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return {
getfenv = getfenv or function(f)
f = (type(f) == 'function' and f or debug.getinfo(f + 1, 'f').func)
local name, value
local up = 0
repeat
up = up + 1
name, value = debug.getupvalue(f, up)
until name == '_ENV' or name == nil
return value
end,
setfenv = setfenv or function(f, t)
f = (type(f) == 'function' and f or debug.getinfo(f + 1, 'f').func)
local name
local up = 0
repeat
up = up + 1
name = debug.getupvalue(f, up)
until name == '_ENV' or name == nil
if name then
debug.upvaluejoin(f, up, function() return name end, 1)
debug.setupvalue(f, up, t)
end
if f ~= 0 then return f end
end,
unpack = table.unpack or unpack,
osexit = function(code, close)
if close and _VERSION == 'Lua 5.1' then
-- From Lua 5.1 manual:
-- > The userdata itself is freed only in the next
-- > garbage-collection cycle.
-- Call collectgarbage() while collectgarbage('count')
-- changes + 3 times, at least 3 times,
-- at max 100 times (to prevent infinite loop).
local times_const = 0
for i = 1, 100 do
local count_before = collectgarbage("count")
collectgarbage()
local count_after = collectgarbage("count")
if count_after == count_before then
times_const = times_const + 1
if times_const > 3 then
break
end
else
times_const = 0
end
end
end
os.exit(code, close)
end,
}
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