/sbin/ldconfig — configure dynamic linker run time bindings
/sbin/ldconfig
[−nNvXV
] [ −f
conf ] [ −C
cache ] [ −r
root ] directory...
/sbin/ldconfig
−l
[−v
] library...
/sbin/ldconfig
−p
ldconfig
creates the necessary links and cache to the most recent
shared libraries found in the directories specified on the
command line, in the file /etc/ld.so.conf
, and in the trusted
directories (/lib
and
/usr/lib
). The cache is used by
the run-time linker, ld.so or ld-linux.so. ldconfig checks the header and
filenames of the libraries it encounters when determining
which versions should have their links updated.
ldconfig will attempt to deduce the type of ELF libs (ie. libc5 or libc6/glibc) based on what C libs, if any, the library was linked against.
Some existing libs do not contain enough information to
allow the deduction of their type. Therefore, the
/etc/ld.so.conf
file format
allows the specification of an expected type. This is
only
used for those
ELF libs which we can not work out. The format is
"dirname=TYPE", where TYPE can be libc4, libc5, or libc6.
(This syntax also works on the command line.) Spaces are
not
allowed. Also
see the −p
option.
ldconfig should
normally be run by the superuser as it may require write
permission on some root owned directories and files.
−v
Verbose mode. Print current version number, the name of each directory as it is scanned, and any links that are created. Overrides quiet mode.
−n
Only process directories specified on the command
line. Don't process the trusted directories
(/lib
and /usr/lib
) nor those specified in
/etc/ld.so.conf
. Implies
−N
.
−N
Don't rebuild the cache. Unless −X
is also specified, links are
still updated.
−X
Don't update links. Unless −N
is also specified, the cache
is still rebuilt.
−fconf
Use conf
instead of /etc/ld.so.conf
.
−Ccache
Use cache
instead of /etc/ld.so.cache
.
−rroot
Change to and use root
as the root
directory.
−l
Library mode. Manually link individual libraries. Intended for use by experts only.
−p
Print the lists of directories and candidate libraries stored in the current cache.
/lib/ld.so
run-time linker/loader
/etc/ld.so.conf
File containing a list of colon, space, tab, newline, or comma-separated directories in which to search for libraries.
/etc/ld.so.cache
File containing an ordered list of libraries found
in the directories specified in /etc/ld.so.conf
.
ldd(1), ld.so(8)
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