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