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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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