source: chapter08/glibc.xml@ cb518e0

xry111/clfs-ng
Last change on this file since cb518e0 was cb518e0, checked in by Xi Ruoyao <xry111@…>, 9 months ago

cross-ng: remove kernel from hostreqs

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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-fin-sbu;</seg>
37 <seg>&glibc-fin-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46<!-- applied in 2.35 (commit b805aebd42364fe696e417808a700fdb9800c9e8)
47 <para>First, fix a security problem identified upstream:</para>
48
49 <screen><userinput remap="pre">sed -e '/NOTIFY_REMOVED)/s/)/ \&amp;\&amp; data.attr != NULL)/' \
50 -i sysdeps/unix/sysv/linux/mq_notify.c</userinput></screen>
51-->
52 <para>Some of the Glibc programs use the non-FHS compliant
53 <filename class="directory">/var/db</filename> directory to store
54 their runtime data. Apply the following patch to make such programs
55 store their runtime data in the FHS-compliant locations:</para>
56
57<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
58
59 <para>The Glibc documentation recommends building Glibc
60 in a dedicated build directory:</para>
61
62<screen><userinput remap="pre">mkdir -v build
63cd build</userinput></screen>
64
65 <para>Ensure that the <command>ldconfig</command> and <command>sln</command>
66 utilites will be installed into
67 <filename class="directory">/usr/sbin</filename>:</para>
68
69<screen><userinput remap="pre">echo "rootsbindir=/usr/sbin" &gt; configparms</userinput></screen>
70
71 <para>Prepare Glibc for compilation:</para>
72
73<screen><userinput remap="configure">../configure --prefix=/usr \
74 --disable-werror \
75 --enable-kernel=&linux-major-version;.&linux-minor-version; \
76 --enable-stack-protector=strong \
77 --with-headers=/usr/include \
78 libc_cv_slibdir=/usr/lib</userinput></screen>
79
80 <variablelist>
81 <title>The meaning of the configure options:</title>
82
83 <varlistentry>
84 <term><parameter>--disable-werror</parameter></term>
85 <listitem>
86 <para>This option disables the -Werror option passed to
87 GCC. This is necessary for running the test suite.</para>
88 </listitem>
89 </varlistentry>
90
91 <varlistentry>
92 <term><parameter>--enable-kernel=&linux-major-version;.&linux-minor-version;</parameter></term>
93 <listitem>
94 <para>This option tells the build system that this glibc may
95 be used with kernels as old as
96 &linux-major-version;.&linux-minor-version;. This means generating
97 workarounds in case a system call introduced in a later version
98 cannot be used.</para>
99 </listitem>
100 </varlistentry>
101
102 <varlistentry>
103 <term><parameter>--enable-stack-protector=strong</parameter></term>
104 <listitem>
105 <para>This option increases system security by adding
106 extra code to check for buffer overflows, such as stack
107 smashing attacks.</para>
108 </listitem>
109 </varlistentry>
110<!-- do we need this one? -->
111 <varlistentry>
112 <term><parameter>--with-headers=/usr/include</parameter></term>
113 <listitem>
114 <para>This option tells the build system where to find the
115 kernel API headers.</para>
116 </listitem>
117 </varlistentry>
118
119 <varlistentry>
120 <term><parameter>libc_cv_slibdir=/usr/lib</parameter></term>
121 <listitem>
122 <para>This variable sets the correct library for all
123 systems. We do not want lib64 to be used.</para>
124 </listitem>
125 </varlistentry>
126
127 </variablelist>
128
129 <para>Compile the package:</para>
130
131<screen><userinput remap="make">make</userinput></screen>
132
133 <important>
134 <para>In this section, the test suite for Glibc is considered critical.
135 Do not skip it under any circumstance.</para>
136 </important>
137
138 <para>Generally a few tests do not pass. The test failures listed below
139 are usually safe to ignore.</para>
140
141<!-- Use remap="make" here to work around a jhalfs issue. -->
142<!--<screen><userinput remap="make">case $(uname -m) in
143 i?86) ln -sfnv $PWD/elf/ld-linux.so.2 /lib ;;
144 x86_64) ln -sfnv $PWD/elf/ld-linux-x86-64.so.2 /lib ;;
145esac</userinput></screen>
146
147 <note><para>The symbolic link above is needed to run the tests at this
148 stage of building in the chroot environment. It will be overwritten
149 in the install phase below.</para></note>
150-->
151<screen><userinput remap="test">make check</userinput></screen>
152
153 <para>You may see some test failures. The Glibc test suite is
154 somewhat dependent on the host system. A few failures out of
155 over 4200 tests can generally be ignored. This is a list of the
156 most common issues seen for recent versions of LFS:</para>
157
158 <itemizedlist>
159
160 <listitem>
161 <para><emphasis>io/tst-lchmod</emphasis>
162 is known to fail in the LFS chroot environment.</para>
163 </listitem>
164
165 <listitem>
166 <para><emphasis>misc/tst-ttyname</emphasis>
167 is known to fail in the LFS chroot environment.</para>
168 </listitem>
169
170 <listitem>
171 <para>The <emphasis>nss/tst-nss-files-hosts-multi</emphasis>
172 test is known to fail if the system has no non-loopback IP
173 addresses.</para>
174 </listitem>
175<!--
176 <listitem>
177 <para>The <emphasis>rt/tst-cputimer{1,2,3}</emphasis> tests depend on
178 the host system kernel. Kernels 4.14.91&ndash;4.14.96,
179 4.19.13&ndash;4.19.18, and 4.20.0&ndash;4.20.5 are known to
180 cause these tests to fail.
181 </para>
182 </listitem>
183
184 <listitem>
185 <para>The math tests sometimes fail when running on
186 systems where the CPU is not a relatively new Intel or
187 AMD processor.</para>
188 </listitem>
189-->
190 </itemizedlist>
191
192 <para>Though it is a harmless message, the install stage of Glibc will
193 complain about the absence of <filename>/etc/ld.so.conf</filename>.
194 Prevent this warning with:</para>
195
196<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
197
198 <para>Fix the Makefile to skip an unneeded sanity check
199 that fails in the LFS partial environment:
200 </para>
201
202<screen><userinput remap="install">sed '/test-installation/s@$(PERL)@echo not running@' -i ../Makefile</userinput></screen>
203
204 <para>Install the package:</para>
205
206<screen><userinput remap="install">make install</userinput></screen>
207
208 <para>Fix hardcoded path to the executable loader in
209 <command>ldd</command> script:</para>
210
211<screen><userinput remap="install">sed '/RTLDLIST=/s@/usr@@g' -i /usr/bin/ldd</userinput></screen>
212
213 <para>Install the configuration file and runtime directory for
214 <command>nscd</command>:</para>
215
216<screen><userinput remap="install">cp -v ../nscd/nscd.conf /etc/nscd.conf
217mkdir -pv /var/cache/nscd</userinput></screen>
218
219 <para revision="systemd">Install the systemd support files for
220 <command>nscd</command>:</para>
221
222 <screen revision="systemd"><userinput remap="install">install -v -Dm644 ../nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
223install -v -Dm644 ../nscd/nscd.service /usr/lib/systemd/system/nscd.service</userinput></screen>
224
225 <para>Next, install the locales that can make the system respond in a
226 different language. None of the locales are required, but if some of them
227 are missing, the test suites of future packages would skip important
228 testcases.</para>
229
230 <para>Individual locales can be installed using the
231 <command>localedef</command> program. E.g., the second
232 <command>localedef</command> command below combines the
233 <filename>/usr/share/i18n/locales/cs_CZ</filename>
234 charset-independent locale definition with the
235 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
236 charmap definition and appends the result to the
237 <filename>/usr/lib/locale/locale-archive</filename> file.
238 The following instructions will install the minimum set of
239 locales necessary for the optimal coverage of tests:</para>
240
241<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
242localedef -i POSIX -f UTF-8 C.UTF-8 2> /dev/null || true
243localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
244localedef -i de_DE -f ISO-8859-1 de_DE
245localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
246localedef -i de_DE -f UTF-8 de_DE.UTF-8
247localedef -i el_GR -f ISO-8859-7 el_GR
248localedef -i en_GB -f ISO-8859-1 en_GB
249localedef -i en_GB -f UTF-8 en_GB.UTF-8
250localedef -i en_HK -f ISO-8859-1 en_HK
251localedef -i en_PH -f ISO-8859-1 en_PH
252localedef -i en_US -f ISO-8859-1 en_US
253localedef -i en_US -f UTF-8 en_US.UTF-8
254localedef -i es_ES -f ISO-8859-15 es_ES@euro
255localedef -i es_MX -f ISO-8859-1 es_MX
256localedef -i fa_IR -f UTF-8 fa_IR
257localedef -i fr_FR -f ISO-8859-1 fr_FR
258localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
259localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
260localedef -i is_IS -f ISO-8859-1 is_IS
261localedef -i is_IS -f UTF-8 is_IS.UTF-8
262localedef -i it_IT -f ISO-8859-1 it_IT
263localedef -i it_IT -f ISO-8859-15 it_IT@euro
264localedef -i it_IT -f UTF-8 it_IT.UTF-8
265localedef -i ja_JP -f EUC-JP ja_JP
266localedef -i ja_JP -f SHIFT_JIS ja_JP.SJIS 2> /dev/null || true
267localedef -i ja_JP -f UTF-8 ja_JP.UTF-8
268localedef -i nl_NL@euro -f ISO-8859-15 nl_NL@euro
269localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
270localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
271localedef -i se_NO -f UTF-8 se_NO.UTF-8
272localedef -i ta_IN -f UTF-8 ta_IN.UTF-8
273localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
274localedef -i zh_CN -f GB18030 zh_CN.GB18030
275localedef -i zh_HK -f BIG5-HKSCS zh_HK.BIG5-HKSCS
276localedef -i zh_TW -f UTF-8 zh_TW.UTF-8</userinput></screen>
277
278 <para>In addition, install the locale for your own country, language and
279 character set.</para>
280
281 <para>Alternatively, install all locales listed in the
282 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
283 (it includes every locale listed above and many more) at once with the
284 following time-consuming command:</para>
285
286<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
287
288 <para>Then use the <command>localedef</command> command to create and
289 install locales not listed in the
290 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
291 when you need them. For instance, the following two locales are
292 needed for some tests later in this chapter:</para>
293
294<screen role="nodump"><userinput remap="locale-full">localedef -i POSIX -f UTF-8 C.UTF-8 2> /dev/null || true
295localedef -i ja_JP -f SHIFT_JIS ja_JP.SJIS 2> /dev/null || true</userinput></screen>
296
297 <note><para>Glibc now uses libidn2 when resolving internationalized
298 domain names. This is a run time dependency. If this capability
299 is needed, the instructions for installing libidn2 are in the
300 <ulink url="&blfs-book;general/libidn2.html">BLFS libidn2 page</ulink>.
301 </para></note>
302
303 </sect2>
304
305 <sect2 id="conf-glibc" role="configuration">
306 <title>Configuring Glibc</title>
307
308 <indexterm zone="conf-glibc">
309 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
310 </indexterm>
311
312 <indexterm zone="conf-glibc">
313 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
314 </indexterm>
315
316 <sect3>
317 <title>Adding nsswitch.conf</title>
318
319 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
320 because the Glibc defaults do not work well in a networked environment.
321 </para>
322
323 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
324 following:</para>
325
326<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
327<literal># Begin /etc/nsswitch.conf
328
329passwd: files
330group: files
331shadow: files
332
333hosts: files dns
334networks: files
335
336protocols: files
337services: files
338ethers: files
339rpc: files
340
341# End /etc/nsswitch.conf</literal>
342EOF</userinput></screen>
343
344 </sect3>
345
346 <sect3>
347 <title>Adding time zone data</title>
348
349 <para>Install and set up the time zone data with the following:</para>
350<screen><userinput>tar -xf ../../tzdata&tzdata-version;.tar.gz
351
352ZONEINFO=/usr/share/zoneinfo
353mkdir -pv $ZONEINFO/{posix,right}
354
355for tz in etcetera southamerica northamerica europe africa antarctica \
356 asia australasia backward; do
357 zic -L /dev/null -d $ZONEINFO ${tz}
358 zic -L /dev/null -d $ZONEINFO/posix ${tz}
359 zic -L leapseconds -d $ZONEINFO/right ${tz}
360done
361
362cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
363zic -d $ZONEINFO -p America/New_York
364unset ZONEINFO</userinput></screen>
365
366 <variablelist>
367 <title>The meaning of the zic commands:</title>
368
369 <varlistentry>
370 <term><parameter>zic -L /dev/null ...</parameter></term>
371 <listitem>
372 <para>This creates posix time zones without any leap seconds. It is
373 conventional to put these in both
374 <filename class="directory">zoneinfo</filename> and
375 <filename class="directory">zoneinfo/posix</filename>. It is
376 necessary to put the POSIX time zones in
377 <filename class="directory">zoneinfo</filename>, otherwise various
378 test-suites will report errors. On an embedded system, where space is
379 tight and you do not intend to ever update the time zones, you could save
380 1.9 MB by not using the <filename class="directory">posix</filename>
381 directory, but some applications or test-suites might produce some
382 failures.</para>
383 </listitem>
384 </varlistentry>
385 <varlistentry>
386 <term><parameter>zic -L leapseconds ...</parameter></term>
387 <listitem>
388 <para>This creates right time zones, including leap seconds. On an
389 embedded system, where space is tight and you do not intend to
390 ever update the time zones, or care about the correct time, you could
391 save 1.9MB by omitting the <filename class="directory">right</filename>
392 directory.</para>
393 </listitem>
394 </varlistentry>
395 <varlistentry>
396 <term><parameter>zic ... -p ...</parameter></term>
397 <listitem>
398 <para>This creates the <filename>posixrules</filename> file. We use
399 New York because POSIX requires the daylight savings time rules
400 to be in accordance with US rules.</para>
401 </listitem>
402 </varlistentry>
403 </variablelist>
404
405
406 <para>One way to determine the local time zone is to run the following
407 script:</para>
408
409<screen role="nodump"><userinput>tzselect</userinput></screen>
410
411 <para>After answering a few questions about the location, the script will
412 output the name of the time zone (e.g.,
413 <emphasis>America/Edmonton</emphasis>). There are also some other possible
414 time zones listed in <filename
415 class='directory'>/usr/share/zoneinfo</filename> such as
416 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
417 are not identified by the script but can be used.</para>
418
419 <para>Then create the <filename>/etc/localtime</filename> file by
420 running:</para>
421
422<screen><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
423
424 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
425 time zone selected (e.g., Canada/Eastern).</para>
426
427 </sect3>
428
429 <sect3 id="conf-ld" role="configuration">
430 <title>Configuring the Dynamic Loader</title>
431
432 <indexterm zone="conf-ld">
433 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
434 </indexterm>
435
436 <para>By default, the dynamic loader (<filename
437 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
438 <filename class="directory">/lib</filename> and <filename
439 class="directory">/usr/lib</filename> for dynamic libraries that are
440 needed by programs as they are run. However, if there are libraries in
441 directories other than <filename class="directory">/lib</filename> and
442 <filename class="directory">/usr/lib</filename>, these need to be added
443 to the <filename>/etc/ld.so.conf</filename> file in order for the
444 dynamic loader to find them. Two directories that are commonly known
445 to contain additional libraries are <filename
446 class="directory">/usr/local/lib</filename> and <filename
447 class="directory">/opt/lib</filename>, so add those directories to the
448 dynamic loader's search path.</para>
449
450 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
451 following:</para>
452
453<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
454<literal># Begin /etc/ld.so.conf
455/usr/local/lib
456/opt/lib
457</literal>
458EOF</userinput></screen>
459
460 <para>If desired, the dynamic loader can also search a directory and
461 include the contents of files found there. Generally the files in
462 this include directory are one line specifying the desired library path.
463 To add this capability run the following commands:</para>
464
465<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
466<literal># Add an include directory
467include /etc/ld.so.conf.d/*.conf
468</literal>
469EOF
470mkdir -pv /etc/ld.so.conf.d</userinput></screen>
471
472 </sect3>
473 </sect2>
474
475 <sect2 id="contents-glibc" role="content">
476 <title>Contents of Glibc</title>
477
478 <segmentedlist>
479 <segtitle>Installed programs</segtitle>
480 <segtitle>Installed libraries</segtitle>
481 <segtitle>Installed directories</segtitle>
482
483 <seglistitem>
484 <seg>gencat, getconf, getent, iconv, iconvconfig, ldconfig,
485 ldd, lddlibc4,
486 ld.so (symlink to ld-linux-x86-64.so.2 or ld-linux.so.2),
487 locale, localedef, makedb, mtrace, nscd,
488 pcprofiledump, pldd, sln, sotruss, sprof, tzselect, xtrace,
489 zdump, and zic</seg>
490 <seg>ld-linux-x86-64.so.2, ld-linux.so.2,
491 libBrokenLocale.{a,so}, libanl.{a,so},
492 libc.{a,so}, libc_nonshared.a, libc_malloc_debug.so,
493 libcrypt.{a,so}, libdl.{a,so.2}, libg.a, libm.{a,so},
494 libmcheck.a, libmemusage.so, libmvec.{a,so}, libnsl.so.1,
495 libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
496 libpcprofile.so, libpthread.{a,so.0},
497 libresolv.{a,so}, librt.{a,so.1},
498 libthread_db.so, and libutil.{a,so.1}</seg>
499 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
500 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
501 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
502 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
503 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
504 /usr/include/protocols, /usr/include/rpc,
505 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
506 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
507 /var/cache/nscd, and /var/lib/nss_db</seg>
508 </seglistitem>
509 </segmentedlist>
510
511 <variablelist>
512 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
513 <?dbfo list-presentation="list"?>
514 <?dbhtml list-presentation="table"?>
515
516 <varlistentry id="gencat">
517 <term><command>gencat</command></term>
518 <listitem>
519 <para>Generates message catalogues</para>
520 <indexterm zone="ch-system-glibc gencat">
521 <primary sortas="b-gencat">gencat</primary>
522 </indexterm>
523 </listitem>
524 </varlistentry>
525
526 <varlistentry id="getconf">
527 <term><command>getconf</command></term>
528 <listitem>
529 <para>Displays the system configuration values for file system
530 specific variables</para>
531 <indexterm zone="ch-system-glibc getconf">
532 <primary sortas="b-getconf">getconf</primary>
533 </indexterm>
534 </listitem>
535 </varlistentry>
536
537 <varlistentry id="getent">
538 <term><command>getent</command></term>
539 <listitem>
540 <para>Gets entries from an administrative database</para>
541 <indexterm zone="ch-system-glibc getent">
542 <primary sortas="b-getent">getent</primary>
543 </indexterm>
544 </listitem>
545 </varlistentry>
546
547 <varlistentry id="iconv">
548 <term><command>iconv</command></term>
549 <listitem>
550 <para>Performs character set conversion</para>
551 <indexterm zone="ch-system-glibc iconv">
552 <primary sortas="b-iconv">iconv</primary>
553 </indexterm>
554 </listitem>
555 </varlistentry>
556
557 <varlistentry id="iconvconfig">
558 <term><command>iconvconfig</command></term>
559 <listitem>
560 <para>Creates fastloading <command>iconv</command> module configuration
561 files</para>
562 <indexterm zone="ch-system-glibc iconvconfig">
563 <primary sortas="b-iconvconfig">iconvconfig</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="ldconfig">
569 <term><command>ldconfig</command></term>
570 <listitem>
571 <para>Configures the dynamic linker runtime bindings</para>
572 <indexterm zone="ch-system-glibc ldconfig">
573 <primary sortas="b-ldconfig">ldconfig</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="ldd">
579 <term><command>ldd</command></term>
580 <listitem>
581 <para>Reports which shared libraries are required
582 by each given program or shared library</para>
583 <indexterm zone="ch-system-glibc ldd">
584 <primary sortas="b-ldd">ldd</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="lddlibc4">
590 <term><command>lddlibc4</command></term>
591 <listitem>
592 <para>Assists <command>ldd</command> with object files.
593 It does not exist on newer architectures like x86_64</para>
594 <indexterm zone="ch-system-glibc lddlibc4">
595 <primary sortas="b-lddlibc4">lddlibc4</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="locale">
601 <term><command>locale</command></term>
602 <listitem>
603 <para>Prints various information about the current locale</para>
604 <indexterm zone="ch-system-glibc locale">
605 <primary sortas="b-locale">locale</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="localedef">
611 <term><command>localedef</command></term>
612 <listitem>
613 <para>Compiles locale specifications</para>
614 <indexterm zone="ch-system-glibc localedef">
615 <primary sortas="b-localedef">localedef</primary>
616 </indexterm>
617 </listitem>
618 </varlistentry>
619
620 <varlistentry id="makedb">
621 <term><command>makedb</command></term>
622 <listitem>
623 <para>Creates a simple database from textual input</para>
624 <indexterm zone="ch-system-glibc makedb">
625 <primary sortas="b-makedb">makedb</primary>
626 </indexterm>
627 </listitem>
628 </varlistentry>
629
630 <varlistentry id="mtrace">
631 <term><command>mtrace</command></term>
632 <listitem>
633 <para>Reads and interprets a memory trace file and displays a summary
634 in human-readable format</para>
635 <indexterm zone="ch-system-glibc mtrace">
636 <primary sortas="b-mtrace">mtrace</primary>
637 </indexterm>
638 </listitem>
639 </varlistentry>
640
641 <varlistentry id="nscd">
642 <term><command>nscd</command></term>
643 <listitem>
644 <para>A daemon that provides a cache for the most common name
645 service requests</para>
646 <indexterm zone="ch-system-glibc nscd">
647 <primary sortas="b-nscd">nscd</primary>
648 </indexterm>
649 </listitem>
650 </varlistentry>
651
652 <varlistentry id="pcprofiledump">
653 <term><command>pcprofiledump</command></term>
654 <listitem>
655 <para>Dump information generated by PC profiling</para>
656 <indexterm zone="ch-system-glibc pcprofiledump">
657 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
658 </indexterm>
659 </listitem>
660 </varlistentry>
661
662 <varlistentry id="pldd">
663 <term><command>pldd</command></term>
664 <listitem>
665 <para>Lists dynamic shared objects used by running processes</para>
666 <indexterm zone="ch-system-glibc pldd">
667 <primary sortas="b-pldd">pldd</primary>
668 </indexterm>
669 </listitem>
670 </varlistentry>
671
672 <varlistentry id="sln">
673 <term><command>sln</command></term>
674 <listitem>
675 <para>A statically linked <command>ln</command> program</para>
676 <indexterm zone="ch-system-glibc sln">
677 <primary sortas="b-sln">sln</primary>
678 </indexterm>
679 </listitem>
680 </varlistentry>
681
682 <varlistentry id="sotruss">
683 <term><command>sotruss</command></term>
684 <listitem>
685 <para>Traces shared library procedure calls of a specified command</para>
686 <indexterm zone="ch-system-glibc sotruss">
687 <primary sortas="b-sotruss">sotruss</primary>
688 </indexterm>
689 </listitem>
690 </varlistentry>
691
692 <varlistentry id="sprof">
693 <term><command>sprof</command></term>
694 <listitem>
695 <para>Reads and displays shared object profiling data</para>
696 <indexterm zone="ch-system-glibc sprof">
697 <primary sortas="b-sprof">sprof</primary>
698 </indexterm>
699 </listitem>
700 </varlistentry>
701
702 <varlistentry id="tzselect">
703 <term><command>tzselect</command></term>
704 <listitem>
705 <para>Asks the user about the location of the system and reports
706 the corresponding time zone description</para>
707 <indexterm zone="ch-system-glibc tzselect">
708 <primary sortas="b-tzselect">tzselect</primary>
709 </indexterm>
710 </listitem>
711 </varlistentry>
712
713 <varlistentry id="xtrace">
714 <term><command>xtrace</command></term>
715 <listitem>
716 <para>Traces the execution of a program by printing the currently
717 executed function</para>
718 <indexterm zone="ch-system-glibc xtrace">
719 <primary sortas="b-xtrace">xtrace</primary>
720 </indexterm>
721 </listitem>
722 </varlistentry>
723
724 <varlistentry id="zdump">
725 <term><command>zdump</command></term>
726 <listitem>
727 <para>The time zone dumper</para>
728 <indexterm zone="ch-system-glibc zdump">
729 <primary sortas="b-zdump">zdump</primary>
730 </indexterm>
731 </listitem>
732 </varlistentry>
733
734 <varlistentry id="zic">
735 <term><command>zic</command></term>
736 <listitem>
737 <para>The time zone compiler</para>
738 <indexterm zone="ch-system-glibc zic">
739 <primary sortas="b-zic">zic</primary>
740 </indexterm>
741 </listitem>
742 </varlistentry>
743
744 <varlistentry id="ld.so">
745 <term><filename class="libraryfile">ld-*.so</filename></term>
746 <listitem>
747 <para>The helper program for shared library executables</para>
748 <indexterm zone="ch-system-glibc ld.so">
749 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
750 </indexterm>
751 </listitem>
752 </varlistentry>
753
754 <varlistentry id="libBrokenLocale">
755 <term><filename class="libraryfile">libBrokenLocale</filename></term>
756 <listitem>
757 <para>Used internally by Glibc as a gross hack to get broken programs
758 (e.g., some Motif applications) running. See comments in
759 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
760 for more information</para>
761 <indexterm zone="ch-system-glibc libBrokenLocale">
762 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
763 </indexterm>
764 </listitem>
765 </varlistentry>
766
767 <varlistentry id="libanl">
768 <term><filename class="libraryfile">libanl</filename></term>
769 <listitem>
770 <para>An asynchronous name lookup library</para>
771 <indexterm zone="ch-system-glibc libanl">
772 <primary sortas="c-libanl">libanl</primary>
773 </indexterm>
774 </listitem>
775 </varlistentry>
776
777 <varlistentry id="libc">
778 <term><filename class="libraryfile">libc</filename></term>
779 <listitem>
780 <para>The main C library</para>
781 <indexterm zone="ch-system-glibc libc">
782 <primary sortas="c-libc">libc</primary>
783 </indexterm>
784 </listitem>
785 </varlistentry>
786
787 <varlistentry id="libc_malloc_debug">
788 <term><filename class="libraryfile">libc_malloc_debug</filename></term>
789 <listitem>
790 <para>Turns on memory allocation checking when preloaded</para>
791 <indexterm zone="ch-system-glibc libc_malloc_debug">
792 <primary sortas="c-libc_malloc_debug">libc_malloc_debug</primary>
793 </indexterm>
794 </listitem>
795 </varlistentry>
796
797 <varlistentry id="libcrypt">
798 <term><filename class="libraryfile">libcrypt</filename></term>
799 <listitem>
800 <para>The cryptography library</para>
801 <indexterm zone="ch-system-glibc libcrypt">
802 <primary sortas="c-libcrypt">libcrypt</primary>
803 </indexterm>
804 </listitem>
805 </varlistentry>
806
807 <varlistentry id="libdl">
808 <term><filename class="libraryfile">libdl</filename></term>
809 <listitem>
810 <para>Dummy library containing no functions. Previously was the
811 dynamic linking interface library, whose functions are now in
812 <filename class="libraryfile">libc</filename></para>
813 <indexterm zone="ch-system-glibc libdl">
814 <primary sortas="c-libdl">libdl</primary>
815 </indexterm>
816 </listitem>
817 </varlistentry>
818
819 <varlistentry id="libg">
820 <term><filename class="libraryfile">libg</filename></term>
821 <listitem>
822 <para>Dummy library containing no functions. Previously was a runtime
823 library for <command>g++</command></para>
824 <indexterm zone="ch-system-glibc libg">
825 <primary sortas="c-libg">libg</primary>
826 </indexterm>
827 </listitem>
828 </varlistentry>
829
830 <varlistentry id="libm">
831 <term><filename class="libraryfile">libm</filename></term>
832 <listitem>
833 <para>The mathematical library</para>
834 <indexterm zone="ch-system-glibc libm">
835 <primary sortas="c-libm">libm</primary>
836 </indexterm>
837 </listitem>
838 </varlistentry>
839
840 <varlistentry id="libmvec">
841 <term><filename class="libraryfile">libmvec</filename></term>
842 <listitem>
843 <para>The vector math library, linked in as needed
844 when <filename class='libraryfile'>libm</filename> is used</para>
845 <indexterm zone="ch-system-glibc libmvec">
846 <primary sortas="c-libmvec">libmvec</primary>
847 </indexterm>
848 </listitem>
849 </varlistentry>
850
851 <varlistentry id="libmcheck">
852 <term><filename class="libraryfile">libmcheck</filename></term>
853 <listitem>
854 <para>Turns on memory allocation checking when linked to</para>
855 <indexterm zone="ch-system-glibc libmcheck">
856 <primary sortas="c-libmcheck">libmcheck</primary>
857 </indexterm>
858 </listitem>
859 </varlistentry>
860
861 <varlistentry id="libmemusage">
862 <term><filename class="libraryfile">libmemusage</filename></term>
863 <listitem>
864 <para>Used by <command>memusage</command> to help collect
865 information about the memory usage of a program</para>
866 <indexterm zone="ch-system-glibc libmemusage">
867 <primary sortas="c-libmemusage">libmemusage</primary>
868 </indexterm>
869 </listitem>
870 </varlistentry>
871
872 <varlistentry id="libnsl">
873 <term><filename class="libraryfile">libnsl</filename></term>
874 <listitem>
875 <para>The network services library, now deprecated</para>
876 <indexterm zone="ch-system-glibc libnsl">
877 <primary sortas="c-libnsl">libnsl</primary>
878 </indexterm>
879 </listitem>
880 </varlistentry>
881
882 <varlistentry id="libnss">
883 <term><filename class="libraryfile">libnss_*</filename></term>
884 <listitem>
885 <para>The Name Service Switch modules, containing functions for
886 resolving host names, user names, group names, aliases, services,
887 protocols, etc. Loaded by
888 <filename class='libraryfile'>libc</filename> according to the
889 configuration in <filename>/etc/nsswitch.conf</filename></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="libpcprofile">
897 <term><filename class="libraryfile">libpcprofile</filename></term>
898 <listitem>
899 <para>Can be preloaded to PC profile an executable</para>
900 <indexterm zone="ch-system-glibc libpcprofile">
901 <primary sortas="c-libpcprofile">libpcprofile</primary>
902 </indexterm>
903 </listitem>
904 </varlistentry>
905
906 <varlistentry id="libpthread">
907 <term><filename class="libraryfile">libpthread</filename></term>
908 <listitem>
909 <para>Dummy library containing no functions. Previously contained
910 functions providing most of the interfaces specified
911 by the POSIX.1b Realtime Extension, now the functions are in
912 <filename class="libraryfile">libc</filename></para>
913 <indexterm zone="ch-system-glibc libpthread">
914 <primary sortas="c-libpthread">libpthread</primary>
915 </indexterm>
916 </listitem>
917 </varlistentry>
918
919 <varlistentry id="libresolv">
920 <term><filename class="libraryfile">libresolv</filename></term>
921 <listitem>
922 <para>Contains functions for creating, sending, and interpreting
923 packets to the Internet domain name servers</para>
924 <indexterm zone="ch-system-glibc libresolv">
925 <primary sortas="c-libresolv">libresolv</primary>
926 </indexterm>
927 </listitem>
928 </varlistentry>
929
930 <varlistentry id="librt">
931 <term><filename class="libraryfile">librt</filename></term>
932 <listitem>
933 <para>Contains functions providing most of the interfaces specified
934 by the POSIX.1b Realtime Extension</para>
935 <indexterm zone="ch-system-glibc librt">
936 <primary sortas="c-librt">librt</primary>
937 </indexterm>
938 </listitem>
939 </varlistentry>
940
941 <varlistentry id="libthread_db">
942 <term><filename class="libraryfile">libthread_db</filename></term>
943 <listitem>
944 <para>Contains functions useful for building debuggers for
945 multi-threaded programs</para>
946 <indexterm zone="ch-system-glibc libthread_db">
947 <primary sortas="c-libthread_db">libthread_db</primary>
948 </indexterm>
949 </listitem>
950 </varlistentry>
951
952 <varlistentry id="libutil">
953 <term><filename class="libraryfile">libutil</filename></term>
954 <listitem>
955 <para>Dummy library containing no functions. Previously contained
956 code for <quote>standard</quote> functions used in
957 many different Unix utilities. These functions are now in
958 <filename class="libraryfile">libc</filename></para>
959 <indexterm zone="ch-system-glibc libutil">
960 <primary sortas="c-libutil">libutil</primary>
961 </indexterm>
962 </listitem>
963 </varlistentry>
964
965 </variablelist>
966
967 </sect2>
968
969</sect1>
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