NtRequestWaitReplyPort - NtDoc

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

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

#endif

View code on GitHub
#ifndef _NTZWAPI_H

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

#endif

View code on GitHub

NtRequestWaitReplyPort is used typically by client side in LPC connection.

PortHandle

HANDLE to Port Object.

Request

Pointer to LPC_MESSAGE buffer contains request data.

IncomingReply

Pointer to LPC_MESSAGE buffer filled on return with reply from other side.

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See also

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