source: chapter06/glibc.xml@ ac9c87b

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Last change on this file since ac9c87b was ac9c87b, checked in by Bruce Dubbs <bdubbs@…>, 4 years ago

Add an option to glibc to allow building of nfs packages.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11286 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-system-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Glibc package contains the main C library. This library provides
27 the basic routines for allocating memory, searching directories, opening and
28 closing files, reading and writing files, string handling, pattern matching,
29 arithmetic, and so on.</para>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-ch6-sbu;</seg>
37 <seg>&glibc-ch6-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <note><para>The Glibc build system is self-contained and will install
47 perfectly, even though the compiler specs file and linker are still
48 pointing to <filename class="directory">/tools</filename>. The specs
49 and linker cannot be adjusted before the Glibc install because the
50 Glibc autoconf tests would give false results and defeat the goal
51 of achieving a clean build.</para></note>
52
53 <para>Some of the Glibc programs use non-FHS compilant
54 <filename class="directory">/var/db</filename> directory to store
55 their runtime data. Apply the following patch to make such programs
56 store their runtime data in the FHS-compliant locations:</para>
57
58<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
59
60 <para>First create a compatibility symlink to avoid references to /tools in
61 our final glibc:</para>
62
63<screen><userinput remap="pre">ln -sfv /tools/lib/gcc /usr/lib</userinput></screen>
64
65 <para>Determine the GCC include directory and create a symlink for LSB
66 compliance. Additionally, for x86_64, create a compatibility symlink
67 required for the dynamic loader to function correctly:</para>
68
69<screen><userinput remap="pre">case $(uname -m) in
70 i?86) GCC_INCDIR=/usr/lib/gcc/$(uname -m)-pc-linux-gnu/&gcc-version;/include
71 ln -sfv ld-linux.so.2 /lib/ld-lsb.so.3
72 ;;
73 x86_64) GCC_INCDIR=/usr/lib/gcc/x86_64-pc-linux-gnu/&gcc-version;/include
74 ln -sfv ../lib/ld-linux-x86-64.so.2 /lib64
75 ln -sfv ../lib/ld-linux-x86-64.so.2 /lib64/ld-lsb-x86-64.so.3
76 ;;
77esac</userinput></screen>
78
79 <para>Remove a file that may be left over from a previous build attempt:
80 </para>
81
82<screen><userinput remap="pre">rm -f /usr/include/limits.h</userinput></screen>
83
84 <para>The Glibc documentation recommends building Glibc
85 in a dedicated build directory:</para>
86
87<screen><userinput remap="pre">mkdir -v build
88cd build</userinput></screen>
89
90 <para>Prepare Glibc for compilation:</para>
91
92<screen><userinput remap="configure">CC="gcc -isystem $GCC_INCDIR -isystem /usr/include" \
93../configure --prefix=/usr \
94 --disable-werror \
95 --enable-kernel=&min-kernel; \
96 --enable-obsolete-rpc \
97 --enable-obsolete-nsl \
98 --enable-stack-protector=strong \
99 libc_cv_slibdir=/lib
100unset GCC_INCDIR</userinput></screen>
101
102 <variablelist>
103 <title>The meaning of the options and new configure parameters:</title>
104
105 <varlistentry>
106 <term><parameter>CC="gcc -isystem $GCC_INCDIR -isystem /usr/include"</parameter></term>
107 <listitem>
108 <para>Setting the location of both gcc and system include directories
109 avoids introduction of invalid paths in debugging symbols.</para>
110 </listitem>
111 </varlistentry>
112
113 <varlistentry>
114 <term><parameter>--disable-werror</parameter></term>
115 <listitem>
116 <para>This option disables the -Werror option passed to
117 GCC. This is necessary for running the test suite.</para>
118 </listitem>
119 </varlistentry>
120
121 <varlistentry>
122 <term><parameter>--enable-obsolete-rpc</parameter> and
123 --enable-obsolete-nsl</term>
124 <listitem>
125 <para>These options build older RPC code for use with
126 network file system utilities (nfs).</para>
127 </listitem>
128 </varlistentry>
129
130 <varlistentry>
131 <term><parameter>--enable-stack-protector=strong</parameter></term>
132 <listitem>
133 <para>This option increases system security by adding a known canary
134 (a random integer) to the stack during a function preamble, and checks
135 it when the function returns. If it changed, there was a stack
136 overflow, and the program aborts.</para>
137 </listitem>
138 </varlistentry>
139
140 <varlistentry>
141 <term><parameter>libc_cv_slibdir=/lib</parameter></term>
142 <listitem>
143 <para>This variable sets the correct library for all
144 systems. We do not want lib64 to be used.</para>
145 </listitem>
146 </varlistentry>
147
148 </variablelist>
149
150 <para>Compile the package:</para>
151
152<screen><userinput remap="make">make</userinput></screen>
153
154 <important>
155 <para>In this section, the test suite for Glibc is considered critical.
156 Do not skip it under any circumstance.</para>
157 </important>
158
159 <para>Generally a few tests do not pass, but you can generally ignore
160 any of the test failures listed below. Now test the build results:</para>
161
162<screen><userinput remap="test">make check</userinput></screen>
163
164 <para>You may see some test failures. The Glibc test suite is
165 somewhat dependent on the host system. This is a list of the most common
166 issues seen for some versions of LFS:</para>
167
168 <itemizedlist>
169
170 <listitem>
171 <para><emphasis>posix/tst-getaddrinfo4</emphasis> and
172 <emphasis>posix/tst-getaddrinfo5</emphasis>
173 may fail on some architectures.</para>
174 </listitem>
175
176 <listitem>
177 <para>The <emphasis>rt/tst-cputimer1</emphasis> and
178 <emphasis>rt/tst-cpuclock2</emphasis> tests have been known to
179 fail. The reason is not completely understood, but indications are
180 that minor timing issues can trigger these failures.</para>
181 </listitem>
182
183 <listitem>
184 <para>The math tests sometimes fail when running on
185 systems where the CPU is not a relatively new Intel or
186 AMD processor.</para>
187 </listitem>
188
189 <listitem>
190 <para>The
191 <emphasis>nptl/tst-thread-affinity-{pthread,pthread2,sched}</emphasis>
192 tests may fail for reasons that have not been determined. </para>
193 </listitem>
194
195 <listitem>
196 <para>Other tests known to fail on some architectures are
197 malloc/tst-malloc-usable and nptl/tst-cleanupx4. </para>
198 </listitem>
199
200 </itemizedlist>
201
202 <para>Though it is a harmless message, the install stage of Glibc will
203 complain about the absence of <filename>/etc/ld.so.conf</filename>.
204 Prevent this warning with:</para>
205
206<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
207
208 <para>Fix the generated Makefile to skip an uneeded sanity check
209 that fails in the LFS partial environment:
210 </para>
211
212<screen><userinput remap="install">sed '/test-installation/s@$(PERL)@echo not running@' -i ../Makefile</userinput></screen>
213
214 <para>Install the package:</para>
215
216<screen><userinput remap="install">make install</userinput></screen>
217
218 <para>Install the configuration file and runtime directory for
219 <command>nscd</command>:</para>
220
221<screen><userinput remap="install">cp -v ../nscd/nscd.conf /etc/nscd.conf
222mkdir -pv /var/cache/nscd</userinput></screen>
223
224 <para revision="systemd">Install the systemd support files for
225 <command>nscd</command>:</para>
226
227 <screen revision="systemd"><userinput remap="install">install -v -Dm644 ../nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
228install -v -Dm644 ../nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
229
230 <para>Next, install the locales that can make the system respond in a
231 different language. None of the locales are required, but if some of them
232 are missing, the test suites of future packages would skip important
233 testcases.</para>
234
235 <para>Individual locales can be installed using the
236 <command>localedef</command> program. E.g., the first
237 <command>localedef</command> command below combines the
238 <filename>/usr/share/i18n/locales/cs_CZ</filename>
239 charset-independent locale definition with the
240 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
241 charmap definition and appends the result to the
242 <filename>/usr/lib/locale/locale-archive</filename> file.
243 The following instructions will install the minimum set of
244 locales necessary for the optimal coverage of tests:</para>
245
246<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
247localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
248localedef -i de_DE -f ISO-8859-1 de_DE
249localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
250localedef -i de_DE -f UTF-8 de_DE.UTF-8
251localedef -i en_GB -f UTF-8 en_GB.UTF-8
252localedef -i en_HK -f ISO-8859-1 en_HK
253localedef -i en_PH -f ISO-8859-1 en_PH
254localedef -i en_US -f ISO-8859-1 en_US
255localedef -i en_US -f UTF-8 en_US.UTF-8
256localedef -i es_MX -f ISO-8859-1 es_MX
257localedef -i fa_IR -f UTF-8 fa_IR
258localedef -i fr_FR -f ISO-8859-1 fr_FR
259localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
260localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
261localedef -i it_IT -f ISO-8859-1 it_IT
262localedef -i it_IT -f UTF-8 it_IT.UTF-8
263localedef -i ja_JP -f EUC-JP ja_JP
264localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
265localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
266localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
267localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
268
269 <para>In addition, install the locale for your own country, language and
270 character set.</para>
271
272 <para>Alternatively, install all locales listed in the
273 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
274 (it includes every locale listed above and many more) at once with the
275 following time-consuming command:</para>
276
277<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
278
279 <para>Then use the <command>localedef</command> command to create and
280 install locales not listed in the
281 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
282 in the unlikely case you need them.</para>
283
284 </sect2>
285
286 <sect2 id="conf-glibc" role="configuration">
287 <title>Configuring Glibc</title>
288
289 <indexterm zone="conf-glibc">
290 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
291 </indexterm>
292
293 <indexterm zone="conf-glibc">
294 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
295 </indexterm>
296
297 <sect3>
298 <title>Adding nsswitch.conf</title>
299
300 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
301 because the Glibc defaults do not work well in a networked environment.
302 </para>
303
304 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
305 following:</para>
306
307<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
308<literal># Begin /etc/nsswitch.conf
309
310passwd: files
311group: files
312shadow: files
313
314hosts: files dns
315networks: files
316
317protocols: files
318services: files
319ethers: files
320rpc: files
321
322# End /etc/nsswitch.conf</literal>
323EOF</userinput></screen>
324
325 </sect3>
326
327 <sect3>
328 <title>Adding time zone data</title>
329
330 <para>Install and set up the time zone data with the following:</para>
331<screen><userinput>tar -xf ../../tzdata&tzdata-version;.tar.gz
332
333ZONEINFO=/usr/share/zoneinfo
334mkdir -pv $ZONEINFO/{posix,right}
335
336for tz in etcetera southamerica northamerica europe africa antarctica \
337 asia australasia backward pacificnew systemv; do
338 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
339 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
340 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
341done
342
343cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
344zic -d $ZONEINFO -p America/New_York
345unset ZONEINFO</userinput></screen>
346
347 <variablelist>
348 <title>The meaning of the zic commands:</title>
349
350 <varlistentry>
351 <term><parameter>zic -L /dev/null ...</parameter></term>
352 <listitem>
353 <para>This creates posix time zones, without any leap seconds. It is
354 conventional to put these in both
355 <filename class="directory">zoneinfo</filename> and
356 <filename class="directory">zoneinfo/posix</filename>. It is
357 necessary to put the POSIX time zones in
358 <filename class="directory">zoneinfo</filename>, otherwise various
359 test-suites will report errors. On an embedded system, where space is
360 tight and you do not intend to ever update the time zones, you could save
361 1.9MB by not using the <filename class="directory">posix</filename>
362 directory, but some applications or test-suites might produce some
363 failures.</para>
364 </listitem>
365 </varlistentry>
366 <varlistentry>
367 <term><parameter>zic -L leapseconds ...</parameter></term>
368 <listitem>
369 <para>This creates right time zones, including leap seconds. On an
370 embedded system, where space is tight and you do not intend to
371 ever update the time zones, or care about the correct time, you could
372 save 1.9MB by omitting the <filename class="directory">right</filename>
373 directory.</para>
374 </listitem>
375 </varlistentry>
376 <varlistentry>
377 <term><parameter>zic ... -p ...</parameter></term>
378 <listitem>
379 <para>This creates the <filename>posixrules</filename> file. We use
380 New York because POSIX requires the daylight savings time rules
381 to be in accordance with US rules.</para>
382 </listitem>
383 </varlistentry>
384 </variablelist>
385
386
387 <para>One way to determine the local time zone is to run the following
388 script:</para>
389
390<screen role="nodump"><userinput>tzselect</userinput></screen>
391
392 <para>After answering a few questions about the location, the script will
393 output the name of the time zone (e.g.,
394 <emphasis>America/Edmonton</emphasis>). There are also some other possible
395 time zones listed in <filename
396 class='directory'>/usr/share/zoneinfo</filename> such as
397 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
398 are not identified by the script but can be used.</para>
399
400 <para>Then create the <filename>/etc/localtime</filename> file by
401 running:</para>
402
403<screen revision="sysv"><userinput>cp -v /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
404
405<screen revision="systemd"><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
406
407 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
408 time zone selected (e.g., Canada/Eastern).</para>
409
410 </sect3>
411
412 <sect3 id="conf-ld" role="configuration">
413 <title>Configuring the Dynamic Loader</title>
414
415 <indexterm zone="conf-ld">
416 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
417 </indexterm>
418
419 <para>By default, the dynamic loader (<filename
420 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
421 <filename class="directory">/lib</filename> and <filename
422 class="directory">/usr/lib</filename> for dynamic libraries that are
423 needed by programs as they are run. However, if there are libraries in
424 directories other than <filename class="directory">/lib</filename> and
425 <filename class="directory">/usr/lib</filename>, these need to be added
426 to the <filename>/etc/ld.so.conf</filename> file in order for the
427 dynamic loader to find them. Two directories that are commonly known
428 to contain additional libraries are <filename
429 class="directory">/usr/local/lib</filename> and <filename
430 class="directory">/opt/lib</filename>, so add those directories to the
431 dynamic loader's search path.</para>
432
433 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
434 following:</para>
435
436<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
437<literal># Begin /etc/ld.so.conf
438/usr/local/lib
439/opt/lib
440</literal>
441EOF</userinput></screen>
442
443 <para>If desired, the dynamic loader can also search a directory and
444 include the contents of files found there. Generally the files in
445 this include directory are one line specifying the desired library path.
446 To add this capability run the following commands:</para>
447
448<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
449<literal># Add an include directory
450include /etc/ld.so.conf.d/*.conf
451</literal>
452EOF
453mkdir -pv /etc/ld.so.conf.d</userinput></screen>
454
455 </sect3>
456 </sect2>
457
458 <sect2 id="contents-glibc" role="content">
459 <title>Contents of Glibc</title>
460
461 <segmentedlist>
462 <segtitle>Installed programs</segtitle>
463 <segtitle>Installed libraries</segtitle>
464 <segtitle>Installed directories</segtitle>
465
466 <seglistitem>
467 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
468 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd,
469 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
470 zdump, and zic</seg>
471 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
472 libc.{a,so}, libc_nonshared.a, libcidn.so,
473 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
474 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
475 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
476 libnss_nisplus.so, libpthread.{a,so},
477 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
478 libthread_db.so, and libutil.{a,so}</seg>
479 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
480 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
481 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
482 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
483 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
484 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
485 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
486 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
487 /var/cache/nscd, and /var/lib/nss_db</seg>
488 </seglistitem>
489 </segmentedlist>
490
491 <variablelist>
492 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
493 <?dbfo list-presentation="list"?>
494 <?dbhtml list-presentation="table"?>
495
496 <varlistentry id="catchsegv">
497 <term><command>catchsegv</command></term>
498 <listitem>
499 <para>Can be used to create a stack trace when a program
500 terminates with a segmentation fault</para>
501 <indexterm zone="ch-system-glibc catchsegv">
502 <primary sortas="b-catchsegv">catchsegv</primary>
503 </indexterm>
504 </listitem>
505 </varlistentry>
506
507 <varlistentry id="gencat">
508 <term><command>gencat</command></term>
509 <listitem>
510 <para>Generates message catalogues</para>
511 <indexterm zone="ch-system-glibc gencat">
512 <primary sortas="b-gencat">gencat</primary>
513 </indexterm>
514 </listitem>
515 </varlistentry>
516
517 <varlistentry id="getconf">
518 <term><command>getconf</command></term>
519 <listitem>
520 <para>Displays the system configuration values for file system
521 specific variables</para>
522 <indexterm zone="ch-system-glibc getconf">
523 <primary sortas="b-getconf">getconf</primary>
524 </indexterm>
525 </listitem>
526 </varlistentry>
527
528 <varlistentry id="getent">
529 <term><command>getent</command></term>
530 <listitem>
531 <para>Gets entries from an administrative database</para>
532 <indexterm zone="ch-system-glibc getent">
533 <primary sortas="b-getent">getent</primary>
534 </indexterm>
535 </listitem>
536 </varlistentry>
537
538 <varlistentry id="iconv">
539 <term><command>iconv</command></term>
540 <listitem>
541 <para>Performs character set conversion</para>
542 <indexterm zone="ch-system-glibc iconv">
543 <primary sortas="b-iconv">iconv</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="iconvconfig">
549 <term><command>iconvconfig</command></term>
550 <listitem>
551 <para>Creates fastloading <command>iconv</command> module configuration
552 files</para>
553 <indexterm zone="ch-system-glibc iconvconfig">
554 <primary sortas="b-iconvconfig">iconvconfig</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="ldconfig">
560 <term><command>ldconfig</command></term>
561 <listitem>
562 <para>Configures the dynamic linker runtime bindings</para>
563 <indexterm zone="ch-system-glibc ldconfig">
564 <primary sortas="b-ldconfig">ldconfig</primary>
565 </indexterm>
566 </listitem>
567 </varlistentry>
568
569 <varlistentry id="ldd">
570 <term><command>ldd</command></term>
571 <listitem>
572 <para>Reports which shared libraries are required
573 by each given program or shared library</para>
574 <indexterm zone="ch-system-glibc ldd">
575 <primary sortas="b-ldd">ldd</primary>
576 </indexterm>
577 </listitem>
578 </varlistentry>
579
580 <varlistentry id="lddlibc4">
581 <term><command>lddlibc4</command></term>
582 <listitem>
583 <para>Assists <command>ldd</command> with object files</para>
584 <indexterm zone="ch-system-glibc lddlibc4">
585 <primary sortas="b-lddlibc4">lddlibc4</primary>
586 </indexterm>
587 </listitem>
588 </varlistentry>
589
590 <varlistentry id="locale">
591 <term><command>locale</command></term>
592 <listitem>
593 <para>Prints various information about the current locale</para>
594 <indexterm zone="ch-system-glibc locale">
595 <primary sortas="b-locale">locale</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="localedef">
601 <term><command>localedef</command></term>
602 <listitem>
603 <para>Compiles locale specifications</para>
604 <indexterm zone="ch-system-glibc localedef">
605 <primary sortas="b-localedef">localedef</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="makedb">
611 <term><command>makedb</command></term>
612 <listitem>
613 <para>Creates a simple database from textual input</para>
614 <indexterm zone="ch-system-glibc makedb">
615 <primary sortas="b-makedb">makedb</primary>
616 </indexterm>
617 </listitem>
618 </varlistentry>
619
620 <varlistentry id="mtrace">
621 <term><command>mtrace</command></term>
622 <listitem>
623 <para>Reads and interprets a memory trace file and displays a summary
624 in human-readable format</para>
625 <indexterm zone="ch-system-glibc mtrace">
626 <primary sortas="b-mtrace">mtrace</primary>
627 </indexterm>
628 </listitem>
629 </varlistentry>
630
631 <varlistentry id="nscd">
632 <term><command>nscd</command></term>
633 <listitem>
634 <para>A daemon that provides a cache for the most common name
635 service requests</para>
636 <indexterm zone="ch-system-glibc nscd">
637 <primary sortas="b-nscd">nscd</primary>
638 </indexterm>
639 </listitem>
640 </varlistentry>
641
642 <varlistentry id="pldd">
643 <term><command>pldd</command></term>
644 <listitem>
645 <para>Lists dynamic shared objects used by running processes</para>
646 <indexterm zone="ch-system-glibc pldd">
647 <primary sortas="b-pldd">pldd</primary>
648 </indexterm>
649 </listitem>
650 </varlistentry>
651
652 <varlistentry id="rpcgen">
653 <term><command>rpcgen</command></term>
654 <listitem>
655 <para>Generates C code to implement the Remote Procedure Call (RPC)
656 protocol</para>
657 <indexterm zone="ch-system-glibc rpcgen">
658 <primary sortas="b-rpcgen">rpcgen</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="sln">
664 <term><command>sln</command></term>
665 <listitem>
666 <para>A statically linked <command>ln</command> program</para>
667 <indexterm zone="ch-system-glibc sln">
668 <primary sortas="b-sln">sln</primary>
669 </indexterm>
670 </listitem>
671 </varlistentry>
672
673 <varlistentry id="sotruss">
674 <term><command>sotruss</command></term>
675 <listitem>
676 <para>Traces shared library procedure calls of a specified command</para>
677 <indexterm zone="ch-system-glibc sotruss">
678 <primary sortas="b-sotruss">sotruss</primary>
679 </indexterm>
680 </listitem>
681 </varlistentry>
682
683 <varlistentry id="sprof">
684 <term><command>sprof</command></term>
685 <listitem>
686 <para>Reads and displays shared object profiling data</para>
687 <indexterm zone="ch-system-glibc sprof">
688 <primary sortas="b-sprof">sprof</primary>
689 </indexterm>
690 </listitem>
691 </varlistentry>
692
693 <varlistentry id="tzselect">
694 <term><command>tzselect</command></term>
695 <listitem>
696 <para>Asks the user about the location of the system and reports
697 the corresponding time zone description</para>
698 <indexterm zone="ch-system-glibc tzselect">
699 <primary sortas="b-tzselect">tzselect</primary>
700 </indexterm>
701 </listitem>
702 </varlistentry>
703
704 <varlistentry id="xtrace">
705 <term><command>xtrace</command></term>
706 <listitem>
707 <para>Traces the execution of a program by printing the currently
708 executed function</para>
709 <indexterm zone="ch-system-glibc xtrace">
710 <primary sortas="b-xtrace">xtrace</primary>
711 </indexterm>
712 </listitem>
713 </varlistentry>
714
715 <varlistentry id="zdump">
716 <term><command>zdump</command></term>
717 <listitem>
718 <para>The time zone dumper</para>
719 <indexterm zone="ch-system-glibc zdump">
720 <primary sortas="b-zdump">zdump</primary>
721 </indexterm>
722 </listitem>
723 </varlistentry>
724
725 <varlistentry id="zic">
726 <term><command>zic</command></term>
727 <listitem>
728 <para>The time zone compiler</para>
729 <indexterm zone="ch-system-glibc zic">
730 <primary sortas="b-zic">zic</primary>
731 </indexterm>
732 </listitem>
733 </varlistentry>
734
735 <varlistentry id="ld.so">
736 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
737 <listitem>
738 <para>The helper program for shared library executables</para>
739 <indexterm zone="ch-system-glibc ld.so">
740 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
741 </indexterm>
742 </listitem>
743 </varlistentry>
744
745 <varlistentry id="libBrokenLocale">
746 <term><filename class="libraryfile">libBrokenLocale</filename></term>
747 <listitem>
748 <para>Used internally by Glibc as a gross hack to get broken programs
749 (e.g., some Motif applications) running. See comments in
750 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
751 for more information</para>
752 <indexterm zone="ch-system-glibc libBrokenLocale">
753 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
754 </indexterm>
755 </listitem>
756 </varlistentry>
757
758 <varlistentry id="libSegFault">
759 <term><filename class="libraryfile">libSegFault</filename></term>
760 <listitem>
761 <para>The segmentation fault signal handler, used by
762 <command>catchsegv</command></para>
763 <indexterm zone="ch-system-glibc libSegFault">
764 <primary sortas="c-libSegFault">libSegFault</primary>
765 </indexterm>
766 </listitem>
767 </varlistentry>
768
769 <varlistentry id="libanl">
770 <term><filename class="libraryfile">libanl</filename></term>
771 <listitem>
772 <para>An asynchronous name lookup library</para>
773 <indexterm zone="ch-system-glibc libanl">
774 <primary sortas="c-libanl">libanl</primary>
775 </indexterm>
776 </listitem>
777 </varlistentry>
778
779 <varlistentry id="libc">
780 <term><filename class="libraryfile">libc</filename></term>
781 <listitem>
782 <para>The main C library</para>
783 <indexterm zone="ch-system-glibc libc">
784 <primary sortas="c-libc">libc</primary>
785 </indexterm>
786 </listitem>
787 </varlistentry>
788
789 <varlistentry id="libcidn">
790 <term><filename class="libraryfile">libcidn</filename></term>
791 <listitem>
792 <para>Used internally by Glibc for handling internationalized domain
793 names in the <function>getaddrinfo()</function> function</para>
794 <indexterm zone="ch-system-glibc libcidn">
795 <primary sortas="c-libcidn">libcidn</primary>
796 </indexterm>
797 </listitem>
798 </varlistentry>
799
800 <varlistentry id="libcrypt">
801 <term><filename class="libraryfile">libcrypt</filename></term>
802 <listitem>
803 <para>The cryptography library</para>
804 <indexterm zone="ch-system-glibc libcrypt">
805 <primary sortas="c-libcrypt">libcrypt</primary>
806 </indexterm>
807 </listitem>
808 </varlistentry>
809
810 <varlistentry id="libdl">
811 <term><filename class="libraryfile">libdl</filename></term>
812 <listitem>
813 <para>The dynamic linking interface library</para>
814 <indexterm zone="ch-system-glibc libdl">
815 <primary sortas="c-libdl">libdl</primary>
816 </indexterm>
817 </listitem>
818 </varlistentry>
819
820 <varlistentry id="libg">
821 <term><filename class="libraryfile">libg</filename></term>
822 <listitem>
823 <para>Dummy library containing no functions. Previously was a runtime
824 library for <command>g++</command></para>
825 <indexterm zone="ch-system-glibc libg">
826 <primary sortas="c-libg">libg</primary>
827 </indexterm>
828 </listitem>
829 </varlistentry>
830
831 <varlistentry id="libieee">
832 <term><filename class="libraryfile">libieee</filename></term>
833 <listitem>
834 <para>Linking in this module forces error handling rules for math
835 functions as defined by the Institute of Electrical and Electronic
836 Engineers (IEEE). The default is POSIX.1 error handling</para>
837 <indexterm zone="ch-system-glibc libieee">
838 <primary sortas="c-libieee">libieee</primary>
839 </indexterm>
840 </listitem>
841 </varlistentry>
842
843 <varlistentry id="libm">
844 <term><filename class="libraryfile">libm</filename></term>
845 <listitem>
846 <para>The mathematical library</para>
847 <indexterm zone="ch-system-glibc libm">
848 <primary sortas="c-libm">libm</primary>
849 </indexterm>
850 </listitem>
851 </varlistentry>
852
853 <varlistentry id="libmcheck">
854 <term><filename class="libraryfile">libmcheck</filename></term>
855 <listitem>
856 <para>Turns on memory allocation checking when linked to</para>
857 <indexterm zone="ch-system-glibc libmcheck">
858 <primary sortas="c-libmcheck">libmcheck</primary>
859 </indexterm>
860 </listitem>
861 </varlistentry>
862
863 <varlistentry id="libmemusage">
864 <term><filename class="libraryfile">libmemusage</filename></term>
865 <listitem>
866 <para>Used by <command>memusage</command> to help collect
867 information about the memory usage of a program</para>
868 <indexterm zone="ch-system-glibc libmemusage">
869 <primary sortas="c-libmemusage">libmemusage</primary>
870 </indexterm>
871 </listitem>
872 </varlistentry>
873
874 <varlistentry id="libnsl">
875 <term><filename class="libraryfile">libnsl</filename></term>
876 <listitem>
877 <para>The network services library</para>
878 <indexterm zone="ch-system-glibc libnsl">
879 <primary sortas="c-libnsl">libnsl</primary>
880 </indexterm>
881 </listitem>
882 </varlistentry>
883
884 <varlistentry id="libnss">
885 <term><filename class="libraryfile">libnss</filename></term>
886 <listitem>
887 <para>The Name Service Switch libraries, containing functions for
888 resolving host names, user names, group names, aliases, services,
889 protocols, etc.</para>
890 <indexterm zone="ch-system-glibc libnss">
891 <primary sortas="c-libnss">libnss</primary>
892 </indexterm>
893 </listitem>
894 </varlistentry>
895
896 <varlistentry id="libpthread">
897 <term><filename class="libraryfile">libpthread</filename></term>
898 <listitem>
899 <para>The POSIX threads library</para>
900 <indexterm zone="ch-system-glibc libpthread">
901 <primary sortas="c-libpthread">libpthread</primary>
902 </indexterm>
903 </listitem>
904 </varlistentry>
905
906 <varlistentry id="libresolv">
907 <term><filename class="libraryfile">libresolv</filename></term>
908 <listitem>
909 <para>Contains functions for creating, sending, and interpreting
910 packets to the Internet domain name servers</para>
911 <indexterm zone="ch-system-glibc libresolv">
912 <primary sortas="c-libresolv">libresolv</primary>
913 </indexterm>
914 </listitem>
915 </varlistentry>
916
917 <varlistentry id="librpcsvc">
918 <term><filename class="libraryfile">librpcsvc</filename></term>
919 <listitem>
920 <para>Contains functions providing miscellaneous RPC services</para>
921 <indexterm zone="ch-system-glibc librpcsvc">
922 <primary sortas="c-librpcsvc">librpcsvc</primary>
923 </indexterm>
924 </listitem>
925 </varlistentry>
926
927 <varlistentry id="librt">
928 <term><filename class="libraryfile">librt</filename></term>
929 <listitem>
930 <para>Contains functions providing most of the interfaces specified
931 by the POSIX.1b Realtime Extension</para>
932 <indexterm zone="ch-system-glibc librt">
933 <primary sortas="c-librt">librt</primary>
934 </indexterm>
935 </listitem>
936 </varlistentry>
937
938 <varlistentry id="libthread_db">
939 <term><filename class="libraryfile">libthread_db</filename></term>
940 <listitem>
941 <para>Contains functions useful for building debuggers for
942 multi-threaded programs</para>
943 <indexterm zone="ch-system-glibc libthread_db">
944 <primary sortas="c-libthread_db">libthread_db</primary>
945 </indexterm>
946 </listitem>
947 </varlistentry>
948
949 <varlistentry id="libutil">
950 <term><filename class="libraryfile">libutil</filename></term>
951 <listitem>
952 <para>Contains code for <quote>standard</quote> functions used in
953 many different Unix utilities</para>
954 <indexterm zone="ch-system-glibc libutil">
955 <primary sortas="c-libutil">libutil</primary>
956 </indexterm>
957 </listitem>
958 </varlistentry>
959
960 </variablelist>
961
962 </sect2>
963
964</sect1>
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