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/* $Id: dllmain.cpp $ */
/** @file
* VBoxC - COM DLL exports and DLL init/term.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "VBox/com/defs.h"
#include <SessionImpl.h>
#include <VirtualBoxClientImpl.h>
#include <iprt/initterm.h>
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
static ATL::CComModule *g_pAtlComModule;
BEGIN_OBJECT_MAP(ObjectMap)
OBJECT_ENTRY(CLSID_Session, Session)
OBJECT_ENTRY(CLSID_VirtualBoxClient, VirtualBoxClient)
END_OBJECT_MAP()
/////////////////////////////////////////////////////////////////////////////
// DLL Entry Point
extern "C"
BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpReserved*/)
{
if (dwReason == DLL_PROCESS_ATTACH)
{
// idempotent, so doesn't harm, and needed for COM embedding scenario
RTR3InitDll(RTR3INIT_FLAGS_UNOBTRUSIVE);
g_pAtlComModule = new(ATL::CComModule);
if (!g_pAtlComModule)
return FALSE;
g_pAtlComModule->Init(ObjectMap, hInstance, &LIBID_VirtualBox);
DisableThreadLibraryCalls(hInstance);
}
else if (dwReason == DLL_PROCESS_DETACH)
{
if (g_pAtlComModule)
{
g_pAtlComModule->Term();
delete g_pAtlComModule;
g_pAtlComModule = NULL;
}
}
return TRUE;
}
/////////////////////////////////////////////////////////////////////////////
// Used to determine whether the DLL can be unloaded by OLE
STDAPI DllCanUnloadNow(void)
{
AssertReturn(g_pAtlComModule, S_OK);
LONG const cLocks = g_pAtlComModule->GetLockCount();
Assert(cLocks >= VirtualBoxClient::s_cUnnecessaryAtlModuleLocks);
return cLocks <= VirtualBoxClient::s_cUnnecessaryAtlModuleLocks ? S_OK : S_FALSE;
}
/////////////////////////////////////////////////////////////////////////////
// Returns a class factory to create an object of the requested type
STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
{
AssertReturn(g_pAtlComModule, E_UNEXPECTED);
return g_pAtlComModule->GetClassObject(rclsid, riid, ppv);
}
/////////////////////////////////////////////////////////////////////////////
// DllRegisterServer - Adds entries to the system registry
STDAPI DllRegisterServer(void)
{
#ifndef VBOX_WITH_MIDL_PROXY_STUB
// registers object, typelib and all interfaces in typelib
AssertReturn(g_pAtlComModule, E_UNEXPECTED);
return g_pAtlComModule->RegisterServer(TRUE);
#else
return S_OK; /* VBoxProxyStub does all the work, no need to duplicate it here. */
#endif
}
/////////////////////////////////////////////////////////////////////////////
// DllUnregisterServer - Removes entries from the system registry
STDAPI DllUnregisterServer(void)
{
#ifndef VBOX_WITH_MIDL_PROXY_STUB
AssertReturn(g_pAtlComModule, E_UNEXPECTED);
HRESULT hrc = g_pAtlComModule->UnregisterServer(TRUE);
return hrc;
#else
return S_OK; /* VBoxProxyStub does all the work, no need to duplicate it here. */
#endif
}
#ifdef RT_OS_WINDOWS
/*
* HACK ALERT! Really ugly trick to make the VirtualBoxClient object go away
* when nobody uses it anymore. This is to prevent its uninit()
* method from accessing IVirtualBox and similar proxy stubs after
* COM has been officially shut down.
*
* It is simply TOO LATE to destroy the client object from DllMain/detach!
*
* This hack ASSUMES ObjectMap order.
* This hack is subject to a re-instantiation race.
*/
ULONG VirtualBoxClient::InternalRelease()
{
ULONG cRefs = VirtualBoxClientWrap::InternalRelease();
# ifdef DEBUG_bird
char szMsg[64];
RTStrPrintf(szMsg, sizeof(szMsg), "VirtualBoxClient: cRefs=%d\n", cRefs);
OutputDebugStringA(szMsg);
# endif
# if 1 /* enable ugly hack */
if (cRefs == 1)
{
/* Make the factory to drop its reference. */
if (ObjectMap[1].pCF)
{
InternalAddRef();
CMyComClassFactorySingleton<VirtualBoxClient> *pFactory;
pFactory = dynamic_cast<CMyComClassFactorySingleton<VirtualBoxClient> *>(ObjectMap[1].pCF);
Assert(pFactory);
if (pFactory)
{
IUnknown *pUnknown = pFactory->m_spObj;
pFactory->m_spObj = NULL;
if (pUnknown)
pUnknown->Release();
}
cRefs = VirtualBoxClientWrap::InternalRelease();
}
}
# endif
return cRefs;
}
#endif
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