source: chapter06/glibc.xml@ 102c4bb6

7.9-systemd 7.9-systemd-rc1 7.9-systemd-rc2 systemd
Last change on this file since 102c4bb6 was 102c4bb6, checked in by Douglas R. Reno <renodr@…>, 6 years ago

Add an upstream patch for MPFR.
Update to libpipeline-1.4.1.
Update to linux-4.1.6.
Update to man-db-2.7.2.
Add a patch to allow glibc to build properly on i386 systems.
Remove obsolete r* programs from inetutils.

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/systemd@10943 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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File size: 34.7 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-system-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Glibc package contains the main C library. This library provides
27 the basic routines for allocating memory, searching directories, opening and
28 closing files, reading and writing files, string handling, pattern matching,
29 arithmetic, and so on.</para>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-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 <para>Some of the Glibc programs use non-FHS compilant
57 <filename class="directory">/var/db</filename> directory to store
58 their runtime data. Apply the following patch to make such programs
59 store their runtime data in the FHS-compliant locations:</para>
60
61<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
62 <para>The Glibc build system is self-contained and will install
63 perfectly, even though the compiler specs file and linker are still
64 pointing at <filename class="directory">/tools</filename>. The specs
65 and linker cannot be adjusted before the Glibc install because the
66 Glibc autoconf tests would give false results and defeat the goal
67 of achieving a clean build.</para>
68
69 <para>Now, fix a build problem that affects i386 systems:</para>
70
71<screen><userinput remap="pre">patch -Np1 -i ../&glibc-upstream-patch;</userinput></screen>
72
73 <para>The Glibc documentation recommends building Glibc outside of the source
74 directory in a dedicated build directory:</para>
75
76<screen><userinput remap="pre">mkdir -v ../glibc-build
77cd ../glibc-build</userinput></screen>
78
79 <para>Prepare Glibc for compilation:</para>
80
81<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
82 --prefix=/usr \
83 --disable-profile \
84 --enable-kernel=&min-kernel; \
85 --enable-obsolete-rpc</userinput></screen>
86
87 <para>Compile the package:</para>
88
89<screen><userinput remap="make">make</userinput></screen>
90
91 <important>
92 <para>In this section, the test suite for Glibc is considered critical.
93 Do not skip it under any circumstance.</para>
94 </important>
95
96 <para>Generally a few tests do not pass, but you can generally ignore
97 any of the test failures listed below. Now test the build results:</para>
98
99<screen><userinput remap="test">make check</userinput></screen>
100
101 <para>You will probably see some test failures. The Glibc test suite is
102 somewhat dependent on the host system. This is a list of the most common
103 issues seen for this version of LFS:</para>
104
105 <itemizedlist>
106
107 <listitem>
108 <para><emphasis>posix/tst-getaddrinfo4</emphasis> will always fail
109 due to not having the necessary network applications when the tests are
110 run.</para>
111 </listitem>
112
113 <listitem>
114 <para>The <emphasis>tst/tst-cputimer1</emphasis> and
115 <emphasis>rt/tst-cpuclock2</emphasis> tests have been known to
116 fail. The reason is not completely understood, but indications are
117 that minor timing issues can trigger these failures.</para>
118 </listitem>
119
120 <listitem>
121 <para>The math tests sometimes fail when running on
122 systems where the CPU is not a relatively new genuine Intel or
123 authentic AMD processor.</para>
124 </listitem>
125<!--
126 <listitem>
127 <para>When running on older and slower hardware or on systems under
128 load, some tests can fail because of test timeouts being exceeded.
129 Modifying the make check command to set a TIMEOUTFACTOR is reported to
130 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
131 make -k check</command>).</para>
132 </listitem>
133-->
134<!--
135 <listitem>
136 <para>libio/tst-ftell-partial-wide.out fails because it needs a locale
137 that has not yet been generated.</para>
138 </listitem>
139-->
140 <listitem>
141 <para>The <emphasis>elf/tst-protected1a</emphasis> and
142 <emphasis>elf/tst-protected1a</emphasis> tests are known to
143 fail with the current stable version of binutils.</para>
144 </listitem>
145
146 <listitem>
147 <para>Other tests known to fail on some architectures are
148 malloc/tst-malloc-usable and nptl/tst-cleanupx4. </para>
149 </listitem>
150
151 </itemizedlist>
152
153 <para>Though it is a harmless message, the install stage of Glibc will
154 complain about the absence of <filename>/etc/ld.so.conf</filename>.
155 Prevent this warning with:</para>
156
157<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
158
159 <para>Install the package:</para>
160
161<screen><userinput remap="install">make install</userinput></screen>
162
163 <para>Install the configuration file and runtime directory for
164 <command>nscd</command>:</para>
165
166<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
167mkdir -pv /var/cache/nscd</userinput></screen>
168
169 <para>Install the systemd support files for <command>nscd</command>:</para>
170
171<screen><userinput remap="install">install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
172install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
173
174 <para>The locales that can make the system respond in a different language
175 were not installed by the above command. None of the locales are required,
176 but if some of them are missing, test suites of the future packages would
177 skip important testcases.</para>
178
179 <para>Individual locales can be installed using the
180 <command>localedef</command> program. E.g., the first
181 <command>localedef</command> command below combines the
182 <filename>/usr/share/i18n/locales/cs_CZ</filename>
183 charset-independent locale definition with the
184 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
185 charmap definition and appends the result to the
186 <filename>/usr/lib/locale/locale-archive</filename> file.
187 The following instructions will install the minimum set of
188 locales necessary for the optimal coverage of tests:</para>
189
190<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
191localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
192localedef -i de_DE -f ISO-8859-1 de_DE
193localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
194localedef -i de_DE -f UTF-8 de_DE.UTF-8
195localedef -i en_GB -f UTF-8 en_GB.UTF-8
196localedef -i en_HK -f ISO-8859-1 en_HK
197localedef -i en_PH -f ISO-8859-1 en_PH
198localedef -i en_US -f ISO-8859-1 en_US
199localedef -i en_US -f UTF-8 en_US.UTF-8
200localedef -i es_MX -f ISO-8859-1 es_MX
201localedef -i fa_IR -f UTF-8 fa_IR
202localedef -i fr_FR -f ISO-8859-1 fr_FR
203localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
204localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
205localedef -i it_IT -f ISO-8859-1 it_IT
206localedef -i it_IT -f UTF-8 it_IT.UTF-8
207localedef -i ja_JP -f EUC-JP ja_JP
208localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
209localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
210localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
211localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
212
213 <para>In addition, install the locale for your own country, language and
214 character set.</para>
215
216 <para>Alternatively, install all locales listed in the
217 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
218 (it includes every locale listed above and many more) at once with the
219 following time-consuming command:</para>
220
221<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
222
223 <para>Then use the <command>localedef</command> command to create and
224 install locales not listed in the
225 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
226 in the unlikely case you need them.</para>
227
228 </sect2>
229
230 <sect2 id="conf-glibc" role="configuration">
231 <title>Configuring Glibc</title>
232
233 <indexterm zone="conf-glibc">
234 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
235 </indexterm>
236
237 <indexterm zone="conf-glibc">
238 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
239 </indexterm>
240
241 <sect3>
242 <title>Adding nsswitch.conf</title>
243
244 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
245 because the Glibc defaults do not work well in a networked environment.
246 </para>
247
248 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
249 following:</para>
250
251<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
252<literal># Begin /etc/nsswitch.conf
253
254passwd: files
255group: files
256shadow: files
257
258hosts: files dns myhostname
259networks: files
260
261protocols: files
262services: files
263ethers: files
264rpc: files
265
266# End /etc/nsswitch.conf</literal>
267EOF</userinput></screen>
268
269 </sect3>
270
271 <sect3>
272 <title>Adding time zone data</title>
273
274 <para>Install and set up the timezone data with the following:</para>
275<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
276
277ZONEINFO=/usr/share/zoneinfo
278mkdir -pv $ZONEINFO/{posix,right}
279
280for tz in etcetera southamerica northamerica europe africa antarctica \
281 asia australasia backward pacificnew systemv; do
282 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
283 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
284 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
285done
286
287cp -v zone.tab zone1970.tab iso3166.tab $ZONEINFO
288zic -d $ZONEINFO -p America/New_York
289unset ZONEINFO</userinput></screen>
290
291 <variablelist>
292 <title>The meaning of the zic commands:</title>
293
294 <varlistentry>
295 <term><parameter>zic -L /dev/null ...</parameter></term>
296 <listitem>
297 <para>This creates posix timezones, without any leap seconds. It is
298 conventional to put these in both
299 <filename class="directory">zoneinfo</filename> and
300 <filename class="directory">zoneinfo/posix</filename>. It is
301 necessary to put the POSIX timezones in
302 <filename class="directory">zoneinfo</filename>, otherwise various
303 test-suites will report errors. On an embedded system, where space is
304 tight and you do not intend to ever update the timezones, you could save
305 1.9MB by not using the <filename class="directory">posix</filename>
306 directory, but some applications or test-suites might produce some
307 failures.</para>
308 </listitem>
309 </varlistentry>
310 <varlistentry>
311 <term><parameter>zic -L leapseconds ...</parameter></term>
312 <listitem>
313 <para>This creates right timezones, including leap seconds. On an
314 embedded system, where space is tight and you do not intend to
315 ever update the timezones, or care about the correct time, you could
316 save 1.9MB by omitting the <filename class="directory">right</filename>
317 directory.</para>
318 </listitem>
319 </varlistentry>
320 <varlistentry>
321 <term><parameter>zic ... -p ...</parameter></term>
322 <listitem>
323 <para>This creates the <filename>posixrules</filename> file. We use
324 New York because POSIX requires the daylight savings time rules
325 to be in accordance with US rules.</para>
326 </listitem>
327 </varlistentry>
328 </variablelist>
329
330
331 <para>One way to determine the local time zone is to run the following
332 script:</para>
333
334<screen role="nodump"><userinput>tzselect</userinput></screen>
335
336 <para>After answering a few questions about the location, the script will
337 output the name of the time zone (e.g.,
338 <emphasis>America/Edmonton</emphasis>). There are also some other possible
339 timezones listed in <filename
340 class='directory'>/usr/share/zoneinfo</filename> such as
341 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
342 are not identified by the script but can be used.</para>
343
344 <para>Then create the <filename>/etc/localtime</filename> file by
345 running:</para>
346
347<screen><userinput>ln -sfv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
348
349 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
350 time zone selected (e.g., Canada/Eastern).</para>
351
352 </sect3>
353
354 <sect3 id="conf-ld" role="configuration">
355 <title>Configuring the Dynamic Loader</title>
356
357 <indexterm zone="conf-ld">
358 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
359 </indexterm>
360
361 <para>By default, the dynamic loader (<filename
362 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
363 <filename class="directory">/lib</filename> and <filename
364 class="directory">/usr/lib</filename> for dynamic libraries that are
365 needed by programs as they are run. However, if there are libraries in
366 directories other than <filename class="directory">/lib</filename> and
367 <filename class="directory">/usr/lib</filename>, these need to be added
368 to the <filename>/etc/ld.so.conf</filename> file in order for the
369 dynamic loader to find them. Two directories that are commonly known
370 to contain additional libraries are <filename
371 class="directory">/usr/local/lib</filename> and <filename
372 class="directory">/opt/lib</filename>, so add those directories to the
373 dynamic loader's search path.</para>
374
375 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
376 following:</para>
377
378<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
379<literal># Begin /etc/ld.so.conf
380/usr/local/lib
381/opt/lib
382</literal>
383EOF</userinput></screen>
384
385 <para>If desired, the dynamic loader can also search a directory and
386 include the contents of files found there. Generally the files in
387 this include directory are one line specifying the desired library path.
388 To add this capability run the following commands:</para>
389
390<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
391<literal># Add an include directory
392include /etc/ld.so.conf.d/*.conf
393</literal>
394EOF
395mkdir -pv /etc/ld.so.conf.d</userinput></screen>
396
397 </sect3>
398 </sect2>
399
400 <sect2 id="contents-glibc" role="content">
401 <title>Contents of Glibc</title>
402
403 <segmentedlist>
404 <segtitle>Installed programs</segtitle>
405 <segtitle>Installed libraries</segtitle>
406 <segtitle>Installed directories</segtitle>
407
408 <seglistitem>
409 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
410 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
411 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
412 zdump, and zic</seg>
413 <seg>ld-&glibc-version;.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
414 libc.{a,so}, libc_nonshared.a, libcidn.so,
415 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
416 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
417 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
418 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
419 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
420 libthread_db.so, and libutil.{a,so}</seg>
421 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
422 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
423 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
424 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
425 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
426 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
427 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/locale,
428 /usr/libexec/getconf, /usr/share/i18n, /usr/share/zoneinfo,
429 /var/cache/nscd, and /var/lib/nss_db</seg>
430 </seglistitem>
431 </segmentedlist>
432
433 <variablelist>
434 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
435 <?dbfo list-presentation="list"?>
436 <?dbhtml list-presentation="table"?>
437
438 <varlistentry id="catchsegv">
439 <term><command>catchsegv</command></term>
440 <listitem>
441 <para>Can be used to create a stack trace when a program
442 terminates with a segmentation fault</para>
443 <indexterm zone="ch-system-glibc catchsegv">
444 <primary sortas="b-catchsegv">catchsegv</primary>
445 </indexterm>
446 </listitem>
447 </varlistentry>
448
449 <varlistentry id="gencat">
450 <term><command>gencat</command></term>
451 <listitem>
452 <para>Generates message catalogues</para>
453 <indexterm zone="ch-system-glibc gencat">
454 <primary sortas="b-gencat">gencat</primary>
455 </indexterm>
456 </listitem>
457 </varlistentry>
458
459 <varlistentry id="getconf">
460 <term><command>getconf</command></term>
461 <listitem>
462 <para>Displays the system configuration values for file system
463 specific variables</para>
464 <indexterm zone="ch-system-glibc getconf">
465 <primary sortas="b-getconf">getconf</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="getent">
471 <term><command>getent</command></term>
472 <listitem>
473 <para>Gets entries from an administrative database</para>
474 <indexterm zone="ch-system-glibc getent">
475 <primary sortas="b-getent">getent</primary>
476 </indexterm>
477 </listitem>
478 </varlistentry>
479
480 <varlistentry id="iconv">
481 <term><command>iconv</command></term>
482 <listitem>
483 <para>Performs character set conversion</para>
484 <indexterm zone="ch-system-glibc iconv">
485 <primary sortas="b-iconv">iconv</primary>
486 </indexterm>
487 </listitem>
488 </varlistentry>
489
490 <varlistentry id="iconvconfig">
491 <term><command>iconvconfig</command></term>
492 <listitem>
493 <para>Creates fastloading <command>iconv</command> module configuration
494 files</para>
495 <indexterm zone="ch-system-glibc iconvconfig">
496 <primary sortas="b-iconvconfig">iconvconfig</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="ldconfig">
502 <term><command>ldconfig</command></term>
503 <listitem>
504 <para>Configures the dynamic linker runtime bindings</para>
505 <indexterm zone="ch-system-glibc ldconfig">
506 <primary sortas="b-ldconfig">ldconfig</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="ldd">
512 <term><command>ldd</command></term>
513 <listitem>
514 <para>Reports which shared libraries are required
515 by each given program or shared library</para>
516 <indexterm zone="ch-system-glibc ldd">
517 <primary sortas="b-ldd">ldd</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="lddlibc4">
523 <term><command>lddlibc4</command></term>
524 <listitem>
525 <para>Assists <command>ldd</command> with object files</para>
526 <indexterm zone="ch-system-glibc lddlibc4">
527 <primary sortas="b-lddlibc4">lddlibc4</primary>
528 </indexterm>
529 </listitem>
530 </varlistentry>
531
532 <varlistentry id="locale">
533 <term><command>locale</command></term>
534 <listitem>
535 <para>Prints various information about the current locale</para>
536 <indexterm zone="ch-system-glibc locale">
537 <primary sortas="b-locale">locale</primary>
538 </indexterm>
539 </listitem>
540 </varlistentry>
541
542 <varlistentry id="localedef">
543 <term><command>localedef</command></term>
544 <listitem>
545 <para>Compiles locale specifications</para>
546 <indexterm zone="ch-system-glibc localedef">
547 <primary sortas="b-localedef">localedef</primary>
548 </indexterm>
549 </listitem>
550 </varlistentry>
551
552 <varlistentry id="makedb">
553 <term><command>makedb</command></term>
554 <listitem>
555 <para>Creates a simple database from textual input</para>
556 <indexterm zone="ch-system-glibc makedb">
557 <primary sortas="b-makedb">makedb</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="mtrace">
563 <term><command>mtrace</command></term>
564 <listitem>
565 <para>Reads and interprets a memory trace file and displays a summary
566 in human-readable format</para>
567 <indexterm zone="ch-system-glibc mtrace">
568 <primary sortas="b-mtrace">mtrace</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="nscd">
574 <term><command>nscd</command></term>
575 <listitem>
576 <para>A daemon that provides a cache for the most common name
577 service requests</para>
578 <indexterm zone="ch-system-glibc nscd">
579 <primary sortas="b-nscd">nscd</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="pcprofiledump">
585 <term><command>pcprofiledump</command></term>
586 <listitem>
587 <para>Dumps information generated by PC profiling</para>
588 <indexterm zone="ch-system-glibc pcprofiledump">
589 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
590 </indexterm>
591 </listitem>
592 </varlistentry>
593
594 <varlistentry id="pldd">
595 <term><command>pldd</command></term>
596 <listitem>
597 <para>Lists dynamic shared objects used by running processes</para>
598 <indexterm zone="ch-system-glibc pldd">
599 <primary sortas="b-pldd">pldd</primary>
600 </indexterm>
601 </listitem>
602 </varlistentry>
603<!--
604 <varlistentry id="pt_chown">
605 <term><command>pt_chown</command></term>
606 <listitem>
607 <para>A helper program for <command>grantpt</command> to set the owner,
608 group and access permissions of a slave pseudo terminal</para>
609 <indexterm zone="ch-system-glibc pt_chown">
610 <primary sortas="b-pt_chown">pt_chown</primary>
611 </indexterm>
612 </listitem>
613 </varlistentry>
614-->
615 <varlistentry id="rpcgen">
616 <term><command>rpcgen</command></term>
617 <listitem>
618 <para>Generates C code to implement the Remote Procedure Call (RPC)
619 protocol</para>
620 <indexterm zone="ch-system-glibc rpcgen">
621 <primary sortas="b-rpcgen">rpcgen</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625
626 <varlistentry id="sln">
627 <term><command>sln</command></term>
628 <listitem>
629 <para>A statically linked <command>ln</command> program</para>
630 <indexterm zone="ch-system-glibc sln">
631 <primary sortas="b-sln">sln</primary>
632 </indexterm>
633 </listitem>
634 </varlistentry>
635
636 <varlistentry id="sotruss">
637 <term><command>sotruss</command></term>
638 <listitem>
639 <para>Traces shared library procedure calls of a specified command</para>
640 <indexterm zone="ch-system-glibc sotruss">
641 <primary sortas="b-sotruss">sotruss</primary>
642 </indexterm>
643 </listitem>
644 </varlistentry>
645
646 <varlistentry id="sprof">
647 <term><command>sprof</command></term>
648 <listitem>
649 <para>Reads and displays shared object profiling data</para>
650 <indexterm zone="ch-system-glibc sprof">
651 <primary sortas="b-sprof">sprof</primary>
652 </indexterm>
653 </listitem>
654 </varlistentry>
655
656 <varlistentry id="tzselect">
657 <term><command>tzselect</command></term>
658 <listitem>
659 <para>Asks the user about the location of the system and reports
660 the corresponding time zone description</para>
661 <indexterm zone="ch-system-glibc tzselect">
662 <primary sortas="b-tzselect">tzselect</primary>
663 </indexterm>
664 </listitem>
665 </varlistentry>
666
667 <varlistentry id="xtrace">
668 <term><command>xtrace</command></term>
669 <listitem>
670 <para>Traces the execution of a program by printing the currently
671 executed function</para>
672 <indexterm zone="ch-system-glibc xtrace">
673 <primary sortas="b-xtrace">xtrace</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="zdump">
679 <term><command>zdump</command></term>
680 <listitem>
681 <para>The time zone dumper</para>
682 <indexterm zone="ch-system-glibc zdump">
683 <primary sortas="b-zdump">zdump</primary>
684 </indexterm>
685 </listitem>
686 </varlistentry>
687
688 <varlistentry id="zic">
689 <term><command>zic</command></term>
690 <listitem>
691 <para>The time zone compiler</para>
692 <indexterm zone="ch-system-glibc zic">
693 <primary sortas="b-zic">zic</primary>
694 </indexterm>
695 </listitem>
696 </varlistentry>
697
698 <varlistentry id="ld.so">
699 <term><filename class="libraryfile">ld-&glibc-version;.so</filename></term>
700 <listitem>
701 <para>The helper program for shared library executables</para>
702 <indexterm zone="ch-system-glibc ld.so">
703 <primary sortas="c-ld.so">ld-&glibc-version;.so</primary>
704 </indexterm>
705 </listitem>
706 </varlistentry>
707
708 <varlistentry id="libBrokenLocale">
709 <term><filename class="libraryfile">libBrokenLocale</filename></term>
710 <listitem>
711 <para>Used internally by Glibc as a gross hack to get broken programs
712 (e.g., some Motif applications) running. See comments in
713 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
714 for more information</para>
715 <indexterm zone="ch-system-glibc libBrokenLocale">
716 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
717 </indexterm>
718 </listitem>
719 </varlistentry>
720
721 <varlistentry id="libSegFault">
722 <term><filename class="libraryfile">libSegFault</filename></term>
723 <listitem>
724 <para>The segmentation fault signal handler, used by
725 <command>catchsegv</command></para>
726 <indexterm zone="ch-system-glibc libSegFault">
727 <primary sortas="c-libSegFault">libSegFault</primary>
728 </indexterm>
729 </listitem>
730 </varlistentry>
731
732 <varlistentry id="libanl">
733 <term><filename class="libraryfile">libanl</filename></term>
734 <listitem>
735 <para>An asynchronous name lookup library</para>
736 <indexterm zone="ch-system-glibc libanl">
737 <primary sortas="c-libanl">libanl</primary>
738 </indexterm>
739 </listitem>
740 </varlistentry>
741
742 <varlistentry id="libc">
743 <term><filename class="libraryfile">libc</filename></term>
744 <listitem>
745 <para>The main C library</para>
746 <indexterm zone="ch-system-glibc libc">
747 <primary sortas="c-libc">libc</primary>
748 </indexterm>
749 </listitem>
750 </varlistentry>
751
752 <varlistentry id="libcidn">
753 <term><filename class="libraryfile">libcidn</filename></term>
754 <listitem>
755 <para>Used internally by Glibc for handling internationalized domain
756 names in the <function>getaddrinfo()</function> function</para>
757 <indexterm zone="ch-system-glibc libcidn">
758 <primary sortas="c-libcidn">libcidn</primary>
759 </indexterm>
760 </listitem>
761 </varlistentry>
762
763 <varlistentry id="libcrypt">
764 <term><filename class="libraryfile">libcrypt</filename></term>
765 <listitem>
766 <para>The cryptography library</para>
767 <indexterm zone="ch-system-glibc libcrypt">
768 <primary sortas="c-libcrypt">libcrypt</primary>
769 </indexterm>
770 </listitem>
771 </varlistentry>
772
773 <varlistentry id="libdl">
774 <term><filename class="libraryfile">libdl</filename></term>
775 <listitem>
776 <para>The dynamic linking interface library</para>
777 <indexterm zone="ch-system-glibc libdl">
778 <primary sortas="c-libdl">libdl</primary>
779 </indexterm>
780 </listitem>
781 </varlistentry>
782
783 <varlistentry id="libg">
784 <term><filename class="libraryfile">libg</filename></term>
785 <listitem>
786 <para>Dummy library containing no functions. Previously was a runtime
787 library for <command>g++</command></para>
788 <indexterm zone="ch-system-glibc libg">
789 <primary sortas="c-libg">libg</primary>
790 </indexterm>
791 </listitem>
792 </varlistentry>
793
794 <varlistentry id="libieee">
795 <term><filename class="libraryfile">libieee</filename></term>
796 <listitem>
797 <para>Linking in this module forces error handling rules for math
798 functions as defined by the Institute of Electrical and Electronic
799 Engineers (IEEE). The default is POSIX.1 error handling</para>
800 <indexterm zone="ch-system-glibc libieee">
801 <primary sortas="c-libieee">libieee</primary>
802 </indexterm>
803 </listitem>
804 </varlistentry>
805
806 <varlistentry id="libm">
807 <term><filename class="libraryfile">libm</filename></term>
808 <listitem>
809 <para>The mathematical library</para>
810 <indexterm zone="ch-system-glibc libm">
811 <primary sortas="c-libm">libm</primary>
812 </indexterm>
813 </listitem>
814 </varlistentry>
815
816 <varlistentry id="libmcheck">
817 <term><filename class="libraryfile">libmcheck</filename></term>
818 <listitem>
819 <para>Turns on memory allocation checking when linked to</para>
820 <indexterm zone="ch-system-glibc libmcheck">
821 <primary sortas="c-libmcheck">libmcheck</primary>
822 </indexterm>
823 </listitem>
824 </varlistentry>
825
826 <varlistentry id="libmemusage">
827 <term><filename class="libraryfile">libmemusage</filename></term>
828 <listitem>
829 <para>Used by <command>memusage</command> to help collect
830 information about the memory usage of a program</para>
831 <indexterm zone="ch-system-glibc libmemusage">
832 <primary sortas="c-libmemusage">libmemusage</primary>
833 </indexterm>
834 </listitem>
835 </varlistentry>
836
837 <varlistentry id="libnsl">
838 <term><filename class="libraryfile">libnsl</filename></term>
839 <listitem>
840 <para>The network services library</para>
841 <indexterm zone="ch-system-glibc libnsl">
842 <primary sortas="c-libnsl">libnsl</primary>
843 </indexterm>
844 </listitem>
845 </varlistentry>
846
847 <varlistentry id="libnss">
848 <term><filename class="libraryfile">libnss</filename></term>
849 <listitem>
850 <para>The Name Service Switch libraries, containing functions for
851 resolving host names, user names, group names, aliases, services,
852 protocols, etc.</para>
853 <indexterm zone="ch-system-glibc libnss">
854 <primary sortas="c-libnss">libnss</primary>
855 </indexterm>
856 </listitem>
857 </varlistentry>
858
859 <varlistentry id="libpcprofile">
860 <term><filename class="libraryfile">libpcprofile</filename></term>
861 <listitem>
862 <para>Contains profiling functions used to track the amount of CPU
863 time spent in specific source code lines</para>
864 <indexterm zone="ch-system-glibc libpcprofile">
865 <primary sortas="c-libpcprofile">libpcprofile</primary>
866 </indexterm>
867 </listitem>
868 </varlistentry>
869
870 <varlistentry id="libpthread">
871 <term><filename class="libraryfile">libpthread</filename></term>
872 <listitem>
873 <para>The POSIX threads library</para>
874 <indexterm zone="ch-system-glibc libpthread">
875 <primary sortas="c-libpthread">libpthread</primary>
876 </indexterm>
877 </listitem>
878 </varlistentry>
879
880 <varlistentry id="libresolv">
881 <term><filename class="libraryfile">libresolv</filename></term>
882 <listitem>
883 <para>Contains functions for creating, sending, and interpreting
884 packets to the Internet domain name servers</para>
885 <indexterm zone="ch-system-glibc libresolv">
886 <primary sortas="c-libresolv">libresolv</primary>
887 </indexterm>
888 </listitem>
889 </varlistentry>
890
891 <varlistentry id="librpcsvc">
892 <term><filename class="libraryfile">librpcsvc</filename></term>
893 <listitem>
894 <para>Contains functions providing miscellaneous RPC services</para>
895 <indexterm zone="ch-system-glibc librpcsvc">
896 <primary sortas="c-librpcsvc">librpcsvc</primary>
897 </indexterm>
898 </listitem>
899 </varlistentry>
900
901 <varlistentry id="librt">
902 <term><filename class="libraryfile">librt</filename></term>
903 <listitem>
904 <para>Contains functions providing most of the interfaces specified
905 by the POSIX.1b Realtime Extension</para>
906 <indexterm zone="ch-system-glibc librt">
907 <primary sortas="c-librt">librt</primary>
908 </indexterm>
909 </listitem>
910 </varlistentry>
911
912 <varlistentry id="libthread_db">
913 <term><filename class="libraryfile">libthread_db</filename></term>
914 <listitem>
915 <para>Contains functions useful for building debuggers for
916 multi-threaded programs</para>
917 <indexterm zone="ch-system-glibc libthread_db">
918 <primary sortas="c-libthread_db">libthread_db</primary>
919 </indexterm>
920 </listitem>
921 </varlistentry>
922
923 <varlistentry id="libutil">
924 <term><filename class="libraryfile">libutil</filename></term>
925 <listitem>
926 <para>Contains code for <quote>standard</quote> functions used in
927 many different Unix utilities</para>
928 <indexterm zone="ch-system-glibc libutil">
929 <primary sortas="c-libutil">libutil</primary>
930 </indexterm>
931 </listitem>
932 </varlistentry>
933
934 </variablelist>
935
936 </sect2>
937
938</sect1>
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