source: chapter06/glibc.xml@ 6580440

7.8-systemd 7.9-systemd 7.9-systemd-rc1 7.9-systemd-rc2 systemd
Last change on this file since 6580440 was 6580440, checked in by Krejzi <krejzi@…>, 7 years ago

Import trunk.

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/systemd@10908 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-system-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Glibc package contains the main C library. This library provides
27 the basic routines for allocating memory, searching directories, opening and
28 closing files, reading and writing files, string handling, pattern matching,
29 arithmetic, and so on.</para>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-ch6-sbu;</seg>
37 <seg>&glibc-ch6-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <note>
47 <para>Some packages outside of LFS suggest installing GNU libiconv in
48 order to translate data from one encoding to another. The project's
49 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
50 <quote>This library provides an <function>iconv()</function>
51 implementation, for use on systems which don't have one, or whose
52 implementation cannot convert from/to Unicode.</quote> Glibc provides
53 an <function>iconv()</function> implementation and can convert from/to
54 Unicode, therefore libiconv is not required on an LFS system.</para>
55 </note>
56
57 <para>Some of the Glibc programs use non-FHS compilant
58 <filename class="directory">/var/db</filename> directory to store
59 their runtime data. Apply the following patch to make such programs
60 store their runtime data in the FHS-compliant locations:</para>
61
62<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
63
64 <para>The Glibc build system is self-contained and will install
65 perfectly, even though the compiler specs file and linker are still
66 pointing at <filename class="directory">/tools</filename>. The specs
67 and linker cannot be adjusted before the Glibc install because the
68 Glibc autoconf tests would give false results and defeat the goal
69 of achieving a clean build.</para>
70
71 <para>Fix a regression in the package that affects 32-bit architectures:</para>
72
73<screen><userinput remap="pre">sed -e '/ia32/s/^/1:/' \
74 -e '/SSE2/s/^1://' \
75 -i sysdeps/i386/i686/multiarch/mempcpy_chk.S</userinput></screen>
76
77 <para>Fix a potential security issue identified upstream:</para>
78
79<screen><userinput remap="pre">sed -i '/glibc.*pad/{i\ buflen = buflen > pad ? buflen - pad : 0;
80 s/ + pad//}' resolv/nss_dns/dns-host.c</userinput></screen>
81
82 <para>Fix a test case that fails when built using GCC 5:</para>
83
84<screen><userinput remap="pre">sed -e '/tst-audit2-ENV/i CFLAGS-tst-audit2.c += -fno-builtin' \
85 -i elf/Makefile</userinput></screen>
86
87 <para>The Glibc documentation recommends building Glibc outside of the source
88 directory in a dedicated build directory:</para>
89
90<screen><userinput remap="pre">mkdir -v ../glibc-build
91cd ../glibc-build</userinput></screen>
92
93 <para>Prepare Glibc for compilation:</para>
94
95<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
96 --prefix=/usr \
97 --disable-profile \
98 --enable-kernel=&min-kernel; \
99 --enable-obsolete-rpc</userinput></screen>
100
101 <para>Compile the package:</para>
102
103<screen><userinput remap="make">make</userinput></screen>
104
105 <important>
106 <para>In this section, the test suite for Glibc is considered critical.
107 Do not skip it under any circumstance.</para>
108 </important>
109
110 <para>Generally a few tests do not pass, but you can generally ignore
111 any of the test failures listed below. Now test the build results:</para>
112
113<screen><userinput remap="test">make check</userinput></screen>
114
115 <para>You will probably see some test failures. The Glibc test suite is
116 somewhat dependent on the host system. This is a list of the most common
117 issues seen for this version of LFS:</para>
118
119 <itemizedlist>
120
121 <listitem>
122 <para>posix/tst-getaddrinfo4 will always fail
123 due to not having a network connection when the tests are run.</para>
124 </listitem>
125
126 <listitem>
127 <para>The <emphasis>tst/tst-cputimer1</emphasis> and
128 <emphasis>rt/tst-cpuclock2</emphasis> tests have been known to
129 fail. The reason is not completely understood, but indications are
130 that minor timing issues can trigger these failures.</para>
131 </listitem>
132
133 <listitem>
134 <para>The math tests sometimes fail when running on
135 systems where the CPU is not a relatively new genuine Intel or
136 authentic AMD processor.</para>
137 </listitem>
138<!--
139 <listitem>
140 <para>When running on older and slower hardware or on systems under
141 load, some tests can fail because of test timeouts being exceeded.
142 Modifying the make check command to set a TIMEOUTFACTOR is reported to
143 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
144 make -k check</command>).</para>
145 </listitem>
146-->
147<!--
148 <listitem>
149 <para>libio/tst-ftell-partial-wide.out fails because it needs a locale
150 that has not yet been generated.</para>
151 </listitem>
152-->
153 <listitem>
154 <para>Other tests known to fail on some architectures are
155 malloc/tst-malloc-usable and nptl/tst-cleanupx4. </para>
156 </listitem>
157
158 </itemizedlist>
159
160 <para>Though it is a harmless message, the install stage of Glibc will
161 complain about the absence of <filename>/etc/ld.so.conf</filename>.
162 Prevent this warning with:</para>
163
164<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
165
166 <para>Install the package:</para>
167
168<screen><userinput remap="install">make install</userinput></screen>
169
170 <para>Install the configuration file and runtime directory for
171 <command>nscd</command>:</para>
172
173<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
174mkdir -pv /var/cache/nscd</userinput></screen>
175
176 <para>Install the systemd support files for <command>nscd</command>:</para>
177
178<screen><userinput remap="install">install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
179install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
180
181 <para>The locales that can make the system respond in a different language
182 were not installed by the above command. None of the locales are required,
183 but if some of them are missing, test suites of the future packages would
184 skip important testcases.</para>
185
186 <para>Individual locales can be installed using the
187 <command>localedef</command> program. E.g., the first
188 <command>localedef</command> command below combines the
189 <filename>/usr/share/i18n/locales/cs_CZ</filename>
190 charset-independent locale definition with the
191 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
192 charmap definition and appends the result to the
193 <filename>/usr/lib/locale/locale-archive</filename> file.
194 The following instructions will install the minimum set of
195 locales necessary for the optimal coverage of tests:</para>
196
197<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
198localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
199localedef -i de_DE -f ISO-8859-1 de_DE
200localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
201localedef -i de_DE -f UTF-8 de_DE.UTF-8
202localedef -i en_GB -f UTF-8 en_GB.UTF-8
203localedef -i en_HK -f ISO-8859-1 en_HK
204localedef -i en_PH -f ISO-8859-1 en_PH
205localedef -i en_US -f ISO-8859-1 en_US
206localedef -i en_US -f UTF-8 en_US.UTF-8
207localedef -i es_MX -f ISO-8859-1 es_MX
208localedef -i fa_IR -f UTF-8 fa_IR
209localedef -i fr_FR -f ISO-8859-1 fr_FR
210localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
211localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
212localedef -i it_IT -f ISO-8859-1 it_IT
213localedef -i it_IT -f UTF-8 it_IT.UTF-8
214localedef -i ja_JP -f EUC-JP ja_JP
215localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
216localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
217localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
218localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
219
220 <para>In addition, install the locale for your own country, language and
221 character set.</para>
222
223 <para>Alternatively, install all locales listed in the
224 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
225 (it includes every locale listed above and many more) at once with the
226 following time-consuming command:</para>
227
228<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
229
230 <para>Then use the <command>localedef</command> command to create and
231 install locales not listed in the
232 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
233 in the unlikely case you need them.</para>
234
235 </sect2>
236
237 <sect2 id="conf-glibc" role="configuration">
238 <title>Configuring Glibc</title>
239
240 <indexterm zone="conf-glibc">
241 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
242 </indexterm>
243
244 <indexterm zone="conf-glibc">
245 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
246 </indexterm>
247
248 <sect3>
249 <title>Adding nsswitch.conf</title>
250
251 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
252 because the Glibc defaults do not work well in a networked environment.
253 </para>
254
255 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
256 following:</para>
257
258<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
259<literal># Begin /etc/nsswitch.conf
260
261passwd: files
262group: files
263shadow: files
264
265hosts: files dns myhostname
266networks: files
267
268protocols: files
269services: files
270ethers: files
271rpc: files
272
273# End /etc/nsswitch.conf</literal>
274EOF</userinput></screen>
275
276 </sect3>
277
278 <sect3>
279 <title>Adding time zone data</title>
280
281 <para>Install and set up the timezone data with the following:</para>
282<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
283
284ZONEINFO=/usr/share/zoneinfo
285mkdir -pv $ZONEINFO/{posix,right}
286
287for tz in etcetera southamerica northamerica europe africa antarctica \
288 asia australasia backward pacificnew systemv; do
289 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
290 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
291 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
292done
293
294cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
295zic -d $ZONEINFO -p America/New_York
296unset ZONEINFO</userinput></screen>
297
298 <variablelist>
299 <title>The meaning of the zic commands:</title>
300
301 <varlistentry>
302 <term><parameter>zic -L /dev/null ...</parameter></term>
303 <listitem>
304 <para>This creates posix timezones, without any leap seconds. It is
305 conventional to put these in both
306 <filename class="directory">zoneinfo</filename> and
307 <filename class="directory">zoneinfo/posix</filename>. It is
308 necessary to put the POSIX timezones in
309 <filename class="directory">zoneinfo</filename>, otherwise various
310 test-suites will report errors. On an embedded system, where space is
311 tight and you do not intend to ever update the timezones, you could save
312 1.9MB by not using the <filename class="directory">posix</filename>
313 directory, but some applications or test-suites might produce some
314 failures.</para>
315 </listitem>
316 </varlistentry>
317 <varlistentry>
318 <term><parameter>zic -L leapseconds ...</parameter></term>
319 <listitem>
320 <para>This creates right timezones, including leap seconds. On an
321 embedded system, where space is tight and you do not intend to
322 ever update the timezones, or care about the correct time, you could
323 save 1.9MB by omitting the <filename class="directory">right</filename>
324 directory.</para>
325 </listitem>
326 </varlistentry>
327 <varlistentry>
328 <term><parameter>zic ... -p ...</parameter></term>
329 <listitem>
330 <para>This creates the <filename>posixrules</filename> file. We use
331 New York because POSIX requires the daylight savings time rules
332 to be in accordance with US rules.</para>
333 </listitem>
334 </varlistentry>
335 </variablelist>
336
337
338 <para>One way to determine the local time zone is to run the following
339 script:</para>
340
341<screen role="nodump"><userinput>tzselect</userinput></screen>
342
343 <para>After answering a few questions about the location, the script will
344 output the name of the time zone (e.g.,
345 <emphasis>America/Edmonton</emphasis>). There are also some other possible
346 timezones listed in <filename
347 class='directory'>/usr/share/zoneinfo</filename> such as
348 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
349 are not identified by the script but can be used.</para>
350
351 <para>Then create the <filename>/etc/localtime</filename> file by
352 running:</para>
353
354<screen><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
355
356 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
357 time zone selected (e.g., Canada/Eastern).</para>
358
359 </sect3>
360
361 <sect3 id="conf-ld" role="configuration">
362 <title>Configuring the Dynamic Loader</title>
363
364 <indexterm zone="conf-ld">
365 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
366 </indexterm>
367
368 <para>By default, the dynamic loader (<filename
369 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
370 <filename class="directory">/lib</filename> and <filename
371 class="directory">/usr/lib</filename> for dynamic libraries that are
372 needed by programs as they are run. However, if there are libraries in
373 directories other than <filename class="directory">/lib</filename> and
374 <filename class="directory">/usr/lib</filename>, these need to be added
375 to the <filename>/etc/ld.so.conf</filename> file in order for the
376 dynamic loader to find them. Two directories that are commonly known
377 to contain additional libraries are <filename
378 class="directory">/usr/local/lib</filename> and <filename
379 class="directory">/opt/lib</filename>, so add those directories to the
380 dynamic loader's search path.</para>
381
382 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
383 following:</para>
384
385<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
386<literal># Begin /etc/ld.so.conf
387/usr/local/lib
388/opt/lib
389</literal>
390EOF</userinput></screen>
391
392 <para>If desired, the dynamic loader can also search a directory and
393 include the contents of files found there. Generally the files in
394 this include directory are one line specifying the desired library path.
395 To add this capability run the following commands:</para>
396
397<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
398<literal># Add an include directory
399include /etc/ld.so.conf.d/*.conf
400</literal>
401EOF
402mkdir -pv /etc/ld.so.conf.d</userinput></screen>
403
404 </sect3>
405 </sect2>
406
407 <sect2 id="contents-glibc" role="content">
408 <title>Contents of Glibc</title>
409
410 <segmentedlist>
411 <segtitle>Installed programs</segtitle>
412 <segtitle>Installed libraries</segtitle>
413 <segtitle>Installed directories</segtitle>
414
415 <seglistitem>
416 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
417 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
418 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
419 zdump, and zic</seg>
420 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
421 libc.{a,so}, libc_nonshared.a, libcidn.so,
422 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
423 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
424 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
425 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
426 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
427 libthread_db.so, and libutil.{a,so}</seg>
428 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
429 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
430 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
431 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
432 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
433 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
434 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
435 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
436 /var/cache/nscd, and /var/lib/nss_db</seg>
437 </seglistitem>
438 </segmentedlist>
439
440 <variablelist>
441 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
442 <?dbfo list-presentation="list"?>
443 <?dbhtml list-presentation="table"?>
444
445 <varlistentry id="catchsegv">
446 <term><command>catchsegv</command></term>
447 <listitem>
448 <para>Can be used to create a stack trace when a program
449 terminates with a segmentation fault</para>
450 <indexterm zone="ch-system-glibc catchsegv">
451 <primary sortas="b-catchsegv">catchsegv</primary>
452 </indexterm>
453 </listitem>
454 </varlistentry>
455
456 <varlistentry id="gencat">
457 <term><command>gencat</command></term>
458 <listitem>
459 <para>Generates message catalogues</para>
460 <indexterm zone="ch-system-glibc gencat">
461 <primary sortas="b-gencat">gencat</primary>
462 </indexterm>
463 </listitem>
464 </varlistentry>
465
466 <varlistentry id="getconf">
467 <term><command>getconf</command></term>
468 <listitem>
469 <para>Displays the system configuration values for file system
470 specific variables</para>
471 <indexterm zone="ch-system-glibc getconf">
472 <primary sortas="b-getconf">getconf</primary>
473 </indexterm>
474 </listitem>
475 </varlistentry>
476
477 <varlistentry id="getent">
478 <term><command>getent</command></term>
479 <listitem>
480 <para>Gets entries from an administrative database</para>
481 <indexterm zone="ch-system-glibc getent">
482 <primary sortas="b-getent">getent</primary>
483 </indexterm>
484 </listitem>
485 </varlistentry>
486
487 <varlistentry id="iconv">
488 <term><command>iconv</command></term>
489 <listitem>
490 <para>Performs character set conversion</para>
491 <indexterm zone="ch-system-glibc iconv">
492 <primary sortas="b-iconv">iconv</primary>
493 </indexterm>
494 </listitem>
495 </varlistentry>
496
497 <varlistentry id="iconvconfig">
498 <term><command>iconvconfig</command></term>
499 <listitem>
500 <para>Creates fastloading <command>iconv</command> module configuration
501 files</para>
502 <indexterm zone="ch-system-glibc iconvconfig">
503 <primary sortas="b-iconvconfig">iconvconfig</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="ldconfig">
509 <term><command>ldconfig</command></term>
510 <listitem>
511 <para>Configures the dynamic linker runtime bindings</para>
512 <indexterm zone="ch-system-glibc ldconfig">
513 <primary sortas="b-ldconfig">ldconfig</primary>
514 </indexterm>
515 </listitem>
516 </varlistentry>
517
518 <varlistentry id="ldd">
519 <term><command>ldd</command></term>
520 <listitem>
521 <para>Reports which shared libraries are required
522 by each given program or shared library</para>
523 <indexterm zone="ch-system-glibc ldd">
524 <primary sortas="b-ldd">ldd</primary>
525 </indexterm>
526 </listitem>
527 </varlistentry>
528
529 <varlistentry id="lddlibc4">
530 <term><command>lddlibc4</command></term>
531 <listitem>
532 <para>Assists <command>ldd</command> with object files</para>
533 <indexterm zone="ch-system-glibc lddlibc4">
534 <primary sortas="b-lddlibc4">lddlibc4</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="locale">
540 <term><command>locale</command></term>
541 <listitem>
542 <para>Prints various information about the current locale</para>
543 <indexterm zone="ch-system-glibc locale">
544 <primary sortas="b-locale">locale</primary>
545 </indexterm>
546 </listitem>
547 </varlistentry>
548
549 <varlistentry id="localedef">
550 <term><command>localedef</command></term>
551 <listitem>
552 <para>Compiles locale specifications</para>
553 <indexterm zone="ch-system-glibc localedef">
554 <primary sortas="b-localedef">localedef</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="makedb">
560 <term><command>makedb</command></term>
561 <listitem>
562 <para>Creates a simple database from textual input</para>
563 <indexterm zone="ch-system-glibc makedb">
564 <primary sortas="b-makedb">makedb</primary>
565 </indexterm>
566 </listitem>
567 </varlistentry>
568
569 <varlistentry id="mtrace">
570 <term><command>mtrace</command></term>
571 <listitem>
572 <para>Reads and interprets a memory trace file and displays a summary
573 in human-readable format</para>
574 <indexterm zone="ch-system-glibc mtrace">
575 <primary sortas="b-mtrace">mtrace</primary>
576 </indexterm>
577 </listitem>
578 </varlistentry>
579
580 <varlistentry id="nscd">
581 <term><command>nscd</command></term>
582 <listitem>
583 <para>A daemon that provides a cache for the most common name
584 service requests</para>
585 <indexterm zone="ch-system-glibc nscd">
586 <primary sortas="b-nscd">nscd</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="pcprofiledump">
592 <term><command>pcprofiledump</command></term>
593 <listitem>
594 <para>Dumps information generated by PC profiling</para>
595 <indexterm zone="ch-system-glibc pcprofiledump">
596 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
597 </indexterm>
598 </listitem>
599 </varlistentry>
600
601 <varlistentry id="pldd">
602 <term><command>pldd</command></term>
603 <listitem>
604 <para>Lists dynamic shared objects used by running processes</para>
605 <indexterm zone="ch-system-glibc pldd">
606 <primary sortas="b-pldd">pldd</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610<!--
611 <varlistentry id="pt_chown">
612 <term><command>pt_chown</command></term>
613 <listitem>
614 <para>A helper program for <command>grantpt</command> to set the owner,
615 group and access permissions of a slave pseudo terminal</para>
616 <indexterm zone="ch-system-glibc pt_chown">
617 <primary sortas="b-pt_chown">pt_chown</primary>
618 </indexterm>
619 </listitem>
620 </varlistentry>
621-->
622 <varlistentry id="rpcgen">
623 <term><command>rpcgen</command></term>
624 <listitem>
625 <para>Generates C code to implement the Remote Procedure Call (RPC)
626 protocol</para>
627 <indexterm zone="ch-system-glibc rpcgen">
628 <primary sortas="b-rpcgen">rpcgen</primary>
629 </indexterm>
630 </listitem>
631 </varlistentry>
632
633 <varlistentry id="sln">
634 <term><command>sln</command></term>
635 <listitem>
636 <para>A statically linked <command>ln</command> program</para>
637 <indexterm zone="ch-system-glibc sln">
638 <primary sortas="b-sln">sln</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 <varlistentry id="sotruss">
644 <term><command>sotruss</command></term>
645 <listitem>
646 <para>Traces shared library procedure calls of a specified command</para>
647 <indexterm zone="ch-system-glibc sotruss">
648 <primary sortas="b-sotruss">sotruss</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="sprof">
654 <term><command>sprof</command></term>
655 <listitem>
656 <para>Reads and displays shared object profiling data</para>
657 <indexterm zone="ch-system-glibc sprof">
658 <primary sortas="b-sprof">sprof</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="tzselect">
664 <term><command>tzselect</command></term>
665 <listitem>
666 <para>Asks the user about the location of the system and reports
667 the corresponding time zone description</para>
668 <indexterm zone="ch-system-glibc tzselect">
669 <primary sortas="b-tzselect">tzselect</primary>
670 </indexterm>
671 </listitem>
672 </varlistentry>
673
674 <varlistentry id="xtrace">
675 <term><command>xtrace</command></term>
676 <listitem>
677 <para>Traces the execution of a program by printing the currently
678 executed function</para>
679 <indexterm zone="ch-system-glibc xtrace">
680 <primary sortas="b-xtrace">xtrace</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="zdump">
686 <term><command>zdump</command></term>
687 <listitem>
688 <para>The time zone dumper</para>
689 <indexterm zone="ch-system-glibc zdump">
690 <primary sortas="b-zdump">zdump</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="zic">
696 <term><command>zic</command></term>
697 <listitem>
698 <para>The time zone compiler</para>
699 <indexterm zone="ch-system-glibc zic">
700 <primary sortas="b-zic">zic</primary>
701 </indexterm>
702 </listitem>
703 </varlistentry>
704
705 <varlistentry id="ld.so">
706 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
707 <listitem>
708 <para>The helper program for shared library executables</para>
709 <indexterm zone="ch-system-glibc ld.so">
710 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
711 </indexterm>
712 </listitem>
713 </varlistentry>
714
715 <varlistentry id="libBrokenLocale">
716 <term><filename class="libraryfile">libBrokenLocale</filename></term>
717 <listitem>
718 <para>Used internally by Glibc as a gross hack to get broken programs
719 (e.g., some Motif applications) running. See comments in
720 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
721 for more information</para>
722 <indexterm zone="ch-system-glibc libBrokenLocale">
723 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
724 </indexterm>
725 </listitem>
726 </varlistentry>
727
728 <varlistentry id="libSegFault">
729 <term><filename class="libraryfile">libSegFault</filename></term>
730 <listitem>
731 <para>The segmentation fault signal handler, used by
732 <command>catchsegv</command></para>
733 <indexterm zone="ch-system-glibc libSegFault">
734 <primary sortas="c-libSegFault">libSegFault</primary>
735 </indexterm>
736 </listitem>
737 </varlistentry>
738
739 <varlistentry id="libanl">
740 <term><filename class="libraryfile">libanl</filename></term>
741 <listitem>
742 <para>An asynchronous name lookup library</para>
743 <indexterm zone="ch-system-glibc libanl">
744 <primary sortas="c-libanl">libanl</primary>
745 </indexterm>
746 </listitem>
747 </varlistentry>
748
749 <varlistentry id="libc">
750 <term><filename class="libraryfile">libc</filename></term>
751 <listitem>
752 <para>The main C library</para>
753 <indexterm zone="ch-system-glibc libc">
754 <primary sortas="c-libc">libc</primary>
755 </indexterm>
756 </listitem>
757 </varlistentry>
758
759 <varlistentry id="libcidn">
760 <term><filename class="libraryfile">libcidn</filename></term>
761 <listitem>
762 <para>Used internally by Glibc for handling internationalized domain
763 names in the <function>getaddrinfo()</function> function</para>
764 <indexterm zone="ch-system-glibc libcidn">
765 <primary sortas="c-libcidn">libcidn</primary>
766 </indexterm>
767 </listitem>
768 </varlistentry>
769
770 <varlistentry id="libcrypt">
771 <term><filename class="libraryfile">libcrypt</filename></term>
772 <listitem>
773 <para>The cryptography library</para>
774 <indexterm zone="ch-system-glibc libcrypt">
775 <primary sortas="c-libcrypt">libcrypt</primary>
776 </indexterm>
777 </listitem>
778 </varlistentry>
779
780 <varlistentry id="libdl">
781 <term><filename class="libraryfile">libdl</filename></term>
782 <listitem>
783 <para>The dynamic linking interface library</para>
784 <indexterm zone="ch-system-glibc libdl">
785 <primary sortas="c-libdl">libdl</primary>
786 </indexterm>
787 </listitem>
788 </varlistentry>
789
790 <varlistentry id="libg">
791 <term><filename class="libraryfile">libg</filename></term>
792 <listitem>
793 <para>Dummy library containing no functions. Previously was a runtime
794 library for <command>g++</command></para>
795 <indexterm zone="ch-system-glibc libg">
796 <primary sortas="c-libg">libg</primary>
797 </indexterm>
798 </listitem>
799 </varlistentry>
800
801 <varlistentry id="libieee">
802 <term><filename class="libraryfile">libieee</filename></term>
803 <listitem>
804 <para>Linking in this module forces error handling rules for math
805 functions as defined by the Institute of Electrical and Electronic
806 Engineers (IEEE). The default is POSIX.1 error handling</para>
807 <indexterm zone="ch-system-glibc libieee">
808 <primary sortas="c-libieee">libieee</primary>
809 </indexterm>
810 </listitem>
811 </varlistentry>
812
813 <varlistentry id="libm">
814 <term><filename class="libraryfile">libm</filename></term>
815 <listitem>
816 <para>The mathematical library</para>
817 <indexterm zone="ch-system-glibc libm">
818 <primary sortas="c-libm">libm</primary>
819 </indexterm>
820 </listitem>
821 </varlistentry>
822
823 <varlistentry id="libmcheck">
824 <term><filename class="libraryfile">libmcheck</filename></term>
825 <listitem>
826 <para>Turns on memory allocation checking when linked to</para>
827 <indexterm zone="ch-system-glibc libmcheck">
828 <primary sortas="c-libmcheck">libmcheck</primary>
829 </indexterm>
830 </listitem>
831 </varlistentry>
832
833 <varlistentry id="libmemusage">
834 <term><filename class="libraryfile">libmemusage</filename></term>
835 <listitem>
836 <para>Used by <command>memusage</command> to help collect
837 information about the memory usage of a program</para>
838 <indexterm zone="ch-system-glibc libmemusage">
839 <primary sortas="c-libmemusage">libmemusage</primary>
840 </indexterm>
841 </listitem>
842 </varlistentry>
843
844 <varlistentry id="libnsl">
845 <term><filename class="libraryfile">libnsl</filename></term>
846 <listitem>
847 <para>The network services library</para>
848 <indexterm zone="ch-system-glibc libnsl">
849 <primary sortas="c-libnsl">libnsl</primary>
850 </indexterm>
851 </listitem>
852 </varlistentry>
853
854 <varlistentry id="libnss">
855 <term><filename class="libraryfile">libnss</filename></term>
856 <listitem>
857 <para>The Name Service Switch libraries, containing functions for
858 resolving host names, user names, group names, aliases, services,
859 protocols, etc.</para>
860 <indexterm zone="ch-system-glibc libnss">
861 <primary sortas="c-libnss">libnss</primary>
862 </indexterm>
863 </listitem>
864 </varlistentry>
865
866 <varlistentry id="libpcprofile">
867 <term><filename class="libraryfile">libpcprofile</filename></term>
868 <listitem>
869 <para>Contains profiling functions used to track the amount of CPU
870 time spent in specific source code lines</para>
871 <indexterm zone="ch-system-glibc libpcprofile">
872 <primary sortas="c-libpcprofile">libpcprofile</primary>
873 </indexterm>
874 </listitem>
875 </varlistentry>
876
877 <varlistentry id="libpthread">
878 <term><filename class="libraryfile">libpthread</filename></term>
879 <listitem>
880 <para>The POSIX threads library</para>
881 <indexterm zone="ch-system-glibc libpthread">
882 <primary sortas="c-libpthread">libpthread</primary>
883 </indexterm>
884 </listitem>
885 </varlistentry>
886
887 <varlistentry id="libresolv">
888 <term><filename class="libraryfile">libresolv</filename></term>
889 <listitem>
890 <para>Contains functions for creating, sending, and interpreting
891 packets to the Internet domain name servers</para>
892 <indexterm zone="ch-system-glibc libresolv">
893 <primary sortas="c-libresolv">libresolv</primary>
894 </indexterm>
895 </listitem>
896 </varlistentry>
897
898 <varlistentry id="librpcsvc">
899 <term><filename class="libraryfile">librpcsvc</filename></term>
900 <listitem>
901 <para>Contains functions providing miscellaneous RPC services</para>
902 <indexterm zone="ch-system-glibc librpcsvc">
903 <primary sortas="c-librpcsvc">librpcsvc</primary>
904 </indexterm>
905 </listitem>
906 </varlistentry>
907
908 <varlistentry id="librt">
909 <term><filename class="libraryfile">librt</filename></term>
910 <listitem>
911 <para>Contains functions providing most of the interfaces specified
912 by the POSIX.1b Realtime Extension</para>
913 <indexterm zone="ch-system-glibc librt">
914 <primary sortas="c-librt">librt</primary>
915 </indexterm>
916 </listitem>
917 </varlistentry>
918
919 <varlistentry id="libthread_db">
920 <term><filename class="libraryfile">libthread_db</filename></term>
921 <listitem>
922 <para>Contains functions useful for building debuggers for
923 multi-threaded programs</para>
924 <indexterm zone="ch-system-glibc libthread_db">
925 <primary sortas="c-libthread_db">libthread_db</primary>
926 </indexterm>
927 </listitem>
928 </varlistentry>
929
930 <varlistentry id="libutil">
931 <term><filename class="libraryfile">libutil</filename></term>
932 <listitem>
933 <para>Contains code for <quote>standard</quote> functions used in
934 many different Unix utilities</para>
935 <indexterm zone="ch-system-glibc libutil">
936 <primary sortas="c-libutil">libutil</primary>
937 </indexterm>
938 </listitem>
939 </varlistentry>
940
941 </variablelist>
942
943 </sect2>
944
945</sect1>
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