STARTUPINFO, PROCESS_INFORMATION, SECURITY_ATTRIBUTES, STARTUPINFOEX

Replace STARTUPINFO with STARTUPINFOEX to use UpdateProcThreadAttribute and extend CreateProcess. Make sure you include the flag EXTENDED_STARTUPINFO_PRESENT (0x00080000)

Save the attribute list to the STARTUPINFOEX struct, use UpdateProcThreadAttribute to fill in the now-reserved attribute entries.

        startupInfoEx.lpAttributeList = InitializeProcThreadAttributeList(attributeCount);

    and [STARTUPINFOEX]

Call InitializeProcThreadAttributeList before adding attributes. Save the result to a STARTUPINFOEX struct.

private static void SetNewProcessParent(ref STARTUPINFOEX startupInfoEx, int parentProcessId)

        startupInfoEx.lpAttributeList,

    private static void SetInheritableHandles(ref STARTUPINFOEX startupInfoEx, ICollection<IntPtr> inheritableHandles)

        startupInfoEx.lpAttributeList,

public struct STARTUPINFOEX

Structure STARTUPINFOEX

        startupInfoEx.StartupInfo.cb = Marshal.SizeOf(startupInfoEx);

public struct STARTUPINFOEX

Structure STARTUPINFOEX

        startupInfoEx.StartupInfo.cb = Marshal.SizeOf(startupInfoEx);