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1 // Copyright (c) 2010 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 // Main entry point for a DLL that can be instructed to crash on | |
6 // load or unload by setting an environment variable appropriately. | |
7 // | |
8 // Note: This code has no CRT to lean on, because some versions of the CRT | |
9 // have a bug whereby they leave dangling state after taking an exception | |
10 // during DLL_PROCESS_ATTACH. This in turn causes the loading process to | |
11 // crash on exit. To work around this, this DLL has its entrypoint set | |
12 // to the DllMain routine and does not link with the CRT. | |
13 | |
14 #include <windows.h> | |
15 | |
16 #include "crash_dll.h" | |
17 | |
18 void Crash() { | |
19 char* null_pointer = reinterpret_cast<char*>(kCrashAddress); | |
20 | |
21 *null_pointer = '\0'; | |
22 } | |
23 | |
24 void CrashConditionally(const wchar_t* name) { | |
25 wchar_t value[1024]; | |
26 DWORD ret = ::GetEnvironmentVariable(name, value, ARRAYSIZE(value)); | |
27 if (ret != 0 || ERROR_ENVVAR_NOT_FOUND != ::GetLastError()) | |
28 Crash(); | |
29 } | |
30 | |
31 extern "C" BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, | |
32 LPVOID reserved) { | |
33 if (reason == DLL_PROCESS_ATTACH) | |
34 CrashConditionally(kCrashOnLoadMode); | |
35 else if (reason == DLL_PROCESS_DETACH) | |
36 CrashConditionally(kCrashOnUnloadMode); | |
37 | |
38 return 1; | |
39 } | |
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