IoCopyCurrentIrpStackLocationToNext function (wdm.h)

The IoCopyCurrentIrpStackLocationToNext routine copies the IRP stack parameters from the current I/O stack ___location to the stack ___location of the next-lower driver.

Syntax

void IoCopyCurrentIrpStackLocationToNext(
  [in, out] PIRP Irp
);

Parameters

[in, out] Irp

A pointer to the IRP.

Return value

None

Remarks

A driver calls IoCopyCurrentIrpStackLocationToNext to copy the IRP parameters from its stack ___location to the next-lower driver's stack ___location.

After calling this routine, a driver typically sets an I/O completion routine with IoSetCompletionRoutine before passing the IRP to the next-lower driver with IoCallDriver. Drivers that pass on their IRP parameters but do not set an I/O completion routine should call IoSkipCurrentIrpStackLocation instead of this routine.

If your driver calls IoSkipCurrentIrpStackLocation, be careful not to modify the IO_STACK_LOCATION structure in a way that could unintentionally affect the lower driver or the system's behavior with respect to that driver. In particular, your driver should not modify the IO_STACK_LOCATION structure's Parameters union, and should not call the IoMarkIrpPending routine.

Requirements

See also

IO_STACK_LOCATION

IoCallDriver

IoMarkIrpPending

IoSetCompletionRoutine

IoSkipCurrentIrpStackLocation