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authorUlrich Drepper <drepper@redhat.com>2004-02-21 01:06:02 +0000
committerUlrich Drepper <drepper@redhat.com>2004-02-21 01:06:02 +0000
commita461b14777bc56a19d3252d7fa5b47ee598757a0 (patch)
treecd4ec84558ed8db4b6a0af36d57f56328ee686ce /dlfcn/dlvsym.c
parent5990e1fe120708a10ae8ab0caf4a284b5d6b10f8 (diff)
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Update.
2004-02-20 Ulrich Drepper <drepper@redhat.com> * dlfcn/dlsym.c: Get ld.so loading lock before the call into ld.so. * dlfcn/dlvsym.c: Likewise. * elf/dl-addr.c: Get loading lock while using _dl_loaded data. * elf/dl-fini.c: Likewise. Patch by Shunichi Sagawa <s-sagawa@jp.fujitsu.com>.
Diffstat (limited to 'dlfcn/dlvsym.c')
-rw-r--r--dlfcn/dlvsym.c13
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)