NAME¶
uselib - load shared library
SYNOPSIS¶
#include <unistd.h>
int uselib(const char *library);
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 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.
NOTES¶
uselib() was used by early libc startup code to load the shared libraries
with names found in an array of names in the binary.
Since libc 4.3.2, startup code tries to prefix these names with
"/usr/lib", "/lib" and "" before giving up. In
libc 4.3.4 and later these names are looked for in the directories found in
LD_LIBRARY_PATH, and if not found there, prefixes "/usr/lib",
"/lib" and "/" are tried.
From libc 4.4.4 on only the library "/lib/ld.so" is loaded, so that
this dynamic library can load the remaining libraries needed (again using this
call). This is also the state of affairs in libc5.
glibc2 does not use this call.
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 3.74 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
http://www.kernel.org/doc/man-pages/.
