#ifndef _NTLPCAPI_H

/**
 * The NtReplyWaitReceivePort routine sends a reply and waits for a new message.
 *
 * \param PortHandle Handle to the port object.
 * \param PortContext Optional receives the context associated with the port.
 * \param ReplyMessage Optional pointer to the reply message.
 * \return NTSTATUS Successful or errant status.
 */
_Kernel_entry_
NTSYSCALLAPI
NTSTATUS
NTAPI
NtReplyWaitReceivePort(
    _In_ HANDLE PortHandle,
    _Out_opt_ PVOID *PortContext,
    _In_reads_bytes_opt_(ReplyMessage->u1.s1.TotalLength) PPORT_MESSAGE ReplyMessage,
    _Out_ PPORT_MESSAGE ReceiveMessage
    );

#endif
View code on GitHub

#ifndef _NTZWAPI_H

_Kernel_entry_
NTSYSCALLAPI
NTSTATUS
NTAPI
ZwReplyWaitReceivePort(
    _In_ HANDLE PortHandle,
    _Out_opt_ PVOID *PortContext,
    _In_reads_bytes_opt_(ReplyMessage->u1.s1.TotalLength) PPORT_MESSAGE ReplyMessage,
    _Out_ PPORT_MESSAGE ReceiveMessage
    );

#endif
View code on GitHub