IoGetFunctionCodeFromCtlCode - NtDoc
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// wdm.h
void IoGetFunctionCodeFromCtlCode(
[in] ControlCode
);
View the official Windows Driver Kit DDI referenceNo description available.
The IoGetFunctionCodeFromCtlCode macro returns the value of the function code contained in an I/O control code.
ControlCode [in]The IOCTL_XXX (or FSCTL_XXX) value, which can be obtained from the driver's I/O stack location of the IRP at Parameters.DeviceIoControl.IoControlCode.
IoGetFunctionCodeFromCtlCode returns the value of the Function part of the given IOCTL_XXX code.
For information about the layout of IOCTL codes, see Using I/O Control Codes.