computer shuts down on os.pullEventRaw() override

--processManager.lua

pullEventRaw_Backup = os.pullEventRaw

local function _init_()
	if not _PM_RUN_STATUS then
		print('loading api')
		_PM_RUN_STATUS=1
		--define coroutines
		co_func = coroutine.create(func)
		return
	end
end

local function func()
	print('func is running')
	local received = {}
	for i=1,#interface.tInterfaceWrap do
		local event = {os.pullEventRaw()}
		if event and event[2] == "modem_message" and event[6] then
			table.insert(received,event[6])
		end
	end
	return received
end

function _G.os.pullEventRaw(sFilter)
	print('os.pullEventRaw is called')
  while true do
	local event = {pullEventRaw_Backup()}
	print('event pulled')
	if coroutine.status(co_func) == "suspended" then
		print('resuming coroutine')
	  coroutine.resume(co_func, table.unpack(event))
	end
	if sFilter == event[1] or not sFilter then
	  return table.unpack(event)
	end
  end
end

_init_()

--processManager.lua

function _init_()
	if not _PM_RUN_STATUS then
		_PM_RUN_STATUS=1
		return
	end
end

function func()
	while true do
		local received
		for i=1,#interface.tInterfaceWrap do
			local event = {os.pullEventRaw()}
			if event and event[2] == "modem_message" and event[4] == interface.channel and interface.tInterfaceState[event[3]] == 'up' and event[6] then
				table.insert(received,event[6])
			end
		end
		coroutine.yield(received)
	end
end

local pullEventRaw_Backup = os.pullEventRaw
local co_func = coroutine.create(func)

function os.pullEventRaw(sFilter)
  while true do
	local event = {pullEventRaw_Backup()}
	if coroutine.status(co_func) == "suspended" then
	  coroutine.resume(co_func, table.unpack(event))
	end
	--Return any events
	if sFilter == event[1] or not sFilter then
	  return table.unpack(event)
	end
  end
end

_init_()

• _G.pullEventRaw_Backup is set to the first return value of an os.pullEventRaw call, there's no way it'll be a function you can call later in _G.os.pullEventRaw
• _init_ is global
• co_func is local and thus the coroutine created from func can never be referenced again, although you try to reference it in _G.os.pullEventRaw
• func is global
• received is local to the for loop inside func and thus func always returns nothing

LBPHacker, on 31 December 2015 - 09:09 PM said:

I'm assuming that you know how to handle coroutines. Here are some things that make this piece of code weird and non-working:

• _G.pullEventRaw_Backup is set to the first return value of an os.pullEventRaw call, there's no way it'll be a function you can call later in _G.os.pullEventRaw
• _init_ is global
• co_func is local and thus the coroutine created from func can never be referenced again, although you try to reference it in _G.os.pullEventRaw
• func is global
• received is local to the for loop inside func and thus func always returns nothing

Also, I have no idea what the table interface and the variable _PM_RUN_STATUS do. The way this code is now, I can't figure out what you're trying to achieve and can't really help.