source: chapter06/glibc.xml@ a713e43

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Last change on this file since a713e43 was a713e43, checked in by Bruce Dubbs <bdubbs@…>, 10 years ago

Update to glibc-2.19

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10460 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>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>The Glibc documentation recommends building Glibc outside of the source
69 directory in a dedicated build directory:</para>
70
71<screen><userinput remap="pre">mkdir -v ../glibc-build
72cd ../glibc-build</userinput></screen>
73
74 <para>Prepare Glibc for compilation:</para>
75
76<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
77 --prefix=/usr \
78 --disable-profile \
79 --enable-kernel=&min-kernel; \
80 --libexecdir=/usr/lib/glibc</userinput></screen>
81
82 <variablelist>
83 <title>The meaning of the new configure options:</title>
84
85 <varlistentry>
86 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
87 <listitem>
88 <para>This changes the location of some auxillary files from the
89 default of <filename class="directory">/usr/libexec</filename> to
90 <filename class="directory">/usr/lib/glibc</filename>.</para>
91 </listitem>
92 </varlistentry>
93
94 </variablelist>
95
96 <para>Compile the package:</para>
97
98<screen><userinput remap="make">make</userinput></screen>
99
100 <important>
101 <para>In this section, the test suite for Glibc is considered critical.
102 Do not skip it under any circumstance.</para>
103 </important>
104
105 <para>Generally a few tests do not pass, but you can generally ignore
106 any of the test failures listed below. Now test the build results:</para>
107
108<screen><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log
109grep Error glibc-check-log</userinput></screen>
110
111 <para>You will probably see an expected (ignored) failure in the
112 <emphasis>posix/annexc</emphasis> and
113 <emphasis>conform/run-conformtest</emphasis> tests. In addition the Glibc
114 test suite is somewhat dependent on the host system. This is a list of the
115 most common issues:</para>
116
117 <itemizedlist>
118
119 <listitem>
120 <para>The <emphasis>nptl/tst-clock2</emphasis>,
121 <emphasis>nptl/tst-attr3</emphasis>,
122 <emphasis>tst/tst-cputimer1</emphasis>, and
123 <emphasis>rt/tst-cpuclock2</emphasis>
124 tests have been known to fail. The
125 reason is not completely understood, but indications are that minor
126 timing issues can trigger these failures.</para>
127 </listitem>
128
129 <listitem>
130 <para>The math tests sometimes fail when running on
131 systems where the CPU is not a relatively new genuine Intel or
132 authentic AMD processor.</para>
133 </listitem>
134
135 <listitem>
136 <para>When running on older and slower hardware or on systems under
137 load, some tests can fail because of test timeouts being exceeded.
138 Modifying the make check command to set a TIMEOUTFACTOR is reported to
139 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
140 make -k check</command>).</para>
141 </listitem>
142
143 <listitem>
144 <para>posix/tst-getaddrinfo4 will always fail due to not having a network
145 connection when the test is run.</para>
146 </listitem>
147
148 <listitem>
149 <para>Other tests known to fail on some architectures are posix/bug-regex32,
150 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, and stdio-common/bug22.</para>
151 </listitem>
152
153 </itemizedlist>
154
155 <para>Though it is a harmless message, the install stage of Glibc will
156 complain about the absence of <filename>/etc/ld.so.conf</filename>.
157 Prevent this warning with:</para>
158
159<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
160
161 <para>Install the package:</para>
162
163<screen><userinput remap="install">make install</userinput></screen>
164
165 <para>Install NIS and RPC related headers that are not installed by
166 default; these are required to rebuild glibc and by several BLFS
167 packages:</para>
168
169<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/sunrpc/rpc/*.h /usr/include/rpc
170cp -v ../glibc-&glibc-version;/sunrpc/rpcsvc/*.h /usr/include/rpcsvc
171cp -v ../glibc-&glibc-version;/nis/rpcsvc/*.h /usr/include/rpcsvc</userinput></screen>
172
173 <para>The locales that can make the system respond in a different language
174 were not installed by the above command. None of the locales are required,
175 but if some of them are missing, test suites of the future packages would
176 skip important testcases.</para>
177
178 <para>Individual locales can be installed using the
179 <command>localedef</command> program. E.g., the first
180 <command>localedef</command> command below combines the
181 <filename>/usr/share/i18n/locales/cs_CZ</filename>
182 charset-independent locale definition with the
183 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
184 charmap definition and appends the result to the
185 <filename>/usr/lib/locale/locale-archive</filename> file.
186 The following instructions will install the minimum set of
187 locales necessary for the optimal coverage of tests:</para>
188
189<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
190localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
191localedef -i de_DE -f ISO-8859-1 de_DE
192localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
193localedef -i de_DE -f UTF-8 de_DE.UTF-8
194localedef -i en_GB -f UTF-8 en_GB.UTF-8
195localedef -i en_HK -f ISO-8859-1 en_HK
196localedef -i en_PH -f ISO-8859-1 en_PH
197localedef -i en_US -f ISO-8859-1 en_US
198localedef -i en_US -f UTF-8 en_US.UTF-8
199localedef -i es_MX -f ISO-8859-1 es_MX
200localedef -i fa_IR -f UTF-8 fa_IR
201localedef -i fr_FR -f ISO-8859-1 fr_FR
202localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
203localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
204localedef -i it_IT -f ISO-8859-1 it_IT
205localedef -i it_IT -f UTF-8 it_IT.UTF-8
206localedef -i ja_JP -f EUC-JP ja_JP
207localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
208localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
209localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
210localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
211
212 <para>In addition, install the locale for your own country, language and
213 character set.</para>
214
215 <para>Alternatively, install all locales listed in the
216 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
217 (it includes every locale listed above and many more) at once with the
218 following time-consuming command:</para>
219
220<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
221
222 <para>Then use the <command>localedef</command> command to create and
223 install locales not listed in the
224 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
225 in the unlikely case you need them.</para>
226
227 </sect2>
228
229 <sect2 id="conf-glibc" role="configuration">
230 <title>Configuring Glibc</title>
231
232 <indexterm zone="conf-glibc">
233 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
234 </indexterm>
235
236 <indexterm zone="conf-glibc">
237 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
238 </indexterm>
239
240 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
241 because, although Glibc provides defaults when this file is missing or corrupt,
242 the Glibc defaults do not work well in a networked environment. The time zone
243 also needs to be configured.</para>
244
245 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
246 following:</para>
247
248<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
249<literal># Begin /etc/nsswitch.conf
250
251passwd: files
252group: files
253shadow: files
254
255hosts: files dns
256networks: files
257
258protocols: files
259services: files
260ethers: files
261rpc: files
262
263# End /etc/nsswitch.conf</literal>
264EOF</userinput></screen>
265
266 <para>Install timezone data:</para>
267<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
268
269ZONEINFO=/usr/share/zoneinfo
270mkdir -pv $ZONEINFO/{posix,right}
271
272for tz in etcetera southamerica northamerica europe africa antarctica \
273 asia australasia backward pacificnew systemv; do
274 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
275 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
276 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
277done
278
279cp -v zone.tab iso3166.tab $ZONEINFO
280zic -d $ZONEINFO -p America/New_York
281unset ZONEINFO</userinput></screen>
282
283 <variablelist>
284 <title>The meaning of the zic commands:</title>
285
286 <varlistentry>
287 <term><parameter>zic -L /dev/null ...</parameter></term>
288 <listitem>
289 <para>This creates posix timezones, without any leap seconds. It is
290 conventional to put these in both
291 <filename class="directory">zoneinfo</filename> and
292 <filename class="directory">zoneinfo/posix</filename>. It is
293 necessary to put the POSIX timezones in
294 <filename class="directory">zoneinfo</filename>, otherwise various
295 test-suites will report errors. On an embedded system, where space is
296 tight and you do not intend to ever update the timezones, you could save
297 1.9MB by not using the <filename class="directory">posix</filename>
298 directory, but some applications or test-suites might give less good
299 results</para>
300 </listitem>
301 </varlistentry>
302 <varlistentry>
303 <term><parameter>zic -L leapseconds ...</parameter></term>
304 <listitem>
305 <para>This creates right timezones, including leap seconds. On an
306 embedded system, where space is tight and you do not intend to
307 ever update the timezones, or care about the correct time, you could
308 save 1.9MB by omitting the <filename class="directory">right</filename>
309 directory.</para>
310 </listitem>
311 </varlistentry>
312 <varlistentry>
313 <term><parameter>zic ... -p ...</parameter></term>
314 <listitem>
315 <para>This creates the <filename>posixrules</filename> file. We use
316 New York because POSIX requires the daylight savings time rules
317 to be in accordance with US rules.</para>
318 </listitem>
319 </varlistentry>
320 </variablelist>
321
322
323 <para>One way to determine the local time zone is to run the following
324 script:</para>
325
326<screen role="nodump"><userinput>tzselect</userinput></screen>
327
328 <para>After answering a few questions about the location, the script will
329 output the name of the time zone (e.g.,
330 <emphasis>America/Edmonton</emphasis>). There are also some other possible
331 timezones listed in <filename
332 class='directory'>/usr/share/zoneinfo</filename> such as
333 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
334 are not identified by the script but can be used.</para>
335
336 <para>Then create the <filename>/etc/localtime</filename> file by
337 running:</para>
338
339<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
340 /etc/localtime</userinput></screen>
341
342 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
343 time zone selected (e.g., Canada/Eastern).</para>
344
345 <variablelist>
346 <title>The meaning of the cp option:</title>
347
348 <varlistentry>
349 <term><parameter>--remove-destination</parameter></term>
350 <listitem>
351 <para>This is needed to force removal of the already existing symbolic
352 link. The reason for copying the file instead of using a symlink is to
353 cover the situation where <filename class="directory">/usr</filename>
354 is on a separate partition. This could be important when booted into
355 single user mode.</para>
356 </listitem>
357 </varlistentry>
358
359 </variablelist>
360
361 </sect2>
362
363 <sect2 id="conf-ld" role="configuration">
364 <title>Configuring the Dynamic Loader</title>
365
366 <indexterm zone="conf-ld">
367 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
368 </indexterm>
369
370 <para>By default, the dynamic loader (<filename
371 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
372 <filename class="directory">/lib</filename> and <filename
373 class="directory">/usr/lib</filename> for dynamic libraries that are
374 needed by programs as they are run. However, if there are libraries in
375 directories other than <filename class="directory">/lib</filename> and
376 <filename class="directory">/usr/lib</filename>, these need to be added
377 to the <filename>/etc/ld.so.conf</filename> file in order for the
378 dynamic loader to find them. Two directories that are commonly known
379 to contain additional libraries are <filename
380 class="directory">/usr/local/lib</filename> and <filename
381 class="directory">/opt/lib</filename>, so add those directories to the
382 dynamic loader's search path.</para>
383
384 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
385 following:</para>
386
387<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
388<literal># Begin /etc/ld.so.conf
389/usr/local/lib
390/opt/lib
391</literal>
392EOF</userinput></screen>
393
394 <para>If desired, the dynamic loader can also search a directory and
395 include the contents of files found there. Generally the files in
396 this include directory are one line specifying the desired library path.
397 To add this capability run the following commands:</para>
398
399<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
400<literal># Add an include directory
401include /etc/ld.so.conf.d/*.conf
402</literal>
403EOF
404mkdir -pv /etc/ld.so.conf.d</userinput></screen>
405
406 </sect2>
407
408 <sect2 id="contents-glibc" role="content">
409 <title>Contents of Glibc</title>
410
411 <segmentedlist>
412 <segtitle>Installed programs</segtitle>
413 <segtitle>Installed libraries</segtitle>
414 <segtitle>Installed directories</segtitle>
415
416 <seglistitem>
417 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
418 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
419 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
420 zdump, and zic</seg>
421 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
422 libc.{a,so}, libc_nonshared.a, libcidn.so,
423 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
424 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
425 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
426 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
427 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
428 libthread_db.so, and libutil.{a,so}</seg>
429 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
430 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
431 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
432 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
433 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
434 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
435 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/glibc,
436 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo, /var/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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