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Diffstat (limited to 'chapter06/glibc.xml')
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1 files changed, 563 insertions, 24 deletions
diff --git a/chapter06/glibc.xml b/chapter06/glibc.xml index c2bd6519c..8e7732795 100644 --- a/chapter06/glibc.xml +++ b/chapter06/glibc.xml @@ -3,13 +3,17 @@ <!ENTITY % general-entities SYSTEM "../general.ent"> %general-entities; ]> -<sect1 id="ch-system-glibc" xreflabel="Glibc" role="wrap"> +<sect1 id="ch-system-glibc" role="wrap"> <title>Glibc-&glibc-version;</title> <?dbhtml filename="glibc.html"?> <indexterm zone="ch-system-glibc"><primary sortas="a-Glibc">Glibc</primary></indexterm> <sect2 role="package"><title/> +<para>The Glibc package contains the main C library. This library provides +the basic routines for allocating memory, searching directories, opening and +closing files, reading and writing files, string handling, pattern matching, +arithmetic, and so on.</para> <segmentedlist> <segtitle>&buildtime;</segtitle> @@ -17,56 +21,131 @@ <seglistitem><seg>12.3 SBU</seg><seg>784 MB</seg></seglistitem> </segmentedlist> +<segmentedlist> +<segtitle>Glibc installation depends on</segtitle> +<seglistitem><seg>Bash, Binutils, Coreutils, Diffutils, +Gawk, GCC, Gettext, Grep, Make, Perl, Sed, and Texinfo</seg></seglistitem> +</segmentedlist> </sect2> <sect2 role="installation"> <title>Installation of Glibc</title> -<para>The linuxthreads tarball contains the man pages for the threading -libraries installed by glibc. Unpack the tarball from within the glibc source -directory:</para> +<para>This package is known to have issues when its default +optimization flags (including the <parameter>-march</parameter> and +<parameter>-mcpu</parameter> options) are changed. If any environment +variables that override default optimizations have been defined, such +as <envar>CFLAGS</envar> and <envar>CXXFLAGS</envar>, +unset them when building Glibc.</para> + +<para>The Glibc build system is self-contained and will install +perfectly, even though the compiler specs file and linker are still +pointing at <filename class="directory">/tools</filename>. The specs +and linker cannot be adjusted before the Glibc install because the +Glibc autoconf tests would give false results and defeat the goal +of achieving a clean build.</para> -<screen><userinput>tar xjvf ../glibc-linuxthreads-&glibc-version;.tar.bz2</userinput></screen> +<para>The linuxthreads tarball contains the man pages for the +threading libraries installed by glibc. Unpack the tarball from +within the glibc source directory:</para> -<para>Create a build directory:</para> +<screen><userinput>tar xjvf /sources/glibc-linuxthreads-&glibc-version;.tar.bz2</userinput></screen> + +<para>The Glibc documentation recommends building Glibc outside of the source +directory in a dedicated build directory:</para> <screen><userinput>mkdir ../glibc-build cd ../glibc-build</userinput></screen> -<para>Now prepare Glibc for compilation:</para> +<para>Prepare Glibc for compilation:</para> <screen><userinput>../glibc-&glibc-version;/configure --prefix=/usr \ --disable-profile --enable-add-ons \ --enable-kernel=2.6.0 --without-cvs \ --libexecdir=/usr/lib/glibc</userinput></screen> +<para>The meaning of the new configure option:</para> + +<variablelist> +<varlistentry> +<term><parameter>--libexecdir=/usr/lib/glibc</parameter></term> +<listitem><para>This changes the location of the +<command>pt_chown</command> program from its default of <filename +class="directory">/usr/libexec</filename> to <filename +class="directory">/usr/lib/glibc</filename>.</para></listitem> +</varlistentry> +</variablelist> + <para>Compile the package:</para> <screen><userinput>make</userinput></screen> +<important><para>In this section, the test suite for Glibc is +considered critical. Do not skip it under any +circumstance.</para></important> + <para>Test the results:</para> <screen><userinput>make check</userinput></screen> -<para>The Glibc test suite is highly dependent on certain functions of your host -system. See testing for explanations.</para> - -<para>Fix an annoying little warning with:</para> +<para>The Glibc test suite is highly dependent on certain functions of +the host system, in particular the kernel. In general, the Glibc test +suite is always expected to pass. However, in certain circumstances, +some failures are unavoidable. This is a list of the most common +issues:</para> + +<itemizedlist> +<listitem><para>The <emphasis>math</emphasis> tests sometimes fail when running +on systems where the CPU is not a relatively new genuine Intel or authentic AMD. +Certain optimization settings are also known to be a factor here.</para></listitem> + +<listitem><para>The <emphasis>gettext</emphasis> test sometimes fails due to +host system issues. The exact reasons are not yet clear.</para></listitem> + +<listitem><para>The <emphasis>atime</emphasis> test sometimes fails +when the LFS partition is mounted with the +<parameter>noatime</parameter> option.</para></listitem> + +<listitem><para>The <emphasis>shm</emphasis> test can fail when the +host system is using the <systemitem +class="filesystem">devfs</systemitem> file system but does not have +the <systemitem class="filesystem">tmpfs</systemitem> file system +mounted at <filename class="directory">/dev/shm</filename>. This +occurs because of a lack of support for <systemitem +class="filesystem">tmpfs</systemitem> in the +kernel.</para></listitem> + +<listitem><para>When running on older and slower hardware, some tests +can fail because of test timeouts being exceeded.</para></listitem> +</itemizedlist> + +<para>Though it is a harmless message, the install stage of Glibc will +complain about the absence of <filename>/etc/ld.so.conf</filename>. +Prevent this warning with:</para> <screen><userinput>touch /etc/ld.so.conf</userinput></screen> -<para>And install the package:</para> +<para>Install the package:</para> <screen><userinput>make install</userinput></screen> -<para>To install the Glibc locales, use the following -command:</para> +<para>The locales that can make the system respond in a different +language were not installed by the above command. Install this +with:</para> <screen><userinput>make localedata/install-locales</userinput></screen> -<para>An alternative to running the previous command is to install only those -locales which you need or want. The following instructions, instead of the -install-locales target above, will install the minimum set of locales necessary +<para>To save time, an alternative to running the +previous command (which generates and installs every locale Glibc is +aware of) is to install only those locales that are wanted and needed. +This can be achieved by using the <command>localedef</command> +command. Information on this command is located in the +<filename>INSTALL</filename> file in the Glibc source. However, there +are a number of locales that are essential in order for the tests of +future packages to pass, in particular, the +<emphasis>libstdc++</emphasis> tests from GCC. The following +instructions, instead of the <parameter>install-locales</parameter> +target used above, will install the minimum set of locales necessary for the tests to run successfully:</para> <screen><userinput>mkdir -p /usr/lib/locale @@ -82,18 +161,40 @@ localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro localedef -i it_IT -f ISO-8859-1 it_IT localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen> -<para>Build the linuxthreads man pages:</para> +<para>Some locales installed by the <command>make +localedata/install-locales</command> command above are not properly +supported by some applications that are in the LFS and BLFS books. +Because of the various problems that arise due to application +programmers making assumptions that break in such locales, LFS should +not be used in locales that utilize multibyte character sets +(including UTF-8) or right-to-left writing order. Numerous unofficial +and unstable patches are required to fix these problems, and it has +been decided by the LFS developers not to support such complex locales. This applies to the +ja_JP and fa_IR locales as well—they have been installed only for +GCC and Gettext tests to pass, and the <command>watch</command> program +(part of the Procps package) does not work properly in them. Various +attempts to circumvent these restrictions are documented in +internationalization-related hints.</para> + +<para>Build the linuxthreads man pages, which are a great reference +on the threading API (applicable to NPTL as well):</para> <screen><userinput>make -C ../glibc-&glibc-version;/linuxthreads/man</userinput></screen> -<para>And install these pages:</para> +<para>Install these pages:</para> <screen><userinput>make -C ../glibc-&glibc-version;/linuxthreads/man install</userinput></screen> </sect2> - <sect2 id="conf-glibc" role="configuration"><title>Configuring Glibc</title> +<indexterm zone="conf-glibc"><primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary></indexterm> +<indexterm zone="conf-glibc"><primary sortas="e-/etc/localtime">/etc/localtime</primary></indexterm> + +<para>The <filename>/etc/nsswitch.conf</filename> file needs to be +created because, although Glibc provides defaults when this file is +missing or corrupt, the Glibc defaults do not work well with +networking. The time zone also needs to be set up.</para> <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the following:</para> @@ -116,20 +217,56 @@ rpc: files # End /etc/nsswitch.conf</literal> EOF</userinput></screen> -<para>To find out what time zone you're in, run the following script:</para> +<para>To determine the local time zone, run the following script:</para> <screen><userinput>tzselect</userinput></screen> -<para>Then create the <filename>/etc/localtime</filename> file by running:</para> +<para>After answering a few questions about the location, the script +will output the name of the time zone (e.g., +<emphasis>EST5EDT</emphasis> or <emphasis>Canada/Eastern</emphasis>). +Then create the <filename>/etc/localtime</filename> file by +running:</para> <screen><userinput>cp --remove-destination /usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \ /etc/localtime</userinput></screen> +<para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone that the +<command>tzselect</command> provided (e.g., Canada/Eastern).</para> + +<para>The meaning of the cp option:</para> + +<variablelist> +<varlistentry> +<term><parameter>--remove-destination</parameter></term> +<listitem><para>This is needed to force removal of the already +existing symbolic link. The reason for copying the file instead of +using a symlink is to cover the situation where <filename +class="directory">/usr</filename> is on a separate partition. This +could be important when booted into single user +mode.</para></listitem> +</varlistentry> +</variablelist> + </sect2> <sect2 id="conf-ld" role="configuration"> <title>Configuring Dynamic Loader</title> +<indexterm zone="conf-ld"><primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary></indexterm> + +<para>By default, the dynamic loader (<filename +class="libraryfile">/lib/ld-linux.so.2</filename>) searches through +<filename class="directory">/lib</filename> and <filename +class="directory">/usr/lib</filename> for dynamic libraries that are +needed by programs as they are run. However, if there are libraries in +directories other than <filename class="directory">/lib</filename> and +<filename class="directory">/usr/lib</filename>, these need to be +added to the <filename>/etc/ld.so.conf</filename> file in order +for the dynamic loader to find them. Two directories that are commonly +known to contain additional libraries are <filename +class="directory">/usr/local/lib</filename> and <filename +class="directory">/opt/lib</filename>, so add those directories to the +dynamic loader's search path.</para> <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the following:</para> @@ -145,11 +282,413 @@ EOF</userinput></screen> </sect2> - <sect2 id="contents-glibc" role="content"><title>Contents of Glibc</title> -<para>See testing</para> +<segmentedlist> +<segtitle>Installed programs</segtitle> +<segtitle>Installed libraries</segtitle> +<seglistitem><seg>catchsegv, gencat, getconf, +getent, iconv, iconvconfig, ldconfig, ldd, lddlibc4, locale, +localedef, mtrace, nscd, nscd_nischeck, pcprofiledump, pt_chown, rpcgen, +rpcinfo, sln, sprof, tzselect, xtrace, zdump, and zic</seg> +<seg>ld.so, libBrokenLocale.[a,so], +libSegFault.so, libanl.[a,so], libbsd-compat.a, libc.[a,so], +libcrypt.[a,so], libdl.[a,so], libg.a, libieee.a, libm.[a,so], libmcheck.a, +libmemusage.so, libnsl.a, libnss_compat.so, libnss_dns.so, libnss_files.so, +libnss_hesiod.so, libnss_nis.so, libnss_nisplus.so, libpcprofile.so, +libpthread.[a,so], libresolv.[a,so], librpcsvc.a, librt.[a,so], +libthread_db.so, and libutil.[a,so]</seg></seglistitem> +</segmentedlist> + +<variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead> +<?dbfo list-presentation="list"?> + +<varlistentry id="catchsegv"> +<term><command>catchsegv</command></term> +<listitem> +<para>Can be used to create a stack trace when a program +terminates with a segmentation fault</para> +<indexterm zone="ch-system-glibc catchsegv"><primary sortas="b-catchsegv">catchsegv</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="gencat"> +<term><command>gencat</command></term> +<listitem> +<para>Generates message catalogues</para> +<indexterm zone="ch-system-glibc gencat"><primary sortas="b-gencat">gencat</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="getconf"> +<term><command>getconf</command></term> +<listitem> +<para>Displays the system configuration values for file system specific variables</para> +<indexterm zone="ch-system-glibc getconf"><primary sortas="b-getconf">getconf</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="getent"> +<term><command>getent</command></term> +<listitem> +<para>Gets entries from an administrative database</para> +<indexterm zone="ch-system-glibc getent"><primary sortas="b-getent">getent</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="iconv"> +<term><command>iconv</command></term> +<listitem> +<para>Performs character set conversion</para> +<indexterm zone="ch-system-glibc iconv"><primary sortas="b-iconv">iconv</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="iconvconfig"> +<term><command>iconvconfig</command></term> +<listitem> +<para>Creates fastloading <command>iconv</command> module configuration files</para> +<indexterm zone="ch-system-glibc iconvconfig"><primary sortas="b-iconvconfig">iconvconfig</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="ldconfig"> +<term><command>ldconfig</command></term> +<listitem> +<para>Configures the dynamic linker runtime bindings</para> +<indexterm zone="ch-system-glibc ldconfig"><primary sortas="b-ldconfig">ldconfig</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="ldd"> +<term><command>ldd</command></term> +<listitem> +<para>Reports which shared libraries are required +by each given program or shared library</para> +<indexterm zone="ch-system-glibc ldd"><primary sortas="b-ldd">ldd</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="lddlibc4"> +<term><command>lddlibc4</command></term> +<listitem> +<para>Assists <command>ldd</command> with object files</para> +<indexterm zone="ch-system-glibc lddlibc4"><primary sortas="b-lddlibc4">lddlibc4</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="locale"> +<term><command>locale</command></term> +<listitem> +<para>Tells the compiler to enable or disable the use of POSIX locales +for built-in operations</para> +<indexterm zone="ch-system-glibc locale"><primary sortas="b-locale">locale</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="localedef"> +<term><command>localedef</command></term> +<listitem> +<para>Compiles locale specifications</para> +<indexterm zone="ch-system-glibc localedef"><primary sortas="b-localedef">localedef</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="mtrace"> +<term><command>mtrace</command></term> +<listitem> +<para>Reads and interprets a memory trace file and +ouputs a summary in human-readable format</para> +<indexterm zone="ch-system-glibc mtrace"><primary sortas="b-mtrace">mtrace</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="nscd"> +<term><command>nscd</command></term> +<listitem> +<para>A daemon that provides a cache for the most common name +service requests</para> +<indexterm zone="ch-system-glibc nscd"><primary sortas="b-nscd">nscd</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="nscd_nischeck"> +<term><command>nscd_nischeck</command></term> +<listitem> +<para>Checks whether or not secure mode is necessary for NIS+ lookup</para> +<indexterm zone="ch-system-glibc nscd_nischeck"><primary sortas="b-nscd_nischeck">nscd_nischeck</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="pcprofiledump"> +<term><command>pcprofiledump</command></term> +<listitem> +<para>Dumps information generated by PC profiling</para> +<indexterm zone="ch-system-glibc pcprofiledump"><primary sortas="b-pcprofiledump">pcprofiledump</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="pt_chown"> +<term><command>pt_chown</command></term> +<listitem> +<para>A helper program for <command>grantpt</command> to set +the owner, group and access permissions of a slave pseudo terminal</para> +<indexterm zone="ch-system-glibc pt_chown"><primary sortas="b-pt_chown">pt_chown</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="rpcgen"> +<term><command>rpcgen</command></term> +<listitem> +<para>Generates C code to implement the Remote Procecure Call (RPC) protocol</para> +<indexterm zone="ch-system-glibc rpcgen"><primary sortas="b-rpcgen">rpcgen</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="rpcinfo"> +<term><command>rpcinfo</command></term> +<listitem> +<para>Makes an RPC call to an RPC server</para> +<indexterm zone="ch-system-glibc rpcinfo"><primary sortas="b-rpcinfo">rpcinfo</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="sln"> +<term><command>sln</command></term> +<listitem> +<para>A statically linked <command>ln</command> program</para> +<indexterm zone="ch-system-glibc sln"><primary sortas="b-sln">sln</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="sprof"> +<term><command>sprof</command></term> +<listitem> +<para>Reads and displays shared object profiling data</para> +<indexterm zone="ch-system-glibc sprof"><primary sortas="b-sprof">sprof</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="tzselect"> +<term><command>tzselect</command></term> +<listitem> +<para>Asks the user about the location of the +system and reports the corresponding time zone description</para> +<indexterm zone="ch-system-glibc tzselect"><primary sortas="b-tzselect">tzselect</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="xtrace"> +<term><command>xtrace</command></term> +<listitem> +<para>Traces the execution of a program by +printing the currently executed function</para> +<indexterm zone="ch-system-glibc xtrace"><primary sortas="b-xtrace">xtrace</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="zdump"> +<term><command>zdump</command></term> +<listitem> +<para>The time zone dumper</para> +<indexterm zone="ch-system-glibc zdump"><primary sortas="b-zdump">zdump</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="zic"> +<term><command>zic</command></term> +<listitem> +<para>The time zone compiler</para> +<indexterm zone="ch-system-glibc zic"><primary sortas="b-zic">zic</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="ld.so"> +<term><filename class="libraryfile">ld.so</filename></term> +<listitem> +<para>The helper program for shared library executables</para> +<indexterm zone="ch-system-glibc ld.so"><primary sortas="c-ld.so">ld.so</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libBrokenLocale"> +<term><filename class="libraryfile">libBrokenLocale</filename></term> +<listitem> +<para>Used by programs, such as Mozilla, to solve broken locales</para> +<indexterm zone="ch-system-glibc libBrokenLocale"><primary sortas="c-libBrokenLocale">libBrokenLocale</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libSegFault"> +<term><filename class="libraryfile">libSegFault</filename></term> +<listitem> +<para>The segmentation fault signal handler</para> +<indexterm zone="ch-system-glibc libSegFault"><primary sortas="c-libSegFault">libSegFault</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libanl"> +<term><filename class="libraryfile">libanl</filename></term> +<listitem> +<para>An asynchronous name lookup library</para> +<indexterm zone="ch-system-glibc libanl"><primary sortas="c-libanl">libanl</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libbsd-compat"> +<term><filename class="libraryfile">libbsd-compat</filename></term> +<listitem> +<para>Provides the portability needed +in order to run certain Berkey Software Distribution (BSD) programs under Linux</para> +<indexterm zone="ch-system-glibc libbsd-compat"><primary sortas="c-libbsd-compat">libbsd-compat</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libc"> +<term><filename class="libraryfile">libc</filename></term> +<listitem> +<para>The main C library</para> +<indexterm zone="ch-system-glibc libc"><primary sortas="c-libc">libc</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libcrypt"> +<term><filename class="libraryfile">libcrypt</filename></term> +<listitem> +<para>The cryptography library</para> +<indexterm zone="ch-system-glibc libcrypt"><primary sortas="c-libcrypt">libcrypt</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libdl"> +<term><filename class="libraryfile">libdl</filename></term> +<listitem> +<para>The dynamic linking interface library</para> +<indexterm zone="ch-system-glibc libdl"><primary sortas="c-libdl">libdl</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libg"> +<term><filename class="libraryfile">libg</filename></term> +<listitem> +<para>A runtime library for <command>g++</command></para> +<indexterm zone="ch-system-glibc libg"><primary sortas="c-libg">libg</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libieee"> +<term><filename class="libraryfile">libieee</filename></term> +<listitem> +<para>The Institute of Electrical and Electronic Engineers (IEEE) floating point library</para> +<indexterm zone="ch-system-glibc libieee"><primary sortas="c-libieee">libieee</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libm"> +<term><filename class="libraryfile">libm</filename></term> +<listitem> +<para>The mathematical library</para> +<indexterm zone="ch-system-glibc libm"><primary sortas="c-libm">libm</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libmcheck"> +<term><filename class="libraryfile">libmcheck</filename></term> +<listitem> +<para>Contains code run at boot</para> +<indexterm zone="ch-system-glibc libmcheck"><primary sortas="c-libmcheck">libmcheck</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libmemusage"> +<term><filename class="libraryfile">libmemusage</filename></term> +<listitem> +<para>Used by <command>memusage</command> to help collect +information about the memory usage of a program</para> +<indexterm zone="ch-system-glibc libmemusage"><primary sortas="c-libmemusage">libmemusage</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libnsl"> +<term><filename class="libraryfile">libnsl</filename></term> +<listitem> +<para>The network services library</para> +<indexterm zone="ch-system-glibc libnsl"><primary sortas="c-libnsl">libnsl</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libnss"> +<term><filename class="libraryfile">libnss</filename></term> +<listitem> +<para>The Name Service Switch libraries, +containing functions for resolving host names, user names, group names, +aliases, services, protocols, etc</para> +<indexterm zone="ch-system-glibc libnss"><primary sortas="c-libnss">libnss</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libpcprofile"> +<term><filename class="libraryfile">libpcprofile</filename></term> +<listitem> +<para>Contains profiling functions used +to track the amount of CPU time spent in specific source code lines</para> +<indexterm zone="ch-system-glibc libpcprofile"><primary sortas="c-libpcprofile">libpcprofile</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libpthread"> +<term><filename class="libraryfile">libpthread</filename></term> +<listitem> +<para>The POSIX threads library</para> +<indexterm zone="ch-system-glibc libpthread"><primary sortas="c-libpthread">libpthread</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libresolv"> +<term><filename class="libraryfile">libresolv</filename></term> +<listitem> +<para>Contains functions for creating, +sending, and interpreting packets to the Internet domain name servers</para> +<indexterm zone="ch-system-glibc libresolv"><primary sortas="c-libresolv">libresolv</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="librpcsvc"> +<term><filename class="libraryfile">librpcsvc</filename></term> +<listitem> +<para>Contains functions providing miscellaneous RPC services</para> +<indexterm zone="ch-system-glibc librpcsvc"><primary sortas="c-librpcsvc">librpcsvc</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="librt"> +<term><filename class="libraryfile">librt</filename></term> +<listitem> +<para>Contains functions providing most of the +interfaces specified by the POSIX.1b Realtime Extension</para> +<indexterm zone="ch-system-glibc librt"><primary sortas="c-librt">librt</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libthread_db"> +<term><filename class="libraryfile">libthread_db</filename></term> +<listitem> +<para>Contains functions useful for +building debuggers for multi-threaded programs</para> +<indexterm zone="ch-system-glibc libthread_db"><primary sortas="c-libthread_db">libthread_db</primary></indexterm> +</listitem> +</varlistentry> + +<varlistentry id="libutil"> +<term><filename class="libraryfile">libutil</filename></term> +<listitem> +<para>Contains code for <quote>standard</quote> functions used in many different Unix utilities</para> +<indexterm zone="ch-system-glibc libutil"><primary sortas="c-libutil">libutil</primary></indexterm> +</listitem> +</varlistentry> +</variablelist> </sect2> </sect1> + |