source: chapter06/glibc.xml@ 6d6a2f0

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 6d6a2f0 was 6d6a2f0, checked in by Bruce Dubbs <bdubbs@…>, 12 years ago

Add a patch for glibc that fixes a segfault's dlopen

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9755 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
  • Property mode set to 100644
File size: 35.7 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 couple of bugs in Glibc that can cause crashes and core dumps:</para>
104
105<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fixes-patch;
106patch -Np1 -i ../&glibc-sort-patch;</userinput></screen>
107
108 <para>Fix a bug that prevents Glibc from building with GCC-&gcc-version;:</para>
109
110<screen><userinput remap="pre">patch -Np1 -i ../&glibc-gcc_fix-patch;</userinput></screen>
111
112 <para>Fix a stack imbalance that occurs under some conditions:</para>
113
114<screen><userinput remap="pre">sed -i '195,213 s/PRIVATE_FUTEX/FUTEX_CLOCK_REALTIME/' \
115nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timed{rd,wr}lock.S</userinput></screen>
116
117 <para>The Glibc documentation recommends building Glibc outside of the source
118 directory in a dedicated build directory:</para>
119
120<screen><userinput remap="pre">mkdir -v ../glibc-build
121cd ../glibc-build</userinput></screen>
122
123 <para>As in Chapter 5, add the needed compiler flags to CFLAGS for x86 machines.
124 Here, the optimization of the library is also set for the gcc compiler to
125 enhance compilation speed (-pipe) and package performance (-O3).</para>
126
127<screen><userinput remap="configure">case `uname -m` in
128 i?86) echo "CFLAGS += -march=i486 -mtune=native -O3 -pipe" &gt; configparms ;;
129esac</userinput></screen>
130
131 <para>Prepare Glibc for compilation:</para>
132
133<screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/usr \
134 --disable-profile --enable-add-ons \
135 --enable-kernel=2.6.25 --libexecdir=/usr/lib/glibc</userinput></screen>
136
137 <variablelist>
138 <title>The meaning of the new configure options:</title>
139
140 <varlistentry>
141 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
142 <listitem>
143 <para>This changes the location of the <command>pt_chown</command>
144 program from its default of <filename
145 class="directory">/usr/libexec</filename> to <filename
146 class="directory">/usr/lib/glibc</filename>.</para>
147 </listitem>
148 </varlistentry>
149
150 </variablelist>
151
152 <para>Compile the package:</para>
153
154<screen><userinput remap="make">make</userinput></screen>
155
156 <important>
157 <para>In this section, the test suite for Glibc is considered critical.
158 Do not skip it under any circumstance.</para>
159 </important>
160
161 <para>Before running the tests, copy a file from the source tree into our
162 build tree to prevent a couple of test failures, then test the
163 results:</para>
164
165<screen><userinput remap="test">cp -v ../glibc-&glibc-version;/iconvdata/gconv-modules iconvdata
166make -k check 2&gt;&amp;1 | tee glibc-check-log
167grep Error glibc-check-log</userinput></screen>
168
169 <para>You will probably see an expected (ignored) failure in the
170 <emphasis>posix/annexc</emphasis> test. In addition the Glibc test suite
171 is somewhat dependent on the host system. This is a list of the most
172 common issues:</para>
173
174 <itemizedlist>
175 <!-- Check again after updating from gcc-4.1.x -->
176 <!-- Haven;t seen this in quite a while <listitem>
177 <para>The <emphasis>nptl/tst-cancel1</emphasis> test will fail when
178 using the 4.1 series of GCC.</para>
179 </listitem> -->
180 <!-- Was true in glibc-2.3.6, rt/tst-cpuclock2 in glibc-2.11.1 -->
181 <listitem>
182
183 <para>The <emphasis>nptl/tst-clock2</emphasis>,
184 <emphasis>nptl/tst-attr3</emphasis>, and
185 <emphasis>rt/tst-cpuclock2</emphasis>
186 tests have been known to fail. The
187 reason is not completely understood, but indications are that minor
188 timing issues can trigger these failures.</para>
189
190 </listitem>
191 <listitem>
192 <para>The math tests sometimes fail when running on
193 systems where the CPU is not a relatively new genuine Intel or
194 authentic AMD processor.</para>
195 </listitem>
196 <listitem>
197 <para>If you have mounted the LFS partition with the
198 <parameter>noatime</parameter> option, the <emphasis>atime</emphasis>
199 test will fail. As mentioned in <xref linkend="space-mounting"/>, do not
200 use the <parameter>noatime</parameter> option while building LFS.</para>
201 </listitem>
202 <listitem>
203 <para>When running on older and slower hardware or on systems under
204 load, some tests can fail because of test timeouts being exceeded.
205 Modifying the make check command to set a TIMEOUTFACTOR is reported to
206 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
207 make -k check</command>).</para>
208 </listitem>
209 <listitem>
210 <para>Other tests known to fail on some architectures are posix/bug-regex32,
211 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, and stdio-common/bug22.</para>
212 </listitem>
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 by several BLFS packages:</para>
227
228<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/sunrpc/rpc/*.h /usr/include/rpc
229cp -v ../glibc-&glibc-version;/sunrpc/rpcsvc/*.h /usr/include/rpcsvc
230cp -v ../glibc-&glibc-version;/nis/rpcsvc/*.h /usr/include/rpcsvc</userinput></screen>
231
232 <para>The locales that can make the system respond in a different language
233 were not installed by the above command. None of the locales are required,
234 but if some of them are missing, test suites of the future packages would
235 skip important testcases.</para>
236
237 <para>Individual locales can be installed using the
238 <command>localedef</command> program. E.g., the first
239 <command>localedef</command> command below combines the
240 <filename>/usr/share/i18n/locales/cs_CZ</filename>
241 charset-independent locale definition with the
242 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
243 charmap definition and appends the result to the
244 <filename>/usr/lib/locale/locale-archive</filename> file.
245 The following instructions will install the minimum set of
246 locales necessary for the optimal coverage of tests:</para>
247
248<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
249localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
250localedef -i de_DE -f ISO-8859-1 de_DE
251localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
252localedef -i de_DE -f UTF-8 de_DE.UTF-8
253localedef -i en_HK -f ISO-8859-1 en_HK
254localedef -i en_PH -f ISO-8859-1 en_PH
255localedef -i en_US -f ISO-8859-1 en_US
256localedef -i en_US -f UTF-8 en_US.UTF-8
257localedef -i es_MX -f ISO-8859-1 es_MX
258localedef -i fa_IR -f UTF-8 fa_IR
259localedef -i fr_FR -f ISO-8859-1 fr_FR
260localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
261localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
262localedef -i it_IT -f ISO-8859-1 it_IT
263localedef -i ja_JP -f EUC-JP ja_JP
264localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
265localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
266
267 <para>In addition, install the locale for your own country, language and
268 character set.</para>
269
270 <para>Alternatively, install all locales listed in the
271 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
272 (it includes every locale listed above and many more) at once with the
273 following time-consuming command:</para>
274
275<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
276
277 <para>Then use the <command>localedef</command> command to create and
278 install locales not listed in the
279 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
280 in the unlikely case you need them.</para>
281 <!-- The Live CD patches the localedata/SUPPORTED file instead of
282 running localedef, the results are equivalent -->
283
284 </sect2>
285
286 <sect2 id="conf-glibc" role="configuration">
287 <title>Configuring Glibc</title>
288
289 <indexterm zone="conf-glibc">
290 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
291 </indexterm>
292
293 <indexterm zone="conf-glibc">
294 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
295 </indexterm>
296
297 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
298 because, although Glibc provides defaults when this file is missing or corrupt,
299 the Glibc defaults do not work well in a networked environment. The time zone
300 also needs to be configured.</para>
301
302 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
303 following:</para>
304
305<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
306<literal># Begin /etc/nsswitch.conf
307
308passwd: files
309group: files
310shadow: files
311
312hosts: files dns
313networks: files
314
315protocols: files
316services: files
317ethers: files
318rpc: files
319
320# End /etc/nsswitch.conf</literal>
321EOF</userinput></screen>
322
323 <para>One way to determine the local time zone, run the following
324 script:</para>
325
326<screen role="nodump"><userinput>tzselect</userinput></screen>
327
328 <para>After answering a few questions about the location, the script will
329 output the name of the time zone (e.g.,
330 <emphasis>America/Edmonton</emphasis>). There are also some other possible
331 timezones listed in <filename
332 class='directory'>/usr/share/zoneinfo</filename> such as
333 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
334 are not identified by the script but can be used.</para>
335
336 <para>Then create the <filename>/etc/localtime</filename> file by
337 running:</para>
338
339<screen><userinput>cp -v --remove-destination /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> \
340 /etc/localtime</userinput></screen>
341
342 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
343 time zone selected (e.g., Canada/Eastern).</para>
344
345 <variablelist>
346 <title>The meaning of the cp option:</title>
347
348 <varlistentry>
349 <term><parameter>--remove-destination</parameter></term>
350 <listitem>
351 <para>This is needed to force removal of the already existing symbolic
352 link. The reason for copying the file instead of using a symlink is to
353 cover the situation where <filename class="directory">/usr</filename>
354 is on a separate partition. This could be important when booted into
355 single user mode.</para>
356 </listitem>
357 </varlistentry>
358
359 </variablelist>
360
361 </sect2>
362
363 <sect2 id="conf-ld" role="configuration">
364 <title>Configuring the Dynamic Loader</title>
365
366 <indexterm zone="conf-ld">
367 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
368 </indexterm>
369
370 <para>By default, the dynamic loader (<filename
371 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
372 <filename class="directory">/lib</filename> and <filename
373 class="directory">/usr/lib</filename> for dynamic libraries that are
374 needed by programs as they are run. However, if there are libraries in
375 directories other than <filename class="directory">/lib</filename> and
376 <filename class="directory">/usr/lib</filename>, these need to be added
377 to the <filename>/etc/ld.so.conf</filename> file in order for the
378 dynamic loader to find them. Two directories that are commonly known
379 to contain additional libraries are <filename
380 class="directory">/usr/local/lib</filename> and <filename
381 class="directory">/opt/lib</filename>, so add those directories to the
382 dynamic loader's search path.</para>
383
384 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
385 following:</para>
386
387<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
388<literal># Begin /etc/ld.so.conf
389/usr/local/lib
390/opt/lib
391</literal>
392EOF</userinput></screen>
393
394 <para>If desired, the dynamic loader can also search a directory and
395 include the contents of files found there. Generally the files in
396 this include directory are one line specifying the desired library path.
397 To add this capability run the following commands:</para>
398
399<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
400<literal># Add an include directory
401include /etc/ld.so.conf.d/*.conf
402</literal>
403EOF
404mkdir /etc/ld.so.conf.d</userinput></screen>
405
406 </sect2>
407
408 <sect2 id="contents-glibc" role="content">
409 <title>Contents of Glibc</title>
410
411 <segmentedlist>
412 <segtitle>Installed programs</segtitle>
413 <segtitle>Installed libraries</segtitle>
414 <segtitle>Installed directories</segtitle>
415
416 <seglistitem>
417 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
418 ldd, lddlibc4, locale, localedef, mtrace, nscd, pcprofiledump,
419 pt_chown, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
420 zdump, and zic</seg>
421 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
422 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
423 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
424 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
425 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
426 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
427 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
428 libthread_db.so, and libutil.{a,so}</seg>
429 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
430 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
431 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
432 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
433 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
434 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
435 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/glibc,
436 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo</seg>
437 </seglistitem>
438 </segmentedlist>
439
440 <variablelist>
441 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
442 <?dbfo list-presentation="list"?>
443 <?dbhtml list-presentation="table"?>
444
445 <varlistentry id="catchsegv">
446 <term><command>catchsegv</command></term>
447 <listitem>
448 <para>Can be used to create a stack trace when a program
449 terminates with a segmentation fault</para>
450 <indexterm zone="ch-system-glibc catchsegv">
451 <primary sortas="b-catchsegv">catchsegv</primary>
452 </indexterm>
453 </listitem>
454 </varlistentry>
455
456 <varlistentry id="gencat">
457 <term><command>gencat</command></term>
458 <listitem>
459 <para>Generates message catalogues</para>
460 <indexterm zone="ch-system-glibc gencat">
461 <primary sortas="b-gencat">gencat</primary>
462 </indexterm>
463 </listitem>
464 </varlistentry>
465
466 <varlistentry id="getconf">
467 <term><command>getconf</command></term>
468 <listitem>
469 <para>Displays the system configuration values for file system
470 specific variables</para>
471 <indexterm zone="ch-system-glibc getconf">
472 <primary sortas="b-getconf">getconf</primary>
473 </indexterm>
474 </listitem>
475 </varlistentry>
476
477 <varlistentry id="getent">
478 <term><command>getent</command></term>
479 <listitem>
480 <para>Gets entries from an administrative database</para>
481 <indexterm zone="ch-system-glibc getent">
482 <primary sortas="b-getent">getent</primary>
483 </indexterm>
484 </listitem>
485 </varlistentry>
486
487 <varlistentry id="iconv">
488 <term><command>iconv</command></term>
489 <listitem>
490 <para>Performs character set conversion</para>
491 <indexterm zone="ch-system-glibc iconv">
492 <primary sortas="b-iconv">iconv</primary>
493 </indexterm>
494 </listitem>
495 </varlistentry>
496
497 <varlistentry id="iconvconfig">
498 <term><command>iconvconfig</command></term>
499 <listitem>
500 <para>Creates fastloading <command>iconv</command> module configuration
501 files</para>
502 <indexterm zone="ch-system-glibc iconvconfig">
503 <primary sortas="b-iconvconfig">iconvconfig</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="ldconfig">
509 <term><command>ldconfig</command></term>
510 <listitem>
511 <para>Configures the dynamic linker runtime bindings</para>
512 <indexterm zone="ch-system-glibc ldconfig">
513 <primary sortas="b-ldconfig">ldconfig</primary>
514 </indexterm>
515 </listitem>
516 </varlistentry>
517
518 <varlistentry id="ldd">
519 <term><command>ldd</command></term>
520 <listitem>
521 <para>Reports which shared libraries are required
522 by each given program or shared library</para>
523 <indexterm zone="ch-system-glibc ldd">
524 <primary sortas="b-ldd">ldd</primary>
525 </indexterm>
526 </listitem>
527 </varlistentry>
528
529 <varlistentry id="lddlibc4">
530 <term><command>lddlibc4</command></term>
531 <listitem>
532 <para>Assists <command>ldd</command> with object files</para>
533 <indexterm zone="ch-system-glibc lddlibc4">
534 <primary sortas="b-lddlibc4">lddlibc4</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="locale">
540 <term><command>locale</command></term>
541 <listitem>
542 <para>Prints various information about the current locale</para>
543 <indexterm zone="ch-system-glibc locale">
544 <primary sortas="b-locale">locale</primary>
545 </indexterm>
546 </listitem>
547 </varlistentry>
548
549 <varlistentry id="localedef">
550 <term><command>localedef</command></term>
551 <listitem>
552 <para>Compiles locale specifications</para>
553 <indexterm zone="ch-system-glibc localedef">
554 <primary sortas="b-localedef">localedef</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="mtrace">
560 <term><command>mtrace</command></term>
561 <listitem>
562 <para>Reads and interprets a memory trace file and displays a summary
563 in human-readable format</para>
564 <indexterm zone="ch-system-glibc mtrace">
565 <primary sortas="b-mtrace">mtrace</primary>
566 </indexterm>
567 </listitem>
568 </varlistentry>
569
570 <varlistentry id="nscd">
571 <term><command>nscd</command></term>
572 <listitem>
573 <para>A daemon that provides a cache for the most common name
574 service requests</para>
575 <indexterm zone="ch-system-glibc nscd">
576 <primary sortas="b-nscd">nscd</primary>
577 </indexterm>
578 </listitem>
579 </varlistentry>
580
581 <varlistentry id="pcprofiledump">
582 <term><command>pcprofiledump</command></term>
583 <listitem>
584 <para>Dumps information generated by PC profiling</para>
585 <indexterm zone="ch-system-glibc pcprofiledump">
586 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="pt_chown">
592 <term><command>pt_chown</command></term>
593 <listitem>
594 <para>A helper program for <command>grantpt</command> to set the owner,
595 group and access permissions of a slave pseudo terminal</para>
596 <indexterm zone="ch-system-glibc pt_chown">
597 <primary sortas="b-pt_chown">pt_chown</primary>
598 </indexterm>
599 </listitem>
600 </varlistentry>
601
602 <varlistentry id="rpcgen">
603 <term><command>rpcgen</command></term>
604 <listitem>
605 <para>Generates C code to implement the Remote Procedure Call (RPC)
606 protocol</para>
607 <indexterm zone="ch-system-glibc rpcgen">
608 <primary sortas="b-rpcgen">rpcgen</primary>
609 </indexterm>
610 </listitem>
611 </varlistentry>
612
613 <varlistentry id="sln">
614 <term><command>sln</command></term>
615 <listitem>
616 <para>A statically linked <command>ln</command> program</para>
617 <indexterm zone="ch-system-glibc sln">
618 <primary sortas="b-sln">sln</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <varlistentry id="sotruss">
624 <term><command>sotruss</command></term>
625 <listitem>
626 <para>Traces shared library procedure calls of a specified command</para>
627 <indexterm zone="ch-system-glibc sotruss">
628 <primary sortas="b-sotruss">sotruss</primary>
629 </indexterm>
630 </listitem>
631 </varlistentry>
632
633 <varlistentry id="sprof">
634 <term><command>sprof</command></term>
635 <listitem>
636 <para>Reads and displays shared object profiling data</para>
637 <indexterm zone="ch-system-glibc sprof">
638 <primary sortas="b-sprof">sprof</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 <varlistentry id="tzselect">
644 <term><command>tzselect</command></term>
645 <listitem>
646 <para>Asks the user about the location of the system and reports
647 the corresponding time zone description</para>
648 <indexterm zone="ch-system-glibc tzselect">
649 <primary sortas="b-tzselect">tzselect</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 <varlistentry id="xtrace">
655 <term><command>xtrace</command></term>
656 <listitem>
657 <para>Traces the execution of a program by printing the currently
658 executed function</para>
659 <indexterm zone="ch-system-glibc xtrace">
660 <primary sortas="b-xtrace">xtrace</primary>
661 </indexterm>
662 </listitem>
663 </varlistentry>
664
665 <varlistentry id="zdump">
666 <term><command>zdump</command></term>
667 <listitem>
668 <para>The time zone dumper</para>
669 <indexterm zone="ch-system-glibc zdump">
670 <primary sortas="b-zdump">zdump</primary>
671 </indexterm>
672 </listitem>
673 </varlistentry>
674
675 <varlistentry id="zic">
676 <term><command>zic</command></term>
677 <listitem>
678 <para>The time zone compiler</para>
679 <indexterm zone="ch-system-glibc zic">
680 <primary sortas="b-zic">zic</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="ld.so">
686 <term><filename class="libraryfile">ld.so</filename></term>
687 <listitem>
688 <para>The helper program for shared library executables</para>
689 <indexterm zone="ch-system-glibc ld.so">
690 <primary sortas="c-ld.so">ld.so</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="libBrokenLocale">
696 <term><filename class="libraryfile">libBrokenLocale</filename></term>
697 <listitem>
698 <para>Used internally by Glibc as a gross hack to get broken programs
699 (e.g., some Motif applications) running. See comments in
700 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
701 for more information</para>
702 <indexterm zone="ch-system-glibc libBrokenLocale">
703 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
704 </indexterm>
705 </listitem>
706 </varlistentry>
707
708 <varlistentry id="libSegFault">
709 <term><filename class="libraryfile">libSegFault</filename></term>
710 <listitem>
711 <para>The segmentation fault signal handler, used by
712 <command>catchsegv</command></para>
713 <indexterm zone="ch-system-glibc libSegFault">
714 <primary sortas="c-libSegFault">libSegFault</primary>
715 </indexterm>
716 </listitem>
717 </varlistentry>
718
719 <varlistentry id="libanl">
720 <term><filename class="libraryfile">libanl</filename></term>
721 <listitem>
722 <para>An asynchronous name lookup library</para>
723 <indexterm zone="ch-system-glibc libanl">
724 <primary sortas="c-libanl">libanl</primary>
725 </indexterm>
726 </listitem>
727 </varlistentry>
728
729 <varlistentry id="libbsd-compat">
730 <term><filename class="libraryfile">libbsd-compat</filename></term>
731 <listitem>
732 <para>Provides the portability needed in order to run certain
733 Berkeley Software Distribution (BSD) programs under Linux</para>
734 <indexterm zone="ch-system-glibc libbsd-compat">
735 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
736 </indexterm>
737 </listitem>
738 </varlistentry>
739
740 <varlistentry id="libc">
741 <term><filename class="libraryfile">libc</filename></term>
742 <listitem>
743 <para>The main C library</para>
744 <indexterm zone="ch-system-glibc libc">
745 <primary sortas="c-libc">libc</primary>
746 </indexterm>
747 </listitem>
748 </varlistentry>
749
750 <varlistentry id="libcidn">
751 <term><filename class="libraryfile">libcidn</filename></term>
752 <listitem>
753 <para>Used internally by Glibc for handling internationalized domain
754 names in the <function>getaddrinfo()</function> function</para>
755 <indexterm zone="ch-system-glibc libcidn">
756 <primary sortas="c-libcidn">libcidn</primary>
757 </indexterm>
758 </listitem>
759 </varlistentry>
760
761 <varlistentry id="libcrypt">
762 <term><filename class="libraryfile">libcrypt</filename></term>
763 <listitem>
764 <para>The cryptography library</para>
765 <indexterm zone="ch-system-glibc libcrypt">
766 <primary sortas="c-libcrypt">libcrypt</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="libdl">
772 <term><filename class="libraryfile">libdl</filename></term>
773 <listitem>
774 <para>The dynamic linking interface library</para>
775 <indexterm zone="ch-system-glibc libdl">
776 <primary sortas="c-libdl">libdl</primary>
777 </indexterm>
778 </listitem>
779 </varlistentry>
780
781 <varlistentry id="libg">
782 <term><filename class="libraryfile">libg</filename></term>
783 <listitem>
784 <para>Dummy library containing no functions. Previously was a runtime
785 library for <command>g++</command></para>
786 <indexterm zone="ch-system-glibc libg">
787 <primary sortas="c-libg">libg</primary>
788 </indexterm>
789 </listitem>
790 </varlistentry>
791
792 <varlistentry id="libieee">
793 <term><filename class="libraryfile">libieee</filename></term>
794 <listitem>
795 <para>Linking in this module forces error handling rules for math
796 functions as defined by the Institute of Electrical and Electronic
797 Engineers (IEEE). The default is POSIX.1 error handling</para>
798 <indexterm zone="ch-system-glibc libieee">
799 <primary sortas="c-libieee">libieee</primary>
800 </indexterm>
801 </listitem>
802 </varlistentry>
803
804 <varlistentry id="libm">
805 <term><filename class="libraryfile">libm</filename></term>
806 <listitem>
807 <para>The mathematical library</para>
808 <indexterm zone="ch-system-glibc libm">
809 <primary sortas="c-libm">libm</primary>
810 </indexterm>
811 </listitem>
812 </varlistentry>
813
814 <varlistentry id="libmcheck">
815 <term><filename class="libraryfile">libmcheck</filename></term>
816 <listitem>
817 <para>Turns on memory allocation checking when linked to</para>
818 <indexterm zone="ch-system-glibc libmcheck">
819 <primary sortas="c-libmcheck">libmcheck</primary>
820 </indexterm>
821 </listitem>
822 </varlistentry>
823
824 <varlistentry id="libmemusage">
825 <term><filename class="libraryfile">libmemusage</filename></term>
826 <listitem>
827 <para>Used by <command>memusage</command> to help collect
828 information about the memory usage of a program</para>
829 <indexterm zone="ch-system-glibc libmemusage">
830 <primary sortas="c-libmemusage">libmemusage</primary>
831 </indexterm>
832 </listitem>
833 </varlistentry>
834
835 <varlistentry id="libnsl">
836 <term><filename class="libraryfile">libnsl</filename></term>
837 <listitem>
838 <para>The network services library</para>
839 <indexterm zone="ch-system-glibc libnsl">
840 <primary sortas="c-libnsl">libnsl</primary>
841 </indexterm>
842 </listitem>
843 </varlistentry>
844
845 <varlistentry id="libnss">
846 <term><filename class="libraryfile">libnss</filename></term>
847 <listitem>
848 <para>The Name Service Switch libraries, containing functions for
849 resolving host names, user names, group names, aliases, services,
850 protocols, etc.</para>
851 <indexterm zone="ch-system-glibc libnss">
852 <primary sortas="c-libnss">libnss</primary>
853 </indexterm>
854 </listitem>
855 </varlistentry>
856
857 <varlistentry id="libpcprofile">
858 <term><filename class="libraryfile">libpcprofile</filename></term>
859 <listitem>
860 <para>Contains profiling functions used to track the amount of CPU
861 time spent in specific source code lines</para>
862 <indexterm zone="ch-system-glibc libpcprofile">
863 <primary sortas="c-libpcprofile">libpcprofile</primary>
864 </indexterm>
865 </listitem>
866 </varlistentry>
867
868 <varlistentry id="libpthread">
869 <term><filename class="libraryfile">libpthread</filename></term>
870 <listitem>
871 <para>The POSIX threads library</para>
872 <indexterm zone="ch-system-glibc libpthread">
873 <primary sortas="c-libpthread">libpthread</primary>
874 </indexterm>
875 </listitem>
876 </varlistentry>
877
878 <varlistentry id="libresolv">
879 <term><filename class="libraryfile">libresolv</filename></term>
880 <listitem>
881 <para>Contains functions for creating, sending, and interpreting
882 packets to the Internet domain name servers</para>
883 <indexterm zone="ch-system-glibc libresolv">
884 <primary sortas="c-libresolv">libresolv</primary>
885 </indexterm>
886 </listitem>
887 </varlistentry>
888
889 <varlistentry id="librpcsvc">
890 <term><filename class="libraryfile">librpcsvc</filename></term>
891 <listitem>
892 <para>Contains functions providing miscellaneous RPC services</para>
893 <indexterm zone="ch-system-glibc librpcsvc">
894 <primary sortas="c-librpcsvc">librpcsvc</primary>
895 </indexterm>
896 </listitem>
897 </varlistentry>
898
899 <varlistentry id="librt">
900 <term><filename class="libraryfile">librt</filename></term>
901 <listitem>
902 <para>Contains functions providing most of the interfaces specified
903 by the POSIX.1b Realtime Extension</para>
904 <indexterm zone="ch-system-glibc librt">
905 <primary sortas="c-librt">librt</primary>
906 </indexterm>
907 </listitem>
908 </varlistentry>
909
910 <varlistentry id="libthread_db">
911 <term><filename class="libraryfile">libthread_db</filename></term>
912 <listitem>
913 <para>Contains functions useful for building debuggers for
914 multi-threaded programs</para>
915 <indexterm zone="ch-system-glibc libthread_db">
916 <primary sortas="c-libthread_db">libthread_db</primary>
917 </indexterm>
918 </listitem>
919 </varlistentry>
920
921 <varlistentry id="libutil">
922 <term><filename class="libraryfile">libutil</filename></term>
923 <listitem>
924 <para>Contains code for <quote>standard</quote> functions used in
925 many different Unix utilities</para>
926 <indexterm zone="ch-system-glibc libutil">
927 <primary sortas="c-libutil">libutil</primary>
928 </indexterm>
929 </listitem>
930 </varlistentry>
931
932 </variablelist>
933
934 </sect2>
935
936</sect1>
Note: See TracBrowser for help on using the repository browser.