source: chapter06/glibc.xml@ 05e908ed

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Last change on this file since 05e908ed was 05e908ed, checked in by Matthew Burgess <matthew@…>, 11 years ago

Update to Make-4.0. Fixes #3410.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10359 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-system-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Glibc package contains the main C library. This library provides
27 the basic routines for allocating memory, searching directories, opening and
28 closing files, reading and writing files, string handling, pattern matching,
29 arithmetic, and so on.</para>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-ch6-sbu;</seg>
37 <seg>&glibc-ch6-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <note>
47 <para>Some packages outside of LFS suggest installing GNU libiconv in
48 order to translate data from one encoding to another. The project's
49 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
50 <quote>This library provides an <function>iconv()</function>
51 implementation, for use on systems which don't have one, or whose
52 implementation cannot convert from/to Unicode.</quote> Glibc provides
53 an <function>iconv()</function> implementation and can convert from/to
54 Unicode, therefore libiconv is not required on an LFS system.</para>
55 </note>
56
57 <para>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 <para>Allow Glibc to be built with Make-&make-version;:</para>
69
70<screen><userinput remap="pre">sed -r -i 's/(3..89..)/\1 | 4.*/' configure</userinput></screen>
71
72 <para>The Glibc documentation recommends building Glibc outside of the source
73 directory in a dedicated build directory:</para>
74
75<screen><userinput remap="pre">mkdir -v ../glibc-build
76cd ../glibc-build</userinput></screen>
77
78 <para>Prepare Glibc for compilation:</para>
79
80<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
81 --prefix=/usr \
82 --disable-profile \
83 --enable-kernel=&min-kernel; \
84 --libexecdir=/usr/lib/glibc</userinput></screen>
85
86 <variablelist>
87 <title>The meaning of the new configure options:</title>
88
89 <varlistentry>
90 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
91 <listitem>
92 <para>This changes the location of some auxillary files from the
93 default of <filename class="directory">/usr/libexec</filename> to
94 <filename class="directory">/usr/lib/glibc</filename>.</para>
95 </listitem>
96 </varlistentry>
97
98 </variablelist>
99
100 <para>Compile the package:</para>
101
102<screen><userinput remap="make">make</userinput></screen>
103
104 <important>
105 <para>In this section, the test suite for Glibc is considered critical.
106 Do not skip it under any circumstance.</para>
107 </important>
108
109 <para>Generally a few tests do not pass, but you can generally ignore
110 any of the test failures listed below. Now test the build results:</para>
111
112<screen><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log
113grep Error glibc-check-log</userinput></screen>
114
115 <para>You will probably see an expected (ignored) failure in the
116 <emphasis>posix/annexc</emphasis> and
117 <emphasis>conform/run-conformtest</emphasis> tests. In addition the Glibc
118 test suite is somewhat dependent on the host system. This is a list of the
119 most common issues:</para>
120
121 <itemizedlist>
122
123 <listitem>
124 <para>The <emphasis>nptl/tst-clock2</emphasis>,
125 <emphasis>nptl/tst-attr3</emphasis>,
126 <emphasis>tst/tst-cputimer1</emphasis>, and
127 <emphasis>rt/tst-cpuclock2</emphasis>
128 tests have been known to fail. The
129 reason is not completely understood, but indications are that minor
130 timing issues can trigger these failures.</para>
131 </listitem>
132
133 <listitem>
134 <para>The math tests sometimes fail when running on
135 systems where the CPU is not a relatively new genuine Intel or
136 authentic AMD processor.</para>
137 </listitem>
138
139 <listitem>
140 <para>When running on older and slower hardware or on systems under
141 load, some tests can fail because of test timeouts being exceeded.
142 Modifying the make check command to set a TIMEOUTFACTOR is reported to
143 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
144 make -k check</command>).</para>
145 </listitem>
146
147 <listitem>
148 <para>posix/tst-getaddrinfo4 will always fail due to not having a network
149 connection when the test is run.</para>
150 </listitem>
151
152 <listitem>
153 <para>Other tests known to fail on some architectures are posix/bug-regex32,
154 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, and stdio-common/bug22.</para>
155 </listitem>
156
157 </itemizedlist>
158
159 <para>Though it is a harmless message, the install stage of Glibc will
160 complain about the absence of <filename>/etc/ld.so.conf</filename>.
161 Prevent this warning with:</para>
162
163<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
164
165 <para>Install the package:</para>
166
167<screen><userinput remap="install">make install</userinput></screen>
168
169 <para>Install NIS and RPC related headers that are not installed by
170 default; these are required to rebuild glibc and by several BLFS
171 packages:</para>
172
173<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/sunrpc/rpc/*.h /usr/include/rpc
174cp -v ../glibc-&glibc-version;/sunrpc/rpcsvc/*.h /usr/include/rpcsvc
175cp -v ../glibc-&glibc-version;/nis/rpcsvc/*.h /usr/include/rpcsvc</userinput></screen>
176
177 <para>The locales that can make the system respond in a different language
178 were not installed by the above command. None of the locales are required,
179 but if some of them are missing, test suites of the future packages would
180 skip important testcases.</para>
181
182 <para>Individual locales can be installed using the
183 <command>localedef</command> program. E.g., the first
184 <command>localedef</command> command below combines the
185 <filename>/usr/share/i18n/locales/cs_CZ</filename>
186 charset-independent locale definition with the
187 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
188 charmap definition and appends the result to the
189 <filename>/usr/lib/locale/locale-archive</filename> file.
190 The following instructions will install the minimum set of
191 locales necessary for the optimal coverage of tests:</para>
192
193<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
194localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
195localedef -i de_DE -f ISO-8859-1 de_DE
196localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
197localedef -i de_DE -f UTF-8 de_DE.UTF-8
198localedef -i en_GB -f UTF-8 en_GB.UTF-8
199localedef -i en_HK -f ISO-8859-1 en_HK
200localedef -i en_PH -f ISO-8859-1 en_PH
201localedef -i en_US -f ISO-8859-1 en_US
202localedef -i en_US -f UTF-8 en_US.UTF-8
203localedef -i es_MX -f ISO-8859-1 es_MX
204localedef -i fa_IR -f UTF-8 fa_IR
205localedef -i fr_FR -f ISO-8859-1 fr_FR
206localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
207localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
208localedef -i it_IT -f ISO-8859-1 it_IT
209localedef -i it_IT -f UTF-8 it_IT.UTF-8
210localedef -i ja_JP -f EUC-JP ja_JP
211localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
212localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
213localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
214localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
215
216 <para>In addition, install the locale for your own country, language and
217 character set.</para>
218
219 <para>Alternatively, install all locales listed in the
220 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
221 (it includes every locale listed above and many more) at once with the
222 following time-consuming command:</para>
223
224<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
225
226 <para>Then use the <command>localedef</command> command to create and
227 install locales not listed in the
228 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
229 in the unlikely case you need them.</para>
230
231 </sect2>
232
233 <sect2 id="conf-glibc" role="configuration">
234 <title>Configuring Glibc</title>
235
236 <indexterm zone="conf-glibc">
237 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
238 </indexterm>
239
240 <indexterm zone="conf-glibc">
241 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
242 </indexterm>
243
244 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
245 because, although Glibc provides defaults when this file is missing or corrupt,
246 the Glibc defaults do not work well in a networked environment. The time zone
247 also needs to be configured.</para>
248
249 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
250 following:</para>
251
252<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
253<literal># Begin /etc/nsswitch.conf
254
255passwd: files
256group: files
257shadow: files
258
259hosts: files dns
260networks: files
261
262protocols: files
263services: files
264ethers: files
265rpc: files
266
267# End /etc/nsswitch.conf</literal>
268EOF</userinput></screen>
269
270 <para>Install timezone data:</para>
271<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
272
273ZONEINFO=/usr/share/zoneinfo
274mkdir -pv $ZONEINFO/{posix,right}
275
276for tz in etcetera southamerica northamerica europe africa antarctica \
277 asia australasia backward pacificnew solar87 solar88 solar89 \
278 systemv; do
279 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
280 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
281 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
282done
283
284cp -v zone.tab iso3166.tab $ZONEINFO
285zic -d $ZONEINFO -p America/New_York
286unset ZONEINFO</userinput></screen>
287
288 <variablelist>
289 <title>The meaning of the zic commands:</title>
290
291 <varlistentry>
292 <term><parameter>zic -L /dev/null ...</parameter></term>
293 <listitem>
294 <para>This creates posix timezones, without any leap seconds. It is
295 conventional to put these in both
296 <filename class="directory">zoneinfo</filename> and
297 <filename class="directory">zoneinfo/posix</filename>. It is
298 necessary to put the POSIX timezones in
299 <filename class="directory">zoneinfo</filename>, otherwise various
300 test-suites will report errors. On an embedded system, where space is
301 tight and you do not intend to ever update the timezones, you could save
302 1.9MB by not using the <filename class="directory">posix</filename>
303 directory, but some applications or test-suites might give less good
304 results</para>
305 </listitem>
306 </varlistentry>
307 <varlistentry>
308 <term><parameter>zic -L leapseconds ...</parameter></term>
309 <listitem>
310 <para>This creates right timezones, including leap seconds. On an
311 embedded system, where space is tight and you do not intend to
312 ever update the timezones, or care about the correct time, you could
313 save 1.9MB by omitting the <filename class="directory">right</filename>
314 directory.</para>
315 </listitem>
316 </varlistentry>
317 <varlistentry>
318 <term><parameter>zic ... -p ...</parameter></term>
319 <listitem>
320 <para>This creates the <filename>posixrules</filename> file. We use
321 New York because POSIX requires the daylight savings time rules
322 to be in accordance with US rules.</para>
323 </listitem>
324 </varlistentry>
325 </variablelist>
326
327
328 <para>One way to determine the local time zone is to run the following
329 script:</para>
330
331<screen role="nodump"><userinput>tzselect</userinput></screen>
332
333 <para>After answering a few questions about the location, the script will
334 output the name of the time zone (e.g.,
335 <emphasis>America/Edmonton</emphasis>). There are also some other possible
336 timezones listed in <filename
337 class='directory'>/usr/share/zoneinfo</filename> such as
338 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
339 are not identified by the script but can be used.</para>
340
341 <para>Then create the <filename>/etc/localtime</filename> file by
342 running:</para>
343
344<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
345 /etc/localtime</userinput></screen>
346
347 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
348 time zone selected (e.g., Canada/Eastern).</para>
349
350 <variablelist>
351 <title>The meaning of the cp option:</title>
352
353 <varlistentry>
354 <term><parameter>--remove-destination</parameter></term>
355 <listitem>
356 <para>This is needed to force removal of the already existing symbolic
357 link. The reason for copying the file instead of using a symlink is to
358 cover the situation where <filename class="directory">/usr</filename>
359 is on a separate partition. This could be important when booted into
360 single user mode.</para>
361 </listitem>
362 </varlistentry>
363
364 </variablelist>
365
366 </sect2>
367
368 <sect2 id="conf-ld" role="configuration">
369 <title>Configuring the Dynamic Loader</title>
370
371 <indexterm zone="conf-ld">
372 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
373 </indexterm>
374
375 <para>By default, the dynamic loader (<filename
376 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
377 <filename class="directory">/lib</filename> and <filename
378 class="directory">/usr/lib</filename> for dynamic libraries that are
379 needed by programs as they are run. However, if there are libraries in
380 directories other than <filename class="directory">/lib</filename> and
381 <filename class="directory">/usr/lib</filename>, these need to be added
382 to the <filename>/etc/ld.so.conf</filename> file in order for the
383 dynamic loader to find them. Two directories that are commonly known
384 to contain additional libraries are <filename
385 class="directory">/usr/local/lib</filename> and <filename
386 class="directory">/opt/lib</filename>, so add those directories to the
387 dynamic loader's search path.</para>
388
389 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
390 following:</para>
391
392<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
393<literal># Begin /etc/ld.so.conf
394/usr/local/lib
395/opt/lib
396</literal>
397EOF</userinput></screen>
398
399 <para>If desired, the dynamic loader can also search a directory and
400 include the contents of files found there. Generally the files in
401 this include directory are one line specifying the desired library path.
402 To add this capability run the following commands:</para>
403
404<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
405<literal># Add an include directory
406include /etc/ld.so.conf.d/*.conf
407</literal>
408EOF
409mkdir -pv /etc/ld.so.conf.d</userinput></screen>
410
411 </sect2>
412
413 <sect2 id="contents-glibc" role="content">
414 <title>Contents of Glibc</title>
415
416 <segmentedlist>
417 <segtitle>Installed programs</segtitle>
418 <segtitle>Installed libraries</segtitle>
419 <segtitle>Installed directories</segtitle>
420
421 <seglistitem>
422 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
423 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
424 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
425 zdump, and zic</seg>
426 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
427 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
428 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
429 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
430 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
431 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
432 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
433 libthread_db.so, and libutil.{a,so}</seg>
434 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
435 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
436 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
437 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
438 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
439 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
440 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/glibc,
441 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo, /var/db</seg>
442 </seglistitem>
443 </segmentedlist>
444
445 <variablelist>
446 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
447 <?dbfo list-presentation="list"?>
448 <?dbhtml list-presentation="table"?>
449
450 <varlistentry id="catchsegv">
451 <term><command>catchsegv</command></term>
452 <listitem>
453 <para>Can be used to create a stack trace when a program
454 terminates with a segmentation fault</para>
455 <indexterm zone="ch-system-glibc catchsegv">
456 <primary sortas="b-catchsegv">catchsegv</primary>
457 </indexterm>
458 </listitem>
459 </varlistentry>
460
461 <varlistentry id="gencat">
462 <term><command>gencat</command></term>
463 <listitem>
464 <para>Generates message catalogues</para>
465 <indexterm zone="ch-system-glibc gencat">
466 <primary sortas="b-gencat">gencat</primary>
467 </indexterm>
468 </listitem>
469 </varlistentry>
470
471 <varlistentry id="getconf">
472 <term><command>getconf</command></term>
473 <listitem>
474 <para>Displays the system configuration values for file system
475 specific variables</para>
476 <indexterm zone="ch-system-glibc getconf">
477 <primary sortas="b-getconf">getconf</primary>
478 </indexterm>
479 </listitem>
480 </varlistentry>
481
482 <varlistentry id="getent">
483 <term><command>getent</command></term>
484 <listitem>
485 <para>Gets entries from an administrative database</para>
486 <indexterm zone="ch-system-glibc getent">
487 <primary sortas="b-getent">getent</primary>
488 </indexterm>
489 </listitem>
490 </varlistentry>
491
492 <varlistentry id="iconv">
493 <term><command>iconv</command></term>
494 <listitem>
495 <para>Performs character set conversion</para>
496 <indexterm zone="ch-system-glibc iconv">
497 <primary sortas="b-iconv">iconv</primary>
498 </indexterm>
499 </listitem>
500 </varlistentry>
501
502 <varlistentry id="iconvconfig">
503 <term><command>iconvconfig</command></term>
504 <listitem>
505 <para>Creates fastloading <command>iconv</command> module configuration
506 files</para>
507 <indexterm zone="ch-system-glibc iconvconfig">
508 <primary sortas="b-iconvconfig">iconvconfig</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="ldconfig">
514 <term><command>ldconfig</command></term>
515 <listitem>
516 <para>Configures the dynamic linker runtime bindings</para>
517 <indexterm zone="ch-system-glibc ldconfig">
518 <primary sortas="b-ldconfig">ldconfig</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="ldd">
524 <term><command>ldd</command></term>
525 <listitem>
526 <para>Reports which shared libraries are required
527 by each given program or shared library</para>
528 <indexterm zone="ch-system-glibc ldd">
529 <primary sortas="b-ldd">ldd</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="lddlibc4">
535 <term><command>lddlibc4</command></term>
536 <listitem>
537 <para>Assists <command>ldd</command> with object files</para>
538 <indexterm zone="ch-system-glibc lddlibc4">
539 <primary sortas="b-lddlibc4">lddlibc4</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="locale">
545 <term><command>locale</command></term>
546 <listitem>
547 <para>Prints various information about the current locale</para>
548 <indexterm zone="ch-system-glibc locale">
549 <primary sortas="b-locale">locale</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="localedef">
555 <term><command>localedef</command></term>
556 <listitem>
557 <para>Compiles locale specifications</para>
558 <indexterm zone="ch-system-glibc localedef">
559 <primary sortas="b-localedef">localedef</primary>
560 </indexterm>
561 </listitem>
562 </varlistentry>
563
564 <varlistentry id="makedb">
565 <term><command>makedb</command></term>
566 <listitem>
567 <para>Creates a simple database from textual input</para>
568 <indexterm zone="ch-system-glibc makedb">
569 <primary sortas="b-makedb">makedb</primary>
570 </indexterm>
571 </listitem>
572 </varlistentry>
573
574 <varlistentry id="mtrace">
575 <term><command>mtrace</command></term>
576 <listitem>
577 <para>Reads and interprets a memory trace file and displays a summary
578 in human-readable format</para>
579 <indexterm zone="ch-system-glibc mtrace">
580 <primary sortas="b-mtrace">mtrace</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="nscd">
586 <term><command>nscd</command></term>
587 <listitem>
588 <para>A daemon that provides a cache for the most common name
589 service requests</para>
590 <indexterm zone="ch-system-glibc nscd">
591 <primary sortas="b-nscd">nscd</primary>
592 </indexterm>
593 </listitem>
594 </varlistentry>
595
596 <varlistentry id="pcprofiledump">
597 <term><command>pcprofiledump</command></term>
598 <listitem>
599 <para>Dumps information generated by PC profiling</para>
600 <indexterm zone="ch-system-glibc pcprofiledump">
601 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
602 </indexterm>
603 </listitem>
604 </varlistentry>
605
606 <varlistentry id="pldd">
607 <term><command>pldd</command></term>
608 <listitem>
609 <para>Lists dynamic shared objects used by running processes</para>
610 <indexterm zone="ch-system-glibc pldd">
611 <primary sortas="b-pldd">pldd</primary>
612 </indexterm>
613 </listitem>
614 </varlistentry>
615<!--
616 <varlistentry id="pt_chown">
617 <term><command>pt_chown</command></term>
618 <listitem>
619 <para>A helper program for <command>grantpt</command> to set the owner,
620 group and access permissions of a slave pseudo terminal</para>
621 <indexterm zone="ch-system-glibc pt_chown">
622 <primary sortas="b-pt_chown">pt_chown</primary>
623 </indexterm>
624 </listitem>
625 </varlistentry>
626-->
627 <varlistentry id="rpcgen">
628 <term><command>rpcgen</command></term>
629 <listitem>
630 <para>Generates C code to implement the Remote Procedure Call (RPC)
631 protocol</para>
632 <indexterm zone="ch-system-glibc rpcgen">
633 <primary sortas="b-rpcgen">rpcgen</primary>
634 </indexterm>
635 </listitem>
636 </varlistentry>
637
638 <varlistentry id="sln">
639 <term><command>sln</command></term>
640 <listitem>
641 <para>A statically linked <command>ln</command> program</para>
642 <indexterm zone="ch-system-glibc sln">
643 <primary sortas="b-sln">sln</primary>
644 </indexterm>
645 </listitem>
646 </varlistentry>
647
648 <varlistentry id="sotruss">
649 <term><command>sotruss</command></term>
650 <listitem>
651 <para>Traces shared library procedure calls of a specified command</para>
652 <indexterm zone="ch-system-glibc sotruss">
653 <primary sortas="b-sotruss">sotruss</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry>
657
658 <varlistentry id="sprof">
659 <term><command>sprof</command></term>
660 <listitem>
661 <para>Reads and displays shared object profiling data</para>
662 <indexterm zone="ch-system-glibc sprof">
663 <primary sortas="b-sprof">sprof</primary>
664 </indexterm>
665 </listitem>
666 </varlistentry>
667
668 <varlistentry id="tzselect">
669 <term><command>tzselect</command></term>
670 <listitem>
671 <para>Asks the user about the location of the system and reports
672 the corresponding time zone description</para>
673 <indexterm zone="ch-system-glibc tzselect">
674 <primary sortas="b-tzselect">tzselect</primary>
675 </indexterm>
676 </listitem>
677 </varlistentry>
678
679 <varlistentry id="xtrace">
680 <term><command>xtrace</command></term>
681 <listitem>
682 <para>Traces the execution of a program by printing the currently
683 executed function</para>
684 <indexterm zone="ch-system-glibc xtrace">
685 <primary sortas="b-xtrace">xtrace</primary>
686 </indexterm>
687 </listitem>
688 </varlistentry>
689
690 <varlistentry id="zdump">
691 <term><command>zdump</command></term>
692 <listitem>
693 <para>The time zone dumper</para>
694 <indexterm zone="ch-system-glibc zdump">
695 <primary sortas="b-zdump">zdump</primary>
696 </indexterm>
697 </listitem>
698 </varlistentry>
699
700 <varlistentry id="zic">
701 <term><command>zic</command></term>
702 <listitem>
703 <para>The time zone compiler</para>
704 <indexterm zone="ch-system-glibc zic">
705 <primary sortas="b-zic">zic</primary>
706 </indexterm>
707 </listitem>
708 </varlistentry>
709
710 <varlistentry id="ld.so">
711 <term><filename class="libraryfile">ld.so</filename></term>
712 <listitem>
713 <para>The helper program for shared library executables</para>
714 <indexterm zone="ch-system-glibc ld.so">
715 <primary sortas="c-ld.so">ld.so</primary>
716 </indexterm>
717 </listitem>
718 </varlistentry>
719
720 <varlistentry id="libBrokenLocale">
721 <term><filename class="libraryfile">libBrokenLocale</filename></term>
722 <listitem>
723 <para>Used internally by Glibc as a gross hack to get broken programs
724 (e.g., some Motif applications) running. See comments in
725 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
726 for more information</para>
727 <indexterm zone="ch-system-glibc libBrokenLocale">
728 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
729 </indexterm>
730 </listitem>
731 </varlistentry>
732
733 <varlistentry id="libSegFault">
734 <term><filename class="libraryfile">libSegFault</filename></term>
735 <listitem>
736 <para>The segmentation fault signal handler, used by
737 <command>catchsegv</command></para>
738 <indexterm zone="ch-system-glibc libSegFault">
739 <primary sortas="c-libSegFault">libSegFault</primary>
740 </indexterm>
741 </listitem>
742 </varlistentry>
743
744 <varlistentry id="libanl">
745 <term><filename class="libraryfile">libanl</filename></term>
746 <listitem>
747 <para>An asynchronous name lookup library</para>
748 <indexterm zone="ch-system-glibc libanl">
749 <primary sortas="c-libanl">libanl</primary>
750 </indexterm>
751 </listitem>
752 </varlistentry>
753
754 <varlistentry id="libbsd-compat">
755 <term><filename class="libraryfile">libbsd-compat</filename></term>
756 <listitem>
757 <para>Provides the portability needed in order to run certain
758 Berkeley Software Distribution (BSD) programs under Linux</para>
759 <indexterm zone="ch-system-glibc libbsd-compat">
760 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
761 </indexterm>
762 </listitem>
763 </varlistentry>
764
765 <varlistentry id="libc">
766 <term><filename class="libraryfile">libc</filename></term>
767 <listitem>
768 <para>The main C library</para>
769 <indexterm zone="ch-system-glibc libc">
770 <primary sortas="c-libc">libc</primary>
771 </indexterm>
772 </listitem>
773 </varlistentry>
774
775 <varlistentry id="libcidn">
776 <term><filename class="libraryfile">libcidn</filename></term>
777 <listitem>
778 <para>Used internally by Glibc for handling internationalized domain
779 names in the <function>getaddrinfo()</function> function</para>
780 <indexterm zone="ch-system-glibc libcidn">
781 <primary sortas="c-libcidn">libcidn</primary>
782 </indexterm>
783 </listitem>
784 </varlistentry>
785
786 <varlistentry id="libcrypt">
787 <term><filename class="libraryfile">libcrypt</filename></term>
788 <listitem>
789 <para>The cryptography library</para>
790 <indexterm zone="ch-system-glibc libcrypt">
791 <primary sortas="c-libcrypt">libcrypt</primary>
792 </indexterm>
793 </listitem>
794 </varlistentry>
795
796 <varlistentry id="libdl">
797 <term><filename class="libraryfile">libdl</filename></term>
798 <listitem>
799 <para>The dynamic linking interface library</para>
800 <indexterm zone="ch-system-glibc libdl">
801 <primary sortas="c-libdl">libdl</primary>
802 </indexterm>
803 </listitem>
804 </varlistentry>
805
806 <varlistentry id="libg">
807 <term><filename class="libraryfile">libg</filename></term>
808 <listitem>
809 <para>Dummy library containing no functions. Previously was a runtime
810 library for <command>g++</command></para>
811 <indexterm zone="ch-system-glibc libg">
812 <primary sortas="c-libg">libg</primary>
813 </indexterm>
814 </listitem>
815 </varlistentry>
816
817 <varlistentry id="libieee">
818 <term><filename class="libraryfile">libieee</filename></term>
819 <listitem>
820 <para>Linking in this module forces error handling rules for math
821 functions as defined by the Institute of Electrical and Electronic
822 Engineers (IEEE). The default is POSIX.1 error handling</para>
823 <indexterm zone="ch-system-glibc libieee">
824 <primary sortas="c-libieee">libieee</primary>
825 </indexterm>
826 </listitem>
827 </varlistentry>
828
829 <varlistentry id="libm">
830 <term><filename class="libraryfile">libm</filename></term>
831 <listitem>
832 <para>The mathematical library</para>
833 <indexterm zone="ch-system-glibc libm">
834 <primary sortas="c-libm">libm</primary>
835 </indexterm>
836 </listitem>
837 </varlistentry>
838
839 <varlistentry id="libmcheck">
840 <term><filename class="libraryfile">libmcheck</filename></term>
841 <listitem>
842 <para>Turns on memory allocation checking when linked to</para>
843 <indexterm zone="ch-system-glibc libmcheck">
844 <primary sortas="c-libmcheck">libmcheck</primary>
845 </indexterm>
846 </listitem>
847 </varlistentry>
848
849 <varlistentry id="libmemusage">
850 <term><filename class="libraryfile">libmemusage</filename></term>
851 <listitem>
852 <para>Used by <command>memusage</command> to help collect
853 information about the memory usage of a program</para>
854 <indexterm zone="ch-system-glibc libmemusage">
855 <primary sortas="c-libmemusage">libmemusage</primary>
856 </indexterm>
857 </listitem>
858 </varlistentry>
859
860 <varlistentry id="libnsl">
861 <term><filename class="libraryfile">libnsl</filename></term>
862 <listitem>
863 <para>The network services library</para>
864 <indexterm zone="ch-system-glibc libnsl">
865 <primary sortas="c-libnsl">libnsl</primary>
866 </indexterm>
867 </listitem>
868 </varlistentry>
869
870 <varlistentry id="libnss">
871 <term><filename class="libraryfile">libnss</filename></term>
872 <listitem>
873 <para>The Name Service Switch libraries, containing functions for
874 resolving host names, user names, group names, aliases, services,
875 protocols, etc.</para>
876 <indexterm zone="ch-system-glibc libnss">
877 <primary sortas="c-libnss">libnss</primary>
878 </indexterm>
879 </listitem>
880 </varlistentry>
881
882 <varlistentry id="libpcprofile">
883 <term><filename class="libraryfile">libpcprofile</filename></term>
884 <listitem>
885 <para>Contains profiling functions used to track the amount of CPU
886 time spent in specific source code lines</para>
887 <indexterm zone="ch-system-glibc libpcprofile">
888 <primary sortas="c-libpcprofile">libpcprofile</primary>
889 </indexterm>
890 </listitem>
891 </varlistentry>
892
893 <varlistentry id="libpthread">
894 <term><filename class="libraryfile">libpthread</filename></term>
895 <listitem>
896 <para>The POSIX threads library</para>
897 <indexterm zone="ch-system-glibc libpthread">
898 <primary sortas="c-libpthread">libpthread</primary>
899 </indexterm>
900 </listitem>
901 </varlistentry>
902
903 <varlistentry id="libresolv">
904 <term><filename class="libraryfile">libresolv</filename></term>
905 <listitem>
906 <para>Contains functions for creating, sending, and interpreting
907 packets to the Internet domain name servers</para>
908 <indexterm zone="ch-system-glibc libresolv">
909 <primary sortas="c-libresolv">libresolv</primary>
910 </indexterm>
911 </listitem>
912 </varlistentry>
913
914 <varlistentry id="librpcsvc">
915 <term><filename class="libraryfile">librpcsvc</filename></term>
916 <listitem>
917 <para>Contains functions providing miscellaneous RPC services</para>
918 <indexterm zone="ch-system-glibc librpcsvc">
919 <primary sortas="c-librpcsvc">librpcsvc</primary>
920 </indexterm>
921 </listitem>
922 </varlistentry>
923
924 <varlistentry id="librt">
925 <term><filename class="libraryfile">librt</filename></term>
926 <listitem>
927 <para>Contains functions providing most of the interfaces specified
928 by the POSIX.1b Realtime Extension</para>
929 <indexterm zone="ch-system-glibc librt">
930 <primary sortas="c-librt">librt</primary>
931 </indexterm>
932 </listitem>
933 </varlistentry>
934
935 <varlistentry id="libthread_db">
936 <term><filename class="libraryfile">libthread_db</filename></term>
937 <listitem>
938 <para>Contains functions useful for building debuggers for
939 multi-threaded programs</para>
940 <indexterm zone="ch-system-glibc libthread_db">
941 <primary sortas="c-libthread_db">libthread_db</primary>
942 </indexterm>
943 </listitem>
944 </varlistentry>
945
946 <varlistentry id="libutil">
947 <term><filename class="libraryfile">libutil</filename></term>
948 <listitem>
949 <para>Contains code for <quote>standard</quote> functions used in
950 many different Unix utilities</para>
951 <indexterm zone="ch-system-glibc libutil">
952 <primary sortas="c-libutil">libutil</primary>
953 </indexterm>
954 </listitem>
955 </varlistentry>
956
957 </variablelist>
958
959 </sect2>
960
961</sect1>
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