diff options
Diffstat (limited to 'REORG.TODO/dlfcn/dlvsym.c')
-rw-r--r-- | REORG.TODO/dlfcn/dlvsym.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/REORG.TODO/dlfcn/dlvsym.c b/REORG.TODO/dlfcn/dlvsym.c new file mode 100644 index 0000000000..5ed220b77c --- /dev/null +++ b/REORG.TODO/dlfcn/dlvsym.c @@ -0,0 +1,83 @@ +/* Look up a versioned 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 * +weak_function +dlvsym (void *handle, const char *name, const char *version_str) +{ + return __dlvsym (handle, name, version_str, RETURN_ADDRESS (0)); +} + +#else + +struct dlvsym_args +{ + /* The arguments to dlvsym_doit. */ + void *handle; + const char *name; + const char *version; + void *who; + + /* The return values of dlvsym_doit. */ + void *sym; +}; + + +static void +dlvsym_doit (void *a) +{ + struct dlvsym_args *args = (struct dlvsym_args *)a; + + args->sym = _dl_vsym (args->handle, args->name, args->version, args->who); +} + +void * +__dlvsym (void *handle, const char *name, const char *version_str + DL_CALLER_DECL) +{ +# ifdef SHARED + if (__glibc_unlikely (_dlfcn_hook != NULL)) + return _dlfcn_hook->dlvsym (handle, name, version_str, DL_CALLER); +# endif + + struct dlvsym_args args; + args.handle = handle; + args.name = name; + args.who = DL_CALLER; + args.version = version_str; + + /* Protect against concurrent loads and unloads. */ + __rtld_lock_lock_recursive (GL(dl_load_lock)); + + void *result = (_dlerror_run (dlvsym_doit, &args) ? NULL : args.sym); + + __rtld_lock_unlock_recursive (GL(dl_load_lock)); + + return result; +} +# ifdef SHARED +weak_alias (__dlvsym, dlvsym) +# endif +#endif |