52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/* dlsym -- Look up a symbol in a shared object loaded by `dlopen'.
|
|
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <stddef.h>
|
|
#include <link.h>
|
|
#include <dlfcn.h>
|
|
#include <setjmp.h>
|
|
|
|
|
|
void *
|
|
dlsym (void *handle, const char *name)
|
|
{
|
|
ElfW(Addr) loadbase;
|
|
const ElfW(Sym) *ref = NULL;
|
|
void doit (void)
|
|
{
|
|
struct link_map *map = handle, **scope, *mapscope[2] = { map, NULL };
|
|
const char *owner;
|
|
|
|
if (map)
|
|
{
|
|
/* Search the scope of the given object. */
|
|
scope = mapscope;
|
|
owner = map->l_name;
|
|
}
|
|
else
|
|
{
|
|
scope = &(_dl_global_scope ?: _dl_default_scope)[2];
|
|
owner = NULL;
|
|
}
|
|
loadbase = _dl_lookup_symbol (name, &ref, scope, owner, 0, 0);
|
|
}
|
|
|
|
return _dlerror_run (doit) ? NULL : (void *) (loadbase + ref->st_value);
|
|
}
|