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NAME

       uselib - load shared library

SYNOPSIS

       #include <unistd.h>

       int uselib(const char *library);

DESCRIPTION

       The  system call uselib() serves to load a shared library to be used by
       the calling process.  It is given a pathname.   The  address  where  to
       load  is  found  in  the  library  itself.   The  library  can have any
       recognized binary format.

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and  errno  is
       set appropriately.

ERRORS

       In  addition to all of the error codes returned by open(2) and mmap(2),
       the following may also be returned:

       EACCES The library specified by library does not have read  or  execute
              permission,  or  the  caller does not have search permission for
              one  of  the  directories  in  the  path  prefix.    (See   also
              path_resolution(7).)

       ENFILE The  system  limit  on  the  total number of open files has been
              reached.

       ENOEXEC
              The file specified by library is  not  an  executable  of  known
              type, e.g., does not have the correct magic numbers.

CONFORMING TO

       uselib() is Linux-specific, and should not be used in programs intended
       to be portable.

NOTES

       uselib() was used by  early  libc  startup  code  to  load  the  shared
       libraries with names found in an array of names in the binary.

       Since  libc  4.3.2,  startup  code  tries  to  prefix  these names with
       "/usr/lib", "/lib" and "" before giving up.  In libc  4.3.4  and  later
       these names are looked for in the directories found in LD_LIBRARY_PATH,
       and if not found there, prefixes "/usr/lib", "/lib" and "/" are  tried.

       From  libc  4.4.4  on  only the library "/lib/ld.so" is loaded, so that
       this dynamic library can load the  remaining  libraries  needed  (again
       using this call).  This is also the state of affairs in libc5.

       glibc2 does not use this call.

SEE ALSO

       ar(1),    gcc(1),   ld(1),   ldd(1),   mmap(2),   open(2),   dlopen(3),
       capabilities(7), ld.so(8)

COLOPHON

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