source: appendixa/glibc-desc.xml@ 2ea93a3

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Last change on this file since 2ea93a3 was 087e584, checked in by Alex Gronenwoud <alex@…>, 21 years ago

Small retouches of the text. Wrapping 'last checked' in parentheses.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2706 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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1<sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>
2
3<sect2><title>Descriptions</title>
4
5<para>(Last checked against version &glibc-contversion;.)</para>
6
7<sect3><title>Program file descriptions</title>
8
9<sect4><title>catchsegv</title>
10<para>catchsegv can be used to create a stack trace when a program
11terminates with a segmentation fault.</para></sect4>
12
13<sect4><title>gencat</title>
14<para>gencat generates message catalogues.</para></sect4>
15
16<sect4><title>getconf</title>
17<para>getconf displays the system configuration values for filesystem
18specific variables.</para></sect4>
19
20<sect4><title>getent</title>
21<para>getent gets entries from an administrative database.</para></sect4>
22
23<sect4><title>glibcbug</title>
24<para>glibcbug creates a bug report about glibc and and mails it to the
25bug email address.</para></sect4>
26
27<sect4><title>iconv</title>
28<para>iconv performs character set conversion.</para></sect4>
29
30<sect4><title>iconvconfig</title>
31<para>iconvconfig creates fastloading iconv module
32configuration file.</para></sect4>
33
34<sect4><title>ldconfig</title>
35<para>ldconfig configures the dynamic linker run time bindings.</para></sect4>
36
37<sect4><title>ldd</title>
38<para>ldd prints the shared libraries required by each program or shared
39library specified on the command line.</para></sect4>
40
41<sect4><title>lddlibc4</title>
42<para>lddlibc4 assists ldd with object files.</para></sect4>
43
44<sect4><title>locale</title>
45<para>locale is a Perl program which tells the compiler to enable
46(or disable) the use of POSIX locales for built-in operations.</para></sect4>
47
48<sect4><title>localedef</title>
49<para>localedef compiles locale specifications.</para></sect4>
50
51<sect4><title>mtrace</title>
52<para>(No description available yet.)</para></sect4>
53
54<sect4><title>nscd</title>
55<para>nscd is a daemon that provides a cache for the most common name
56service requests.</para></sect4>
57
58<sect4><title>nscd_nischeck</title>
59<para>nscd_nischeck checks whether or not secure mode is necessary for
60NIS+ lookup.</para></sect4>
61
62<sect4><title>pcprofiledump</title>
63<para>pcprofiledump dumps information generated by
64PC profiling.</para></sect4>
65
66<sect4><title>pt_chown</title>
67<para>pt_chown sets the owner, group and access permission of the
68slave pseudo terminal corresponding to the master pseudo terminal passed
69on file descriptor `3'. This is the helper program for the `grantpt'
70function. It is not intended to be run directly from the command
71line.</para></sect4>
72
73<sect4><title>rpcgen</title>
74<para>rpcgen generates C code to implement the RPC protocol.</para></sect4>
75
76<sect4><title>rpcinfo</title>
77<para>rpcinfo makes an RPC call to an RPC server.</para></sect4>
78
79<sect4><title>sln</title>
80<para>sln symbolically links dest to source. It is statically linked,
81needing no dynamic linking at all. Thus sln is useful to make symbolic
82links to dynamic libraries if the dynamic linking system for some reason
83is nonfunctional.</para></sect4>
84
85<sect4><title>sprof</title>
86<para>sprof reads and displays shared object profiling data.</para></sect4>
87
88<sect4><title>tzselect</title>
89<para>tzselect asks the user for information about the current location and
90outputs the resulting time zone description to standard output.</para></sect4>
91
92<sect4><title>xtrace</title>
93<para>xtrace traces execution of program by printing the currently executed
94function.</para></sect4>
95
96<sect4><title>zdump</title>
97<para>zdump is the time zone dumper.</para></sect4>
98
99<sect4><title>zic</title>
100<para>zic is the time zone compiler.</para></sect4>
101
102</sect3>
103
104<sect3><title>Library file descriptions</title>
105
106<sect4><title>ld.so</title>
107<para>ld.so is the helper program for shared library
108executables.</para></sect4>
109
110<sect4><title>libBrokenLocale</title>
111<para>Used by software, such as Mozilla, to solve broken locales.</para></sect4>
112
113<sect4><title>libSegFault</title>
114<para>libSegFault is a segmentation fault signal handler. It tries to catch
115segfaults.</para></sect4>
116
117<sect4><title>libanl</title>
118<para>libanl is an asynchronous name lookup library.</para></sect4>
119
120<sect4><title>libbsd-compat</title>
121<para>libbsd-compat provides the portability needed in order to run certain
122programs in Linux.</para></sect4>
123
124<sect4><title>libc, libc_nonshared</title>
125<para>These files constitute the main C library. The C library is a
126collection of commonly used functions in programs.
127This way a programmer doesn't need to create his own functions for every
128single task. The most common things like writing a string to the screen
129are already present and at the disposal of the programmer.</para>
130
131<para>The C library (actually almost every library) comes in two flavors:
132a dynamic and a static one. In short, when a program uses a static C
133library, the code from the C library is copied into the executable file.
134When a program uses a dynamic library, the executable will not
135contain the code from the C library, but instead a routine that loads
136the functions from the library at the time the program is run. This
137means a significant decrease in the file size of a program. The
138documentation that comes with the C library describes this in more
139detail, as it is too complicated to explain here in one or two
140lines.</para></sect4>
141
142<sect4><title>libcrypt</title>
143<para>libcrypt is the cryptography library.</para></sect4>
144
145<sect4><title>libdl</title>
146<para>libdl is the dynamic linking interface library.</para></sect4>
147
148<sect4><title>libg</title>
149<para>libg is a runtime library for g++.</para></sect4>
150
151<sect4><title>libieee</title>
152<para>libieee is the IEEE floating point library.</para></sect4>
153
154<sect4><title>libm</title>
155<para>libm is the mathematical library.</para></sect4>
156
157<sect4><title>libmcheck</title>
158<para>libmcheck contains code run at boot.</para></sect4>
159
160<sect4><title>libmemusage</title>
161<para>libmemusage is used by memusage to help collect information about the
162memory usage of a program.</para></sect4>
163
164<sect4><title>libnsl</title>
165<para>libnsl is the network services library.</para></sect4>
166
167<sect4><title>libnss_compat, libnss_dns, libnss_files,
168libnss_hesiod, libnss_nis, libnss_nisplus</title>
169<para>The basic idea is to put the implementation of the different services
170offered to access the databases in separate modules. This has some
171advantages:</para>
172<itemizedlist>
173<listitem><para>contributors can add new services without adding them to
174GNU C library,</para></listitem>
175<listitem><para>the modules can be updated separately,</para></listitem>
176<listitem><para>the C library image is smaller.</para></listitem>
177</itemizedlist></sect4>
178
179<sect4><title>libpcprofile</title>
180<para>Code used by the kernel to track CPU time spent in functions, source
181code lines, and instructions.</para></sect4>
182
183<sect4><title>libpthread</title>
184<para>The POSIX threads library.</para></sect4>
185
186<sect4><title>libresolv</title>
187<para>Functions in this library provide for creating, sending, and
188interpreting packets to the Internet domain name servers.</para></sect4>
189
190<sect4><title>librpcsvc</title>
191<para>Functions in this library provide miscellaneous RPC services.</para></sect4>
192
193<sect4><title>librt</title>
194<para>Functions in this library provide most of the interfaces specified by
195the POSIX.1b Realtime Extension.</para></sect4>
196
197<sect4><title>libthread_db</title>
198<para>Functions is this library are useful for building debuggers for
199multi-threaded programs.</para></sect4>
200
201<sect4><title>libutil</title>
202<para>Contains code for "standard" functions used in many different Unix
203utilities.</para></sect4>
204
205</sect3>
206
207</sect2>
208
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