source: chapter06/glibc.xml@ 740ace6

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 740ace6 was 740ace6, checked in by Matthew Burgess <matthew@…>, 12 years ago

Add back a patch for Glibc that prevents various BLFS programs, including aplay, from segfaulting.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9843 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
  • Property mode set to 100644
File size: 35.4 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<!--
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>When running <command>make install</command>, a script called
76 <filename>test-installation.pl</filename> performs a small sanity test on
77 our newly installed Glibc. However, because our toolchain still points to
78 the <filename class="directory">/tools</filename> directory, the sanity
79 test would be carried out against the wrong Glibc. We can force the script
80 to check the Glibc we have just installed with the following:</para>
81
82<screen><userinput remap="pre">DL=$(readelf -l /bin/sh | sed -n 's@.*interpret.*/tools\(.*\)]$@\1@p')
83sed -i &quot;s|libs -o|libs -L/usr/lib -Wl,-dynamic-linker=$DL -o|&quot; \
84 scripts/test-installation.pl
85unset DL</userinput></screen>
86
87 <para>In addition, there is a bug in the
88 <filename>test-installation.pl</filename> script in that it tries to link
89 a test program to a library that isn't installed by
90 <command>make install</command>. Issue the following <command>sed</command>
91 command to fix it:</para>
92
93 <screen><userinput remap="pre">sed -i -e 's/"db1"/&amp; \&amp;\&amp; $name ne "nss_test1"/' scripts/test-installation.pl</userinput></screen>
94
95 <para>The <command>ldd</command> shell script contains Bash-specific
96 syntax. Change its default program interpreter to <command>/bin/bash</command>
97 in case another <command>/bin/sh</command> is installed as described in the
98 <ulink url="&blfs-root;view/svn/postlfs/shells.html">Shells</ulink>
99 chapter of the BLFS book:</para>
100
101<screen><userinput remap="pre">sed -i 's|@BASH@|/bin/bash|' elf/ldd.bash.in</userinput></screen>
102
103 <para>Fix a bug that causes several BLFS packages to segfault:</para>
104<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fixes-patch;</userinput></screen>
105
106 <para>Fix a bug that prevents Glibc from building with GCC-&gcc-version;:</para>
107<screen><userinput remap="pre">patch -Np1 -i ../&glibc-gcc_fix-patch;</userinput></screen>
108
109 <para>The Glibc documentation recommends building Glibc outside of the source
110 directory in a dedicated build directory:</para>
111
112<screen><userinput remap="pre">mkdir -v ../glibc-build
113cd ../glibc-build</userinput></screen>
114
115 <para>As in Chapter 5, add the needed compiler flags to CFLAGS for x86 machines.
116 Here, the optimization of the library is also set for the gcc compiler to
117 enhance compilation speed (-pipe) and package performance (-O3).</para>
118
119<screen><userinput remap="configure">case `uname -m` in
120 i?86) echo "CFLAGS += -march=i486 -mtune=native -O3 -pipe" &gt; configparms ;;
121esac</userinput></screen>
122
123 <para>Prepare Glibc for compilation:</para>
124
125<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
126 --prefix=/usr \
127 --disable-profile \
128 --enable-add-ons \
129 --enable-kernel=2.6.25 \
130 --libexecdir=/usr/lib/glibc</userinput></screen>
131
132 <variablelist>
133 <title>The meaning of the new configure options:</title>
134
135 <varlistentry>
136 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
137 <listitem>
138 <para>This changes the location of the <command>pt_chown</command>
139 program from its default of <filename
140 class="directory">/usr/libexec</filename> to <filename
141 class="directory">/usr/lib/glibc</filename>.</para>
142 </listitem>
143 </varlistentry>
144
145 </variablelist>
146
147 <para>Compile the package:</para>
148
149<screen><userinput remap="make">make</userinput></screen>
150
151 <important>
152 <para>In this section, the test suite for Glibc is considered critical.
153 Do not skip it under any circumstance.</para>
154 </important>
155
156 <para>Before running the tests, copy a file from the source tree into our
157 build tree to prevent a couple of test failures, then test the
158 results:</para>
159
160<screen><userinput remap="test">cp -v ../glibc-&glibc-version;/iconvdata/gconv-modules iconvdata
161make -k check 2&gt;&amp;1 | tee glibc-check-log
162grep Error glibc-check-log</userinput></screen>
163
164 <para>You will probably see an expected (ignored) failure in the
165 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
166 is somewhat dependent on the host system. This is a list of the most
167 common issues:</para>
168
169 <itemizedlist>
170 <!-- Check again after updating from gcc-4.1.x -->
171 <!-- Haven;t seen this in quite a while <listitem>
172 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
173 using the 4.1 series of GCC.</para>
174 </listitem> -->
175 <!-- Was true in glibc-2.3.6, rt/tst-cpuclock2 in glibc-2.11.1 -->
176 <listitem>
177
178 <para>The <emphasis>nptl/tst-clock2</emphasis>,
179 <emphasis>nptl/tst-attr3</emphasis>, and
180 <emphasis>rt/tst-cpuclock2</emphasis>
181 tests have been known to fail. The
182 reason is not completely understood, but indications are that minor
183 timing issues can trigger these failures.</para>
184
185 </listitem>
186 <listitem>
187 <para>The math tests sometimes fail when running on
188 systems where the CPU is not a relatively new genuine Intel or
189 authentic AMD processor.</para>
190 </listitem>
191 <listitem>
192 <para>If you have mounted the LFS partition with the
193 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
194 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
195 use the <parameter>noatime</parameter> option while building LFS.</para>
196 </listitem>
197 <listitem>
198 <para>When running on older and slower hardware or on systems under
199 load, some tests can fail because of test timeouts being exceeded.
200 Modifying the make check command to set a TIMEOUTFACTOR is reported to
201 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
202 make -k check</command>).</para>
203 </listitem>
204 <listitem>
205 <para>Other tests known to fail on some architectures are posix/bug-regex32,
206 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, and stdio-common/bug22.</para>
207 </listitem>
208 </itemizedlist>
209
210 <para>Though it is a harmless message, the install stage of Glibc will
211 complain about the absence of <filename>/etc/ld.so.conf</filename>.
212 Prevent this warning with:</para>
213
214<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
215
216 <para>Install the package:</para>
217
218<screen><userinput remap="install">make install</userinput></screen>
219
220 <para>Install NIS and RPC related headers that are not installed by
221 default; these are required by several BLFS packages:</para>
222
223<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/sunrpc/rpc/*.h /usr/include/rpc
224cp -v ../glibc-&glibc-version;/sunrpc/rpcsvc/*.h /usr/include/rpcsvc
225cp -v ../glibc-&glibc-version;/nis/rpcsvc/*.h /usr/include/rpcsvc</userinput></screen>
226
227 <para>The locales that can make the system respond in a different language
228 were not installed by the above command. None of the locales are required,
229 but if some of them are missing, test suites of the future packages would
230 skip important testcases.</para>
231
232 <para>Individual locales can be installed using the
233 <command>localedef</command> program. E.g., the first
234 <command>localedef</command> command below combines the
235 <filename>/usr/share/i18n/locales/cs_CZ</filename>
236 charset-independent locale definition with the
237 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
238 charmap definition and appends the result to the
239 <filename>/usr/lib/locale/locale-archive</filename> file.
240 The following instructions will install the minimum set of
241 locales necessary for the optimal coverage of tests:</para>
242
243<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
244localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
245localedef -i de_DE -f ISO-8859-1 de_DE
246localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
247localedef -i de_DE -f UTF-8 de_DE.UTF-8
248localedef -i en_HK -f ISO-8859-1 en_HK
249localedef -i en_PH -f ISO-8859-1 en_PH
250localedef -i en_US -f ISO-8859-1 en_US
251localedef -i en_US -f UTF-8 en_US.UTF-8
252localedef -i es_MX -f ISO-8859-1 es_MX
253localedef -i fa_IR -f UTF-8 fa_IR
254localedef -i fr_FR -f ISO-8859-1 fr_FR
255localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
256localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
257localedef -i it_IT -f ISO-8859-1 it_IT
258localedef -i ja_JP -f EUC-JP ja_JP
259localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
260localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
261
262 <para>In addition, install the locale for your own country, language and
263 character set.</para>
264
265 <para>Alternatively, install all locales listed in the
266 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
267 (it includes every locale listed above and many more) at once with the
268 following time-consuming command:</para>
269
270<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
271
272 <para>Then use the <command>localedef</command> command to create and
273 install locales not listed in the
274 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
275 in the unlikely case you need them.</para>
276 <!-- The Live CD patches the localedata/SUPPORTED file instead of
277 running localedef, the results are equivalent -->
278
279 </sect2>
280
281 <sect2 id="conf-glibc" role="configuration">
282 <title>Configuring Glibc</title>
283
284 <indexterm zone="conf-glibc">
285 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
286 </indexterm>
287
288 <indexterm zone="conf-glibc">
289 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
290 </indexterm>
291
292 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
293 because, although Glibc provides defaults when this file is missing or corrupt,
294 the Glibc defaults do not work well in a networked environment. The time zone
295 also needs to be configured.</para>
296
297 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
298 following:</para>
299
300<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
301<literal># Begin /etc/nsswitch.conf
302
303passwd: files
304group: files
305shadow: files
306
307hosts: files dns
308networks: files
309
310protocols: files
311services: files
312ethers: files
313rpc: files
314
315# End /etc/nsswitch.conf</literal>
316EOF</userinput></screen>
317
318 <para>One way to determine the local time zone, run the following
319 script:</para>
320
321<screen role="nodump"><userinput>tzselect</userinput></screen>
322
323 <para>After answering a few questions about the location, the script will
324 output the name of the time zone (e.g.,
325 <emphasis>America/Edmonton</emphasis>). There are also some other possible
326 timezones listed in <filename
327 class='directory'>/usr/share/zoneinfo</filename> such as
328 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
329 are not identified by the script but can be used.</para>
330
331 <para>Then create the <filename>/etc/localtime</filename> file by
332 running:</para>
333
334<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
335 /etc/localtime</userinput></screen>
336
337 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
338 time zone selected (e.g., Canada/Eastern).</para>
339
340 <variablelist>
341 <title>The meaning of the cp option:</title>
342
343 <varlistentry>
344 <term><parameter>--remove-destination</parameter></term>
345 <listitem>
346 <para>This is needed to force removal of the already existing symbolic
347 link. The reason for copying the file instead of using a symlink is to
348 cover the situation where <filename class="directory">/usr</filename>
349 is on a separate partition. This could be important when booted into
350 single user mode.</para>
351 </listitem>
352 </varlistentry>
353
354 </variablelist>
355
356 </sect2>
357
358 <sect2 id="conf-ld" role="configuration">
359 <title>Configuring the Dynamic Loader</title>
360
361 <indexterm zone="conf-ld">
362 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
363 </indexterm>
364
365 <para>By default, the dynamic loader (<filename
366 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
367 <filename class="directory">/lib</filename> and <filename
368 class="directory">/usr/lib</filename> for dynamic libraries that are
369 needed by programs as they are run. However, if there are libraries in
370 directories other than <filename class="directory">/lib</filename> and
371 <filename class="directory">/usr/lib</filename>, these need to be added
372 to the <filename>/etc/ld.so.conf</filename> file in order for the
373 dynamic loader to find them. Two directories that are commonly known
374 to contain additional libraries are <filename
375 class="directory">/usr/local/lib</filename> and <filename
376 class="directory">/opt/lib</filename>, so add those directories to the
377 dynamic loader's search path.</para>
378
379 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
380 following:</para>
381
382<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
383<literal># Begin /etc/ld.so.conf
384/usr/local/lib
385/opt/lib
386</literal>
387EOF</userinput></screen>
388
389 <para>If desired, the dynamic loader can also search a directory and
390 include the contents of files found there. Generally the files in
391 this include directory are one line specifying the desired library path.
392 To add this capability run the following commands:</para>
393
394<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
395<literal># Add an include directory
396include /etc/ld.so.conf.d/*.conf
397</literal>
398EOF
399mkdir /etc/ld.so.conf.d</userinput></screen>
400
401 </sect2>
402
403 <sect2 id="contents-glibc" role="content">
404 <title>Contents of Glibc</title>
405
406 <segmentedlist>
407 <segtitle>Installed programs</segtitle>
408 <segtitle>Installed libraries</segtitle>
409 <segtitle>Installed directories</segtitle>
410
411 <seglistitem>
412 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
413 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
414 pt_chown, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
415 zdump, and zic</seg>
416 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
417 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
418 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
419 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
420 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
421 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
422 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
423 libthread_db.so, and libutil.{a,so}</seg>
424 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
425 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
426 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
427 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
428 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
429 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
430 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/glibc,
431 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo</seg>
432 </seglistitem>
433 </segmentedlist>
434
435 <variablelist>
436 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
437 <?dbfo list-presentation="list"?>
438 <?dbhtml list-presentation="table"?>
439
440 <varlistentry id="catchsegv">
441 <term><command>catchsegv</command></term>
442 <listitem>
443 <para>Can be used to create a stack trace when a program
444 terminates with a segmentation fault</para>
445 <indexterm zone="ch-system-glibc catchsegv">
446 <primary sortas="b-catchsegv">catchsegv</primary>
447 </indexterm>
448 </listitem>
449 </varlistentry>
450
451 <varlistentry id="gencat">
452 <term><command>gencat</command></term>
453 <listitem>
454 <para>Generates message catalogues</para>
455 <indexterm zone="ch-system-glibc gencat">
456 <primary sortas="b-gencat">gencat</primary>
457 </indexterm>
458 </listitem>
459 </varlistentry>
460
461 <varlistentry id="getconf">
462 <term><command>getconf</command></term>
463 <listitem>
464 <para>Displays the system configuration values for file system
465 specific variables</para>
466 <indexterm zone="ch-system-glibc getconf">
467 <primary sortas="b-getconf">getconf</primary>
468 </indexterm>
469 </listitem>
470 </varlistentry>
471
472 <varlistentry id="getent">
473 <term><command>getent</command></term>
474 <listitem>
475 <para>Gets entries from an administrative database</para>
476 <indexterm zone="ch-system-glibc getent">
477 <primary sortas="b-getent">getent</primary>
478 </indexterm>
479 </listitem>
480 </varlistentry>
481
482 <varlistentry id="iconv">
483 <term><command>iconv</command></term>
484 <listitem>
485 <para>Performs character set conversion</para>
486 <indexterm zone="ch-system-glibc iconv">
487 <primary sortas="b-iconv">iconv</primary>
488 </indexterm>
489 </listitem>
490 </varlistentry>
491
492 <varlistentry id="iconvconfig">
493 <term><command>iconvconfig</command></term>
494 <listitem>
495 <para>Creates fastloading <command>iconv</command> module configuration
496 files</para>
497 <indexterm zone="ch-system-glibc iconvconfig">
498 <primary sortas="b-iconvconfig">iconvconfig</primary>
499 </indexterm>
500 </listitem>
501 </varlistentry>
502
503 <varlistentry id="ldconfig">
504 <term><command>ldconfig</command></term>
505 <listitem>
506 <para>Configures the dynamic linker runtime bindings</para>
507 <indexterm zone="ch-system-glibc ldconfig">
508 <primary sortas="b-ldconfig">ldconfig</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="ldd">
514 <term><command>ldd</command></term>
515 <listitem>
516 <para>Reports which shared libraries are required
517 by each given program or shared library</para>
518 <indexterm zone="ch-system-glibc ldd">
519 <primary sortas="b-ldd">ldd</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="lddlibc4">
525 <term><command>lddlibc4</command></term>
526 <listitem>
527 <para>Assists <command>ldd</command> with object files</para>
528 <indexterm zone="ch-system-glibc lddlibc4">
529 <primary sortas="b-lddlibc4">lddlibc4</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="locale">
535 <term><command>locale</command></term>
536 <listitem>
537 <para>Prints various information about the current locale</para>
538 <indexterm zone="ch-system-glibc locale">
539 <primary sortas="b-locale">locale</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="localedef">
545 <term><command>localedef</command></term>
546 <listitem>
547 <para>Compiles locale specifications</para>
548 <indexterm zone="ch-system-glibc localedef">
549 <primary sortas="b-localedef">localedef</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="mtrace">
555 <term><command>mtrace</command></term>
556 <listitem>
557 <para>Reads and interprets a memory trace file and displays a summary
558 in human-readable format</para>
559 <indexterm zone="ch-system-glibc mtrace">
560 <primary sortas="b-mtrace">mtrace</primary>
561 </indexterm>
562 </listitem>
563 </varlistentry>
564
565 <varlistentry id="nscd">
566 <term><command>nscd</command></term>
567 <listitem>
568 <para>A daemon that provides a cache for the most common name
569 service requests</para>
570 <indexterm zone="ch-system-glibc nscd">
571 <primary sortas="b-nscd">nscd</primary>
572 </indexterm>
573 </listitem>
574 </varlistentry>
575
576 <varlistentry id="pcprofiledump">
577 <term><command>pcprofiledump</command></term>
578 <listitem>
579 <para>Dumps information generated by PC profiling</para>
580 <indexterm zone="ch-system-glibc pcprofiledump">
581 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
582 </indexterm>
583 </listitem>
584 </varlistentry>
585
586 <varlistentry id="pt_chown">
587 <term><command>pt_chown</command></term>
588 <listitem>
589 <para>A helper program for <command>grantpt</command> to set the owner,
590 group and access permissions of a slave pseudo terminal</para>
591 <indexterm zone="ch-system-glibc pt_chown">
592 <primary sortas="b-pt_chown">pt_chown</primary>
593 </indexterm>
594 </listitem>
595 </varlistentry>
596
597 <varlistentry id="rpcgen">
598 <term><command>rpcgen</command></term>
599 <listitem>
600 <para>Generates C code to implement the Remote Procedure Call (RPC)
601 protocol</para>
602 <indexterm zone="ch-system-glibc rpcgen">
603 <primary sortas="b-rpcgen">rpcgen</primary>
604 </indexterm>
605 </listitem>
606 </varlistentry>
607
608 <varlistentry id="sln">
609 <term><command>sln</command></term>
610 <listitem>
611 <para>A statically linked <command>ln</command> program</para>
612 <indexterm zone="ch-system-glibc sln">
613 <primary sortas="b-sln">sln</primary>
614 </indexterm>
615 </listitem>
616 </varlistentry>
617
618 <varlistentry id="sotruss">
619 <term><command>sotruss</command></term>
620 <listitem>
621 <para>Traces shared library procedure calls of a specified command</para>
622 <indexterm zone="ch-system-glibc sotruss">
623 <primary sortas="b-sotruss">sotruss</primary>
624 </indexterm>
625 </listitem>
626 </varlistentry>
627
628 <varlistentry id="sprof">
629 <term><command>sprof</command></term>
630 <listitem>
631 <para>Reads and displays shared object profiling data</para>
632 <indexterm zone="ch-system-glibc sprof">
633 <primary sortas="b-sprof">sprof</primary>
634 </indexterm>
635 </listitem>
636 </varlistentry>
637
638 <varlistentry id="tzselect">
639 <term><command>tzselect</command></term>
640 <listitem>
641 <para>Asks the user about the location of the system and reports
642 the corresponding time zone description</para>
643 <indexterm zone="ch-system-glibc tzselect">
644 <primary sortas="b-tzselect">tzselect</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <varlistentry id="xtrace">
650 <term><command>xtrace</command></term>
651 <listitem>
652 <para>Traces the execution of a program by printing the currently
653 executed function</para>
654 <indexterm zone="ch-system-glibc xtrace">
655 <primary sortas="b-xtrace">xtrace</primary>
656 </indexterm>
657 </listitem>
658 </varlistentry>
659
660 <varlistentry id="zdump">
661 <term><command>zdump</command></term>
662 <listitem>
663 <para>The time zone dumper</para>
664 <indexterm zone="ch-system-glibc zdump">
665 <primary sortas="b-zdump">zdump</primary>
666 </indexterm>
667 </listitem>
668 </varlistentry>
669
670 <varlistentry id="zic">
671 <term><command>zic</command></term>
672 <listitem>
673 <para>The time zone compiler</para>
674 <indexterm zone="ch-system-glibc zic">
675 <primary sortas="b-zic">zic</primary>
676 </indexterm>
677 </listitem>
678 </varlistentry>
679
680 <varlistentry id="ld.so">
681 <term><filename class="libraryfile">ld.so</filename></term>
682 <listitem>
683 <para>The helper program for shared library executables</para>
684 <indexterm zone="ch-system-glibc ld.so">
685 <primary sortas="c-ld.so">ld.so</primary>
686 </indexterm>
687 </listitem>
688 </varlistentry>
689
690 <varlistentry id="libBrokenLocale">
691 <term><filename class="libraryfile">libBrokenLocale</filename></term>
692 <listitem>
693 <para>Used internally by Glibc as a gross hack to get broken programs
694 (e.g., some Motif applications) running. See comments in
695 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
696 for more information</para>
697 <indexterm zone="ch-system-glibc libBrokenLocale">
698 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
699 </indexterm>
700 </listitem>
701 </varlistentry>
702
703 <varlistentry id="libSegFault">
704 <term><filename class="libraryfile">libSegFault</filename></term>
705 <listitem>
706 <para>The segmentation fault signal handler, used by
707 <command>catchsegv</command></para>
708 <indexterm zone="ch-system-glibc libSegFault">
709 <primary sortas="c-libSegFault">libSegFault</primary>
710 </indexterm>
711 </listitem>
712 </varlistentry>
713
714 <varlistentry id="libanl">
715 <term><filename class="libraryfile">libanl</filename></term>
716 <listitem>
717 <para>An asynchronous name lookup library</para>
718 <indexterm zone="ch-system-glibc libanl">
719 <primary sortas="c-libanl">libanl</primary>
720 </indexterm>
721 </listitem>
722 </varlistentry>
723
724 <varlistentry id="libbsd-compat">
725 <term><filename class="libraryfile">libbsd-compat</filename></term>
726 <listitem>
727 <para>Provides the portability needed in order to run certain
728 Berkeley Software Distribution (BSD) programs under Linux</para>
729 <indexterm zone="ch-system-glibc libbsd-compat">
730 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
731 </indexterm>
732 </listitem>
733 </varlistentry>
734
735 <varlistentry id="libc">
736 <term><filename class="libraryfile">libc</filename></term>
737 <listitem>
738 <para>The main C library</para>
739 <indexterm zone="ch-system-glibc libc">
740 <primary sortas="c-libc">libc</primary>
741 </indexterm>
742 </listitem>
743 </varlistentry>
744
745 <varlistentry id="libcidn">
746 <term><filename class="libraryfile">libcidn</filename></term>
747 <listitem>
748 <para>Used internally by Glibc for handling internationalized domain
749 names in the <function>getaddrinfo()</function> function</para>
750 <indexterm zone="ch-system-glibc libcidn">
751 <primary sortas="c-libcidn">libcidn</primary>
752 </indexterm>
753 </listitem>
754 </varlistentry>
755
756 <varlistentry id="libcrypt">
757 <term><filename class="libraryfile">libcrypt</filename></term>
758 <listitem>
759 <para>The cryptography library</para>
760 <indexterm zone="ch-system-glibc libcrypt">
761 <primary sortas="c-libcrypt">libcrypt</primary>
762 </indexterm>
763 </listitem>
764 </varlistentry>
765
766 <varlistentry id="libdl">
767 <term><filename class="libraryfile">libdl</filename></term>
768 <listitem>
769 <para>The dynamic linking interface library</para>
770 <indexterm zone="ch-system-glibc libdl">
771 <primary sortas="c-libdl">libdl</primary>
772 </indexterm>
773 </listitem>
774 </varlistentry>
775
776 <varlistentry id="libg">
777 <term><filename class="libraryfile">libg</filename></term>
778 <listitem>
779 <para>Dummy library containing no functions. Previously was a runtime
780 library for <command>g++</command></para>
781 <indexterm zone="ch-system-glibc libg">
782 <primary sortas="c-libg">libg</primary>
783 </indexterm>
784 </listitem>
785 </varlistentry>
786
787 <varlistentry id="libieee">
788 <term><filename class="libraryfile">libieee</filename></term>
789 <listitem>
790 <para>Linking in this module forces error handling rules for math
791 functions as defined by the Institute of Electrical and Electronic
792 Engineers (IEEE). The default is POSIX.1 error handling</para>
793 <indexterm zone="ch-system-glibc libieee">
794 <primary sortas="c-libieee">libieee</primary>
795 </indexterm>
796 </listitem>
797 </varlistentry>
798
799 <varlistentry id="libm">
800 <term><filename class="libraryfile">libm</filename></term>
801 <listitem>
802 <para>The mathematical library</para>
803 <indexterm zone="ch-system-glibc libm">
804 <primary sortas="c-libm">libm</primary>
805 </indexterm>
806 </listitem>
807 </varlistentry>
808
809 <varlistentry id="libmcheck">
810 <term><filename class="libraryfile">libmcheck</filename></term>
811 <listitem>
812 <para>Turns on memory allocation checking when linked to</para>
813 <indexterm zone="ch-system-glibc libmcheck">
814 <primary sortas="c-libmcheck">libmcheck</primary>
815 </indexterm>
816 </listitem>
817 </varlistentry>
818
819 <varlistentry id="libmemusage">
820 <term><filename class="libraryfile">libmemusage</filename></term>
821 <listitem>
822 <para>Used by <command>memusage</command> to help collect
823 information about the memory usage of a program</para>
824 <indexterm zone="ch-system-glibc libmemusage">
825 <primary sortas="c-libmemusage">libmemusage</primary>
826 </indexterm>
827 </listitem>
828 </varlistentry>
829
830 <varlistentry id="libnsl">
831 <term><filename class="libraryfile">libnsl</filename></term>
832 <listitem>
833 <para>The network services library</para>
834 <indexterm zone="ch-system-glibc libnsl">
835 <primary sortas="c-libnsl">libnsl</primary>
836 </indexterm>
837 </listitem>
838 </varlistentry>
839
840 <varlistentry id="libnss">
841 <term><filename class="libraryfile">libnss</filename></term>
842 <listitem>
843 <para>The Name Service Switch libraries, containing functions for
844 resolving host names, user names, group names, aliases, services,
845 protocols, etc.</para>
846 <indexterm zone="ch-system-glibc libnss">
847 <primary sortas="c-libnss">libnss</primary>
848 </indexterm>
849 </listitem>
850 </varlistentry>
851
852 <varlistentry id="libpcprofile">
853 <term><filename class="libraryfile">libpcprofile</filename></term>
854 <listitem>
855 <para>Contains profiling functions used to track the amount of CPU
856 time spent in specific source code lines</para>
857 <indexterm zone="ch-system-glibc libpcprofile">
858 <primary sortas="c-libpcprofile">libpcprofile</primary>
859 </indexterm>
860 </listitem>
861 </varlistentry>
862
863 <varlistentry id="libpthread">
864 <term><filename class="libraryfile">libpthread</filename></term>
865 <listitem>
866 <para>The POSIX threads library</para>
867 <indexterm zone="ch-system-glibc libpthread">
868 <primary sortas="c-libpthread">libpthread</primary>
869 </indexterm>
870 </listitem>
871 </varlistentry>
872
873 <varlistentry id="libresolv">
874 <term><filename class="libraryfile">libresolv</filename></term>
875 <listitem>
876 <para>Contains functions for creating, sending, and interpreting
877 packets to the Internet domain name servers</para>
878 <indexterm zone="ch-system-glibc libresolv">
879 <primary sortas="c-libresolv">libresolv</primary>
880 </indexterm>
881 </listitem>
882 </varlistentry>
883
884 <varlistentry id="librpcsvc">
885 <term><filename class="libraryfile">librpcsvc</filename></term>
886 <listitem>
887 <para>Contains functions providing miscellaneous RPC services</para>
888 <indexterm zone="ch-system-glibc librpcsvc">
889 <primary sortas="c-librpcsvc">librpcsvc</primary>
890 </indexterm>
891 </listitem>
892 </varlistentry>
893
894 <varlistentry id="librt">
895 <term><filename class="libraryfile">librt</filename></term>
896 <listitem>
897 <para>Contains functions providing most of the interfaces specified
898 by the POSIX.1b Realtime Extension</para>
899 <indexterm zone="ch-system-glibc librt">
900 <primary sortas="c-librt">librt</primary>
901 </indexterm>
902 </listitem>
903 </varlistentry>
904
905 <varlistentry id="libthread_db">
906 <term><filename class="libraryfile">libthread_db</filename></term>
907 <listitem>
908 <para>Contains functions useful for building debuggers for
909 multi-threaded programs</para>
910 <indexterm zone="ch-system-glibc libthread_db">
911 <primary sortas="c-libthread_db">libthread_db</primary>
912 </indexterm>
913 </listitem>
914 </varlistentry>
915
916 <varlistentry id="libutil">
917 <term><filename class="libraryfile">libutil</filename></term>
918 <listitem>
919 <para>Contains code for <quote>standard</quote> functions used in
920 many different Unix utilities</para>
921 <indexterm zone="ch-system-glibc libutil">
922 <primary sortas="c-libutil">libutil</primary>
923 </indexterm>
924 </listitem>
925 </varlistentry>
926
927 </variablelist>
928
929 </sect2>
930
931</sect1>
Note: See TracBrowser for help on using the repository browser.