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uselib(2) — Linux manual page

uselib(2)                  System Calls Manualuselib(2)

NAME        top

       uselib - load shared library

SYNOPSIS        top

#include <unistd.h>[[deprecated]] int uselib(const char *library);

DESCRIPTION        top

       The system calluselib() 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        top

       On success, zero is returned.  On error, -1 is returned, anderrno       is set to indicate the error.

ERRORS        top

       In addition to all of the error codes returned byopen(2) andmmap(2), the following may also be returned:EACCESThe library specified bylibrary 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 alsopath_resolution(7).)ENFILEThe system-wide limit on the total number of open files has              been reached.ENOEXEC              The file specified bylibrary is not an executable of a              known type; for example, it does not have the correct magic              numbers.

STANDARDS        top

       Linux.

HISTORY        top

       This obsolete system call is not supported by glibc.  No       declaration is provided in glibc headers, but, through a quirk of       history, glibc before glibc 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 usingsyscall(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 theCONFIG_USELIBoption.

SEE ALSO        top

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

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17uselib(2)

Pages that refer to this page:fanotify_mark(2), syscalls(2)

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