source: chapter08/glibc.xml@ f5c3bf6

11.0 11.0-rc1 11.0-rc2 11.0-rc3 11.1 11.1-rc1 11.2 11.2-rc1 11.3 11.3-rc1 12.0 12.0-rc1 12.1 12.1-rc1 arm bdubbs/gcc13 ml-11.0 multilib renodr/libudev-from-systemd s6-init trunk xry111/arm64 xry111/arm64-12.0 xry111/clfs-ng xry111/lfs-next xry111/loongarch xry111/loongarch-12.0 xry111/loongarch-12.1 xry111/mips64el xry111/pip3 xry111/rust-wip-20221008 xry111/update-glibc
Last change on this file since f5c3bf6 was f5c3bf6, checked in by Thomas Trepl (Moody) <thomas@…>, 3 years ago

Use a configuration option to set the loader pathes in ldd
  • Property mode set to 100644
File size: 35.2 KB
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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 <para>Some of the Glibc programs use the non-FHS compliant
47 <filename class="directory">/var/db</filename> directory to store
48 their runtime data. Apply the following patch to make such programs
49 store their runtime data in the FHS-compliant locations:</para>
50
51<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
52
53 <para>Fix a bug that causes issues with chrooted applications:</para>
54
55 <screen><userinput remap="pre">sed -e '402a\ *result = local->data.services[database_index];' \
56 -i nss/nss_database.c</userinput></screen>
57
58 <para>Fix a build issue with gcc-11.1:</para>
59
60<screen><userinput remap="pre">sed 's/amx_/amx-/' -i sysdeps/x86/tst-cpu-features-supports.c</userinput></screen>
61
62 <para>The Glibc documentation recommends building Glibc
63 in a dedicated build directory:</para>
64
65<screen><userinput remap="pre">mkdir -v build
66cd build</userinput></screen>
67
68 <para>Prepare Glibc for compilation:</para>
69
70<screen><userinput remap="configure">../configure --prefix=/usr \
71 --disable-werror \
72 --enable-kernel=&min-kernel; \
73 --enable-stack-protector=strong \
74 --with-headers=/usr/include \
75 libc_cv_slibdir=/usr/lib \
76 libc_cv_rtlddir=/lib</userinput></screen>
77
78 <variablelist>
79 <title>The meaning of the configure options:</title>
80
81 <varlistentry>
82 <term><parameter>--disable-werror</parameter></term>
83 <listitem>
84 <para>This option disables the -Werror option passed to
85 GCC. This is necessary for running the test suite.</para>
86 </listitem>
87 </varlistentry>
88
89 <varlistentry>
90 <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
91 <listitem>
92 <para>This option tells the build system that this glibc may
93 be used with kernels as old as &min-kernel;. This means generating
94 workarounds in case a system call introduced in a later version
95 cannot be used.</para>
96 </listitem>
97 </varlistentry>
98
99 <varlistentry>
100 <term><parameter>--enable-stack-protector=strong</parameter></term>
101 <listitem>
102 <para>This option increases system security by adding
103 extra code to check for buffer overflows, such as stack
104 smashing attacks.</para>
105 </listitem>
106 </varlistentry>
107<!-- do we need this one? -->
108 <varlistentry>
109 <term><parameter>--with-headers=/usr/include</parameter></term>
110 <listitem>
111 <para>This option tells the build system where to find the
112 kernel API headers.</para>
113 </listitem>
114 </varlistentry>
115
116 <varlistentry>
117 <term><parameter>libc_cv_slibdir=/usr/lib</parameter></term>
118 <listitem>
119 <para>This variable sets the correct library for all
120 systems. We do not want lib64 to be used.</para>
121 </listitem>
122 </varlistentry>
123
124 <varlistentry>
125 <term><parameter>libc_cv_rtlddir=/lib</parameter></term>
126 <listitem>
127 <para>Fix hardcoded path to the executable loader in the
128 <command>ldd</command> script.</para>
129 </listitem>
130 </varlistentry>
131
132 <varlistentry>
133 <term><option>libc_cv_include_x86_isa_level=no</option></term>
134 <listitem>
135 <para>This disables <quote>x86 ISA needed</quote> property in
136 Glibc libraries. Use it <emphasis role="bold">if</emphasis>
137 you are building Glibc with <option>-march</option> option in
138 <envar>CFLAGS</envar>, to workaround an issue in Glibc-2.33
139 breaking it.</para>
140 </listitem>
141 </varlistentry>
142
143 </variablelist>
144
145 <para>Compile the package:</para>
146
147<screen><userinput remap="make">make</userinput></screen>
148
149 <important>
150 <para>In this section, the test suite for Glibc is considered critical.
151 Do not skip it under any circumstance.</para>
152 </important>
153
154 <para>Generally a few tests do not pass. The test failures listed below
155 are usually safe to ignore.</para>
156
157<!-- Use remap="make" here to work around a jhalfs issue. -->
158<!--<screen><userinput remap="make">case $(uname -m) in
159 i?86) ln -sfnv $PWD/elf/ld-linux.so.2 /lib ;;
160 x86_64) ln -sfnv $PWD/elf/ld-linux-x86-64.so.2 /lib ;;
161esac</userinput></screen>
162
163 <note><para>The symbolic link above is needed to run the tests at this
164 stage of building in the chroot environment. It will be overwritten
165 in the install phase below.</para></note>
166-->
167<screen><userinput remap="test">make check</userinput></screen>
168
169 <para>You may see some test failures. The Glibc test suite is
170 somewhat dependent on the host system. This is a list of the most common
171 issues seen for some versions of LFS:</para>
172
173 <itemizedlist>
174
175 <listitem>
176 <para><emphasis>io/tst-lchmod</emphasis>
177 is known to fail in the LFS chroot environment.</para>
178 </listitem>
179
180 <listitem>
181 <para><emphasis>misc/tst-ttyname</emphasis>
182 is known to fail in the LFS chroot environment.</para>
183 </listitem>
184
185 <listitem>
186 <para><emphasis>elf/tst-cpu-features-cpuinfo</emphasis>
187 may fail on some architectures.</para>
188 </listitem>
189
190 <listitem>
191 <para>The <emphasis>nss/tst-nss-files-hosts-multi</emphasis>
192 test may fail for reasons that have not been determined.</para>
193 </listitem>
194
195 <listitem>
196 <para>The <emphasis>rt/tst-cputimer{1,2,3}</emphasis> tests depend on
197 the host system kernel. Kernels 4.14.91&ndash;4.14.96,
198 4.19.13&ndash;4.19.18, and 4.20.0&ndash;4.20.5 are known to
199 cause these tests to fail.
200 </para>
201 </listitem>
202
203 <listitem>
204 <para>The math tests sometimes fail when running on
205 systems where the CPU is not a relatively new Intel or
206 AMD processor.</para>
207 </listitem>
208
209 </itemizedlist>
210
211 <para>Though it is a harmless message, the install stage of Glibc will
212 complain about the absence of <filename>/etc/ld.so.conf</filename>.
213 Prevent this warning with:</para>
214
215<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
216
217 <para>Fix the generated Makefile to skip an unneeded sanity check
218 that fails in the LFS partial environment:
219 </para>
220
221<screen><userinput remap="install">sed '/test-installation/s@$(PERL)@echo not running@' -i ../Makefile</userinput></screen>
222
223 <para>Install the package:</para>
224
225<screen><userinput remap="install">make install</userinput></screen>
226<!--
227 <para>Fix hardcoded path to the executable loader in
228 <command>ldd</command> script:</para>
229
230<screen><userinput remap="install">sed '/RTLDLIST=/s@/usr@@g' -i /usr/bin/ldd</userinput></screen>
231-->
232 <para>Install the configuration file and runtime directory for
233 <command>nscd</command>:</para>
234
235<screen><userinput remap="install">cp -v ../nscd/nscd.conf /etc/nscd.conf
236mkdir -pv /var/cache/nscd</userinput></screen>
237
238 <para revision="systemd">Install the systemd support files for
239 <command>nscd</command>:</para>
240
241 <screen revision="systemd"><userinput remap="install">install -v -Dm644 ../nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
242install -v -Dm644 ../nscd/nscd.service /usr/lib/systemd/system/nscd.service</userinput></screen>
243
244 <para>Next, install the locales that can make the system respond in a
245 different language. None of the locales are required, but if some of them
246 are missing, the test suites of future packages would skip important
247 testcases.</para>
248
249 <para>Individual locales can be installed using the
250 <command>localedef</command> program. E.g., the first
251 <command>localedef</command> command below combines the
252 <filename>/usr/share/i18n/locales/cs_CZ</filename>
253 charset-independent locale definition with the
254 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
255 charmap definition and appends the result to the
256 <filename>/usr/lib/locale/locale-archive</filename> file.
257 The following instructions will install the minimum set of
258 locales necessary for the optimal coverage of tests:</para>
259
260<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
261localedef -i POSIX -f UTF-8 C.UTF-8 2> /dev/null || true
262localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
263localedef -i de_DE -f ISO-8859-1 de_DE
264localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
265localedef -i de_DE -f UTF-8 de_DE.UTF-8
266localedef -i el_GR -f ISO-8859-7 el_GR
267localedef -i en_GB -f UTF-8 en_GB.UTF-8
268localedef -i en_HK -f ISO-8859-1 en_HK
269localedef -i en_PH -f ISO-8859-1 en_PH
270localedef -i en_US -f ISO-8859-1 en_US
271localedef -i en_US -f UTF-8 en_US.UTF-8
272localedef -i es_MX -f ISO-8859-1 es_MX
273localedef -i fa_IR -f UTF-8 fa_IR
274localedef -i fr_FR -f ISO-8859-1 fr_FR
275localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
276localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
277localedef -i it_IT -f ISO-8859-1 it_IT
278localedef -i it_IT -f UTF-8 it_IT.UTF-8
279localedef -i ja_JP -f EUC-JP ja_JP
280localedef -i ja_JP -f SHIFT_JIS ja_JP.SIJS 2> /dev/null || true
281localedef -i ja_JP -f UTF-8 ja_JP.UTF-8
282localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
283localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
284localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
285localedef -i zh_CN -f GB18030 zh_CN.GB18030
286localedef -i zh_HK -f BIG5-HKSCS zh_HK.BIG5-HKSCS</userinput></screen>
287
288 <para>In addition, install the locale for your own country, language and
289 character set.</para>
290
291 <para>Alternatively, install all locales listed in the
292 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
293 (it includes every locale listed above and many more) at once with the
294 following time-consuming command:</para>
295
296<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
297
298 <para>Then use the <command>localedef</command> command to create and
299 install locales not listed in the
300 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
301 when you need them. For instance, the following two locales are
302 needed for some tests later in this chapter:</para>
303
304<screen role="nodump"><userinput remap="locale-full">localedef -i POSIX -f UTF-8 C.UTF-8 2> /dev/null || true
305localedef -i ja_JP -f SHIFT_JIS ja_JP.SIJS 2> /dev/null || true</userinput></screen>
306
307 <note><para>Glibc now uses libidn2 when resolving internationalized
308 domain names. This is a run time dependency. If this capability
309 is needed, the instructions for installing libidn2 are in the
310 <ulink url="&blfs-book;general/libidn2.html">BLFS libidn2 page</ulink>.
311 </para></note>
312
313 </sect2>
314
315 <sect2 id="conf-glibc" role="configuration">
316 <title>Configuring Glibc</title>
317
318 <indexterm zone="conf-glibc">
319 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
320 </indexterm>
321
322 <indexterm zone="conf-glibc">
323 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
324 </indexterm>
325
326 <sect3>
327 <title>Adding nsswitch.conf</title>
328
329 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
330 because the Glibc defaults do not work well in a networked environment.
331 </para>
332
333 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
334 following:</para>
335
336<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
337<literal># Begin /etc/nsswitch.conf
338
339passwd: files
340group: files
341shadow: files
342
343hosts: files dns
344networks: files
345
346protocols: files
347services: files
348ethers: files
349rpc: files
350
351# End /etc/nsswitch.conf</literal>
352EOF</userinput></screen>
353
354 </sect3>
355
356 <sect3>
357 <title>Adding time zone data</title>
358
359 <para>Install and set up the time zone data with the following:</para>
360<screen><userinput>tar -xf ../../tzdata&tzdata-version;.tar.gz
361
362ZONEINFO=/usr/share/zoneinfo
363mkdir -pv $ZONEINFO/{posix,right}
364
365for tz in etcetera southamerica northamerica europe africa antarctica \
366 asia australasia backward; do
367 zic -L /dev/null -d $ZONEINFO ${tz}
368 zic -L /dev/null -d $ZONEINFO/posix ${tz}
369 zic -L leapseconds -d $ZONEINFO/right ${tz}
370done
371
372cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
373zic -d $ZONEINFO -p America/New_York
374unset ZONEINFO</userinput></screen>
375
376 <variablelist>
377 <title>The meaning of the zic commands:</title>
378
379 <varlistentry>
380 <term><parameter>zic -L /dev/null ...</parameter></term>
381 <listitem>
382 <para>This creates posix time zones without any leap seconds. It is
383 conventional to put these in both
384 <filename class="directory">zoneinfo</filename> and
385 <filename class="directory">zoneinfo/posix</filename>. It is
386 necessary to put the POSIX time zones in
387 <filename class="directory">zoneinfo</filename>, otherwise various
388 test-suites will report errors. On an embedded system, where space is
389 tight and you do not intend to ever update the time zones, you could save
390 1.9 MB by not using the <filename class="directory">posix</filename>
391 directory, but some applications or test-suites might produce some
392 failures.</para>
393 </listitem>
394 </varlistentry>
395 <varlistentry>
396 <term><parameter>zic -L leapseconds ...</parameter></term>
397 <listitem>
398 <para>This creates right time zones, including leap seconds. On an
399 embedded system, where space is tight and you do not intend to
400 ever update the time zones, or care about the correct time, you could
401 save 1.9MB by omitting the <filename class="directory">right</filename>
402 directory.</para>
403 </listitem>
404 </varlistentry>
405 <varlistentry>
406 <term><parameter>zic ... -p ...</parameter></term>
407 <listitem>
408 <para>This creates the <filename>posixrules</filename> file. We use
409 New York because POSIX requires the daylight savings time rules
410 to be in accordance with US rules.</para>
411 </listitem>
412 </varlistentry>
413 </variablelist>
414
415
416 <para>One way to determine the local time zone is to run the following
417 script:</para>
418
419<screen role="nodump"><userinput>tzselect</userinput></screen>
420
421 <para>After answering a few questions about the location, the script will
422 output the name of the time zone (e.g.,
423 <emphasis>America/Edmonton</emphasis>). There are also some other possible
424 time zones listed in <filename
425 class='directory'>/usr/share/zoneinfo</filename> such as
426 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
427 are not identified by the script but can be used.</para>
428
429 <para>Then create the <filename>/etc/localtime</filename> file by
430 running:</para>
431
432<screen><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
433
434 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
435 time zone selected (e.g., Canada/Eastern).</para>
436
437 </sect3>
438
439 <sect3 id="conf-ld" role="configuration">
440 <title>Configuring the Dynamic Loader</title>
441
442 <indexterm zone="conf-ld">
443 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
444 </indexterm>
445
446 <para>By default, the dynamic loader (<filename
447 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
448 <filename class="directory">/lib</filename> and <filename
449 class="directory">/usr/lib</filename> for dynamic libraries that are
450 needed by programs as they are run. However, if there are libraries in
451 directories other than <filename class="directory">/lib</filename> and
452 <filename class="directory">/usr/lib</filename>, these need to be added
453 to the <filename>/etc/ld.so.conf</filename> file in order for the
454 dynamic loader to find them. Two directories that are commonly known
455 to contain additional libraries are <filename
456 class="directory">/usr/local/lib</filename> and <filename
457 class="directory">/opt/lib</filename>, so add those directories to the
458 dynamic loader's search path.</para>
459
460 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
461 following:</para>
462
463<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
464<literal># Begin /etc/ld.so.conf
465/usr/local/lib
466/opt/lib
467</literal>
468EOF</userinput></screen>
469
470 <para>If desired, the dynamic loader can also search a directory and
471 include the contents of files found there. Generally the files in
472 this include directory are one line specifying the desired library path.
473 To add this capability run the following commands:</para>
474
475<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
476<literal># Add an include directory
477include /etc/ld.so.conf.d/*.conf
478</literal>
479EOF
480mkdir -pv /etc/ld.so.conf.d</userinput></screen>
481
482 </sect3>
483 </sect2>
484
485 <sect2 id="contents-glibc" role="content">
486 <title>Contents of Glibc</title>
487
488 <segmentedlist>
489 <segtitle>Installed programs</segtitle>
490 <segtitle>Installed libraries</segtitle>
491 <segtitle>Installed directories</segtitle>
492
493 <seglistitem>
494 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
495 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd,
496 pcprofiledump, pldd, sln, sotruss, sprof, tzselect, xtrace,
497 zdump, and zic</seg>
498 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
499 libc.{a,so}, libc_nonshared.a,
500 libcrypt.{a,so}, libdl.{a,so}, libg.a, libm.{a,so},
501 libmcheck.a, libmemusage.so, libmvec.{a,so}, libnsl.{a,so},
502 libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
503 libpcprofile.so, libpthread.{a,so},
504 libpthread_nonshared.a, libresolv.{a,so}, librt.{a,so},
505 libthread_db.so, and libutil.{a,so}</seg>
506 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
507 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
508 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
509 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
510 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
511 /usr/include/protocols, /usr/include/rpc,
512 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
513 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
514 /var/cache/nscd, and /var/lib/nss_db</seg>
515 </seglistitem>
516 </segmentedlist>
517
518 <variablelist>
519 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
520 <?dbfo list-presentation="list"?>
521 <?dbhtml list-presentation="table"?>
522
523 <varlistentry id="catchsegv">
524 <term><command>catchsegv</command></term>
525 <listitem>
526 <para>Can be used to create a stack trace when a program
527 terminates with a segmentation fault</para>
528 <indexterm zone="ch-system-glibc catchsegv">
529 <primary sortas="b-catchsegv">catchsegv</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="gencat">
535 <term><command>gencat</command></term>
536 <listitem>
537 <para>Generates message catalogues</para>
538 <indexterm zone="ch-system-glibc gencat">
539 <primary sortas="b-gencat">gencat</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="getconf">
545 <term><command>getconf</command></term>
546 <listitem>
547 <para>Displays the system configuration values for file system
548 specific variables</para>
549 <indexterm zone="ch-system-glibc getconf">
550 <primary sortas="b-getconf">getconf</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="getent">
556 <term><command>getent</command></term>
557 <listitem>
558 <para>Gets entries from an administrative database</para>
559 <indexterm zone="ch-system-glibc getent">
560 <primary sortas="b-getent">getent</primary>
561 </indexterm>
562 </listitem>
563 </varlistentry>
564
565 <varlistentry id="iconv">
566 <term><command>iconv</command></term>
567 <listitem>
568 <para>Performs character set conversion</para>
569 <indexterm zone="ch-system-glibc iconv">
570 <primary sortas="b-iconv">iconv</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="iconvconfig">
576 <term><command>iconvconfig</command></term>
577 <listitem>
578 <para>Creates fastloading <command>iconv</command> module configuration
579 files</para>
580 <indexterm zone="ch-system-glibc iconvconfig">
581 <primary sortas="b-iconvconfig">iconvconfig</primary>
582 </indexterm>
583 </listitem>
584 </varlistentry>
585
586 <varlistentry id="ldconfig">
587 <term><command>ldconfig</command></term>
588 <listitem>
589 <para>Configures the dynamic linker runtime bindings</para>
590 <indexterm zone="ch-system-glibc ldconfig">
591 <primary sortas="b-ldconfig">ldconfig</primary>
592 </indexterm>
593 </listitem>
594 </varlistentry>
595
596 <varlistentry id="ldd">
597 <term><command>ldd</command></term>
598 <listitem>
599 <para>Reports which shared libraries are required
600 by each given program or shared library</para>
601 <indexterm zone="ch-system-glibc ldd">
602 <primary sortas="b-ldd">ldd</primary>
603 </indexterm>
604 </listitem>
605 </varlistentry>
606
607 <varlistentry id="lddlibc4">
608 <term><command>lddlibc4</command></term>
609 <listitem>
610 <para>Assists <command>ldd</command> with object files</para>
611 <indexterm zone="ch-system-glibc lddlibc4">
612 <primary sortas="b-lddlibc4">lddlibc4</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry>
616
617 <varlistentry id="locale">
618 <term><command>locale</command></term>
619 <listitem>
620 <para>Prints various information about the current locale</para>
621 <indexterm zone="ch-system-glibc locale">
622 <primary sortas="b-locale">locale</primary>
623 </indexterm>
624 </listitem>
625 </varlistentry>
626
627 <varlistentry id="localedef">
628 <term><command>localedef</command></term>
629 <listitem>
630 <para>Compiles locale specifications</para>
631 <indexterm zone="ch-system-glibc localedef">
632 <primary sortas="b-localedef">localedef</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="makedb">
638 <term><command>makedb</command></term>
639 <listitem>
640 <para>Creates a simple database from textual input</para>
641 <indexterm zone="ch-system-glibc makedb">
642 <primary sortas="b-makedb">makedb</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="mtrace">
648 <term><command>mtrace</command></term>
649 <listitem>
650 <para>Reads and interprets a memory trace file and displays a summary
651 in human-readable format</para>
652 <indexterm zone="ch-system-glibc mtrace">
653 <primary sortas="b-mtrace">mtrace</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry>
657
658 <varlistentry id="nscd">
659 <term><command>nscd</command></term>
660 <listitem>
661 <para>A daemon that provides a cache for the most common name
662 service requests</para>
663 <indexterm zone="ch-system-glibc nscd">
664 <primary sortas="b-nscd">nscd</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="pcprofiledump">
670 <term><command>pcprofiledump</command></term>
671 <listitem>
672 <para>Dump information generated by PC profiling</para>
673 <indexterm zone="ch-system-glibc pcprofiledump">
674 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
675 </indexterm>
676 </listitem>
677 </varlistentry>
678
679 <varlistentry id="pldd">
680 <term><command>pldd</command></term>
681 <listitem>
682 <para>Lists dynamic shared objects used by running processes</para>
683 <indexterm zone="ch-system-glibc pldd">
684 <primary sortas="b-pldd">pldd</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="sln">
690 <term><command>sln</command></term>
691 <listitem>
692 <para>A statically linked <command>ln</command> program</para>
693 <indexterm zone="ch-system-glibc sln">
694 <primary sortas="b-sln">sln</primary>
695 </indexterm>
696 </listitem>
697 </varlistentry>
698
699 <varlistentry id="sotruss">
700 <term><command>sotruss</command></term>
701 <listitem>
702 <para>Traces shared library procedure calls of a specified command</para>
703 <indexterm zone="ch-system-glibc sotruss">
704 <primary sortas="b-sotruss">sotruss</primary>
705 </indexterm>
706 </listitem>
707 </varlistentry>
708
709 <varlistentry id="sprof">
710 <term><command>sprof</command></term>
711 <listitem>
712 <para>Reads and displays shared object profiling data</para>
713 <indexterm zone="ch-system-glibc sprof">
714 <primary sortas="b-sprof">sprof</primary>
715 </indexterm>
716 </listitem>
717 </varlistentry>
718
719 <varlistentry id="tzselect">
720 <term><command>tzselect</command></term>
721 <listitem>
722 <para>Asks the user about the location of the system and reports
723 the corresponding time zone description</para>
724 <indexterm zone="ch-system-glibc tzselect">
725 <primary sortas="b-tzselect">tzselect</primary>
726 </indexterm>
727 </listitem>
728 </varlistentry>
729
730 <varlistentry id="xtrace">
731 <term><command>xtrace</command></term>
732 <listitem>
733 <para>Traces the execution of a program by printing the currently
734 executed function</para>
735 <indexterm zone="ch-system-glibc xtrace">
736 <primary sortas="b-xtrace">xtrace</primary>
737 </indexterm>
738 </listitem>
739 </varlistentry>
740
741 <varlistentry id="zdump">
742 <term><command>zdump</command></term>
743 <listitem>
744 <para>The time zone dumper</para>
745 <indexterm zone="ch-system-glibc zdump">
746 <primary sortas="b-zdump">zdump</primary>
747 </indexterm>
748 </listitem>
749 </varlistentry>
750
751 <varlistentry id="zic">
752 <term><command>zic</command></term>
753 <listitem>
754 <para>The time zone compiler</para>
755 <indexterm zone="ch-system-glibc zic">
756 <primary sortas="b-zic">zic</primary>
757 </indexterm>
758 </listitem>
759 </varlistentry>
760
761 <varlistentry id="ld.so">
762 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
763 <listitem>
764 <para>The helper program for shared library executables</para>
765 <indexterm zone="ch-system-glibc ld.so">
766 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="libBrokenLocale">
772 <term><filename class="libraryfile">libBrokenLocale</filename></term>
773 <listitem>
774 <para>Used internally by Glibc as a gross hack to get broken programs
775 (e.g., some Motif applications) running. See comments in
776 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
777 for more information</para>
778 <indexterm zone="ch-system-glibc libBrokenLocale">
779 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
780 </indexterm>
781 </listitem>
782 </varlistentry>
783
784 <varlistentry id="libSegFault">
785 <term><filename class="libraryfile">libSegFault</filename></term>
786 <listitem>
787 <para>The segmentation fault signal handler, used by
788 <command>catchsegv</command></para>
789 <indexterm zone="ch-system-glibc libSegFault">
790 <primary sortas="c-libSegFault">libSegFault</primary>
791 </indexterm>
792 </listitem>
793 </varlistentry>
794
795 <varlistentry id="libanl">
796 <term><filename class="libraryfile">libanl</filename></term>
797 <listitem>
798 <para>An asynchronous name lookup library</para>
799 <indexterm zone="ch-system-glibc libanl">
800 <primary sortas="c-libanl">libanl</primary>
801 </indexterm>
802 </listitem>
803 </varlistentry>
804
805 <varlistentry id="libc">
806 <term><filename class="libraryfile">libc</filename></term>
807 <listitem>
808 <para>The main C library</para>
809 <indexterm zone="ch-system-glibc libc">
810 <primary sortas="c-libc">libc</primary>
811 </indexterm>
812 </listitem>
813 </varlistentry>
814
815 <varlistentry id="libcrypt">
816 <term><filename class="libraryfile">libcrypt</filename></term>
817 <listitem>
818 <para>The cryptography library</para>
819 <indexterm zone="ch-system-glibc libcrypt">
820 <primary sortas="c-libcrypt">libcrypt</primary>
821 </indexterm>
822 </listitem>
823 </varlistentry>
824
825 <varlistentry id="libdl">
826 <term><filename class="libraryfile">libdl</filename></term>
827 <listitem>
828 <para>The dynamic linking interface library</para>
829 <indexterm zone="ch-system-glibc libdl">
830 <primary sortas="c-libdl">libdl</primary>
831 </indexterm>
832 </listitem>
833 </varlistentry>
834
835 <varlistentry id="libg">
836 <term><filename class="libraryfile">libg</filename></term>
837 <listitem>
838 <para>Dummy library containing no functions. Previously was a runtime
839 library for <command>g++</command></para>
840 <indexterm zone="ch-system-glibc libg">
841 <primary sortas="c-libg">libg</primary>
842 </indexterm>
843 </listitem>
844 </varlistentry>
845
846 <varlistentry id="libm">
847 <term><filename class="libraryfile">libm</filename></term>
848 <listitem>
849 <para>The mathematical library</para>
850 <indexterm zone="ch-system-glibc libm">
851 <primary sortas="c-libm">libm</primary>
852 </indexterm>
853 </listitem>
854 </varlistentry>
855
856 <varlistentry id="libmcheck">
857 <term><filename class="libraryfile">libmcheck</filename></term>
858 <listitem>
859 <para>Turns on memory allocation checking when linked to</para>
860 <indexterm zone="ch-system-glibc libmcheck">
861 <primary sortas="c-libmcheck">libmcheck</primary>
862 </indexterm>
863 </listitem>
864 </varlistentry>
865
866 <varlistentry id="libmemusage">
867 <term><filename class="libraryfile">libmemusage</filename></term>
868 <listitem>
869 <para>Used by <command>memusage</command> to help collect
870 information about the memory usage of a program</para>
871 <indexterm zone="ch-system-glibc libmemusage">
872 <primary sortas="c-libmemusage">libmemusage</primary>
873 </indexterm>
874 </listitem>
875 </varlistentry>
876
877 <varlistentry id="libnsl">
878 <term><filename class="libraryfile">libnsl</filename></term>
879 <listitem>
880 <para>The network services library</para>
881 <indexterm zone="ch-system-glibc libnsl">
882 <primary sortas="c-libnsl">libnsl</primary>
883 </indexterm>
884 </listitem>
885 </varlistentry>
886
887 <varlistentry id="libnss">
888 <term><filename class="libraryfile">libnss</filename></term>
889 <listitem>
890 <para>The Name Service Switch libraries, containing functions for
891 resolving host names, user names, group names, aliases, services,
892 protocols, etc.</para>
893 <indexterm zone="ch-system-glibc libnss">
894 <primary sortas="c-libnss">libnss</primary>
895 </indexterm>
896 </listitem>
897 </varlistentry>
898
899 <varlistentry id="libpcprofile">
900 <term><filename class="libraryfile">libpcprofile</filename></term>
901 <listitem>
902 <para>Can be preloaded to PC profile an executable</para>
903 <indexterm zone="ch-system-glibc libpcprofile">
904 <primary sortas="c-libpcprofile">libpcprofile</primary>
905 </indexterm>
906 </listitem>
907 </varlistentry>
908
909 <varlistentry id="libpthread">
910 <term><filename class="libraryfile">libpthread</filename></term>
911 <listitem>
912 <para>The POSIX threads library</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>Contains code for <quote>standard</quote> functions used in
956 many different Unix utilities</para>
957 <indexterm zone="ch-system-glibc libutil">
958 <primary sortas="c-libutil">libutil</primary>
959 </indexterm>
960 </listitem>
961 </varlistentry>
962
963 </variablelist>
964
965 </sect2>
966
967</sect1>
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