/* Look up a symbol in a shared object loaded by `dlopen'. Copyright (C) 1995-2000, 2004 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <dlfcn.h> #include <stddef.h> #include <ldsodefs.h> #if !defined SHARED && defined IS_IN_libdl void * dlsym (void *handle, const char *name) { return __dlsym (handle, name, RETURN_ADDRESS (0)); } #else struct dlsym_args { /* The arguments to dlsym_doit. */ void *handle; const char *name; void *who; /* The return value of dlsym_doit. */ void *sym; }; static void dlsym_doit (void *a) { struct dlsym_args *args = (struct dlsym_args *) a; args->sym = _dl_sym (args->handle, args->name, args->who); } void * __dlsym (void *handle, const char *name DL_CALLER_DECL) { # ifdef SHARED if (__builtin_expect (_dlfcn_hook != NULL, 0)) return _dlfcn_hook->dlsym (handle, name, DL_CALLER); # endif struct dlsym_args args; args.who = DL_CALLER; args.handle = handle; args.name = name; /* Protect against concurrent loads and unloads. */ __rtld_lock_lock_recursive (GL(dl_load_lock)); void *result = (_dlerror_run (dlsym_doit, &args) ? NULL : args.sym); __rtld_lock_unlock_recursive (GL(dl_load_lock)); return result; } # ifdef SHARED strong_alias (__dlsym, dlsym) # endif #endif