NtCancelTimer2 - NtDoc

#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#if (PHNT_VERSION >= PHNT_THRESHOLD)

NTSYSCALLAPI
NTSTATUS
NTAPI
NtCancelTimer2(
    _In_ HANDLE TimerHandle,
    _In_ PT2_CANCEL_PARAMETERS Parameters
    );

#endif
#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwCancelTimer2(
    _In_ HANDLE TimerHandle,
    _In_ PT2_CANCEL_PARAMETERS Parameters
    );

#endif
View code on GitHub