NtListenPort - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTLPCAPI_H

//
// Port connection (server)
//

NTSYSCALLAPI
NTSTATUS
NTAPI
NtListenPort(
    _In_ HANDLE PortHandle,
    _Out_ PPORT_MESSAGE ConnectionRequest
    );

#endif

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#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwListenPort(
    _In_ HANDLE PortHandle,
    _Out_ PPORT_MESSAGE ConnectionRequest
    );

#endif

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NTinternals.net (undocumented.ntinternals.net)

NtListenPort is used by LPC server.

PortHandle

HANDLE to named Port Object, created with NtCreatePort.

ConnectionRequest

Result of call - pointer to structure LPC_MESSAGE filled with incoming connection data.

Server process should create new thread starting from execution of NtAcceptConnectPort. Main thread should call NtListenPort again to make possible for other processes to connect to port.

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