You're right -- the general rule is that ints and ptrs shouldn't be interchanged. However -- In this case, it's likely the number of integers required (control

You're right -- the general rule is that ints and ptrs shouldn't be interchanged. However -- In this case, it's likely the number of integers required (controller ids, which I guess might be 1 to 4?) would fit in almost any ptr you can think of. Conversions aren't guaranteed, but if you copy/pack it yourself there shouldn't be a problem -- e.g. do a memcpy of one byte. More likely the author was pointing at the fact that this value was later 'free'd' by the event loop. Which is fairly nasty.