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// 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;
}
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