NtAlpcSendWaitReceivePort - NtDoc

#ifndef _NTLPCAPI_H
// begin_private
#if (PHNT_VERSION >= PHNT_VISTA)

NTSYSCALLAPI
NTSTATUS
NTAPI
NtAlpcSendWaitReceivePort(
    _In_ HANDLE PortHandle,
    _In_ ULONG Flags,
    _In_reads_bytes_opt_(SendMessage->u1.s1.TotalLength) PPORT_MESSAGE SendMessage,
    _Inout_opt_ PALPC_MESSAGE_ATTRIBUTES SendMessageAttributes,
    _Out_writes_bytes_to_opt_(*BufferLength, *BufferLength) PPORT_MESSAGE ReceiveMessage,
    _Inout_opt_ PSIZE_T BufferLength,
    _Inout_opt_ PALPC_MESSAGE_ATTRIBUTES ReceiveMessageAttributes,
    _In_opt_ PLARGE_INTEGER Timeout
    );

#endif
// end_private
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwAlpcSendWaitReceivePort(
    _In_ HANDLE PortHandle,
    _In_ ULONG Flags,
    _In_reads_bytes_opt_(SendMessage->u1.s1.TotalLength) PPORT_MESSAGE SendMessage,
    _Inout_opt_ PALPC_MESSAGE_ATTRIBUTES SendMessageAttributes,
    _Out_writes_bytes_to_opt_(*BufferLength, *BufferLength) PPORT_MESSAGE ReceiveMessage,
    _Inout_opt_ PSIZE_T BufferLength,
    _Inout_opt_ PALPC_MESSAGE_ATTRIBUTES ReceiveMessageAttributes,
    _In_opt_ PLARGE_INTEGER Timeout
    );

#endif
View code on GitHub