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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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USELIB(2) Linux Programmer's Manual USELIB(2)
uselib - load shared library
#include <unistd.h>
int uselib(const char *library);
Note: No declaration of this system call is provided in glibc
headers; see NOTES.
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.
uselib() is Linux-specific, and should not be used in programs
intended to be portable.
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.
ar(1), gcc(1), ld(1), ldd(1), mmap(2), open(2), dlopen(3),
capabilities(7), ld.so(8)
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/.
Linux 2021-03-22 USELIB(2)
Pages that refer to this page: fanotify_mark(2), syscalls(2)
Copyright and license for this manual page
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