#!/opt/lnxall_app/bin/lua

local invoker = require "invoker"
local module = {}

local ZOMBIE_RECHECK_DELAY_MS = 8000

function module.checkplat()
	return true
end

function module.category()
	return "进程状态"
end

function module.description()
	return "检查僵尸进程"
end

function module.detailed()
	return "扫描系统进程状态, 查找仍然存在的僵尸进程, 用于判断业务或系统服务是否存在进程回收异常."
end

function module.suggestion()
	return "请反馈给应用开发"
end

function module.step()
	local pids = invoker.glob("/proc/*")
	if not pids then
		return { error = "failed to scan /proc" }, true
	end

	local zombies = {}
	for _, pid in ipairs(pids) do
		if invoker.statfile(pid) == "directory" then
			local st = invoker.readfile(string.format("%s/status", pid))
			if st and string.find(st, "zombie", 1, true) then
				local zname = invoker.readfile(string.format("%s/comm", pid),
					invoker.TRIMEND)
				zombies[#zombies + 1] = {
					pid = pid:sub(7),
					name = zname or "unknown",
				}
			end
		end
	end

	if #zombies > 0 then
		local disappeared = 0
		invoker.msleep(ZOMBIE_RECHECK_DELAY_MS)
		for _, zombie in ipairs(zombies) do
			if not invoker.statfile(string.format("/proc/%s/status", zombie.pid)) then
				disappeared = disappeared + 1
				zombie.valid = false
			end
		end
		if disappeared == #zombies then
			return {}, false
		end

		return zombies, true
	end

	return {}, false
end

return module