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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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uselib(2) System Calls Manual uselib(2)
uselib - load shared library
#include <unistd.h>
[[deprecated]] int uselib(const char *library);
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.
On success, zero is returned. On error, -1 is returned, and errno
is set to indicate the error.
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.
Linux.
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 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.
ar(1), gcc(1), ld(1), ldd(1), mmap(2), open(2), dlopen(3),
capabilities(7), ld.so(8)
This page is part of the man-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
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⟨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
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part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 uselib(2)
Pages that refer to this page: fanotify_mark(2), syscalls(2)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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