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Commit | Line | Data |
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c84142e8 UD |
1 | /* Look up a symbol in a shared object loaded by `dlopen'. |
2 | Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. | |
afd4eb37 UD |
3 | This file is part of the GNU C Library. |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
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. */ | |
d66e34cd RM |
19 | |
20 | #include <stddef.h> | |
21 | #include <link.h> | |
22 | #include <dlfcn.h> | |
23 | #include <setjmp.h> | |
24 | ||
25 | ||
26 | void * | |
27 | dlsym (void *handle, const char *name) | |
28 | { | |
84384f5b | 29 | ElfW(Addr) caller = (ElfW(Addr)) __builtin_return_address (0); |
266180eb RM |
30 | ElfW(Addr) loadbase; |
31 | const ElfW(Sym) *ref = NULL; | |
d66e34cd RM |
32 | void doit (void) |
33 | { | |
84384f5b UD |
34 | if (handle == NULL) |
35 | /* Search the global scope. */ | |
36 | loadbase = _dl_lookup_symbol | |
37 | (name, &ref, &(_dl_global_scope ?: _dl_default_scope)[2], NULL, 0); | |
38 | else if (handle == RTLD_NEXT) | |
622586fb | 39 | { |
84384f5b UD |
40 | struct link_map *l, *match; |
41 | ||
42 | /* Find the highest-addressed object that CALLER is not below. */ | |
43 | match = NULL; | |
44 | for (l = _dl_loaded; l; l = l->l_next) | |
45 | if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr)) | |
46 | match = l; | |
47 | ||
48 | if (! match) | |
49 | _dl_signal_error (0, NULL, _("\ | |
50 | RTLD_NEXT used in code not dynamically loaded")); | |
51 | ||
52 | l = match; | |
53 | while (l->l_loader) | |
54 | l = l->l_loader; | |
55 | ||
56 | loadbase = _dl_lookup_symbol_skip | |
57 | (name, &ref, &_dl_loaded, NULL, l, 0); | |
622586fb RM |
58 | } |
59 | else | |
60 | { | |
84384f5b UD |
61 | /* Search the scope of the given object. */ |
62 | struct link_map *map = handle; | |
63 | struct link_map *mapscope[2] = { map, NULL }; | |
64 | loadbase = _dl_lookup_symbol (name, &ref, mapscope, map->l_name, 0); | |
622586fb | 65 | } |
d66e34cd RM |
66 | } |
67 | ||
f68b86cc | 68 | return _dlerror_run (doit) ? NULL : (void *) (loadbase + ref->st_value); |
d66e34cd | 69 | } |