diff options
Diffstat (limited to 'dlfcn/dlsym.c')
| -rw-r--r-- | dlfcn/dlsym.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/dlfcn/dlsym.c b/dlfcn/dlsym.c index ec071d9de8..76dda5973f 100644 --- a/dlfcn/dlsym.c +++ b/dlfcn/dlsym.c @@ -1,5 +1,5 @@ /* Look up a 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 dlsym_args { /* The arguments to dlsym_doit. */ @@ -48,5 +50,12 @@ dlsym (void *handle, const char *name) args.handle = handle; args.name = name; - return (_dlerror_run (dlsym_doit, &args) ? NULL : args.sym); + /* 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; } |