c_ulong in std::ffi - Rust
Description: Equivalent to C’s `unsigned long` type.

# Type Definition std::ffi::c_ulong

1.64.0 · source ·

    pub type c_ulong = u32;

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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`.