconvconfig">
496 <primary sortas="b-iconvconfig">iconvconfig</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="ldconfig">
502 <term><command>ldconfig</command></term>
503 <listitem>
504 <para>Configures the dynamic linker runtime bindings</para>
505 <indexterm zone="ch-system-glibc ldconfig">
506 <primary sortas="b-ldconfig">ldconfig</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="ldd">
512 <term><command>ldd</command></term>
513 <listitem>
514 <para>Reports which shared libraries are required
515 by each given program or shared library</para>
516 <indexterm zone="ch-system-glibc ldd">
517 <primary sortas="b-ldd">ldd</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="lddlibc4">
523 <term><command>lddlibc4</command></term>
524 <listitem>
525 <para>Assists <command>ldd</command> with object files</para>
526 <indexterm zone="ch-system-glibc lddlibc4">
527 <primary sortas="b-lddlibc4">lddlibc4</primary>
528 </indexterm>
529 </listitem>
530 </varlistentry>
531
532 <varlistentry id="locale">
533 <term><command>locale</command></term>
534 <listitem>
535 <para>Prints various information about the current locale</para>
536 <indexterm zone="ch-system-glibc locale">
537 <primary sortas="b-locale">locale</primary>
538 </indexterm>
539 </listitem>
540 </varlistentry>
541
542 <varlistentry id="localedef">
543 <term><command>localedef</command></term>
544 <listitem>
545 <para>Compiles locale specifications</para>
546 <indexterm zone="ch-system-glibc localedef">
547 <primary sortas="b-localedef">localedef</primary>
548 </indexterm>
549 </listitem>
550 </varlistentry>
551
552 <varlistentry id="makedb">
553 <term><command>makedb</command></term>
554 <listitem>
555 <para>Creates a simple database from textual input</para>
556 <indexterm zone="ch-system-glibc makedb">
557 <primary sortas="b-makedb">makedb</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="mtrace">
563 <term><command>mtrace</command></term>
564 <listitem>
565 <para>Reads and interprets a memory trace file and displays a summary
566 in human-readable format</para>
567 <indexterm zone="ch-system-glibc mtrace">
568 <primary sortas="b-mtrace">mtrace</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="nscd">
574 <term><command>nscd</command></term>
575 <listitem>
576 <para>A daemon that provides a cache for the most common name
577 service requests</para>
578 <indexterm zone="ch-system-glibc nscd">
579 <primary sortas="b-nscd">nscd</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="pcprofiledump">
585 <term><command>pcprofiledump</command></term>
586 <listitem>
587 <para>Dumps information generated by PC profiling</para>
588 <indexterm zone="ch-system-glibc pcprofiledump">
589 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
590 </indexterm>
591 </listitem>
592 </varlistentry>
593
594 <varlistentry id="pldd">
595 <term><command>pldd</command></term>
596 <listitem>
597 <para>Lists dynamic shared objects used by running processes</para>
598 <indexterm zone="ch-system-glibc pldd">
599 <primary sortas="b-pldd">pldd</primary>
600 </indexterm>
601 </listitem>
602 </varlistentry>
603<!--
604 <varlistentry id="pt_chown">
605 <term><command>pt_chown</command></term>
606 <listitem>
607 <para>A helper program for <command>grantpt</command> to set the owner,
608 group and access permissions of a slave pseudo terminal</para>
609 <indexterm zone="ch-system-glibc pt_chown">
610 <primary sortas="b-pt_chown">pt_chown</primary>
611 </indexterm>
612 </listitem>
613 </varlistentry>
614-->
615 <varlistentry id="rpcgen">
616 <term><command>rpcgen</command></term>
617 <listitem>
618 <para>Generates C code to implement the Remote Procedure Call (RPC)
619 protocol</para>
620 <indexterm zone="ch-system-glibc rpcgen">
621 <primary sortas="b-rpcgen">rpcgen</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625
626 <varlistentry id="sln">
627 <term><command>sln</command></term>
628 <listitem>
629 <para>A statically linked <command>ln</command> program</para>
630 <indexterm zone="ch-system-glibc sln">
631 <primary sortas="b-sln">sln</primary>
632 </indexterm>
633 </listitem>
634 </varlistentry>
635
636 <varlistentry id="sotruss">
637 <term><command>sotruss</command></term>
638 <listitem>
639 <para>Traces shared library procedure calls of a specified command</para>
640 <indexterm zone="ch-system-glibc sotruss">
641 <primary sortas="b-sotruss">sotruss</primary>
642 </indexterm>
643 </listitem>
644 </varlistentry>
645
646 <varlistentry id="sprof">
647 <term><command>sprof</command></term>
648 <listitem>
649 <para>Reads and displays shared object profiling data</para>
650 <indexterm zone="ch-system-glibc sprof">
651 <primary sortas="b-sprof">sprof</primary>
652 </indexterm>
653 </listitem>
654 </varlistentry>
655
656 <varlistentry id="tzselect">
657 <term><command>tzselect</command></term>
658 <listitem>
659 <para>Asks the user about the location of the system and reports
660 the corresponding time zone description</para>
661 <indexterm zone="ch-system-glibc tzselect">
662 <primary sortas="b-tzselect">tzselect</primary>
663 </indexterm>
664 </listitem>
665 </varlistentry>
666
667 <varlistentry id="xtrace">
668 <term><command>xtrace</command></term>
669 <listitem>
670 <para>Traces the execution of a program by printing the currently
671 executed function</para>
672 <indexterm zone="ch-system-glibc xtrace">
673 <primary sortas="b-xtrace">xtrace</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="zdump">
679 <term><command>zdump</command></term>
680 <listitem>
681 <para>The time zone dumper</para>
682 <indexterm zone="ch-system-glibc zdump">
683 <primary sortas="b-zdump">zdump</primary>
684 </indexterm>
685 </listitem>
686 </varlistentry>
687
688 <varlistentry id="zic">
689 <term><command>zic</command></term>
690 <listitem>
691 <para>The time zone compiler</para>
692 <indexterm zone="ch-system-glibc zic">
693 <primary sortas="b-zic">zic</primary>
694 </indexterm>
695 </listitem>
696 </varlistentry>
697
698 <varlistentry id="ld.so">
699 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
700 <listitem>
701 <para>The helper program for shared library executables</para>
702 <indexterm zone="ch-system-glibc ld.so">
703 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
704 </indexterm>
705 </listitem>
706 </varlistentry>
707
708 <varlistentry id="libBrokenLocale">
709 <term><filename class="libraryfile">libBrokenLocale</filename></term>
710 <listitem>
711 <para>Used internally by Glibc as a gross hack to get broken programs
712 (e.g., some Motif applications) running. See comments in
713 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
714 for more information</para>
715 <indexterm zone="ch-system-glibc libBrokenLocale">
716 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
717 </indexterm>
718 </listitem>
719 </varlistentry>
720
721 <varlistentry id="libSegFault">
722 <term><filename class="libraryfile">libSegFault</filename></term>
723 <listitem>
724 <para>The segmentation fault signal handler, used by
725 <command>catchsegv</command></para>
726 <indexterm zone="ch-system-glibc libSegFault">
727 <primary sortas="c-libSegFault">libSegFault</primary>
728 </indexterm>
729 </listitem>
730 </varlistentry>
731
732 <varlistentry id="libanl">
733 <term><filename class="libraryfile">libanl</filename></term>
734 <listitem>
735 <para>An asynchronous name lookup library</para>
736 <indexterm zone="ch-system-glibc libanl">
737 <primary sortas="c-libanl">libanl</primary>
738 </indexterm>
739 </listitem>
740 </varlistentry>
741
742 <varlistentry id="libc">
743 <term><filename class="libraryfile">libc</filename></term>
744 <listitem>
745 <para>The main C library</para>
746 <indexterm zone="ch-system-glibc libc">
747 <primary sortas="c-libc">libc</primary>
748 </indexterm>
749 </listitem>
750 </varlistentry>
751
752 <varlistentry id="libcidn">
753 <term><filename class="libraryfile">libcidn</filename></term>
754 <listitem>
755 <para>Used internally by Glibc for handling internationalized domain
756 names in the <function>getaddrinfo()</function> function</para>
757 <indexterm zone="ch-system-glibc libcidn">
758 <primary sortas="c-libcidn">libcidn</primary>
759 </indexterm>
760 </listitem>
761 </varlistentry>
762
763 <varlistentry id="libcrypt">
764 <term><filename class="libraryfile">libcrypt</filename></term>
765 <listitem>
766 <para>The cryptography library</para>
767 <indexterm zone="ch-system-glibc libcrypt">
768 <primary sortas="c-libcrypt">libcrypt</primary>
769 </indexterm>
770 </listitem>
771 </varlistentry>
772
773 <varlistentry id="libdl">
774 <term><filename class="libraryfile">libdl</filename></term>
775 <listitem>
776 <para>The dynamic linking interface library</para>
777 <indexterm zone="ch-system-glibc libdl">
778 <primary sortas="c-libdl">libdl</primary>
779 </indexterm>
780 </listitem>
781 </varlistentry>
782
783 <varlistentry id="libg">
784 <term><filename class="libraryfile">libg</filename></term>
785 <listitem>
786 <para>Dummy library containing no functions. Previously was a runtime
787 library for <command>g++</command></para>
788 <indexterm zone="ch-system-glibc libg">
789 <primary sortas="c-libg">libg</primary>
790 </indexterm>
791 </listitem>
792 </varlistentry>
793
794 <varlistentry id="libieee">
795 <term><filename class="libraryfile">libieee</filename></term>
796 <listitem>
797 <para>Linking in this module forces error handling rules for math
798 functions as defined by the Institute of Electrical and Electronic
799 Engineers (IEEE). The default is POSIX.1 error handling</para>
800 <indexterm zone="ch-system-glibc libieee">
801 <primary sortas="c-libieee">libieee</primary>
802 </indexterm>
803 </listitem>
804 </varlistentry>
805
806 <varlistentry id="libm">
807 <term><filename class="libraryfile">libm</filename></term>
808 <listitem>
809 <para>The mathematical library</para>
810 <indexterm zone="ch-system-glibc libm">
811 <primary sortas="c-libm">libm</primary>
812 </indexterm>
813 </listitem>
814 </varlistentry>
815
816 <varlistentry id="libmcheck">
817 <term><filename class="libraryfile">libmcheck</filename></term>
818 <listitem>
819 <para>Turns on memory allocation checking when linked to</para>
820 <indexterm zone="ch-system-glibc libmcheck">
821 <primary sortas="c-libmcheck">libmcheck</primary>
822 </indexterm>
823 </listitem>
824 </varlistentry>
825
826 <varlistentry id="libmemusage">
827 <term><filename class="libraryfile">libmemusage</filename></term>
828 <listitem>
829 <para>Used by <command>memusage</command> to help collect
830 information about the memory usage of a program</para>
831 <indexterm zone="ch-system-glibc libmemusage">
832 <primary sortas="c-libmemusage">libmemusage</primary>
833 </indexterm>
834 </listitem>
835 </varlistentry>
836
837 <varlistentry id="libnsl">
838 <term><filename class="libraryfile">libnsl</filename></term>
839 <listitem>
840 <para>The network services library</para>
841 <indexterm zone="ch-system-glibc libnsl">
842 <primary sortas="c-libnsl">libnsl</primary>
843 </indexterm>
844 </listitem>
845 </varlistentry>
846
847 <varlistentry id="libnss">
848 <term><filename class="libraryfile">libnss</filename></term>
849 <listitem>
850 <para>The Name Service Switch libraries, containing functions for
851 resolving host names, user names, group names, aliases, services,
852 protocols, etc.</para>
853 <indexterm zone="ch-system-glibc libnss">
854 <primary sortas="c-libnss">libnss</primary>
855 </indexterm>
856 </listitem>
857 </varlistentry>
858
859 <varlistentry id="libpcprofile">
860 <term><filename class="libraryfile">libpcprofile</filename></term>
861 <listitem>
862 <para>Contains profiling functions used to track the amount of CPU
863 time spent in specific source code lines</para>
864 <indexterm zone="ch-system-glibc libpcprofile">
865 <primary sortas="c-libpcprofile">libpcprofile</primary>
866 </indexterm>
867 </listitem>
868 </varlistentry>
869
870 <varlistentry id="libpthread">
871 <term><filename class="libraryfile">libpthread</filename></term>
872 <listitem>
873 <para>The POSIX threads library</para>
874 <indexterm zone="ch-system-glibc libpthread">
875 <primary sortas="c-libpthread">libpthread</primary>
876 </indexterm>
877 </listitem>
878 </varlistentry>
879
880 <varlistentry id="libresolv">
881 <term><filename class="libraryfile">libresolv</filename></term>
882 <listitem>
883 <para>Contains functions for creating, sending, and interpreting
884 packets to the Internet domain name servers</para>
885 <indexterm zone="ch-system-glibc libresolv">
886 <primary sortas="c-libresolv">libresolv</primary>
887 </indexterm>
888 </listitem>
889 </varlistentry>
890
891 <varlistentry id="librpcsvc">
892 <term><filename class="libraryfile">librpcsvc</filename></term>
893 <listitem>
894 <para>Contains functions providing miscellaneous RPC services</para>
895 <indexterm zone="ch-system-glibc librpcsvc">
896 <primary sortas="c-librpcsvc">librpcsvc</primary>
897 </indexterm>
898 </listitem>
899 </varlistentry>
900
901 <varlistentry id="librt">
902 <term><filename class="libraryfile">librt</filename></term>
903 <listitem>
904 <para>Contains functions providing most of the interfaces specified
905 by the POSIX.1b Realtime Extension</para>
906 <indexterm zone="ch-system-glibc librt">
907 <primary sortas="c-librt">librt</primary>
908 </indexterm>
909 </listitem>
910 </varlistentry>
911
912 <varlistentry id="libthread_db">
913 <term><filename class="libraryfile">libthread_db</filename></term>
914 <listitem>
915 <para>Contains functions useful for building debuggers for
916 multi-threaded programs</para>
917 <indexterm zone="ch-system-glibc libthread_db">
918 <primary sortas="c-libthread_db">libthread_db</primary>
919 </indexterm>
920 </listitem>
921 </varlistentry>
922
923 <varlistentry id="libutil">
924 <term><filename class="libraryfile">libutil</filename></term>
925 <listitem>
926 <para>Contains code for <quote>standard</quote> functions used in
927 many different Unix utilities</para>
928 <indexterm zone="ch-system-glibc libutil">
929 <primary sortas="c-libutil">libutil</primary>
930 </indexterm>
931 </listitem>
932 </varlistentry>
933
934 </variablelist>
935
936 </sect2>
937
938</sect1>
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