Leaked source code of windows server 2003
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3.7 KiB

/*++
Copyright (c) 1997-1999 Microsoft Corporation
Module Name:
wlnotify.cxx
Abstract:
Main source file for the common DLL that receives Winlogon
notifications.
Author:
Gopal Parupudi <GopalP>
Notes:
A. BACKGROUND:
In Windows 2000, Winlogon allows components to hook into various events
like Logon, Logoff, Lock, Unlock etc via the new Winlogon notifications.
Components are required to write a DLL with exports (that process these
notifications) and add them to the registry under HKLM\Software\Microsoft
\Windows NT\CurrentVersion\Winlogon\Notify Key.
B. PERFORMANCE ISSUE:
As more and more components started hooking into these notifications, the
number of DLLs that were being loaded increased. These notification DLLs
also brought in other DLLs that they were implicitly linked to them and
that were not related to processing of these notifications. This common
DLL is a way to cut down on the number of DLLs that are loaded into the
Winlogon process.
C. HOW TO MERGE YOUR DLL INTO THIS DLL:
In order to merge your DLL into this common notifcation DLL, you need to
take the following steps:
1. Compile and link your notification processing code into a library
that is propagated to $(BASEDIR)\public\sdk\lib directory. Please
ensure that there is no excess baggage in this library.
2. Enlist in \nt\private\dllmerge\wlnotify directory.
3. Modify the sources file to link your library into the DLL.
4. Add your exports to the .def file for this common DLL. Please
ensure that the names of exports reflect the component that is
processing the notification.
5. Add your exports to the Winlogon notification registry key, if
you haven't done so already. Modify the DLL name in this registry
key to point to the common DLL.
6. Remove your standalone notification DLL from the system.
7. Make sure you boot test your changes before checking them in.
Revision History:
GopalP 1/15/1999 Start.
--*/
//
// Includes
//
#include <nt.h>
#include <ntrtl.h>
#include <nturtl.h>
#include <windows.h>
//
// Globals
//
HANDLE ghNotifyHeap;
#ifdef __cplusplus
extern "C" {
#endif
BOOL TSDLLInit(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved);
#ifdef __cplusplus
}
#endif
#define IsTerminalServer() (BOOLEAN)(USER_SHARED_DATA->SuiteMask & (1 << TerminalServer))
//
// Functions
//
extern "C" int APIENTRY
DllMain(
IN HINSTANCE hInstance,
IN DWORD dwReason,
IN LPVOID lpvReserved
)
/*++
Routine Description:
This routine will get called either when a process attaches to this dll
or when a process detaches from this dll.
Arguments:
Standard DllMain signature.
Return Value:
TRUE - Initialization successfully occurred.
FALSE - Insufficient memory is available for the process to attach to
this dll.
--*/
{
BOOL bSuccess;
switch (dwReason)
{
case DLL_PROCESS_ATTACH:
//
// Disable Thread attach/detach calls
//
bSuccess = DisableThreadLibraryCalls(hInstance);
ASSERT(bSuccess == TRUE);
// Use Default Process heap
ghNotifyHeap = GetProcessHeap();
ASSERT(ghNotifyHeap != NULL);
break;
case DLL_PROCESS_DETACH:
break;
}
if (IsTerminalServer()) {
TSDLLInit(hInstance, dwReason, lpvReserved);
}
return(TRUE);
}