1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/memory/scoped_native_library.h"
6#if defined(OS_WIN)
7#include "base/file_path.h"
8#endif
9
10#include "testing/gtest/include/gtest/gtest.h"
11
12// Tests whether or not a function pointer retrieved via ScopedNativeLibrary
13// is available only in a scope.
14TEST(ScopedNativeLibrary, Basic) {
15#if defined(OS_WIN)
16  // Get the pointer to DirectDrawCreate() from "ddraw.dll" and verify it
17  // is valid only in this scope.
18  // FreeLibrary() doesn't actually unload a DLL until its reference count
19  // becomes zero, i.e. this function pointer is still valid if the DLL used
20  // in this test is also used by another part of this executable.
21  // So, this test uses "ddraw.dll", which is not used by Chrome at all but
22  // installed on all versions of Windows.
23  FARPROC test_function;
24  {
25    FilePath path(base::GetNativeLibraryName(L"ddraw"));
26    base::ScopedNativeLibrary library(path);
27    test_function = reinterpret_cast<FARPROC>(
28        library.GetFunctionPointer("DirectDrawCreate"));
29    EXPECT_EQ(0, IsBadCodePtr(test_function));
30  }
31  EXPECT_NE(0, IsBadCodePtr(test_function));
32#endif
33}
34