Function setsockopt

pub extern "C" fn setsockopt(
    fn_ptr: Option<&extern "C" fn(c_int, c_int, c_int, *const c_void, socklen_t) -> c_int>,
    socket: c_int,
    level: c_int,
    name: c_int,
    value: *const c_void,
    option_len: socklen_t,
) -> c_int