Method fileno

crates/stdlib/src/socket.rs:2187–2192

(&self)

        #[pymethod]
        fn fileno(&self) -> i64 {
            self.sock
                .read()
                .as_ref()
                .map_or(INVALID_SOCKET as i64, |s| sock_fileno(s) as i64)
        }

        #[pymethod]
        fn getsockname(&self, vm: &VirtualMachine) -> std::io::Result<PyObjectRef> {