source: chapter06/glibc.xml@ 4a5a108

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 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 4a5a108 was 4a5a108, checked in by Bruce Dubbs <bdubbs@…>, 12 years ago

Revert part of teh last change

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9964 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
  • Property mode set to 100644
File size: 37.9 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<!--
65 This should have been fixed a long time ago.
66
67 <para>In the vi_VN.TCVN locale, <command>bash</command> enters an infinite
68 loop at startup. It is unknown whether this is a <command>bash</command>
69 bug or a Glibc problem. Disable installation of this locale in order to
70 avoid the problem:</para>
71
72<screen><userinput remap="pre">sed -i '/vi_VN.TCVN/d' localedata/SUPPORTED</userinput></screen>
73-->
74
75 <para>Fix a problem that causes the build to fail in the LFS environment:</para>
76
77<screen><userinput remap="pre">sed -i 's#&lt;rpc/types.h&gt;#"rpc/types.h"#' sunrpc/rpc_clntout.c</userinput></screen>
78
79<!-- <para>When running <command>make install</command>, a script called
80 <filename>test-installation.pl</filename> performs a small sanity test on
81 our newly installed Glibc. However, because our toolchain still points to
82 the <filename class="directory">/tools</filename> directory, the sanity
83 test would be carried out against the wrong Glibc. We can force the script
84 to check the Glibc we have just installed with the following:</para>
85
86<screen><userinput remap="pre">DL=$(readelf -l /bin/sh | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
87sed -i &quot;s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=$DL -o|&quot; \
88 scripts/test-installation.pl
89unset DL</userinput></screen>-->
90
91 <para>When running <command>make install</command>, a script called
92 <filename>test-installation.pl</filename> performs a small sanity test on
93 our newly installed Glibc. However, it contains a bug that causes it to
94 fail, so prevent it from running by issuing the following command:</para>
95
96<screen><userinput remap="pre">sed -i '/test-installation.pl/d' Makefile</userinput></screen>
97
98 <para>The <command>ldd</command> shell script contains Bash-specific
99 syntax. Change its default program interpreter to <command>/bin/bash</command>
100 in case another <command>/bin/sh</command> is installed as described in the
101 <ulink url="&blfs-root;view/svn/postlfs/shells.html">Shells</ulink>
102 chapter of the BLFS book:</para>
103
104<screen><userinput remap="pre">sed -i 's|@BASH@|/bin/bash|' elf/ldd.bash.in</userinput></screen>
105
106 <para>The Glibc documentation recommends building Glibc outside of the source
107 directory in a dedicated build directory:</para>
108
109<screen><userinput remap="pre">mkdir -v ../glibc-build
110cd ../glibc-build</userinput></screen>
111<!--
112 <para>As in Chapter 5, add the needed compiler flags to CFLAGS for x86 machines.
113 Here, the optimization of the library is also set for the gcc compiler to
114 enhance compilation speed (-pipe) and package performance (-O3).</para>
115
116<screen><userinput remap="configure">case `uname -m` in
117 i?86) echo "CFLAGS += -march=i486 -mtune=native -O3 -pipe" &gt; configparms ;;
118esac</userinput></screen>
119-->
120 <para>Prepare Glibc for compilation:</para>
121
122<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
123 --prefix=/usr \
124 --disable-profile \
125 --enable-add-ons \
126 --enable-kernel=2.6.25 \
127 --libexecdir=/usr/lib/glibc</userinput></screen>
128
129 <variablelist>
130 <title>The meaning of the new configure options:</title>
131
132 <varlistentry>
133 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
134 <listitem>
135 <para>This changes the location of the <command>pt_chown</command>
136 program from its default of <filename
137 class="directory">/usr/libexec</filename> to <filename
138 class="directory">/usr/lib/glibc</filename>.</para>
139 </listitem>
140 </varlistentry>
141
142 </variablelist>
143
144 <para>Compile the package:</para>
145
146<screen><userinput remap="make">make</userinput></screen>
147
148 <important>
149 <para>In this section, the test suite for Glibc is considered critical.
150 Do not skip it under any circumstance.</para>
151 </important>
152
153 <para>Generally a few tests do not pass, but you can generally ignore
154 any of the test failures listed below. Now test the build results:</para>
155
156<!-- cp -v ../glibc-&glibc-version;/iconvdata/gconv-modules iconvdata -->
157
158<screen><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log
159grep Error glibc-check-log</userinput></screen>
160
161 <para>You will probably see an expected (ignored) failure in the
162 <emphasis>posix/annexc</emphasis> and
163 <emphasis>conform/run-conformtest</emphasis> tests. In addition the Glibc
164 test suite is somewhat dependent on the host system. This is a list of the
165 most common issues:</para>
166
167 <itemizedlist>
168 <!-- Check again after updating from gcc-4.1.x -->
169 <!-- Haven;t seen this in quite a while <listitem>
170 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
171 using the 4.1 series of GCC.</para>
172 </listitem> -->
173 <!-- Was true in glibc-2.3.6, rt/tst-cpuclock2 in glibc-2.11.1 -->
174
175 <listitem>
176 <para>The <emphasis>nptl/tst-clock2</emphasis>,
177 <emphasis>nptl/tst-attr3</emphasis>,
178 <emphasis>tst/tst-cputimer1</emphasis>, and
179 <emphasis>rt/tst-cpuclock2</emphasis>
180 tests have been known to fail. The
181 reason is not completely understood, but indications are that minor
182 timing issues can trigger these failures.</para>
183 </listitem>
184
185 <listitem>
186 <para>The math tests sometimes fail when running on
187 systems where the CPU is not a relatively new genuine Intel or
188 authentic AMD processor.</para>
189 </listitem>
190
191 <!--
192 <listitem>
193 <para>If you have mounted the LFS partition with the
194 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
195 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
196 use the <parameter>noatime</parameter> option while building LFS.</para>
197 </listitem>
198 -->
199
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.
203 Modifying the make check command to set a TIMEOUTFACTOR is reported to
204 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
205 make -k check</command>).</para>
206 </listitem>
207
208 <listitem>
209 <para>Other tests known to fail on some architectures are posix/bug-regex32,
210 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, and stdio-common/bug22.</para>
211 </listitem>
212
213 </itemizedlist>
214
215 <para>Though it is a harmless message, the install stage of Glibc will
216 complain about the absence of <filename>/etc/ld.so.conf</filename>.
217 Prevent this warning with:</para>
218
219<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
220
221 <para>Install the package:</para>
222
223<screen><userinput remap="install">make install</userinput></screen>
224
225 <para>Install NIS and RPC related headers that are not installed by
226 default; these are required ito rebuild glibc and by several BLFS
227 packages:</para>
228
229<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/sunrpc/rpc/*.h /usr/include/rpc
230cp -v ../glibc-&glibc-version;/sunrpc/rpcsvc/*.h /usr/include/rpcsvc
231cp -v ../glibc-&glibc-version;/nis/rpcsvc/*.h /usr/include/rpcsvc</userinput></screen>
232
233 <para>The locales that can make the system respond in a different language
234 were not installed by the above command. None of the locales are required,
235 but if some of them are missing, test suites of the future packages would
236 skip important testcases.</para>
237
238 <para>Individual locales can be installed using the
239 <command>localedef</command> program. E.g., the first
240 <command>localedef</command> command below combines the
241 <filename>/usr/share/i18n/locales/cs_CZ</filename>
242 charset-independent locale definition with the
243 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
244 charmap definition and appends the result to the
245 <filename>/usr/lib/locale/locale-archive</filename> file.
246 The following instructions will install the minimum set of
247 locales necessary for the optimal coverage of tests:</para>
248
249<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
250localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
251localedef -i de_DE -f ISO-8859-1 de_DE
252localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
253localedef -i de_DE -f UTF-8 de_DE.UTF-8
254localedef -i en_GB -f UTF-8 en_GB.UTF-8
255localedef -i en_HK -f ISO-8859-1 en_HK
256localedef -i en_PH -f ISO-8859-1 en_PH
257localedef -i en_US -f ISO-8859-1 en_US
258localedef -i en_US -f UTF-8 en_US.UTF-8
259localedef -i es_MX -f ISO-8859-1 es_MX
260localedef -i fa_IR -f UTF-8 fa_IR
261localedef -i fr_FR -f ISO-8859-1 fr_FR
262localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
263localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
264localedef -i it_IT -f ISO-8859-1 it_IT
265localedef -i it_IT -f UTF-8 it_IT.UTF-8
266localedef -i ja_JP -f EUC-JP ja_JP
267localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
268localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
269localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
270localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
271
272 <para>In addition, install the locale for your own country, language and
273 character set.</para>
274
275 <para>Alternatively, install all locales listed in the
276 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
277 (it includes every locale listed above and many more) at once with the
278 following time-consuming command:</para>
279
280<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
281
282 <para>Then use the <command>localedef</command> command to create and
283 install locales not listed in the
284 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
285 in the unlikely case you need them.</para>
286 <!-- The Live CD patches the localedata/SUPPORTED file instead of
287 running localedef, the results are equivalent -->
288
289 </sect2>
290
291 <sect2 id="conf-glibc" role="configuration">
292 <title>Configuring Glibc</title>
293
294 <indexterm zone="conf-glibc">
295 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
296 </indexterm>
297
298 <indexterm zone="conf-glibc">
299 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
300 </indexterm>
301
302 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
303 because, although Glibc provides defaults when this file is missing or corrupt,
304 the Glibc defaults do not work well in a networked environment. The time zone
305 also needs to be configured.</para>
306
307 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
308 following:</para>
309
310<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
311<literal># Begin /etc/nsswitch.conf
312
313passwd: files
314group: files
315shadow: files
316
317hosts: files dns
318networks: files
319
320protocols: files
321services: files
322ethers: files
323rpc: files
324
325# End /etc/nsswitch.conf</literal>
326EOF</userinput></screen>
327
328 <para>Install timezone data:</para>
329<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
330
331mkdir -pv /usr/share/zoneinfo/{posix,right}
332
333for tz in etcetera southamerica northamerica europe africa antarctica \
334 asia australasia backward pacificnew solar87 solar88 solar89 systemv; do
335 zic -L /dev/null -d /usr/share/zoneinfo -y "sh yearistype.sh" ${tz}
336 zic -L /dev/null -d /usr/share/zoneinfo/posix -y "sh yearistype.sh" ${tz}
337 zic -L leapseconds -d /usr/share/zoneinfo/right -y "sh yearistype.sh" ${tz}
338done
339
340cp -v zone.tab iso3166.tab /usr/share/zoneinfo
341zic -d /usr/share/zoneinfo -p America/New_York</userinput></screen>
342
343 <variablelist>
344 <title>The meaning of the zic commands:</title>
345
346 <varlistentry>
347 <term><parameter>zic -L /dev/null ...</parameter></term>
348 <listitem>
349 <para>This creates posix timezones, without any leap seconds. It is
350 conventional to put these in both
351 <filename class="directory">zoneinfo</filename> and
352 <filename class="directory">zoneinfo/posix</filename>. It is
353 necessary to put the POSIX timezones in
354 <filename class="directory">zoneinfo</filename>, otherwise various
355 test-suites will report errors. On an embedded system, where space is
356 tight and you do not intend to ever update the timezones, you could save
357 1.9MB by not using the <filename class="directory">posix</filename>
358 directory, but some applications or test-suites might give less good
359 results</para>
360 </listitem>
361 </varlistentry>
362 <varlistentry>
363 <term><parameter>zic -L leapseconds ...</parameter></term>
364 <listitem>
365 <para>This creates right timezones, including leap seconds. On an
366 embedded system, where space is tight and you do not intend to
367 ever update the timezones, or care about the correct time, you could
368 save 1.9MB by omitting the <filename class="directory">right</filename>
369 directory.</para>
370 </listitem>
371 </varlistentry>
372 <varlistentry>
373 <term><parameter>zic ... -p ...</parameter></term>
374 <listitem>
375 <para>This creates the <filename>posixrules</filename> file.</para>
376 </listitem>
377 </varlistentry>
378 </variablelist>
379
380
381 <para>One way to determine the local time zone is to run the following
382 script:</para>
383
384<screen role="nodump"><userinput>tzselect</userinput></screen>
385
386 <para>After answering a few questions about the location, the script will
387 output the name of the time zone (e.g.,
388 <emphasis>America/Edmonton</emphasis>). There are also some other possible
389 timezones listed in <filename
390 class='directory'>/usr/share/zoneinfo</filename> such as
391 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
392 are not identified by the script but can be used.</para>
393
394 <para>Then create the <filename>/etc/localtime</filename> file by
395 running:</para>
396
397<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
398 /etc/localtime</userinput></screen>
399
400 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
401 time zone selected (e.g., Canada/Eastern).</para>
402
403 <variablelist>
404 <title>The meaning of the cp option:</title>
405
406 <varlistentry>
407 <term><parameter>--remove-destination</parameter></term>
408 <listitem>
409 <para>This is needed to force removal of the already existing symbolic
410 link. The reason for copying the file instead of using a symlink is to
411 cover the situation where <filename class="directory">/usr</filename>
412 is on a separate partition. This could be important when booted into
413 single user mode.</para>
414 </listitem>
415 </varlistentry>
416
417 </variablelist>
418
419 </sect2>
420
421 <sect2 id="conf-ld" role="configuration">
422 <title>Configuring the Dynamic Loader</title>
423
424 <indexterm zone="conf-ld">
425 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
426 </indexterm>
427
428 <para>By default, the dynamic loader (<filename
429 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
430 <filename class="directory">/lib</filename> and <filename
431 class="directory">/usr/lib</filename> for dynamic libraries that are
432 needed by programs as they are run. However, if there are libraries in
433 directories other than <filename class="directory">/lib</filename> and
434 <filename class="directory">/usr/lib</filename>, these need to be added
435 to the <filename>/etc/ld.so.conf</filename> file in order for the
436 dynamic loader to find them. Two directories that are commonly known
437 to contain additional libraries are <filename
438 class="directory">/usr/local/lib</filename> and <filename
439 class="directory">/opt/lib</filename>, so add those directories to the
440 dynamic loader's search path.</para>
441
442 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
443 following:</para>
444
445<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
446<literal># Begin /etc/ld.so.conf
447/usr/local/lib
448/opt/lib
449</literal>
450EOF</userinput></screen>
451
452 <para>If desired, the dynamic loader can also search a directory and
453 include the contents of files found there. Generally the files in
454 this include directory are one line specifying the desired library path.
455 To add this capability run the following commands:</para>
456
457<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
458<literal># Add an include directory
459include /etc/ld.so.conf.d/*.conf
460</literal>
461EOF
462mkdir /etc/ld.so.conf.d</userinput></screen>
463
464 </sect2>
465
466 <sect2 id="contents-glibc" role="content">
467 <title>Contents of Glibc</title>
468
469 <segmentedlist>
470 <segtitle>Installed programs</segtitle>
471 <segtitle>Installed libraries</segtitle>
472 <segtitle>Installed directories</segtitle>
473
474 <seglistitem>
475 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
476 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
477 pt_chown, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
478 zdump, and zic</seg>
479 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
480 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
481 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
482 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
483 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
484 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
485 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
486 libthread_db.so, and libutil.{a,so}</seg>
487 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
488 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
489 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
490 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
491 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
492 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
493 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/glibc,
494 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo</seg>
495 </seglistitem>
496 </segmentedlist>
497
498 <variablelist>
499 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
500 <?dbfo list-presentation="list"?>
501 <?dbhtml list-presentation="table"?>
502
503 <varlistentry id="catchsegv">
504 <term><command>catchsegv</command></term>
505 <listitem>
506 <para>Can be used to create a stack trace when a program
507 terminates with a segmentation fault</para>
508 <indexterm zone="ch-system-glibc catchsegv">
509 <primary sortas="b-catchsegv">catchsegv</primary>
510 </indexterm>
511 </listitem>
512 </varlistentry>
513
514 <varlistentry id="gencat">
515 <term><command>gencat</command></term>
516 <listitem>
517 <para>Generates message catalogues</para>
518 <indexterm zone="ch-system-glibc gencat">
519 <primary sortas="b-gencat">gencat</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="getconf">
525 <term><command>getconf</command></term>
526 <listitem>
527 <para>Displays the system configuration values for file system
528 specific variables</para>
529 <indexterm zone="ch-system-glibc getconf">
530 <primary sortas="b-getconf">getconf</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="getent">
536 <term><command>getent</command></term>
537 <listitem>
538 <para>Gets entries from an administrative database</para>
539 <indexterm zone="ch-system-glibc getent">
540 <primary sortas="b-getent">getent</primary>
541 </indexterm>
542 </listitem>
543 </varlistentry>
544
545 <varlistentry id="iconv">
546 <term><command>iconv</command></term>
547 <listitem>
548 <para>Performs character set conversion</para>
549 <indexterm zone="ch-system-glibc iconv">
550 <primary sortas="b-iconv">iconv</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="iconvconfig">
556 <term><command>iconvconfig</command></term>
557 <listitem>
558 <para>Creates fastloading <command>iconv</command> module configuration
559 files</para>
560 <indexterm zone="ch-system-glibc iconvconfig">
561 <primary sortas="b-iconvconfig">iconvconfig</primary>
562 </indexterm>
563 </listitem>
564 </varlistentry>
565
566 <varlistentry id="ldconfig">
567 <term><command>ldconfig</command></term>
568 <listitem>
569 <para>Configures the dynamic linker runtime bindings</para>
570 <indexterm zone="ch-system-glibc ldconfig">
571 <primary sortas="b-ldconfig">ldconfig</primary>
572 </indexterm>
573 </listitem>
574 </varlistentry>
575
576 <varlistentry id="ldd">
577 <term><command>ldd</command></term>
578 <listitem>
579 <para>Reports which shared libraries are required
580 by each given program or shared library</para>
581 <indexterm zone="ch-system-glibc ldd">
582 <primary sortas="b-ldd">ldd</primary>
583 </indexterm>
584 </listitem>
585 </varlistentry>
586
587 <varlistentry id="lddlibc4">
588 <term><command>lddlibc4</command></term>
589 <listitem>
590 <para>Assists <command>ldd</command> with object files</para>
591 <indexterm zone="ch-system-glibc lddlibc4">
592 <primary sortas="b-lddlibc4">lddlibc4</primary>
593 </indexterm>
594 </listitem>
595 </varlistentry>
596
597 <varlistentry id="locale">
598 <term><command>locale</command></term>
599 <listitem>
600 <para>Prints various information about the current locale</para>
601 <indexterm zone="ch-system-glibc locale">
602 <primary sortas="b-locale">locale</primary>
603 </indexterm>
604 </listitem>
605 </varlistentry>
606
607 <varlistentry id="localedef">
608 <term><command>localedef</command></term>
609 <listitem>
610 <para>Compiles locale specifications</para>
611 <indexterm zone="ch-system-glibc localedef">
612 <primary sortas="b-localedef">localedef</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry>
616
617 <varlistentry id="mtrace">
618 <term><command>mtrace</command></term>
619 <listitem>
620 <para>Reads and interprets a memory trace file and displays a summary
621 in human-readable format</para>
622 <indexterm zone="ch-system-glibc mtrace">
623 <primary sortas="b-mtrace">mtrace</primary>
624 </indexterm>
625 </listitem>
626 </varlistentry>
627
628 <varlistentry id="nscd">
629 <term><command>nscd</command></term>
630 <listitem>
631 <para>A daemon that provides a cache for the most common name
632 service requests</para>
633 <indexterm zone="ch-system-glibc nscd">
634 <primary sortas="b-nscd">nscd</primary>
635 </indexterm>
636 </listitem>
637 </varlistentry>
638
639 <varlistentry id="pcprofiledump">
640 <term><command>pcprofiledump</command></term>
641 <listitem>
642 <para>Dumps information generated by PC profiling</para>
643 <indexterm zone="ch-system-glibc pcprofiledump">
644 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <varlistentry id="pt_chown">
650 <term><command>pt_chown</command></term>
651 <listitem>
652 <para>A helper program for <command>grantpt</command> to set the owner,
653 group and access permissions of a slave pseudo terminal</para>
654 <indexterm zone="ch-system-glibc pt_chown">
655 <primary sortas="b-pt_chown">pt_chown</primary>
656 </indexterm>
657 </listitem>
658 </varlistentry>
659
660 <varlistentry id="rpcgen">
661 <term><command>rpcgen</command></term>
662 <listitem>
663 <para>Generates C code to implement the Remote Procedure Call (RPC)
664 protocol</para>
665 <indexterm zone="ch-system-glibc rpcgen">
666 <primary sortas="b-rpcgen">rpcgen</primary>
667 </indexterm>
668 </listitem>
669 </varlistentry>
670
671 <varlistentry id="sln">
672 <term><command>sln</command></term>
673 <listitem>
674 <para>A statically linked <command>ln</command> program</para>
675 <indexterm zone="ch-system-glibc sln">
676 <primary sortas="b-sln">sln</primary>
677 </indexterm>
678 </listitem>
679 </varlistentry>
680
681 <varlistentry id="sotruss">
682 <term><command>sotruss</command></term>
683 <listitem>
684 <para>Traces shared library procedure calls of a specified command</para>
685 <indexterm zone="ch-system-glibc sotruss">
686 <primary sortas="b-sotruss">sotruss</primary>
687 </indexterm>
688 </listitem>
689 </varlistentry>
690
691 <varlistentry id="sprof">
692 <term><command>sprof</command></term>
693 <listitem>
694 <para>Reads and displays shared object profiling data</para>
695 <indexterm zone="ch-system-glibc sprof">
696 <primary sortas="b-sprof">sprof</primary>
697 </indexterm>
698 </listitem>
699 </varlistentry>
700
701 <varlistentry id="tzselect">
702 <term><command>tzselect</command></term>
703 <listitem>
704 <para>Asks the user about the location of the system and reports
705 the corresponding time zone description</para>
706 <indexterm zone="ch-system-glibc tzselect">
707 <primary sortas="b-tzselect">tzselect</primary>
708 </indexterm>
709 </listitem>
710 </varlistentry>
711
712 <varlistentry id="xtrace">
713 <term><command>xtrace</command></term>
714 <listitem>
715 <para>Traces the execution of a program by printing the currently
716 executed function</para>
717 <indexterm zone="ch-system-glibc xtrace">
718 <primary sortas="b-xtrace">xtrace</primary>
719 </indexterm>
720 </listitem>
721 </varlistentry>
722
723 <varlistentry id="zdump">
724 <term><command>zdump</command></term>
725 <listitem>
726 <para>The time zone dumper</para>
727 <indexterm zone="ch-system-glibc zdump">
728 <primary sortas="b-zdump">zdump</primary>
729 </indexterm>
730 </listitem>
731 </varlistentry>
732
733 <varlistentry id="zic">
734 <term><command>zic</command></term>
735 <listitem>
736 <para>The time zone compiler</para>
737 <indexterm zone="ch-system-glibc zic">
738 <primary sortas="b-zic">zic</primary>
739 </indexterm>
740 </listitem>
741 </varlistentry>
742
743 <varlistentry id="ld.so">
744 <term><filename class="libraryfile">ld.so</filename></term>
745 <listitem>
746 <para>The helper program for shared library executables</para>
747 <indexterm zone="ch-system-glibc ld.so">
748 <primary sortas="c-ld.so">ld.so</primary>
749 </indexterm>
750 </listitem>
751 </varlistentry>
752
753 <varlistentry id="libBrokenLocale">
754 <term><filename class="libraryfile">libBrokenLocale</filename></term>
755 <listitem>
756 <para>Used internally by Glibc as a gross hack to get broken programs
757 (e.g., some Motif applications) running. See comments in
758 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
759 for more information</para>
760 <indexterm zone="ch-system-glibc libBrokenLocale">
761 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
762 </indexterm>
763 </listitem>
764 </varlistentry>
765
766 <varlistentry id="libSegFault">
767 <term><filename class="libraryfile">libSegFault</filename></term>
768 <listitem>
769 <para>The segmentation fault signal handler, used by
770 <command>catchsegv</command></para>
771 <indexterm zone="ch-system-glibc libSegFault">
772 <primary sortas="c-libSegFault">libSegFault</primary>
773 </indexterm>
774 </listitem>
775 </varlistentry>
776
777 <varlistentry id="libanl">
778 <term><filename class="libraryfile">libanl</filename></term>
779 <listitem>
780 <para>An asynchronous name lookup library</para>
781 <indexterm zone="ch-system-glibc libanl">
782 <primary sortas="c-libanl">libanl</primary>
783 </indexterm>
784 </listitem>
785 </varlistentry>
786
787 <varlistentry id="libbsd-compat">
788 <term><filename class="libraryfile">libbsd-compat</filename></term>
789 <listitem>
790 <para>Provides the portability needed in order to run certain
791 Berkeley Software Distribution (BSD) programs under Linux</para>
792 <indexterm zone="ch-system-glibc libbsd-compat">
793 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
794 </indexterm>
795 </listitem>
796 </varlistentry>
797
798 <varlistentry id="libc">
799 <term><filename class="libraryfile">libc</filename></term>
800 <listitem>
801 <para>The main C library</para>
802 <indexterm zone="ch-system-glibc libc">
803 <primary sortas="c-libc">libc</primary>
804 </indexterm>
805 </listitem>
806 </varlistentry>
807
808 <varlistentry id="libcidn">
809 <term><filename class="libraryfile">libcidn</filename></term>
810 <listitem>
811 <para>Used internally by Glibc for handling internationalized domain
812 names in the <function>getaddrinfo()</function> function</para>
813 <indexterm zone="ch-system-glibc libcidn">
814 <primary sortas="c-libcidn">libcidn</primary>
815 </indexterm>
816 </listitem>
817 </varlistentry>
818
819 <varlistentry id="libcrypt">
820 <term><filename class="libraryfile">libcrypt</filename></term>
821 <listitem>
822 <para>The cryptography library</para>
823 <indexterm zone="ch-system-glibc libcrypt">
824 <primary sortas="c-libcrypt">libcrypt</primary>
825 </indexterm>
826 </listitem>
827 </varlistentry>
828
829 <varlistentry id="libdl">
830 <term><filename class="libraryfile">libdl</filename></term>
831 <listitem>
832 <para>The dynamic linking interface library</para>
833 <indexterm zone="ch-system-glibc libdl">
834 <primary sortas="c-libdl">libdl</primary>
835 </indexterm>
836 </listitem>
837 </varlistentry>
838
839 <varlistentry id="libg">
840 <term><filename class="libraryfile">libg</filename></term>
841 <listitem>
842 <para>Dummy library containing no functions. Previously was a runtime
843 library for <command>g++</command></para>
844 <indexterm zone="ch-system-glibc libg">
845 <primary sortas="c-libg">libg</primary>
846 </indexterm>
847 </listitem>
848 </varlistentry>
849
850 <varlistentry id="libieee">
851 <term><filename class="libraryfile">libieee</filename></term>
852 <listitem>
853 <para>Linking in this module forces error handling rules for math
854 functions as defined by the Institute of Electrical and Electronic
855 Engineers (IEEE). The default is POSIX.1 error handling</para>
856 <indexterm zone="ch-system-glibc libieee">
857 <primary sortas="c-libieee">libieee</primary>
858 </indexterm>
859 </listitem>
860 </varlistentry>
861
862 <varlistentry id="libm">
863 <term><filename class="libraryfile">libm</filename></term>
864 <listitem>
865 <para>The mathematical library</para>
866 <indexterm zone="ch-system-glibc libm">
867 <primary sortas="c-libm">libm</primary>
868 </indexterm>
869 </listitem>
870 </varlistentry>
871
872 <varlistentry id="libmcheck">
873 <term><filename class="libraryfile">libmcheck</filename></term>
874 <listitem>
875 <para>Turns on memory allocation checking when linked to</para>
876 <indexterm zone="ch-system-glibc libmcheck">
877 <primary sortas="c-libmcheck">libmcheck</primary>
878 </indexterm>
879 </listitem>
880 </varlistentry>
881
882 <varlistentry id="libmemusage">
883 <term><filename class="libraryfile">libmemusage</filename></term>
884 <listitem>
885 <para>Used by <command>memusage</command> to help collect
886 information about the memory usage of a program</para>
887 <indexterm zone="ch-system-glibc libmemusage">
888 <primary sortas="c-libmemusage">libmemusage</primary>
889 </indexterm>
890 </listitem>
891 </varlistentry>
892
893 <varlistentry id="libnsl">
894 <term><filename class="libraryfile">libnsl</filename></term>
895 <listitem>
896 <para>The network services library</para>
897 <indexterm zone="ch-system-glibc libnsl">
898 <primary sortas="c-libnsl">libnsl</primary>
899 </indexterm>
900 </listitem>
901 </varlistentry>
902
903 <varlistentry id="libnss">
904 <term><filename class="libraryfile">libnss</filename></term>
905 <listitem>
906 <para>The Name Service Switch libraries, containing functions for
907 resolving host names, user names, group names, aliases, services,
908 protocols, etc.</para>
909 <indexterm zone="ch-system-glibc libnss">
910 <primary sortas="c-libnss">libnss</primary>
911 </indexterm>
912 </listitem>
913 </varlistentry>
914
915 <varlistentry id="libpcprofile">
916 <term><filename class="libraryfile">libpcprofile</filename></term>
917 <listitem>
918 <para>Contains profiling functions used to track the amount of CPU
919 time spent in specific source code lines</para>
920 <indexterm zone="ch-system-glibc libpcprofile">
921 <primary sortas="c-libpcprofile">libpcprofile</primary>
922 </indexterm>
923 </listitem>
924 </varlistentry>
925
926 <varlistentry id="libpthread">
927 <term><filename class="libraryfile">libpthread</filename></term>
928 <listitem>
929 <para>The POSIX threads library</para>
930 <indexterm zone="ch-system-glibc libpthread">
931 <primary sortas="c-libpthread">libpthread</primary>
932 </indexterm>
933 </listitem>
934 </varlistentry>
935
936 <varlistentry id="libresolv">
937 <term><filename class="libraryfile">libresolv</filename></term>
938 <listitem>
939 <para>Contains functions for creating, sending, and interpreting
940 packets to the Internet domain name servers</para>
941 <indexterm zone="ch-system-glibc libresolv">
942 <primary sortas="c-libresolv">libresolv</primary>
943 </indexterm>
944 </listitem>
945 </varlistentry>
946
947 <varlistentry id="librpcsvc">
948 <term><filename class="libraryfile">librpcsvc</filename></term>
949 <listitem>
950 <para>Contains functions providing miscellaneous RPC services</para>
951 <indexterm zone="ch-system-glibc librpcsvc">
952 <primary sortas="c-librpcsvc">librpcsvc</primary>
953 </indexterm>
954 </listitem>
955 </varlistentry>
956
957 <varlistentry id="librt">
958 <term><filename class="libraryfile">librt</filename></term>
959 <listitem>
960 <para>Contains functions providing most of the interfaces specified
961 by the POSIX.1b Realtime Extension</para>
962 <indexterm zone="ch-system-glibc librt">
963 <primary sortas="c-librt">librt</primary>
964 </indexterm>
965 </listitem>
966 </varlistentry>
967
968 <varlistentry id="libthread_db">
969 <term><filename class="libraryfile">libthread_db</filename></term>
970 <listitem>
971 <para>Contains functions useful for building debuggers for
972 multi-threaded programs</para>
973 <indexterm zone="ch-system-glibc libthread_db">
974 <primary sortas="c-libthread_db">libthread_db</primary>
975 </indexterm>
976 </listitem>
977 </varlistentry>
978
979 <varlistentry id="libutil">
980 <term><filename class="libraryfile">libutil</filename></term>
981 <listitem>
982 <para>Contains code for <quote>standard</quote> functions used in
983 many different Unix utilities</para>
984 <indexterm zone="ch-system-glibc libutil">
985 <primary sortas="c-libutil">libutil</primary>
986 </indexterm>
987 </listitem>
988 </varlistentry>
989
990 </variablelist>
991
992 </sect2>
993
994</sect1>
Note: See TracBrowser for help on using the repository browser.