source: chapter06/glibc.xml@ 2594b0a

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Last change on this file since 2594b0a was 2594b0a, checked in by Bryan Kadzban <bryan@…>, 15 years ago

Add a sed to glibc to fix the constants passed to futex(2) in 32-bit builds. Seems to fix testsuite hangs (the tst-mutex9 process never exits, for instance).

This change is in upstream git, so this can be reverted once we upgrade glibc.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8944 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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File size: 33.9 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-system-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Glibc package contains the main C library. This library provides
27 the basic routines for allocating memory, searching directories, opening and
28 closing files, reading and writing files, string handling, pattern matching,
29 arithmetic, and so on.</para>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-ch6-sbu;</seg>
37 <seg>&glibc-ch6-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <note>
47 <para>Some packages outside of LFS suggest installing GNU libiconv in
48 order to translate data from one encoding to another. The project's
49 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
50 <quote>This library provides an <function>iconv()</function>
51 implementation, for use on systems which don't have one, or whose
52 implementation cannot convert from/to Unicode.</quote> Glibc provides
53 an <function>iconv()</function> implementation and can convert from/to
54 Unicode, therefore libiconv is not required on an LFS system.</para>
55 </note>
56
57 <para>The Glibc build system is self-contained and will install
58 perfectly, even though the compiler specs file and linker are still
59 pointing at <filename class="directory">/tools</filename>. The specs
60 and linker cannot be adjusted before the Glibc install because the
61 Glibc autoconf tests would give false results and defeat the goal
62 of achieving a clean build.</para>
63
64 <para>The glibc-libidn tarball adds support for internationalized domain
65 names (IDN) to Glibc. Many programs that support IDN require the full
66 <filename class="libraryfile">libidn</filename> library, not this add-on (see
67 <ulink url="&blfs-root;view/svn/general/libidn.html"/>).
68 Unpack the tarball from within the Glibc source directory:</para>
69
70<screen><userinput remap="pre">tar -xvf ../glibc-libidn-&glibc-version;.tar.bz2
71mv glibc-libidn-&glibc-version; libidn</userinput></screen>
72
73<!--
74 This should have been fixed a long time ago.
75
76 <para>In the vi_VN.TCVN locale, <command>bash</command> enters an infinite
77 loop at startup. It is unknown whether this is a <command>bash</command>
78 bug or a Glibc problem. Disable installation of this locale in order to
79 avoid the problem:</para>
80
81<screen><userinput remap="pre">sed -i '/vi_VN.TCVN/d' localedata/SUPPORTED</userinput></screen>
82-->
83
84 <para>When running <command>make install</command>, a script called
85 <filename>test-installation.pl</filename> performs a small sanity test on
86 our newly installed Glibc. However, because our toolchain still points to
87 the <filename class="directory">/tools</filename> directory, the sanity
88 test would be carried out against the wrong Glibc. We can force the script
89 to check the Glibc we have just installed with the following:</para>
90
91<screen><userinput remap="pre">DL=$(readelf -l /bin/sh | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
92sed -i &quot;s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=$DL -o|&quot; \
93 scripts/test-installation.pl
94unset DL</userinput></screen>
95
96 <para>The <command>ldd</command> shell script contains Bash-specific
97 syntax. Change its default program interpreter to <command>/bin/bash</command>
98 in case another <command>/bin/sh</command> is installed as described in the
99 <ulink url="&blfs-root;view/svn/postlfs/shells.html">Shells</ulink>
100 chapter of the BLFS book:</para>
101
102<screen><userinput remap="pre">sed -i 's|@BASH@|/bin/bash|' elf/ldd.bash.in</userinput></screen>
103
104 <para>Fix an error in one of the make check routines. Note that the escaped
105 newline in the second <command>sed</command> is required:</para>
106
107<screen><userinput remap="pre">sed -i s/utf8/UTF-8/ libio/tst-fgetwc.c
108sed -i '/tst-fgetws-ENV/ a\
109tst-fgetwc-ENV = LOCPATH=$(common-objpfx)localedata' libio/Makefile</userinput></screen>
110
111 <!-- This sed can be removed for any glibc newer than 2.10.1 (along with the
112 matching sed in chapter 5). See glibc bug 10262. -->
113 <para>Fix an error in the constants that get passed to the futex system
114 call in some cases, causing certain pthread_mutex operations to fail:</para>
115
116<screen><userinput remap="pre">sed -i -e 's/FUTEX_WAIT\( | FUTEX_CLOCK_REALTIME, reg\)/FUTEX_WAIT_BITSET\1/' \
117 nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S</userinput></screen>
118
119 <para>The Glibc documentation recommends building Glibc outside of the source
120 directory in a dedicated build directory:</para>
121
122<screen><userinput remap="pre">mkdir -v ../glibc-build
123cd ../glibc-build</userinput></screen>
124
125 <para>As in Chapter 5, add the needed compiler flags to CFLAGS for x86 machines.
126 Here, the optimization of the library is also set for the gcc compiler to
127 enhance compilation speed (-pipe) and package performance (-O3).</para>
128
129<screen><userinput remap="configure">case `uname -m` in
130 i?86) echo "CFLAGS += -march=i486 -mtune=native -O3 -pipe" &gt; configparms ;;
131esac</userinput></screen>
132
133 <para>Prepare Glibc for compilation:</para>
134
135<screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/usr \
136 --disable-profile --enable-add-ons \
137 --enable-kernel=2.6.18 --libexecdir=/usr/lib/glibc</userinput></screen>
138
139 <variablelist>
140 <title>The meaning of the new configure options:</title>
141
142 <varlistentry>
143 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
144 <listitem>
145 <para>This changes the location of the <command>pt_chown</command>
146 program from its default of <filename
147 class="directory">/usr/libexec</filename> to <filename
148 class="directory">/usr/lib/glibc</filename>.</para>
149 </listitem>
150 </varlistentry>
151
152 </variablelist>
153
154 <para>Compile the package:</para>
155
156<screen><userinput remap="make">make</userinput></screen>
157
158 <important>
159 <para>In this section, the test suite for Glibc is considered critical.
160 Do not skip it under any circumstance.</para>
161 </important>
162
163 <para>Before running the tests, copy a file from the source tree into our
164 build tree to prevent a couple of test failures, then test the
165 results:</para>
166
167<screen><userinput remap="test">cp -v ../glibc-&glibc-version;/iconvdata/gconv-modules iconvdata
168make -k check 2&gt;&amp;1 | tee glibc-check-log
169grep Error glibc-check-log</userinput></screen>
170
171 <para>You will probably see an expected (ignored) failure in the
172 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
173 is somewhat dependent on the host system. This is a list of the most
174 common issues:</para>
175
176 <itemizedlist>
177 <!-- Check again after updating from gcc-4.1.x -->
178 <listitem>
179 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
180 using the 4.1 series of GCC.</para>
181 </listitem>
182 <!-- Was true in glibc-2.3.6 -->
183 <listitem>
184 <para>The <emphasis>nptl/tst-clock2</emphasis> and
185 <emphasis>tst-attr3</emphasis> tests sometimes
186 fail. The reason is not completely understood, but indications
187 are that a heavy system load can trigger these failures.</para>
188 </listitem>
189 <listitem>
190 <para>The math tests sometimes fail when running on
191 systems where the CPU is not a relatively new genuine Intel or
192 authentic AMD processor.</para>
193 </listitem>
194 <listitem>
195 <para>If you have mounted the LFS partition with the
196 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
197 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
198 use the <parameter>noatime</parameter> option while building LFS.</para>
199 </listitem>
200 <listitem>
201 <para>When running on older and slower hardware or on systems under
202 load, some tests can fail because of test timeouts being exceeded.</para>
203 </listitem>
204 </itemizedlist>
205
206 <para>Though it is a harmless message, the install stage of Glibc will
207 complain about the absence of <filename>/etc/ld.so.conf</filename>.
208 Prevent this warning with:</para>
209
210<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
211
212 <para>Install the package:</para>
213
214<screen><userinput remap="install">make install</userinput></screen>
215
216 <para>The locales that can make the system respond in a different language
217 were not installed by the above command. None of the locales are required,
218 but if some of them are missing, testsuites of the future packages would
219 skip important testcases.</para>
220
221 <para>Individual locales can be installed using the
222 <command>localedef</command> program. E.g., the first
223 <command>localedef</command> command below combines the
224 <filename>/usr/share/i18n/locales/cs_CZ</filename>
225 charset-independent locale definition with the
226 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
227 charmap definition and appends the result to the
228 <filename>/usr/lib/locale/locale-archive</filename> file.
229 The following instructions will install the minimum set of
230 locales necessary for the optimal coverage of tests:</para>
231
232<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
233localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
234localedef -i de_DE -f ISO-8859-1 de_DE
235localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
236localedef -i de_DE -f UTF-8 de_DE.UTF-8
237localedef -i en_HK -f ISO-8859-1 en_HK
238localedef -i en_PH -f ISO-8859-1 en_PH
239localedef -i en_US -f ISO-8859-1 en_US
240localedef -i en_US -f UTF-8 en_US.UTF-8
241localedef -i es_MX -f ISO-8859-1 es_MX
242localedef -i fa_IR -f UTF-8 fa_IR
243localedef -i fr_FR -f ISO-8859-1 fr_FR
244localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
245localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
246localedef -i it_IT -f ISO-8859-1 it_IT
247localedef -i ja_JP -f EUC-JP ja_JP
248localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
249localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
250
251 <para>In addition, install the locale for your own country, language and
252 character set.</para>
253
254 <para>Alternatively, install all locales listed in the
255 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
256 (it includes every locale listed above and many more) at once with the
257 following time-consuming command:</para>
258
259<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
260
261 <para>Then use the <command>localedef</command> command to create and
262 install locales not listed in the
263 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
264 in the unlikely case you need them.</para>
265 <!-- The Live CD patches the localedata/SUPPORTED file instead of
266 running localedef, the results are equivalent -->
267
268 </sect2>
269
270 <sect2 id="conf-glibc" role="configuration">
271 <title>Configuring Glibc</title>
272
273 <indexterm zone="conf-glibc">
274 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
275 </indexterm>
276
277 <indexterm zone="conf-glibc">
278 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
279 </indexterm>
280
281 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
282 because, although Glibc provides defaults when this file is missing or corrupt,
283 the Glibc defaults do not work well in a networked environment. The time zone
284 also needs to be configured.</para>
285
286 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
287 following:</para>
288
289<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
290<literal># Begin /etc/nsswitch.conf
291
292passwd: files
293group: files
294shadow: files
295
296hosts: files dns
297networks: files
298
299protocols: files
300services: files
301ethers: files
302rpc: files
303
304# End /etc/nsswitch.conf</literal>
305EOF</userinput></screen>
306
307 <para>One way to determine the local time zone, run the following
308 script:</para>
309
310<screen role="nodump"><userinput>tzselect</userinput></screen>
311
312 <para>After answering a few questions about the location, the script will
313 output the name of the time zone (e.g.,
314 <emphasis>America/Edmonton</emphasis>). There are also some other possible
315 timezones listed in <filename
316 class='directory'>/usr/share/zoneinfo</filename> such as
317 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
318 are not identified by the script but can be used.</para>
319
320 <para>Then create the <filename>/etc/localtime</filename> file by
321 running:</para>
322
323<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
324 /etc/localtime</userinput></screen>
325
326 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
327 time zone selected (e.g., Canada/Eastern).</para>
328
329 <variablelist>
330 <title>The meaning of the cp option:</title>
331
332 <varlistentry>
333 <term><parameter>--remove-destination</parameter></term>
334 <listitem>
335 <para>This is needed to force removal of the already existing symbolic
336 link. The reason for copying the file instead of using a symlink is to
337 cover the situation where <filename class="directory">/usr</filename>
338 is on a separate partition. This could be important when booted into
339 single user mode.</para>
340 </listitem>
341 </varlistentry>
342
343 </variablelist>
344
345 </sect2>
346
347 <sect2 id="conf-ld" role="configuration">
348 <title>Configuring the Dynamic Loader</title>
349
350 <indexterm zone="conf-ld">
351 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
352 </indexterm>
353
354 <para>By default, the dynamic loader (<filename
355 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
356 <filename class="directory">/lib</filename> and <filename
357 class="directory">/usr/lib</filename> for dynamic libraries that are
358 needed by programs as they are run. However, if there are libraries in
359 directories other than <filename class="directory">/lib</filename> and
360 <filename class="directory">/usr/lib</filename>, these need to be added
361 to the <filename>/etc/ld.so.conf</filename> file in order for the
362 dynamic loader to find them. Two directories that are commonly known
363 to contain additional libraries are <filename
364 class="directory">/usr/local/lib</filename> and <filename
365 class="directory">/opt/lib</filename>, so add those directories to the
366 dynamic loader's search path.</para>
367
368 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
369 following:</para>
370
371<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
372<literal># Begin /etc/ld.so.conf
373
374/usr/local/lib
375/opt/lib
376
377# End /etc/ld.so.conf</literal>
378EOF</userinput></screen>
379
380 </sect2>
381
382 <sect2 id="contents-glibc" role="content">
383 <title>Contents of Glibc</title>
384
385 <segmentedlist>
386 <segtitle>Installed programs</segtitle>
387 <segtitle>Installed libraries</segtitle>
388
389 <seglistitem>
390 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
391 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
392 pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
393 zdump, and zic</seg>
394 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
395 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
396 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
397 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
398 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
399 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
400 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
401 libthread_db.so, and libutil.{a,so}</seg>
402 </seglistitem>
403 </segmentedlist>
404
405 <variablelist>
406 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
407 <?dbfo list-presentation="list"?>
408 <?dbhtml list-presentation="table"?>
409
410 <varlistentry id="catchsegv">
411 <term><command>catchsegv</command></term>
412 <listitem>
413 <para>Can be used to create a stack trace when a program
414 terminates with a segmentation fault</para>
415 <indexterm zone="ch-system-glibc catchsegv">
416 <primary sortas="b-catchsegv">catchsegv</primary>
417 </indexterm>
418 </listitem>
419 </varlistentry>
420
421 <varlistentry id="gencat">
422 <term><command>gencat</command></term>
423 <listitem>
424 <para>Generates message catalogues</para>
425 <indexterm zone="ch-system-glibc gencat">
426 <primary sortas="b-gencat">gencat</primary>
427 </indexterm>
428 </listitem>
429 </varlistentry>
430
431 <varlistentry id="getconf">
432 <term><command>getconf</command></term>
433 <listitem>
434 <para>Displays the system configuration values for file system
435 specific variables</para>
436 <indexterm zone="ch-system-glibc getconf">
437 <primary sortas="b-getconf">getconf</primary>
438 </indexterm>
439 </listitem>
440 </varlistentry>
441
442 <varlistentry id="getent">
443 <term><command>getent</command></term>
444 <listitem>
445 <para>Gets entries from an administrative database</para>
446 <indexterm zone="ch-system-glibc getent">
447 <primary sortas="b-getent">getent</primary>
448 </indexterm>
449 </listitem>
450 </varlistentry>
451
452 <varlistentry id="iconv">
453 <term><command>iconv</command></term>
454 <listitem>
455 <para>Performs character set conversion</para>
456 <indexterm zone="ch-system-glibc iconv">
457 <primary sortas="b-iconv">iconv</primary>
458 </indexterm>
459 </listitem>
460 </varlistentry>
461
462 <varlistentry id="iconvconfig">
463 <term><command>iconvconfig</command></term>
464 <listitem>
465 <para>Creates fastloading <command>iconv</command> module configuration
466 files</para>
467 <indexterm zone="ch-system-glibc iconvconfig">
468 <primary sortas="b-iconvconfig">iconvconfig</primary>
469 </indexterm>
470 </listitem>
471 </varlistentry>
472
473 <varlistentry id="ldconfig">
474 <term><command>ldconfig</command></term>
475 <listitem>
476 <para>Configures the dynamic linker runtime bindings</para>
477 <indexterm zone="ch-system-glibc ldconfig">
478 <primary sortas="b-ldconfig">ldconfig</primary>
479 </indexterm>
480 </listitem>
481 </varlistentry>
482
483 <varlistentry id="ldd">
484 <term><command>ldd</command></term>
485 <listitem>
486 <para>Reports which shared libraries are required
487 by each given program or shared library</para>
488 <indexterm zone="ch-system-glibc ldd">
489 <primary sortas="b-ldd">ldd</primary>
490 </indexterm>
491 </listitem>
492 </varlistentry>
493
494 <varlistentry id="lddlibc4">
495 <term><command>lddlibc4</command></term>
496 <listitem>
497 <para>Assists <command>ldd</command> with object files</para>
498 <indexterm zone="ch-system-glibc lddlibc4">
499 <primary sortas="b-lddlibc4">lddlibc4</primary>
500 </indexterm>
501 </listitem>
502 </varlistentry>
503
504 <varlistentry id="locale">
505 <term><command>locale</command></term>
506 <listitem>
507 <para>Prints various information about the current locale</para>
508 <indexterm zone="ch-system-glibc locale">
509 <primary sortas="b-locale">locale</primary>
510 </indexterm>
511 </listitem>
512 </varlistentry>
513
514 <varlistentry id="localedef">
515 <term><command>localedef</command></term>
516 <listitem>
517 <para>Compiles locale specifications</para>
518 <indexterm zone="ch-system-glibc localedef">
519 <primary sortas="b-localedef">localedef</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="mtrace">
525 <term><command>mtrace</command></term>
526 <listitem>
527 <para>Reads and interprets a memory trace file and displays a summary
528 in human-readable format</para>
529 <indexterm zone="ch-system-glibc mtrace">
530 <primary sortas="b-mtrace">mtrace</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="nscd">
536 <term><command>nscd</command></term>
537 <listitem>
538 <para>A daemon that provides a cache for the most common name
539 service requests</para>
540 <indexterm zone="ch-system-glibc nscd">
541 <primary sortas="b-nscd">nscd</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="pcprofiledump">
547 <term><command>pcprofiledump</command></term>
548 <listitem>
549 <para>Dumps information generated by PC profiling</para>
550 <indexterm zone="ch-system-glibc pcprofiledump">
551 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
552 </indexterm>
553 </listitem>
554 </varlistentry>
555
556 <varlistentry id="pt_chown">
557 <term><command>pt_chown</command></term>
558 <listitem>
559 <para>A helper program for <command>grantpt</command> to set the owner,
560 group and access permissions of a slave pseudo terminal</para>
561 <indexterm zone="ch-system-glibc pt_chown">
562 <primary sortas="b-pt_chown">pt_chown</primary>
563 </indexterm>
564 </listitem>
565 </varlistentry>
566
567 <varlistentry id="rpcgen">
568 <term><command>rpcgen</command></term>
569 <listitem>
570 <para>Generates C code to implement the Remote Procedure Call (RPC)
571 protocol</para>
572 <indexterm zone="ch-system-glibc rpcgen">
573 <primary sortas="b-rpcgen">rpcgen</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="rpcinfo">
579 <term><command>rpcinfo</command></term>
580 <listitem>
581 <para>Makes an RPC call to an RPC server</para>
582 <indexterm zone="ch-system-glibc rpcinfo">
583 <primary sortas="b-rpcinfo">rpcinfo</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="sln">
589 <term><command>sln</command></term>
590 <listitem>
591 <para>A statically linked <command>ln</command> program</para>
592 <indexterm zone="ch-system-glibc sln">
593 <primary sortas="b-sln">sln</primary>
594 </indexterm>
595 </listitem>
596 </varlistentry>
597
598 <varlistentry id="sprof">
599 <term><command>sprof</command></term>
600 <listitem>
601 <para>Reads and displays shared object profiling data</para>
602 <indexterm zone="ch-system-glibc sprof">
603 <primary sortas="b-sprof">sprof</primary>
604 </indexterm>
605 </listitem>
606 </varlistentry>
607
608 <varlistentry id="tzselect">
609 <term><command>tzselect</command></term>
610 <listitem>
611 <para>Asks the user about the location of the system and reports
612 the corresponding time zone description</para>
613 <indexterm zone="ch-system-glibc tzselect">
614 <primary sortas="b-tzselect">tzselect</primary>
615 </indexterm>
616 </listitem>
617 </varlistentry>
618
619 <varlistentry id="xtrace">
620 <term><command>xtrace</command></term>
621 <listitem>
622 <para>Traces the execution of a program by printing the currently
623 executed function</para>
624 <indexterm zone="ch-system-glibc xtrace">
625 <primary sortas="b-xtrace">xtrace</primary>
626 </indexterm>
627 </listitem>
628 </varlistentry>
629
630 <varlistentry id="zdump">
631 <term><command>zdump</command></term>
632 <listitem>
633 <para>The time zone dumper</para>
634 <indexterm zone="ch-system-glibc zdump">
635 <primary sortas="b-zdump">zdump</primary>
636 </indexterm>
637 </listitem>
638 </varlistentry>
639
640 <varlistentry id="zic">
641 <term><command>zic</command></term>
642 <listitem>
643 <para>The time zone compiler</para>
644 <indexterm zone="ch-system-glibc zic">
645 <primary sortas="b-zic">zic</primary>
646 </indexterm>
647 </listitem>
648 </varlistentry>
649
650 <varlistentry id="ld.so">
651 <term><filename class="libraryfile">ld.so</filename></term>
652 <listitem>
653 <para>The helper program for shared library executables</para>
654 <indexterm zone="ch-system-glibc ld.so">
655 <primary sortas="c-ld.so">ld.so</primary>
656 </indexterm>
657 </listitem>
658 </varlistentry>
659
660 <varlistentry id="libBrokenLocale">
661 <term><filename class="libraryfile">libBrokenLocale</filename></term>
662 <listitem>
663 <para>Used internally by Glibc as a gross hack to get broken programs
664 (e.g., some Motif applications) running. See comments in
665 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
666 for more information</para>
667 <indexterm zone="ch-system-glibc libBrokenLocale">
668 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
669 </indexterm>
670 </listitem>
671 </varlistentry>
672
673 <varlistentry id="libSegFault">
674 <term><filename class="libraryfile">libSegFault</filename></term>
675 <listitem>
676 <para>The segmentation fault signal handler, used by
677 <command>catchsegv</command></para>
678 <indexterm zone="ch-system-glibc libSegFault">
679 <primary sortas="c-libSegFault">libSegFault</primary>
680 </indexterm>
681 </listitem>
682 </varlistentry>
683
684 <varlistentry id="libanl">
685 <term><filename class="libraryfile">libanl</filename></term>
686 <listitem>
687 <para>An asynchronous name lookup library</para>
688 <indexterm zone="ch-system-glibc libanl">
689 <primary sortas="c-libanl">libanl</primary>
690 </indexterm>
691 </listitem>
692 </varlistentry>
693
694 <varlistentry id="libbsd-compat">
695 <term><filename class="libraryfile">libbsd-compat</filename></term>
696 <listitem>
697 <para>Provides the portability needed in order to run certain
698 Berkeley Software Distribution (BSD) programs under Linux</para>
699 <indexterm zone="ch-system-glibc libbsd-compat">
700 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
701 </indexterm>
702 </listitem>
703 </varlistentry>
704
705 <varlistentry id="libc">
706 <term><filename class="libraryfile">libc</filename></term>
707 <listitem>
708 <para>The main C library</para>
709 <indexterm zone="ch-system-glibc libc">
710 <primary sortas="c-libc">libc</primary>
711 </indexterm>
712 </listitem>
713 </varlistentry>
714
715 <varlistentry id="libcidn">
716 <term><filename class="libraryfile">libcidn</filename></term>
717 <listitem>
718 <para>Used internally by Glibc for handling internationalized domain
719 names in the <function>getaddrinfo()</function> function</para>
720 <indexterm zone="ch-system-glibc libcrypt">
721 <primary sortas="c-libcrypt">libcrypt</primary>
722 </indexterm>
723 </listitem>
724 </varlistentry>
725
726 <varlistentry id="libcrypt">
727 <term><filename class="libraryfile">libcrypt</filename></term>
728 <listitem>
729 <para>The cryptography library</para>
730 <indexterm zone="ch-system-glibc libcrypt">
731 <primary sortas="c-libcrypt">libcrypt</primary>
732 </indexterm>
733 </listitem>
734 </varlistentry>
735
736 <varlistentry id="libdl">
737 <term><filename class="libraryfile">libdl</filename></term>
738 <listitem>
739 <para>The dynamic linking interface library</para>
740 <indexterm zone="ch-system-glibc libdl">
741 <primary sortas="c-libdl">libdl</primary>
742 </indexterm>
743 </listitem>
744 </varlistentry>
745
746 <varlistentry id="libg">
747 <term><filename class="libraryfile">libg</filename></term>
748 <listitem>
749 <para>Dummy library containing no functions. Previously was a runtime
750 library for <command>g++</command></para>
751 <indexterm zone="ch-system-glibc libg">
752 <primary sortas="c-libg">libg</primary>
753 </indexterm>
754 </listitem>
755 </varlistentry>
756
757 <varlistentry id="libieee">
758 <term><filename class="libraryfile">libieee</filename></term>
759 <listitem>
760 <para>Linking in this module forces error handling rules for math
761 functions as defined by the Institute of Electrical and Electronic
762 Engineers (IEEE). The default is POSIX.1 error handling</para>
763 <indexterm zone="ch-system-glibc libieee">
764 <primary sortas="c-libieee">libieee</primary>
765 </indexterm>
766 </listitem>
767 </varlistentry>
768
769 <varlistentry id="libm">
770 <term><filename class="libraryfile">libm</filename></term>
771 <listitem>
772 <para>The mathematical library</para>
773 <indexterm zone="ch-system-glibc libm">
774 <primary sortas="c-libm">libm</primary>
775 </indexterm>
776 </listitem>
777 </varlistentry>
778
779 <varlistentry id="libmcheck">
780 <term><filename class="libraryfile">libmcheck</filename></term>
781 <listitem>
782 <para>Turns on memory allocation checking when linked to</para>
783 <indexterm zone="ch-system-glibc libmcheck">
784 <primary sortas="c-libmcheck">libmcheck</primary>
785 </indexterm>
786 </listitem>
787 </varlistentry>
788
789 <varlistentry id="libmemusage">
790 <term><filename class="libraryfile">libmemusage</filename></term>
791 <listitem>
792 <para>Used by <command>memusage</command> to help collect
793 information about the memory usage of a program</para>
794 <indexterm zone="ch-system-glibc libmemusage">
795 <primary sortas="c-libmemusage">libmemusage</primary>
796 </indexterm>
797 </listitem>
798 </varlistentry>
799
800 <varlistentry id="libnsl">
801 <term><filename class="libraryfile">libnsl</filename></term>
802 <listitem>
803 <para>The network services library</para>
804 <indexterm zone="ch-system-glibc libnsl">
805 <primary sortas="c-libnsl">libnsl</primary>
806 </indexterm>
807 </listitem>
808 </varlistentry>
809
810 <varlistentry id="libnss">
811 <term><filename class="libraryfile">libnss</filename></term>
812 <listitem>
813 <para>The Name Service Switch libraries, containing functions for
814 resolving host names, user names, group names, aliases, services,
815 protocols, etc.</para>
816 <indexterm zone="ch-system-glibc libnss">
817 <primary sortas="c-libnss">libnss</primary>
818 </indexterm>
819 </listitem>
820 </varlistentry>
821
822 <varlistentry id="libpcprofile">
823 <term><filename class="libraryfile">libpcprofile</filename></term>
824 <listitem>
825 <para>Contains profiling functions used to track the amount of CPU
826 time spent in specific source code lines</para>
827 <indexterm zone="ch-system-glibc libpcprofile">
828 <primary sortas="c-libpcprofile">libpcprofile</primary>
829 </indexterm>
830 </listitem>
831 </varlistentry>
832
833 <varlistentry id="libpthread">
834 <term><filename class="libraryfile">libpthread</filename></term>
835 <listitem>
836 <para>The POSIX threads library</para>
837 <indexterm zone="ch-system-glibc libpthread">
838 <primary sortas="c-libpthread">libpthread</primary>
839 </indexterm>
840 </listitem>
841 </varlistentry>
842
843 <varlistentry id="libresolv">
844 <term><filename class="libraryfile">libresolv</filename></term>
845 <listitem>
846 <para>Contains functions for creating, sending, and interpreting
847 packets to the Internet domain name servers</para>
848 <indexterm zone="ch-system-glibc libresolv">
849 <primary sortas="c-libresolv">libresolv</primary>
850 </indexterm>
851 </listitem>
852 </varlistentry>
853
854 <varlistentry id="librpcsvc">
855 <term><filename class="libraryfile">librpcsvc</filename></term>
856 <listitem>
857 <para>Contains functions providing miscellaneous RPC services</para>
858 <indexterm zone="ch-system-glibc librpcsvc">
859 <primary sortas="c-librpcsvc">librpcsvc</primary>
860 </indexterm>
861 </listitem>
862 </varlistentry>
863
864 <varlistentry id="librt">
865 <term><filename class="libraryfile">librt</filename></term>
866 <listitem>
867 <para>Contains functions providing most of the interfaces specified
868 by the POSIX.1b Realtime Extension</para>
869 <indexterm zone="ch-system-glibc librt">
870 <primary sortas="c-librt">librt</primary>
871 </indexterm>
872 </listitem>
873 </varlistentry>
874
875 <varlistentry id="libthread_db">
876 <term><filename class="libraryfile">libthread_db</filename></term>
877 <listitem>
878 <para>Contains functions useful for building debuggers for
879 multi-threaded programs</para>
880 <indexterm zone="ch-system-glibc libthread_db">
881 <primary sortas="c-libthread_db">libthread_db</primary>
882 </indexterm>
883 </listitem>
884 </varlistentry>
885
886 <varlistentry id="libutil">
887 <term><filename class="libraryfile">libutil</filename></term>
888 <listitem>
889 <para>Contains code for <quote>standard</quote> functions used in
890 many different Unix utilities</para>
891 <indexterm zone="ch-system-glibc libutil">
892 <primary sortas="c-libutil">libutil</primary>
893 </indexterm>
894 </listitem>
895 </varlistentry>
896
897 </variablelist>
898
899 </sect2>
900
901</sect1>
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