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>
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. use std::cell::RefCell; use std::fmt; use std::io; use std::net::{ToSocketAddrs, UdpSocket}; use IntoInner; use socket::Socket; use sys::c; /// An "in progress" UDP socket which has not yet been connected. /// /// Allows configuration of a socket before the socket is connected. pub struct UdpBuilder { socket: RefCell<Option<Socket>>, } impl UdpBuilder { /// Constructs a new UdpBuilder with the `AF_INET` domain, the `SOCK_DGRAM` /// type, and with a protocol argument of 0. /// /// Note that passing other kinds of flags or arguments can be done through /// the `FromRaw{Fd,Socket}` implementation. pub fn new_v4() -> io::Result<UdpBuilder> { Socket::new(c::AF_INET, c::SOCK_DGRAM).map(::FromInner::from_inner) } /// Constructs a new UdpBuilder with the `AF_INET6` domain, the `SOCK_DGRAM` /// type, and with a protocol argument of 0. /// /// Note that passing other kinds of flags or arguments can be done through /// the `FromRaw{Fd,Socket}` implementation. pub fn new_v6() -> io::Result<UdpBuilder> { Socket::new(c::AF_INET6, c::SOCK_DGRAM).map(::FromInner::from_inner) } /// Binds this socket to the specified address. /// /// This function directly corresponds to the bind(2) function on Windows /// and Unix. pub fn bind<T>(&self, addr: T) -> io::Result<UdpSocket> where T: ToSocketAddrs { try!(self.with_socket(|sock| { let addr = try!(::one_addr(addr)); sock.bind(&addr) })); Ok(self.socket.borrow_mut().take().unwrap().into_inner().into_udp_socket()) } fn with_socket<F>(&self, f: F) -> io::Result<()> where F: FnOnce(&Socket) -> io::Result<()> { match *self.socket.borrow() { Some(ref s) => f(s), None => Err(io::Error::new(io::ErrorKind::Other, "builder has already finished its socket")), } } } impl fmt::Debug for UdpBuilder { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "UdpBuilder {{ socket: {:?} }}", self.socket.borrow().as_ref().unwrap()) } } impl ::AsInner for UdpBuilder { type Inner = RefCell<Option<Socket>>; fn as_inner(&self) -> &RefCell<Option<Socket>> { &self.socket } } impl ::FromInner for UdpBuilder { type Inner = Socket; fn from_inner(sock: Socket) -> UdpBuilder { UdpBuilder { socket: RefCell::new(Some(sock)) } } }