uselib

USELIB(2)                   Linux Programmer's Manual                  USELIB(2)



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
       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-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 5.10 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/.



Linux                              2020-12-21                          USELIB(2)