1 /* Look up a versioned symbol in a shared object loaded by `dlopen'.
2 Copyright (C) 1995-2014 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 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.
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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
24 #if !defined SHARED && defined IS_IN_libdl
28 dlvsym (void *handle
, const char *name
, const char *version_str
)
30 return __dlvsym (handle
, name
, version_str
, RETURN_ADDRESS (0));
37 /* The arguments to dlvsym_doit. */
43 /* The return values of dlvsym_doit. */
51 struct dlvsym_args
*args
= (struct dlvsym_args
*)a
;
53 args
->sym
= _dl_vsym (args
->handle
, args
->name
, args
->version
, args
->who
);
57 __dlvsym (void *handle
, const char *name
, const char *version_str
61 if (__builtin_expect (_dlfcn_hook
!= NULL
, 0))
62 return _dlfcn_hook
->dlvsym (handle
, name
, version_str
, DL_CALLER
);
65 struct dlvsym_args args
;
69 args
.version
= version_str
;
71 /* Protect against concurrent loads and unloads. */
72 __rtld_lock_lock_recursive (GL(dl_load_lock
));
74 void *result
= (_dlerror_run (dlvsym_doit
, &args
) ? NULL
: args
.sym
);
76 __rtld_lock_unlock_recursive (GL(dl_load_lock
));
81 weak_alias (__dlvsym
, dlvsym
)