source: chapter06/glibc.xml@ 20dd334

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Last change on this file since 20dd334 was 20dd334, checked in by Bruce Dubbs <bdubbs@…>, 11 years ago

Fix an upstream problem in glibc
Update to linix-3.10.10

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10330 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
  • Property mode set to 100644
File size: 35.6 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
57 <para>The Glibc build system is self-contained and will install
58 perfectly, even though the compiler specs file and linker are still
59 pointing at <filename class="directory">/tools</filename>. The specs
60 and linker cannot be adjusted before the Glibc install because the
61 Glibc autoconf tests would give false results and defeat the goal
62 of achieving a clean build.</para>
63
64 <para>An upstream change needs to be reverted:</para>
65
66<screen><userinput remap="pre">sed -i -e 's/static __m128i/inline &amp;/' sysdeps/x86_64/multiarch/strstr.c</userinput></screen>
67
68
69 <para>The Glibc documentation recommends building Glibc outside of the source
70 directory in a dedicated build directory:</para>
71
72<screen><userinput remap="pre">mkdir -v ../glibc-build
73cd ../glibc-build</userinput></screen>
74
75 <para>Prepare Glibc for compilation:</para>
76
77<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
78 --prefix=/usr \
79 --disable-profile \
80 --enable-kernel=&min-kernel; \
81 --libexecdir=/usr/lib/glibc</userinput></screen>
82
83 <variablelist>
84 <title>The meaning of the new configure options:</title>
85
86 <varlistentry>
87 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
88 <listitem>
89 <para>This changes the location of some auxillary files from the
90 default of <filename class="directory">/usr/libexec</filename> to
91 <filename class="directory">/usr/lib/glibc</filename>.</para>
92 </listitem>
93 </varlistentry>
94
95 </variablelist>
96
97 <para>Compile the package:</para>
98
99<screen><userinput remap="make">make</userinput></screen>
100
101 <important>
102 <para>In this section, the test suite for Glibc is considered critical.
103 Do not skip it under any circumstance.</para>
104 </important>
105
106 <para>Generally a few tests do not pass, but you can generally ignore
107 any of the test failures listed below. Now test the build results:</para>
108
109<screen><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log
110grep Error glibc-check-log</userinput></screen>
111
112 <para>You will probably see an expected (ignored) failure in the
113 <emphasis>posix/annexc</emphasis> and
114 <emphasis>conform/run-conformtest</emphasis> tests. In addition the Glibc
115 test suite is somewhat dependent on the host system. This is a list of the
116 most common issues:</para>
117
118 <itemizedlist>
119
120 <listitem>
121 <para>The <emphasis>nptl/tst-clock2</emphasis>,
122 <emphasis>nptl/tst-attr3</emphasis>,
123 <emphasis>tst/tst-cputimer1</emphasis>, and
124 <emphasis>rt/tst-cpuclock2</emphasis>
125 tests have been known to fail. The
126 reason is not completely understood, but indications are that minor
127 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 genuine Intel or
133 authentic AMD processor.</para>
134 </listitem>
135
136 <listitem>
137 <para>When running on older and slower hardware or on systems under
138 load, some tests can fail because of test timeouts being exceeded.
139 Modifying the make check command to set a TIMEOUTFACTOR is reported to
140 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
141 make -k check</command>).</para>
142 </listitem>
143
144 <listitem>
145 <para>posix/tst-getaddrinfo4 will always fail due to not having a network
146 connection when the test is run.</para>
147 </listitem>
148
149 <listitem>
150 <para>Other tests known to fail on some architectures are posix/bug-regex32,
151 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, and stdio-common/bug22.</para>
152 </listitem>
153
154 </itemizedlist>
155
156 <para>Though it is a harmless message, the install stage of Glibc will
157 complain about the absence of <filename>/etc/ld.so.conf</filename>.
158 Prevent this warning with:</para>
159
160<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
161
162 <para>Install the package:</para>
163
164<screen><userinput remap="install">make install</userinput></screen>
165
166 <para>Install NIS and RPC related headers that are not installed by
167 default; these are required to rebuild glibc and by several BLFS
168 packages:</para>
169
170<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/sunrpc/rpc/*.h /usr/include/rpc
171cp -v ../glibc-&glibc-version;/sunrpc/rpcsvc/*.h /usr/include/rpcsvc
172cp -v ../glibc-&glibc-version;/nis/rpcsvc/*.h /usr/include/rpcsvc</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 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
242 because, although Glibc provides defaults when this file is missing or corrupt,
243 the Glibc defaults do not work well in a networked environment. The time zone
244 also needs to be configured.</para>
245
246 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
247 following:</para>
248
249<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
250<literal># Begin /etc/nsswitch.conf
251
252passwd: files
253group: files
254shadow: files
255
256hosts: files dns
257networks: files
258
259protocols: files
260services: files
261ethers: files
262rpc: files
263
264# End /etc/nsswitch.conf</literal>
265EOF</userinput></screen>
266
267 <para>Install timezone data:</para>
268<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
269
270ZONEINFO=/usr/share/zoneinfo
271mkdir -pv $ZONEINFO/{posix,right}
272
273for tz in etcetera southamerica northamerica europe africa antarctica \
274 asia australasia backward pacificnew solar87 solar88 solar89 \
275 systemv; do
276 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
277 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
278 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
279done
280
281cp -v zone.tab iso3166.tab $ZONEINFO
282zic -d $ZONEINFO -p America/New_York
283unset ZONEINFO</userinput></screen>
284
285 <variablelist>
286 <title>The meaning of the zic commands:</title>
287
288 <varlistentry>
289 <term><parameter>zic -L /dev/null ...</parameter></term>
290 <listitem>
291 <para>This creates posix timezones, without any leap seconds. It is
292 conventional to put these in both
293 <filename class="directory">zoneinfo</filename> and
294 <filename class="directory">zoneinfo/posix</filename>. It is
295 necessary to put the POSIX timezones in
296 <filename class="directory">zoneinfo</filename>, otherwise various
297 test-suites will report errors. On an embedded system, where space is
298 tight and you do not intend to ever update the timezones, you could save
299 1.9MB by not using the <filename class="directory">posix</filename>
300 directory, but some applications or test-suites might give less good
301 results</para>
302 </listitem>
303 </varlistentry>
304 <varlistentry>
305 <term><parameter>zic -L leapseconds ...</parameter></term>
306 <listitem>
307 <para>This creates right timezones, including leap seconds. On an
308 embedded system, where space is tight and you do not intend to
309 ever update the timezones, or care about the correct time, you could
310 save 1.9MB by omitting the <filename class="directory">right</filename>
311 directory.</para>
312 </listitem>
313 </varlistentry>
314 <varlistentry>
315 <term><parameter>zic ... -p ...</parameter></term>
316 <listitem>
317 <para>This creates the <filename>posixrules</filename> file. We use
318 New York because POSIX requires the daylight savings time rules
319 to be in accordance with US rules.</para>
320 </listitem>
321 </varlistentry>
322 </variablelist>
323
324
325 <para>One way to determine the local time zone is to run the following
326 script:</para>
327
328<screen role="nodump"><userinput>tzselect</userinput></screen>
329
330 <para>After answering a few questions about the location, the script will
331 output the name of the time zone (e.g.,
332 <emphasis>America/Edmonton</emphasis>). There are also some other possible
333 timezones listed in <filename
334 class='directory'>/usr/share/zoneinfo</filename> such as
335 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
336 are not identified by the script but can be used.</para>
337
338 <para>Then create the <filename>/etc/localtime</filename> file by
339 running:</para>
340
341<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
342 /etc/localtime</userinput></screen>
343
344 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
345 time zone selected (e.g., Canada/Eastern).</para>
346
347 <variablelist>
348 <title>The meaning of the cp option:</title>
349
350 <varlistentry>
351 <term><parameter>--remove-destination</parameter></term>
352 <listitem>
353 <para>This is needed to force removal of the already existing symbolic
354 link. The reason for copying the file instead of using a symlink is to
355 cover the situation where <filename class="directory">/usr</filename>
356 is on a separate partition. This could be important when booted into
357 single user mode.</para>
358 </listitem>
359 </varlistentry>
360
361 </variablelist>
362
363 </sect2>
364
365 <sect2 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 </sect2>
409
410 <sect2 id="contents-glibc" role="content">
411 <title>Contents of Glibc</title>
412
413 <segmentedlist>
414 <segtitle>Installed programs</segtitle>
415 <segtitle>Installed libraries</segtitle>
416 <segtitle>Installed directories</segtitle>
417
418 <seglistitem>
419 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
420 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
421 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
422 zdump, and zic</seg>
423 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
424 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
425 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
426 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
427 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
428 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
429 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
430 libthread_db.so, and libutil.{a,so}</seg>
431 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
432 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
433 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
434 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
435 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
436 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
437 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/glibc,
438 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo, /var/db</seg>
439 </seglistitem>
440 </segmentedlist>
441
442 <variablelist>
443 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
444 <?dbfo list-presentation="list"?>
445 <?dbhtml list-presentation="table"?>
446
447 <varlistentry id="catchsegv">
448 <term><command>catchsegv</command></term>
449 <listitem>
450 <para>Can be used to create a stack trace when a program
451 terminates with a segmentation fault</para>
452 <indexterm zone="ch-system-glibc catchsegv">
453 <primary sortas="b-catchsegv">catchsegv</primary>
454 </indexterm>
455 </listitem>
456 </varlistentry>
457
458 <varlistentry id="gencat">
459 <term><command>gencat</command></term>
460 <listitem>
461 <para>Generates message catalogues</para>
462 <indexterm zone="ch-system-glibc gencat">
463 <primary sortas="b-gencat">gencat</primary>
464 </indexterm>
465 </listitem>
466 </varlistentry>
467
468 <varlistentry id="getconf">
469 <term><command>getconf</command></term>
470 <listitem>
471 <para>Displays the system configuration values for file system
472 specific variables</para>
473 <indexterm zone="ch-system-glibc getconf">
474 <primary sortas="b-getconf">getconf</primary>
475 </indexterm>
476 </listitem>
477 </varlistentry>
478
479 <varlistentry id="getent">
480 <term><command>getent</command></term>
481 <listitem>
482 <para>Gets entries from an administrative database</para>
483 <indexterm zone="ch-system-glibc getent">
484 <primary sortas="b-getent">getent</primary>
485 </indexterm>
486 </listitem>
487 </varlistentry>
488
489 <varlistentry id="iconv">
490 <term><command>iconv</command></term>
491 <listitem>
492 <para>Performs character set conversion</para>
493 <indexterm zone="ch-system-glibc iconv">
494 <primary sortas="b-iconv">iconv</primary>
495 </indexterm>
496 </listitem>
497 </varlistentry>
498
499 <varlistentry id="iconvconfig">
500 <term><command>iconvconfig</command></term>
501 <listitem>
502 <para>Creates fastloading <command>iconv</command> module configuration
503 files</para>
504 <indexterm zone="ch-system-glibc iconvconfig">
505 <primary sortas="b-iconvconfig">iconvconfig</primary>
506 </indexterm>
507 </listitem>
508 </varlistentry>
509
510 <varlistentry id="ldconfig">
511 <term><command>ldconfig</command></term>
512 <listitem>
513 <para>Configures the dynamic linker runtime bindings</para>
514 <indexterm zone="ch-system-glibc ldconfig">
515 <primary sortas="b-ldconfig">ldconfig</primary>
516 </indexterm>
517 </listitem>
518 </varlistentry>
519
520 <varlistentry id="ldd">
521 <term><command>ldd</command></term>
522 <listitem>
523 <para>Reports which shared libraries are required
524 by each given program or shared library</para>
525 <indexterm zone="ch-system-glibc ldd">
526 <primary sortas="b-ldd">ldd</primary>
527 </indexterm>
528 </listitem>
529 </varlistentry>
530
531 <varlistentry id="lddlibc4">
532 <term><command>lddlibc4</command></term>
533 <listitem>
534 <para>Assists <command>ldd</command> with object files</para>
535 <indexterm zone="ch-system-glibc lddlibc4">
536 <primary sortas="b-lddlibc4">lddlibc4</primary>
537 </indexterm>
538 </listitem>
539 </varlistentry>
540
541 <varlistentry id="locale">
542 <term><command>locale</command></term>
543 <listitem>
544 <para>Prints various information about the current locale</para>
545 <indexterm zone="ch-system-glibc locale">
546 <primary sortas="b-locale">locale</primary>
547 </indexterm>
548 </listitem>
549 </varlistentry>
550
551 <varlistentry id="localedef">
552 <term><command>localedef</command></term>
553 <listitem>
554 <para>Compiles locale specifications</para>
555 <indexterm zone="ch-system-glibc localedef">
556 <primary sortas="b-localedef">localedef</primary>
557 </indexterm>
558 </listitem>
559 </varlistentry>
560
561 <varlistentry id="makedb">
562 <term><command>makedb</command></term>
563 <listitem>
564 <para>Creates a simple database from textual input</para>
565 <indexterm zone="ch-system-glibc makedb">
566 <primary sortas="b-makedb">makedb</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="mtrace">
572 <term><command>mtrace</command></term>
573 <listitem>
574 <para>Reads and interprets a memory trace file and displays a summary
575 in human-readable format</para>
576 <indexterm zone="ch-system-glibc mtrace">
577 <primary sortas="b-mtrace">mtrace</primary>
578 </indexterm>
579 </listitem>
580 </varlistentry>
581
582 <varlistentry id="nscd">
583 <term><command>nscd</command></term>
584 <listitem>
585 <para>A daemon that provides a cache for the most common name
586 service requests</para>
587 <indexterm zone="ch-system-glibc nscd">
588 <primary sortas="b-nscd">nscd</primary>
589 </indexterm>
590 </listitem>
591 </varlistentry>
592
593 <varlistentry id="pcprofiledump">
594 <term><command>pcprofiledump</command></term>
595 <listitem>
596 <para>Dumps information generated by PC profiling</para>
597 <indexterm zone="ch-system-glibc pcprofiledump">
598 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
599 </indexterm>
600 </listitem>
601 </varlistentry>
602
603 <varlistentry id="pldd">
604 <term><command>pldd</command></term>
605 <listitem>
606 <para>Lists dynamic shared objects used by running processes</para>
607 <indexterm zone="ch-system-glibc pldd">
608 <primary sortas="b-pldd">pldd</primary>
609 </indexterm>
610 </listitem>
611 </varlistentry>
612<!--
613 <varlistentry id="pt_chown">
614 <term><command>pt_chown</command></term>
615 <listitem>
616 <para>A helper program for <command>grantpt</command> to set the owner,
617 group and access permissions of a slave pseudo terminal</para>
618 <indexterm zone="ch-system-glibc pt_chown">
619 <primary sortas="b-pt_chown">pt_chown</primary>
620 </indexterm>
621 </listitem>
622 </varlistentry>
623-->
624 <varlistentry id="rpcgen">
625 <term><command>rpcgen</command></term>
626 <listitem>
627 <para>Generates C code to implement the Remote Procedure Call (RPC)
628 protocol</para>
629 <indexterm zone="ch-system-glibc rpcgen">
630 <primary sortas="b-rpcgen">rpcgen</primary>
631 </indexterm>
632 </listitem>
633 </varlistentry>
634
635 <varlistentry id="sln">
636 <term><command>sln</command></term>
637 <listitem>
638 <para>A statically linked <command>ln</command> program</para>
639 <indexterm zone="ch-system-glibc sln">
640 <primary sortas="b-sln">sln</primary>
641 </indexterm>
642 </listitem>
643 </varlistentry>
644
645 <varlistentry id="sotruss">
646 <term><command>sotruss</command></term>
647 <listitem>
648 <para>Traces shared library procedure calls of a specified command</para>
649 <indexterm zone="ch-system-glibc sotruss">
650 <primary sortas="b-sotruss">sotruss</primary>
651 </indexterm>
652 </listitem>
653 </varlistentry>
654
655 <varlistentry id="sprof">
656 <term><command>sprof</command></term>
657 <listitem>
658 <para>Reads and displays shared object profiling data</para>
659 <indexterm zone="ch-system-glibc sprof">
660 <primary sortas="b-sprof">sprof</primary>
661 </indexterm>
662 </listitem>
663 </varlistentry>
664
665 <varlistentry id="tzselect">
666 <term><command>tzselect</command></term>
667 <listitem>
668 <para>Asks the user about the location of the system and reports
669 the corresponding time zone description</para>
670 <indexterm zone="ch-system-glibc tzselect">
671 <primary sortas="b-tzselect">tzselect</primary>
672 </indexterm>
673 </listitem>
674 </varlistentry>
675
676 <varlistentry id="xtrace">
677 <term><command>xtrace</command></term>
678 <listitem>
679 <para>Traces the execution of a program by printing the currently
680 executed function</para>
681 <indexterm zone="ch-system-glibc xtrace">
682 <primary sortas="b-xtrace">xtrace</primary>
683 </indexterm>
684 </listitem>
685 </varlistentry>
686
687 <varlistentry id="zdump">
688 <term><command>zdump</command></term>
689 <listitem>
690 <para>The time zone dumper</para>
691 <indexterm zone="ch-system-glibc zdump">
692 <primary sortas="b-zdump">zdump</primary>
693 </indexterm>
694 </listitem>
695 </varlistentry>
696
697 <varlistentry id="zic">
698 <term><command>zic</command></term>
699 <listitem>
700 <para>The time zone compiler</para>
701 <indexterm zone="ch-system-glibc zic">
702 <primary sortas="b-zic">zic</primary>
703 </indexterm>
704 </listitem>
705 </varlistentry>
706
707 <varlistentry id="ld.so">
708 <term><filename class="libraryfile">ld.so</filename></term>
709 <listitem>
710 <para>The helper program for shared library executables</para>
711 <indexterm zone="ch-system-glibc ld.so">
712 <primary sortas="c-ld.so">ld.so</primary>
713 </indexterm>
714 </listitem>
715 </varlistentry>
716
717 <varlistentry id="libBrokenLocale">
718 <term><filename class="libraryfile">libBrokenLocale</filename></term>
719 <listitem>
720 <para>Used internally by Glibc as a gross hack to get broken programs
721 (e.g., some Motif applications) running. See comments in
722 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
723 for more information</para>
724 <indexterm zone="ch-system-glibc libBrokenLocale">
725 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
726 </indexterm>
727 </listitem>
728 </varlistentry>
729
730 <varlistentry id="libSegFault">
731 <term><filename class="libraryfile">libSegFault</filename></term>
732 <listitem>
733 <para>The segmentation fault signal handler, used by
734 <command>catchsegv</command></para>
735 <indexterm zone="ch-system-glibc libSegFault">
736 <primary sortas="c-libSegFault">libSegFault</primary>
737 </indexterm>
738 </listitem>
739 </varlistentry>
740
741 <varlistentry id="libanl">
742 <term><filename class="libraryfile">libanl</filename></term>
743 <listitem>
744 <para>An asynchronous name lookup library</para>
745 <indexterm zone="ch-system-glibc libanl">
746 <primary sortas="c-libanl">libanl</primary>
747 </indexterm>
748 </listitem>
749 </varlistentry>
750
751 <varlistentry id="libbsd-compat">
752 <term><filename class="libraryfile">libbsd-compat</filename></term>
753 <listitem>
754 <para>Provides the portability needed in order to run certain
755 Berkeley Software Distribution (BSD) programs under Linux</para>
756 <indexterm zone="ch-system-glibc libbsd-compat">
757 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
758 </indexterm>
759 </listitem>
760 </varlistentry>
761
762 <varlistentry id="libc">
763 <term><filename class="libraryfile">libc</filename></term>
764 <listitem>
765 <para>The main C library</para>
766 <indexterm zone="ch-system-glibc libc">
767 <primary sortas="c-libc">libc</primary>
768 </indexterm>
769 </listitem>
770 </varlistentry>
771
772 <varlistentry id="libcidn">
773 <term><filename class="libraryfile">libcidn</filename></term>
774 <listitem>
775 <para>Used internally by Glibc for handling internationalized domain
776 names in the <function>getaddrinfo()</function> function</para>
777 <indexterm zone="ch-system-glibc libcidn">
778 <primary sortas="c-libcidn">libcidn</primary>
779 </indexterm>
780 </listitem>
781 </varlistentry>
782
783 <varlistentry id="libcrypt">
784 <term><filename class="libraryfile">libcrypt</filename></term>
785 <listitem>
786 <para>The cryptography library</para>
787 <indexterm zone="ch-system-glibc libcrypt">
788 <primary sortas="c-libcrypt">libcrypt</primary>
789 </indexterm>
790 </listitem>
791 </varlistentry>
792
793 <varlistentry id="libdl">
794 <term><filename class="libraryfile">libdl</filename></term>
795 <listitem>
796 <para>The dynamic linking interface library</para>
797 <indexterm zone="ch-system-glibc libdl">
798 <primary sortas="c-libdl">libdl</primary>
799 </indexterm>
800 </listitem>
801 </varlistentry>
802
803 <varlistentry id="libg">
804 <term><filename class="libraryfile">libg</filename></term>
805 <listitem>
806 <para>Dummy library containing no functions. Previously was a runtime
807 library for <command>g++</command></para>
808 <indexterm zone="ch-system-glibc libg">
809 <primary sortas="c-libg">libg</primary>
810 </indexterm>
811 </listitem>
812 </varlistentry>
813
814 <varlistentry id="libieee">
815 <term><filename class="libraryfile">libieee</filename></term>
816 <listitem>
817 <para>Linking in this module forces error handling rules for math
818 functions as defined by the Institute of Electrical and Electronic
819 Engineers (IEEE). The default is POSIX.1 error handling</para>
820 <indexterm zone="ch-system-glibc libieee">
821 <primary sortas="c-libieee">libieee</primary>
822 </indexterm>
823 </listitem>
824 </varlistentry>
825
826 <varlistentry id="libm">
827 <term><filename class="libraryfile">libm</filename></term>
828 <listitem>
829 <para>The mathematical library</para>
830 <indexterm zone="ch-system-glibc libm">
831 <primary sortas="c-libm">libm</primary>
832 </indexterm>
833 </listitem>
834 </varlistentry>
835
836 <varlistentry id="libmcheck">
837 <term><filename class="libraryfile">libmcheck</filename></term>
838 <listitem>
839 <para>Turns on memory allocation checking when linked to</para>
840 <indexterm zone="ch-system-glibc libmcheck">
841 <primary sortas="c-libmcheck">libmcheck</primary>
842 </indexterm>
843 </listitem>
844 </varlistentry>
845
846 <varlistentry id="libmemusage">
847 <term><filename class="libraryfile">libmemusage</filename></term>
848 <listitem>
849 <para>Used by <command>memusage</command> to help collect
850 information about the memory usage of a program</para>
851 <indexterm zone="ch-system-glibc libmemusage">
852 <primary sortas="c-libmemusage">libmemusage</primary>
853 </indexterm>
854 </listitem>
855 </varlistentry>
856
857 <varlistentry id="libnsl">
858 <term><filename class="libraryfile">libnsl</filename></term>
859 <listitem>
860 <para>The network services library</para>
861 <indexterm zone="ch-system-glibc libnsl">
862 <primary sortas="c-libnsl">libnsl</primary>
863 </indexterm>
864 </listitem>
865 </varlistentry>
866
867 <varlistentry id="libnss">
868 <term><filename class="libraryfile">libnss</filename></term>
869 <listitem>
870 <para>The Name Service Switch libraries, containing functions for
871 resolving host names, user names, group names, aliases, services,
872 protocols, etc.</para>
873 <indexterm zone="ch-system-glibc libnss">
874 <primary sortas="c-libnss">libnss</primary>
875 </indexterm>
876 </listitem>
877 </varlistentry>
878
879 <varlistentry id="libpcprofile">
880 <term><filename class="libraryfile">libpcprofile</filename></term>
881 <listitem>
882 <para>Contains profiling functions used to track the amount of CPU
883 time spent in specific source code lines</para>
884 <indexterm zone="ch-system-glibc libpcprofile">
885 <primary sortas="c-libpcprofile">libpcprofile</primary>
886 </indexterm>
887 </listitem>
888 </varlistentry>
889
890 <varlistentry id="libpthread">
891 <term><filename class="libraryfile">libpthread</filename></term>
892 <listitem>
893 <para>The POSIX threads library</para>
894 <indexterm zone="ch-system-glibc libpthread">
895 <primary sortas="c-libpthread">libpthread</primary>
896 </indexterm>
897 </listitem>
898 </varlistentry>
899
900 <varlistentry id="libresolv">
901 <term><filename class="libraryfile">libresolv</filename></term>
902 <listitem>
903 <para>Contains functions for creating, sending, and interpreting
904 packets to the Internet domain name servers</para>
905 <indexterm zone="ch-system-glibc libresolv">
906 <primary sortas="c-libresolv">libresolv</primary>
907 </indexterm>
908 </listitem>
909 </varlistentry>
910
911 <varlistentry id="librpcsvc">
912 <term><filename class="libraryfile">librpcsvc</filename></term>
913 <listitem>
914 <para>Contains functions providing miscellaneous RPC services</para>
915 <indexterm zone="ch-system-glibc librpcsvc">
916 <primary sortas="c-librpcsvc">librpcsvc</primary>
917 </indexterm>
918 </listitem>
919 </varlistentry>
920
921 <varlistentry id="librt">
922 <term><filename class="libraryfile">librt</filename></term>
923 <listitem>
924 <para>Contains functions providing most of the interfaces specified
925 by the POSIX.1b Realtime Extension</para>
926 <indexterm zone="ch-system-glibc librt">
927 <primary sortas="c-librt">librt</primary>
928 </indexterm>
929 </listitem>
930 </varlistentry>
931
932 <varlistentry id="libthread_db">
933 <term><filename class="libraryfile">libthread_db</filename></term>
934 <listitem>
935 <para>Contains functions useful for building debuggers for
936 multi-threaded programs</para>
937 <indexterm zone="ch-system-glibc libthread_db">
938 <primary sortas="c-libthread_db">libthread_db</primary>
939 </indexterm>
940 </listitem>
941 </varlistentry>
942
943 <varlistentry id="libutil">
944 <term><filename class="libraryfile">libutil</filename></term>
945 <listitem>
946 <para>Contains code for <quote>standard</quote> functions used in
947 many different Unix utilities</para>
948 <indexterm zone="ch-system-glibc libutil">
949 <primary sortas="c-libutil">libutil</primary>
950 </indexterm>
951 </listitem>
952 </varlistentry>
953
954 </variablelist>
955
956 </sect2>
957
958</sect1>
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