#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#if (PHNT_VERSION >= PHNT_WINDOWS_8)

/**
 * The NtSetIRTimer routine sets an IR timer object.
 *
 * \param TimerHandle A handle to the IR timer object.
 * \param DueTime An optional pointer to a LARGE_INTEGER that specifies the time at which the timer is to be set to the signaled state.
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtSetIRTimer(
    _In_ HANDLE TimerHandle,
    _In_opt_ PLARGE_INTEGER DueTime
    );

#endif
#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwSetIRTimer(
    _In_ HANDLE TimerHandle,
    _In_opt_ PLARGE_INTEGER DueTime
    );

#endif
View code on GitHub