override

local function run(mainFunc, errFunc)
    if type(mainFunc) ~= "function" then
        error("Nothing to run", 2)
    end

    local oldOsShutdown, oldCoroutineStatus = os.shutdown, coroutine.status

    local function clearScreen()
        term.redirect(type(term.native) == "function" and term.native() or term.native)
        term.setBackgroundColour(colours.black)
        term.setTextColour(colours.white)
        term.setCursorPos(1, 1)
        term.setCursorBlink(false)
        term.clear()
    end

    local function coroutineStatusOverride(...)
        return "dead"
    end

    local function osShutdownOverride()

        clearScreen()

        rednet.close()
        os.unloadAPI("rednet")
        os.loadAPI("/rom/apis/rednet")

        rawset(os, "shutdown", oldOsShutdown)
        rawset(coroutine, "status", oldCoroutineStatus)

        local ok, err = pcall(mainFunc)

        if not ok then
            clearScreen()
            pcall( function()
                if type(errFunc) == "function" then
                    errFunc(err)
                else
                    printError(err)
                    print("Press any key to continue")
                    os.pullEvent("key")
                end
            end )
        end

        os.shutdown()

    end

    rawset(os, "shutdown", osShutdownOverride)
    rawset(coroutine, "status", coroutineStatusOverride)

end