For Factor, integers are either fixnum or bignum size. For C, you tell it how many bytes it occupies according to the C header. Generally the sizes are the same across platforms. If they aren't, you might need two different STRUCT: declarations like in basis/unix/stat/linux/32/32.factor and basis/unix/stat/linux/64/64.factor.
The main point -- function signatures and struct declarations usually handle the integer sizes and you shouldn't have to think much about it. Do you have a specific example?
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