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94e365c6 | 1 | /* Look up a versioned symbol in a shared object loaded by `dlopen'. |
dff8da6b | 2 | Copyright (C) 1995-2024 Free Software Foundation, Inc. |
afd4eb37 | 3 | This file is part of the GNU C Library. |
d66e34cd | 4 | |
afd4eb37 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
d66e34cd | 9 | |
afd4eb37 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
d66e34cd | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
d66e34cd | 18 | |
d66e34cd | 19 | #include <dlfcn.h> |
a461b147 | 20 | #include <ldsodefs.h> |
add8d7ea FW |
21 | #include <shlib-compat.h> |
22 | #include <stddef.h> | |
5f21997b | 23 | |
94e365c6 | 24 | struct dlvsym_args |
d66e34cd | 25 | { |
94e365c6 UD |
26 | /* The arguments to dlvsym_doit. */ |
27 | void *handle; | |
28 | const char *name; | |
29 | const char *version; | |
30 | void *who; | |
31 | ||
32 | /* The return values of dlvsym_doit. */ | |
33 | void *sym; | |
993b3242 UD |
34 | }; |
35 | ||
993b3242 | 36 | static void |
94e365c6 | 37 | dlvsym_doit (void *a) |
993b3242 | 38 | { |
add8d7ea | 39 | struct dlvsym_args *args = (struct dlvsym_args *) a; |
993b3242 | 40 | |
94e365c6 | 41 | args->sym = _dl_vsym (args->handle, args->name, args->version, args->who); |
993b3242 UD |
42 | } |
43 | ||
add8d7ea FW |
44 | static void * |
45 | dlvsym_implementation (void *handle, const char *name, const char *version, | |
46 | void *dl_caller) | |
993b3242 | 47 | { |
5f21997b | 48 | struct dlvsym_args args; |
add8d7ea | 49 | args.who = dl_caller; |
94e365c6 UD |
50 | args.handle = handle; |
51 | args.name = name; | |
add8d7ea | 52 | args.version = version; |
d66e34cd | 53 | |
a461b147 UD |
54 | /* Protect against concurrent loads and unloads. */ |
55 | __rtld_lock_lock_recursive (GL(dl_load_lock)); | |
56 | ||
57 | void *result = (_dlerror_run (dlvsym_doit, &args) ? NULL : args.sym); | |
58 | ||
59 | __rtld_lock_unlock_recursive (GL(dl_load_lock)); | |
60 | ||
61 | return result; | |
d66e34cd | 62 | } |
add8d7ea FW |
63 | |
64 | #ifdef SHARED | |
65 | void * | |
66 | ___dlvsym (void *handle, const char *name, const char *version) | |
67 | { | |
8dcb6d0a | 68 | if (GLRO (dl_dlfcn_hook) != NULL) |
466c1ea1 FW |
69 | return GLRO (dl_dlfcn_hook)->dlvsym (handle, name, version, |
70 | RETURN_ADDRESS (0)); | |
add8d7ea FW |
71 | else |
72 | return dlvsym_implementation (handle, name, version, RETURN_ADDRESS (0)); | |
73 | } | |
74 | versioned_symbol (libc, ___dlvsym, dlvsym, GLIBC_2_34); | |
75 | ||
76 | # if OTHER_SHLIB_COMPAT (libdl, GLIBC_2_1, GLIBC_2_34) | |
77 | compat_symbol (libdl, ___dlvsym, dlvsym, GLIBC_2_1); | |
5f21997b | 78 | # endif |
add8d7ea FW |
79 | |
80 | #else /* !SHARED */ | |
81 | /* Also used with _dlfcn_hook. */ | |
82 | void * | |
83 | __dlvsym (void *handle, const char *name, const char *version, void *dl_caller) | |
84 | { | |
85 | return dlvsym_implementation (handle, name, version, dl_caller); | |
86 | } | |
87 | ||
88 | void * | |
89 | ___dlvsym (void *handle, const char *name, const char *version) | |
90 | { | |
91 | return __dlvsym (handle, name, version, RETURN_ADDRESS (0)); | |
92 | } | |
93 | weak_alias (___dlvsym, dlvsym) | |
94 | #endif /* !SHARED */ |