03-29-2001
A library is a file containing several object files, that can be used as a single entity in a linking phase of a program. Normally the library is indexed, so it is easy to find symbols (functions, variables and so on...) in them. For this reason, linking a program whose object files are ordered in libraries is faster than linking a program whose object files are separate on the disk. Also, when using a library, we have fewer files to look for and open, which even further speeds up linking.
Static libraries are just collections of object files that are linked into the program during the linking phase of compilation, and are not relevant during runtime.
Static libraries are commonly named libname.a. The .a suffix refers to <b>a</b>rchive
dynamic libraries (also called Shared libraries) are lbrararies in which modules can be bound into the executable program at runtime. when the program is started, a program in the system (called a dynamic loader) checks out which shared libraries were linked with the program, loads them to memory, and attaches them to the copy of the program in memory.
Dynamic libraries are commonly named libname.so. The .so suffix refers to <b>s</b>hared <b>o</b>bject.
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ldd_ia(1) General Commands Manual ldd_ia(1)
NAME
ldd_ia: ldd - list dynamic dependencies of executable files or shared libraries on Integrity systems
SYNOPSIS
filename...
Remarks
This manpage describes on Integrity systems. For on PA-RISC systems, see ldd_pa(1).
DESCRIPTION
is a command that can list the dynamic dependencies of incomplete executable files or shared libraries.
lists verbose information about dynamic dependencies and symbol references. If the object file is an executable file, lists all shared
libraries that would be loaded as a result of executing the file. If it is a shared library, lists all shared libraries that would be
loaded as a result of loading the library.
uses the same algorithm as the dynamic loader and to locate the shared libraries at runtime. See in dld.so(5) for more information.
Options
recognizes the following options:
Check reference to data symbols.
Check reference to data and code symbols.
Display the search path used to locate the shared libraries.
Display all dependency relationships.
EXTERNAL INFLUENCES
Environment Variables
uses the following environment variables to locate shared libraries.
These environment variables can be used to specify the directories to be searched for library files at runtime.
The value is a colon-separated list of paths of such directories. For more information, see in dld.so(5) or the option in
ld(1).
The following internationalization variables affect the execution of
Determines the locale category for native language, local customs and
coded character set in the absence of and other environment variables. If is not specified or is set to the empty string, a
default of (see lang(5)) is used instead of
Determines the values for all locale categories and has precedence over
and other environment variables.
Determines the locale that should be used to affect the format
and contents of diagnostic messages written to standard error.
Determines the locale category for numeric formatting.
Determines the locale category for character handling functions.
Determines the location of message catalogs for the processing
of
If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to See envi-
ron(5).
DIAGNOSTICS
prints the record of shared library path names to stdout. The optional list of symbol resolution problems are printed to stderr.
returns zero when the operation is successful. A non-zero return code indicates that an error occurred.
EXAMPLES
By default prints a simple dynamic path information. This consists of the dependencies recorded in the executable (or the shared library)
followed by the physical location where these libraries are found.
The option causes to print dependency relationship along with the dynamic path information.
The option to causes it to analyze all symbol references and print information about unsatisfied code and data symbols.
WARNINGS
does not list shared libraries explicitly loaded using dlopen(3C) or shl_load(3X).
FILES
output file
32-bit Integrity system dynamic loader
64-bit Integrity system dynamic loader
32-bit dummy executable loaded to check the dependencies of shared libraries
64-bit dummy executable loaded to check the dependencies of shared libraries
message catalog
SEE ALSO
System Tools
ld(1) invoke the link editor
Miscellaneous
a.out(4) assembler, compiler, and linker output
dld.so(5) dynamic loader
Texts and Tutorials