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ld.so
!!!ld.so
NAME
DESCRIPTION
ENVIRONMENT
FILES
SEE ALSO
BUGS
AUTHORS
----
!!NAME


ld.so/ld-linux.so - dynamic linker/loader
!!DESCRIPTION


__ld.so__ loads the shared libraries needed by a program,
prepares the program to run, and then runs it. Unless
explicitly specified via the __-static__ option to
__ld__ during compilation, all Linux programs are
incomplete and require further linking at run
time.


The necessary shared libraries needed by the program are
searched for in the following order


o


Using the environment variable __LD_LIBRARY_PATH__
(__LD_AOUT_LIBRARY_PATH__ for a.out programs). Except if
the executable is a setuid/setgid binary, in which case it
is ignored.


o


From the cache file __/etc/ld.so.cache__ which contains a
compiled list of candidate libraries previously found in the
augmented library path.


o


In the default path __/usr/lib__, and then
__/lib__.
!!ENVIRONMENT


__LD_LIBRARY_PATH__


A colon-separated list of directories in which to search for
ELF libraries at execution-time. Similar to the __PATH__
environment variable.


__LD_PRELOAD__


A whitespace-separated list of additional, user-specified,
ELF shared libraries to be loaded before all others. This
can be used to selectively override functions in other
shared libraries. For setuid/setgid ELF binaries, only
libraries in the standard search directories that are also
setgid will be loaded.


__LD_TRACE_LOADED_OBJECTS__


If present, causes the program to list its dynamic library
dependencies, as if run by ldd, instead of running
normally.


__LD_BIND_NOW__


If present, causes the dynamic linker to resolve all symbols
at program startup instead of when they are first
referenced.


__LD_AOUT_LIBRARY_PATH__


A colon-separated list of directories in which to search for
a.out libraries at execution-time. Similar to the
__PATH__ environment variable.


__LD_AOUT_PRELOAD__


The name of an additional, user-specified, a.out shared
library to be loaded after all others. This can be used to
selectively override functions in other shared
libraries.


__LD_NOWARN__


Suppress warnings about a.out libraries with incompatible
minor version numbers.


__LD_KEEPDIR__


Don't ignore the directory in the names of a.out libraries
to be loaded. Use of this option is strongly
discouraged.
!!FILES


__/lib/ld.so__ a.out dynamic linker/loader


__/lib/ld-linux.so.*__


ELF dynamic linker/loader


__/etc/ld.so.cache__


File containing a compiled list of directories in which to
search for libraries and an ordered list of candidate
libraries.


__/etc/ld.so.preload__


File containing a whitespace separated list of ELF shared
libraries to be loaded before the program. libraries and an
ordered list of candidate libraries.


__lib*.so*__ shared libraries
!!SEE ALSO


ldd(1), ldconfig(8).
!!BUGS


Currently __ld.so__ has no means of unloading and
searching for compatible or newer version of
libraries.


__ld.so__ functionality is only available for executables
compiled using libc version 4.4.3 or greater.
!!AUTHORS


David Engel, Eric Youngdale, Peter !MacDonald, Hongjiu Lu,
Linus Torvalds, Lars Wirzenius and Mitch D'Souza (not
necessarily in that order).
----
12 pages link to ld.so(8):
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Last edited on Tuesday, June 4, 2002 12:31:14 am by "perry"
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