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The IoGetCurrentIrpStackLocation routine returns a pointer to the caller's I/O stack ___location in the specified IRP.
Syntax
__drv_aliasesMem PIO_STACK_LOCATION IoGetCurrentIrpStackLocation(
[in] PIRP Irp
);
Parameters
[in] Irp
A pointer to the IRP.
Return value
IoGetCurrentIrpStackLocation returns a pointer to an IO_STACK_LOCATION structure that contains the I/O stack ___location for the driver.
Remarks
Every driver must call IoGetCurrentIrpStackLocation with each IRP it is sent in order to get any parameters for the current request. Unless a driver supplies a dispatch routine for each IRP_MJ_XXX code that the driver handles, the driver also must check its I/O stack ___location in the IRP to determine what operation is being requested.
If a driver is passing the same parameters that it received to the next-lower driver, it should call IoCopyCurrentIrpStackLocationToNext or IoSkipCurrentIrpStackLocation instead of getting a pointer to the next-lower stack ___location and copying the parameters manually.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows 2000. |
| Target Platform | Desktop |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
| IRQL | Any level |