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authorEric Andersen <andersen@codepoet.org>2001-04-23 17:43:54 +0000
committerEric Andersen <andersen@codepoet.org>2001-04-23 17:43:54 +0000
commit66f269d2a51dae6a2cb10f1a9ae4aaeba815219b (patch)
treee2094832990caf6d849ba90e4b1a82a6264f86b3 /ldso/man/ldconfig.8
parentc4a3f3f81ea90e3df93c352ac0e2161a4bfd3327 (diff)
Initial checkin for ld.so. This is a combination of effort from Manuel Novoa
III and me. I've been working on stripping out arch dependant stuff and replacing it with generic stuff whenever possible. -Erik
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+.TH ldconfig 8 "14 March 1998"
+.SH NAME
+ldconfig \- determine run-time link bindings
+.SH SYNOPSIS
+ldconfig
+.RB [ \-DvqnNX ]
+.RB [ \-f\ conf ]
+.RB [ \-C\ cache ]
+.RB [ \-r\ root ]
+.IR directory \ ...
+.PD 0
+.PP
+.PD
+ldconfig
+.B \-l
+.RB [ \-Dvq ]
+.IR library \ ...
+.PD 0
+.PP
+.PD
+ldconfig
+.B \-p
+.SH DESCRIPTION
+.B ldconfig
+creates the necessary links and cache (for use by the run-time linker,
+.IR ld.so )
+to the most recent shared libraries found in the directories specified
+on the command line, in the file
+.IR /etc/ld.so.conf ,
+and in the trusted directories
+.RI ( /usr/lib
+and
+.IR /lib ).
+.B ldconfig
+checks the header and file names of the libraries it encounters when
+determining which versions should have their links updated.
+.B ldconfig
+ignores symbolic links when scanning for libraries.
+.PP
+.B 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, therefore when
+making dynamic libraries, it is wise to explicitly link against libc (use -lc).
+.PP
+Some existing libs do not contain enough information to allow the deduction of
+their type, therefore the
+.IR /etc/ld.so.conf
+file format allows the specification of an expected type. This is
+.B only
+used for those ELF libs which we can not work out. The format
+is like this "dirname=TYPE", where type can be libc4, libc5 or libc6.
+(This syntax also works on the command line). Spaces are
+.B not
+allowed. Also see the
+.B -p
+option.
+.PP
+Directory names containing an
+.B = are no longer legal
+unless they also have an expected type specifier.
+.PP
+.B ldconfig
+should normally be run by the super-user as it may require write
+permission on some root owned directories and files.
+It is normally run automatically at bootup, from /etc/rc, or manually
+whenever new DLL's are installed.
+.SH OPTIONS
+.TP
+.B \-D
+Debug mode.
+Implies
+.B \-N
+and
+.BR \-X .
+.TP
+.B \-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.
+.TP
+.B \-q
+Quiet mode.
+Don't print warnings.
+.TP
+.B \-n
+Only process directories specified on the command line.
+Don't process the trusted directories
+.RI ( /usr/lib
+and
+.IR /lib )
+nor those specified in
+.IR /etc/ld.so.conf .
+Implies
+.BR \-N .
+.TP
+.B \-N
+Don't rebuild the cache.
+Unless
+.B \-X
+is also specified, links are still updated.
+.TP
+.B \-X
+Don't update links.
+Unless
+.B \-N
+is also specified, the cache is still rebuilt.
+.TP
+.B \-f conf
+Use
+.B conf
+instead of
+.IR /etc/ld.so.conf .
+.TP
+.B \-C cache
+Use
+.B cache
+instead of
+.IR /etc/ld.so.cache .
+.TP
+.B \-r root
+Change to and use
+.B root
+as the root directory.
+.TP
+.B \-l
+Library mode.
+Manually link individual libraries.
+Intended for use by experts only.
+.TP
+.B \-p
+Print the lists of directories and candidate libraries stored in
+the current cache.
+.SH EXAMPLES
+In the bootup file
+.I /etc/rc
+having the line
+.RS
+
+/sbin/ldconfig -v
+
+.RE
+will set up the correct links for the shared binaries and rebuild
+the cache.
+.TP
+On the command line
+.RS
+
+# /sbin/ldconfig -n /lib
+
+.RE
+as root after the installation of a new DLL, will properly update the
+shared library symbolic links in /lib.
+
+.SH FILES
+.PD 0
+.TP 20
+.B /lib/ld.so
+execution time linker/loader
+.TP 20
+.B /etc/ld.so.conf
+File containing a list of colon, space, tab, newline, or comma spearated
+directories in which to search for libraries.
+.TP 20
+.B /etc/ld.so.cache
+File containing an ordered list of libraries found in the directories
+specified in
+.BR /etc/ld.so.conf .
+.TP
+.B lib*.so.version
+shared libraries
+.PD
+.SH SEE ALSO
+.BR ldd (1),
+.BR ld.so (8).
+.SH BUGS
+.LP
+.BR ldconfig 's
+functionality, in conjunction with
+.BR ld.so ,
+is only available for executables compiled using libc version 4.4.3 or greater.
+.PP
+.BR ldconfig ,
+being a user process, must be run manually and has no means of dynamically
+determining and relinking shared libraries for use by
+.BR ld.so
+when a new DLL is installed.
+.SH AUTHORS
+David Engel and Mitch D'Souza.