a8571d373c
2000-05-09 Jakub Jelinek <jakub@redhat.com> * elf/dl-sym.c (_dl_sym): Test ref not result for non-zero. (_dl_vsym): Likewise. Reported by Owen Taylor <otaylor@redhat.com>. * elf/dl-deps.c (_dl_map_object_deps): Zero terminate L->l_initfini always.
137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/* Look up a symbol in a shared object loaded by `dlopen'.
|
|
Copyright (C) 1999, 2000 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., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <stddef.h>
|
|
#include <setjmp.h>
|
|
#include <libintl.h>
|
|
|
|
#include <dlfcn.h>
|
|
#include <ldsodefs.h>
|
|
#include <dl-hash.h>
|
|
|
|
void *
|
|
internal_function
|
|
_dl_sym (void *handle, const char *name, void *who)
|
|
{
|
|
const ElfW(Sym) *ref = NULL;
|
|
lookup_t result;
|
|
|
|
if (handle == RTLD_DEFAULT)
|
|
/* Search the global scope. */
|
|
result = _dl_lookup_symbol (name, NULL, &ref, _dl_global_scope, 0);
|
|
else
|
|
{
|
|
struct link_map *l, *match;
|
|
ElfW(Addr) caller = (ElfW(Addr)) who;
|
|
|
|
/* Find the highest-addressed object that CALLER is not below. */
|
|
match = NULL;
|
|
for (l = _dl_loaded; l; l = l->l_next)
|
|
if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
|
|
match = l;
|
|
|
|
if (handle != RTLD_NEXT)
|
|
{
|
|
/* Search the scope of the given object. */
|
|
struct link_map *map = handle;
|
|
|
|
if (match == NULL)
|
|
/* If the address is not recognized the call comes from the
|
|
main program (we hope). */
|
|
match = _dl_loaded;
|
|
|
|
result = _dl_lookup_symbol (name, match, &ref, map->l_local_scope,
|
|
0);
|
|
}
|
|
else
|
|
{
|
|
if (! match)
|
|
_dl_signal_error (0, NULL, _("\
|
|
RTLD_NEXT used in code not dynamically loaded"));
|
|
|
|
l = match;
|
|
while (l->l_loader)
|
|
l = l->l_loader;
|
|
|
|
result = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope,
|
|
match);
|
|
}
|
|
}
|
|
|
|
if (ref)
|
|
return DL_SYMBOL_ADDRESS (result, ref);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void *
|
|
internal_function
|
|
_dl_vsym (void *handle, const char *name, const char *version, void *who)
|
|
{
|
|
const ElfW(Sym) *ref = NULL;
|
|
struct r_found_version vers;
|
|
lookup_t result;
|
|
|
|
/* Compute hash value to the version string. */
|
|
vers.name = version;
|
|
vers.hidden = 1;
|
|
vers.hash = _dl_elf_hash (version);
|
|
/* We don't have a specific file where the symbol can be found. */
|
|
vers.filename = NULL;
|
|
|
|
if (handle == RTLD_DEFAULT)
|
|
/* Search the global scope. */
|
|
result = _dl_lookup_versioned_symbol (name, NULL, &ref, _dl_global_scope,
|
|
&vers, 0);
|
|
else if (handle == RTLD_NEXT)
|
|
{
|
|
struct link_map *l, *match;
|
|
ElfW(Addr) caller = (ElfW(Addr)) who;
|
|
|
|
/* Find the highest-addressed object that CALLER is not below. */
|
|
match = NULL;
|
|
for (l = _dl_loaded; l; l = l->l_next)
|
|
if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
|
|
match = l;
|
|
|
|
if (! match)
|
|
_dl_signal_error (0, NULL, _("\
|
|
RTLD_NEXT used in code not dynamically loaded"));
|
|
|
|
l = match;
|
|
while (l->l_loader)
|
|
l = l->l_loader;
|
|
|
|
result = _dl_lookup_versioned_symbol_skip (name, l, &ref,
|
|
l->l_local_scope,
|
|
&vers, match);
|
|
}
|
|
else
|
|
{
|
|
/* Search the scope of the given object. */
|
|
struct link_map *map = handle;
|
|
result = _dl_lookup_versioned_symbol (name, map, &ref,
|
|
map->l_local_scope, &vers, 0);
|
|
}
|
|
|
|
if (ref)
|
|
return DL_SYMBOL_ADDRESS (result, ref);
|
|
return NULL;
|
|
}
|