NAME

       uselib - load shared library

SYNOPSIS

       #include <unistd.h>

       int uselib(const char *library);

       Note: No declaration of this system call is provided in glibc headers; see NOTES.

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 to indicate the
       error.

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-wide limit on the total number of open files has been reached.

       ENOEXEC
              The file specified by library is not an executable of a known type; for example, it
              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

       This obsolete system call is not supported by glibc.  No declaration is provided in  glibc
       headers, but, through a quirk of history, glibc versions before 2.23 did export an ABI for
       this system call.  Therefore, in order to employ this system call, it  was  sufficient  to
       manually  declare  the  interface in your code; alternatively, you could invoke the system
       call using syscall(2).

       In ancient libc versions (before  glibc  2.0),  uselib()  was  used  to  load  the  shared
       libraries with names found in an array of names in the binary.

       Since  Linux  3.15,  this system call is available only when the kernel is configured with
       the CONFIG_USELIB option.

SEE ALSO

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

COLOPHON

       This page is part of release 5.13 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at https://www.kernel.org/doc/man-pages/.