138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/* Look up a symbol in a shared object loaded by `dlopen'.
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stddef.h>
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#include <setjmp.h>
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#include <libintl.h>
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#include <dlfcn.h>
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#include <ldsodefs.h>
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#include <dl-hash.h>
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void *
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internal_function
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_dl_sym (void *handle, const char *name, void *who)
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{
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const ElfW(Sym) *ref = NULL;
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lookup_t result;
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ElfW(Addr) caller = (ElfW(Addr)) who;
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struct link_map *match;
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struct link_map *l;
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/* Find the highest-addressed object that CALLER is not below. */
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match = NULL;
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for (l = _dl_loaded; l; l = l->l_next)
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if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
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match = l;
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if (handle == RTLD_DEFAULT)
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/* Search the global scope. */
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result = _dl_lookup_symbol (name, match, &ref, _dl_global_scope, 0, 0);
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else
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{
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if (handle != RTLD_NEXT)
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{
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/* Search the scope of the given object. */
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struct link_map *map = handle;
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if (match == NULL)
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/* If the address is not recognized the call comes from the
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main program (we hope). */
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match = _dl_loaded;
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result = _dl_lookup_symbol (name, match, &ref, map->l_local_scope,
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0, 1);
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}
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else
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{
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if (! match)
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_dl_signal_error (0, NULL, N_("\
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RTLD_NEXT used in code not dynamically loaded"));
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l = match;
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while (l->l_loader)
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l = l->l_loader;
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result = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope,
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match);
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}
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}
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if (ref)
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return DL_SYMBOL_ADDRESS (result, ref);
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return NULL;
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}
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void *
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internal_function
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_dl_vsym (void *handle, const char *name, const char *version, void *who)
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{
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const ElfW(Sym) *ref = NULL;
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struct r_found_version vers;
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lookup_t result;
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ElfW(Addr) caller = (ElfW(Addr)) who;
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struct link_map *match;
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struct link_map *l;
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/* Compute hash value to the version string. */
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vers.name = version;
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vers.hidden = 1;
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vers.hash = _dl_elf_hash (version);
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/* We don't have a specific file where the symbol can be found. */
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vers.filename = NULL;
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/* Find the highest-addressed object that CALLER is not below. */
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match = NULL;
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for (l = _dl_loaded; l; l = l->l_next)
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if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
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match = l;
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if (handle == RTLD_DEFAULT)
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/* Search the global scope. */
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result = _dl_lookup_versioned_symbol (name, match, &ref, _dl_global_scope,
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&vers, 0, 0);
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else if (handle == RTLD_NEXT)
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{
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if (! match)
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_dl_signal_error (0, NULL, N_("\
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RTLD_NEXT used in code not dynamically loaded"));
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l = match;
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while (l->l_loader)
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l = l->l_loader;
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result = _dl_lookup_versioned_symbol_skip (name, l, &ref,
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l->l_local_scope,
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&vers, match);
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}
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else
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{
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/* Search the scope of the given object. */
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struct link_map *map = handle;
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result = _dl_lookup_versioned_symbol (name, map, &ref,
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map->l_local_scope, &vers, 0, 1);
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}
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if (ref)
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return DL_SYMBOL_ADDRESS (result, ref);
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return NULL;
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}
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