source: chapter06/glibc.xml@ a3af16f

7.5-systemd 7.6-systemd 7.7-systemd 7.8-systemd 7.9-systemd
Last change on this file since a3af16f was a3af16f, checked in by Matthew Burgess <matthew@…>, 11 years ago

Merge latest trunk updates to systemd branch

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/branches/systemd/BOOK@10365 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-system-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Glibc package contains the main C library. This library provides
27 the basic routines for allocating memory, searching directories, opening and
28 closing files, reading and writing files, string handling, pattern matching,
29 arithmetic, and so on.</para>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-ch6-sbu;</seg>
37 <seg>&glibc-ch6-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <note>
47 <para>Some packages outside of LFS suggest installing GNU libiconv in
48 order to translate data from one encoding to another. The project's
49 home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
50 <quote>This library provides an <function>iconv()</function>
51 implementation, for use on systems which don't have one, or whose
52 implementation cannot convert from/to Unicode.</quote> Glibc provides
53 an <function>iconv()</function> implementation and can convert from/to
54 Unicode, therefore libiconv is not required on an LFS system.</para>
55 </note>
56
57 <para>The Glibc build system is self-contained and will install
58 perfectly, even though the compiler specs file and linker are still
59 pointing at <filename class="directory">/tools</filename>. The specs
60 and linker cannot be adjusted before the Glibc install because the
61 Glibc autoconf tests would give false results and defeat the goal
62 of achieving a clean build.</para>
63
64 <para>An upstream change needs to be reverted:</para>
65
66<screen><userinput remap="pre">sed -i -e 's/static __m128i/inline &amp;/' sysdeps/x86_64/multiarch/strstr.c</userinput></screen>
67
68 <para>Allow Glibc to be built with Make-&make-version;:</para>
69
70<screen><userinput remap="pre">sed -r -i 's/(3..89..)/\1 | 4.*/' configure</userinput></screen>
71
72 <para>Some of the Glibc programs use non-FHS compilant
73 <filename class="directory">/var/db</filename> directory
74 to store their runtime data. Apply the following patch to make such programs
75 store their runtime data in the FHS-compliant locations:</para>
76
77<screen><userinput remap="pre">patch -Np1 -i ../&glibc-fhs-patch;</userinput></screen>
78
79 <para>The Glibc documentation recommends building Glibc outside of the source
80 directory in a dedicated build directory:</para>
81
82<screen><userinput remap="pre">mkdir -v ../glibc-build
83cd ../glibc-build</userinput></screen>
84
85 <para>Prepare Glibc for compilation:</para>
86
87<!-- We would get /usr/lib/glibc/getconf instead of /usr/lib/getconf and
88 /usr/lib/getconf was used before. Other distros seem to use same
89 libexecdir -->
90<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
91 --prefix=/usr \
92 --disable-profile \
93 --enable-kernel=&min-kernel; \
94 --libexecdir=/usr/lib</userinput></screen>
95 <variablelist>
96 <title>The meaning of the new configure options:</title>
97
98 <varlistentry>
99 <term><parameter>--libexecdir=/usr/lib</parameter></term>
100 <listitem>
101 <para>This changes the location of some auxillary files from the
102 default of <filename class="directory">/usr/libexec</filename> to
103 <filename class="directory">/usr/lib/glibc</filename>.</para>
104 </listitem>
105 </varlistentry>
106
107 </variablelist>
108
109 <para>Compile the package:</para>
110
111<screen><userinput remap="make">make</userinput></screen>
112
113 <important>
114 <para>In this section, the test suite for Glibc is considered critical.
115 Do not skip it under any circumstance.</para>
116 </important>
117
118 <para>Generally a few tests do not pass, but you can generally ignore
119 any of the test failures listed below. Now test the build results:</para>
120
121<screen><userinput remap="test">make -k check 2&gt;&amp;1 | tee glibc-check-log
122grep Error glibc-check-log</userinput></screen>
123
124 <para>You will probably see an expected (ignored) failure in the
125 <emphasis>posix/annexc</emphasis> and
126 <emphasis>conform/run-conformtest</emphasis> tests. In addition the Glibc
127 test suite is somewhat dependent on the host system. This is a list of the
128 most common issues:</para>
129
130 <itemizedlist>
131
132 <listitem>
133 <para>The <emphasis>nptl/tst-clock2</emphasis>,
134 <emphasis>nptl/tst-attr3</emphasis>,
135 <emphasis>tst/tst-cputimer1</emphasis>, and
136 <emphasis>rt/tst-cpuclock2</emphasis>
137 tests have been known to fail. The
138 reason is not completely understood, but indications are that minor
139 timing issues can trigger these failures.</para>
140 </listitem>
141
142 <listitem>
143 <para>The math tests sometimes fail when running on
144 systems where the CPU is not a relatively new genuine Intel or
145 authentic AMD processor.</para>
146 </listitem>
147
148 <listitem>
149 <para>When running on older and slower hardware or on systems under
150 load, some tests can fail because of test timeouts being exceeded.
151 Modifying the make check command to set a TIMEOUTFACTOR is reported to
152 help eliminate these errors (e.g. <command>TIMEOUTFACTOR=16
153 make -k check</command>).</para>
154 </listitem>
155
156 <listitem>
157 <para>posix/tst-getaddrinfo4 will always fail due to not having a network
158 connection when the test is run.</para>
159 </listitem>
160
161 <listitem>
162 <para>Other tests known to fail on some architectures are posix/bug-regex32,
163 misc/tst-writev, elf/check-textrel, nptl/tst-getpid2, and stdio-common/bug22.</para>
164 </listitem>
165
166 </itemizedlist>
167
168 <para>Though it is a harmless message, the install stage of Glibc will
169 complain about the absence of <filename>/etc/ld.so.conf</filename>.
170 Prevent this warning with:</para>
171
172<screen><userinput remap="install">touch /etc/ld.so.conf</userinput></screen>
173
174 <para>Install the package:</para>
175
176<screen><userinput remap="install">make install</userinput></screen>
177
178 <para>Install NIS and RPC related headers that are not installed by
179 default; these are required to rebuild glibc and by several BLFS
180 packages:</para>
181
182<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/sunrpc/rpc/*.h /usr/include/rpc
183cp -v ../glibc-&glibc-version;/sunrpc/rpcsvc/*.h /usr/include/rpcsvc
184cp -v ../glibc-&glibc-version;/nis/rpcsvc/*.h /usr/include/rpcsvc</userinput></screen>
185
186 <para>Install the configuration file and runtime directory for
187 <command>nscd</command>:</para>
188
189<screen><userinput remap="install">cp -v ../glibc-&glibc-version;/nscd/nscd.conf /etc/nscd.conf
190mkdir -pv /var/cache/nscd</userinput></screen>
191
192 <para>The locales that can make the system respond in a different language
193 were not installed by the above command. None of the locales are required,
194 but if some of them are missing, test suites of the future packages would
195 skip important testcases.</para>
196
197 <para>Individual locales can be installed using the
198 <command>localedef</command> program. E.g., the first
199 <command>localedef</command> command below combines the
200 <filename>/usr/share/i18n/locales/cs_CZ</filename>
201 charset-independent locale definition with the
202 <filename>/usr/share/i18n/charmaps/UTF-8.gz</filename>
203 charmap definition and appends the result to the
204 <filename>/usr/lib/locale/locale-archive</filename> file.
205 The following instructions will install the minimum set of
206 locales necessary for the optimal coverage of tests:</para>
207
208<screen role="nodump"><userinput remap="locale-test">mkdir -pv /usr/lib/locale
209localedef -i cs_CZ -f UTF-8 cs_CZ.UTF-8
210localedef -i de_DE -f ISO-8859-1 de_DE
211localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
212localedef -i de_DE -f UTF-8 de_DE.UTF-8
213localedef -i en_GB -f UTF-8 en_GB.UTF-8
214localedef -i en_HK -f ISO-8859-1 en_HK
215localedef -i en_PH -f ISO-8859-1 en_PH
216localedef -i en_US -f ISO-8859-1 en_US
217localedef -i en_US -f UTF-8 en_US.UTF-8
218localedef -i es_MX -f ISO-8859-1 es_MX
219localedef -i fa_IR -f UTF-8 fa_IR
220localedef -i fr_FR -f ISO-8859-1 fr_FR
221localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
222localedef -i fr_FR -f UTF-8 fr_FR.UTF-8
223localedef -i it_IT -f ISO-8859-1 it_IT
224localedef -i it_IT -f UTF-8 it_IT.UTF-8
225localedef -i ja_JP -f EUC-JP ja_JP
226localedef -i ru_RU -f KOI8-R ru_RU.KOI8-R
227localedef -i ru_RU -f UTF-8 ru_RU.UTF-8
228localedef -i tr_TR -f UTF-8 tr_TR.UTF-8
229localedef -i zh_CN -f GB18030 zh_CN.GB18030</userinput></screen>
230
231 <para>In addition, install the locale for your own country, language and
232 character set.</para>
233
234 <para>Alternatively, install all locales listed in the
235 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
236 (it includes every locale listed above and many more) at once with the
237 following time-consuming command:</para>
238
239<screen><userinput remap="locale-full">make localedata/install-locales</userinput></screen>
240
241 <para>Then use the <command>localedef</command> command to create and
242 install locales not listed in the
243 <filename>glibc-&glibc-version;/localedata/SUPPORTED</filename> file
244 in the unlikely case you need them.</para>
245
246 </sect2>
247
248 <sect2 id="conf-glibc" role="configuration">
249 <title>Configuring Glibc</title>
250
251 <indexterm zone="conf-glibc">
252 <primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
253 </indexterm>
254
255 <indexterm zone="conf-glibc">
256 <primary sortas="e-/etc/localtime">/etc/localtime</primary>
257 </indexterm>
258
259 <para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
260 because, although Glibc provides defaults when this file is missing or corrupt,
261 the Glibc defaults do not work well in a networked environment. The time zone
262 also needs to be configured.</para>
263
264 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
265 following:</para>
266
267<screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"
268<literal># Begin /etc/nsswitch.conf
269
270passwd: files
271group: files
272shadow: files
273
274hosts: files dns
275networks: files
276
277protocols: files
278services: files
279ethers: files
280rpc: files
281
282# End /etc/nsswitch.conf</literal>
283EOF</userinput></screen>
284
285 <para>Install timezone data:</para>
286<screen><userinput>tar -xf ../tzdata&tzdata-version;.tar.gz
287
288ZONEINFO=/usr/share/zoneinfo
289mkdir -pv $ZONEINFO/{posix,right}
290
291for tz in etcetera southamerica northamerica europe africa antarctica \
292 asia australasia backward pacificnew solar87 solar88 solar89 \
293 systemv; do
294 zic -L /dev/null -d $ZONEINFO -y "sh yearistype.sh" ${tz}
295 zic -L /dev/null -d $ZONEINFO/posix -y "sh yearistype.sh" ${tz}
296 zic -L leapseconds -d $ZONEINFO/right -y "sh yearistype.sh" ${tz}
297done
298
299cp -v zone.tab iso3166.tab $ZONEINFO
300zic -d $ZONEINFO -p America/New_York
301unset ZONEINFO</userinput></screen>
302
303 <variablelist>
304 <title>The meaning of the zic commands:</title>
305
306 <varlistentry>
307 <term><parameter>zic -L /dev/null ...</parameter></term>
308 <listitem>
309 <para>This creates posix timezones, without any leap seconds. It is
310 conventional to put these in both
311 <filename class="directory">zoneinfo</filename> and
312 <filename class="directory">zoneinfo/posix</filename>. It is
313 necessary to put the POSIX timezones in
314 <filename class="directory">zoneinfo</filename>, otherwise various
315 test-suites will report errors. On an embedded system, where space is
316 tight and you do not intend to ever update the timezones, you could save
317 1.9MB by not using the <filename class="directory">posix</filename>
318 directory, but some applications or test-suites might give less good
319 results</para>
320 </listitem>
321 </varlistentry>
322 <varlistentry>
323 <term><parameter>zic -L leapseconds ...</parameter></term>
324 <listitem>
325 <para>This creates right timezones, including leap seconds. On an
326 embedded system, where space is tight and you do not intend to
327 ever update the timezones, or care about the correct time, you could
328 save 1.9MB by omitting the <filename class="directory">right</filename>
329 directory.</para>
330 </listitem>
331 </varlistentry>
332 <varlistentry>
333 <term><parameter>zic ... -p ...</parameter></term>
334 <listitem>
335 <para>This creates the <filename>posixrules</filename> file. We use
336 New York because POSIX requires the daylight savings time rules
337 to be in accordance with US rules.</para>
338 </listitem>
339 </varlistentry>
340 </variablelist>
341
342
343 <para>One way to determine the local time zone is to run the following
344 script:</para>
345
346<screen role="nodump"><userinput>tzselect</userinput></screen>
347
348 <para>After answering a few questions about the location, the script will
349 output the name of the time zone (e.g.,
350 <emphasis>America/Edmonton</emphasis>). There are also some other possible
351 timezones listed in <filename
352 class='directory'>/usr/share/zoneinfo</filename> such as
353 <emphasis>Canada/Eastern</emphasis> or <emphasis>EST5EDT</emphasis> that
354 are not identified by the script but can be used.</para>
355
356 <para>Then create the <filename>/etc/localtime</filename> file by
357 running:</para>
358
359<screen><userinput>ln -sv /usr/share/zoneinfo/<replaceable>&lt;xxx&gt;</replaceable> /etc/localtime</userinput></screen>
360
361 <para>Replace <replaceable>&lt;xxx&gt;</replaceable> with the name of the
362 time zone selected (e.g., Canada/Eastern).</para>
363
364 </sect2>
365
366 <sect2 id="conf-ld" role="configuration">
367 <title>Configuring the Dynamic Loader</title>
368
369 <indexterm zone="conf-ld">
370 <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
371 </indexterm>
372
373 <para>By default, the dynamic loader (<filename
374 class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
375 <filename class="directory">/lib</filename> and <filename
376 class="directory">/usr/lib</filename> for dynamic libraries that are
377 needed by programs as they are run. However, if there are libraries in
378 directories other than <filename class="directory">/lib</filename> and
379 <filename class="directory">/usr/lib</filename>, these need to be added
380 to the <filename>/etc/ld.so.conf</filename> file in order for the
381 dynamic loader to find them. Two directories that are commonly known
382 to contain additional libraries are <filename
383 class="directory">/usr/local/lib</filename> and <filename
384 class="directory">/opt/lib</filename>, so add those directories to the
385 dynamic loader's search path.</para>
386
387 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
388 following:</para>
389
390<screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"
391<literal># Begin /etc/ld.so.conf
392/usr/local/lib
393/opt/lib
394</literal>
395EOF</userinput></screen>
396
397 <para>If desired, the dynamic loader can also search a directory and
398 include the contents of files found there. Generally the files in
399 this include directory are one line specifying the desired library path.
400 To add this capability run the following commands:</para>
401
402<screen role="nodump"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
403<literal># Add an include directory
404include /etc/ld.so.conf.d/*.conf
405</literal>
406EOF
407mkdir -pv /etc/ld.so.conf.d</userinput></screen>
408
409 </sect2>
410
411 <sect2 id="contents-glibc" role="content">
412 <title>Contents of Glibc</title>
413
414 <segmentedlist>
415 <segtitle>Installed programs</segtitle>
416 <segtitle>Installed libraries</segtitle>
417 <segtitle>Installed directories</segtitle>
418
419 <seglistitem>
420 <seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
421 ldd, lddlibc4, locale, localedef, makedb, mtrace, nscd, pcprofiledump,
422 pldd, rpcgen, sln, sotruss, sprof, tzselect, xtrace,
423 zdump, and zic</seg>
424 <seg>ld.so, libBrokenLocale.{a,so}, libSegFault.so, libanl.{a,so},
425 libbsd-compat.a, libc.{a,so}, libc_nonshared.a, libcidn.so,
426 libcrypt.{a,so}, libdl.{a,so}, libg.a, libieee.a, libm.{a,so},
427 libmcheck.a, libmemusage.so, libnsl.{a,so}, libnss_compat.so,
428 libnss_dns.so, libnss_files.so, libnss_hesiod.so, libnss_nis.so,
429 libnss_nisplus.so, libpcprofile.so, libpthread.{a,so},
430 libpthread_nonshared.a, libresolv.{a,so}, librpcsvc.a, librt.{a,so},
431 libthread_db.so, and libutil.{a,so}</seg>
432 <seg>/usr/include/arpa, /usr/include/bits, /usr/include/gnu,
433 /usr/include/net, /usr/include/netash, /usr/include/netatalk,
434 /usr/include/netax25, /usr/include/neteconet, /usr/include/netinet,
435 /usr/include/netipx, /usr/include/netiucv, /usr/include/netpacket,
436 /usr/include/netrom, /usr/include/netrose, /usr/include/nfs,
437 /usr/include/protocols, /usr/include/rpc, /usr/include/rpcsvc,
438 /usr/include/sys, /usr/lib/audit, /usr/lib/gconv, /usr/lib/getconf,
439 /usr/lib/locale, /usr/share/i18n, /usr/share/zoneinfo, /var/cache/nscd,
440 and /var/lib/nss_db</seg>
441 </seglistitem>
442 </segmentedlist>
443
444 <variablelist>
445 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
446 <?dbfo list-presentation="list"?>
447 <?dbhtml list-presentation="table"?>
448
449 <varlistentry id="catchsegv">
450 <term><command>catchsegv</command></term>
451 <listitem>
452 <para>Can be used to create a stack trace when a program
453 terminates with a segmentation fault</para>
454 <indexterm zone="ch-system-glibc catchsegv">
455 <primary sortas="b-catchsegv">catchsegv</primary>
456 </indexterm>
457 </listitem>
458 </varlistentry>
459
460 <varlistentry id="gencat">
461 <term><command>gencat</command></term>
462 <listitem>
463 <para>Generates message catalogues</para>
464 <indexterm zone="ch-system-glibc gencat">
465 <primary sortas="b-gencat">gencat</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="getconf">
471 <term><command>getconf</command></term>
472 <listitem>
473 <para>Displays the system configuration values for file system
474 specific variables</para>
475 <indexterm zone="ch-system-glibc getconf">
476 <primary sortas="b-getconf">getconf</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="getent">
482 <term><command>getent</command></term>
483 <listitem>
484 <para>Gets entries from an administrative database</para>
485 <indexterm zone="ch-system-glibc getent">
486 <primary sortas="b-getent">getent</primary>
487 </indexterm>
488 </listitem>
489 </varlistentry>
490
491 <varlistentry id="iconv">
492 <term><command>iconv</command></term>
493 <listitem>
494 <para>Performs character set conversion</para>
495 <indexterm zone="ch-system-glibc iconv">
496 <primary sortas="b-iconv">iconv</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="iconvconfig">
502 <term><command>iconvconfig</command></term>
503 <listitem>
504 <para>Creates fastloading <command>iconv</command> module configuration
505 files</para>
506 <indexterm zone="ch-system-glibc iconvconfig">
507 <primary sortas="b-iconvconfig">iconvconfig</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="ldconfig">
513 <term><command>ldconfig</command></term>
514 <listitem>
515 <para>Configures the dynamic linker runtime bindings</para>
516 <indexterm zone="ch-system-glibc ldconfig">
517 <primary sortas="b-ldconfig">ldconfig</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="ldd">
523 <term><command>ldd</command></term>
524 <listitem>
525 <para>Reports which shared libraries are required
526 by each given program or shared library</para>
527 <indexterm zone="ch-system-glibc ldd">
528 <primary sortas="b-ldd">ldd</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="lddlibc4">
534 <term><command>lddlibc4</command></term>
535 <listitem>
536 <para>Assists <command>ldd</command> with object files</para>
537 <indexterm zone="ch-system-glibc lddlibc4">
538 <primary sortas="b-lddlibc4">lddlibc4</primary>
539 </indexterm>
540 </listitem>
541 </varlistentry>
542
543 <varlistentry id="locale">
544 <term><command>locale</command></term>
545 <listitem>
546 <para>Prints various information about the current locale</para>
547 <indexterm zone="ch-system-glibc locale">
548 <primary sortas="b-locale">locale</primary>
549 </indexterm>
550 </listitem>
551 </varlistentry>
552
553 <varlistentry id="localedef">
554 <term><command>localedef</command></term>
555 <listitem>
556 <para>Compiles locale specifications</para>
557 <indexterm zone="ch-system-glibc localedef">
558 <primary sortas="b-localedef">localedef</primary>
559 </indexterm>
560 </listitem>
561 </varlistentry>
562
563 <varlistentry id="makedb">
564 <term><command>makedb</command></term>
565 <listitem>
566 <para>Creates a simple database from textual input</para>
567 <indexterm zone="ch-system-glibc makedb">
568 <primary sortas="b-makedb">makedb</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="mtrace">
574 <term><command>mtrace</command></term>
575 <listitem>
576 <para>Reads and interprets a memory trace file and displays a summary
577 in human-readable format</para>
578 <indexterm zone="ch-system-glibc mtrace">
579 <primary sortas="b-mtrace">mtrace</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="nscd">
585 <term><command>nscd</command></term>
586 <listitem>
587 <para>A daemon that provides a cache for the most common name
588 service requests</para>
589 <indexterm zone="ch-system-glibc nscd">
590 <primary sortas="b-nscd">nscd</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594
595 <varlistentry id="pcprofiledump">
596 <term><command>pcprofiledump</command></term>
597 <listitem>
598 <para>Dumps information generated by PC profiling</para>
599 <indexterm zone="ch-system-glibc pcprofiledump">
600 <primary sortas="b-pcprofiledump">pcprofiledump</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604
605 <varlistentry id="pldd">
606 <term><command>pldd</command></term>
607 <listitem>
608 <para>Lists dynamic shared objects used by running processes</para>
609 <indexterm zone="ch-system-glibc pldd">
610 <primary sortas="b-pldd">pldd</primary>
611 </indexterm>
612 </listitem>
613 </varlistentry>
614<!--
615 <varlistentry id="pt_chown">
616 <term><command>pt_chown</command></term>
617 <listitem>
618 <para>A helper program for <command>grantpt</command> to set the owner,
619 group and access permissions of a slave pseudo terminal</para>
620 <indexterm zone="ch-system-glibc pt_chown">
621 <primary sortas="b-pt_chown">pt_chown</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625-->
626 <varlistentry id="rpcgen">
627 <term><command>rpcgen</command></term>
628 <listitem>
629 <para>Generates C code to implement the Remote Procedure Call (RPC)
630 protocol</para>
631 <indexterm zone="ch-system-glibc rpcgen">
632 <primary sortas="b-rpcgen">rpcgen</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="sln">
638 <term><command>sln</command></term>
639 <listitem>
640 <para>A statically linked <command>ln</command> program</para>
641 <indexterm zone="ch-system-glibc sln">
642 <primary sortas="b-sln">sln</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="sotruss">
648 <term><command>sotruss</command></term>
649 <listitem>
650 <para>Traces shared library procedure calls of a specified command</para>
651 <indexterm zone="ch-system-glibc sotruss">
652 <primary sortas="b-sotruss">sotruss</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry>
656
657 <varlistentry id="sprof">
658 <term><command>sprof</command></term>
659 <listitem>
660 <para>Reads and displays shared object profiling data</para>
661 <indexterm zone="ch-system-glibc sprof">
662 <primary sortas="b-sprof">sprof</primary>
663 </indexterm>
664 </listitem>
665 </varlistentry>
666
667 <varlistentry id="tzselect">
668 <term><command>tzselect</command></term>
669 <listitem>
670 <para>Asks the user about the location of the system and reports
671 the corresponding time zone description</para>
672 <indexterm zone="ch-system-glibc tzselect">
673 <primary sortas="b-tzselect">tzselect</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="xtrace">
679 <term><command>xtrace</command></term>
680 <listitem>
681 <para>Traces the execution of a program by printing the currently
682 executed function</para>
683 <indexterm zone="ch-system-glibc xtrace">
684 <primary sortas="b-xtrace">xtrace</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="zdump">
690 <term><command>zdump</command></term>
691 <listitem>
692 <para>The time zone dumper</para>
693 <indexterm zone="ch-system-glibc zdump">
694 <primary sortas="b-zdump">zdump</primary>
695 </indexterm>
696 </listitem>
697 </varlistentry>
698
699 <varlistentry id="zic">
700 <term><command>zic</command></term>
701 <listitem>
702 <para>The time zone compiler</para>
703 <indexterm zone="ch-system-glibc zic">
704 <primary sortas="b-zic">zic</primary>
705 </indexterm>
706 </listitem>
707 </varlistentry>
708
709 <varlistentry id="ld.so">
710 <term><filename class="libraryfile">ld.so</filename></term>
711 <listitem>
712 <para>The helper program for shared library executables</para>
713 <indexterm zone="ch-system-glibc ld.so">
714 <primary sortas="c-ld.so">ld.so</primary>
715 </indexterm>
716 </listitem>
717 </varlistentry>
718
719 <varlistentry id="libBrokenLocale">
720 <term><filename class="libraryfile">libBrokenLocale</filename></term>
721 <listitem>
722 <para>Used internally by Glibc as a gross hack to get broken programs
723 (e.g., some Motif applications) running. See comments in
724 <filename>glibc-&glibc-version;/locale/broken_cur_max.c</filename>
725 for more information</para>
726 <indexterm zone="ch-system-glibc libBrokenLocale">
727 <primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
728 </indexterm>
729 </listitem>
730 </varlistentry>
731
732 <varlistentry id="libSegFault">
733 <term><filename class="libraryfile">libSegFault</filename></term>
734 <listitem>
735 <para>The segmentation fault signal handler, used by
736 <command>catchsegv</command></para>
737 <indexterm zone="ch-system-glibc libSegFault">
738 <primary sortas="c-libSegFault">libSegFault</primary>
739 </indexterm>
740 </listitem>
741 </varlistentry>
742
743 <varlistentry id="libanl">
744 <term><filename class="libraryfile">libanl</filename></term>
745 <listitem>
746 <para>An asynchronous name lookup library</para>
747 <indexterm zone="ch-system-glibc libanl">
748 <primary sortas="c-libanl">libanl</primary>
749 </indexterm>
750 </listitem>
751 </varlistentry>
752
753 <varlistentry id="libbsd-compat">
754 <term><filename class="libraryfile">libbsd-compat</filename></term>
755 <listitem>
756 <para>Provides the portability needed in order to run certain
757 Berkeley Software Distribution (BSD) programs under Linux</para>
758 <indexterm zone="ch-system-glibc libbsd-compat">
759 <primary sortas="c-libbsd-compat">libbsd-compat</primary>
760 </indexterm>
761 </listitem>
762 </varlistentry>
763
764 <varlistentry id="libc">
765 <term><filename class="libraryfile">libc</filename></term>
766 <listitem>
767 <para>The main C library</para>
768 <indexterm zone="ch-system-glibc libc">
769 <primary sortas="c-libc">libc</primary>
770 </indexterm>
771 </listitem>
772 </varlistentry>
773
774 <varlistentry id="libcidn">
775 <term><filename class="libraryfile">libcidn</filename></term>
776 <listitem>
777 <para>Used internally by Glibc for handling internationalized domain
778 names in the <function>getaddrinfo()</function> function</para>
779 <indexterm zone="ch-system-glibc libcidn">
780 <primary sortas="c-libcidn">libcidn</primary>
781 </indexterm>
782 </listitem>
783 </varlistentry>
784
785 <varlistentry id="libcrypt">
786 <term><filename class="libraryfile">libcrypt</filename></term>
787 <listitem>
788 <para>The cryptography library</para>
789 <indexterm zone="ch-system-glibc libcrypt">
790 <primary sortas="c-libcrypt">libcrypt</primary>
791 </indexterm>
792 </listitem>
793 </varlistentry>
794
795 <varlistentry id="libdl">
796 <term><filename class="libraryfile">libdl</filename></term>
797 <listitem>
798 <para>The dynamic linking interface library</para>
799 <indexterm zone="ch-system-glibc libdl">
800 <primary sortas="c-libdl">libdl</primary>
801 </indexterm>
802 </listitem>
803 </varlistentry>
804
805 <varlistentry id="libg">
806 <term><filename class="libraryfile">libg</filename></term>
807 <listitem>
808 <para>Dummy library containing no functions. Previously was a runtime
809 library for <command>g++</command></para>
810 <indexterm zone="ch-system-glibc libg">
811 <primary sortas="c-libg">libg</primary>
812 </indexterm>
813 </listitem>
814 </varlistentry>
815
816 <varlistentry id="libieee">
817 <term><filename class="libraryfile">libieee</filename></term>
818 <listitem>
819 <para>Linking in this module forces error handling rules for math
820 functions as defined by the Institute of Electrical and Electronic
821 Engineers (IEEE). The default is POSIX.1 error handling</para>
822 <indexterm zone="ch-system-glibc libieee">
823 <primary sortas="c-libieee">libieee</primary>
824 </indexterm>
825 </listitem>
826 </varlistentry>
827
828 <varlistentry id="libm">
829 <term><filename class="libraryfile">libm</filename></term>
830 <listitem>
831 <para>The mathematical library</para>
832 <indexterm zone="ch-system-glibc libm">
833 <primary sortas="c-libm">libm</primary>
834 </indexterm>
835 </listitem>
836 </varlistentry>
837
838 <varlistentry id="libmcheck">
839 <term><filename class="libraryfile">libmcheck</filename></term>
840 <listitem>
841 <para>Turns on memory allocation checking when linked to</para>
842 <indexterm zone="ch-system-glibc libmcheck">
843 <primary sortas="c-libmcheck">libmcheck</primary>
844 </indexterm>
845 </listitem>
846 </varlistentry>
847
848 <varlistentry id="libmemusage">
849 <term><filename class="libraryfile">libmemusage</filename></term>
850 <listitem>
851 <para>Used by <command>memusage</command> to help collect
852 information about the memory usage of a program</para>
853 <indexterm zone="ch-system-glibc libmemusage">
854 <primary sortas="c-libmemusage">libmemusage</primary>
855 </indexterm>
856 </listitem>
857 </varlistentry>
858
859 <varlistentry id="libnsl">
860 <term><filename class="libraryfile">libnsl</filename></term>
861 <listitem>
862 <para>The network services library</para>
863 <indexterm zone="ch-system-glibc libnsl">
864 <primary sortas="c-libnsl">libnsl</primary>
865 </indexterm>
866 </listitem>
867 </varlistentry>
868
869 <varlistentry id="libnss">
870 <term><filename class="libraryfile">libnss</filename></term>
871 <listitem>
872 <para>The Name Service Switch libraries, containing functions for
873 resolving host names, user names, group names, aliases, services,
874 protocols, etc.</para>
875 <indexterm zone="ch-system-glibc libnss">
876 <primary sortas="c-libnss">libnss</primary>
877 </indexterm>
878 </listitem>
879 </varlistentry>
880
881 <varlistentry id="libpcprofile">
882 <term><filename class="libraryfile">libpcprofile</filename></term>
883 <listitem>
884 <para>Contains profiling functions used to track the amount of CPU
885 time spent in specific source code lines</para>
886 <indexterm zone="ch-system-glibc libpcprofile">
887 <primary sortas="c-libpcprofile">libpcprofile</primary>
888 </indexterm>
889 </listitem>
890 </varlistentry>
891
892 <varlistentry id="libpthread">
893 <term><filename class="libraryfile">libpthread</filename></term>
894 <listitem>
895 <para>The POSIX threads library</para>
896 <indexterm zone="ch-system-glibc libpthread">
897 <primary sortas="c-libpthread">libpthread</primary>
898 </indexterm>
899 </listitem>
900 </varlistentry>
901
902 <varlistentry id="libresolv">
903 <term><filename class="libraryfile">libresolv</filename></term>
904 <listitem>
905 <para>Contains functions for creating, sending, and interpreting
906 packets to the Internet domain name servers</para>
907 <indexterm zone="ch-system-glibc libresolv">
908 <primary sortas="c-libresolv">libresolv</primary>
909 </indexterm>
910 </listitem>
911 </varlistentry>
912
913 <varlistentry id="librpcsvc">
914 <term><filename class="libraryfile">librpcsvc</filename></term>
915 <listitem>
916 <para>Contains functions providing miscellaneous RPC services</para>
917 <indexterm zone="ch-system-glibc librpcsvc">
918 <primary sortas="c-librpcsvc">librpcsvc</primary>
919 </indexterm>
920 </listitem>
921 </varlistentry>
922
923 <varlistentry id="librt">
924 <term><filename class="libraryfile">librt</filename></term>
925 <listitem>
926 <para>Contains functions providing most of the interfaces specified
927 by the POSIX.1b Realtime Extension</para>
928 <indexterm zone="ch-system-glibc librt">
929 <primary sortas="c-librt">librt</primary>
930 </indexterm>
931 </listitem>
932 </varlistentry>
933
934 <varlistentry id="libthread_db">
935 <term><filename class="libraryfile">libthread_db</filename></term>
936 <listitem>
937 <para>Contains functions useful for building debuggers for
938 multi-threaded programs</para>
939 <indexterm zone="ch-system-glibc libthread_db">
940 <primary sortas="c-libthread_db">libthread_db</primary>
941 </indexterm>
942 </listitem>
943 </varlistentry>
944
945 <varlistentry id="libutil">
946 <term><filename class="libraryfile">libutil</filename></term>
947 <listitem>
948 <para>Contains code for <quote>standard</quote> functions used in
949 many different Unix utilities</para>
950 <indexterm zone="ch-system-glibc libutil">
951 <primary sortas="c-libutil">libutil</primary>
952 </indexterm>
953 </listitem>
954 </varlistentry>
955
956 </variablelist>
957
958 </sect2>
959
960</sect1>
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