desktop.c File Reference

#include <win32k.h>
#include <reactos/buildno.h>

Include dependency graph for desktop.c:

Go to the source code of this file.

Functions
	DBG_DEFAULT_CHANNEL (UserDesktop)
static NTSTATUS	UserInitializeDesktop (PDESKTOP pdesk, PUNICODE_STRING DesktopName, PWINSTATION_OBJECT pwinsta)
static NTSTATUS	IntMapDesktopView (IN PDESKTOP pdesk)
static NTSTATUS	IntUnmapDesktopView (IN PDESKTOP pdesk)
static VOID	IntFreeDesktopHeap (IN PDESKTOP pdesk)
NTSTATUS APIENTRY	IntDesktopObjectParse (IN PVOID ParseObject, IN PVOID ObjectType, IN OUT PACCESS_STATE AccessState, IN KPROCESSOR_MODE AccessMode, IN ULONG Attributes, IN OUT PUNICODE_STRING CompleteName, IN OUT PUNICODE_STRING RemainingName, IN OUT PVOID Context OPTIONAL, IN PSECURITY_QUALITY_OF_SERVICE SecurityQos OPTIONAL, OUT PVOID *Object)
NTSTATUS NTAPI	IntDesktopObjectDelete (_In_ PVOID Parameters)
NTSTATUS NTAPI	IntDesktopOkToClose (_In_ PVOID Parameters)
NTSTATUS NTAPI	IntDesktopObjectOpen (_In_ PVOID Parameters)
NTSTATUS NTAPI	IntDesktopObjectClose (_In_ PVOID Parameters)
NTSTATUS NTAPI	InitDesktopImpl (VOID)
static NTSTATUS	GetSystemVersionString (OUT PWSTR pwszzVersion, IN SIZE_T cchDest, IN BOOLEAN InSafeMode, IN BOOLEAN AppendNtSystemRoot)
NTSTATUS FASTCALL	IntResolveDesktop (IN PEPROCESS Process, IN PUNICODE_STRING DesktopPath, IN BOOL bInherit, OUT HWINSTA *phWinSta, OUT HDESK *phDesktop)
NTSTATUS FASTCALL	IntValidateDesktopHandle (HDESK Desktop, KPROCESSOR_MODE AccessMode, ACCESS_MASK DesiredAccess, PDESKTOP *Object)
PDESKTOP FASTCALL	IntGetActiveDesktop (VOID)
HDESK FASTCALL	IntGetDesktopObjectHandle (PDESKTOP DesktopObject)
PUSER_MESSAGE_QUEUE FASTCALL	IntGetFocusMessageQueue (VOID)
VOID FASTCALL	IntSetFocusMessageQueue (PUSER_MESSAGE_QUEUE NewQueue)
PWND FASTCALL	IntGetThreadDesktopWindow (PTHREADINFO pti)
PWND FASTCALL	co_GetDesktopWindow (PWND pWnd)
HWND FASTCALL	IntGetDesktopWindow (VOID)
PWND FASTCALL	UserGetDesktopWindow (VOID)
HWND FASTCALL	IntGetMessageWindow (VOID)
PWND FASTCALL	UserGetMessageWindow (VOID)
HWND FASTCALL	IntGetCurrentThreadDesktopWindow (VOID)
BOOL FASTCALL	DesktopWindowProc (PWND Wnd, UINT Msg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
BOOL FASTCALL	UserMessageWindowProc (PWND pwnd, UINT Msg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
VOID NTAPI	DesktopThreadMain (VOID)
HDC FASTCALL	UserGetDesktopDC (ULONG DcType, BOOL bAltDc, BOOL ValidatehWnd)
VOID APIENTRY	UserRedrawDesktop (VOID)
NTSTATUS FASTCALL	co_IntShowDesktop (PDESKTOP Desktop, ULONG Width, ULONG Height, BOOL bRedraw)
NTSTATUS FASTCALL	IntHideDesktop (PDESKTOP Desktop)
static HWND *FASTCALL	UserBuildShellHookHwndList (PDESKTOP Desktop)
VOID	co_IntShellHookNotify (WPARAM Message, WPARAM wParam, LPARAM lParam)
BOOL	IntRegisterShellHookWindow (HWND hWnd)
BOOL	IntDeRegisterShellHookWindow (HWND hWnd)
static VOID	IntFreeDesktopHeap (IN OUT PDESKTOP Desktop)
BOOL FASTCALL	IntPaintDesktop (HDC hDC)
NTSTATUS FASTCALL	IntCreateDesktop (OUT HDESK *phDesktop, IN POBJECT_ATTRIBUTES ObjectAttributes, IN KPROCESSOR_MODE AccessMode, IN PUNICODE_STRING lpszDesktopDevice OPTIONAL, IN LPDEVMODEW lpdmw OPTIONAL, IN DWORD dwFlags, IN ACCESS_MASK dwDesiredAccess)
HDESK APIENTRY	NtUserCreateDesktop (POBJECT_ATTRIBUTES ObjectAttributes, PUNICODE_STRING lpszDesktopDevice, LPDEVMODEW lpdmw, DWORD dwFlags, ACCESS_MASK dwDesiredAccess)
HDESK APIENTRY	NtUserOpenDesktop (POBJECT_ATTRIBUTES ObjectAttributes, DWORD dwFlags, ACCESS_MASK dwDesiredAccess)
HDESK	UserOpenInputDesktop (DWORD dwFlags, BOOL fInherit, ACCESS_MASK dwDesiredAccess)
HDESK APIENTRY	NtUserOpenInputDesktop (DWORD dwFlags, BOOL fInherit, ACCESS_MASK dwDesiredAccess)
BOOL APIENTRY	NtUserCloseDesktop (HDESK hDesktop)
BOOL APIENTRY	NtUserPaintDesktop (HDC hDC)
HDESK NTAPI	NtUserResolveDesktop (IN HANDLE ProcessHandle, IN PUNICODE_STRING DesktopPath, IN BOOL bInherit, OUT HWINSTA *phWinSta)
BOOL APIENTRY	NtUserSwitchDesktop (HDESK hdesk)
HDESK APIENTRY	NtUserGetThreadDesktop (DWORD dwThreadId, HDESK hConsoleDesktop)
BOOL	IntSetThreadDesktop (IN HDESK hDesktop, IN BOOL FreeOnFailure)
BOOL APIENTRY	NtUserSetThreadDesktop (HDESK hDesktop)

Variables
DWORD	gdwDesktopSectionSize = 512
DWORD	gdwNOIOSectionSize = 128
PDESKTOP	gpdeskInputDesktop = NULL
HDC	ScreenDeviceContext = NULL
PTHREADINFO	gptiDesktopThread = NULL
HCURSOR	gDesktopCursor = NULL
PKEVENT	gpDesktopThreadStartedEvent = NULL

Function Documentation

co_GetDesktopWindow()

PWND FASTCALL co_GetDesktopWindow

(

PWND

pWnd

)

Definition at line 1330 of file desktop.c.

{
    if (pWnd->head.rpdesk &&
        pWnd->head.rpdesk->pDeskInfo)
        return pWnd->head.rpdesk->pDeskInfo->spwnd;
    return NULL;
}

Referenced by co_IntSendActivateMessages(), co_IntSetParent(), co_UserCreateWindowEx(), IntDefWindowProc(), IntIsTopLevelWindow(), and IntWinListOwnedPopups().

co_IntShellHookNotify()

VOID co_IntShellHookNotify	(	WPARAM	Message,
		WPARAM	wParam,
		LPARAM	lParam
	)

Definition at line 1656 of file desktop.c.

{
    PDESKTOP Desktop = IntGetActiveDesktop();
    HWND* HwndList;

    if (!gpsi->uiShellMsg)
    {
        gpsi->uiShellMsg = IntAddAtom(L"SHELLHOOK");

        TRACE("MsgType = %x\n", gpsi->uiShellMsg);
        if (!gpsi->uiShellMsg)
            ERR("LastError: %x\n", EngGetLastError());
    }

    if (!Desktop)
    {
        TRACE("IntShellHookNotify: No desktop!\n");
        return;
    }

    // Allow other devices have a shot at foreground.
    if (Message == HSHELL_APPCOMMAND) ptiLastInput = NULL;

    // FIXME: System Tray Support.

    HwndList = UserBuildShellHookHwndList(Desktop);
    if (HwndList)
    {
        HWND* cursor = HwndList;

        for (; *cursor; cursor++)
        {
            TRACE("Sending notify\n");
            UserPostMessage(*cursor,
                            gpsi->uiShellMsg,
                            Message,
                            (Message == HSHELL_LANGUAGE ? lParam : (LPARAM)wParam) );
/*            co_IntPostOrSendMessage(*cursor,
                                    gpsi->uiShellMsg,
                                    Message,
                                    (Message == HSHELL_LANGUAGE ? lParam : (LPARAM)wParam) );*/
        }

        ExFreePoolWithTag(HwndList, USERTAG_WINDOWLIST);
    }

    if (ISITHOOKED(WH_SHELL))
    {
        co_HOOK_CallHooks(WH_SHELL, Message, wParam, lParam);
    }
}

Referenced by co_UserCreateWindowEx(), co_UserDestroyWindow(), co_UserProcessHotKeys(), co_WinPosSetWindowPos(), DefSetText(), IntDefWindowProc(), NtUserActivateKeyboardLayout(), NtUserCallHwndLock(), NtUserDefSetText(), NtUserLoadKeyboardLayoutEx(), and UpdateShellHook().

co_IntShowDesktop()

NTSTATUS FASTCALL co_IntShowDesktop	(	PDESKTOP	Desktop,
		ULONG	Width,
		ULONG	Height,
		BOOL	bRedraw
	)

Definition at line 1581 of file desktop.c.

{
    PWND pwnd = Desktop->pDeskInfo->spwnd;
    UINT flags = SWP_NOACTIVATE|SWP_NOZORDER|SWP_SHOWWINDOW;
    ASSERT(pwnd);

    if (!bRedraw)
        flags |= SWP_NOREDRAW;

    co_WinPosSetWindowPos(pwnd, NULL, 0, 0, Width, Height, flags);

    if (bRedraw)
        co_UserRedrawWindow( pwnd, NULL, 0, RDW_UPDATENOW | RDW_ALLCHILDREN | RDW_INVALIDATE );

    return STATUS_SUCCESS;
}

Referenced by co_IntInitializeDesktopGraphics(), and NtUserSwitchDesktop().

DBG_DEFAULT_CHANNEL()

DBG_DEFAULT_CHANNEL

(

UserDesktop

)

DesktopThreadMain()

VOID NTAPI DesktopThreadMain

(

VOID

)

Definition at line 1508 of file desktop.c.

{
    BOOL Ret;
    MSG Msg;

    gptiDesktopThread = PsGetCurrentThreadWin32Thread();

    UserEnterExclusive();

    /* Register system classes. This thread does not belong to any desktop so the
       classes will be allocated from the shared heap */
    UserRegisterSystemClasses();

    KeSetEvent(gpDesktopThreadStartedEvent, IO_NO_INCREMENT, FALSE);

    while (TRUE)
    {
        Ret = co_IntGetPeekMessage(&Msg, 0, 0, 0, PM_REMOVE, TRUE);
        if (Ret)
        {
            IntDispatchMessage(&Msg);
        }
    }

    UserLeave();
}

Referenced by UserSystemThreadProc().

DesktopWindowProc()

BOOL FASTCALL DesktopWindowProc	(	PWND	Wnd,
		UINT	Msg,
		WPARAM	wParam,
		LPARAM	lParam,
		LRESULT *	lResult
	)

Definition at line 1401 of file desktop.c.

{
    PAINTSTRUCT Ps;
    ULONG Value;
    //ERR("DesktopWindowProc\n");

    *lResult = 0;

    switch (Msg)
    {
        case WM_NCCREATE:
            if (!Wnd->fnid)
            {
                Wnd->fnid = FNID_DESKTOP;
            }
            *lResult = (LRESULT)TRUE;
            return TRUE;

        case WM_CREATE:
            Value = HandleToULong(PsGetCurrentProcessId());
            // Save Process ID
            co_UserSetWindowLong(UserHMGetHandle(Wnd), DT_GWL_PROCESSID, Value, FALSE);
            Value = HandleToULong(PsGetCurrentThreadId());
            // Save Thread ID
            co_UserSetWindowLong(UserHMGetHandle(Wnd), DT_GWL_THREADID, Value, FALSE);
        case WM_CLOSE:
            return TRUE;

        case WM_DISPLAYCHANGE:
            co_WinPosSetWindowPos(Wnd, 0, 0, 0, LOWORD(lParam), HIWORD(lParam), SWP_NOZORDER | SWP_NOACTIVATE);
            return TRUE;

        case WM_ERASEBKGND:
            IntPaintDesktop((HDC)wParam);
            *lResult = 1;
            return TRUE;

        case WM_PAINT:
        {
            if (IntBeginPaint(Wnd, &Ps))
            {
                IntEndPaint(Wnd, &Ps);
            }
            return TRUE;
        }
        case WM_SYSCOLORCHANGE:
            co_UserRedrawWindow(Wnd, NULL, NULL, RDW_INVALIDATE|RDW_ERASE|RDW_ALLCHILDREN);
            return TRUE;

        case WM_SETCURSOR:
        {
            PCURICON_OBJECT pcurOld, pcurNew;
            pcurNew = UserGetCurIconObject(gDesktopCursor);
            if (!pcurNew)
            {
                return TRUE;
            }

            pcurNew->CURSORF_flags |= CURSORF_CURRENT;
            pcurOld = UserSetCursor(pcurNew, FALSE);
            if (pcurOld)
            {
                pcurOld->CURSORF_flags &= ~CURSORF_CURRENT;
                UserDereferenceObject(pcurOld);
            }
            return TRUE;
        }

        case WM_WINDOWPOSCHANGING:
        {
            PWINDOWPOS pWindowPos = (PWINDOWPOS)lParam;
            if ((pWindowPos->flags & SWP_SHOWWINDOW) != 0)
            {
                HDESK hdesk = UserOpenInputDesktop(0, FALSE, DESKTOP_ALL_ACCESS);
                IntSetThreadDesktop(hdesk, FALSE);
            }
            break;
        }
        default:
            TRACE("DWP calling IDWP Msg %d\n",Msg);
            //*lResult = IntDefWindowProc(Wnd, Msg, wParam, lParam, FALSE);
    }
    return TRUE; /* We are done. Do not do any callbacks to user mode */
}

Referenced by co_IntSendMessageTimeoutSingle(), co_IntSendMessageWithCallBack(), IntDispatchMessage(), and NtUserMessageCall().

GetSystemVersionString()

static NTSTATUS GetSystemVersionString ( OUT PWSTR  pwszzVersion, IN SIZE_T  cchDest, IN BOOLEAN  InSafeMode, IN BOOLEAN  AppendNtSystemRoot  )

static

Definition at line 267 of file desktop.c.

{
    NTSTATUS Status;

    RTL_OSVERSIONINFOEXW VerInfo;
    UNICODE_STRING BuildLabString;
    UNICODE_STRING CSDVersionString;
    RTL_QUERY_REGISTRY_TABLE VersionConfigurationTable[] =
    {
        {
            NULL,
            RTL_QUERY_REGISTRY_DIRECT,
            L"BuildLab",
            &BuildLabString,
            REG_NONE, NULL, 0
        },
        {
            NULL,
            RTL_QUERY_REGISTRY_DIRECT,
            L"CSDVersion",
            &CSDVersionString,
            REG_NONE, NULL, 0
        },

        {0}
    };

    WCHAR BuildLabBuffer[256];
    WCHAR VersionBuffer[256];
    PWCHAR EndBuffer;

    VerInfo.dwOSVersionInfoSize = sizeof(VerInfo);

    /*
     * This call is uniquely used to retrieve the current CSD numbers.
     * All the rest (major, minor, ...) is either retrieved from the
     * SharedUserData structure, or from the registry.
     */
    RtlGetVersion((PRTL_OSVERSIONINFOW)&VerInfo);

    /*
     * - Retrieve the BuildLab string from the registry (set by the kernel).
     * - In kernel-mode, szCSDVersion is not initialized. Initialize it
     *   and query its value from the registry.
     */
    RtlZeroMemory(BuildLabBuffer, sizeof(BuildLabBuffer));
    RtlInitEmptyUnicodeString(&BuildLabString,
                              BuildLabBuffer,
                              sizeof(BuildLabBuffer));
    RtlZeroMemory(VerInfo.szCSDVersion, sizeof(VerInfo.szCSDVersion));
    RtlInitEmptyUnicodeString(&CSDVersionString,
                              VerInfo.szCSDVersion,
                              sizeof(VerInfo.szCSDVersion));
    Status = RtlQueryRegistryValues(RTL_REGISTRY_WINDOWS_NT,
                                    L"",
                                    VersionConfigurationTable,
                                    NULL,
                                    NULL);
    if (!NT_SUCCESS(Status))
    {
        /* Indicate nothing is there */
        BuildLabString.Length = 0;
        CSDVersionString.Length = 0;
    }
    /* NULL-terminate the strings */
    BuildLabString.Buffer[BuildLabString.Length / sizeof(WCHAR)] = UNICODE_NULL;
    CSDVersionString.Buffer[CSDVersionString.Length / sizeof(WCHAR)] = UNICODE_NULL;

    EndBuffer = VersionBuffer;
    if ( /* VerInfo.wServicePackMajor != 0 && */ CSDVersionString.Length)
    {
        /* Print the version string */
        Status = RtlStringCbPrintfExW(VersionBuffer,
                                      sizeof(VersionBuffer),
                                      &EndBuffer,
                                      NULL,
                                      0,
                                      L": %wZ",
                                      &CSDVersionString);
        if (!NT_SUCCESS(Status))
        {
            /* No version, NULL-terminate the string */
            *EndBuffer = UNICODE_NULL;
        }
    }
    else
    {
        /* No version, NULL-terminate the string */
        *EndBuffer = UNICODE_NULL;
    }

    if (InSafeMode)
    {
        /* String for Safe Mode */
        Status = RtlStringCchPrintfW(pwszzVersion,
                                     cchDest,
                                     L"ReactOS Version %S %wZ (NT %u.%u Build %u%s)\n",
                                     KERNEL_VERSION_STR,
                                     &BuildLabString,
                                     SharedUserData->NtMajorVersion,
                                     SharedUserData->NtMinorVersion,
                                     (VerInfo.dwBuildNumber & 0xFFFF),
                                     VersionBuffer);

        if (AppendNtSystemRoot && NT_SUCCESS(Status))
        {
            Status = RtlStringCbPrintfW(VersionBuffer,
                                        sizeof(VersionBuffer),
                                        L" - %s\n",
                                        SharedUserData->NtSystemRoot);
            if (NT_SUCCESS(Status))
            {
                /* Replace the last newline by a NULL, before concatenating */
                EndBuffer = wcsrchr(pwszzVersion, L'\n');
                if (EndBuffer) *EndBuffer = UNICODE_NULL;

                /* The concatenated string has a terminating newline */
                Status = RtlStringCchCatW(pwszzVersion,
                                          cchDest,
                                          VersionBuffer);
                if (!NT_SUCCESS(Status))
                {
                    /* Concatenation failed, put back the newline */
                    if (EndBuffer) *EndBuffer = L'\n';
                }
            }

            /* Override any failures as the NtSystemRoot string is optional */
            Status = STATUS_SUCCESS;
        }
    }
    else
    {
        /* Multi-string for Normal Mode */
        Status = RtlStringCchPrintfW(pwszzVersion,
                                     cchDest,
                                     L"ReactOS Version %S\n"
                                     L"Build %wZ\n"
                                     L"Reporting NT %u.%u (Build %u%s)\n",
                                     KERNEL_VERSION_STR,
                                     &BuildLabString,
                                     SharedUserData->NtMajorVersion,
                                     SharedUserData->NtMinorVersion,
                                     (VerInfo.dwBuildNumber & 0xFFFF),
                                     VersionBuffer);

        if (AppendNtSystemRoot && NT_SUCCESS(Status))
        {
            Status = RtlStringCbPrintfW(VersionBuffer,
                                        sizeof(VersionBuffer),
                                        L"%s\n",
                                        SharedUserData->NtSystemRoot);
            if (NT_SUCCESS(Status))
            {
                Status = RtlStringCchCatW(pwszzVersion,
                                          cchDest,
                                          VersionBuffer);
            }

            /* Override any failures as the NtSystemRoot string is optional */
            Status = STATUS_SUCCESS;
        }
    }

    if (!NT_SUCCESS(Status))
    {
        /* Fall-back string */
        Status = RtlStringCchPrintfW(pwszzVersion,
                                     cchDest,
                                     L"ReactOS Version %S %wZ\n",
                                     KERNEL_VERSION_STR,
                                     &BuildLabString);
        if (!NT_SUCCESS(Status))
        {
            /* General failure, NULL-terminate the string */
            pwszzVersion[0] = UNICODE_NULL;
        }
    }

    /*
     * Convert the string separators (newlines) into NULLs
     * and NULL-terminate the multi-string.
     */
    while (*pwszzVersion)
    {
        EndBuffer = wcschr(pwszzVersion, L'\n');
        if (!EndBuffer) break;
        pwszzVersion = EndBuffer;

        *pwszzVersion++ = UNICODE_NULL;
    }
    *pwszzVersion = UNICODE_NULL;

    return Status;
}

Referenced by IntPaintDesktop().

InitDesktopImpl()

NTSTATUS NTAPI InitDesktopImpl

(

VOID

)

Definition at line 236 of file desktop.c.

{
    GENERIC_MAPPING IntDesktopMapping = { DESKTOP_READ,
                                          DESKTOP_WRITE,
                                          DESKTOP_EXECUTE,
                                          DESKTOP_ALL_ACCESS};

    /* Set Desktop Object Attributes */
    ExDesktopObjectType->TypeInfo.DefaultNonPagedPoolCharge = sizeof(DESKTOP);
    ExDesktopObjectType->TypeInfo.GenericMapping = IntDesktopMapping;
    ExDesktopObjectType->TypeInfo.ValidAccessMask = DESKTOP_ALL_ACCESS;

    /* Allocate memory for the event structure */
    gpDesktopThreadStartedEvent = ExAllocatePoolWithTag(NonPagedPool,
                                                        sizeof(KEVENT),
                                                        USERTAG_EVENT);
    if (!gpDesktopThreadStartedEvent)
    {
        ERR("Failed to allocate event!\n");
        return STATUS_NO_MEMORY;
    }

    /* Initialize the kernel event */
    KeInitializeEvent(gpDesktopThreadStartedEvent,
                      SynchronizationEvent,
                      FALSE);

    return STATUS_SUCCESS;
}

Referenced by DriverEntry().

IntCreateDesktop()

NTSTATUS FASTCALL IntCreateDesktop	(	OUT HDESK *	phDesktop,
		IN POBJECT_ATTRIBUTES	ObjectAttributes,
		IN KPROCESSOR_MODE	AccessMode,
		IN PUNICODE_STRING lpszDesktopDevice	OPTIONAL,
		IN LPDEVMODEW lpdmw	OPTIONAL,
		IN DWORD	dwFlags,
		IN ACCESS_MASK	dwDesiredAccess
	)

Definition at line 2308 of file desktop.c.

{
    NTSTATUS Status;
    PDESKTOP pdesk = NULL;
    HDESK hDesk;
    BOOLEAN Context = FALSE;
    UNICODE_STRING ClassName;
    LARGE_STRING WindowName;
    BOOL NoHooks = FALSE;
    PWND pWnd = NULL;
    CREATESTRUCTW Cs;
    PTHREADINFO ptiCurrent;
    PCLS pcls;

    TRACE("Enter IntCreateDesktop\n");

    ASSERT(phDesktop);
    *phDesktop = NULL;

    ptiCurrent = PsGetCurrentThreadWin32Thread();
    ASSERT(ptiCurrent);
    ASSERT(gptiDesktopThread);

    /* Turn off hooks when calling any CreateWindowEx from inside win32k */
    NoHooks = (ptiCurrent->TIF_flags & TIF_DISABLEHOOKS);
    ptiCurrent->TIF_flags |= TIF_DISABLEHOOKS;
    ptiCurrent->pClientInfo->dwTIFlags = ptiCurrent->TIF_flags;

    /*
     * Try to open already existing desktop
     */
    Status = ObOpenObjectByName(ObjectAttributes,
                                ExDesktopObjectType,
                                AccessMode,
                                NULL,
                                dwDesiredAccess,
                                (PVOID)&Context,
                                (PHANDLE)&hDesk);
    if (!NT_SUCCESS(Status))
    {
        ERR("ObOpenObjectByName failed to open/create desktop\n");
        goto Quit;
    }

    /* In case the object was not created (eg if it existed), return now */
    if (Context == FALSE)
    {
        TRACE("IntCreateDesktop opened desktop '%wZ'\n", ObjectAttributes->ObjectName);
        Status = STATUS_SUCCESS;
        goto Quit;
    }

    /* Reference the desktop */
    Status = ObReferenceObjectByHandle(hDesk,
                                       0,
                                       ExDesktopObjectType,
                                       KernelMode,
                                       (PVOID*)&pdesk,
                                       NULL);
    if (!NT_SUCCESS(Status))
    {
        ERR("Failed to reference desktop object\n");
        goto Quit;
    }

    /* Get the desktop window class. The thread desktop does not belong to any desktop
     * so the classes created there (including the desktop class) are allocated in the shared heap
     * It would cause problems if we used a class that belongs to the caller
     */
    ClassName.Buffer = WC_DESKTOP;
    ClassName.Length = 0;
    pcls = IntGetAndReferenceClass(&ClassName, 0, TRUE);
    if (pcls == NULL)
    {
        ASSERT(FALSE);
        Status = STATUS_UNSUCCESSFUL;
        goto Quit;
    }

    RtlZeroMemory(&WindowName, sizeof(WindowName));
    RtlZeroMemory(&Cs, sizeof(Cs));
    Cs.x = UserGetSystemMetrics(SM_XVIRTUALSCREEN),
    Cs.y = UserGetSystemMetrics(SM_YVIRTUALSCREEN),
    Cs.cx = UserGetSystemMetrics(SM_CXVIRTUALSCREEN),
    Cs.cy = UserGetSystemMetrics(SM_CYVIRTUALSCREEN),
    Cs.style = WS_POPUP|WS_CLIPCHILDREN;
    Cs.hInstance = hModClient; // hModuleWin; // Server side winproc!
    Cs.lpszName = (LPCWSTR) &WindowName;
    Cs.lpszClass = (LPCWSTR) &ClassName;

    /* Use IntCreateWindow instead of co_UserCreateWindowEx because the later expects a thread with a desktop */
    pWnd = IntCreateWindow(&Cs, &WindowName, pcls, NULL, NULL, NULL, pdesk, WINVER);
    if (pWnd == NULL)
    {
        ERR("Failed to create desktop window for the new desktop\n");
        Status = STATUS_UNSUCCESSFUL;
        goto Quit;
    }

    pdesk->dwSessionId = PsGetCurrentProcessSessionId();
    pdesk->DesktopWindow = pWnd->head.h;
    pdesk->pDeskInfo->spwnd = pWnd;
    pWnd->fnid = FNID_DESKTOP;

    ClassName.Buffer = MAKEINTATOM(gpsi->atomSysClass[ICLS_HWNDMESSAGE]);
    ClassName.Length = 0;
    pcls = IntGetAndReferenceClass(&ClassName, 0, TRUE);
    if (pcls == NULL)
    {
        ASSERT(FALSE);
        Status = STATUS_UNSUCCESSFUL;
        goto Quit;
    }

    RtlZeroMemory(&WindowName, sizeof(WindowName));
    RtlZeroMemory(&Cs, sizeof(Cs));
    Cs.cx = Cs.cy = 100;
    Cs.style = WS_POPUP|WS_CLIPCHILDREN;
    Cs.hInstance = hModClient; // hModuleWin; // Server side winproc!
    Cs.lpszName = (LPCWSTR)&WindowName;
    Cs.lpszClass = (LPCWSTR)&ClassName;
    pWnd = IntCreateWindow(&Cs, &WindowName, pcls, NULL, NULL, NULL, pdesk, WINVER);
    if (pWnd == NULL)
    {
        ERR("Failed to create message window for the new desktop\n");
        Status = STATUS_UNSUCCESSFUL;
        goto Quit;
    }

    pdesk->spwndMessage = pWnd;
    pWnd->fnid = FNID_MESSAGEWND;

    /* Now,,,
       if !(WinStaObject->Flags & WSF_NOIO) is (not set) for desktop input output mode (see wiki)
       Create Tooltip. Saved in DesktopObject->spwndTooltip.
       Tooltip dwExStyle: WS_EX_TOOLWINDOW|WS_EX_TOPMOST
       hWndParent are spwndMessage. Use hModuleWin for server side winproc!
       The rest is same as message window.
       http://msdn.microsoft.com/en-us/library/bb760250(VS.85).aspx
    */
    Status = STATUS_SUCCESS;

Quit:
    if (pdesk != NULL)
    {
        ObDereferenceObject(pdesk);
    }
    if (!NT_SUCCESS(Status) && hDesk != NULL)
    {
        ObCloseHandle(hDesk, AccessMode);
        hDesk = NULL;
    }
    if (!NoHooks)
    {
        ptiCurrent->TIF_flags &= ~TIF_DISABLEHOOKS;
        ptiCurrent->pClientInfo->dwTIFlags = ptiCurrent->TIF_flags;
    }

    TRACE("Leave IntCreateDesktop, Status 0x%08lx\n", Status);

    if (NT_SUCCESS(Status))
        *phDesktop = hDesk;
    else
        SetLastNtError(Status);
    return Status;
}

Referenced by IntResolveDesktop(), and NtUserCreateDesktop().

IntDeRegisterShellHookWindow()

BOOL IntDeRegisterShellHookWindow

(

HWND

hWnd

)

Definition at line 1748 of file desktop.c.

{
    PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
    PDESKTOP Desktop = pti->rpdesk;
    PLIST_ENTRY ListEntry;
    PSHELL_HOOK_WINDOW Current;

    ListEntry = Desktop->ShellHookWindows.Flink;
    while (ListEntry != &Desktop->ShellHookWindows)
    {
        Current = CONTAINING_RECORD(ListEntry, SHELL_HOOK_WINDOW, ListEntry);
        ListEntry = ListEntry->Flink;
        if (Current->hWnd == hWnd)
        {
            RemoveEntryList(&Current->ListEntry);
            ExFreePoolWithTag(Current, TAG_WINSTA);
            return TRUE;
        }
    }

    return FALSE;
}

Referenced by co_UserFreeWindow(), IntRegisterShellHookWindow(), and NtUserCallHwnd().

IntDesktopObjectClose()

NTSTATUS NTAPI IntDesktopObjectClose

(

_In_ PVOID

Parameters

)

Definition at line 215 of file desktop.c.

{
    PWIN32_CLOSEMETHOD_PARAMETERS CloseParameters = Parameters;
    PPROCESSINFO ppi = PsGetProcessWin32Process(CloseParameters->Process);
    if (ppi == NULL)
    {
        /* This happens when the process leaks desktop handles.
         * At this point the PPROCESSINFO is already destroyed */
        return STATUS_SUCCESS;
    }

    return IntUnmapDesktopView((PDESKTOP)CloseParameters->Object);
}

Referenced by DriverEntry().

IntDesktopObjectDelete()

NTSTATUS NTAPI IntDesktopObjectDelete

(

_In_ PVOID

Parameters

)

Definition at line 147 of file desktop.c.

{
    PWIN32_DELETEMETHOD_PARAMETERS DeleteParameters = Parameters;
    PDESKTOP pdesk = (PDESKTOP)DeleteParameters->Object;

    TRACE("Deleting desktop object 0x%p\n", pdesk);

    if (pdesk->pDeskInfo &&
        pdesk->pDeskInfo->spwnd)
    {
        ASSERT(pdesk->pDeskInfo->spwnd->spwndChild == NULL);
        co_UserDestroyWindow(pdesk->pDeskInfo->spwnd);
    }

    if (pdesk->spwndMessage)
        co_UserDestroyWindow(pdesk->spwndMessage);

    /* Remove the desktop from the window station's list of associcated desktops */
    RemoveEntryList(&pdesk->ListEntry);

    /* Free the heap */
    IntFreeDesktopHeap(pdesk);

    ObDereferenceObject(pdesk->rpwinstaParent);

    return STATUS_SUCCESS;
}

Referenced by DriverEntry().

IntDesktopObjectOpen()

NTSTATUS NTAPI IntDesktopObjectOpen

(

_In_ PVOID

Parameters

)

Definition at line 202 of file desktop.c.

{
    PWIN32_OPENMETHOD_PARAMETERS OpenParameters = Parameters;
    PPROCESSINFO ppi = PsGetProcessWin32Process(OpenParameters->Process);
    if (ppi == NULL)
        return STATUS_SUCCESS;

    return IntMapDesktopView((PDESKTOP)OpenParameters->Object);
}

Referenced by DriverEntry().

IntDesktopObjectParse()

NTSTATUS APIENTRY IntDesktopObjectParse	(	IN PVOID	ParseObject,
		IN PVOID	ObjectType,
		IN OUT PACCESS_STATE	AccessState,
		IN KPROCESSOR_MODE	AccessMode,
		IN ULONG	Attributes,
		IN OUT PUNICODE_STRING	CompleteName,
		IN OUT PUNICODE_STRING	RemainingName,
		IN OUT PVOID Context	OPTIONAL,
		IN PSECURITY_QUALITY_OF_SERVICE SecurityQos	OPTIONAL,
		OUT PVOID *	Object
	)

Definition at line 45 of file desktop.c.

{
    NTSTATUS Status;
    PDESKTOP Desktop;
    OBJECT_ATTRIBUTES ObjectAttributes;
    PLIST_ENTRY NextEntry, ListHead;
    PWINSTATION_OBJECT WinStaObject = (PWINSTATION_OBJECT)ParseObject;
    UNICODE_STRING DesktopName;
    PBOOLEAN pContext = (PBOOLEAN) Context;

    if (pContext)
        *pContext = FALSE;

    /* Set the list pointers and loop the window station */
    ListHead = &WinStaObject->DesktopListHead;
    NextEntry = ListHead->Flink;
    while (NextEntry != ListHead)
    {
        /* Get the current desktop */
        Desktop = CONTAINING_RECORD(NextEntry, DESKTOP, ListEntry);

        /* Get the desktop name */
        ASSERT(Desktop->pDeskInfo != NULL);
        RtlInitUnicodeString(&DesktopName, Desktop->pDeskInfo->szDesktopName);

        /* Compare the name */
        if (RtlEqualUnicodeString(RemainingName,
                                  &DesktopName,
                                  (Attributes & OBJ_CASE_INSENSITIVE) != 0))
        {
            /* We found a match. Did this come from a create? */
            if (Context)
            {
                /* Unless OPEN_IF was given, fail with an error */
                if (!(Attributes & OBJ_OPENIF))
                {
                    /* Name collision */
                    return STATUS_OBJECT_NAME_COLLISION;
                }
                else
                {
                    /* Otherwise, return with a warning only */
                    Status = STATUS_OBJECT_NAME_EXISTS;
                }
            }
            else
            {
                /* This was a real open, so this is OK */
                Status = STATUS_SUCCESS;
            }

            /* Reference the desktop and return it */
            ObReferenceObject(Desktop);
            *Object = Desktop;
            return Status;
        }

        /* Go to the next desktop */
        NextEntry = NextEntry->Flink;
    }

    /* If we got here but this isn't a create, just fail */
    if (!Context) return STATUS_OBJECT_NAME_NOT_FOUND;

    /* Create the desktop object */
    InitializeObjectAttributes(&ObjectAttributes, RemainingName, 0, NULL, NULL);
    Status = ObCreateObject(KernelMode,
                            ExDesktopObjectType,
                            &ObjectAttributes,
                            KernelMode,
                            NULL,
                            sizeof(DESKTOP),
                            0,
                            0,
                            (PVOID*)&Desktop);
    if (!NT_SUCCESS(Status)) return Status;

    /* Initialize the desktop */
    Status = UserInitializeDesktop(Desktop, RemainingName, WinStaObject);
    if (!NT_SUCCESS(Status))
    {
        ObDereferenceObject(Desktop);
        return Status;
    }

    /* Set the desktop object and return success */
    *Object = Desktop;
    *pContext = TRUE;
    return STATUS_SUCCESS;
}

Referenced by IntWinStaObjectParse().

IntDesktopOkToClose()

NTSTATUS NTAPI IntDesktopOkToClose

(

_In_ PVOID

Parameters

)

Definition at line 178 of file desktop.c.

{
    PWIN32_OKAYTOCLOSEMETHOD_PARAMETERS OkToCloseParameters = Parameters;
    PTHREADINFO pti = PsGetCurrentThreadWin32Thread();

    if (pti == NULL)
    {
        /* This happens when we leak desktop handles */
        return STATUS_SUCCESS;
    }

    /* Do not allow the current desktop or the initial desktop to be closed */
    if (OkToCloseParameters->Handle == pti->ppi->hdeskStartup ||
        OkToCloseParameters->Handle == pti->hdesk)
    {
        return STATUS_ACCESS_DENIED;
    }

    return STATUS_SUCCESS;
}

Referenced by DriverEntry().

IntFreeDesktopHeap() [1/2]

static VOID IntFreeDesktopHeap ( IN PDESKTOP  pdesk )

static

Referenced by IntDesktopObjectDelete().

IntFreeDesktopHeap() [2/2]

static VOID IntFreeDesktopHeap ( IN OUT PDESKTOP  Desktop )

static

Definition at line 1772 of file desktop.c.

{
    /* FIXME: Disable until unmapping works in mm */
#if 0
    if (Desktop->pheapDesktop != NULL)
    {
        MmUnmapViewInSessionSpace(Desktop->pheapDesktop);
        Desktop->pheapDesktop = NULL;
    }

    if (Desktop->hsectionDesktop != NULL)
    {
        ObDereferenceObject(Desktop->hsectionDesktop);
        Desktop->hsectionDesktop = NULL;
    }
#endif
}

IntGetActiveDesktop()

PDESKTOP FASTCALL IntGetActiveDesktop

(

VOID

)

Definition at line 1226 of file desktop.c.

{
    return gpdeskInputDesktop;
}

Referenced by co_HOOK_CallHooks(), co_IntInitializeDesktopGraphics(), co_IntShellHookNotify(), IntEndDesktopGraphics(), IntGetDesktopWindow(), IntGetFocusMessageQueue(), IntGetMessageWindow(), IntRemoveHook(), IntSetFocusMessageQueue(), NtUserBuildHwndList(), NtUserCallOneParam(), NtUserLockWorkStation(), UserGetDesktopWindow(), and UserGetMessageWindow().

IntGetCurrentThreadDesktopWindow()

HWND FASTCALL IntGetCurrentThreadDesktopWindow

(

VOID

)

Definition at line 1386 of file desktop.c.

{
    PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
    PDESKTOP pdo = pti->rpdesk;
    if (NULL == pdo)
    {
        ERR("Thread doesn't have a desktop\n");
        return NULL;
    }
    return pdo->DesktopWindow;
}

Referenced by NtUserFindWindowEx().

IntGetDesktopObjectHandle()

HDESK FASTCALL IntGetDesktopObjectHandle

(

PDESKTOP

DesktopObject

)

Definition at line 1235 of file desktop.c.

{
    NTSTATUS Status;
    HDESK hDesk;

    ASSERT(DesktopObject);

    if (!ObFindHandleForObject(PsGetCurrentProcess(),
                               DesktopObject,
                               ExDesktopObjectType,
                               NULL,
                               (PHANDLE)&hDesk))
    {
        Status = ObOpenObjectByPointer(DesktopObject,
                                       0,
                                       NULL,
                                       0,
                                       ExDesktopObjectType,
                                       UserMode,
                                       (PHANDLE)&hDesk);
        if (!NT_SUCCESS(Status))
        {
            /* Unable to create a handle */
            ERR("Unable to create a desktop handle\n");
            return NULL;
        }
    }
    else
    {
        TRACE("Got handle: 0x%p\n", hDesk);
    }

    return hDesk;
}

Referenced by NtUserGetThreadDesktop(), and NtUserSetInformationThread().

IntGetDesktopWindow()

HWND FASTCALL IntGetDesktopWindow

(

VOID

)

Definition at line 1338 of file desktop.c.

{
    PDESKTOP pdo = IntGetActiveDesktop();
    if (!pdo)
    {
        TRACE("No active desktop\n");
        return NULL;
    }
    return pdo->DesktopWindow;
}

Referenced by co_IntProcessKeyboardMessage(), co_IntSetWindowLongPtr(), co_UserSetParent(), co_WinPosSetWindowPos(), DceUpdateVisRgn(), IntPaintDesktop(), NtUserAlterWindowStyle(), NtUserRedrawWindow(), NtUserSetParent(), NtUserSetWindowLong(), NtUserSetWindowWord(), NtUserWindowFromPoint(), SnapWindow(), UserGetAncestor(), UserRealizePalette(), and UserRegisterUserApiHook().

IntGetFocusMessageQueue()

PUSER_MESSAGE_QUEUE FASTCALL IntGetFocusMessageQueue

(

VOID

)

Definition at line 1271 of file desktop.c.

{
    PDESKTOP pdo = IntGetActiveDesktop();
    if (!pdo)
    {
        TRACE("No active desktop\n");
        return(NULL);
    }
    return (PUSER_MESSAGE_QUEUE)pdo->ActiveMessageQueue;
}

Referenced by co_IntSetForegroundAndFocusWindow(), co_UserSetFocus(), co_WinPosShowWindow(), DoTheScreenSaver(), IntGetCaptureWindow(), IntSendDestroyMsg(), NtUserGetGUIThreadInfo(), ProcessKeyEvent(), UserGetForegroundWindow(), UserProcessKeyboardInput(), and UserSendKeyboardInput().

IntGetMessageWindow()

HWND FASTCALL IntGetMessageWindow

(

VOID

)

Definition at line 1362 of file desktop.c.

{
    PDESKTOP pdo = IntGetActiveDesktop();

    if (!pdo)
    {
        TRACE("No active desktop\n");
        return NULL;
    }
    return pdo->spwndMessage->head.h;
}

Referenced by NtUserFindWindowEx(), and NtUserSetParent().

IntGetThreadDesktopWindow()

PWND FASTCALL IntGetThreadDesktopWindow

(

PTHREADINFO

pti

)

Definition at line 1323 of file desktop.c.

{
    if (!pti) pti = PsGetCurrentThreadWin32Thread();
    if (pti->pDeskInfo) return pti->pDeskInfo->spwnd;
    return NULL;
}

Referenced by ActivateOtherWindowMin().

IntHideDesktop()

NTSTATUS FASTCALL IntHideDesktop

(

PDESKTOP

Desktop

)

Definition at line 1599 of file desktop.c.

{
    PWND DesktopWnd;

    DesktopWnd = IntGetWindowObject(Desktop->DesktopWindow);
    if (! DesktopWnd)
    {
        return ERROR_INVALID_WINDOW_HANDLE;
    }
    DesktopWnd->style &= ~WS_VISIBLE;

    return STATUS_SUCCESS;
}

Referenced by IntEndDesktopGraphics(), and NtUserSwitchDesktop().

IntMapDesktopView()

static NTSTATUS IntMapDesktopView ( IN PDESKTOP  pdesk )

static

Definition at line 3137 of file desktop.c.

{
    PPROCESSINFO ppi;
    PW32HEAP_USER_MAPPING HeapMapping, *PrevLink;
    PVOID UserBase = NULL;
    SIZE_T ViewSize = 0;
    LARGE_INTEGER Offset;
    NTSTATUS Status;

    TRACE("IntMapDesktopView called for desktop object 0x%p\n", pdesk);

    ppi = PsGetCurrentProcessWin32Process();

    /*
     * Find out if another thread already mapped the desktop heap.
     * Start the search at the next mapping: skip the first entry
     * as it must be the global user heap mapping.
     */
    PrevLink = &ppi->HeapMappings.Next;
    HeapMapping = *PrevLink;
    while (HeapMapping != NULL)
    {
        if (HeapMapping->KernelMapping == (PVOID)pdesk->pheapDesktop)
        {
            HeapMapping->Count++;
            return STATUS_SUCCESS;
        }

        PrevLink = &HeapMapping->Next;
        HeapMapping = HeapMapping->Next;
    }

    /* We're the first, map the heap */
    Offset.QuadPart = 0;
    Status = MmMapViewOfSection(pdesk->hsectionDesktop,
                                PsGetCurrentProcess(),
                                &UserBase,
                                0,
                                0,
                                &Offset,
                                &ViewSize,
                                ViewUnmap,
                                SEC_NO_CHANGE,
                                PAGE_EXECUTE_READ); /* Would prefer PAGE_READONLY, but thanks to RTL heaps... */
    if (!NT_SUCCESS(Status))
    {
        ERR("Failed to map desktop\n");
        return Status;
    }

    TRACE("ppi 0x%p mapped heap of desktop 0x%p\n", ppi, pdesk);

    /* Add the mapping */
    HeapMapping = UserHeapAlloc(sizeof(*HeapMapping));
    if (HeapMapping == NULL)
    {
        MmUnmapViewOfSection(PsGetCurrentProcess(), UserBase);
        ERR("UserHeapAlloc() failed!\n");
        return STATUS_NO_MEMORY;
    }

    HeapMapping->Next = NULL;
    HeapMapping->KernelMapping = (PVOID)pdesk->pheapDesktop;
    HeapMapping->UserMapping = UserBase;
    HeapMapping->Limit = ViewSize;
    HeapMapping->Count = 1;
    *PrevLink = HeapMapping;

    ObReferenceObject(pdesk);

    return STATUS_SUCCESS;
}

Referenced by IntDesktopObjectOpen(), and IntSetThreadDesktop().

IntPaintDesktop()

BOOL FASTCALL IntPaintDesktop

(

HDC

hDC

)

Definition at line 1791 of file desktop.c.

{
    static WCHAR s_wszSafeMode[] = L"Safe Mode"; // FIXME: Localize!

    RECTL Rect;
    HBRUSH DesktopBrush, PreviousBrush;
    HWND hWndDesktop;
    BOOL doPatBlt = TRUE;
    PWND WndDesktop;
    BOOLEAN InSafeMode;

    if (GdiGetClipBox(hDC, &Rect) == ERROR)
        return FALSE;

    hWndDesktop = IntGetDesktopWindow(); // rpdesk->DesktopWindow;

    WndDesktop = UserGetWindowObject(hWndDesktop); // rpdesk->pDeskInfo->spwnd;
    if (!WndDesktop)
        return FALSE;

    /* Retrieve the current SafeMode state */
    InSafeMode = (UserGetSystemMetrics(SM_CLEANBOOT) != 0); // gpsi->aiSysMet[SM_CLEANBOOT];

    if (!InSafeMode)
    {
        DesktopBrush = (HBRUSH)WndDesktop->pcls->hbrBackground;

        /*
         * Paint desktop background
         */
        if (gspv.hbmWallpaper != NULL)
        {
            SIZE sz;
            int x, y;
            int scaledWidth, scaledHeight;
            int wallpaperX, wallpaperY, wallpaperWidth, wallpaperHeight;
            HDC hWallpaperDC;

            sz.cx = WndDesktop->rcWindow.right - WndDesktop->rcWindow.left;
            sz.cy = WndDesktop->rcWindow.bottom - WndDesktop->rcWindow.top;

            if (gspv.WallpaperMode == wmFit ||
                gspv.WallpaperMode == wmFill)
            {
                int scaleNum, scaleDen;

                // Precision improvement over ((sz.cx / gspv.cxWallpaper) > (sz.cy / gspv.cyWallpaper))
                if ((sz.cx * gspv.cyWallpaper) > (sz.cy * gspv.cxWallpaper))
                {
                    if (gspv.WallpaperMode == wmFit)
                    {
                        scaleNum = sz.cy;
                        scaleDen = gspv.cyWallpaper;
                    }
                    else
                    {
                        scaleNum = sz.cx;
                        scaleDen = gspv.cxWallpaper;
                    }
                }
                else
                {
                    if (gspv.WallpaperMode == wmFit)
                    {
                        scaleNum = sz.cx;
                        scaleDen = gspv.cxWallpaper;
                    }
                    else
                    {
                        scaleNum = sz.cy;
                        scaleDen = gspv.cyWallpaper;
                    }
                }

                scaledWidth = EngMulDiv(gspv.cxWallpaper, scaleNum, scaleDen);
                scaledHeight = EngMulDiv(gspv.cyWallpaper, scaleNum, scaleDen);

                if (gspv.WallpaperMode == wmFill)
                {
                    wallpaperX = (((scaledWidth - sz.cx) * gspv.cxWallpaper) / (2 * scaledWidth));
                    wallpaperY = (((scaledHeight - sz.cy) * gspv.cyWallpaper) / (2 * scaledHeight));

                    wallpaperWidth = (sz.cx * gspv.cxWallpaper) / scaledWidth;
                    wallpaperHeight = (sz.cy * gspv.cyWallpaper) / scaledHeight;
                }
            }

            if (gspv.WallpaperMode == wmStretch ||
                gspv.WallpaperMode == wmTile ||
                gspv.WallpaperMode == wmFill)
            {
                x = 0;
                y = 0;
            }
            else if (gspv.WallpaperMode == wmFit)
            {
                x = (sz.cx - scaledWidth) / 2;
                y = (sz.cy - scaledHeight) / 2;
            }
            else
            {
                /* Find the upper left corner, can be negative if the bitmap is bigger than the screen */
                x = (sz.cx / 2) - (gspv.cxWallpaper / 2);
                y = (sz.cy / 2) - (gspv.cyWallpaper / 2);
            }

            hWallpaperDC = NtGdiCreateCompatibleDC(hDC);
            if (hWallpaperDC != NULL)
            {
                HBITMAP hOldBitmap;

                /* Fill in the area that the bitmap is not going to cover */
                if (x > 0 || y > 0)
                {
                    /* FIXME: Clip out the bitmap
                       can be replaced with "NtGdiPatBlt(hDC, x, y, gspv.cxWallpaper, gspv.cyWallpaper, PATCOPY | DSTINVERT);"
                       once we support DSTINVERT */
                    PreviousBrush = NtGdiSelectBrush(hDC, DesktopBrush);
                    NtGdiPatBlt(hDC, Rect.left, Rect.top, Rect.right, Rect.bottom, PATCOPY);
                    NtGdiSelectBrush(hDC, PreviousBrush);
                }

                /* Do not fill the background after it is painted no matter the size of the picture */
                doPatBlt = FALSE;

                hOldBitmap = NtGdiSelectBitmap(hWallpaperDC, gspv.hbmWallpaper);

                if (gspv.WallpaperMode == wmStretch)
                {
                    if (Rect.right && Rect.bottom)
                        NtGdiStretchBlt(hDC,
                                        x,
                                        y,
                                        sz.cx,
                                        sz.cy,
                                        hWallpaperDC,
                                        0,
                                        0,
                                        gspv.cxWallpaper,
                                        gspv.cyWallpaper,
                                        SRCCOPY,
                                        0);
                }
                else if (gspv.WallpaperMode == wmTile)
                {
                    /* Paint the bitmap across the screen then down */
                    for (y = 0; y < Rect.bottom; y += gspv.cyWallpaper)
                    {
                        for (x = 0; x < Rect.right; x += gspv.cxWallpaper)
                        {
                            NtGdiBitBlt(hDC,
                                        x,
                                        y,
                                        gspv.cxWallpaper,
                                        gspv.cyWallpaper,
                                        hWallpaperDC,
                                        0,
                                        0,
                                        SRCCOPY,
                                        0,
                                        0);
                        }
                    }
                }
                else if (gspv.WallpaperMode == wmFit)
                {
                    if (Rect.right && Rect.bottom)
                    {
                        NtGdiStretchBlt(hDC,
                                        x,
                                        y,
                                        scaledWidth,
                                        scaledHeight,
                                        hWallpaperDC,
                                        0,
                                        0,
                                        gspv.cxWallpaper,
                                        gspv.cyWallpaper,
                                        SRCCOPY,
                                        0);
                    }
                }
                else if (gspv.WallpaperMode == wmFill)
                {
                    if (Rect.right && Rect.bottom)
                    {
                        NtGdiStretchBlt(hDC,
                                        x,
                                        y,
                                        sz.cx,
                                        sz.cy,
                                        hWallpaperDC,
                                        wallpaperX,
                                        wallpaperY,
                                        wallpaperWidth,
                                        wallpaperHeight,
                                        SRCCOPY,
                                        0);
                    }
                }
                else
                {
                    NtGdiBitBlt(hDC,
                                x,
                                y,
                                gspv.cxWallpaper,
                                gspv.cyWallpaper,
                                hWallpaperDC,
                                0,
                                0,
                                SRCCOPY,
                                0,
                                0);
                }
                NtGdiSelectBitmap(hWallpaperDC, hOldBitmap);
                NtGdiDeleteObjectApp(hWallpaperDC);
            }
        }
    }
    else
    {
        /* Black desktop background in Safe Mode */
        DesktopBrush = StockObjects[BLACK_BRUSH];
    }

    /* Background is set to none, clear the screen */
    if (doPatBlt)
    {
        PreviousBrush = NtGdiSelectBrush(hDC, DesktopBrush);
        NtGdiPatBlt(hDC, Rect.left, Rect.top, Rect.right, Rect.bottom, PATCOPY);
        NtGdiSelectBrush(hDC, PreviousBrush);
    }

    /*
     * Display the system version on the desktop background
     */
    if (InSafeMode || g_AlwaysDisplayVersion || g_PaintDesktopVersion)
    {
        NTSTATUS Status;
        static WCHAR wszzVersion[1024] = L"\0";

        /* Only used in normal mode */
        // We expect at most 4 strings (3 for version, 1 for optional NtSystemRoot)
        static POLYTEXTW VerStrs[4] = {{0},{0},{0},{0}};
        INT i = 0;
        SIZE_T len;

        HFONT hFont1 = NULL, hFont2 = NULL, hOldFont = NULL;
        COLORREF crText, color_old;
        UINT align_old;
        INT mode_old;
        PDC pdc;

        if (!UserSystemParametersInfo(SPI_GETWORKAREA, 0, &Rect, 0))
        {
            Rect.left = Rect.top = 0;
            Rect.right  = UserGetSystemMetrics(SM_CXSCREEN);
            Rect.bottom = UserGetSystemMetrics(SM_CYSCREEN);
        }
        else
        {
            RECTL_vOffsetRect(&Rect, -Rect.left, -Rect.top);
        }

        /*
         * Set up the fonts (otherwise use default ones)
         */

        /* Font for the principal version string */
        hFont1 = GreCreateFontIndirectW(&gspv.ncm.lfCaptionFont);
        /* Font for the secondary version strings */
        hFont2 = GreCreateFontIndirectW(&gspv.ncm.lfMenuFont);

        if (hFont1)
            hOldFont = NtGdiSelectFont(hDC, hFont1);

        if (gspv.hbmWallpaper == NULL)
        {
            /* Retrieve the brush fill colour */
            // TODO: The following code constitutes "GreGetBrushColor".
            PreviousBrush = NtGdiSelectBrush(hDC, DesktopBrush);
            pdc = DC_LockDc(hDC);
            if (pdc)
            {
                crText = pdc->eboFill.ulRGBColor;
                DC_UnlockDc(pdc);
            }
            else
            {
                crText = RGB(0, 0, 0);
            }
            NtGdiSelectBrush(hDC, PreviousBrush);

            /* Adjust text colour according to the brush */
            if (GetRValue(crText) + GetGValue(crText) + GetBValue(crText) > 128 * 3)
                crText = RGB(0, 0, 0);
            else
                crText = RGB(255, 255, 255);
        }
        else
        {
            /* Always use white when the text is displayed on top of a wallpaper */
            crText = RGB(255, 255, 255);
        }

        color_old = IntGdiSetTextColor(hDC, crText);
        align_old = IntGdiSetTextAlign(hDC, TA_RIGHT);
        mode_old  = IntGdiSetBkMode(hDC, TRANSPARENT);

        /* Display the system version information */
        if (!*wszzVersion)
        {
            Status = GetSystemVersionString(wszzVersion,
                                            ARRAYSIZE(wszzVersion),
                                            InSafeMode,
                                            g_AlwaysDisplayVersion);
            if (!InSafeMode && NT_SUCCESS(Status) && *wszzVersion)
            {
                PWCHAR pstr = wszzVersion;
                for (i = 0; (i < ARRAYSIZE(VerStrs)) && *pstr; ++i)
                {
                    VerStrs[i].n = lstrlenW(pstr);
                    VerStrs[i].lpstr = pstr;
                    pstr += (VerStrs[i].n + 1);
                }
            }
        }
        else
        {
            Status = STATUS_SUCCESS;
        }
        if (NT_SUCCESS(Status) && *wszzVersion)
        {
            if (!InSafeMode)
            {
                SIZE Size = {0, 0};
                LONG TotalHeight = 0;

                /* Normal Mode: multiple version information text separated by newlines */
                IntGdiSetTextAlign(hDC, TA_RIGHT | TA_BOTTOM);

                /* Compute the heights of the strings */
                if (hFont1) NtGdiSelectFont(hDC, hFont1);
                for (i = 0; i < ARRAYSIZE(VerStrs); ++i)
                {
                    if (!VerStrs[i].lpstr || !*VerStrs[i].lpstr || (VerStrs[i].n == 0))
                        break;

                    GreGetTextExtentW(hDC, VerStrs[i].lpstr, VerStrs[i].n, &Size, 1);
                    VerStrs[i].y = Size.cy; // Store the string height
                    TotalHeight += Size.cy;

                    /* While the first string was using hFont1, all the others use hFont2 */
                    if (hFont2) NtGdiSelectFont(hDC, hFont2);
                }
                /* The total height must not exceed the screen height */
                TotalHeight = min(TotalHeight, Rect.bottom);

                /* Display the strings */
                if (hFont1) NtGdiSelectFont(hDC, hFont1);
                for (i = 0; i < ARRAYSIZE(VerStrs); ++i)
                {
                    if (!VerStrs[i].lpstr || !*VerStrs[i].lpstr || (VerStrs[i].n == 0))
                        break;

                    TotalHeight -= VerStrs[i].y;
                    GreExtTextOutW(hDC,
                                   Rect.right - 5,
                                   Rect.bottom - TotalHeight - 5,
                                   0, NULL,
                                   VerStrs[i].lpstr,
                                   VerStrs[i].n,
                                   NULL, 0);

                    /* While the first string was using hFont1, all the others use hFont2 */
                    if (hFont2) NtGdiSelectFont(hDC, hFont2);
                }
            }
            else
            {
                if (hFont1) NtGdiSelectFont(hDC, hFont1);

                /* Safe Mode: single version information text in top center */
                len = wcslen(wszzVersion);

                IntGdiSetTextAlign(hDC, TA_CENTER | TA_TOP);
                GreExtTextOutW(hDC, (Rect.right + Rect.left)/2, Rect.top + 3, 0, NULL, wszzVersion, len, NULL, 0);
            }
        }

        if (InSafeMode)
        {
            if (hFont1) NtGdiSelectFont(hDC, hFont1);

            /* Print Safe Mode text in corners */
            len = wcslen(s_wszSafeMode);

            IntGdiSetTextAlign(hDC, TA_LEFT | TA_TOP);
            GreExtTextOutW(hDC, Rect.left, Rect.top + 3, 0, NULL, s_wszSafeMode, len, NULL, 0);
            IntGdiSetTextAlign(hDC, TA_RIGHT | TA_TOP);
            GreExtTextOutW(hDC, Rect.right, Rect.top + 3, 0, NULL, s_wszSafeMode, len, NULL, 0);
            IntGdiSetTextAlign(hDC, TA_LEFT | TA_BOTTOM);
            GreExtTextOutW(hDC, Rect.left, Rect.bottom - 5, 0, NULL, s_wszSafeMode, len, NULL, 0);
            IntGdiSetTextAlign(hDC, TA_RIGHT | TA_BOTTOM);
            GreExtTextOutW(hDC, Rect.right, Rect.bottom - 5, 0, NULL, s_wszSafeMode, len, NULL, 0);
        }

        IntGdiSetBkMode(hDC, mode_old);
        IntGdiSetTextAlign(hDC, align_old);
        IntGdiSetTextColor(hDC, color_old);

        if (hFont2)
            GreDeleteObject(hFont2);

        if (hFont1)
        {
            NtGdiSelectFont(hDC, hOldFont);
            GreDeleteObject(hFont1);
        }
    }

    return TRUE;
}

Referenced by DesktopWindowProc(), NtUserPaintDesktop(), and UserRealizePalette().

IntRegisterShellHookWindow()

BOOL IntRegisterShellHookWindow

(

HWND

hWnd

)

Definition at line 1716 of file desktop.c.

{
    PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
    PDESKTOP Desktop = pti->rpdesk;
    PSHELL_HOOK_WINDOW Entry;

    TRACE("IntRegisterShellHookWindow\n");

    /* First deregister the window, so we can be sure it's never twice in the
     * list.
     */
    IntDeRegisterShellHookWindow(hWnd);

    Entry = ExAllocatePoolWithTag(PagedPool,
                                  sizeof(SHELL_HOOK_WINDOW),
                                  TAG_WINSTA);

    if (!Entry)
        return FALSE;

    Entry->hWnd = hWnd;

    InsertTailList(&Desktop->ShellHookWindows, &Entry->ListEntry);

    return TRUE;
}

Referenced by NtUserCallHwnd().

IntResolveDesktop()

NTSTATUS FASTCALL IntResolveDesktop	(	IN PEPROCESS	Process,
		IN PUNICODE_STRING	DesktopPath,
		IN BOOL	bInherit,
		OUT HWINSTA *	phWinSta,
		OUT HDESK *	phDesktop
	)

Definition at line 535 of file desktop.c.

{
    NTSTATUS Status;
    HWINSTA hWinSta = NULL, hWinStaDup = NULL;
    HDESK hDesktop = NULL, hDesktopDup = NULL;
    PPROCESSINFO ppi;
    HANDLE hProcess = NULL;
    LUID ProcessLuid;
    USHORT StrSize;
    SIZE_T MemSize;
    POBJECT_ATTRIBUTES ObjectAttributes = NULL;
    PUNICODE_STRING ObjectName;
    UNICODE_STRING WinStaName, DesktopName;
    const UNICODE_STRING WinSta0Name = RTL_CONSTANT_STRING(L"WinSta0");
    PWINSTATION_OBJECT WinStaObject;
    HWINSTA hTempWinSta = NULL;
    BOOLEAN bUseDefaultWinSta = FALSE;
    BOOLEAN bInteractive = FALSE;
    BOOLEAN bAccessAllowed = FALSE;

    ASSERT(phWinSta);
    ASSERT(phDesktop);
    ASSERT(DesktopPath);

    *phWinSta  = NULL;
    *phDesktop = NULL;

    ppi = PsGetProcessWin32Process(Process);
    /* ppi is typically NULL for console applications that connect to Win32 USER */
    if (!ppi) TRACE("IntResolveDesktop: ppi is NULL!\n");

    if (ppi && ppi->hwinsta != NULL && ppi->hdeskStartup != NULL)
    {
        /*
         * If this process is the current one, just return the cached handles.
         * Otherwise, open the window station and desktop objects.
         */
        if (Process == PsGetCurrentProcess())
        {
            hWinSta  = ppi->hwinsta;
            hDesktop = ppi->hdeskStartup;
        }
        else
        {
            Status = ObOpenObjectByPointer(ppi->prpwinsta,
                                           0,
                                           NULL,
                                           MAXIMUM_ALLOWED,
                                           ExWindowStationObjectType,
                                           UserMode,
                                           (PHANDLE)&hWinSta);
            if (!NT_SUCCESS(Status))
            {
                ERR("IntResolveDesktop: Could not reference window station 0x%p\n", ppi->prpwinsta);
                SetLastNtError(Status);
                return Status;
            }

            Status = ObOpenObjectByPointer(ppi->rpdeskStartup,
                                           0,
                                           NULL,
                                           MAXIMUM_ALLOWED,
                                           ExDesktopObjectType,
                                           UserMode,
                                           (PHANDLE)&hDesktop);
            if (!NT_SUCCESS(Status))
            {
                ERR("IntResolveDesktop: Could not reference desktop 0x%p\n", ppi->rpdeskStartup);
                ObCloseHandle(hWinSta, UserMode);
                SetLastNtError(Status);
                return Status;
            }
        }

        *phWinSta  = hWinSta;
        *phDesktop = hDesktop;
        return STATUS_SUCCESS;
    }

    /* We will by default use the default window station and desktop */
    RtlInitEmptyUnicodeString(&WinStaName, NULL, 0);
    RtlInitEmptyUnicodeString(&DesktopName, NULL, 0);

    /*
     * Parse the desktop path string which can be of the form "WinSta\Desktop"
     * or just "Desktop". In the latter case we use the default window station
     * on which the process is attached to (or if none, "WinSta0").
     */
    if (DesktopPath->Buffer != NULL && DesktopPath->Length > sizeof(WCHAR))
    {
        DesktopName = *DesktopPath;

        /* Find the separator */
        while (DesktopName.Length > 0 && *DesktopName.Buffer &&
               *DesktopName.Buffer != OBJ_NAME_PATH_SEPARATOR)
        {
            DesktopName.Buffer++;
            DesktopName.Length -= sizeof(WCHAR);
            DesktopName.MaximumLength -= sizeof(WCHAR);
        }
        if (DesktopName.Length > 0)
        {
            RtlInitEmptyUnicodeString(&WinStaName, DesktopPath->Buffer,
                                      DesktopPath->Length - DesktopName.Length);
            // (USHORT)((ULONG_PTR)DesktopName.Buffer - (ULONG_PTR)DesktopPath->Buffer);
            WinStaName.Length = WinStaName.MaximumLength;

            /* Skip the separator */
            DesktopName.Buffer++;
            DesktopName.Length -= sizeof(WCHAR);
            DesktopName.MaximumLength -= sizeof(WCHAR);
        }
        else
        {
            RtlInitEmptyUnicodeString(&WinStaName, NULL, 0);
            DesktopName = *DesktopPath;
        }
    }

    TRACE("IntResolveDesktop: WinStaName:'%wZ' ; DesktopName:'%wZ'\n", &WinStaName, &DesktopName);

    /* Retrieve the process LUID */
    Status = GetProcessLuid(NULL, Process, &ProcessLuid);
    if (!NT_SUCCESS(Status))
    {
        ERR("IntResolveDesktop: Failed to retrieve the process LUID, Status 0x%08lx\n", Status);
        SetLastNtError(Status);
        return Status;
    }

    /*
     * If this process is not the current one, obtain a temporary handle
     * to it so that we can perform handles duplication later.
     */
    if (Process != PsGetCurrentProcess())
    {
        Status = ObOpenObjectByPointer(Process,
                                       OBJ_KERNEL_HANDLE,
                                       NULL,
                                       0,
                                       *PsProcessType,
                                       KernelMode,
                                       &hProcess);
        if (!NT_SUCCESS(Status))
        {
            ERR("IntResolveDesktop: Failed to obtain a handle to process 0x%p, Status 0x%08lx\n", Process, Status);
            SetLastNtError(Status);
            return Status;
        }
        ASSERT(hProcess);
    }

    /*
     * If no window station has been specified, search the process handle table
     * for inherited window station handles, otherwise use a default one.
     */
    if (WinStaName.Buffer == NULL)
    {
        /*
         * We want to find a suitable default window station.
         * For applications that can be interactive, i.e. that have allowed
         * access to the single interactive window station on the system,
         * the default window station is 'WinSta0'.
         * For applications that cannot be interactive, i.e. that do not have
         * access to 'WinSta0' (e.g. non-interactive services), the default
         * window station is 'Service-0xXXXX-YYYY$' (created if needed).
         * Precedence will however be taken by any inherited window station
         * that possesses the required interactivity property.
         */
        bUseDefaultWinSta = TRUE;

        /*
         * Use the default 'WinSta0' window station. Whether we should
         * use 'Service-0xXXXX-YYYY$' instead will be determined later.
         */
        // RtlInitUnicodeString(&WinStaName, L"WinSta0");
        WinStaName = WinSta0Name;

        if (ObFindHandleForObject(Process,
                                  NULL,
                                  ExWindowStationObjectType,
                                  NULL,
                                  (PHANDLE)&hWinSta))
        {
            TRACE("IntResolveDesktop: Inherited window station is: 0x%p\n", hWinSta);
        }
    }

    /*
     * If no desktop has been specified, search the process handle table
     * for inherited desktop handles, otherwise use the Default desktop.
     * Note that the inherited desktop that we may use, may not belong
     * to the window station we will connect to.
     */
    if (DesktopName.Buffer == NULL)
    {
        /* Use a default desktop name */
        RtlInitUnicodeString(&DesktopName, L"Default");

        if (ObFindHandleForObject(Process,
                                  NULL,
                                  ExDesktopObjectType,
                                  NULL,
                                  (PHANDLE)&hDesktop))
        {
            TRACE("IntResolveDesktop: Inherited desktop is: 0x%p\n", hDesktop);
        }
    }


    /*
     * We are going to open either a window station or a desktop.
     * Even if this operation is done from kernel-mode, we should
     * "emulate" an opening from user-mode (i.e. using an ObjectAttributes
     * allocated in user-mode, with AccessMode == UserMode) for the
     * Object Manager to perform proper access validation to the
     * window station or desktop.
     */

    /*
     * Estimate the maximum size needed for the window station name
     * and desktop name to be given to ObjectAttributes->ObjectName.
     */
    StrSize = 0;

    /* Window station name */
    MemSize = _scwprintf(L"Service-0x%x-%x$", MAXULONG, MAXULONG) * sizeof(WCHAR);
    MemSize = gustrWindowStationsDir.Length + sizeof(OBJ_NAME_PATH_SEPARATOR)
              + max(WinStaName.Length, MemSize) + sizeof(UNICODE_NULL);
    if (MemSize > MAXUSHORT)
    {
        ERR("IntResolveDesktop: Window station name length is too long.\n");
        Status = STATUS_NAME_TOO_LONG;
        goto Quit;
    }
    StrSize = max(StrSize, (USHORT)MemSize);

    /* Desktop name */
    MemSize = max(DesktopName.Length + sizeof(UNICODE_NULL), sizeof(L"Default"));
    StrSize = max(StrSize, (USHORT)MemSize);

    /* Size for the OBJECT_ATTRIBUTES */
    MemSize = ALIGN_UP(sizeof(OBJECT_ATTRIBUTES), sizeof(PVOID));

    /* Add the string size */
    MemSize += ALIGN_UP(sizeof(UNICODE_STRING), sizeof(PVOID));
    MemSize += StrSize;

    /* Allocate the memory in user-mode */
    Status = ZwAllocateVirtualMemory(ZwCurrentProcess(),
                                     (PVOID*)&ObjectAttributes,
                                     0,
                                     &MemSize,
                                     MEM_COMMIT,
                                     PAGE_READWRITE);
    if (!NT_SUCCESS(Status))
    {
        ERR("ZwAllocateVirtualMemory() failed, Status 0x%08lx\n", Status);
        goto Quit;
    }

    ObjectName = (PUNICODE_STRING)((ULONG_PTR)ObjectAttributes +
                     ALIGN_UP(sizeof(OBJECT_ATTRIBUTES), sizeof(PVOID)));

    RtlInitEmptyUnicodeString(ObjectName,
                              (PWCHAR)((ULONG_PTR)ObjectName +
                                  ALIGN_UP(sizeof(UNICODE_STRING), sizeof(PVOID))),
                              StrSize);


    /* If we got an inherited window station handle, duplicate and use it */
    if (hWinSta)
    {
        ASSERT(bUseDefaultWinSta);

        /* Duplicate the handle if it belongs to another process than the current one */
        if (Process != PsGetCurrentProcess())
        {
            ASSERT(hProcess);
            Status = ZwDuplicateObject(hProcess,
                                       hWinSta,
                                       ZwCurrentProcess(),
                                       (PHANDLE)&hWinStaDup,
                                       0,
                                       0,
                                       DUPLICATE_SAME_ACCESS);
            if (!NT_SUCCESS(Status))
            {
                ERR("IntResolveDesktop: Failed to duplicate the window station handle, Status 0x%08lx\n", Status);
                /* We will use a default window station */
                hWinSta = NULL;
            }
            else
            {
                hWinSta = hWinStaDup;
            }
        }
    }

    /*
     * If we have an inherited window station, check whether
     * it is interactive and remember that for later.
     */
    if (hWinSta)
    {
        ASSERT(bUseDefaultWinSta);

        /* Reference the inherited window station */
        Status = ObReferenceObjectByHandle(hWinSta,
                                           0,
                                           ExWindowStationObjectType,
                                           KernelMode,
                                           (PVOID*)&WinStaObject,
                                           NULL);
        if (!NT_SUCCESS(Status))
        {
            ERR("Failed to reference the inherited window station, Status 0x%08lx\n", Status);
            /* We will use a default window station */
            if (hWinStaDup)
            {
                ASSERT(hWinSta == hWinStaDup);
                ObCloseHandle(hWinStaDup, UserMode);
                hWinStaDup = NULL;
            }
            hWinSta = NULL;
        }
        else
        {
            ERR("Process LUID is: 0x%x-%x, inherited window station LUID is: 0x%x-%x\n",
                ProcessLuid.HighPart, ProcessLuid.LowPart,
                WinStaObject->luidUser.HighPart, WinStaObject->luidUser.LowPart);

            /* Check whether this window station is interactive, and remember it for later */
            bInteractive = !(WinStaObject->Flags & WSS_NOIO);

            /* Dereference the window station */
            ObDereferenceObject(WinStaObject);
        }
    }

    /* Build a valid window station name */
    Status = RtlStringCbPrintfW(ObjectName->Buffer,
                                ObjectName->MaximumLength,
                                L"%wZ\\%wZ",
                                &gustrWindowStationsDir,
                                &WinStaName);
    if (!NT_SUCCESS(Status))
    {
        ERR("Impossible to build a valid window station name, Status 0x%08lx\n", Status);
        goto Quit;
    }
    ObjectName->Length = (USHORT)(wcslen(ObjectName->Buffer) * sizeof(WCHAR));

    TRACE("Parsed initial window station: '%wZ'\n", ObjectName);

    /* Try to open the window station */
    InitializeObjectAttributes(ObjectAttributes,
                               ObjectName,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);
    if (bInherit)
        ObjectAttributes->Attributes |= OBJ_INHERIT;

    Status = ObOpenObjectByName(ObjectAttributes,
                                ExWindowStationObjectType,
                                UserMode,
                                NULL,
                                WINSTA_ACCESS_ALL,
                                NULL,
                                (PHANDLE)&hTempWinSta);
    if (!NT_SUCCESS(Status))
    {
        ERR("Failed to open the window station '%wZ', Status 0x%08lx\n", ObjectName, Status);
    }
    else
    {
        //
        // FIXME TODO: Perform a window station access check!!
        // If we fail AND bUseDefaultWinSta == FALSE we just quit.
        //

        /*
         * Check whether we are opening the (single) interactive
         * window station, and if so, perform an access check.
         */
        /* Check whether we are allowed to perform interactions */
        if (RtlEqualUnicodeString(&WinStaName, &WinSta0Name, TRUE))
        {
            LUID SystemLuid = SYSTEM_LUID;

            /* Interactive window station: check for user LUID */
            WinStaObject = InputWindowStation;

            Status = STATUS_ACCESS_DENIED;

            // TODO: Check also that we compare wrt. window station WinSta0
            // which is the only one that can be interactive on the system.
            if (((!bUseDefaultWinSta || bInherit) && RtlEqualLuid(&ProcessLuid, &SystemLuid)) ||
                 RtlEqualLuid(&ProcessLuid, &WinStaObject->luidUser))
            {
                /* We are interactive on this window station */
                bAccessAllowed = TRUE;
                Status = STATUS_SUCCESS;
            }
        }
        else
        {
            /* Non-interactive window station: we have access since we were able to open it */
            bAccessAllowed = TRUE;
            Status = STATUS_SUCCESS;
        }
    }

    /* If we failed, bail out if we were not trying to open the default window station */
    if (!NT_SUCCESS(Status) && !bUseDefaultWinSta) // if (!bAccessAllowed)
        goto Quit;

    if (/* bAccessAllowed && */ bInteractive || !bAccessAllowed)
    {
        /*
         * Close WinSta0 if the inherited window station is interactive so that
         * we can use it, or we do not have access to the interactive WinSta0.
         */
        ObCloseHandle(hTempWinSta, UserMode);
        hTempWinSta = NULL;
    }
    if (bInteractive == bAccessAllowed)
    {
        /* Keep using the inherited window station */
        NOTHING;
    }
    else // if (bInteractive != bAccessAllowed)
    {
        /*
         * Close the inherited window station, we will either keep using
         * the interactive WinSta0, or use Service-0xXXXX-YYYY$.
         */
        if (hWinStaDup)
        {
            ASSERT(hWinSta == hWinStaDup);
            ObCloseHandle(hWinStaDup, UserMode);
            hWinStaDup = NULL;
        }
        hWinSta = hTempWinSta; // hTempWinSta is NULL in case bAccessAllowed == FALSE
    }

    if (bUseDefaultWinSta)
    {
        if (hWinSta == NULL && !bInteractive)
        {
            /* Build a valid window station name from the LUID */
            Status = RtlStringCbPrintfW(ObjectName->Buffer,
                                        ObjectName->MaximumLength,
                                        L"%wZ\\Service-0x%x-%x$",
                                        &gustrWindowStationsDir,
                                        ProcessLuid.HighPart,
                                        ProcessLuid.LowPart);
            if (!NT_SUCCESS(Status))
            {
                ERR("Impossible to build a valid window station name, Status 0x%08lx\n", Status);
                goto Quit;
            }
            ObjectName->Length = (USHORT)(wcslen(ObjectName->Buffer) * sizeof(WCHAR));

            /*
             * Create or open the non-interactive window station.
             * NOTE: The non-interactive window station handle is never inheritable.
             */
            // FIXME: Set security!
            InitializeObjectAttributes(ObjectAttributes,
                                       ObjectName,
                                       OBJ_CASE_INSENSITIVE | OBJ_OPENIF,
                                       NULL,
                                       NULL);

            Status = IntCreateWindowStation(&hWinSta,
                                            ObjectAttributes,
                                            UserMode,
                                            KernelMode,
                                            MAXIMUM_ALLOWED,
                                            0, 0, 0, 0, 0);
            if (!NT_SUCCESS(Status))
            {
                ASSERT(hWinSta == NULL);
                ERR("Failed to create or open the non-interactive window station '%wZ', Status 0x%08lx\n",
                    ObjectName, Status);
                goto Quit;
            }

            //
            // FIXME: We might not need to always create or open the "Default"
            // desktop on the Service-0xXXXX-YYYY$ window station; we may need
            // to use another one....
            //

            /* Create or open the Default desktop on the window station */
            Status = RtlStringCbCopyW(ObjectName->Buffer,
                                      ObjectName->MaximumLength,
                                      L"Default");
            if (!NT_SUCCESS(Status))
            {
                ERR("Impossible to build a valid desktop name, Status 0x%08lx\n", Status);
                goto Quit;
            }
            ObjectName->Length = (USHORT)(wcslen(ObjectName->Buffer) * sizeof(WCHAR));

            /* NOTE: The non-interactive desktop handle is never inheritable. */
            // FIXME: Set security!
            InitializeObjectAttributes(ObjectAttributes,
                                       ObjectName,
                                       OBJ_CASE_INSENSITIVE | OBJ_OPENIF,
                                       hWinSta,
                                       NULL);

            Status = IntCreateDesktop(&hDesktop,
                                      ObjectAttributes,
                                      UserMode,
                                      NULL,
                                      NULL,
                                      0,
                                      MAXIMUM_ALLOWED);
            if (!NT_SUCCESS(Status))
            {
                ASSERT(hDesktop == NULL);
                ERR("Failed to create or open the desktop '%wZ' on window station 0x%p, Status 0x%08lx\n",
                    ObjectName, hWinSta, Status);
            }

            goto Quit;
        }
/*
        if (hWinSta == NULL)
        {
            Status = STATUS_UNSUCCESSFUL;
            goto Quit;
        }
*/
    }

    /*
     * If we got an inherited desktop handle, duplicate and use it,
     * otherwise open a new desktop.
     */
    if (hDesktop != NULL)
    {
        /* Duplicate the handle if it belongs to another process than the current one */
        if (Process != PsGetCurrentProcess())
        {
            ASSERT(hProcess);
            Status = ZwDuplicateObject(hProcess,
                                       hDesktop,
                                       ZwCurrentProcess(),
                                       (PHANDLE)&hDesktopDup,
                                       0,
                                       0,
                                       DUPLICATE_SAME_ACCESS);
            if (!NT_SUCCESS(Status))
            {
                ERR("IntResolveDesktop: Failed to duplicate the desktop handle, Status 0x%08lx\n", Status);
                /* We will use a default desktop */
                hDesktop = NULL;
            }
            else
            {
                hDesktop = hDesktopDup;
            }
        }
    }

    if ((hWinSta != NULL) && (hDesktop == NULL))
    {
        Status = RtlStringCbCopyNW(ObjectName->Buffer,
                                   ObjectName->MaximumLength,
                                   DesktopName.Buffer,
                                   DesktopName.Length);
        if (!NT_SUCCESS(Status))
        {
            ERR("Impossible to build a valid desktop name, Status 0x%08lx\n", Status);
            goto Quit;
        }
        ObjectName->Length = (USHORT)(wcslen(ObjectName->Buffer) * sizeof(WCHAR));

        TRACE("Parsed initial desktop: '%wZ'\n", ObjectName);

        /* Open the desktop object */
        InitializeObjectAttributes(ObjectAttributes,
                                   ObjectName,
                                   OBJ_CASE_INSENSITIVE,
                                   hWinSta,
                                   NULL);
        if (bInherit)
            ObjectAttributes->Attributes |= OBJ_INHERIT;

        Status = ObOpenObjectByName(ObjectAttributes,
                                    ExDesktopObjectType,
                                    UserMode,
                                    NULL,
                                    DESKTOP_ALL_ACCESS,
                                    NULL,
                                    (PHANDLE)&hDesktop);
        if (!NT_SUCCESS(Status))
        {
            ERR("Failed to open the desktop '%wZ' on window station 0x%p, Status 0x%08lx\n",
                ObjectName, hWinSta, Status);
            goto Quit;
        }
    }

Quit:
    /* Release the object attributes */
    if (ObjectAttributes)
    {
        MemSize = 0;
        ZwFreeVirtualMemory(ZwCurrentProcess(),
                            (PVOID*)&ObjectAttributes,
                            &MemSize,
                            MEM_RELEASE);
    }

    /* Close the temporary process handle */
    if (hProcess) // if (Process != PsGetCurrentProcess())
        ObCloseHandle(hProcess, KernelMode);

    if (NT_SUCCESS(Status))
    {
        *phWinSta  = hWinSta;
        *phDesktop = hDesktop;
        return STATUS_SUCCESS;
    }
    else
    {
        ERR("IntResolveDesktop(%wZ) failed, Status 0x%08lx\n", DesktopPath, Status);

        if (hDesktopDup)
            ObCloseHandle(hDesktopDup, UserMode);
        if (hWinStaDup)
            ObCloseHandle(hWinStaDup, UserMode);

        if (hDesktop)
            ObCloseHandle(hDesktop, UserMode);
        if (hWinSta)
            ObCloseHandle(hWinSta, UserMode);

        SetLastNtError(Status);
        return Status;
    }
}

Referenced by InitThreadCallback(), and NtUserResolveDesktop().

IntSetFocusMessageQueue()

VOID FASTCALL IntSetFocusMessageQueue

(

PUSER_MESSAGE_QUEUE

NewQueue

)

Definition at line 1283 of file desktop.c.

{
    PUSER_MESSAGE_QUEUE Old;
    PDESKTOP pdo = IntGetActiveDesktop();
    if (!pdo)
    {
        TRACE("No active desktop\n");
        return;
    }
    if (NewQueue != NULL)
    {
        if (NewQueue->Desktop != NULL)
        {
            TRACE("Message Queue already attached to another desktop!\n");
            return;
        }
        IntReferenceMessageQueue(NewQueue);
        (void)InterlockedExchangePointer((PVOID*)&NewQueue->Desktop, pdo);
    }
    Old = (PUSER_MESSAGE_QUEUE)InterlockedExchangePointer((PVOID*)&pdo->ActiveMessageQueue, NewQueue);
    if (Old != NULL)
    {
        (void)InterlockedExchangePointer((PVOID*)&Old->Desktop, 0);
        gpqForegroundPrev = Old;
        IntDereferenceMessageQueue(Old);
    }
    // Only one Q can have active foreground even when there are more than one desktop.
    if (NewQueue)
    {
        gpqForeground = pdo->ActiveMessageQueue;
    }
    else
    {
        gpqForeground = NULL;
        ERR("ptiLastInput is CLEARED!!\n");
        ptiLastInput = NULL; // ReactOS hacks,,,, should check for process death.
    }
}

Referenced by co_IntSetForegroundMessageQueue(), co_WinPosActivateOtherWindow(), IntSetThreadDesktop(), MsqCleanupMessageQueue(), and UserAttachThreadInput().

IntSetThreadDesktop()

BOOL IntSetThreadDesktop	(	IN HDESK	hDesktop,
		IN BOOL	FreeOnFailure
	)

Definition at line 3211 of file desktop.c.

{
    PDESKTOP pdesk = NULL, pdeskOld;
    PTHREADINFO pti;
    NTSTATUS Status;
    PCLIENTTHREADINFO pctiOld, pctiNew = NULL;
    PCLIENTINFO pci;

    ASSERT(NtCurrentTeb());

    TRACE("IntSetThreadDesktop hDesktop:0x%p, FOF:%i\n",hDesktop, FreeOnFailure);

    pti = PsGetCurrentThreadWin32Thread();
    pci = pti->pClientInfo;

    /* If the caller gave us a desktop, ensure it is valid */
    if (hDesktop != NULL)
    {
        /* Validate the new desktop. */
        Status = IntValidateDesktopHandle(hDesktop, UserMode, 0, &pdesk);
        if (!NT_SUCCESS(Status))
        {
            ERR("Validation of desktop handle 0x%p failed\n", hDesktop);
            return FALSE;
        }

        if (pti->rpdesk == pdesk)
        {
            /* Nothing to do */
            ObDereferenceObject(pdesk);
            return TRUE;
        }
    }

    /* Make sure that we don't own any window in the current desktop */
    if (!IsListEmpty(&pti->WindowListHead))
    {
        if (pdesk)
            ObDereferenceObject(pdesk);
        ERR("Attempted to change thread desktop although the thread has windows!\n");
        EngSetLastError(ERROR_BUSY);
        return FALSE;
    }

    /* Desktop is being re-set so clear out foreground. */
    if (pti->rpdesk != pdesk && pti->MessageQueue == gpqForeground)
    {
        // Like above, there shouldn't be any windows, hooks or anything active on this threads desktop!
        IntSetFocusMessageQueue(NULL);
    }

    /* Before doing the switch, map the new desktop heap and allocate the new pcti */
    if (pdesk != NULL)
    {
        Status = IntMapDesktopView(pdesk);
        if (!NT_SUCCESS(Status))
        {
            ERR("Failed to map desktop heap!\n");
            ObDereferenceObject(pdesk);
            SetLastNtError(Status);
            return FALSE;
        }

        pctiNew = DesktopHeapAlloc(pdesk, sizeof(CLIENTTHREADINFO));
        if (pctiNew == NULL)
        {
            ERR("Failed to allocate new pcti\n");
            IntUnmapDesktopView(pdesk);
            ObDereferenceObject(pdesk);
            EngSetLastError(ERROR_NOT_ENOUGH_MEMORY);
            return FALSE;
        }
    }

    /*
     * Processes, in particular Winlogon.exe, that manage window stations
     * (especially the interactive WinSta0 window station) and desktops,
     * may not be able to connect at startup to a window station and have
     * an associated desktop as well, if none exists on the system already.
     * Because creating a new window station does not affect the window station
     * associated to the process, and because neither by associating a window
     * station to the process nor creating a new desktop on it does associate
     * a startup desktop to that process, the process has to actually assigns
     * one of its threads to a desktop so that it gets automatically an assigned
     * startup desktop.
     *
     * This is what actually happens for Winlogon.exe, which is started without
     * any window station and desktop. By creating the first (and therefore
     * interactive) WinSta0 window station, then assigning WinSta0 to itself
     * and creating the Default desktop on it, and then assigning this desktop
     * to its main thread, Winlogon.exe basically does the similar steps that
     * would have been done automatically at its startup if there were already
     * an existing WinSta0 window station and Default desktop.
     *
     * Of course all this must not be done if we are a SYSTEM or CSRSS thread.
     */
    // if (pti->ppi->peProcess != gpepCSRSS)
    if (!(pti->TIF_flags & (TIF_SYSTEMTHREAD | TIF_CSRSSTHREAD)) &&
        pti->ppi->rpdeskStartup == NULL && hDesktop != NULL)
    {
        ERR("The process 0x%p '%s' didn't have an assigned startup desktop before, assigning it now!\n",
            pti->ppi->peProcess, pti->ppi->peProcess->ImageFileName);

        pti->ppi->hdeskStartup = hDesktop;
        pti->ppi->rpdeskStartup = pdesk;
    }

    /* free all classes or move them to the shared heap */
    if (pti->rpdesk != NULL)
    {
        if (!IntCheckProcessDesktopClasses(pti->rpdesk, FreeOnFailure))
        {
            ERR("Failed to move process classes to shared heap!\n");
            if (pdesk)
            {
                DesktopHeapFree(pdesk, pctiNew);
                IntUnmapDesktopView(pdesk);
                ObDereferenceObject(pdesk);
            }
            return FALSE;
        }
    }

    pdeskOld = pti->rpdesk;
    if (pti->pcti != &pti->cti)
        pctiOld = pti->pcti;
    else
        pctiOld = NULL;

    /* do the switch */
    if (pdesk != NULL)
    {
        pti->rpdesk = pdesk;
        pti->hdesk = hDesktop;
        pti->pDeskInfo = pti->rpdesk->pDeskInfo;
        pti->pcti = pctiNew;

        pci->ulClientDelta = DesktopHeapGetUserDelta();
        pci->pDeskInfo = (PVOID)((ULONG_PTR)pti->pDeskInfo - pci->ulClientDelta);
        pci->pClientThreadInfo = (PVOID)((ULONG_PTR)pti->pcti - pci->ulClientDelta);

        /* initialize the new pcti */
        if (pctiOld != NULL)
        {
            RtlCopyMemory(pctiNew, pctiOld, sizeof(CLIENTTHREADINFO));
        }
        else
        {
            RtlZeroMemory(pctiNew, sizeof(CLIENTTHREADINFO));
            pci->fsHooks = pti->fsHooks;
            pci->dwTIFlags = pti->TIF_flags;
        }
    }
    else
    {
        pti->rpdesk = NULL;
        pti->hdesk = NULL;
        pti->pDeskInfo = NULL;
        pti->pcti = &pti->cti; // Always point inside so there will be no crash when posting or sending msg's!
        pci->ulClientDelta = 0;
        pci->pDeskInfo = NULL;
        pci->pClientThreadInfo = NULL;
    }

    /* clean up the old desktop */
    if (pdeskOld != NULL)
    {
        RemoveEntryList(&pti->PtiLink);
        if (pctiOld) DesktopHeapFree(pdeskOld, pctiOld);
        IntUnmapDesktopView(pdeskOld);
        ObDereferenceObject(pdeskOld);
    }

    if (pdesk)
    {
        InsertTailList(&pdesk->PtiList, &pti->PtiLink);
    }

    TRACE("IntSetThreadDesktop: pti 0x%p ppi 0x%p switched from object 0x%p to 0x%p\n", pti, pti->ppi, pdeskOld, pdesk);

    return TRUE;
}

Referenced by DesktopWindowProc(), ExitThreadCallback(), InitThreadCallback(), NtUserSetInformationThread(), and NtUserSetThreadDesktop().

IntUnmapDesktopView()

static NTSTATUS IntUnmapDesktopView ( IN PDESKTOP  pdesk )

static

Definition at line 3093 of file desktop.c.

{
    PPROCESSINFO ppi;
    PW32HEAP_USER_MAPPING HeapMapping, *PrevLink;
    NTSTATUS Status = STATUS_SUCCESS;

    TRACE("IntUnmapDesktopView called for desktop object %p\n", pdesk);

    ppi = PsGetCurrentProcessWin32Process();

    /*
     * Unmap if we're the last thread using the desktop.
     * Start the search at the next mapping: skip the first entry
     * as it must be the global user heap mapping.
     */
    PrevLink = &ppi->HeapMappings.Next;
    HeapMapping = *PrevLink;
    while (HeapMapping != NULL)
    {
        if (HeapMapping->KernelMapping == (PVOID)pdesk->pheapDesktop)
        {
            if (--HeapMapping->Count == 0)
            {
                *PrevLink = HeapMapping->Next;

                TRACE("ppi 0x%p unmapped heap of desktop 0x%p\n", ppi, pdesk);
                Status = MmUnmapViewOfSection(PsGetCurrentProcess(),
                                              HeapMapping->UserMapping);

                ObDereferenceObject(pdesk);

                UserHeapFree(HeapMapping);
                break;
            }
        }

        PrevLink = &HeapMapping->Next;
        HeapMapping = HeapMapping->Next;
    }

    return Status;
}

Referenced by IntDesktopObjectClose(), and IntSetThreadDesktop().

IntValidateDesktopHandle()

NTSTATUS FASTCALL IntValidateDesktopHandle	(	HDESK	Desktop,
		KPROCESSOR_MODE	AccessMode,
		ACCESS_MASK	DesiredAccess,
		PDESKTOP *	Object
	)

Definition at line 1200 of file desktop.c.

{
    NTSTATUS Status;

    Status = ObReferenceObjectByHandle(
                Desktop,
                DesiredAccess,
                ExDesktopObjectType,
                AccessMode,
                (PVOID*)Object,
                NULL);

    TRACE("IntValidateDesktopHandle: handle:0x%p obj:0x%p access:0x%x Status:0x%lx\n",
          Desktop, *Object, DesiredAccess, Status);

    if (!NT_SUCCESS(Status))
        SetLastNtError(Status);

    return Status;
}

Referenced by InitThreadCallback(), IntSetThreadDesktop(), NtUserBuildHwndList(), NtUserCloseDesktop(), NtUserGetObjectInformation(), and NtUserSwitchDesktop().

NtUserCloseDesktop()

BOOL APIENTRY NtUserCloseDesktop

(

HDESK

hDesktop

)

Definition at line 2677 of file desktop.c.

{
    PDESKTOP pdesk;
    NTSTATUS Status;
    DECLARE_RETURN(BOOL);

    TRACE("NtUserCloseDesktop(0x%p) called\n", hDesktop);
    UserEnterExclusive();

    if (hDesktop == gptiCurrent->hdesk || hDesktop == gptiCurrent->ppi->hdeskStartup)
    {
        ERR("Attempted to close thread desktop\n");
        EngSetLastError(ERROR_BUSY);
        RETURN(FALSE);
    }

    Status = IntValidateDesktopHandle(hDesktop, UserMode, 0, &pdesk);
    if (!NT_SUCCESS(Status))
    {
        ERR("Validation of desktop handle 0x%p failed\n", hDesktop);
        RETURN(FALSE);
    }

    ObDereferenceObject(pdesk);

    Status = ObCloseHandle(hDesktop, UserMode);
    if (!NT_SUCCESS(Status))
    {
        ERR("Failed to close desktop handle 0x%p\n", hDesktop);
        SetLastNtError(Status);
        RETURN(FALSE);
    }

    RETURN(TRUE);

CLEANUP:
    TRACE("Leave NtUserCloseDesktop, ret=%i\n",_ret_);
    UserLeave();
    END_CLEANUP;
}

Referenced by CloseDesktop().

NtUserCreateDesktop()

HDESK APIENTRY NtUserCreateDesktop	(	POBJECT_ATTRIBUTES	ObjectAttributes,
		PUNICODE_STRING	lpszDesktopDevice,
		LPDEVMODEW	lpdmw,
		DWORD	dwFlags,
		ACCESS_MASK	dwDesiredAccess
	)

Definition at line 2483 of file desktop.c.

{
    NTSTATUS Status;
    HDESK hDesk;

    DECLARE_RETURN(HDESK);

    TRACE("Enter NtUserCreateDesktop\n");
    UserEnterExclusive();

    Status = IntCreateDesktop(&hDesk,
                              ObjectAttributes,
                              UserMode,
                              lpszDesktopDevice,
                              lpdmw,
                              dwFlags,
                              dwDesiredAccess);
    if (!NT_SUCCESS(Status))
    {
        ERR("IntCreateDesktop failed, Status 0x%08lx\n", Status);
        // SetLastNtError(Status);
        RETURN(NULL);
    }

    RETURN(hDesk);

CLEANUP:
    TRACE("Leave NtUserCreateDesktop, ret=0x%p\n", _ret_);
    UserLeave();
    END_CLEANUP;
}

Referenced by CreateDesktopW().

NtUserGetThreadDesktop()

HDESK APIENTRY NtUserGetThreadDesktop	(	DWORD	dwThreadId,
		HDESK	hConsoleDesktop
	)

Definition at line 2984 of file desktop.c.

{
    HDESK hDesk;
    NTSTATUS Status;
    PTHREADINFO pti;
    PEPROCESS Process;
    PDESKTOP DesktopObject;
    OBJECT_HANDLE_INFORMATION HandleInformation;

    UserEnterExclusive();
    TRACE("Enter NtUserGetThreadDesktop\n");

    if (!dwThreadId)
    {
        EngSetLastError(ERROR_INVALID_PARAMETER);
        hDesk = NULL;
        goto Quit;
    }

    /* Validate the Win32 thread and retrieve its information */
    pti = IntTID2PTI(UlongToHandle(dwThreadId));
    if (pti)
    {
        /* Get the desktop handle of the thread */
        hDesk = pti->hdesk;
        Process = pti->ppi->peProcess;
    }
    else if (hConsoleDesktop)
    {
        /*
         * The thread may belong to a console, so attempt to use the provided
         * console desktop handle as a fallback. Otherwise this means that the
         * thread is either not Win32 or invalid.
         */
        hDesk = hConsoleDesktop;
        Process = gpepCSRSS;
    }
    else
    {
        EngSetLastError(ERROR_INVALID_PARAMETER);
        hDesk = NULL;
        goto Quit;
    }

    if (!hDesk)
    {
        ERR("Desktop information of thread 0x%x broken!?\n", dwThreadId);
        goto Quit;
    }

    if (Process == PsGetCurrentProcess())
    {
        /*
         * Just return the handle, since we queried the desktop handle
         * of a thread running in the same context.
         */
        goto Quit;
    }

    /*
     * We could just use the cached rpdesk instead of looking up the handle,
     * but it may actually be safer to validate the desktop and get a temporary
     * reference to it so that it does not disappear under us (e.g. when the
     * desktop is being destroyed) during the operation.
     */
    /*
     * Switch into the context of the thread we are trying to get
     * the desktop from, so we can use the handle.
     */
    KeAttachProcess(&Process->Pcb);
    Status = ObReferenceObjectByHandle(hDesk,
                                       0,
                                       ExDesktopObjectType,
                                       UserMode,
                                       (PVOID*)&DesktopObject,
                                       &HandleInformation);
    KeDetachProcess();

    if (NT_SUCCESS(Status))
    {
        /*
         * Lookup our handle table if we can find a handle to the desktop object.
         * If not, create one.
         * QUESTION: Do we really need to create a handle in case it doesn't exist??
         */
        hDesk = IntGetDesktopObjectHandle(DesktopObject);

        /* All done, we got a valid handle to the desktop */
        ObDereferenceObject(DesktopObject);
    }
    else
    {
        /* The handle could not be found, there is nothing to get... */
        hDesk = NULL;
    }

    if (!hDesk)
    {
        ERR("Could not retrieve or access desktop for thread 0x%x\n", dwThreadId);
        EngSetLastError(ERROR_ACCESS_DENIED);
    }

Quit:
    TRACE("Leave NtUserGetThreadDesktop, hDesk = 0x%p\n", hDesk);
    UserLeave();
    return hDesk;
}

Referenced by GetThreadDesktop().

NtUserOpenDesktop()

HDESK APIENTRY NtUserOpenDesktop	(	POBJECT_ATTRIBUTES	ObjectAttributes,
		DWORD	dwFlags,
		ACCESS_MASK	dwDesiredAccess
	)

Definition at line 2543 of file desktop.c.

{
    NTSTATUS Status;
    HDESK Desktop;

    Status = ObOpenObjectByName(
                 ObjectAttributes,
                 ExDesktopObjectType,
                 UserMode,
                 NULL,
                 dwDesiredAccess,
                 NULL,
                 (HANDLE*)&Desktop);

    if (!NT_SUCCESS(Status))
    {
        ERR("Failed to open desktop\n");
        SetLastNtError(Status);
        return NULL;
    }

    TRACE("Opened desktop %S with handle 0x%p\n", ObjectAttributes->ObjectName->Buffer, Desktop);

    return Desktop;
}

Referenced by OpenDesktopW().

NtUserOpenInputDesktop()

HDESK APIENTRY NtUserOpenInputDesktop	(	DWORD	dwFlags,
		BOOL	fInherit,
		ACCESS_MASK	dwDesiredAccess
	)

Definition at line 2637 of file desktop.c.

{
    HDESK hdesk;

    UserEnterExclusive();
    TRACE("Enter NtUserOpenInputDesktop gpdeskInputDesktop 0x%p\n",gpdeskInputDesktop);

    hdesk = UserOpenInputDesktop(dwFlags, fInherit, dwDesiredAccess);

    TRACE("NtUserOpenInputDesktop returning 0x%p\n",hdesk);
    UserLeave();
    return hdesk;
}

Referenced by OpenInputDesktop().

NtUserPaintDesktop()

BOOL APIENTRY NtUserPaintDesktop

(

HDC

hDC

)

Definition at line 2734 of file desktop.c.

{
    BOOL Ret;
    UserEnterExclusive();
    TRACE("Enter NtUserPaintDesktop\n");
    Ret = IntPaintDesktop(hDC);
    TRACE("Leave NtUserPaintDesktop, ret=%i\n",Ret);
    UserLeave();
    return Ret;
}

Referenced by PaintDesktop().

NtUserResolveDesktop()

HDESK NTAPI NtUserResolveDesktop	(	IN HANDLE	ProcessHandle,
		IN PUNICODE_STRING	DesktopPath,
		IN BOOL	bInherit,
		OUT HWINSTA *	phWinSta
	)

Definition at line 2781 of file desktop.c.

{
    NTSTATUS Status;
    PEPROCESS Process;
    HWINSTA hWinSta = NULL;
    HDESK hDesktop  = NULL;
    UNICODE_STRING CapturedDesktopPath;

    /* Allow only the Console Server to perform this operation (via CSRSS) */
    if (PsGetCurrentProcess() != gpepCSRSS)
        return NULL;

    /* Get the process object the user handle was referencing */
    Status = ObReferenceObjectByHandle(ProcessHandle,
                                       PROCESS_QUERY_INFORMATION,
                                       *PsProcessType,
                                       UserMode,
                                       (PVOID*)&Process,
                                       NULL);
    if (!NT_SUCCESS(Status))
        return NULL;

    // UserEnterShared();

    _SEH2_TRY
    {
        /* Probe the handle pointer */
        // ProbeForWriteHandle
        ProbeForWrite(phWinSta, sizeof(HWINSTA), sizeof(HWINSTA));
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        Status = _SEH2_GetExceptionCode();
        _SEH2_YIELD(goto Quit);
    }
    _SEH2_END;

    /* Capture the user desktop path string */
    Status = ProbeAndCaptureUnicodeString(&CapturedDesktopPath,
                                          UserMode,
                                          DesktopPath);
    if (!NT_SUCCESS(Status))
        goto Quit;

    /* Call the internal function */
    Status = IntResolveDesktop(Process,
                               &CapturedDesktopPath,
                               bInherit,
                               &hWinSta,
                               &hDesktop);
    if (!NT_SUCCESS(Status))
    {
        ERR("IntResolveDesktop failed, Status 0x%08lx\n", Status);
        hWinSta  = NULL;
        hDesktop = NULL;
    }

    _SEH2_TRY
    {
        /* Return the window station handle */
        *phWinSta = hWinSta;
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        Status = _SEH2_GetExceptionCode();

        /* We failed, close the opened desktop and window station */
        if (hDesktop) ObCloseHandle(hDesktop, UserMode);
        hDesktop = NULL;
        if (hWinSta) ObCloseHandle(hWinSta, UserMode);
    }
    _SEH2_END;

    /* Free the captured string */
    ReleaseCapturedUnicodeString(&CapturedDesktopPath, UserMode);

Quit:
    // UserLeave();

    /* Dereference the process object */
    ObDereferenceObject(Process);

    /* Return the desktop handle */
    return hDesktop;
}

Referenced by GuiInit().

NtUserSetThreadDesktop()

BOOL APIENTRY NtUserSetThreadDesktop

(

HDESK

hDesktop

)

Definition at line 3403 of file desktop.c.

{
    BOOL ret = FALSE;

    UserEnterExclusive();

    // FIXME: IntSetThreadDesktop validates the desktop handle, it should happen
    // here too and set the NT error level. Q. Is it necessary to have the validation
    // in IntSetThreadDesktop? Is it needed there too?
    if (hDesktop || (!hDesktop && PsGetCurrentProcess() == gpepCSRSS))
        ret = IntSetThreadDesktop(hDesktop, FALSE);

    UserLeave();

    return ret;
}

Referenced by SetThreadDesktop().

NtUserSwitchDesktop()

BOOL APIENTRY NtUserSwitchDesktop

(

HDESK

hdesk

)

Definition at line 2888 of file desktop.c.

{
    PDESKTOP pdesk;
    NTSTATUS Status;
    BOOL bRedrawDesktop;
    DECLARE_RETURN(BOOL);

    UserEnterExclusive();
    TRACE("Enter NtUserSwitchDesktop(0x%p)\n", hdesk);

    Status = IntValidateDesktopHandle(hdesk, UserMode, 0, &pdesk);
    if (!NT_SUCCESS(Status))
    {
        ERR("Validation of desktop handle 0x%p failed\n", hdesk);
        RETURN(FALSE);
    }

    if (PsGetCurrentProcessSessionId() != pdesk->rpwinstaParent->dwSessionId)
    {
        ObDereferenceObject(pdesk);
        ERR("NtUserSwitchDesktop called for a desktop of a different session\n");
        RETURN(FALSE);
    }

    if (pdesk == gpdeskInputDesktop)
    {
        ObDereferenceObject(pdesk);
        WARN("NtUserSwitchDesktop called for active desktop\n");
        RETURN(TRUE);
    }

    /*
     * Don't allow applications switch the desktop if it's locked, unless the caller
     * is the logon application itself
     */
    if ((pdesk->rpwinstaParent->Flags & WSS_LOCKED) &&
        gpidLogon != PsGetCurrentProcessId())
    {
        ObDereferenceObject(pdesk);
        ERR("Switching desktop 0x%p denied because the window station is locked!\n", hdesk);
        RETURN(FALSE);
    }

    if (pdesk->rpwinstaParent != InputWindowStation)
    {
        ObDereferenceObject(pdesk);
        ERR("Switching desktop 0x%p denied because desktop doesn't belong to the interactive winsta!\n", hdesk);
        RETURN(FALSE);
    }

    /* FIXME: Fail if the process is associated with a secured
              desktop such as Winlogon or Screen-Saver */
    /* FIXME: Connect to input device */

    TRACE("Switching from desktop 0x%p to 0x%p\n", gpdeskInputDesktop, pdesk);

    bRedrawDesktop = FALSE;

    /* The first time SwitchDesktop is called, gpdeskInputDesktop is NULL */
    if (gpdeskInputDesktop != NULL)
    {
        if ((gpdeskInputDesktop->pDeskInfo->spwnd->style & WS_VISIBLE) == WS_VISIBLE)
            bRedrawDesktop = TRUE;

        /* Hide the previous desktop window */
        IntHideDesktop(gpdeskInputDesktop);
    }

    /* Set the active desktop in the desktop's window station. */
    InputWindowStation->ActiveDesktop = pdesk;

    /* Set the global state. */
    gpdeskInputDesktop = pdesk;

    /* Show the new desktop window */
    co_IntShowDesktop(pdesk, UserGetSystemMetrics(