source: chapter06/glibc.xml@ 6934b62

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Last change on this file since 6934b62 was 6934b62, checked in by Bruce Dubbs <bdubbs@…>, 8 years ago

Update to linux-4.5.
Update to grep-2.24.
Update to expat-2.1.1.
Update to tzdata-2016c.
Update to iproute2-4.5.0.
Update to man-pages-4.05.
Update to gzip-1.7.

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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>Now fix a build problem that affects i386 systems:</para>
72
73<screen><userinput remap="pre">patch -Np1 -i ../&glibc-upstream-patch;</userinput></screen>
74
75 <para>The most recent stable version of Glibc does not handle large files
76 correctly. Fix the problem with this patch:</para>
77
78<screen><userinput remap="pre">patch -Np1 -i ../&glibc-largefile-patch;</userinput></screen>
79
80 <para>Finally, update some recent changes from the upstream repository:</para>
81
82<screen><userinput remap="pre">patch -Np1 -i ../&glibc-upstream-patch2;</userinput></screen>
83-->
84 <para>The Glibc documentation recommends building Glibc
85 in a dedicated build directory:</para>
86
87<screen><userinput remap="pre">mkdir -v build
88cd build</userinput></screen>
89
90 <para>Prepare Glibc for compilation:</para>
91
92<screen><userinput remap="configure">../configure --prefix=/usr \
93 --enable-kernel=&min-kernel; \
94 --enable-obsolete-rpc</userinput></screen>
95
96 <para>Compile the package:</para>
97
98<screen><userinput remap="make">make</userinput></screen>
99
100 <important>
101 <para>In this section, the test suite for Glibc is considered critical.
102 Do not skip it under any circumstance.</para>
103 </important>
104
105 <para>Generally a few tests do not pass, but you can generally ignore
106 any of the test failures listed below. Now test the build results:</para>
107
108<screen><userinput remap="test">make check</userinput></screen>
109
110 <para>You will probably see some test failures. The Glibc test suite is
111 somewhat dependent on the host system. This is a list of the most common
112 issues seen for this version of LFS:</para>
113
114 <itemizedlist>
115
116 <listitem>
117 <para><emphasis>posix/tst-getaddrinfo4</emphasis> and
118 <emphasis>posix/tst-getaddrinfo5</emphasis> will always fail due
119 to not having the necessary networking applications when the tests are
120 run.</para>
121 </listitem>
122
123 <listitem>
124 <para>The <emphasis>rt/tst-cputimer1</emphasis> and
125 <emphasis>rt/tst-cpuclock2</emphasis> tests have been known to
126 fail. The reason is not completely understood, but indications are
127 that minor timing issues can trigger these failures.</para>
128 </listitem>
129
130 <listitem>
131 <para>The math tests sometimes fail when running on
132 systems where the CPU is not a relatively new Intel or
133 AMD processor.</para>
134 </listitem>
135
136 <listitem>
137 <para>The
138 <emphasis>nptl/tst-thread-affinity-{pthread,pthread2,sched}</emphasis>
139 tests may fail for reasons that have not been determined. </para>
140 </listitem>
141<!--
142 <listitem>
143 <para>The <emphasis>elf/tst-protected1a</emphasis> and
144 <emphasis>elf/tst-protected1b</emphasis> tests are known to
145 fail with the current stable version of binutils.</para>
146 </listitem>
147
148 <listitem>
149 <para>When running on older and slower hardware or on systems under
150 load, some tests can fail because of test timeouts being exceeded.
151 Modifying the make check command to set a TIMEOUTFACTOR is reported to
152 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
153 make -k check</command>).</para>
154 </listitem>
155-->
156<!--
157 <listitem>
158 <para>libio/tst-ftell-partial-wide.out fails because it needs a locale
159 that has not yet been generated.</para>
160 </listitem>
161-->
162 <listitem>
163 <para>Other tests known to fail on some architectures are
164 malloc/tst-malloc-usable and nptl/tst-cleanupx4. </para>
165 </listitem>
166
167 </itemizedlist>
168
169 <para>Though it is a harmless message, the install stage of Glibc will
170 complain about the absence of <filename>/etc/ld.so.conf</filename>.
171 Prevent this warning with:</para>
172
173<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
174
175 <para>Install the package:</para>
176
177<screen><userinput remap="install">make install</userinput></screen>
178
179 <para>Install the configuration file and runtime directory for
180 <command>nscd</command>:</para>
181
182<screen><userinput remap="install">cp -v ../nscd/nscd.conf /etc/nscd.conf
183mkdir -pv /var/cache/nscd</userinput></screen>
184
185 <para>The locales that can make the system respond in a different language
186 were not installed by the above command. None of the locales are required,
187 but if some of them are missing, test suites of the future packages would
188 skip important testcases.</para>
189
190 <para>Individual locales can be installed using the
191 <command>localedef</command> program. E.g., the first
192 <command>localedef</command> command below combines the
193 <filename>/usr/share/i18n/locales/cs_CZ</filename>
194 charset-independent locale definition with the
195 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
196 charmap definition and appends the result to the
197 <filename>/usr/lib/locale/locale-archive</filename> file.
198 The following instructions will install the minimum set of
199 locales necessary for the optimal coverage of tests:</para>
200
201<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
202localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
203localedef -i de_DE -f ISO-8859-1 de_DE
204localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
205localedef -i de_DE -f UTF-8 de_DE.UTF-8
206localedef -i en_GB -f UTF-8 en_GB.UTF-8
207localedef -i en_HK -f ISO-8859-1 en_HK
208localedef -i en_PH -f ISO-8859-1 en_PH
209localedef -i en_US -f ISO-8859-1 en_US
210localedef -i en_US -f UTF-8 en_US.UTF-8
211localedef -i es_MX -f ISO-8859-1 es_MX
212localedef -i fa_IR -f UTF-8 fa_IR
213localedef -i fr_FR -f ISO-8859-1 fr_FR
214localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
215localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
216localedef -i it_IT -f ISO-8859-1 it_IT
217localedef -i it_IT -f UTF-8 it_IT.UTF-8
218localedef -i ja_JP -f EUC-JP ja_JP
219localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
220localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
221localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
222localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
223
224 <para>In addition, install the locale for your own country, language and
225 character set.</para>
226
227 <para>Alternatively, install all locales listed in the
228 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
229 (it includes every locale listed above and many more) at once with the
230 following time-consuming command:</para>
231
232<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
233
234 <para>Then use the <command>localedef</command> command to create and
235 install locales not listed in the
236 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
237 in the unlikely case you need them.</para>
238
239 </sect2>
240
241 <sect2 id="conf-glibc" role="configuration">
242 <title>Configuring Glibc</title>
243
244 <indexterm zone="conf-glibc">
245 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
246 </indexterm>
247
248 <indexterm zone="conf-glibc">
249 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
250 </indexterm>
251
252 <sect3>
253 <title>Adding nsswitch.conf</title>
254
255 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
256 because the Glibc defaults do not work well in a networked environment.
257 </para>
258
259 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
260 following:</para>
261
262<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
263<literal># Begin /etc/nsswitch.conf
264
265passwd: files
266group: files
267shadow: files
268
269hosts: files dns
270networks: files
271
272protocols: files
273services: files
274ethers: files
275rpc: files
276
277# End /etc/nsswitch.conf</literal>
278EOF</userinput></screen>
279
280 </sect3>
281
282 <sect3>
283 <title>Adding time zone data</title>
284
285 <para>Install and set up the time zone data with the following:</para>
286<screen><userinput>tar -xf ../../tzdata&tzdata-version;.tar.gz
287
288ZONEINFO=/usr/share/zoneinfo
289mkdir -pv $ZONEINFO/{posix,right}
290
291for tz in etcetera southamerica northamerica europe africa antarctica \
292 asia australasia backward pacificnew systemv; do
293 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
294 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
295 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
296done
297
298cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
299zic -d $ZONEINFO -p America/New_York
300unset ZONEINFO</userinput></screen>
301
302 <variablelist>
303 <title>The meaning of the zic commands:</title>
304
305 <varlistentry>
306 <term><parameter>zic -L /dev/null ...</parameter></term>
307 <listitem>
308 <para>This creates posix time zones, without any leap seconds. It is
309 conventional to put these in both
310 <filename class="directory">zoneinfo</filename> and
311 <filename class="directory">zoneinfo/posix</filename>. It is
312 necessary to put the POSIX time zones in
313 <filename class="directory">zoneinfo</filename>, otherwise various
314 test-suites will report errors. On an embedded system, where space is
315 tight and you do not intend to ever update the time zones, you could save
316 1.9MB by not using the <filename class="directory">posix</filename>
317 directory, but some applications or test-suites might produce some
318 failures.</para>
319 </listitem>
320 </varlistentry>
321 <varlistentry>
322 <term><parameter>zic -L leapseconds ...</parameter></term>
323 <listitem>
324 <para>This creates right time zones, including leap seconds. On an
325 embedded system, where space is tight and you do not intend to
326 ever update the time zones, or care about the correct time, you could
327 save 1.9MB by omitting the <filename class="directory">right</filename>
328 directory.</para>
329 </listitem>
330 </varlistentry>
331 <varlistentry>
332 <term><parameter>zic ... -p ...</parameter></term>
333 <listitem>
334 <para>This creates the <filename>posixrules</filename> file. We use
335 New York because POSIX requires the daylight savings time rules
336 to be in accordance with US rules.</para>
337 </listitem>
338 </varlistentry>
339 </variablelist>
340
341
342 <para>One way to determine the local time zone is to run the following
343 script:</para>
344
345<screen role="nodump"><userinput>tzselect</userinput></screen>
346
347 <para>After answering a few questions about the location, the script will
348 output the name of the time zone (e.g.,
349 <emphasis>America/Edmonton</emphasis>). There are also some other possible
350 time zones listed in <filename
351 class='directory'>/usr/share/zoneinfo</filename> such as
352 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
353 are not identified by the script but can be used.</para>
354
355 <para>Then create the <filename>/etc/localtime</filename> file by
356 running:</para>
357
358<screen><userinput>cp -v /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
359
360 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
361 time zone selected (e.g., Canada/Eastern).</para>
362
363 </sect3>
364
365 <sect3 id="conf-ld" role="configuration">
366 <title>Configuring the Dynamic Loader</title>
367
368 <indexterm zone="conf-ld">
369 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
370 </indexterm>
371
372 <para>By default, the dynamic loader (<filename
373 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
374 <filename class="directory">/lib</filename> and <filename
375 class="directory">/usr/lib</filename> for dynamic libraries that are
376 needed by programs as they are run. However, if there are libraries in
377 directories other than <filename class="directory">/lib</filename> and
378 <filename class="directory">/usr/lib</filename>, these need to be added
379 to the <filename>/etc/ld.so.conf</filename> file in order for the
380 dynamic loader to find them. Two directories that are commonly known
381 to contain additional libraries are <filename
382 class="directory">/usr/local/lib</filename> and <filename
383 class="directory">/opt/lib</filename>, so add those directories to the
384 dynamic loader's search path.</para>
385
386 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
387 following:</para>
388
389<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
390<literal># Begin /etc/ld.so.conf
391/usr/local/lib
392/opt/lib
393</literal>
394EOF</userinput></screen>
395
396 <para>If desired, the dynamic loader can also search a directory and
397 include the contents of files found there. Generally the files in
398 this include directory are one line specifying the desired library path.
399 To add this capability run the following commands:</para>
400
401<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
402<literal># Add an include directory
403include /etc/ld.so.conf.d/*.conf
404</literal>
405EOF
406mkdir -pv /etc/ld.so.conf.d</userinput></screen>
407
408 </sect3>
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,
422 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
423 zdump, and zic</seg>
424 <seg>ld-&glibc-version;.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, 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/locale,
439 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
440 /var/cache/nscd, 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-&glibc-version;.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-&glibc-version;.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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