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c_ulong
source link: https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html
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pub type c_ulong = u64;Equivalent to C’s unsigned long type.
This type will always be u32 or u64. Most notably, many Linux-based systems assume an u64, but Windows assumes u32. The C standard technically only requires that this type be an unsigned integer with the size of a long, although in practice, no system would have a ulong that is neither a u32 nor u64.
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