NtRegisterThreadTerminatePort - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTPSAPI_H
//
// Threads
//
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * Registers a thread termination port.
 *
 * \param PortHandle A handle to the port to be registered.
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtRegisterThreadTerminatePort(
    _In_ HANDLE PortHandle
    );

#endif
#endif

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#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwRegisterThreadTerminatePort(
    _In_ HANDLE PortHandle
    );

#endif

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NTinternals.net (undocumented.ntinternals.net)

PortHandle

HANDLE to previously connected Port Object.

Typically, NtRegisterThreadTerminatePort is used in CsrNewThread function, called before thread execution begins, but in thread context.

Function associate PortHandle with thread, and sends LPC_TERMINATION_MESSAGE to specified port immediately after call NtTerminateThread.

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