#ifndef _NTLPCAPI_H

/**
 * The NtReplyPort routine sends a reply to a previously received request.
 *
 * \param PortHandle Handle to the port object.
 * \param ReplyMessage Pointer to the reply message.
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtReplyPort(
    _In_ HANDLE PortHandle,
    _In_reads_bytes_(ReplyMessage->u1.s1.TotalLength) PPORT_MESSAGE ReplyMessage
    );

#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwReplyPort(
    _In_ HANDLE PortHandle,
    _In_reads_bytes_(ReplyMessage->u1.s1.TotalLength) PPORT_MESSAGE ReplyMessage
    );

#endif
View code on GitHub