1 /* Look up a 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 && IS_IN (libdl)
27 dlsym (void *handle, const char *name)
29 return __dlsym (handle, name, RETURN_ADDRESS (0));
36 /* The arguments to dlsym_doit. */
41 /* The return value of dlsym_doit. */
48 struct dlsym_args *args = (struct dlsym_args *) a;
50 args->sym = _dl_sym (args->handle, args->name, args->who);
55 __dlsym (void *handle, const char *name DL_CALLER_DECL)
58 if (__glibc_unlikely (_dlfcn_hook != NULL))
59 return _dlfcn_hook->dlsym (handle, name, DL_CALLER);
62 struct dlsym_args args;
67 /* Protect against concurrent loads and unloads. */
68 __rtld_lock_lock_recursive (GL(dl_load_lock));
70 void *result = (_dlerror_run (dlsym_doit, &args) ? NULL : args.sym);
72 __rtld_lock_unlock_recursive (GL(dl_load_lock));
77 strong_alias (__dlsym, dlsym)