Ignore:
Timestamp:
12/21/2004 07:38:32 PM (19 years ago)
Author:
Manuel Canales Esparcia <manuel@…>
Branches:
10.0, 10.0-rc1, 10.1, 10.1-rc1, 11.0, 11.0-rc1, 11.0-rc2, 11.0-rc3, 11.1, 11.1-rc1, 11.2, 11.2-rc1, 11.3, 11.3-rc1, 12.0, 12.0-rc1, 12.1, 12.1-rc1, 6.1, 6.1.1, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.5-systemd, 7.6, 7.6-systemd, 7.7, 7.7-systemd, 7.8, 7.8-systemd, 7.9, 7.9-systemd, 8.0, 8.1, 8.2, 8.3, 8.4, 9.0, 9.1, arm, bdubbs/gcc13, ml-11.0, multilib, renodr/libudev-from-systemd, s6-init, trunk, xry111/arm64, xry111/arm64-12.0, xry111/clfs-ng, xry111/lfs-next, xry111/loongarch, xry111/loongarch-12.0, xry111/loongarch-12.1, xry111/mips64el, xry111/pip3, xry111/rust-wip-20221008, xry111/update-glibc
Children:
3d36131c
Parents:
aaa3260
Message:

Removed the text in chapter 06.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@4446 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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  • chapter06/glibc.xml

    raaa3260 r3f0c882  
    1111
    1212<sect2 role="package"><title/>
    13 <para>The Glibc package contains the main C library. This library provides all
    14 the basic routines for allocating memory, searching directories, opening and
    15 closing files, reading and writing them, string handling, pattern matching,
    16 arithmetic, and so on.</para>
    1713
    1814<segmentedlist>
    … …  
    2218</segmentedlist>
    2319
    24 <segmentedlist>
    25 <segtitle>Glibc installation depends on</segtitle>
    26 <seglistitem><seg>Bash, Binutils, Coreutils, Diffutils,
    27 Gawk, GCC, Gettext, Grep, Make, Perl, Sed, Texinfo</seg></seglistitem>
    28 </segmentedlist>
    2920</sect2>
    3021
    … …  
    3223<title>Installation of Glibc</title>
    3324
    34 <para>The Glibc build system is very well self-contained and will install
    35 perfectly, even though our compiler specs file and linker are still pointing
    36 at <filename class="directory">/tools</filename>. We cannot adjust the specs and linker before
    37 the Glibc install, because the Glibc autoconf tests would then give bogus
    38 results and thus defeat our goal of achieving a clean build.</para>
    39 
    40 <para>Before starting to build Glibc, remember to unset any environment
    41 variables that override the default optimization flags.</para>
    42 
    43 <para>The Glibc documentation recommends building Glibc outside of the source
    44 directory in a dedicated build directory:</para>
     25<para>Create a build directory:</para>
    4526
    4627<screen><userinput>mkdir ../glibc-build
    … …  
    5435    --libexecdir=/usr/lib/glibc</userinput></screen>
    5536
    56 <para>The meaning of the new configure options:</para>
    57 
    58 <variablelist>
    59 <varlistentry>
    60 <term><parameter>--libexecdir=/usr/lib/glibc</parameter></term>
    61 <listitem><para>This changes the location of the <command>pt_chown</command>
    62 program from its default of <filename class="directory">/usr/libexec</filename> to
    63 <filename class="directory">/usr/lib/glibc</filename>.</para></listitem>
    64 </varlistentry>
    65 </variablelist>
    66 
    6737<para>Compile the package:</para>
    6838
    6939<screen><userinput>make</userinput></screen>
    70 
    71 <important><para>The test suite for Glibc in this section is considered
    72 <emphasis>critical</emphasis>. Our advice is to not skip it under any
    73 circumstance.</para></important>
    7440
    7541<para>Test the results:</para>
    … …  
    7844
    7945<para>The Glibc test suite is highly dependent on certain functions of your host
    80 system, in particular the kernel.  In general, the Glibc test suite is always
    81 expected to pass. However, in certain circumstances some failures are
    82 unavoidable. Here is a list of the most common issues we are aware of:</para>
     46system. See testing for explanations.</para>
    8347
    84 <itemizedlist>
    85 <listitem><para>The <emphasis>math</emphasis> tests sometimes fail when running
    86 on systems where the CPU is not a relatively new genuine Intel or authentic AMD.
    87 Certain optimization settings are also known to be a factor here.</para></listitem>
    88 
    89 <listitem><para>The <emphasis>gettext</emphasis> test sometimes fails due to
    90 host system issues. The exact reasons are not yet clear.</para></listitem>
    91 
    92 <listitem><para>The <emphasis>atime</emphasis> test sometimes fails when the
    93 LFS partition is mounted with the <parameter>noatime</parameter> option, or due
    94 to other file system quirks.</para></listitem>
    95 
    96 <listitem><para>The <emphasis>shm</emphasis> test might fail when the host
    97 system is running the devfs file system but doesn't have the <systemitem class="filesystem">tmpfs</systemitem> file system
    98 mounted at <filename class="directory">/dev/shm</filename> due to lack of support for tmpfs in
    99 the kernel.</para></listitem>
    100 
    101 <listitem><para>When running on older and slower hardware, some tests might
    102 fail due to test timeouts being exceeded.</para></listitem>
    103 </itemizedlist>
    104 
    105 <para>Though it is a harmless message, the install stage of Glibc will
    106 complain about the absence of <filename>/etc/ld.so.conf</filename>. Fix this
    107 annoying little warning with:</para>
     48<para>Fix an annoying little warning with:</para>
    10849
    10950<screen><userinput>touch /etc/ld.so.conf</userinput></screen>
    … …  
    11354<screen><userinput>make install</userinput></screen>
    11455
    115 <para>The locales that can make your system respond in a different language
    116 weren't installed by the above command. Do it with this:</para>
     56<para>To install the Glibc locales, use the following
     57command:</para>
    11758
    11859<screen><userinput>make localedata/install-locales</userinput></screen>
    11960
    12061<para>An alternative to running the previous command is to install only those
    121 locales which you need or want. This can be achieved by using the
    122 <command>localedef</command> command. Information on this can be found in
    123 the <filename>INSTALL</filename> file in the Glibc source. However, there are
    124 a number of locales that are essential for the tests of future packages to
    125 pass, in particular, the <emphasis>libstdc++</emphasis> tests from GCC. The
    126 following instructions, instead of the install-locales target above, will
    127 install the minimum set of locales necessary for the tests to run
    128 successfully:</para>
     62locales which you need or want. The following instructions, instead of the
     63install-locales target above, will install the minimum set of locales necessary
     64for the tests to run successfully:</para>
    12965
    130 <screen><userinput>mkdir -p /usr/lib/locale
     66<screen><userinput>mkdir -p /tools/lib/locale
    13167localedef -i de_DE -f ISO-8859-1 de_DE
    13268localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
    … …  
    14177localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
    14278
    143 <para>In fact, some locales installed by the
    144 <command>make localedata/install-locales</command>
    145 command above are not properly
    146 supported by some applications that are in LFS and BLFS books. Because
    147 of various problems that arise
    148 due to application programmers making
    149 assumptions that break in such locales, LFS <emphasis>should not</emphasis>
    150 be used in locales that utilize
    151 multibyte character sets (including UTF-8) or
    152 right-to-left writing order.
    153 Numerous unofficial and unstable patches are required to fix these problems,
    154 and it has been decided not to support such complex locales.
    155 This applies to the ja_JP and fa_IR locales as well:
    156 they have been installed only
    157 for GCC and Gettext tests to pass, and e.g.
    158 the <command>watch</command> program (part of Procps)
    159 compiled according to this book doesn't work properly in them.
    160 Various attempts to circumvent these
    161 restrictions are documented in internationalization-related hints.</para>
    162 
    163 <para>Finally, build the linuxthreads man pages, which are a great reference
    164 on the threading API (applicable to NPTL as well):</para>
     79<para>Build the linuxthreads man pages:</para>
    16580
    16681<screen><userinput>make -C ../glibc-&glibc-version;/linuxthreads/man</userinput></screen>
    … …  
    17489
    17590<sect2 id="conf-glibc" role="configuration"><title>Configuring Glibc</title>
    176 <indexterm zone="conf-glibc"><primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary></indexterm>
    177 <indexterm zone="conf-glibc"><primary sortas="e-/etc/localtime">/etc/localtime</primary></indexterm>
    178 
    179 <para>We need to create the <filename>/etc/nsswitch.conf</filename> file,
    180 because, although Glibc provides defaults when this file is missing or corrupt,
    181 the Glibc defaults don't work well with networking. Also, our time zone needs
    182 to be set up.</para>
    18391
    18492<para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
    … …  
    207115<screen><userinput>tzselect</userinput></screen>
    208116
    209 <para>When you've answered a few questions about your location, the script will
    210 output the name of your time zone, something like <emphasis>EST5EDT</emphasis>
    211 or <emphasis>Canada/Eastern</emphasis>. Then create the
    212 <filename>/etc/localtime</filename> file by running:</para>
     117<para>Then create the <filename>/etc/localtime</filename> file by running:</para>
    213118
    214 <screen><userinput>cp --remove-destination /usr/share/zoneinfo/Canada/Eastern /etc/localtime</userinput></screen>
    215 
    216 <para>The meaning of the option:</para>
    217 
    218 <variablelist>
    219 <varlistentry>
    220 <term><parameter>--remove-destination</parameter></term>
    221 <listitem><para>This is needed to force removal of the already existing symbolic
    222 link. The reason why we copy instead of symlink is to cover the situation where
    223 <filename class="directory">/usr</filename> is on a separate partition. This could matter, for
    224 example, when booted into single user mode.</para></listitem>
    225 </varlistentry>
    226 </variablelist>
    227 
    228 <para>Of course, instead of <emphasis>Canada/Eastern</emphasis>, fill in
    229 the name of the time zone that the <command>tzselect</command> script
    230 gave you.</para>
     119<screen><userinput>cp --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
     120    /etc/localtime</userinput></screen>
    231121
    232122</sect2>
    … …  
    235125<sect2 id="conf-ld" role="configuration">
    236126<title>Configuring Dynamic Loader</title>
    237 <indexterm zone="conf-ld"><primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary></indexterm>
    238 
    239 <para>By default, the dynamic loader
    240 (<filename class="libraryfile">/lib/ld-linux.so.2</filename>) searches through <filename
    241 class="directory">/lib</filename> and <filename class="directory">/usr/lib</filename>
    242 for dynamic libraries that are needed
    243 by programs when you run them. However, if there are libraries in
    244 directories other than <filename class="directory">/lib</filename> and
    245 <filename class="directory">/usr/lib</filename>, you need to add them to
    246 the <filename>/etc/ld.so.conf</filename> file for the dynamic
    247 loader to find them. Two directories that are commonly known to contain
    248 additional libraries are <filename class="directory">/usr/local/lib</filename>
    249 and <filename class="directory">/opt/lib</filename>, so we add those directories to the
    250 dynamic loader's search path.</para>
    251127
    252128<para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
    … …  
    267143<sect2 id="contents-glibc" role="content"><title>Contents of Glibc</title>
    268144
    269 <segmentedlist>
    270 <segtitle>Installed programs</segtitle>
    271 <segtitle>Installed libraries</segtitle>
    272 <seglistitem><seg>catchsegv, gencat, getconf,
    273 getent, glibcbug, iconv, iconvconfig, ldconfig, ldd, lddlibc4, locale,
    274 localedef, mtrace, nscd, nscd_nischeck, pcprofiledump, pt_chown, rpcgen,
    275 rpcinfo, sln, sprof, tzselect, xtrace, zdump and zic</seg>
    276 <seg>ld.so, libBrokenLocale.[a,so],
    277 libSegFault.so, libanl.[a,so], libbsd-compat.a, libc.[a,so], libc_nonshared.a,
    278 libcrypt.[a,so], libdl.[a,so], libg.a, libieee.a, libm.[a,so], libmcheck.a,
    279 libmemusage.so, libnsl.a, libnss_compat.so, libnss_dns.so, libnss_files.so,
    280 libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so, libpcprofile.so,
    281 libpthread.[a,so], libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so
    282 and libutil.[a,so]</seg></seglistitem>
    283 </segmentedlist>
    284 
    285 <variablelist><title>Short descriptions</title>
    286 
    287 <varlistentry id="catchsegv">
    288 <term><command>catchsegv</command></term>
    289 <listitem>
    290 <indexterm zone="ch-system-glibc catchsegv"><primary sortas="b-catchsegv">catchsegv</primary></indexterm>
    291 <para>can be used to create a stack trace
    292 when a program terminates with a segmentation fault.</para>
    293 </listitem>
    294 </varlistentry>
    295 
    296 <varlistentry id="gencat">
    297 <term><command>gencat</command></term>
    298 <listitem>
    299 <indexterm zone="ch-system-glibc gencat"><primary sortas="b-gencat">gencat</primary></indexterm>
    300 <para>generates message catalogues.</para>
    301 </listitem>
    302 </varlistentry>
    303 
    304 <varlistentry id="getconf">
    305 <term><command>getconf</command></term>
    306 <listitem>
    307 <indexterm zone="ch-system-glibc getconf"><primary sortas="b-getconf">getconf</primary></indexterm>
    308 <para>displays the system configuration values for file system specific variables.</para>
    309 </listitem>
    310 </varlistentry>
    311 
    312 <varlistentry id="getent">
    313 <term><command>getent</command></term>
    314 <listitem>
    315 <indexterm zone="ch-system-glibc getent"><primary sortas="b-getent">getent</primary></indexterm>
    316 <para>gets entries from an administrative database.</para>
    317 </listitem>
    318 </varlistentry>
    319 
    320 <varlistentry id="glibcbug">
    321 <term><command>glibcbug</command></term>
    322 <listitem>
    323 <indexterm zone="ch-system-glibc glibcbug"><primary sortas="b-glibcbug">glibcbug</primary></indexterm>
    324 <para>creates a bug report and mails it to the bug email address.</para>
    325 </listitem>
    326 </varlistentry>
    327 
    328 <varlistentry id="iconv">
    329 <term><command>iconv</command></term>
    330 <listitem>
    331 <indexterm zone="ch-system-glibc iconv"><primary sortas="b-iconv">iconv</primary></indexterm>
    332 <para>performs character set conversion.</para>
    333 </listitem>
    334 </varlistentry>
    335 
    336 <varlistentry id="iconvconfig">
    337 <term><command>iconvconfig</command></term>
    338 <listitem>
    339 <indexterm zone="ch-system-glibc iconvconfig"><primary sortas="b-iconvconfig">iconvconfig</primary></indexterm>
    340 <para>creates fastloading <command>iconv</command> module configuration file.</para>
    341 </listitem>
    342 </varlistentry>
    343 
    344 <varlistentry id="ldconfig">
    345 <term><command>ldconfig</command></term>
    346 <listitem>
    347 <indexterm zone="ch-system-glibc ldconfig"><primary sortas="b-ldconfig">ldconfig</primary></indexterm>
    348 <para>configures the dynamic linker runtime bindings.</para>
    349 </listitem>
    350 </varlistentry>
    351 
    352 <varlistentry id="ldd">
    353 <term><command>ldd</command></term>
    354 <listitem>
    355 <indexterm zone="ch-system-glibc ldd"><primary sortas="b-ldd">ldd</primary></indexterm>
    356 <para>reports which shared libraries are required
    357 by each given program or shared library.</para>
    358 </listitem>
    359 </varlistentry>
    360 
    361 <varlistentry id="lddlibc4">
    362 <term><command>lddlibc4</command></term>
    363 <listitem>
    364 <indexterm zone="ch-system-glibc lddlibc4"><primary sortas="b-lddlibc4">lddlibc4</primary></indexterm>
    365 <para>assists <command>ldd</command> with object files.</para>
    366 </listitem>
    367 </varlistentry>
    368 
    369 <varlistentry id="locale">
    370 <term><command>locale</command></term>
    371 <listitem>
    372 <indexterm zone="ch-system-glibc locale"><primary sortas="b-locale">locale</primary></indexterm>
    373 <para>is a Perl program that tells the compiler
    374 to enable or disable the use of POSIX locales for built-in operations.</para>
    375 </listitem>
    376 </varlistentry>
    377 
    378 <varlistentry id="localedef">
    379 <term><command>localedef</command></term>
    380 <listitem>
    381 <indexterm zone="ch-system-glibc localedef"><primary sortas="b-localedef">localedef</primary></indexterm>
    382 <para>compiles locale specifications.</para>
    383 </listitem>
    384 </varlistentry>
    385 
    386 <varlistentry id="mtrace">
    387 <term><command>mtrace</command></term>
    388 <listitem>
    389 <indexterm zone="ch-system-glibc mtrace"><primary sortas="b-mtrace">mtrace</primary></indexterm>
    390 <para>...</para>
    391 </listitem>
    392 </varlistentry>
    393 
    394 <varlistentry id="nscd">
    395 <term><command>nscd</command></term>
    396 <listitem>
    397 <indexterm zone="ch-system-glibc nscd"><primary sortas="b-nscd">nscd</primary></indexterm>
    398 <para>is a name service cache daemon providing a
    399 cache for the most common name service requests.</para>
    400 </listitem>
    401 </varlistentry>
    402 
    403 <varlistentry id="nscd_nischeck">
    404 <term><command>nscd_nischeck</command></term>
    405 <listitem>
    406 <indexterm zone="ch-system-glibc nscd_nischeck"><primary sortas="b-nscd_nischeck">nscd_nischeck</primary></indexterm>
    407 <para>checks whether or not secure mode is necessary for NIS+ lookup.</para>
    408 </listitem>
    409 </varlistentry>
    410 
    411 <varlistentry id="pcprofiledump">
    412 <term><command>pcprofiledump</command></term>
    413 <listitem>
    414 <indexterm zone="ch-system-glibc pcprofiledump"><primary sortas="b-pcprofiledump">pcprofiledump</primary></indexterm>
    415 <para>dumps information generated by PC profiling.</para>
    416 </listitem>
    417 </varlistentry>
    418 
    419 <varlistentry id="pt_chown">
    420 <term><command>pt_chown</command></term>
    421 <listitem>
    422 <indexterm zone="ch-system-glibc pt_chown"><primary sortas="b-pt_chown">pt_chown</primary></indexterm>
    423 <para>is a helper program for grantpt to set
    424 the owner, group and access permissions of a slave pseudo terminal.</para>
    425 </listitem>
    426 </varlistentry>
    427 
    428 <varlistentry id="rpcgen">
    429 <term><command>rpcgen</command></term>
    430 <listitem>
    431 <indexterm zone="ch-system-glibc rpcgen"><primary sortas="b-rpcgen">rpcgen</primary></indexterm>
    432 <para>generates C code to implement the RPC protocol.</para>
    433 </listitem>
    434 </varlistentry>
    435 
    436 <varlistentry id="rpcinfo">
    437 <term><command>rpcinfo</command></term>
    438 <listitem>
    439 <indexterm zone="ch-system-glibc rpcinfo"><primary sortas="b-rpcinfo">rpcinfo</primary></indexterm>
    440 <para>makes an RPC call to an RPC server.</para>
    441 </listitem>
    442 </varlistentry>
    443 
    444 <varlistentry id="sln">
    445 <term><command>sln</command></term>
    446 <listitem>
    447 <indexterm zone="ch-system-glibc sln"><primary sortas="b-sln">sln</primary></indexterm>
    448 <para>is used to make symbolic links. The program
    449 is statically linked, so it is useful for making symbolic links to dynamic
    450 libraries if the dynamic linking system for some reason is nonfunctional.</para>
    451 </listitem>
    452 </varlistentry>
    453 
    454 <varlistentry id="sprof">
    455 <term><command>sprof</command></term>
    456 <listitem>
    457 <indexterm zone="ch-system-glibc sprof"><primary sortas="b-sprof">sprof</primary></indexterm>
    458 <para>reads and displays shared object profiling data.</para>
    459 </listitem>
    460 </varlistentry>
    461 
    462 <varlistentry id="tzselect">
    463 <term><command>tzselect</command></term>
    464 <listitem>
    465 <indexterm zone="ch-system-glibc tzselect"><primary sortas="b-tzselect">tzselect</primary></indexterm>
    466 <para>asks the user about the location of the
    467 system and reports the corresponding time zone description.</para>
    468 </listitem>
    469 </varlistentry>
    470 
    471 <varlistentry id="xtrace">
    472 <term><command>xtrace</command></term>
    473 <listitem>
    474 <indexterm zone="ch-system-glibc xtrace"><primary sortas="b-xtrace">xtrace</primary></indexterm>
    475 <para>traces the execution of a program by
    476 printing the currently executed function.</para>
    477 </listitem>
    478 </varlistentry>
    479 
    480 <varlistentry id="zdump">
    481 <term><command>zdump</command></term>
    482 <listitem>
    483 <indexterm zone="ch-system-glibc zdump"><primary sortas="b-zdump">zdump</primary></indexterm>
    484 <para>is the time zone dumper.</para>
    485 </listitem>
    486 </varlistentry>
    487 
    488 <varlistentry id="zic">
    489 <term><command>zic</command></term>
    490 <listitem>
    491 <indexterm zone="ch-system-glibc zic"><primary sortas="b-zic">zic</primary></indexterm>
    492 <para>is the time zone compiler.</para>
    493 </listitem>
    494 </varlistentry>
    495 
    496 <varlistentry id="ld.so">
    497 <term><filename class="libraryfile">ld.so</filename></term>
    498 <listitem>
    499 <indexterm zone="ch-system-glibc ld.so"><primary sortas="c-ld.so">ld.so</primary></indexterm>
    500 <para>is the helper program for shared library executables.</para>
    501 </listitem>
    502 </varlistentry>
    503 
    504 <varlistentry id="libBrokenLocale">
    505 <term><filename class="libraryfile">libBrokenLocale</filename></term>
    506 <listitem>
    507 <indexterm zone="ch-system-glibc libBrokenLocale"><primary sortas="c-libBrokenLocale">libBrokenLocale</primary></indexterm>
    508 <para>is used by programs, such as Mozilla, to solve broken locales.</para>
    509 </listitem>
    510 </varlistentry>
    511 
    512 <varlistentry id="libSegFault">
    513 <term><filename class="libraryfile">libSegFault</filename></term>
    514 <listitem>
    515 <indexterm zone="ch-system-glibc libSegFault"><primary sortas="c-libSegFault">libSegFault</primary></indexterm>
    516 <para>is a segmentation fault signal handler. It tries to catch segfaults.</para>
    517 </listitem>
    518 </varlistentry>
    519 
    520 <varlistentry id="libanl">
    521 <term><filename class="libraryfile">libanl</filename></term>
    522 <listitem>
    523 <indexterm zone="ch-system-glibc libanl"><primary sortas="c-libanl">libanl</primary></indexterm>
    524 <para>is an asynchronous name lookup library.</para>
    525 </listitem>
    526 </varlistentry>
    527 
    528 <varlistentry id="libbsd-compat">
    529 <term><filename class="libraryfile">libbsd-compat</filename></term>
    530 <listitem>
    531 <indexterm zone="ch-system-glibc libbsd-compat"><primary sortas="c-libbsd-compat">libbsd-compat</primary></indexterm>
    532 <para>provides the portability needed
    533 in order to run certain BSD programs under Linux.</para>
    534 </listitem>
    535 </varlistentry>
    536 
    537 <varlistentry id="libc">
    538 <term><filename class="libraryfile">libc</filename></term>
    539 <listitem>
    540 <indexterm zone="ch-system-glibc libc"><primary sortas="c-libc">libc</primary></indexterm>
    541 <para>is the main C library -- a collection of commonly used functions.</para>
    542 </listitem>
    543 </varlistentry>
    544 
    545 <varlistentry id="libcrypt">
    546 <term><filename class="libraryfile">libcrypt</filename></term>
    547 <listitem>
    548 <indexterm zone="ch-system-glibc libcrypt"><primary sortas="c-libcrypt">libcrypt</primary></indexterm>
    549 <para>is the cryptography library.</para>
    550 </listitem>
    551 </varlistentry>
    552 
    553 <varlistentry id="libdl">
    554 <term><filename class="libraryfile">libdl</filename></term>
    555 <listitem>
    556 <indexterm zone="ch-system-glibc libdl"><primary sortas="c-libdl">libdl</primary></indexterm>
    557 <para>is the dynamic linking interface library.</para>
    558 </listitem>
    559 </varlistentry>
    560 
    561 <varlistentry id="libg">
    562 <term><filename class="libraryfile">libg</filename></term>
    563 <listitem>
    564 <indexterm zone="ch-system-glibc libg"><primary sortas="c-libg">libg</primary></indexterm>
    565 <para>is a runtime library for <command>g++</command>.</para>
    566 </listitem>
    567 </varlistentry>
    568 
    569 <varlistentry id="libieee">
    570 <term><filename class="libraryfile">libieee</filename></term>
    571 <listitem>
    572 <indexterm zone="ch-system-glibc libieee"><primary sortas="c-libieee">libieee</primary></indexterm>
    573 <para>is the IEEE floating point library.</para>
    574 </listitem>
    575 </varlistentry>
    576 
    577 <varlistentry id="libm">
    578 <term><filename class="libraryfile">libm</filename></term>
    579 <listitem>
    580 <indexterm zone="ch-system-glibc libm"><primary sortas="c-libm">libm</primary></indexterm>
    581 <para>is the mathematical library.</para>
    582 </listitem>
    583 </varlistentry>
    584 
    585 <varlistentry id="libmcheck">
    586 <term><filename class="libraryfile">libmcheck</filename></term>
    587 <listitem>
    588 <indexterm zone="ch-system-glibc libmcheck"><primary sortas="c-libmcheck">libmcheck</primary></indexterm>
    589 <para>contains code run at boot.</para>
    590 </listitem>
    591 </varlistentry>
    592 
    593 <varlistentry id="libmemusage">
    594 <term><filename class="libraryfile">libmemusage</filename></term>
    595 <listitem>
    596 <indexterm zone="ch-system-glibc libmemusage"><primary sortas="c-libmemusage">libmemusage</primary></indexterm>
    597 <para>is used by <command>memusage</command> to help collect
    598 information about the memory usage of a program.</para>
    599 </listitem>
    600 </varlistentry>
    601 
    602 <varlistentry id="libnsl">
    603 <term><filename class="libraryfile">libnsl</filename></term>
    604 <listitem>
    605 <indexterm zone="ch-system-glibc libnsl"><primary sortas="c-libnsl">libnsl</primary></indexterm>
    606 <para>is the network services library.</para>
    607 </listitem>
    608 </varlistentry>
    609 
    610 <varlistentry id="libnss">
    611 <term><filename class="libraryfile">libnss*</filename></term>
    612 <listitem>
    613 <indexterm zone="ch-system-glibc libnss"><primary sortas="c-libnss*">libnss*</primary></indexterm>
    614 <para>are the Name Service Switch libraries,
    615 containing functions for resolving host names, user names, group names,
    616 aliases, services, protocols, and the like.</para>
    617 </listitem>
    618 </varlistentry>
    619 
    620 <varlistentry id="libpcprofile">
    621 <term><filename class="libraryfile">libpcprofile</filename></term>
    622 <listitem>
    623 <indexterm zone="ch-system-glibc libpcprofile"><primary sortas="c-libpcprofile">libpcprofile</primary></indexterm>
    624 <para>contains profiling functions used
    625 to track the amount of CPU time spent in which source code lines.</para>
    626 </listitem>
    627 </varlistentry>
    628 
    629 <varlistentry id="libpthread">
    630 <term><filename class="libraryfile">libpthread</filename></term>
    631 <listitem>
    632 <indexterm zone="ch-system-glibc libpthread"><primary sortas="c-libpthread">libpthread</primary></indexterm>
    633 <para>is the POSIX threads library.</para>
    634 </listitem>
    635 </varlistentry>
    636 
    637 <varlistentry id="libresolv">
    638 <term><filename class="libraryfile">libresolv</filename></term>
    639 <listitem>
    640 <indexterm zone="ch-system-glibc libresolv"><primary sortas="c-libresolv">libresolv</primary></indexterm>
    641 <para>contains functions for creating,
    642 sending, and interpreting packets to the Internet domain name servers.</para>
    643 </listitem>
    644 </varlistentry>
    645 
    646 <varlistentry id="librpcsvc">
    647 <term><filename class="libraryfile">librpcsvc</filename></term>
    648 <listitem>
    649 <indexterm zone="ch-system-glibc librpcsvc"><primary sortas="c-librpcsvc">librpcsvc</primary></indexterm>
    650 <para>contains functions providing miscellaneous RPC services.</para>
    651 </listitem>
    652 </varlistentry>
    653 
    654 <varlistentry id="librt">
    655 <term><filename class="libraryfile">librt</filename></term>
    656 <listitem>
    657 <indexterm zone="ch-system-glibc librt"><primary sortas="c-librt">librt</primary></indexterm>
    658 <para>contains functions providing most of the
    659 interfaces specified by the POSIX.1b Realtime Extension.</para>
    660 </listitem>
    661 </varlistentry>
    662 
    663 <varlistentry id="libthread_db">
    664 <term><filename class="libraryfile">libthread_db</filename></term>
    665 <listitem>
    666 <indexterm zone="ch-system-glibc libthread_db"><primary sortas="c-libthread_db">libthread_db</primary></indexterm>
    667 <para>contains functions useful for
    668 building debuggers for multi-threaded programs.</para>
    669 </listitem>
    670 </varlistentry>
    671 
    672 <varlistentry id="libutil">
    673 <term><filename class="libraryfile">libutil</filename></term>
    674 <listitem>
    675 <indexterm zone="ch-system-glibc libutil"><primary sortas="c-libutil">libutil</primary></indexterm>
    676 <para>contains code for <quote>standard</quote> functions used in many different Unix utilities.</para>
    677 </listitem>
    678 </varlistentry>
    679 </variablelist>
     145<para>See testing</para>
    680146
    681147</sect2>
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