| // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Main entry point for a DLL that can be instructed to crash on |
| // load or unload by setting an environment variable appropriately. |
| // |
| // Note: This code has no CRT to lean on, because some versions of the CRT |
| // have a bug whereby they leave dangling state after taking an exception |
| // during DLL_PROCESS_ATTACH. This in turn causes the loading process to |
| // crash on exit. To work around this, this DLL has its entrypoint set |
| // to the DllMain routine and does not link with the CRT. |
| |
| #include <windows.h> |
| |
| #include "crash_dll.h" |
| |
| void Crash() { |
| char* null_pointer = reinterpret_cast<char*>(kCrashAddress); |
| |
| *null_pointer = '\0'; |
| } |
| |
| void CrashConditionally(const wchar_t* name) { |
| wchar_t value[1024]; |
| DWORD ret = ::GetEnvironmentVariable(name, value, ARRAYSIZE(value)); |
| if (ret != 0 || ERROR_ENVVAR_NOT_FOUND != ::GetLastError()) |
| Crash(); |
| } |
| |
| extern "C" BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, |
| LPVOID reserved) { |
| if (reason == DLL_PROCESS_ATTACH) |
| CrashConditionally(kCrashOnLoadMode); |
| else if (reason == DLL_PROCESS_DETACH) |
| CrashConditionally(kCrashOnUnloadMode); |
| |
| return 1; |
| } |