diff options
Diffstat (limited to 'REORG.TODO/dlfcn/dlsym.c')
-rw-r--r-- | REORG.TODO/dlfcn/dlsym.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/REORG.TODO/dlfcn/dlsym.c b/REORG.TODO/dlfcn/dlsym.c new file mode 100644 index 0000000000..7976c5f75c --- /dev/null +++ b/REORG.TODO/dlfcn/dlsym.c @@ -0,0 +1,79 @@ +/* Look up a symbol in a shared object loaded by `dlopen'. + Copyright (C) 1995-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#include <dlfcn.h> +#include <stddef.h> + +#include <ldsodefs.h> + +#if !defined SHARED && 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 (__glibc_unlikely (_dlfcn_hook != NULL)) + 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 |