#ifndef _NTOBAPI_H
//
// Objects, handles
//
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * The NtWaitForSingleObject routine waits until the specified object is in the signaled state or the time-out interval elapses.
 *
 * @param Handle The handle to the wait object.
 * @param Alertable The function returns when either the time-out period has elapsed or when the APC function is called.
 * @param Timeout A pointer to an absolute or relative time over which the wait is to occur. Can be null. If a timeout is specified,
 * and the object has not attained a state of signaled when the timeout expires, then the wait is automatically satisfied.
 * If an explicit timeout value of zero is specified, then no wait occurs if the wait cannot be satisfied immediately.
 * @return NTSTATUS Successful or errant status.
 * @sa https://learn.microsoft.com/en-us/windows/win32/api/winternl/nf-winternl-ntwaitforsingleobject
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtWaitForSingleObject(
    _In_ HANDLE Handle,
    _In_ BOOLEAN Alertable,
    _In_opt_ PLARGE_INTEGER Timeout
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwWaitForSingleObject(
    _In_ HANDLE Handle,
    _In_ BOOLEAN Alertable,
    _In_opt_ PLARGE_INTEGER Timeout
    );

#endif
View code on GitHub