source: chapter06/glibc.xml@ 58c8823

7.5-systemd 7.6-systemd 7.7-systemd 7.8-systemd 7.9-systemd
Last change on this file since 58c8823 was 58c8823, checked in by Krejzi <krejzi@…>, 10 years ago

Random fixes.

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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 --enable-obsolete-rpc</userinput></screen>
88
89 <variablelist>
90 <title>The meaning of the new configure options:</title>
91
92 <varlistentry>
93 <term><parameter>--enable-obsolete-rpc</parameter></term>
94 <listitem>
95 <para>Installs NIS and RPC related headers that are not installed by
96 default; these are required to rebuild Glibc and by several BLFS
97 packages.</para>
98 </listitem>
99 </varlistentry>
100
101 </variablelist>
102
103 <para>Compile the package:</para>
104
105<screen><userinput remap="make">make</userinput></screen>
106
107 <important>
108 <para>In this section, the test suite for Glibc is considered critical.
109 Do not skip it under any circumstance.</para>
110 </important>
111
112 <para>Generally a few tests do not pass, but you can generally ignore
113 any of the test failures listed below. Now test the build results:</para>
114
115<screen><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log
116grep Error glibc-check-log</userinput></screen>
117
118 <para>You will probably see an expected (ignored) failure in the
119 <emphasis>posix/annexc</emphasis> and
120 <emphasis>conform/run-conformtest</emphasis> tests. In addition the Glibc
121 test suite is somewhat dependent on the host system. This is a list of the
122 most common issues:</para>
123
124 <itemizedlist>
125
126 <listitem>
127 <para>The <emphasis>nptl/tst-clock2</emphasis>,
128 <emphasis>nptl/tst-attr3</emphasis>,
129 <emphasis>tst/tst-cputimer1</emphasis>, and
130 <emphasis>rt/tst-cpuclock2</emphasis>
131 tests have been known to fail. The
132 reason is not completely understood, but indications are that minor
133 timing issues can trigger these failures.</para>
134 </listitem>
135
136 <listitem>
137 <para>The math tests sometimes fail when running on
138 systems where the CPU is not a relatively new genuine Intel or
139 authentic AMD processor.</para>
140 </listitem>
141
142 <listitem>
143 <para>When running on older and slower hardware or on systems under
144 load, some tests can fail because of test timeouts being exceeded.
145 Modifying the make check command to set a TIMEOUTFACTOR is reported to
146 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
147 make -k check</command>).</para>
148 </listitem>
149
150 <listitem>
151 <para>posix/tst-getaddrinfo4 will always fail due to not having a network
152 connection when the test is run.</para>
153 </listitem>
154
155 <listitem>
156 <para>libio/tst-ftell-partial-wide.out fails because it needs a locale
157 that has not yet been generated.</para>
158 </listitem>
159
160 <listitem>
161 <para>Other tests known to fail on some architectures are posix/bug-regex32,
162 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, nptl/tst-robust8,
163 and stdio-common/bug22.</para>
164 </listitem>
165
166 </itemizedlist>
167
168 <para>Though it is a harmless message, the install stage of Glibc will
169 complain about the absence of <filename>/etc/ld.so.conf</filename>.
170 Prevent this warning with:</para>
171
172<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
173
174 <para>Install the package:</para>
175
176<screen><userinput remap="install">make install</userinput></screen>
177
178 <para>Install the configuration file and runtime directory for
179 <command>nscd</command>:</para>
180
181<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
182mkdir -pv /var/cache/nscd</userinput></screen>
183
184 <para>Install the Systemd support files for <command>nscd</command>:</para>
185
186<screen><userinput remap="install">install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.tmpfiles /usr/lib/tmpfiles.d/nscd.conf
187install -v -Dm644 ../glibc-&glibc-version;/nscd/nscd.service /lib/systemd/system/nscd.service</userinput></screen>
188
189 <para>The locales that can make the system respond in a different language
190 were not installed by the above command. None of the locales are required,
191 but if some of them are missing, test suites of the future packages would
192 skip important testcases.</para>
193
194 <para>Individual locales can be installed using the
195 <command>localedef</command> program. E.g., the first
196 <command>localedef</command> command below combines the
197 <filename>/usr/share/i18n/locales/cs_CZ</filename>
198 charset-independent locale definition with the
199 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
200 charmap definition and appends the result to the
201 <filename>/usr/lib/locale/locale-archive</filename> file.
202 The following instructions will install the minimum set of
203 locales necessary for the optimal coverage of tests:</para>
204
205<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
206localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
207localedef -i de_DE -f ISO-8859-1 de_DE
208localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
209localedef -i de_DE -f UTF-8 de_DE.UTF-8
210localedef -i en_GB -f UTF-8 en_GB.UTF-8
211localedef -i en_HK -f ISO-8859-1 en_HK
212localedef -i en_PH -f ISO-8859-1 en_PH
213localedef -i en_US -f ISO-8859-1 en_US
214localedef -i en_US -f UTF-8 en_US.UTF-8
215localedef -i es_MX -f ISO-8859-1 es_MX
216localedef -i fa_IR -f UTF-8 fa_IR
217localedef -i fr_FR -f ISO-8859-1 fr_FR
218localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
219localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
220localedef -i it_IT -f ISO-8859-1 it_IT
221localedef -i it_IT -f UTF-8 it_IT.UTF-8
222localedef -i ja_JP -f EUC-JP ja_JP
223localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
224localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
225localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
226localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
227
228 <para>In addition, install the locale for your own country, language and
229 character set.</para>
230
231 <para>Alternatively, install all locales listed in the
232 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
233 (it includes every locale listed above and many more) at once with the
234 following time-consuming command:</para>
235
236<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
237
238 <para>Then use the <command>localedef</command> command to create and
239 install locales not listed in the
240 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
241 in the unlikely case you need them.</para>
242
243 </sect2>
244
245 <sect2 id="conf-glibc" role="configuration">
246 <title>Configuring Glibc</title>
247
248 <indexterm zone="conf-glibc">
249 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
250 </indexterm>
251
252 <indexterm zone="conf-glibc">
253 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
254 </indexterm>
255
256 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
257 because, although Glibc provides defaults when this file is missing or corrupt,
258 the Glibc defaults do not work well in a networked environment. The time zone
259 also needs to be configured.</para>
260
261 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
262 following:</para>
263
264<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
265<literal># Begin /etc/nsswitch.conf
266
267passwd: files
268group: files
269shadow: files
270
271hosts: files dns myhostname
272networks: files
273
274protocols: files
275services: files
276ethers: files
277rpc: files
278
279# End /etc/nsswitch.conf</literal>
280EOF</userinput></screen>
281
282 <para>Install timezone data:</para>
283<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
284
285ZONEINFO=/usr/share/zoneinfo
286mkdir -pv $ZONEINFO/{posix,right}
287
288for tz in etcetera southamerica northamerica europe africa antarctica \
289 asia australasia backward pacificnew systemv; do
290 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
291 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
292 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
293done
294
295cp -v zone.tab iso3166.tab $ZONEINFO
296zic -d $ZONEINFO -p America/New_York
297unset ZONEINFO</userinput></screen>
298
299 <variablelist>
300 <title>The meaning of the zic commands:</title>
301
302 <varlistentry>
303 <term><parameter>zic -L /dev/null ...</parameter></term>
304 <listitem>
305 <para>This creates posix timezones, without any leap seconds. It is
306 conventional to put these in both
307 <filename class="directory">zoneinfo</filename> and
308 <filename class="directory">zoneinfo/posix</filename>. It is
309 necessary to put the POSIX timezones in
310 <filename class="directory">zoneinfo</filename>, otherwise various
311 test-suites will report errors. On an embedded system, where space is
312 tight and you do not intend to ever update the timezones, you could save
313 1.9MB by not using the <filename class="directory">posix</filename>
314 directory, but some applications or test-suites might give less good
315 results</para>
316 </listitem>
317 </varlistentry>
318 <varlistentry>
319 <term><parameter>zic -L leapseconds ...</parameter></term>
320 <listitem>
321 <para>This creates right timezones, including leap seconds. On an
322 embedded system, where space is tight and you do not intend to
323 ever update the timezones, or care about the correct time, you could
324 save 1.9MB by omitting the <filename class="directory">right</filename>
325 directory.</para>
326 </listitem>
327 </varlistentry>
328 <varlistentry>
329 <term><parameter>zic ... -p ...</parameter></term>
330 <listitem>
331 <para>This creates the <filename>posixrules</filename> file. We use
332 New York because POSIX requires the daylight savings time rules
333 to be in accordance with US rules.</para>
334 </listitem>
335 </varlistentry>
336 </variablelist>
337
338
339 <para>One way to determine the local time zone is to run the following
340 script:</para>
341
342<screen role="nodump"><userinput>tzselect</userinput></screen>
343
344 <para>After answering a few questions about the location, the script will
345 output the name of the time zone (e.g.,
346 <emphasis>America/Edmonton</emphasis>). There are also some other possible
347 timezones listed in <filename
348 class='directory'>/usr/share/zoneinfo</filename> such as
349 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
350 are not identified by the script but can be used.</para>
351
352 <para>Then create the <filename>/etc/localtime</filename> file by
353 running:</para>
354
355<screen><userinput>ln -sv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
356
357 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
358 time zone selected (e.g., Canada/Eastern).</para>
359
360 </sect2>
361
362 <sect2 id="conf-ld" role="configuration">
363 <title>Configuring the Dynamic Loader</title>
364
365 <indexterm zone="conf-ld">
366 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
367 </indexterm>
368
369 <para>By default, the dynamic loader (<filename
370 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
371 <filename class="directory">/lib</filename> and <filename
372 class="directory">/usr/lib</filename> for dynamic libraries that are
373 needed by programs as they are run. However, if there are libraries in
374 directories other than <filename class="directory">/lib</filename> and
375 <filename class="directory">/usr/lib</filename>, these need to be added
376 to the <filename>/etc/ld.so.conf</filename> file in order for the
377 dynamic loader to find them. Two directories that are commonly known
378 to contain additional libraries are <filename
379 class="directory">/usr/local/lib</filename> and <filename
380 class="directory">/opt/lib</filename>, so add those directories to the
381 dynamic loader's search path.</para>
382
383 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
384 following:</para>
385
386<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
387<literal># Begin /etc/ld.so.conf
388/usr/local/lib
389/opt/lib
390</literal>
391EOF</userinput></screen>
392
393 <para>If desired, the dynamic loader can also search a directory and
394 include the contents of files found there. Generally the files in
395 this include directory are one line specifying the desired library path.
396 To add this capability run the following commands:</para>
397
398<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
399<literal># Add an include directory
400include /etc/ld.so.conf.d/*.conf
401</literal>
402EOF
403mkdir -pv /etc/ld.so.conf.d</userinput></screen>
404
405 </sect2>
406
407 <sect2 id="contents-glibc" role="content">
408 <title>Contents of Glibc</title>
409
410 <segmentedlist>
411 <segtitle>Installed programs</segtitle>
412 <segtitle>Installed libraries</segtitle>
413 <segtitle>Installed directories</segtitle>
414
415 <seglistitem>
416 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
417 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
418 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
419 zdump, and zic</seg>
420 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
421 libc.{a,so}, libc_nonshared.a, libcidn.so,
422 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
423 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
424 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
425 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
426 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
427 libthread_db.so, and libutil.{a,so}</seg>
428 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
429 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
430 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
431 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
432 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
433 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
434 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/getconf,
435 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo, /var/cache/nscd,
436 and /var/lib/nss_db</seg>
437 </seglistitem>
438 </segmentedlist>
439
440 <variablelist>
441 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
442 <?dbfo list-presentation="list"?>
443 <?dbhtml list-presentation="table"?>
444
445 <varlistentry id="catchsegv">
446 <term><command>catchsegv</command></term>
447 <listitem>
448 <para>Can be used to create a stack trace when a program
449 terminates with a segmentation fault</para>
450 <indexterm zone="ch-system-glibc catchsegv">
451 <primary sortas="b-catchsegv">catchsegv</primary>
452 </indexterm>
453 </listitem>
454 </varlistentry>
455
456 <varlistentry id="gencat">
457 <term><command>gencat</command></term>
458 <listitem>
459 <para>Generates message catalogues</para>
460 <indexterm zone="ch-system-glibc gencat">
461 <primary sortas="b-gencat">gencat</primary>
462 </indexterm>
463 </listitem>
464 </varlistentry>
465
466 <varlistentry id="getconf">
467 <term><command>getconf</command></term>
468 <listitem>
469 <para>Displays the system configuration values for file system
470 specific variables</para>
471 <indexterm zone="ch-system-glibc getconf">
472 <primary sortas="b-getconf">getconf</primary>
473 </indexterm>
474 </listitem>
475 </varlistentry>
476
477 <varlistentry id="getent">
478 <term><command>getent</command></term>
479 <listitem>
480 <para>Gets entries from an administrative database</para>
481 <indexterm zone="ch-system-glibc getent">
482 <primary sortas="b-getent">getent</primary>
483 </indexterm>
484 </listitem>
485 </varlistentry>
486
487 <varlistentry id="iconv">
488 <term><command>iconv</command></term>
489 <listitem>
490 <para>Performs character set conversion</para>
491 <indexterm zone="ch-system-glibc iconv">
492 <primary sortas="b-iconv">iconv</primary>
493 </indexterm>
494 </listitem>
495 </varlistentry>
496
497 <varlistentry id="iconvconfig">
498 <term><command>iconvconfig</command></term>
499 <listitem>
500 <para>Creates fastloading <command>iconv</command> module configuration
501 files</para>
502 <indexterm zone="ch-system-glibc iconvconfig">
503 <primary sortas="b-iconvconfig">iconvconfig</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="ldconfig">
509 <term><command>ldconfig</command></term>
510 <listitem>
511 <para>Configures the dynamic linker runtime bindings</para>
512 <indexterm zone="ch-system-glibc ldconfig">
513 <primary sortas="b-ldconfig">ldconfig</primary>
514 </indexterm>
515 </listitem>
516 </varlistentry>
517
518 <varlistentry id="ldd">
519 <term><command>ldd</command></term>
520 <listitem>
521 <para>Reports which shared libraries are required
522 by each given program or shared library</para>
523 <indexterm zone="ch-system-glibc ldd">
524 <primary sortas="b-ldd">ldd</primary>
525 </indexterm>
526 </listitem>
527 </varlistentry>
528
529 <varlistentry id="lddlibc4">
530 <term><command>lddlibc4</command></term>
531 <listitem>
532 <para>Assists <command>ldd</command> with object files</para>
533 <indexterm zone="ch-system-glibc lddlibc4">
534 <primary sortas="b-lddlibc4">lddlibc4</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="locale">
540 <term><command>locale</command></term>
541 <listitem>
542 <para>Prints various information about the current locale</para>
543 <indexterm zone="ch-system-glibc locale">
544 <primary sortas="b-locale">locale</primary>
545 </indexterm>
546 </listitem>
547 </varlistentry>
548
549 <varlistentry id="localedef">
550 <term><command>localedef</command></term>
551 <listitem>
552 <para>Compiles locale specifications</para>
553 <indexterm zone="ch-system-glibc localedef">
554 <primary sortas="b-localedef">localedef</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="makedb">
560 <term><command>makedb</command></term>
561 <listitem>
562 <para>Creates a simple database from textual input</para>
563 <indexterm zone="ch-system-glibc makedb">
564 <primary sortas="b-makedb">makedb</primary>
565 </indexterm>
566 </listitem>
567 </varlistentry>
568
569 <varlistentry id="mtrace">
570 <term><command>mtrace</command></term>
571 <listitem>
572 <para>Reads and interprets a memory trace file and displays a summary
573 in human-readable format</para>
574 <indexterm zone="ch-system-glibc mtrace">
575 <primary sortas="b-mtrace">mtrace</primary>
576 </indexterm>
577 </listitem>
578 </varlistentry>
579
580 <varlistentry id="nscd">
581 <term><command>nscd</command></term>
582 <listitem>
583 <para>A daemon that provides a cache for the most common name
584 service requests</para>
585 <indexterm zone="ch-system-glibc nscd">
586 <primary sortas="b-nscd">nscd</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="pcprofiledump">
592 <term><command>pcprofiledump</command></term>
593 <listitem>
594 <para>Dumps information generated by PC profiling</para>
595 <indexterm zone="ch-system-glibc pcprofiledump">
596 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
597 </indexterm>
598 </listitem>
599 </varlistentry>
600
601 <varlistentry id="pldd">
602 <term><command>pldd</command></term>
603 <listitem>
604 <para>Lists dynamic shared objects used by running processes</para>
605 <indexterm zone="ch-system-glibc pldd">
606 <primary sortas="b-pldd">pldd</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610<!--
611 <varlistentry id="pt_chown">
612 <term><command>pt_chown</command></term>
613 <listitem>
614 <para>A helper program for <command>grantpt</command> to set the owner,
615 group and access permissions of a slave pseudo terminal</para>
616 <indexterm zone="ch-system-glibc pt_chown">
617 <primary sortas="b-pt_chown">pt_chown</primary>
618 </indexterm>
619 </listitem>
620 </varlistentry>
621-->
622 <varlistentry id="rpcgen">
623 <term><command>rpcgen</command></term>
624 <listitem>
625 <para>Generates C code to implement the Remote Procedure Call (RPC)
626 protocol</para>
627 <indexterm zone="ch-system-glibc rpcgen">
628 <primary sortas="b-rpcgen">rpcgen</primary>
629 </indexterm>
630 </listitem>
631 </varlistentry>
632
633 <varlistentry id="sln">
634 <term><command>sln</command></term>
635 <listitem>
636 <para>A statically linked <command>ln</command> program</para>
637 <indexterm zone="ch-system-glibc sln">
638 <primary sortas="b-sln">sln</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 <varlistentry id="sotruss">
644 <term><command>sotruss</command></term>
645 <listitem>
646 <para>Traces shared library procedure calls of a specified command</para>
647 <indexterm zone="ch-system-glibc sotruss">
648 <primary sortas="b-sotruss">sotruss</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="sprof">
654 <term><command>sprof</command></term>
655 <listitem>
656 <para>Reads and displays shared object profiling data</para>
657 <indexterm zone="ch-system-glibc sprof">
658 <primary sortas="b-sprof">sprof</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="tzselect">
664 <term><command>tzselect</command></term>
665 <listitem>
666 <para>Asks the user about the location of the system and reports
667 the corresponding time zone description</para>
668 <indexterm zone="ch-system-glibc tzselect">
669 <primary sortas="b-tzselect">tzselect</primary>
670 </indexterm>
671 </listitem>
672 </varlistentry>
673
674 <varlistentry id="xtrace">
675 <term><command>xtrace</command></term>
676 <listitem>
677 <para>Traces the execution of a program by printing the currently
678 executed function</para>
679 <indexterm zone="ch-system-glibc xtrace">
680 <primary sortas="b-xtrace">xtrace</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="zdump">
686 <term><command>zdump</command></term>
687 <listitem>
688 <para>The time zone dumper</para>
689 <indexterm zone="ch-system-glibc zdump">
690 <primary sortas="b-zdump">zdump</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="zic">
696 <term><command>zic</command></term>
697 <listitem>
698 <para>The time zone compiler</para>
699 <indexterm zone="ch-system-glibc zic">
700 <primary sortas="b-zic">zic</primary>
701 </indexterm>
702 </listitem>
703 </varlistentry>
704
705 <varlistentry id="ld.so">
706 <term><filename class="libraryfile">ld.so</filename></term>
707 <listitem>
708 <para>The helper program for shared library executables</para>
709 <indexterm zone="ch-system-glibc ld.so">
710 <primary sortas="c-ld.so">ld.so</primary>
711 </indexterm>
712 </listitem>
713 </varlistentry>
714
715 <varlistentry id="libBrokenLocale">
716 <term><filename class="libraryfile">libBrokenLocale</filename></term>
717 <listitem>
718 <para>Used internally by Glibc as a gross hack to get broken programs
719 (e.g., some Motif applications) running. See comments in
720 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
721 for more information</para>
722 <indexterm zone="ch-system-glibc libBrokenLocale">
723 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
724 </indexterm>
725 </listitem>
726 </varlistentry>
727
728 <varlistentry id="libSegFault">
729 <term><filename class="libraryfile">libSegFault</filename></term>
730 <listitem>
731 <para>The segmentation fault signal handler, used by
732 <command>catchsegv</command></para>
733 <indexterm zone="ch-system-glibc libSegFault">
734 <primary sortas="c-libSegFault">libSegFault</primary>
735 </indexterm>
736 </listitem>
737 </varlistentry>
738
739 <varlistentry id="libanl">
740 <term><filename class="libraryfile">libanl</filename></term>
741 <listitem>
742 <para>An asynchronous name lookup library</para>
743 <indexterm zone="ch-system-glibc libanl">
744 <primary sortas="c-libanl">libanl</primary>
745 </indexterm>
746 </listitem>
747 </varlistentry>
748
749 <varlistentry id="libc">
750 <term><filename class="libraryfile">libc</filename></term>
751 <listitem>
752 <para>The main C library</para>
753 <indexterm zone="ch-system-glibc libc">
754 <primary sortas="c-libc">libc</primary>
755 </indexterm>
756 </listitem>
757 </varlistentry>
758
759 <varlistentry id="libcidn">
760 <term><filename class="libraryfile">libcidn</filename></term>
761 <listitem>
762 <para>Used internally by Glibc for handling internationalized domain
763 names in the <function>getaddrinfo()</function> function</para>
764 <indexterm zone="ch-system-glibc libcidn">
765 <primary sortas="c-libcidn">libcidn</primary>
766 </indexterm>
767 </listitem>
768 </varlistentry>
769
770 <varlistentry id="libcrypt">
771 <term><filename class="libraryfile">libcrypt</filename></term>
772 <listitem>
773 <para>The cryptography library</para>
774 <indexterm zone="ch-system-glibc libcrypt">
775 <primary sortas="c-libcrypt">libcrypt</primary>
776 </indexterm>
777 </listitem>
778 </varlistentry>
779
780 <varlistentry id="libdl">
781 <term><filename class="libraryfile">libdl</filename></term>
782 <listitem>
783 <para>The dynamic linking interface library</para>
784 <indexterm zone="ch-system-glibc libdl">
785 <primary sortas="c-libdl">libdl</primary>
786 </indexterm>
787 </listitem>
788 </varlistentry>
789
790 <varlistentry id="libg">
791 <term><filename class="libraryfile">libg</filename></term>
792 <listitem>
793 <para>Dummy library containing no functions. Previously was a runtime
794 library for <command>g++</command></para>
795 <indexterm zone="ch-system-glibc libg">
796 <primary sortas="c-libg">libg</primary>
797 </indexterm>
798 </listitem>
799 </varlistentry>
800
801 <varlistentry id="libieee">
802 <term><filename class="libraryfile">libieee</filename></term>
803 <listitem>
804 <para>Linking in this module forces error handling rules for math
805 functions as defined by the Institute of Electrical and Electronic
806 Engineers (IEEE). The default is POSIX.1 error handling</para>
807 <indexterm zone="ch-system-glibc libieee">
808 <primary sortas="c-libieee">libieee</primary>
809 </indexterm>
810 </listitem>
811 </varlistentry>
812
813 <varlistentry id="libm">
814 <term><filename class="libraryfile">libm</filename></term>
815 <listitem>
816 <para>The mathematical library</para>
817 <indexterm zone="ch-system-glibc libm">
818 <primary sortas="c-libm">libm</primary>
819 </indexterm>
820 </listitem>
821 </varlistentry>
822
823 <varlistentry id="libmcheck">
824 <term><filename class="libraryfile">libmcheck</filename></term>
825 <listitem>
826 <para>Turns on memory allocation checking when linked to</para>
827 <indexterm zone="ch-system-glibc libmcheck">
828 <primary sortas="c-libmcheck">libmcheck</primary>
829 </indexterm>
830 </listitem>
831 </varlistentry>
832
833 <varlistentry id="libmemusage">
834 <term><filename class="libraryfile">libmemusage</filename></term>
835 <listitem>
836 <para>Used by <command>memusage</command> to help collect
837 information about the memory usage of a program</para>
838 <indexterm zone="ch-system-glibc libmemusage">
839 <primary sortas="c-libmemusage">libmemusage</primary>
840 </indexterm>
841 </listitem>
842 </varlistentry>
843
844 <varlistentry id="libnsl">
845 <term><filename class="libraryfile">libnsl</filename></term>
846 <listitem>
847 <para>The network services library</para>
848 <indexterm zone="ch-system-glibc libnsl">
849 <primary sortas="c-libnsl">libnsl</primary>
850 </indexterm>
851 </listitem>
852 </varlistentry>
853
854 <varlistentry id="libnss">
855 <term><filename class="libraryfile">libnss</filename></term>
856 <listitem>
857 <para>The Name Service Switch libraries, containing functions for
858 resolving host names, user names, group names, aliases, services,
859 protocols, etc.</para>
860 <indexterm zone="ch-system-glibc libnss">
861 <primary sortas="c-libnss">libnss</primary>
862 </indexterm>
863 </listitem>
864 </varlistentry>
865
866 <varlistentry id="libpcprofile">
867 <term><filename class="libraryfile">libpcprofile</filename></term>
868 <listitem>
869 <para>Contains profiling functions used to track the amount of CPU
870 time spent in specific source code lines</para>
871 <indexterm zone="ch-system-glibc libpcprofile">
872 <primary sortas="c-libpcprofile">libpcprofile</primary>
873 </indexterm>
874 </listitem>
875 </varlistentry>
876
877 <varlistentry id="libpthread">
878 <term><filename class="libraryfile">libpthread</filename></term>
879 <listitem>
880 <para>The POSIX threads library</para>
881 <indexterm zone="ch-system-glibc libpthread">
882 <primary sortas="c-libpthread">libpthread</primary>
883 </indexterm>
884 </listitem>
885 </varlistentry>
886
887 <varlistentry id="libresolv">
888 <term><filename class="libraryfile">libresolv</filename></term>
889 <listitem>
890 <para>Contains functions for creating, sending, and interpreting
891 packets to the Internet domain name servers</para>
892 <indexterm zone="ch-system-glibc libresolv">
893 <primary sortas="c-libresolv">libresolv</primary>
894 </indexterm>
895 </listitem>
896 </varlistentry>
897
898 <varlistentry id="librpcsvc">
899 <term><filename class="libraryfile">librpcsvc</filename></term>
900 <listitem>
901 <para>Contains functions providing miscellaneous RPC services</para>
902 <indexterm zone="ch-system-glibc librpcsvc">
903 <primary sortas="c-librpcsvc">librpcsvc</primary>
904 </indexterm>
905 </listitem>
906 </varlistentry>
907
908 <varlistentry id="librt">
909 <term><filename class="libraryfile">librt</filename></term>
910 <listitem>
911 <para>Contains functions providing most of the interfaces specified
912 by the POSIX.1b Realtime Extension</para>
913 <indexterm zone="ch-system-glibc librt">
914 <primary sortas="c-librt">librt</primary>
915 </indexterm>
916 </listitem>
917 </varlistentry>
918
919 <varlistentry id="libthread_db">
920 <term><filename class="libraryfile">libthread_db</filename></term>
921 <listitem>
922 <para>Contains functions useful for building debuggers for
923 multi-threaded programs</para>
924 <indexterm zone="ch-system-glibc libthread_db">
925 <primary sortas="c-libthread_db">libthread_db</primary>
926 </indexterm>
927 </listitem>
928 </varlistentry>
929
930 <varlistentry id="libutil">
931 <term><filename class="libraryfile">libutil</filename></term>
932 <listitem>
933 <para>Contains code for <quote>standard</quote> functions used in
934 many different Unix utilities</para>
935 <indexterm zone="ch-system-glibc libutil">
936 <primary sortas="c-libutil">libutil</primary>
937 </indexterm>
938 </listitem>
939 </varlistentry>
940
941 </variablelist>
942
943 </sect2>
944
945</sect1>
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