IoCallDriver in ReactOS

IoCallDriver in ReactOS

 

 

NTSTATUS NTAPI IoCallDriver(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {            /* Call fastcall */            return IofCallDriver(DeviceObject, Irp); }   NTSTATUS FASTCALL IofCallDriver(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {            PDRIVER_OBJECT DriverObject;            PIO_STACK_LOCATION StackPtr;              /* Get the Driver Object */            DriverObject = DeviceObject->DriverObject;              /* Decrease the current location and check if */            Irp->CurrentLocation--;            if ( Irp->CurrentLocation <= 0 )            {                      /* This IRP ran out of stack, bugcheck */                      KeBugCheckEx(NO_MORE_IRP_STACK_LOCATIONS, (ULONG_PTR)Irp, 0, 0, 0);            }              /* Now update the stack location */            StackPtr = IoGetNextIrpStackLocation(Irp);            Irp->Tail.Overlay.CurrentStackLocation = StackPtr;              /* Get the Device Object */            StackPtr->DeviceObject = DeviceObject;              /* Call it */            return DriverObject->MajorFunction[StackPtr->MajorFunction](DeviceObject,   Irp); }