The windows handle pass to and get from master process

duplicate_handle.cpp

extern DWORD g_masterProcessId;

HANDLE DuplicateHandleToMaster( HANDLE handle )
{
    HANDLE master_handle = NULL;
    HANDLE master_process = OpenProcess(
        PROCESS_DUP_HANDLE, FALSE, g_masterProcessId
    );

    if( ! master_process ) return NULL;

    BOOL hr = DuplicateHandle(
        GetCurrentProcess(), handle,
        master_process, &master_handle,
        0, FALSE, DUPLICATE_SAME_ACCESS
    );

    if( ! hr ) {
        CloseHandle( master_process );
        return NULL;
    }

    return master_handle;
}


HANDLE DuplicateHandleFromMaster( HANDLE handle )
{
    HANDLE local_handle = NULL;
    HANDLE master_process = OpenProcess(
        PROCESS_DUP_HANDLE, FALSE, g_masterProcessId
    );

    if( ! master_process ) return NULL;

    BOOL hr = DuplicateHandle(
        master_process, handle,
        GetCurrentProcess(), &local_handle,
        0, FALSE, DUPLICATE_SAME_ACCESS
    );

    if( ! hr ) {
        CloseHandle( master_process );
        return NULL;
    }

    return local_handle;
}