.TH ld.so 8 "14 March 1998".SH NAMEld.so/ld-linux.so \- dynamic linker/loader.SH DESCRIPTION.B ld.soloads the shared libraries needed by a program, prepares the programto run, and then runs it.Unless explicitly specified via the.B \-staticoption to.B ldduring compilation, all Linux programs are incomplete and require further linking at run time..PPThe necessary shared libraries needed by the program are searched for in the following order.IP oUsing the environment variable.B LD_LIBRARY_PATH.RB ( LD_AOUT_LIBRARY_PATHfor a.out programs).Except if the executable is a setuid/setgid binary, in which case itis ignored..IP oFrom the cache file.BR /etc/ld.so.cachewhich contains a compiled list of candidate libraries previously foundin the augmented library path..IP oIn the default path.BR /usr/lib ,and then.BR /lib ..SH ENVIRONMENT.TP.B LD_LIBRARY_PATHA colon-separated list of directories in which to search forELF libraries at execution-time.Similar to the .B PATHenvironment variable..TP.B LD_PRELOADA 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 searchdirectories that are also setgid will be loaded..TP.B LD_TRACE_LOADED_OBJECTSIf present, causes the program to list its dynamic library dependencies,as if run by ldd, instead of running normally..TP.B LD_BIND_NOWIf present, causes the dynamic linker to resolve all symbols at programstartup instead of when they are first referenced..TP.B LD_AOUT_LIBRARY_PATHA colon-separated list of directories in which to search fora.out libraries at execution-time.Similar to the .B PATHenvironment variable..TP.B LD_AOUT_PRELOADThe 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_NOWARNSuppress warnings about a.out libraries with incompatible minor version numbers..TP.B LD_KEEPDIRDon'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.soa.out dynamic linker/loader.TP 20.B /lib/ld-linux.so.*ELF dynamic linker/loader.TP.B /etc/ld.so.cacheFile containing a compiled list of directories in which to search forlibraries and an ordered list of candidate libraries..TP.B /etc/ld.so.preloadFile containing a whitespace separated list of ELF shared libraries tobe 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.LPCurrently.B ld.sohas no means of unloading and searching for compatible or newer version oflibraries..PP.B ld.sofunctionality is only available for executables compiled using libc version4.4.3 or greater..SH AUTHORSDavid Engel, Eric Youngdale, Peter MacDonald, Hongjiu Lu, LinusTorvalds, Lars Wirzenius and Mitch D'Souza (not necessarily in that order).