diff options
Diffstat (limited to 'dlfcn/dlvsym.c')
| -rw-r--r-- | dlfcn/dlvsym.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/dlfcn/dlvsym.c b/dlfcn/dlvsym.c index 62415fe..2486845 100644 --- a/dlfcn/dlvsym.c +++ b/dlfcn/dlvsym.c @@ -1,5 +1,5 @@ /* Look up a versioned symbol in a shared object loaded by `dlopen'. - Copyright (C) 1995, 96, 97, 98, 99, 2000 Free Software Foundation, Inc. + 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 @@ -20,6 +20,8 @@ #include <dlfcn.h> #include <stddef.h> +#include <ldsodefs.h> + struct dlvsym_args { /* The arguments to dlvsym_doit. */ @@ -51,6 +53,13 @@ __dlvsym (void *handle, const char *name, const char *version_str) args.who = RETURN_ADDRESS (0); args.version = version_str; - return (_dlerror_run (dlvsym_doit, &args) ? NULL : args.sym); + /* 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; } weak_alias (__dlvsym, dlvsym) |