source: chapter06/glibc.xml@ f8756ab

7.5-systemd 7.6-systemd 7.7-systemd 7.8-systemd 7.9-systemd
Last change on this file since f8756ab was f8756ab, checked in by Krejzi <krejzi@…>, 10 years ago

Merge latest LFS SVN.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/branches/systemd/BOOK@10468 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>First fix a minor problem when installing the tzselect script:</para>
58
59<screen><userinput remap="pre">sed -i 's/\\$$(pwd)/`pwd`/' timezone/Makefile</userinput></screen>
60
61 <para>The Glibc build system is self-contained and will install
62 perfectly, even though the compiler specs file and linker are still
63 pointing at <filename class="directory">/tools</filename>. The specs
64 and linker cannot be adjusted before the Glibc install because the
65 Glibc autoconf tests would give false results and defeat the goal
66 of achieving a clean build.</para>
67
68 <para>Some of the Glibc programs use non-FHS compilant
69 <filename class="directory">/var/db</filename> directory to store
70 their runtime data. Apply the following patch to make such programs
71 store their runtime data in the FHS-compliant locations:</para>
72
73<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
74
75 <para>The Glibc documentation recommends building Glibc outside of the source
76 directory in a dedicated build directory:</para>
77
78<screen><userinput remap="pre">mkdir -v ../glibc-build
79cd ../glibc-build</userinput></screen>
80
81 <para>Prepare Glibc for compilation:</para>
82
83<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
84 --prefix=/usr \
85 --disable-profile \
86 --enable-kernel=&min-kernel; \
87 --libexecdir=/usr/lib \
88 --enable-obsolete-rpc</userinput></screen>
89
90 <variablelist>
91 <title>The meaning of the new configure options:</title>
92
93 <varlistentry>
94 <term><parameter>--libexecdir=/usr/lib</parameter></term>
95 <listitem>
96 <para>This changes the location of some auxillary files from the
97 default of <filename class="directory">/usr/libexec</filename> to
98 <filename class="directory">/usr/lib</filename>.</para>
99 </listitem>
100 </varlistentry>
101
102 <varlistentry>
103 <term><parameter>--enable-obsolete-rpc</parameter></term>
104 <listitem>
105 <para>Installs NIS and RPC related headers that are not installed by
106 default; these are required to rebuild Glibc and by several BLFS
107 packages.</para>
108 </listitem>
109 </varlistentry>
110
111 </variablelist>
112
113 <para>Compile the package:</para>
114
115<screen><userinput remap="make">make</userinput></screen>
116
117 <important>
118 <para>In this section, the test suite for Glibc is considered critical.
119 Do not skip it under any circumstance.</para>
120 </important>
121
122 <para>Generally a few tests do not pass, but you can generally ignore
123 any of the test failures listed below. Now test the build results:</para>
124
125<screen><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log
126grep Error glibc-check-log</userinput></screen>
127
128 <para>You will probably see an expected (ignored) failure in the
129 <emphasis>posix/annexc</emphasis> and
130 <emphasis>conform/run-conformtest</emphasis> tests. In addition the Glibc
131 test suite is somewhat dependent on the host system. This is a list of the
132 most common issues:</para>
133
134 <itemizedlist>
135
136 <listitem>
137 <para>The <emphasis>nptl/tst-clock2</emphasis>,
138 <emphasis>nptl/tst-attr3</emphasis>,
139 <emphasis>tst/tst-cputimer1</emphasis>, and
140 <emphasis>rt/tst-cpuclock2</emphasis>
141 tests have been known to fail. The
142 reason is not completely understood, but indications are that minor
143 timing issues can trigger these failures.</para>
144 </listitem>
145
146 <listitem>
147 <para>The math tests sometimes fail when running on
148 systems where the CPU is not a relatively new genuine Intel or
149 authentic AMD processor.</para>
150 </listitem>
151
152 <listitem>
153 <para>When running on older and slower hardware or on systems under
154 load, some tests can fail because of test timeouts being exceeded.
155 Modifying the make check command to set a TIMEOUTFACTOR is reported to
156 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
157 make -k check</command>).</para>
158 </listitem>
159
160 <listitem>
161 <para>posix/tst-getaddrinfo4 will always fail due to not having a network
162 connection when the test is run.</para>
163 </listitem>
164
165 <listitem>
166 <para>Other tests known to fail on some architectures are posix/bug-regex32,
167 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, and stdio-common/bug22.</para>
168 </listitem>
169
170 </itemizedlist>
171
172 <para>Though it is a harmless message, the install stage of Glibc will
173 complain about the absence of <filename>/etc/ld.so.conf</filename>.
174 Prevent this warning with:</para>
175
176<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
177
178 <para>Install the package:</para>
179
180<screen><userinput remap="install">make install</userinput></screen>
181
182 <para>Install the configuration file and runtime directory for
183 <command>nscd</command>:</para>
184
185<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
186mkdir -pv /var/cache/nscd</userinput></screen>
187
188 <para>Install the Systemd support files for <command>nscd</command>:</para>
189
190<screen><userinput remap="install">install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.tmpfiles /etc/tmpfiles.d/nscd.conf
191install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
192
193 <para>The locales that can make the system respond in a different language
194 were not installed by the above command. None of the locales are required,
195 but if some of them are missing, test suites of the future packages would
196 skip important testcases.</para>
197
198 <para>Individual locales can be installed using the
199 <command>localedef</command> program. E.g., the first
200 <command>localedef</command> command below combines the
201 <filename>/usr/share/i18n/locales/cs_CZ</filename>
202 charset-independent locale definition with the
203 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
204 charmap definition and appends the result to the
205 <filename>/usr/lib/locale/locale-archive</filename> file.
206 The following instructions will install the minimum set of
207 locales necessary for the optimal coverage of tests:</para>
208
209<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
210localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
211localedef -i de_DE -f ISO-8859-1 de_DE
212localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
213localedef -i de_DE -f UTF-8 de_DE.UTF-8
214localedef -i en_GB -f UTF-8 en_GB.UTF-8
215localedef -i en_HK -f ISO-8859-1 en_HK
216localedef -i en_PH -f ISO-8859-1 en_PH
217localedef -i en_US -f ISO-8859-1 en_US
218localedef -i en_US -f UTF-8 en_US.UTF-8
219localedef -i es_MX -f ISO-8859-1 es_MX
220localedef -i fa_IR -f UTF-8 fa_IR
221localedef -i fr_FR -f ISO-8859-1 fr_FR
222localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
223localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
224localedef -i it_IT -f ISO-8859-1 it_IT
225localedef -i it_IT -f UTF-8 it_IT.UTF-8
226localedef -i ja_JP -f EUC-JP ja_JP
227localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
228localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
229localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
230localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
231
232 <para>In addition, install the locale for your own country, language and
233 character set.</para>
234
235 <para>Alternatively, install all locales listed in the
236 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
237 (it includes every locale listed above and many more) at once with the
238 following time-consuming command:</para>
239
240<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
241
242 <para>Then use the <command>localedef</command> command to create and
243 install locales not listed in the
244 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
245 in the unlikely case you need them.</para>
246
247 </sect2>
248
249 <sect2 id="conf-glibc" role="configuration">
250 <title>Configuring Glibc</title>
251
252 <indexterm zone="conf-glibc">
253 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
254 </indexterm>
255
256 <indexterm zone="conf-glibc">
257 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
258 </indexterm>
259
260 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
261 because, although Glibc provides defaults when this file is missing or corrupt,
262 the Glibc defaults do not work well in a networked environment. The time zone
263 also needs to be configured.</para>
264
265 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
266 following:</para>
267
268<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
269<literal># Begin /etc/nsswitch.conf
270
271passwd: files
272group: files
273shadow: files
274
275hosts: files dns myhostname
276networks: files
277
278protocols: files
279services: files
280ethers: files
281rpc: files
282
283# End /etc/nsswitch.conf</literal>
284EOF</userinput></screen>
285
286 <para>Install timezone data:</para>
287<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
288
289ZONEINFO=/usr/share/zoneinfo
290mkdir -pv $ZONEINFO/{posix,right}
291
292for tz in etcetera southamerica northamerica europe africa antarctica \
293 asia australasia backward pacificnew systemv; do
294 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
295 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
296 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
297done
298
299cp -v zone.tab iso3166.tab $ZONEINFO
300zic -d $ZONEINFO -p America/New_York
301unset ZONEINFO</userinput></screen>
302
303 <variablelist>
304 <title>The meaning of the zic commands:</title>
305
306 <varlistentry>
307 <term><parameter>zic -L /dev/null ...</parameter></term>
308 <listitem>
309 <para>This creates posix timezones, without any leap seconds. It is
310 conventional to put these in both
311 <filename class="directory">zoneinfo</filename> and
312 <filename class="directory">zoneinfo/posix</filename>. It is
313 necessary to put the POSIX timezones in
314 <filename class="directory">zoneinfo</filename>, otherwise various
315 test-suites will report errors. On an embedded system, where space is
316 tight and you do not intend to ever update the timezones, you could save
317 1.9MB by not using the <filename class="directory">posix</filename>
318 directory, but some applications or test-suites might give less good
319 results</para>
320 </listitem>
321 </varlistentry>
322 <varlistentry>
323 <term><parameter>zic -L leapseconds ...</parameter></term>
324 <listitem>
325 <para>This creates right timezones, including leap seconds. On an
326 embedded system, where space is tight and you do not intend to
327 ever update the timezones, or care about the correct time, you could
328 save 1.9MB by omitting the <filename class="directory">right</filename>
329 directory.</para>
330 </listitem>
331 </varlistentry>
332 <varlistentry>
333 <term><parameter>zic ... -p ...</parameter></term>
334 <listitem>
335 <para>This creates the <filename>posixrules</filename> file. We use
336 New York because POSIX requires the daylight savings time rules
337 to be in accordance with US rules.</para>
338 </listitem>
339 </varlistentry>
340 </variablelist>
341
342
343 <para>One way to determine the local time zone is to run the following
344 script:</para>
345
346<screen role="nodump"><userinput>tzselect</userinput></screen>
347
348 <para>After answering a few questions about the location, the script will
349 output the name of the time zone (e.g.,
350 <emphasis>America/Edmonton</emphasis>). There are also some other possible
351 timezones listed in <filename
352 class='directory'>/usr/share/zoneinfo</filename> such as
353 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
354 are not identified by the script but can be used.</para>
355
356 <para>Then create the <filename>/etc/localtime</filename> file by
357 running:</para>
358
359<screen><userinput>ln -sv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
360
361 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
362 time zone selected (e.g., Canada/Eastern).</para>
363
364 </sect2>
365
366 <sect2 id="conf-ld" role="configuration">
367 <title>Configuring the Dynamic Loader</title>
368
369 <indexterm zone="conf-ld">
370 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
371 </indexterm>
372
373 <para>By default, the dynamic loader (<filename
374 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
375 <filename class="directory">/lib</filename> and <filename
376 class="directory">/usr/lib</filename> for dynamic libraries that are
377 needed by programs as they are run. However, if there are libraries in
378 directories other than <filename class="directory">/lib</filename> and
379 <filename class="directory">/usr/lib</filename>, these need to be added
380 to the <filename>/etc/ld.so.conf</filename> file in order for the
381 dynamic loader to find them. Two directories that are commonly known
382 to contain additional libraries are <filename
383 class="directory">/usr/local/lib</filename> and <filename
384 class="directory">/opt/lib</filename>, so add those directories to the
385 dynamic loader's search path.</para>
386
387 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
388 following:</para>
389
390<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
391<literal># Begin /etc/ld.so.conf
392/usr/local/lib
393/opt/lib
394</literal>
395EOF</userinput></screen>
396
397 <para>If desired, the dynamic loader can also search a directory and
398 include the contents of files found there. Generally the files in
399 this include directory are one line specifying the desired library path.
400 To add this capability run the following commands:</para>
401
402<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
403<literal># Add an include directory
404include /etc/ld.so.conf.d/*.conf
405</literal>
406EOF
407mkdir -pv /etc/ld.so.conf.d</userinput></screen>
408
409 </sect2>
410
411 <sect2 id="contents-glibc" role="content">
412 <title>Contents of Glibc</title>
413
414 <segmentedlist>
415 <segtitle>Installed programs</segtitle>
416 <segtitle>Installed libraries</segtitle>
417 <segtitle>Installed directories</segtitle>
418
419 <seglistitem>
420 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
421 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
422 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
423 zdump, and zic</seg>
424 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
425 libc.{a,so}, libc_nonshared.a, libcidn.so,
426 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
427 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
428 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
429 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
430 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
431 libthread_db.so, and libutil.{a,so}</seg>
432 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
433 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
434 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
435 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
436 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
437 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
438 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/getconf,
439 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo, /var/cache/nscd,
440 and /var/lib/nss_db</seg>
441 </seglistitem>
442 </segmentedlist>
443
444 <variablelist>
445 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
446 <?dbfo list-presentation="list"?>
447 <?dbhtml list-presentation="table"?>
448
449 <varlistentry id="catchsegv">
450 <term><command>catchsegv</command></term>
451 <listitem>
452 <para>Can be used to create a stack trace when a program
453 terminates with a segmentation fault</para>
454 <indexterm zone="ch-system-glibc catchsegv">
455 <primary sortas="b-catchsegv">catchsegv</primary>
456 </indexterm>
457 </listitem>
458 </varlistentry>
459
460 <varlistentry id="gencat">
461 <term><command>gencat</command></term>
462 <listitem>
463 <para>Generates message catalogues</para>
464 <indexterm zone="ch-system-glibc gencat">
465 <primary sortas="b-gencat">gencat</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="getconf">
471 <term><command>getconf</command></term>
472 <listitem>
473 <para>Displays the system configuration values for file system
474 specific variables</para>
475 <indexterm zone="ch-system-glibc getconf">
476 <primary sortas="b-getconf">getconf</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="getent">
482 <term><command>getent</command></term>
483 <listitem>
484 <para>Gets entries from an administrative database</para>
485 <indexterm zone="ch-system-glibc getent">
486 <primary sortas="b-getent">getent</primary>
487 </indexterm>
488 </listitem>
489 </varlistentry>
490
491 <varlistentry id="iconv">
492 <term><command>iconv</command></term>
493 <listitem>
494 <para>Performs character set conversion</para>
495 <indexterm zone="ch-system-glibc iconv">
496 <primary sortas="b-iconv">iconv</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="iconvconfig">
502 <term><command>iconvconfig</command></term>
503 <listitem>
504 <para>Creates fastloading <command>iconv</command> module configuration
505 files</para>
506 <indexterm zone="ch-system-glibc iconvconfig">
507 <primary sortas="b-iconvconfig">iconvconfig</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="ldconfig">
513 <term><command>ldconfig</command></term>
514 <listitem>
515 <para>Configures the dynamic linker runtime bindings</para>
516 <indexterm zone="ch-system-glibc ldconfig">
517 <primary sortas="b-ldconfig">ldconfig</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="ldd">
523 <term><command>ldd</command></term>
524 <listitem>
525 <para>Reports which shared libraries are required
526 by each given program or shared library</para>
527 <indexterm zone="ch-system-glibc ldd">
528 <primary sortas="b-ldd">ldd</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="lddlibc4">
534 <term><command>lddlibc4</command></term>
535 <listitem>
536 <para>Assists <command>ldd</command> with object files</para>
537 <indexterm zone="ch-system-glibc lddlibc4">
538 <primary sortas="b-lddlibc4">lddlibc4</primary>
539 </indexterm>
540 </listitem>
541 </varlistentry>
542
543 <varlistentry id="locale">
544 <term><command>locale</command></term>
545 <listitem>
546 <para>Prints various information about the current locale</para>
547 <indexterm zone="ch-system-glibc locale">
548 <primary sortas="b-locale">locale</primary>
549 </indexterm>
550 </listitem>
551 </varlistentry>
552
553 <varlistentry id="localedef">
554 <term><command>localedef</command></term>
555 <listitem>
556 <para>Compiles locale specifications</para>
557 <indexterm zone="ch-system-glibc localedef">
558 <primary sortas="b-localedef">localedef</primary>
559 </indexterm>
560 </listitem>
561 </varlistentry>
562
563 <varlistentry id="makedb">
564 <term><command>makedb</command></term>
565 <listitem>
566 <para>Creates a simple database from textual input</para>
567 <indexterm zone="ch-system-glibc makedb">
568 <primary sortas="b-makedb">makedb</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="mtrace">
574 <term><command>mtrace</command></term>
575 <listitem>
576 <para>Reads and interprets a memory trace file and displays a summary
577 in human-readable format</para>
578 <indexterm zone="ch-system-glibc mtrace">
579 <primary sortas="b-mtrace">mtrace</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="nscd">
585 <term><command>nscd</command></term>
586 <listitem>
587 <para>A daemon that provides a cache for the most common name
588 service requests</para>
589 <indexterm zone="ch-system-glibc nscd">
590 <primary sortas="b-nscd">nscd</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594
595 <varlistentry id="pcprofiledump">
596 <term><command>pcprofiledump</command></term>
597 <listitem>
598 <para>Dumps information generated by PC profiling</para>
599 <indexterm zone="ch-system-glibc pcprofiledump">
600 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604
605 <varlistentry id="pldd">
606 <term><command>pldd</command></term>
607 <listitem>
608 <para>Lists dynamic shared objects used by running processes</para>
609 <indexterm zone="ch-system-glibc pldd">
610 <primary sortas="b-pldd">pldd</primary>
611 </indexterm>
612 </listitem>
613 </varlistentry>
614<!--
615 <varlistentry id="pt_chown">
616 <term><command>pt_chown</command></term>
617 <listitem>
618 <para>A helper program for <command>grantpt</command> to set the owner,
619 group and access permissions of a slave pseudo terminal</para>
620 <indexterm zone="ch-system-glibc pt_chown">
621 <primary sortas="b-pt_chown">pt_chown</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625-->
626 <varlistentry id="rpcgen">
627 <term><command>rpcgen</command></term>
628 <listitem>
629 <para>Generates C code to implement the Remote Procedure Call (RPC)
630 protocol</para>
631 <indexterm zone="ch-system-glibc rpcgen">
632 <primary sortas="b-rpcgen">rpcgen</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="sln">
638 <term><command>sln</command></term>
639 <listitem>
640 <para>A statically linked <command>ln</command> program</para>
641 <indexterm zone="ch-system-glibc sln">
642 <primary sortas="b-sln">sln</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="sotruss">
648 <term><command>sotruss</command></term>
649 <listitem>
650 <para>Traces shared library procedure calls of a specified command</para>
651 <indexterm zone="ch-system-glibc sotruss">
652 <primary sortas="b-sotruss">sotruss</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry>
656
657 <varlistentry id="sprof">
658 <term><command>sprof</command></term>
659 <listitem>
660 <para>Reads and displays shared object profiling data</para>
661 <indexterm zone="ch-system-glibc sprof">
662 <primary sortas="b-sprof">sprof</primary>
663 </indexterm>
664 </listitem>
665 </varlistentry>
666
667 <varlistentry id="tzselect">
668 <term><command>tzselect</command></term>
669 <listitem>
670 <para>Asks the user about the location of the system and reports
671 the corresponding time zone description</para>
672 <indexterm zone="ch-system-glibc tzselect">
673 <primary sortas="b-tzselect">tzselect</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="xtrace">
679 <term><command>xtrace</command></term>
680 <listitem>
681 <para>Traces the execution of a program by printing the currently
682 executed function</para>
683 <indexterm zone="ch-system-glibc xtrace">
684 <primary sortas="b-xtrace">xtrace</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="zdump">
690 <term><command>zdump</command></term>
691 <listitem>
692 <para>The time zone dumper</para>
693 <indexterm zone="ch-system-glibc zdump">
694 <primary sortas="b-zdump">zdump</primary>
695 </indexterm>
696 </listitem>
697 </varlistentry>
698
699 <varlistentry id="zic">
700 <term><command>zic</command></term>
701 <listitem>
702 <para>The time zone compiler</para>
703 <indexterm zone="ch-system-glibc zic">
704 <primary sortas="b-zic">zic</primary>
705 </indexterm>
706 </listitem>
707 </varlistentry>
708
709 <varlistentry id="ld.so">
710 <term><filename class="libraryfile">ld.so</filename></term>
711 <listitem>
712 <para>The helper program for shared library executables</para>
713 <indexterm zone="ch-system-glibc ld.so">
714 <primary sortas="c-ld.so">ld.so</primary>
715 </indexterm>
716 </listitem>
717 </varlistentry>
718
719 <varlistentry id="libBrokenLocale">
720 <term><filename class="libraryfile">libBrokenLocale</filename></term>
721 <listitem>
722 <para>Used internally by Glibc as a gross hack to get broken programs
723 (e.g., some Motif applications) running. See comments in
724 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
725 for more information</para>
726 <indexterm zone="ch-system-glibc libBrokenLocale">
727 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
728 </indexterm>
729 </listitem>
730 </varlistentry>
731
732 <varlistentry id="libSegFault">
733 <term><filename class="libraryfile">libSegFault</filename></term>
734 <listitem>
735 <para>The segmentation fault signal handler, used by
736 <command>catchsegv</command></para>
737 <indexterm zone="ch-system-glibc libSegFault">
738 <primary sortas="c-libSegFault">libSegFault</primary>
739 </indexterm>
740 </listitem>
741 </varlistentry>
742
743 <varlistentry id="libanl">
744 <term><filename class="libraryfile">libanl</filename></term>
745 <listitem>
746 <para>An asynchronous name lookup library</para>
747 <indexterm zone="ch-system-glibc libanl">
748 <primary sortas="c-libanl">libanl</primary>
749 </indexterm>
750 </listitem>
751 </varlistentry>
752
753 <varlistentry id="libc">
754 <term><filename class="libraryfile">libc</filename></term>
755 <listitem>
756 <para>The main C library</para>
757 <indexterm zone="ch-system-glibc libc">
758 <primary sortas="c-libc">libc</primary>
759 </indexterm>
760 </listitem>
761 </varlistentry>
762
763 <varlistentry id="libcidn">
764 <term><filename class="libraryfile">libcidn</filename></term>
765 <listitem>
766 <para>Used internally by Glibc for handling internationalized domain
767 names in the <function>getaddrinfo()</function> function</para>
768 <indexterm zone="ch-system-glibc libcidn">
769 <primary sortas="c-libcidn">libcidn</primary>
770 </indexterm>
771 </listitem>
772 </varlistentry>
773
774 <varlistentry id="libcrypt">
775 <term><filename class="libraryfile">libcrypt</filename></term>
776 <listitem>
777 <para>The cryptography library</para>
778 <indexterm zone="ch-system-glibc libcrypt">
779 <primary sortas="c-libcrypt">libcrypt</primary>
780 </indexterm>
781 </listitem>
782 </varlistentry>
783
784 <varlistentry id="libdl">
785 <term><filename class="libraryfile">libdl</filename></term>
786 <listitem>
787 <para>The dynamic linking interface library</para>
788 <indexterm zone="ch-system-glibc libdl">
789 <primary sortas="c-libdl">libdl</primary>
790 </indexterm>
791 </listitem>
792 </varlistentry>
793
794 <varlistentry id="libg">
795 <term><filename class="libraryfile">libg</filename></term>
796 <listitem>
797 <para>Dummy library containing no functions. Previously was a runtime
798 library for <command>g++</command></para>
799 <indexterm zone="ch-system-glibc libg">
800 <primary sortas="c-libg">libg</primary>
801 </indexterm>
802 </listitem>
803 </varlistentry>
804
805 <varlistentry id="libieee">
806 <term><filename class="libraryfile">libieee</filename></term>
807 <listitem>
808 <para>Linking in this module forces error handling rules for math
809 functions as defined by the Institute of Electrical and Electronic
810 Engineers (IEEE). The default is POSIX.1 error handling</para>
811 <indexterm zone="ch-system-glibc libieee">
812 <primary sortas="c-libieee">libieee</primary>
813 </indexterm>
814 </listitem>
815 </varlistentry>
816
817 <varlistentry id="libm">
818 <term><filename class="libraryfile">libm</filename></term>
819 <listitem>
820 <para>The mathematical library</para>
821 <indexterm zone="ch-system-glibc libm">
822 <primary sortas="c-libm">libm</primary>
823 </indexterm>
824 </listitem>
825 </varlistentry>
826
827 <varlistentry id="libmcheck">
828 <term><filename class="libraryfile">libmcheck</filename></term>
829 <listitem>
830 <para>Turns on memory allocation checking when linked to</para>
831 <indexterm zone="ch-system-glibc libmcheck">
832 <primary sortas="c-libmcheck">libmcheck</primary>
833 </indexterm>
834 </listitem>
835 </varlistentry>
836
837 <varlistentry id="libmemusage">
838 <term><filename class="libraryfile">libmemusage</filename></term>
839 <listitem>
840 <para>Used by <command>memusage</command> to help collect
841 information about the memory usage of a program</para>
842 <indexterm zone="ch-system-glibc libmemusage">
843 <primary sortas="c-libmemusage">libmemusage</primary>
844 </indexterm>
845 </listitem>
846 </varlistentry>
847
848 <varlistentry id="libnsl">
849 <term><filename class="libraryfile">libnsl</filename></term>
850 <listitem>
851 <para>The network services library</para>
852 <indexterm zone="ch-system-glibc libnsl">
853 <primary sortas="c-libnsl">libnsl</primary>
854 </indexterm>
855 </listitem>
856 </varlistentry>
857
858 <varlistentry id="libnss">
859 <term><filename class="libraryfile">libnss</filename></term>
860 <listitem>
861 <para>The Name Service Switch libraries, containing functions for
862 resolving host names, user names, group names, aliases, services,
863 protocols, etc.</para>
864 <indexterm zone="ch-system-glibc libnss">
865 <primary sortas="c-libnss">libnss</primary>
866 </indexterm>
867 </listitem>
868 </varlistentry>
869
870 <varlistentry id="libpcprofile">
871 <term><filename class="libraryfile">libpcprofile</filename></term>
872 <listitem>
873 <para>Contains profiling functions used to track the amount of CPU
874 time spent in specific source code lines</para>
875 <indexterm zone="ch-system-glibc libpcprofile">
876 <primary sortas="c-libpcprofile">libpcprofile</primary>
877 </indexterm>
878 </listitem>
879 </varlistentry>
880
881 <varlistentry id="libpthread">
882 <term><filename class="libraryfile">libpthread</filename></term>
883 <listitem>
884 <para>The POSIX threads library</para>
885 <indexterm zone="ch-system-glibc libpthread">
886 <primary sortas="c-libpthread">libpthread</primary>
887 </indexterm>
888 </listitem>
889 </varlistentry>
890
891 <varlistentry id="libresolv">
892 <term><filename class="libraryfile">libresolv</filename></term>
893 <listitem>
894 <para>Contains functions for creating, sending, and interpreting
895 packets to the Internet domain name servers</para>
896 <indexterm zone="ch-system-glibc libresolv">
897 <primary sortas="c-libresolv">libresolv</primary>
898 </indexterm>
899 </listitem>
900 </varlistentry>
901
902 <varlistentry id="librpcsvc">
903 <term><filename class="libraryfile">librpcsvc</filename></term>
904 <listitem>
905 <para>Contains functions providing miscellaneous RPC services</para>
906 <indexterm zone="ch-system-glibc librpcsvc">
907 <primary sortas="c-librpcsvc">librpcsvc</primary>
908 </indexterm>
909 </listitem>
910 </varlistentry>
911
912 <varlistentry id="librt">
913 <term><filename class="libraryfile">librt</filename></term>
914 <listitem>
915 <para>Contains functions providing most of the interfaces specified
916 by the POSIX.1b Realtime Extension</para>
917 <indexterm zone="ch-system-glibc librt">
918 <primary sortas="c-librt">librt</primary>
919 </indexterm>
920 </listitem>
921 </varlistentry>
922
923 <varlistentry id="libthread_db">
924 <term><filename class="libraryfile">libthread_db</filename></term>
925 <listitem>
926 <para>Contains functions useful for building debuggers for
927 multi-threaded programs</para>
928 <indexterm zone="ch-system-glibc libthread_db">
929 <primary sortas="c-libthread_db">libthread_db</primary>
930 </indexterm>
931 </listitem>
932 </varlistentry>
933
934 <varlistentry id="libutil">
935 <term><filename class="libraryfile">libutil</filename></term>
936 <listitem>
937 <para>Contains code for <quote>standard</quote> functions used in
938 many different Unix utilities</para>
939 <indexterm zone="ch-system-glibc libutil">
940 <primary sortas="c-libutil">libutil</primary>
941 </indexterm>
942 </listitem>
943 </varlistentry>
944
945 </variablelist>
946
947 </sect2>
948
949</sect1>
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