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/* 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);
}
return _dlerror_run (doit) ? NULL : (void *) (loadbase + ref->st_value);
}
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