private static void SetNewProcessParent(ref STARTUPINFOEX startupInfoEx, int parentProcessId)
{
const int PROC_THREAD_ATTRIBUTE_PARENT_PROCESS = 0x00020000;
IntPtr handle = WinAPI.OpenProcess(ProcessAccessFlags.CreateProcess | ProcessAccessFlags.DuplicateHandle, false, parentProcessId);
IntPtr lpValue = Marshal.AllocHGlobal(IntPtr.Size);
Marshal.WriteIntPtr(lpValue, handle);
bool success = UpdateProcThreadAttribute(startupInfoEx.lpAttributeList, 0, (IntPtr)PROC_THREAD_ATTRIBUTE_PARENT_PROCESS, lpValue,
(IntPtr)IntPtr.Size, IntPtr.Zero, IntPtr.Zero);
if (!success)
{
throw new Exception(string.Format($"Error setting [{parentProcessId}] as the parent PID for the new process"));
}
}