source: chapter06/glibc.xml@ fd40de87

10.0 10.0-rc1 10.1 10.1-rc1 11.0 11.0-rc1 11.0-rc2 11.0-rc3 11.1 11.1-rc1 11.2 11.2-rc1 11.3 11.3-rc1 12.0 12.0-rc1 12.1 12.1-rc1 6.5 6.6 6.7 6.8 7.0 7.1 7.2 7.3 7.4 7.5 7.5-systemd 7.6 7.6-systemd 7.7 7.7-systemd 7.8 7.8-systemd 7.9 7.9-systemd 8.0 8.1 8.2 8.3 8.4 9.0 9.1 arm bdubbs/gcc13 ml-11.0 multilib renodr/libudev-from-systemd s6-init trunk xry111/arm64 xry111/arm64-12.0 xry111/clfs-ng xry111/lfs-next xry111/loongarch xry111/loongarch-12.0 xry111/loongarch-12.1 xry111/mips64el xry111/pip3 xry111/rust-wip-20221008 xry111/update-glibc
Last change on this file since fd40de87 was fd40de87, checked in by Bruce Dubbs <bdubbs@…>, 15 years ago

Various edits. Update glibc to fix a make check error.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8921 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
  • Property mode set to 100644
File size: 33.4 KB
Line 
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 <para>The Glibc documentation recommends building Glibc outside of the source
112 directory in a dedicated build directory:</para>
113
114<screen><userinput remap="pre">mkdir -v ../glibc-build
115cd ../glibc-build</userinput></screen>
116
117 <para>As in Chapter 5, add the needed compiler flags to CFLAGS for x86 machines.
118 Here, the optimization of the library is also set for the gcc compiler to
119 enhance compilation speed (-pipe) and package performance (-O3).</para>
120
121<screen><userinput remap="configure">case `uname -m` in
122 i?86) echo "CFLAGS += -march=i486 -mtune=native -O3 -pipe" &gt; configparms ;;
123esac</userinput></screen>
124
125 <para>Prepare Glibc for compilation:</para>
126
127<screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/usr \
128 --disable-profile --enable-add-ons \
129 --enable-kernel=2.6.0 --libexecdir=/usr/lib/glibc</userinput></screen>
130
131 <variablelist>
132 <title>The meaning of the new configure options:</title>
133
134 <varlistentry>
135 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
136 <listitem>
137 <para>This changes the location of the <command>pt_chown</command>
138 program from its default of <filename
139 class="directory">/usr/libexec</filename> to <filename
140 class="directory">/usr/lib/glibc</filename>.</para>
141 </listitem>
142 </varlistentry>
143
144 </variablelist>
145
146 <para>Compile the package:</para>
147
148<screen><userinput remap="make">make</userinput></screen>
149
150 <important>
151 <para>In this section, the test suite for Glibc is considered critical.
152 Do not skip it under any circumstance.</para>
153 </important>
154
155 <para>Before running the tests, copy a file from the source tree into our
156 build tree to prevent a couple of test failures, then test the
157 results:</para>
158
159<screen><userinput remap="test">cp -v ../glibc-&glibc-version;/iconvdata/gconv-modules iconvdata
160make -k check 2&gt;&amp;1 | tee glibc-check-log
161grep Error glibc-check-log</userinput></screen>
162
163 <para>You will probably see an expected (ignored) failure in the
164 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
165 is somewhat dependent on the host system. This is a list of the most
166 common issues:</para>
167
168 <itemizedlist>
169 <!-- Check again after updating from gcc-4.1.x -->
170 <listitem>
171 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
172 using the 4.1 series of GCC.</para>
173 </listitem>
174 <!-- Was true in glibc-2.3.6 -->
175 <listitem>
176 <para>The <emphasis>nptl/tst-clock2</emphasis> and
177 <emphasis>tst-attr3</emphasis> tests sometimes
178 fail. The reason is not completely understood, but indications
179 are that a heavy system load can trigger these failures.</para>
180 </listitem>
181 <listitem>
182 <para>The math tests sometimes fail when running on
183 systems where the CPU is not a relatively new genuine Intel or
184 authentic AMD processor.</para>
185 </listitem>
186 <listitem>
187 <para>If you have mounted the LFS partition with the
188 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
189 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
190 use the <parameter>noatime</parameter> option while building LFS.</para>
191 </listitem>
192 <listitem>
193 <para>When running on older and slower hardware or on systems under
194 load, some tests can fail because of test timeouts being exceeded.</para>
195 </listitem>
196 </itemizedlist>
197
198 <para>Though it is a harmless message, the install stage of Glibc will
199 complain about the absence of <filename>/etc/ld.so.conf</filename>.
200 Prevent this warning with:</para>
201
202<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
203
204 <para>Install the package:</para>
205
206<screen><userinput remap="install">make install</userinput></screen>
207
208 <para>The locales that can make the system respond in a different language
209 were not installed by the above command. None of the locales are required,
210 but if some of them are missing, testsuites of the future packages would
211 skip important testcases.</para>
212
213 <para>Individual locales can be installed using the
214 <command>localedef</command> program. E.g., the first
215 <command>localedef</command> command below combines the
216 <filename>/usr/share/i18n/locales/cs_CZ</filename>
217 charset-independent locale definition with the
218 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
219 charmap definition and appends the result to the
220 <filename>/usr/lib/locale/locale-archive</filename> file.
221 The following instructions will install the minimum set of
222 locales necessary for the optimal coverage of tests:</para>
223
224<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
225localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
226localedef -i de_DE -f ISO-8859-1 de_DE
227localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
228localedef -i de_DE -f UTF-8 de_DE.UTF-8
229localedef -i en_HK -f ISO-8859-1 en_HK
230localedef -i en_PH -f ISO-8859-1 en_PH
231localedef -i en_US -f ISO-8859-1 en_US
232localedef -i en_US -f UTF-8 en_US.UTF-8
233localedef -i es_MX -f ISO-8859-1 es_MX
234localedef -i fa_IR -f UTF-8 fa_IR
235localedef -i fr_FR -f ISO-8859-1 fr_FR
236localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
237localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
238localedef -i it_IT -f ISO-8859-1 it_IT
239localedef -i ja_JP -f EUC-JP ja_JP
240localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
241localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
242
243 <para>In addition, install the locale for your own country, language and
244 character set.</para>
245
246 <para>Alternatively, install all locales listed in the
247 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
248 (it includes every locale listed above and many more) at once with the
249 following time-consuming command:</para>
250
251<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
252
253 <para>Then use the <command>localedef</command> command to create and
254 install locales not listed in the
255 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
256 in the unlikely case you need them.</para>
257 <!-- The Live CD patches the localedata/SUPPORTED file instead of
258 running localedef, the results are equivalent -->
259
260 </sect2>
261
262 <sect2 id="conf-glibc" role="configuration">
263 <title>Configuring Glibc</title>
264
265 <indexterm zone="conf-glibc">
266 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
267 </indexterm>
268
269 <indexterm zone="conf-glibc">
270 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
271 </indexterm>
272
273 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
274 because, although Glibc provides defaults when this file is missing or corrupt,
275 the Glibc defaults do not work well in a networked environment. The time zone
276 also needs to be configured.</para>
277
278 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
279 following:</para>
280
281<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
282<literal># Begin /etc/nsswitch.conf
283
284passwd: files
285group: files
286shadow: files
287
288hosts: files dns
289networks: files
290
291protocols: files
292services: files
293ethers: files
294rpc: files
295
296# End /etc/nsswitch.conf</literal>
297EOF</userinput></screen>
298
299 <para>One way to determine the local time zone, run the following
300 script:</para>
301
302<screen role="nodump"><userinput>tzselect</userinput></screen>
303
304 <para>After answering a few questions about the location, the script will
305 output the name of the time zone (e.g.,
306 <emphasis>America/Edmonton</emphasis>). There are also some other possible
307 timezones listed in <filename
308 class='directory'>/usr/share/zoneinfo</filename> such as
309 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
310 are not identified by the script but can be used.</para>
311
312 <para>Then create the <filename>/etc/localtime</filename> file by
313 running:</para>
314
315<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
316 /etc/localtime</userinput></screen>
317
318 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
319 time zone selected (e.g., Canada/Eastern).</para>
320
321 <variablelist>
322 <title>The meaning of the cp option:</title>
323
324 <varlistentry>
325 <term><parameter>--remove-destination</parameter></term>
326 <listitem>
327 <para>This is needed to force removal of the already existing symbolic
328 link. The reason for copying the file instead of using a symlink is to
329 cover the situation where <filename class="directory">/usr</filename>
330 is on a separate partition. This could be important when booted into
331 single user mode.</para>
332 </listitem>
333 </varlistentry>
334
335 </variablelist>
336
337 </sect2>
338
339 <sect2 id="conf-ld" role="configuration">
340 <title>Configuring the Dynamic Loader</title>
341
342 <indexterm zone="conf-ld">
343 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
344 </indexterm>
345
346 <para>By default, the dynamic loader (<filename
347 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
348 <filename class="directory">/lib</filename> and <filename
349 class="directory">/usr/lib</filename> for dynamic libraries that are
350 needed by programs as they are run. However, if there are libraries in
351 directories other than <filename class="directory">/lib</filename> and
352 <filename class="directory">/usr/lib</filename>, these need to be added
353 to the <filename>/etc/ld.so.conf</filename> file in order for the
354 dynamic loader to find them. Two directories that are commonly known
355 to contain additional libraries are <filename
356 class="directory">/usr/local/lib</filename> and <filename
357 class="directory">/opt/lib</filename>, so add those directories to the
358 dynamic loader's search path.</para>
359
360 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
361 following:</para>
362
363<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
364<literal># Begin /etc/ld.so.conf
365
366/usr/local/lib
367/opt/lib
368
369# End /etc/ld.so.conf</literal>
370EOF</userinput></screen>
371
372 </sect2>
373
374 <sect2 id="contents-glibc" role="content">
375 <title>Contents of Glibc</title>
376
377 <segmentedlist>
378 <segtitle>Installed programs</segtitle>
379 <segtitle>Installed libraries</segtitle>
380
381 <seglistitem>
382 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
383 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
384 pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
385 zdump, and zic</seg>
386 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
387 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
388 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
389 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
390 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
391 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
392 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
393 libthread_db.so, and libutil.{a,so}</seg>
394 </seglistitem>
395 </segmentedlist>
396
397 <variablelist>
398 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
399 <?dbfo list-presentation="list"?>
400 <?dbhtml list-presentation="table"?>
401
402 <varlistentry id="catchsegv">
403 <term><command>catchsegv</command></term>
404 <listitem>
405 <para>Can be used to create a stack trace when a program
406 terminates with a segmentation fault</para>
407 <indexterm zone="ch-system-glibc catchsegv">
408 <primary sortas="b-catchsegv">catchsegv</primary>
409 </indexterm>
410 </listitem>
411 </varlistentry>
412
413 <varlistentry id="gencat">
414 <term><command>gencat</command></term>
415 <listitem>
416 <para>Generates message catalogues</para>
417 <indexterm zone="ch-system-glibc gencat">
418 <primary sortas="b-gencat">gencat</primary>
419 </indexterm>
420 </listitem>
421 </varlistentry>
422
423 <varlistentry id="getconf">
424 <term><command>getconf</command></term>
425 <listitem>
426 <para>Displays the system configuration values for file system
427 specific variables</para>
428 <indexterm zone="ch-system-glibc getconf">
429 <primary sortas="b-getconf">getconf</primary>
430 </indexterm>
431 </listitem>
432 </varlistentry>
433
434 <varlistentry id="getent">
435 <term><command>getent</command></term>
436 <listitem>
437 <para>Gets entries from an administrative database</para>
438 <indexterm zone="ch-system-glibc getent">
439 <primary sortas="b-getent">getent</primary>
440 </indexterm>
441 </listitem>
442 </varlistentry>
443
444 <varlistentry id="iconv">
445 <term><command>iconv</command></term>
446 <listitem>
447 <para>Performs character set conversion</para>
448 <indexterm zone="ch-system-glibc iconv">
449 <primary sortas="b-iconv">iconv</primary>
450 </indexterm>
451 </listitem>
452 </varlistentry>
453
454 <varlistentry id="iconvconfig">
455 <term><command>iconvconfig</command></term>
456 <listitem>
457 <para>Creates fastloading <command>iconv</command> module configuration
458 files</para>
459 <indexterm zone="ch-system-glibc iconvconfig">
460 <primary sortas="b-iconvconfig">iconvconfig</primary>
461 </indexterm>
462 </listitem>
463 </varlistentry>
464
465 <varlistentry id="ldconfig">
466 <term><command>ldconfig</command></term>
467 <listitem>
468 <para>Configures the dynamic linker runtime bindings</para>
469 <indexterm zone="ch-system-glibc ldconfig">
470 <primary sortas="b-ldconfig">ldconfig</primary>
471 </indexterm>
472 </listitem>
473 </varlistentry>
474
475 <varlistentry id="ldd">
476 <term><command>ldd</command></term>
477 <listitem>
478 <para>Reports which shared libraries are required
479 by each given program or shared library</para>
480 <indexterm zone="ch-system-glibc ldd">
481 <primary sortas="b-ldd">ldd</primary>
482 </indexterm>
483 </listitem>
484 </varlistentry>
485
486 <varlistentry id="lddlibc4">
487 <term><command>lddlibc4</command></term>
488 <listitem>
489 <para>Assists <command>ldd</command> with object files</para>
490 <indexterm zone="ch-system-glibc lddlibc4">
491 <primary sortas="b-lddlibc4">lddlibc4</primary>
492 </indexterm>
493 </listitem>
494 </varlistentry>
495
496 <varlistentry id="locale">
497 <term><command>locale</command></term>
498 <listitem>
499 <para>Prints various information about the current locale</para>
500 <indexterm zone="ch-system-glibc locale">
501 <primary sortas="b-locale">locale</primary>
502 </indexterm>
503 </listitem>
504 </varlistentry>
505
506 <varlistentry id="localedef">
507 <term><command>localedef</command></term>
508 <listitem>
509 <para>Compiles locale specifications</para>
510 <indexterm zone="ch-system-glibc localedef">
511 <primary sortas="b-localedef">localedef</primary>
512 </indexterm>
513 </listitem>
514 </varlistentry>
515
516 <varlistentry id="mtrace">
517 <term><command>mtrace</command></term>
518 <listitem>
519 <para>Reads and interprets a memory trace file and displays a summary
520 in human-readable format</para>
521 <indexterm zone="ch-system-glibc mtrace">
522 <primary sortas="b-mtrace">mtrace</primary>
523 </indexterm>
524 </listitem>
525 </varlistentry>
526
527 <varlistentry id="nscd">
528 <term><command>nscd</command></term>
529 <listitem>
530 <para>A daemon that provides a cache for the most common name
531 service requests</para>
532 <indexterm zone="ch-system-glibc nscd">
533 <primary sortas="b-nscd">nscd</primary>
534 </indexterm>
535 </listitem>
536 </varlistentry>
537
538 <varlistentry id="pcprofiledump">
539 <term><command>pcprofiledump</command></term>
540 <listitem>
541 <para>Dumps information generated by PC profiling</para>
542 <indexterm zone="ch-system-glibc pcprofiledump">
543 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="pt_chown">
549 <term><command>pt_chown</command></term>
550 <listitem>
551 <para>A helper program for <command>grantpt</command> to set the owner,
552 group and access permissions of a slave pseudo terminal</para>
553 <indexterm zone="ch-system-glibc pt_chown">
554 <primary sortas="b-pt_chown">pt_chown</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="rpcgen">
560 <term><command>rpcgen</command></term>
561 <listitem>
562 <para>Generates C code to implement the Remote Procedure Call (RPC)
563 protocol</para>
564 <indexterm zone="ch-system-glibc rpcgen">
565 <primary sortas="b-rpcgen">rpcgen</primary>
566 </indexterm>
567 </listitem>
568 </varlistentry>
569
570 <varlistentry id="rpcinfo">
571 <term><command>rpcinfo</command></term>
572 <listitem>
573 <para>Makes an RPC call to an RPC server</para>
574 <indexterm zone="ch-system-glibc rpcinfo">
575 <primary sortas="b-rpcinfo">rpcinfo</primary>
576 </indexterm>
577 </listitem>
578 </varlistentry>
579
580 <varlistentry id="sln">
581 <term><command>sln</command></term>
582 <listitem>
583 <para>A statically linked <command>ln</command> program</para>
584 <indexterm zone="ch-system-glibc sln">
585 <primary sortas="b-sln">sln</primary>
586 </indexterm>
587 </listitem>
588 </varlistentry>
589
590 <varlistentry id="sprof">
591 <term><command>sprof</command></term>
592 <listitem>
593 <para>Reads and displays shared object profiling data</para>
594 <indexterm zone="ch-system-glibc sprof">
595 <primary sortas="b-sprof">sprof</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="tzselect">
601 <term><command>tzselect</command></term>
602 <listitem>
603 <para>Asks the user about the location of the system and reports
604 the corresponding time zone description</para>
605 <indexterm zone="ch-system-glibc tzselect">
606 <primary sortas="b-tzselect">tzselect</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610
611 <varlistentry id="xtrace">
612 <term><command>xtrace</command></term>
613 <listitem>
614 <para>Traces the execution of a program by printing the currently
615 executed function</para>
616 <indexterm zone="ch-system-glibc xtrace">
617 <primary sortas="b-xtrace">xtrace</primary>
618 </indexterm>
619 </listitem>
620 </varlistentry>
621
622 <varlistentry id="zdump">
623 <term><command>zdump</command></term>
624 <listitem>
625 <para>The time zone dumper</para>
626 <indexterm zone="ch-system-glibc zdump">
627 <primary sortas="b-zdump">zdump</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry>
631
632 <varlistentry id="zic">
633 <term><command>zic</command></term>
634 <listitem>
635 <para>The time zone compiler</para>
636 <indexterm zone="ch-system-glibc zic">
637 <primary sortas="b-zic">zic</primary>
638 </indexterm>
639 </listitem>
640 </varlistentry>
641
642 <varlistentry id="ld.so">
643 <term><filename class="libraryfile">ld.so</filename></term>
644 <listitem>
645 <para>The helper program for shared library executables</para>
646 <indexterm zone="ch-system-glibc ld.so">
647 <primary sortas="c-ld.so">ld.so</primary>
648 </indexterm>
649 </listitem>
650 </varlistentry>
651
652 <varlistentry id="libBrokenLocale">
653 <term><filename class="libraryfile">libBrokenLocale</filename></term>
654 <listitem>
655 <para>Used internally by Glibc as a gross hack to get broken programs
656 (e.g., some Motif applications) running. See comments in
657 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
658 for more information</para>
659 <indexterm zone="ch-system-glibc libBrokenLocale">
660 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
661 </indexterm>
662 </listitem>
663 </varlistentry>
664
665 <varlistentry id="libSegFault">
666 <term><filename class="libraryfile">libSegFault</filename></term>
667 <listitem>
668 <para>The segmentation fault signal handler, used by
669 <command>catchsegv</command></para>
670 <indexterm zone="ch-system-glibc libSegFault">
671 <primary sortas="c-libSegFault">libSegFault</primary>
672 </indexterm>
673 </listitem>
674 </varlistentry>
675
676 <varlistentry id="libanl">
677 <term><filename class="libraryfile">libanl</filename></term>
678 <listitem>
679 <para>An asynchronous name lookup library</para>
680 <indexterm zone="ch-system-glibc libanl">
681 <primary sortas="c-libanl">libanl</primary>
682 </indexterm>
683 </listitem>
684 </varlistentry>
685
686 <varlistentry id="libbsd-compat">
687 <term><filename class="libraryfile">libbsd-compat</filename></term>
688 <listitem>
689 <para>Provides the portability needed in order to run certain
690 Berkeley Software Distribution (BSD) programs under Linux</para>
691 <indexterm zone="ch-system-glibc libbsd-compat">
692 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
693 </indexterm>
694 </listitem>
695 </varlistentry>
696
697 <varlistentry id="libc">
698 <term><filename class="libraryfile">libc</filename></term>
699 <listitem>
700 <para>The main C library</para>
701 <indexterm zone="ch-system-glibc libc">
702 <primary sortas="c-libc">libc</primary>
703 </indexterm>
704 </listitem>
705 </varlistentry>
706
707 <varlistentry id="libcidn">
708 <term><filename class="libraryfile">libcidn</filename></term>
709 <listitem>
710 <para>Used internally by Glibc for handling internationalized domain
711 names in the <function>getaddrinfo()</function> function</para>
712 <indexterm zone="ch-system-glibc libcrypt">
713 <primary sortas="c-libcrypt">libcrypt</primary>
714 </indexterm>
715 </listitem>
716 </varlistentry>
717
718 <varlistentry id="libcrypt">
719 <term><filename class="libraryfile">libcrypt</filename></term>
720 <listitem>
721 <para>The cryptography library</para>
722 <indexterm zone="ch-system-glibc libcrypt">
723 <primary sortas="c-libcrypt">libcrypt</primary>
724 </indexterm>
725 </listitem>
726 </varlistentry>
727
728 <varlistentry id="libdl">
729 <term><filename class="libraryfile">libdl</filename></term>
730 <listitem>
731 <para>The dynamic linking interface library</para>
732 <indexterm zone="ch-system-glibc libdl">
733 <primary sortas="c-libdl">libdl</primary>
734 </indexterm>
735 </listitem>
736 </varlistentry>
737
738 <varlistentry id="libg">
739 <term><filename class="libraryfile">libg</filename></term>
740 <listitem>
741 <para>Dummy library containing no functions. Previously was a runtime
742 library for <command>g++</command></para>
743 <indexterm zone="ch-system-glibc libg">
744 <primary sortas="c-libg">libg</primary>
745 </indexterm>
746 </listitem>
747 </varlistentry>
748
749 <varlistentry id="libieee">
750 <term><filename class="libraryfile">libieee</filename></term>
751 <listitem>
752 <para>Linking in this module forces error handling rules for math
753 functions as defined by the Institute of Electrical and Electronic
754 Engineers (IEEE). The default is POSIX.1 error handling</para>
755 <indexterm zone="ch-system-glibc libieee">
756 <primary sortas="c-libieee">libieee</primary>
757 </indexterm>
758 </listitem>
759 </varlistentry>
760
761 <varlistentry id="libm">
762 <term><filename class="libraryfile">libm</filename></term>
763 <listitem>
764 <para>The mathematical library</para>
765 <indexterm zone="ch-system-glibc libm">
766 <primary sortas="c-libm">libm</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="libmcheck">
772 <term><filename class="libraryfile">libmcheck</filename></term>
773 <listitem>
774 <para>Turns on memory allocation checking when linked to</para>
775 <indexterm zone="ch-system-glibc libmcheck">
776 <primary sortas="c-libmcheck">libmcheck</primary>
777 </indexterm>
778 </listitem>
779 </varlistentry>
780
781 <varlistentry id="libmemusage">
782 <term><filename class="libraryfile">libmemusage</filename></term>
783 <listitem>
784 <para>Used by <command>memusage</command> to help collect
785 information about the memory usage of a program</para>
786 <indexterm zone="ch-system-glibc libmemusage">
787 <primary sortas="c-libmemusage">libmemusage</primary>
788 </indexterm>
789 </listitem>
790 </varlistentry>
791
792 <varlistentry id="libnsl">
793 <term><filename class="libraryfile">libnsl</filename></term>
794 <listitem>
795 <para>The network services library</para>
796 <indexterm zone="ch-system-glibc libnsl">
797 <primary sortas="c-libnsl">libnsl</primary>
798 </indexterm>
799 </listitem>
800 </varlistentry>
801
802 <varlistentry id="libnss">
803 <term><filename class="libraryfile">libnss</filename></term>
804 <listitem>
805 <para>The Name Service Switch libraries, containing functions for
806 resolving host names, user names, group names, aliases, services,
807 protocols, etc.</para>
808 <indexterm zone="ch-system-glibc libnss">
809 <primary sortas="c-libnss">libnss</primary>
810 </indexterm>
811 </listitem>
812 </varlistentry>
813
814 <varlistentry id="libpcprofile">
815 <term><filename class="libraryfile">libpcprofile</filename></term>
816 <listitem>
817 <para>Contains profiling functions used to track the amount of CPU
818 time spent in specific source code lines</para>
819 <indexterm zone="ch-system-glibc libpcprofile">
820 <primary sortas="c-libpcprofile">libpcprofile</primary>
821 </indexterm>
822 </listitem>
823 </varlistentry>
824
825 <varlistentry id="libpthread">
826 <term><filename class="libraryfile">libpthread</filename></term>
827 <listitem>
828 <para>The POSIX threads library</para>
829 <indexterm zone="ch-system-glibc libpthread">
830 <primary sortas="c-libpthread">libpthread</primary>
831 </indexterm>
832 </listitem>
833 </varlistentry>
834
835 <varlistentry id="libresolv">
836 <term><filename class="libraryfile">libresolv</filename></term>
837 <listitem>
838 <para>Contains functions for creating, sending, and interpreting
839 packets to the Internet domain name servers</para>
840 <indexterm zone="ch-system-glibc libresolv">
841 <primary sortas="c-libresolv">libresolv</primary>
842 </indexterm>
843 </listitem>
844 </varlistentry>
845
846 <varlistentry id="librpcsvc">
847 <term><filename class="libraryfile">librpcsvc</filename></term>
848 <listitem>
849 <para>Contains functions providing miscellaneous RPC services</para>
850 <indexterm zone="ch-system-glibc librpcsvc">
851 <primary sortas="c-librpcsvc">librpcsvc</primary>
852 </indexterm>
853 </listitem>
854 </varlistentry>
855
856 <varlistentry id="librt">
857 <term><filename class="libraryfile">librt</filename></term>
858 <listitem>
859 <para>Contains functions providing most of the interfaces specified
860 by the POSIX.1b Realtime Extension</para>
861 <indexterm zone="ch-system-glibc librt">
862 <primary sortas="c-librt">librt</primary>
863 </indexterm>
864 </listitem>
865 </varlistentry>
866
867 <varlistentry id="libthread_db">
868 <term><filename class="libraryfile">libthread_db</filename></term>
869 <listitem>
870 <para>Contains functions useful for building debuggers for
871 multi-threaded programs</para>
872 <indexterm zone="ch-system-glibc libthread_db">
873 <primary sortas="c-libthread_db">libthread_db</primary>
874 </indexterm>
875 </listitem>
876 </varlistentry>
877
878 <varlistentry id="libutil">
879 <term><filename class="libraryfile">libutil</filename></term>
880 <listitem>
881 <para>Contains code for <quote>standard</quote> functions used in
882 many different Unix utilities</para>
883 <indexterm zone="ch-system-glibc libutil">
884 <primary sortas="c-libutil">libutil</primary>
885 </indexterm>
886 </listitem>
887 </varlistentry>
888
889 </variablelist>
890
891 </sect2>
892
893</sect1>
Note: See TracBrowser for help on using the repository browser.