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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/ld.so.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 ld.so 8 "14 March 1998"
+.SH NAME
+ld.so/ld-linux.so \- dynamic linker/loader
+.SH DESCRIPTION
+.B ld.so
+loads the shared libraries needed by a program, prepares the program
+to run, and then runs it.
+Unless explicitly specified via the
+.B \-static
+option to
+.B ld
+during compilation, all Linux programs are incomplete and require
+further linking at run time.
+.PP
+The necessary shared libraries needed by the program are searched for
+in the following order
+.IP o
+Using the environment variable
+.B LD_LIBRARY_PATH
+.RB ( LD_AOUT_LIBRARY_PATH
+for a.out programs).
+Except if the executable is a setuid/setgid binary, in which case it
+is ignored.
+.IP o
+From the cache file
+.BR /etc/ld.so.cache
+which contains a compiled list of candidate libraries previously found
+in the augmented library path.
+.IP o
+In the default path
+.BR /usr/lib ,
+and then
+.BR /lib .
+.SH ENVIRONMENT
+.TP
+.B LD_LIBRARY_PATH
+A colon-separated list of directories in which to search for
+ELF libraries at execution-time.
+Similar to the
+.B PATH
+environment variable.
+.TP
+.B 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.
+.TP
+.B LD_TRACE_LOADED_OBJECTS
+If present, causes the program to list its dynamic library dependencies,
+as if run by ldd, instead of running normally.
+.TP
+.B LD_BIND_NOW
+If present, causes the dynamic linker to resolve all symbols at program
+startup instead of when they are first referenced.
+.TP
+.B LD_AOUT_LIBRARY_PATH
+A colon-separated list of directories in which to search for
+a.out libraries at execution-time.
+Similar to the
+.B PATH
+environment variable.
+.TP
+.B 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.
+.TP
+.B LD_NOWARN
+Suppress warnings about a.out libraries with incompatible minor
+version numbers.
+.TP
+.B LD_KEEPDIR
+Don't ignore the directory in the names of a.out libraries to be loaded.
+Use of this option is strongly discouraged.
+.SH FILES
+.PD 0
+.TP 20
+.B /lib/ld.so
+a.out dynamic linker/loader
+.TP 20
+.B /lib/ld-linux.so.*
+ELF dynamic linker/loader
+.TP
+.B /etc/ld.so.cache
+File containing a compiled list of directories in which to search for
+libraries and an ordered list of candidate libraries.
+.TP
+.B /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.
+.TP
+.B lib*.so*
+shared libraries
+.PD
+.SH SEE ALSO
+.BR ldd (1),
+.BR ldconfig (8).
+.SH BUGS
+.LP
+Currently
+.B ld.so
+has no means of unloading and searching for compatible or newer version of
+libraries.
+.PP
+.B ld.so
+functionality is only available for executables compiled using libc version
+4.4.3 or greater.
+.SH AUTHORS
+David Engel, Eric Youngdale, Peter MacDonald, Hongjiu Lu, Linus
+Torvalds, Lars Wirzenius and Mitch D'Souza (not necessarily in that order).