KeQueryAuxiliaryCounterFrequency function (wdm.h)

The KeQueryAuxiliaryCounterFrequency routine returns frequency of the auxiliary counter in units of Hz.

Syntax

NTSTATUS KeQueryAuxiliaryCounterFrequency(
  [out, optional] PULONG64 AuxiliaryCounterFrequency
);

Parameters

[out, optional] AuxiliaryCounterFrequency

A pointer to a variable to which KeQueryAuxiliaryCounterFrequency writes the auxiliary counter frequency, in ticks per second. This parameter can be NULL.

Return value

KeQueryAuxiliaryCounterFrequency can return one of the following:

Return code	Description
STATUS_SUCCESS	The query succeeded.
STATUS_NOT_SUPPORTED	Auxiliary counter is not supported.

Remarks

Call this routine to programmatically determine whether auxiliary counter is supported. In that call, if you do not need the frequency of the counter, pass NULL. If not supported, the routine returns STATUS_NOT_SUPPORTED.

Requirements

Requirement	Value
Minimum supported client	Available starting with Windows 10.
Target Platform	Universal
Header	wdm.h
Library	Ntoskrnl.lib
DLL	Hal.dll
IRQL	Any level

See also

KeConvertAuxiliaryCounterToPerformanceCounter

KeConvertPerformanceCounterToAuxiliaryCounter