input.c

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/*
 * COPYRIGHT:        See COPYING in the top level directory
 * PROJECT:          ReactOS Win32k subsystem
 * PURPOSE:          General input functions
 * FILE:             win32ss/user/ntuser/input.c
 * PROGRAMERS:       Casper S. Hornstrup (chorns@users.sourceforge.net)
 *                   Rafal Harabien (rafalh@reactos.org)
 */
 
#include <win32k.h>
DBG_DEFAULT_CHANNEL(UserInput);
 
/* LastRITEventTickCount update cycle has been adjusted from 60s to 1s since NT6 */
#if (NTDDI_VERSION < NTDDI_VISTA)
#define LAST_RIT_EVENT_UPDATE_INTERVAL 60000UL
#else
#define LAST_RIT_EVENT_UPDATE_INTERVAL 1000UL
#endif
 
/* GLOBALS *******************************************************************/
 
PTHREADINFO ptiRawInput;
PKTIMER MasterTimer = NULL;
PATTACHINFO gpai = NULL;
INT paiCount = 0;
HANDLE ghKeyboardDevice = NULL;
 
static DWORD LastInputTick = 0;
static HANDLE ghMouseDevice;
 
/* FUNCTIONS *****************************************************************/
 
/*
 * IntLastInputTick
 *
 * Updates or gets last input tick count
 */
static DWORD FASTCALL
IntLastInputTick(BOOL bUpdate)
{
    if (bUpdate)
    {
        LastInputTick = EngGetTickCount32();
        if (gpsi)
        {
            gpsi->dwLastRITEventTickCount = LastInputTick;
            if (gpsi->dwLastRITEventTickCount - gpsi->dwLastSystemRITEventTickCountUpdate >
                LAST_RIT_EVENT_UPDATE_INTERVAL)
            {
                SharedUserData->LastSystemRITEventTickCount = LastInputTick;
                gpsi->dwLastSystemRITEventTickCountUpdate = LastInputTick;
            }
        }
    }
    return LastInputTick;
}
 
/*
 * DoTheScreenSaver
 *
 * Check if screensaver should be started and sends message to SAS window
 */
VOID FASTCALL
DoTheScreenSaver(VOID)
{
    DWORD Test, TO;
 
    if (gspv.iScrSaverTimeout > 0) // Zero means Off.
    {
        Test = EngGetTickCount32();
        Test = Test - LastInputTick;
        TO = 1000 * gspv.iScrSaverTimeout;
        if (Test > TO)
        {
            TRACE("Screensaver Message Start! Tick %lu Timeout %d \n", Test, gspv.iScrSaverTimeout);
 
            if (ppiScrnSaver) // We are or we are not the screensaver, prevent reentry...
            {
                if (!(ppiScrnSaver->W32PF_flags & W32PF_IDLESCREENSAVER))
                {
                    ppiScrnSaver->W32PF_flags |= W32PF_IDLESCREENSAVER;
                    ERR("Screensaver is Idle\n");
                }
            }
            else
            {
                PUSER_MESSAGE_QUEUE ForegroundQueue = IntGetFocusMessageQueue();
                if (ForegroundQueue && ForegroundQueue->spwndActive)
                    UserPostMessage(hwndSAS, WM_LOGONNOTIFY, LN_START_SCREENSAVE, 1); // lParam 1 == Secure
                else
                    UserPostMessage(hwndSAS, WM_LOGONNOTIFY, LN_START_SCREENSAVE, 0);
            }
        }
    }
}
 
/*
 * OpenInputDevice
 *
 * Opens input device for asynchronous access
 */
static
NTSTATUS NTAPI
OpenInputDevice(PHANDLE pHandle, PFILE_OBJECT *ppObject, CONST WCHAR *pszDeviceName)
{
    UNICODE_STRING DeviceName;
    OBJECT_ATTRIBUTES ObjectAttributes;
    NTSTATUS Status;
    IO_STATUS_BLOCK Iosb;
 
    RtlInitUnicodeString(&DeviceName, pszDeviceName);
 
    InitializeObjectAttributes(&ObjectAttributes,
                               &DeviceName,
                               OBJ_KERNEL_HANDLE,
                               NULL,
                               NULL);
 
    Status = ZwOpenFile(pHandle,
                        FILE_ALL_ACCESS,
                        &ObjectAttributes,
                        &Iosb,
                        0,
                        0);
    if (NT_SUCCESS(Status) && ppObject)
    {
        Status = ObReferenceObjectByHandle(*pHandle, SYNCHRONIZE, NULL, KernelMode, (PVOID*)ppObject, NULL);
        ASSERT(NT_SUCCESS(Status));
    }
 
    return Status;
}
 
/*
 * RawInputThreadMain
 *
 * Reads data from input devices and supports win32 timers
 */
VOID NTAPI
RawInputThreadMain(VOID)
{
    NTSTATUS MouStatus = STATUS_UNSUCCESSFUL, KbdStatus = STATUS_UNSUCCESSFUL, Status;
    IO_STATUS_BLOCK MouIosb, KbdIosb;
    PFILE_OBJECT pKbdDevice = NULL, pMouDevice = NULL;
    LARGE_INTEGER ByteOffset;
    //LARGE_INTEGER WaitTimeout;
    PVOID WaitObjects[4], pSignaledObject = NULL;
    KWAIT_BLOCK WaitBlockArray[RTL_NUMBER_OF(WaitObjects)];
    ULONG cWaitObjects = 0, cMaxWaitObjects = 2;
    MOUSE_INPUT_DATA MouseInput;
    KEYBOARD_INPUT_DATA KeyInput;
    PVOID ShutdownEvent;
    HWINSTA hWinSta;
 
    ByteOffset.QuadPart = (LONGLONG)0;
    //WaitTimeout.QuadPart = (LONGLONG)(-10000000);
 
    ptiRawInput = GetW32ThreadInfo();
    ptiRawInput->TIF_flags |= TIF_SYSTEMTHREAD;
    ptiRawInput->pClientInfo->dwTIFlags = ptiRawInput->TIF_flags;
 
    TRACE("Raw Input Thread %p\n", ptiRawInput);
 
    KeSetPriorityThread(&PsGetCurrentThread()->Tcb,
                        LOW_REALTIME_PRIORITY + 3);
 
    Status = ObOpenObjectByPointer(InputWindowStation,
                                   0,
                                   NULL,
                                   MAXIMUM_ALLOWED,
                                   ExWindowStationObjectType,
                                   UserMode,
                                   (PHANDLE)&hWinSta);
    if (NT_SUCCESS(Status))
    {
        UserSetProcessWindowStation(hWinSta);
    }
    else
    {
        ASSERT(FALSE);
        /* Failed to open the interactive winsta! What now? */
    }
 
    UserEnterExclusive();
    StartTheTimers();
    UserLeave();
 
    NT_ASSERT(ghMouseDevice == NULL);
    NT_ASSERT(ghKeyboardDevice == NULL);
 
    PoRequestShutdownEvent(&ShutdownEvent);
    for (;;)
    {
        if (!ghMouseDevice)
        {
            /* Check if mouse device already exists */
            Status = OpenInputDevice(&ghMouseDevice, &pMouDevice, L"\\Device\\PointerClass0" );
            if (NT_SUCCESS(Status))
            {
                ++cMaxWaitObjects;
                TRACE("Mouse connected!\n");
            }
        }
        if (!ghKeyboardDevice)
        {
            /* Check if keyboard device already exists */
            Status = OpenInputDevice(&ghKeyboardDevice, &pKbdDevice, L"\\Device\\KeyboardClass0");
            if (NT_SUCCESS(Status))
            {
                ++cMaxWaitObjects;
                TRACE("Keyboard connected!\n");
                // Get and load keyboard attributes.
                UserInitKeyboard(ghKeyboardDevice);
                UserEnterExclusive();
                // Register the Window hotkey.
                UserRegisterHotKey(PWND_BOTTOM, IDHK_WINKEY, MOD_WIN, 0);
                // Register the Window Snap hotkey.
                UserRegisterHotKey(PWND_BOTTOM, IDHK_SNAP_LEFT, MOD_WIN, VK_LEFT);
                UserRegisterHotKey(PWND_BOTTOM, IDHK_SNAP_RIGHT, MOD_WIN, VK_RIGHT);
                UserRegisterHotKey(PWND_BOTTOM, IDHK_SNAP_UP, MOD_WIN, VK_UP);
                UserRegisterHotKey(PWND_BOTTOM, IDHK_SNAP_DOWN, MOD_WIN, VK_DOWN);
                // Register the debug hotkeys.
                SetDebugHotKeys();
                UserLeave();
            }
        }
 
        /* Reset WaitHandles array */
        cWaitObjects = 0;
        WaitObjects[cWaitObjects++] = ShutdownEvent;
        WaitObjects[cWaitObjects++] = MasterTimer;
 
        if (ghMouseDevice)
        {
            /* Try to read from mouse if previous reading is not pending */
            if (MouStatus != STATUS_PENDING)
            {
                MouStatus = ZwReadFile(ghMouseDevice,
                                       NULL,
                                       NULL,
                                       NULL,
                                       &MouIosb,
                                       &MouseInput,
                                       sizeof(MOUSE_INPUT_DATA),
                                       &ByteOffset,
                                       NULL);
            }
 
            if (MouStatus == STATUS_PENDING)
                WaitObjects[cWaitObjects++] = &pMouDevice->Event;
        }
 
        if (ghKeyboardDevice)
        {
            /* Try to read from keyboard if previous reading is not pending */
            if (KbdStatus != STATUS_PENDING)
            {
                KbdStatus = ZwReadFile(ghKeyboardDevice,
                                       NULL,
                                       NULL,
                                       NULL,
                                       &KbdIosb,
                                       &KeyInput,
                                       sizeof(KEYBOARD_INPUT_DATA),
                                       &ByteOffset,
                                       NULL);
 
            }
            if (KbdStatus == STATUS_PENDING)
                WaitObjects[cWaitObjects++] = &pKbdDevice->Event;
        }
 
        /* If all objects are pending, wait for them */
        if (cWaitObjects == cMaxWaitObjects)
        {
            Status = KeWaitForMultipleObjects(cWaitObjects,
                                              WaitObjects,
                                              WaitAny,
                                              UserRequest,
                                              KernelMode,
                                              TRUE,
                                              NULL,//&WaitTimeout,
                                              WaitBlockArray);
 
            if ((Status >= STATUS_WAIT_0) &&
                (Status < (STATUS_WAIT_0 + (LONG)cWaitObjects)))
            {
                /* Some device has finished reading */
                pSignaledObject = WaitObjects[Status - STATUS_WAIT_0];
 
                /* Check if it is mouse or keyboard and update status */
                if ((MouStatus == STATUS_PENDING) &&
                    (pSignaledObject == &pMouDevice->Event))
                {
                    MouStatus = MouIosb.Status;
                }
                else if ((KbdStatus == STATUS_PENDING) &&
                         (pSignaledObject == &pKbdDevice->Event))
                {
                    KbdStatus = KbdIosb.Status;
                }
                else if (pSignaledObject == MasterTimer)
                {
                    ProcessTimers();
                }
                else if (pSignaledObject == ShutdownEvent)
                {
                    break;
                }
                else ASSERT(FALSE);
            }
        }
 
        /* Have we successed reading from mouse? */
        if (NT_SUCCESS(MouStatus) && MouStatus != STATUS_PENDING)
        {
            TRACE("MouseEvent\n");
 
            /* Set LastInputTick */
            IntLastInputTick(TRUE);
 
            /* Process data */
            UserEnterExclusive();
            UserProcessMouseInput(&MouseInput);
            UserLeave();
        }
        else if (MouStatus != STATUS_PENDING)
            ERR("Failed to read from mouse: %x.\n", MouStatus);
 
        /* Have we successed reading from keyboard? */
        if (NT_SUCCESS(KbdStatus) && KbdStatus != STATUS_PENDING)
        {
            TRACE("KeyboardEvent: %s %04x\n",
                  (KeyInput.Flags & KEY_BREAK) ? "up" : "down",
                  KeyInput.MakeCode);
 
            /* Set LastInputTick */
            IntLastInputTick(TRUE);
 
            /* Process data */
            UserEnterExclusive();
            UserProcessKeyboardInput(&KeyInput);
            UserLeave();
        }
        else if (KbdStatus != STATUS_PENDING)
            ERR("Failed to read from keyboard: %x.\n", KbdStatus);
    }
 
    if (ghMouseDevice)
    {
        (void)ZwCancelIoFile(ghMouseDevice, &MouIosb);
        ObCloseHandle(ghMouseDevice, KernelMode);
        ObDereferenceObject(pMouDevice);
        ghMouseDevice = NULL;
    }
 
    if (ghKeyboardDevice)
    {
        (void)ZwCancelIoFile(ghKeyboardDevice, &KbdIosb);
        ObCloseHandle(ghKeyboardDevice, KernelMode);
        ObDereferenceObject(pKbdDevice);
        ghKeyboardDevice = NULL;
    }
 
    ERR("Raw Input Thread Exit!\n");
}
 
/*
 * InitInputImpl
 *
 * Inits input implementation
 */
CODE_SEG("INIT")
NTSTATUS
NTAPI
InitInputImpl(VOID)
{
    MasterTimer = ExAllocatePoolWithTag(NonPagedPool, sizeof(KTIMER), USERTAG_SYSTEM);
    if (!MasterTimer)
    {
        ERR("Failed to allocate memory\n");
        ASSERT(FALSE);
        return STATUS_UNSUCCESSFUL;
    }
    KeInitializeTimer(MasterTimer);
 
    return STATUS_SUCCESS;
}
 
BOOL FASTCALL
IntBlockInput(PTHREADINFO pti, BOOL BlockIt)
{
    PTHREADINFO OldBlock;
    ASSERT(pti);
 
    if(!pti->rpdesk || ((pti->TIF_flags & TIF_INCLEANUP) && BlockIt))
    {
        /*
         * Fail blocking if exiting the thread
         */
 
        return FALSE;
    }
 
    /*
     * FIXME: Check access rights of the window station
     *        e.g. services running in the service window station cannot block input
     */
    if(!ThreadHasInputAccess(pti) ||
       !IntIsActiveDesktop(pti->rpdesk))
    {
        EngSetLastError(ERROR_ACCESS_DENIED);
        return FALSE;
    }
 
    ASSERT(pti->rpdesk);
    OldBlock = pti->rpdesk->BlockInputThread;
    if(OldBlock)
    {
        if(OldBlock != pti)
        {
            EngSetLastError(ERROR_ACCESS_DENIED);
            return FALSE;
        }
        pti->rpdesk->BlockInputThread = (BlockIt ? pti : NULL);
        return OldBlock == NULL;
    }
 
    pti->rpdesk->BlockInputThread = (BlockIt ? pti : NULL);
    return OldBlock == NULL;
}
 
BOOL
APIENTRY
NtUserBlockInput(
    BOOL BlockIt)
{
    BOOL ret;
 
    TRACE("Enter NtUserBlockInput\n");
    UserEnterExclusive();
 
    ret = IntBlockInput(PsGetCurrentThreadWin32Thread(), BlockIt);
 
    UserLeave();
    TRACE("Leave NtUserBlockInput, ret=%i\n", ret);
 
    return ret;
}
 
BOOL
FASTCALL
IsRemoveAttachThread(PTHREADINFO pti)
{
    NTSTATUS Status;
    PATTACHINFO pai;
    BOOL Ret = TRUE;
    PTHREADINFO ptiFrom = NULL, ptiTo = NULL;
 
    do
    {
       if (!gpai) return TRUE;
 
       pai = gpai; // Bottom of the list.
 
       do
       {
          if (pai->pti2 == pti)
          {
             ptiFrom = pai->pti1;
             ptiTo = pti;
             break;
          }
          if (pai->pti1 == pti)
          {
             ptiFrom = pti;
             ptiTo = pai->pti2;
             break;
          }
          pai = pai->paiNext;
 
       } while (pai);
 
       if (!pai && !ptiFrom && !ptiTo) break;
 
       Status = UserAttachThreadInput(ptiFrom, ptiTo, FALSE);
       if (!NT_SUCCESS(Status)) Ret = FALSE;
 
    } while (Ret);
 
    return Ret;
}
 
// Win: zzzAttachThreadInput
NTSTATUS FASTCALL
UserAttachThreadInput(PTHREADINFO ptiFrom, PTHREADINFO ptiTo, BOOL fAttach)
{
    MSG msg;
    PATTACHINFO pai;
    PCURICON_OBJECT CurIcon;
 
    /* Can not be the same thread. */
    if (ptiFrom == ptiTo) return STATUS_INVALID_PARAMETER;
 
    /* Do not attach to system threads or between different desktops. */
    if (ptiFrom->TIF_flags & TIF_DONTATTACHQUEUE ||
        ptiTo->TIF_flags & TIF_DONTATTACHQUEUE ||
        ptiFrom->rpdesk != ptiTo->rpdesk)
        return STATUS_ACCESS_DENIED;
 
    /* MSDN Note:
       Keyboard and mouse events received by both threads are processed by the thread specified by the idAttachTo.
     */
 
    /* If Attach set, allocate and link. */
    if (fAttach)
    {
        pai = ExAllocatePoolWithTag(PagedPool, sizeof(ATTACHINFO), USERTAG_ATTACHINFO);
        if (!pai) return STATUS_NO_MEMORY;
 
        pai->paiNext = gpai;
        pai->pti1 = ptiFrom;
        pai->pti2 = ptiTo;
        gpai = pai;
        paiCount++;
        ERR("Attach Allocated! ptiFrom 0x%p  ptiTo 0x%p paiCount %d\n",ptiFrom,ptiTo,paiCount);
 
        if (ptiTo->MessageQueue != ptiFrom->MessageQueue)
        {
 
           ptiTo->MessageQueue->iCursorLevel -= ptiFrom->iCursorLevel;
 
           if (ptiFrom->MessageQueue == gpqForeground)
           {
              ERR("ptiFrom is Foreground\n");
              ptiTo->MessageQueue->spwndActive  = ptiFrom->MessageQueue->spwndActive;
              ptiTo->MessageQueue->spwndFocus   = ptiFrom->MessageQueue->spwndFocus;
              ptiTo->MessageQueue->spwndCapture = ptiFrom->MessageQueue->spwndCapture;
              ptiTo->MessageQueue->QF_flags    ^= ((ptiTo->MessageQueue->QF_flags ^ ptiFrom->MessageQueue->QF_flags) & QF_CAPTURELOCKED);
              RtlCopyMemory(&ptiTo->MessageQueue->CaretInfo,
                            &ptiFrom->MessageQueue->CaretInfo,
                            sizeof(ptiTo->MessageQueue->CaretInfo));
              IntSetFocusMessageQueue(NULL);
              IntSetFocusMessageQueue(ptiTo->MessageQueue);
              gptiForeground = ptiTo;
           }
           else
           {
              ERR("ptiFrom NOT Foreground\n");
              if ( ptiTo->MessageQueue->spwndActive == 0 )
                  ptiTo->MessageQueue->spwndActive = ptiFrom->MessageQueue->spwndActive;
              if ( ptiTo->MessageQueue->spwndFocus == 0 )
                  ptiTo->MessageQueue->spwndFocus  = ptiFrom->MessageQueue->spwndFocus;
           }
 
           CurIcon = ptiFrom->MessageQueue->CursorObject;
 
           MsqDestroyMessageQueue(ptiFrom);
 
           if (CurIcon)
           {
              // Could be global. Keep it above the water line!
              UserReferenceObject(CurIcon);
           }
 
           if (CurIcon && UserObjectInDestroy(UserHMGetHandle(CurIcon)))
           {
              UserDereferenceObject(CurIcon);
              CurIcon = NULL;
           }
 
           ptiFrom->MessageQueue = ptiTo->MessageQueue;
 
           // Pass cursor From if To is null. Pass test_SetCursor parent_id == current pti ID.
           if (CurIcon && ptiTo->MessageQueue->CursorObject == NULL)
           {
              ERR("ptiTo receiving ptiFrom Cursor\n");
              ptiTo->MessageQueue->CursorObject = CurIcon;
           }
 
           ptiFrom->MessageQueue->cThreads++;
           ERR("ptiTo S Share count %u\n", ptiFrom->MessageQueue->cThreads);
 
           IntReferenceMessageQueue(ptiTo->MessageQueue);
        }
        else
        {
           ERR("Attach Threads are already associated!\n");
        }
    }
    else /* If clear, unlink and free it. */
    {
        BOOL Hit = FALSE;
        PATTACHINFO *ppai;
 
        if (!gpai) return STATUS_INVALID_PARAMETER;
 
        /* Search list and free if found or return false. */
        ppai = &gpai;
        while (*ppai != NULL)
        {
           if ( (*ppai)->pti2 == ptiTo && (*ppai)->pti1 == ptiFrom )
           {
              pai = *ppai;
              /* Remove it from the list */
              *ppai = (*ppai)->paiNext;
              ExFreePoolWithTag(pai, USERTAG_ATTACHINFO);
              paiCount--;
              Hit = TRUE;
              break;
           }
           ppai = &((*ppai)->paiNext);
        }
 
        if (!Hit) return STATUS_INVALID_PARAMETER;
 
        ERR("Attach Free! ptiFrom 0x%p  ptiTo 0x%p paiCount %d\n",ptiFrom,ptiTo,paiCount);
 
        if (ptiTo->MessageQueue == ptiFrom->MessageQueue)
        {
           PWND spwndActive = ptiTo->MessageQueue->spwndActive;
           PWND spwndFocus  = ptiTo->MessageQueue->spwndFocus;
 
           if (gptiForeground == ptiFrom)
           {
              ERR("ptiTo is now pti FG.\n");
              // MessageQueue foreground is set so switch threads.
              gptiForeground = ptiTo;
           }
           ptiTo->MessageQueue->cThreads--;
           ERR("ptiTo E Share count %u\n", ptiTo->MessageQueue->cThreads);
           ASSERT(ptiTo->MessageQueue->cThreads >= 1);
 
           IntDereferenceMessageQueue(ptiTo->MessageQueue);
 
           ptiFrom->MessageQueue = MsqCreateMessageQueue(ptiFrom);
 
           if (spwndActive)
           {
              if (spwndActive->head.pti == ptiFrom)
              {
                 ptiFrom->MessageQueue->spwndActive = spwndActive;
                 ptiTo->MessageQueue->spwndActive = 0;
              }
           }
           if (spwndFocus)
           {
              if (spwndFocus->head.pti == ptiFrom)
              {
                 ptiFrom->MessageQueue->spwndFocus = spwndFocus;
                 ptiTo->MessageQueue->spwndFocus = 0;
              }
           }
           ptiTo->MessageQueue->iCursorLevel -= ptiFrom->iCursorLevel;
        }
        else
        {
           ERR("Detaching Threads are not associated!\n");
        }
    }
    /* Note that key state, which can be ascertained by calls to the GetKeyState
       or GetKeyboardState function, is reset after a call to AttachThreadInput.
       ATM which one?
     */
    RtlCopyMemory(ptiTo->MessageQueue->afKeyState, gafAsyncKeyState, sizeof(gafAsyncKeyState));
 
    ptiTo->MessageQueue->msgDblClk.message = 0;
 
    /* Generate mouse move message */
    msg.message = WM_MOUSEMOVE;
    msg.wParam = UserGetMouseButtonsState();
    msg.lParam = MAKELPARAM(gpsi->ptCursor.x, gpsi->ptCursor.y);
    msg.pt = gpsi->ptCursor;
    co_MsqInsertMouseMessage(&msg, 0, 0, TRUE);
 
    return STATUS_SUCCESS;
}
 
BOOL
APIENTRY
NtUserAttachThreadInput(
    IN DWORD idAttach,
    IN DWORD idAttachTo,
    IN BOOL fAttach)
{
  NTSTATUS Status;
  PTHREADINFO pti, ptiTo;
  BOOL Ret = FALSE;
 
  UserEnterExclusive();
  TRACE("Enter NtUserAttachThreadInput %s\n",(fAttach ? "TRUE" : "FALSE" ));
 
  pti = IntTID2PTI(UlongToHandle(idAttach));
  ptiTo = IntTID2PTI(UlongToHandle(idAttachTo));
 
  if ( !pti || !ptiTo )
  {
     TRACE("AttachThreadInput pti or ptiTo NULL.\n");
     EngSetLastError(ERROR_INVALID_PARAMETER);
     goto Exit;
  }
 
  Status = UserAttachThreadInput( pti, ptiTo, fAttach);
  if (!NT_SUCCESS(Status))
  {
     TRACE("AttachThreadInput Error Status 0x%x. \n",Status);
     EngSetLastError(RtlNtStatusToDosError(Status));
  }
  else Ret = TRUE;
 
Exit:
  TRACE("Leave NtUserAttachThreadInput, ret=%d\n",Ret);
  UserLeave();
  return Ret;
}
 
/*
 * NtUserSendInput
 *
 * Generates input events from software
 */
UINT
APIENTRY
NtUserSendInput(
    UINT nInputs,
    LPINPUT pInput,
    INT cbSize)
{
    PTHREADINFO pti;
    UINT uRet = 0;
 
    TRACE("Enter NtUserSendInput\n");
    UserEnterExclusive();
 
    pti = PsGetCurrentThreadWin32Thread();
    ASSERT(pti);
 
    if (!pti->rpdesk)
    {
        goto cleanup;
    }
 
    if (!nInputs || !pInput || cbSize != sizeof(INPUT))
    {
        EngSetLastError(ERROR_INVALID_PARAMETER);
        goto cleanup;
    }
 
    /*
     * FIXME: Check access rights of the window station
     *        e.g. services running in the service window station cannot block input
     */
    if (!ThreadHasInputAccess(pti) ||
        !IntIsActiveDesktop(pti->rpdesk))
    {
        EngSetLastError(ERROR_ACCESS_DENIED);
        goto cleanup;
    }
 
    while (nInputs--)
    {
        INPUT SafeInput;
        NTSTATUS Status;
 
        Status = MmCopyFromCaller(&SafeInput, pInput++, sizeof(INPUT));
        if (!NT_SUCCESS(Status))
        {
            SetLastNtError(Status);
            goto cleanup;
        }
 
        switch (SafeInput.type)
        {
            case INPUT_MOUSE:
                if (UserSendMouseInput(&SafeInput.mi, TRUE))
                    uRet++;
                break;
            case INPUT_KEYBOARD:
                if (UserSendKeyboardInput(&SafeInput.ki, TRUE))
                    uRet++;
                break;
            case INPUT_HARDWARE:
                FIXME("INPUT_HARDWARE not supported!\n");
                break;
            default:
                ERR("SendInput(): Invalid input type: 0x%x\n", SafeInput.type);
                break;
        }
    }
 
cleanup:
    TRACE("Leave NtUserSendInput, ret=%u\n", uRet);
    UserLeave();
    return uRet;
}
 
/* EOF */