NtAlpcConnectPortEx - NtDoc

#ifndef _NTLPCAPI_H
// begin_private
#if (PHNT_VERSION >= PHNT_VISTA)
#if (PHNT_VERSION >= PHNT_WIN8)

NTSYSCALLAPI
NTSTATUS
NTAPI
NtAlpcConnectPortEx(
    _Out_ PHANDLE PortHandle,
    _In_ POBJECT_ATTRIBUTES ConnectionPortObjectAttributes,
    _In_opt_ POBJECT_ATTRIBUTES ClientPortObjectAttributes,
    _In_opt_ PALPC_PORT_ATTRIBUTES PortAttributes,
    _In_ ULONG Flags,
    _In_opt_ PSECURITY_DESCRIPTOR ServerSecurityRequirements,
    _Inout_updates_bytes_to_opt_(*BufferLength, *BufferLength) PPORT_MESSAGE ConnectionMessage,
    _Inout_opt_ PSIZE_T BufferLength,
    _Inout_opt_ PALPC_MESSAGE_ATTRIBUTES OutMessageAttributes,
    _Inout_opt_ PALPC_MESSAGE_ATTRIBUTES InMessageAttributes,
    _In_opt_ PLARGE_INTEGER Timeout
    );

#endif
#endif
// end_private
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwAlpcConnectPortEx(
    _Out_ PHANDLE PortHandle,
    _In_ POBJECT_ATTRIBUTES ConnectionPortObjectAttributes,
    _In_opt_ POBJECT_ATTRIBUTES ClientPortObjectAttributes,
    _In_opt_ PALPC_PORT_ATTRIBUTES PortAttributes,
    _In_ ULONG Flags,
    _In_opt_ PSECURITY_DESCRIPTOR ServerSecurityRequirements,
    _Inout_updates_bytes_to_opt_(*BufferLength, *BufferLength) PPORT_MESSAGE ConnectionMessage,
    _Inout_opt_ PSIZE_T BufferLength,
    _Inout_opt_ PALPC_MESSAGE_ATTRIBUTES OutMessageAttributes,
    _Inout_opt_ PALPC_MESSAGE_ATTRIBUTES InMessageAttributes,
    _In_opt_ PLARGE_INTEGER Timeout
    );

#endif
View code on GitHub