类型别名 _onexit_t 

pub type _onexit_t = Option<unsafe extern "C" fn() -> c_int>;

别名类型

pub enum _onexit_t {
    None,
    Some(unsafe extern "C" fn() -> i32),
}

Variants

None

No value.

Some(unsafe extern "C" fn() -> i32)

Some value of type T.