USELIB(2) manual page
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uselib - load shared library
#include
<unistd.h>
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 appropriately.
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.
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.
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 3.78 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/.
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