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 known type, e.g., 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
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), capability(7), ld.so(8)
Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
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Modified by Michael Haardt <michael@moria.de>
Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
Modified 1996-10-22 by Eric S. Raymond <esr@thyrsus.com>
Modified 2004-06-23 by Michael Kerrisk <mtk16@ext.canterbury.ac.nz>
Modified 2005-01-09 by aeb
|
