source: chapter06/glibc.xml@ cde2ae7

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Last change on this file since cde2ae7 was cde2ae7, checked in by Bruce Dubbs <bdubbs@…>, 10 years ago

Set SED variable in gcc, not glibc

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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 systemv; do
278 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
279 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
280 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
281done
282
283cp -v zone.tab iso3166.tab $ZONEINFO
284zic -d $ZONEINFO -p America/New_York
285unset ZONEINFO</userinput></screen>
286
287 <variablelist>
288 <title>The meaning of the zic commands:</title>
289
290 <varlistentry>
291 <term><parameter>zic -L /dev/null ...</parameter></term>
292 <listitem>
293 <para>This creates posix timezones, without any leap seconds. It is
294 conventional to put these in both
295 <filename class="directory">zoneinfo</filename> and
296 <filename class="directory">zoneinfo/posix</filename>. It is
297 necessary to put the POSIX timezones in
298 <filename class="directory">zoneinfo</filename>, otherwise various
299 test-suites will report errors. On an embedded system, where space is
300 tight and you do not intend to ever update the timezones, you could save
301 1.9MB by not using the <filename class="directory">posix</filename>
302 directory, but some applications or test-suites might give less good
303 results</para>
304 </listitem>
305 </varlistentry>
306 <varlistentry>
307 <term><parameter>zic -L leapseconds ...</parameter></term>
308 <listitem>
309 <para>This creates right timezones, including leap seconds. On an
310 embedded system, where space is tight and you do not intend to
311 ever update the timezones, or care about the correct time, you could
312 save 1.9MB by omitting the <filename class="directory">right</filename>
313 directory.</para>
314 </listitem>
315 </varlistentry>
316 <varlistentry>
317 <term><parameter>zic ... -p ...</parameter></term>
318 <listitem>
319 <para>This creates the <filename>posixrules</filename> file. We use
320 New York because POSIX requires the daylight savings time rules
321 to be in accordance with US rules.</para>
322 </listitem>
323 </varlistentry>
324 </variablelist>
325
326
327 <para>One way to determine the local time zone is to run the following
328 script:</para>
329
330<screen role="nodump"><userinput>tzselect</userinput></screen>
331
332 <para>After answering a few questions about the location, the script will
333 output the name of the time zone (e.g.,
334 <emphasis>America/Edmonton</emphasis>). There are also some other possible
335 timezones listed in <filename
336 class='directory'>/usr/share/zoneinfo</filename> such as
337 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
338 are not identified by the script but can be used.</para>
339
340 <para>Then create the <filename>/etc/localtime</filename> file by
341 running:</para>
342
343<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
344 /etc/localtime</userinput></screen>
345
346 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
347 time zone selected (e.g., Canada/Eastern).</para>
348
349 <variablelist>
350 <title>The meaning of the cp option:</title>
351
352 <varlistentry>
353 <term><parameter>--remove-destination</parameter></term>
354 <listitem>
355 <para>This is needed to force removal of the already existing symbolic
356 link. The reason for copying the file instead of using a symlink is to
357 cover the situation where <filename class="directory">/usr</filename>
358 is on a separate partition. This could be important when booted into
359 single user mode.</para>
360 </listitem>
361 </varlistentry>
362
363 </variablelist>
364
365 </sect2>
366
367 <sect2 id="conf-ld" role="configuration">
368 <title>Configuring the Dynamic Loader</title>
369
370 <indexterm zone="conf-ld">
371 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
372 </indexterm>
373
374 <para>By default, the dynamic loader (<filename
375 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
376 <filename class="directory">/lib</filename> and <filename
377 class="directory">/usr/lib</filename> for dynamic libraries that are
378 needed by programs as they are run. However, if there are libraries in
379 directories other than <filename class="directory">/lib</filename> and
380 <filename class="directory">/usr/lib</filename>, these need to be added
381 to the <filename>/etc/ld.so.conf</filename> file in order for the
382 dynamic loader to find them. Two directories that are commonly known
383 to contain additional libraries are <filename
384 class="directory">/usr/local/lib</filename> and <filename
385 class="directory">/opt/lib</filename>, so add those directories to the
386 dynamic loader's search path.</para>
387
388 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
389 following:</para>
390
391<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
392<literal># Begin /etc/ld.so.conf
393/usr/local/lib
394/opt/lib
395</literal>
396EOF</userinput></screen>
397
398 <para>If desired, the dynamic loader can also search a directory and
399 include the contents of files found there. Generally the files in
400 this include directory are one line specifying the desired library path.
401 To add this capability run the following commands:</para>
402
403<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
404<literal># Add an include directory
405include /etc/ld.so.conf.d/*.conf
406</literal>
407EOF
408mkdir -pv /etc/ld.so.conf.d</userinput></screen>
409
410 </sect2>
411
412 <sect2 id="contents-glibc" role="content">
413 <title>Contents of Glibc</title>
414
415 <segmentedlist>
416 <segtitle>Installed programs</segtitle>
417 <segtitle>Installed libraries</segtitle>
418 <segtitle>Installed directories</segtitle>
419
420 <seglistitem>
421 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
422 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
423 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
424 zdump, and zic</seg>
425 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
426 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
427 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
428 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
429 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
430 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
431 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
432 libthread_db.so, and libutil.{a,so}</seg>
433 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
434 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
435 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
436 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
437 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
438 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
439 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/glibc,
440 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo, /var/db</seg>
441 </seglistitem>
442 </segmentedlist>
443
444 <variablelist>
445 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
446 <?dbfo list-presentation="list"?>
447 <?dbhtml list-presentation="table"?>
448
449 <varlistentry id="catchsegv">
450 <term><command>catchsegv</command></term>
451 <listitem>
452 <para>Can be used to create a stack trace when a program
453 terminates with a segmentation fault</para>
454 <indexterm zone="ch-system-glibc catchsegv">
455 <primary sortas="b-catchsegv">catchsegv</primary>
456 </indexterm>
457 </listitem>
458 </varlistentry>
459
460 <varlistentry id="gencat">
461 <term><command>gencat</command></term>
462 <listitem>
463 <para>Generates message catalogues</para>
464 <indexterm zone="ch-system-glibc gencat">
465 <primary sortas="b-gencat">gencat</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="getconf">
471 <term><command>getconf</command></term>
472 <listitem>
473 <para>Displays the system configuration values for file system
474 specific variables</para>
475 <indexterm zone="ch-system-glibc getconf">
476 <primary sortas="b-getconf">getconf</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="getent">
482 <term><command>getent</command></term>
483 <listitem>
484 <para>Gets entries from an administrative database</para>
485 <indexterm zone="ch-system-glibc getent">
486 <primary sortas="b-getent">getent</primary>
487 </indexterm>
488 </listitem>
489 </varlistentry>
490
491 <varlistentry id="iconv">
492 <term><command>iconv</command></term>
493 <listitem>
494 <para>Performs character set conversion</para>
495 <indexterm zone="ch-system-glibc iconv">
496 <primary sortas="b-iconv">iconv</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="iconvconfig">
502 <term><command>iconvconfig</command></term>
503 <listitem>
504 <para>Creates fastloading <command>iconv</command> module configuration
505 files</para>
506 <indexterm zone="ch-system-glibc iconvconfig">
507 <primary sortas="b-iconvconfig">iconvconfig</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="ldconfig">
513 <term><command>ldconfig</command></term>
514 <listitem>
515 <para>Configures the dynamic linker runtime bindings</para>
516 <indexterm zone="ch-system-glibc ldconfig">
517 <primary sortas="b-ldconfig">ldconfig</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="ldd">
523 <term><command>ldd</command></term>
524 <listitem>
525 <para>Reports which shared libraries are required
526 by each given program or shared library</para>
527 <indexterm zone="ch-system-glibc ldd">
528 <primary sortas="b-ldd">ldd</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="lddlibc4">
534 <term><command>lddlibc4</command></term>
535 <listitem>
536 <para>Assists <command>ldd</command> with object files</para>
537 <indexterm zone="ch-system-glibc lddlibc4">
538 <primary sortas="b-lddlibc4">lddlibc4</primary>
539 </indexterm>
540 </listitem>
541 </varlistentry>
542
543 <varlistentry id="locale">
544 <term><command>locale</command></term>
545 <listitem>
546 <para>Prints various information about the current locale</para>
547 <indexterm zone="ch-system-glibc locale">
548 <primary sortas="b-locale">locale</primary>
549 </indexterm>
550 </listitem>
551 </varlistentry>
552
553 <varlistentry id="localedef">
554 <term><command>localedef</command></term>
555 <listitem>
556 <para>Compiles locale specifications</para>
557 <indexterm zone="ch-system-glibc localedef">
558 <primary sortas="b-localedef">localedef</primary>
559 </indexterm>
560 </listitem>
561 </varlistentry>
562
563 <varlistentry id="makedb">
564 <term><command>makedb</command></term>
565 <listitem>
566 <para>Creates a simple database from textual input</para>
567 <indexterm zone="ch-system-glibc makedb">
568 <primary sortas="b-makedb">makedb</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="mtrace">
574 <term><command>mtrace</command></term>
575 <listitem>
576 <para>Reads and interprets a memory trace file and displays a summary
577 in human-readable format</para>
578 <indexterm zone="ch-system-glibc mtrace">
579 <primary sortas="b-mtrace">mtrace</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="nscd">
585 <term><command>nscd</command></term>
586 <listitem>
587 <para>A daemon that provides a cache for the most common name
588 service requests</para>
589 <indexterm zone="ch-system-glibc nscd">
590 <primary sortas="b-nscd">nscd</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594
595 <varlistentry id="pcprofiledump">
596 <term><command>pcprofiledump</command></term>
597 <listitem>
598 <para>Dumps information generated by PC profiling</para>
599 <indexterm zone="ch-system-glibc pcprofiledump">
600 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604
605 <varlistentry id="pldd">
606 <term><command>pldd</command></term>
607 <listitem>
608 <para>Lists dynamic shared objects used by running processes</para>
609 <indexterm zone="ch-system-glibc pldd">
610 <primary sortas="b-pldd">pldd</primary>
611 </indexterm>
612 </listitem>
613 </varlistentry>
614<!--
615 <varlistentry id="pt_chown">
616 <term><command>pt_chown</command></term>
617 <listitem>
618 <para>A helper program for <command>grantpt</command> to set the owner,
619 group and access permissions of a slave pseudo terminal</para>
620 <indexterm zone="ch-system-glibc pt_chown">
621 <primary sortas="b-pt_chown">pt_chown</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625-->
626 <varlistentry id="rpcgen">
627 <term><command>rpcgen</command></term>
628 <listitem>
629 <para>Generates C code to implement the Remote Procedure Call (RPC)
630 protocol</para>
631 <indexterm zone="ch-system-glibc rpcgen">
632 <primary sortas="b-rpcgen">rpcgen</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="sln">
638 <term><command>sln</command></term>
639 <listitem>
640 <para>A statically linked <command>ln</command> program</para>
641 <indexterm zone="ch-system-glibc sln">
642 <primary sortas="b-sln">sln</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="sotruss">
648 <term><command>sotruss</command></term>
649 <listitem>
650 <para>Traces shared library procedure calls of a specified command</para>
651 <indexterm zone="ch-system-glibc sotruss">
652 <primary sortas="b-sotruss">sotruss</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry>
656
657 <varlistentry id="sprof">
658 <term><command>sprof</command></term>
659 <listitem>
660 <para>Reads and displays shared object profiling data</para>
661 <indexterm zone="ch-system-glibc sprof">
662 <primary sortas="b-sprof">sprof</primary>
663 </indexterm>
664 </listitem>
665 </varlistentry>
666
667 <varlistentry id="tzselect">
668 <term><command>tzselect</command></term>
669 <listitem>
670 <para>Asks the user about the location of the system and reports
671 the corresponding time zone description</para>
672 <indexterm zone="ch-system-glibc tzselect">
673 <primary sortas="b-tzselect">tzselect</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="xtrace">
679 <term><command>xtrace</command></term>
680 <listitem>
681 <para>Traces the execution of a program by printing the currently
682 executed function</para>
683 <indexterm zone="ch-system-glibc xtrace">
684 <primary sortas="b-xtrace">xtrace</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="zdump">
690 <term><command>zdump</command></term>
691 <listitem>
692 <para>The time zone dumper</para>
693 <indexterm zone="ch-system-glibc zdump">
694 <primary sortas="b-zdump">zdump</primary>
695 </indexterm>
696 </listitem>
697 </varlistentry>
698
699 <varlistentry id="zic">
700 <term><command>zic</command></term>
701 <listitem>
702 <para>The time zone compiler</para>
703 <indexterm zone="ch-system-glibc zic">
704 <primary sortas="b-zic">zic</primary>
705 </indexterm>
706 </listitem>
707 </varlistentry>
708
709 <varlistentry id="ld.so">
710 <term><filename class="libraryfile">ld.so</filename></term>
711 <listitem>
712 <para>The helper program for shared library executables</para>
713 <indexterm zone="ch-system-glibc ld.so">
714 <primary sortas="c-ld.so">ld.so</primary>
715 </indexterm>
716 </listitem>
717 </varlistentry>
718
719 <varlistentry id="libBrokenLocale">
720 <term><filename class="libraryfile">libBrokenLocale</filename></term>
721 <listitem>
722 <para>Used internally by Glibc as a gross hack to get broken programs
723 (e.g., some Motif applications) running. See comments in
724 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
725 for more information</para>
726 <indexterm zone="ch-system-glibc libBrokenLocale">
727 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
728 </indexterm>
729 </listitem>
730 </varlistentry>
731
732 <varlistentry id="libSegFault">
733 <term><filename class="libraryfile">libSegFault</filename></term>
734 <listitem>
735 <para>The segmentation fault signal handler, used by
736 <command>catchsegv</command></para>
737 <indexterm zone="ch-system-glibc libSegFault">
738 <primary sortas="c-libSegFault">libSegFault</primary>
739 </indexterm>
740 </listitem>
741 </varlistentry>
742
743 <varlistentry id="libanl">
744 <term><filename class="libraryfile">libanl</filename></term>
745 <listitem>
746 <para>An asynchronous name lookup library</para>
747 <indexterm zone="ch-system-glibc libanl">
748 <primary sortas="c-libanl">libanl</primary>
749 </indexterm>
750 </listitem>
751 </varlistentry>
752
753 <varlistentry id="libbsd-compat">
754 <term><filename class="libraryfile">libbsd-compat</filename></term>
755 <listitem>
756 <para>Provides the portability needed in order to run certain
757 Berkeley Software Distribution (BSD) programs under Linux</para>
758 <indexterm zone="ch-system-glibc libbsd-compat">
759 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
760 </indexterm>
761 </listitem>
762 </varlistentry>
763
764 <varlistentry id="libc">
765 <term><filename class="libraryfile">libc</filename></term>
766 <listitem>
767 <para>The main C library</para>
768 <indexterm zone="ch-system-glibc libc">
769 <primary sortas="c-libc">libc</primary>
770 </indexterm>
771 </listitem>
772 </varlistentry>
773
774 <varlistentry id="libcidn">
775 <term><filename class="libraryfile">libcidn</filename></term>
776 <listitem>
777 <para>Used internally by Glibc for handling internationalized domain
778 names in the <function>getaddrinfo()</function> function</para>
779 <indexterm zone="ch-system-glibc libcidn">
780 <primary sortas="c-libcidn">libcidn</primary>
781 </indexterm>
782 </listitem>
783 </varlistentry>
784
785 <varlistentry id="libcrypt">
786 <term><filename class="libraryfile">libcrypt</filename></term>
787 <listitem>
788 <para>The cryptography library</para>
789 <indexterm zone="ch-system-glibc libcrypt">
790 <primary sortas="c-libcrypt">libcrypt</primary>
791 </indexterm>
792 </listitem>
793 </varlistentry>
794
795 <varlistentry id="libdl">
796 <term><filename class="libraryfile">libdl</filename></term>
797 <listitem>
798 <para>The dynamic linking interface library</para>
799 <indexterm zone="ch-system-glibc libdl">
800 <primary sortas="c-libdl">libdl</primary>
801 </indexterm>
802 </listitem>
803 </varlistentry>
804
805 <varlistentry id="libg">
806 <term><filename class="libraryfile">libg</filename></term>
807 <listitem>
808 <para>Dummy library containing no functions. Previously was a runtime
809 library for <command>g++</command></para>
810 <indexterm zone="ch-system-glibc libg">
811 <primary sortas="c-libg">libg</primary>
812 </indexterm>
813 </listitem>
814 </varlistentry>
815
816 <varlistentry id="libieee">
817 <term><filename class="libraryfile">libieee</filename></term>
818 <listitem>
819 <para>Linking in this module forces error handling rules for math
820 functions as defined by the Institute of Electrical and Electronic
821 Engineers (IEEE). The default is POSIX.1 error handling</para>
822 <indexterm zone="ch-system-glibc libieee">
823 <primary sortas="c-libieee">libieee</primary>
824 </indexterm>
825 </listitem>
826 </varlistentry>
827
828 <varlistentry id="libm">
829 <term><filename class="libraryfile">libm</filename></term>
830 <listitem>
831 <para>The mathematical library</para>
832 <indexterm zone="ch-system-glibc libm">
833 <primary sortas="c-libm">libm</primary>
834 </indexterm>
835 </listitem>
836 </varlistentry>
837
838 <varlistentry id="libmcheck">
839 <term><filename class="libraryfile">libmcheck</filename></term>
840 <listitem>
841 <para>Turns on memory allocation checking when linked to</para>
842 <indexterm zone="ch-system-glibc libmcheck">
843 <primary sortas="c-libmcheck">libmcheck</primary>
844 </indexterm>
845 </listitem>
846 </varlistentry>
847
848 <varlistentry id="libmemusage">
849 <term><filename class="libraryfile">libmemusage</filename></term>
850 <listitem>
851 <para>Used by <command>memusage</command> to help collect
852 information about the memory usage of a program</para>
853 <indexterm zone="ch-system-glibc libmemusage">
854 <primary sortas="c-libmemusage">libmemusage</primary>
855 </indexterm>
856 </listitem>
857 </varlistentry>
858
859 <varlistentry id="libnsl">
860 <term><filename class="libraryfile">libnsl</filename></term>
861 <listitem>
862 <para>The network services library</para>
863 <indexterm zone="ch-system-glibc libnsl">
864 <primary sortas="c-libnsl">libnsl</primary>
865 </indexterm>
866 </listitem>
867 </varlistentry>
868
869 <varlistentry id="libnss">
870 <term><filename class="libraryfile">libnss</filename></term>
871 <listitem>
872 <para>The Name Service Switch libraries, containing functions for
873 resolving host names, user names, group names, aliases, services,
874 protocols, etc.</para>
875 <indexterm zone="ch-system-glibc libnss">
876 <primary sortas="c-libnss">libnss</primary>
877 </indexterm>
878 </listitem>
879 </varlistentry>
880
881 <varlistentry id="libpcprofile">
882 <term><filename class="libraryfile">libpcprofile</filename></term>
883 <listitem>
884 <para>Contains profiling functions used to track the amount of CPU
885 time spent in specific source code lines</para>
886 <indexterm zone="ch-system-glibc libpcprofile">
887 <primary sortas="c-libpcprofile">libpcprofile</primary>
888 </indexterm>
889 </listitem>
890 </varlistentry>
891
892 <varlistentry id="libpthread">
893 <term><filename class="libraryfile">libpthread</filename></term>
894 <listitem>
895 <para>The POSIX threads library</para>
896 <indexterm zone="ch-system-glibc libpthread">
897 <primary sortas="c-libpthread">libpthread</primary>
898 </indexterm>
899 </listitem>
900 </varlistentry>
901
902 <varlistentry id="libresolv">
903 <term><filename class="libraryfile">libresolv</filename></term>
904 <listitem>
905 <para>Contains functions for creating, sending, and interpreting
906 packets to the Internet domain name servers</para>
907 <indexterm zone="ch-system-glibc libresolv">
908 <primary sortas="c-libresolv">libresolv</primary>
909 </indexterm>
910 </listitem>
911 </varlistentry>
912
913 <varlistentry id="librpcsvc">
914 <term><filename class="libraryfile">librpcsvc</filename></term>
915 <listitem>
916 <para>Contains functions providing miscellaneous RPC services</para>
917 <indexterm zone="ch-system-glibc librpcsvc">
918 <primary sortas="c-librpcsvc">librpcsvc</primary>
919 </indexterm>
920 </listitem>
921 </varlistentry>
922
923 <varlistentry id="librt">
924 <term><filename class="libraryfile">librt</filename></term>
925 <listitem>
926 <para>Contains functions providing most of the interfaces specified
927 by the POSIX.1b Realtime Extension</para>
928 <indexterm zone="ch-system-glibc librt">
929 <primary sortas="c-librt">librt</primary>
930 </indexterm>
931 </listitem>
932 </varlistentry>
933
934 <varlistentry id="libthread_db">
935 <term><filename class="libraryfile">libthread_db</filename></term>
936 <listitem>
937 <para>Contains functions useful for building debuggers for
938 multi-threaded programs</para>
939 <indexterm zone="ch-system-glibc libthread_db">
940 <primary sortas="c-libthread_db">libthread_db</primary>
941 </indexterm>
942 </listitem>
943 </varlistentry>
944
945 <varlistentry id="libutil">
946 <term><filename class="libraryfile">libutil</filename></term>
947 <listitem>
948 <para>Contains code for <quote>standard</quote> functions used in
949 many different Unix utilities</para>
950 <indexterm zone="ch-system-glibc libutil">
951 <primary sortas="c-libutil">libutil</primary>
952 </indexterm>
953 </listitem>
954 </varlistentry>
955
956 </variablelist>
957
958 </sect2>
959
960</sect1>
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