1 /* Look up a symbol in a shared object loaded by `dlopen'.
2 Copyright (C) 1999 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
30 _dl_sym (void *handle, const char *name, void *who)
33 const ElfW(Sym) *ref = NULL;
35 if (handle == RTLD_DEFAULT)
36 /* Search the global scope. */
37 loadbase = _dl_lookup_symbol (name, NULL, &ref, _dl_global_scope, 0);
40 struct link_map *l, *match;
41 ElfW(Addr) caller = (ElfW(Addr)) who;
43 /* Find the highest-addressed object that CALLER is not below. */
45 for (l = _dl_loaded; l; l = l->l_next)
46 if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
49 if (handle != RTLD_NEXT)
51 /* Search the scope of the given object. */
52 struct link_map *map = handle;
55 /* If the address is not recognized the call comes from the
56 main program (we hope). */
59 loadbase = _dl_lookup_symbol (name, match, &ref, map->l_local_scope,
65 _dl_signal_error (0, NULL, _("\
66 RTLD_NEXT used in code not dynamically loaded"));
72 loadbase = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope,
78 return (void *) (loadbase + ref->st_value);
85 _dl_vsym (void *handle, const char *name, const char *version, void *who)
88 const ElfW(Sym) *ref = NULL;
89 struct r_found_version vers;
91 /* Compute hash value to the version string. */
94 vers.hash = _dl_elf_hash (version);
95 /* We don't have a specific file where the symbol can be found. */
98 if (handle == RTLD_DEFAULT)
99 /* Search the global scope. */
100 loadbase = _dl_lookup_versioned_symbol (name, NULL, &ref, _dl_global_scope,
102 else if (handle == RTLD_NEXT)
104 struct link_map *l, *match;
105 ElfW(Addr) caller = (ElfW(Addr)) who;
107 /* Find the highest-addressed object that CALLER is not below. */
109 for (l = _dl_loaded; l; l = l->l_next)
110 if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
114 _dl_signal_error (0, NULL, _("\
115 RTLD_NEXT used in code not dynamically loaded"));
121 loadbase = _dl_lookup_versioned_symbol_skip (name, l, &ref,
127 /* Search the scope of the given object. */
128 struct link_map *map = handle;
129 loadbase = _dl_lookup_versioned_symbol (name, map, &ref,
130 map->l_local_scope, &vers, 0);
134 return (void *) (loadbase + ref->st_value);