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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.28.2/src/net/udp.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>udp.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../tokio/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../tokio/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::io::{Interest, PollEvented, ReadBuf, Ready};
 <span class="kw">use </span><span class="kw">crate</span>::net::{to_socket_addrs, ToSocketAddrs};

 <span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::io;
 <span class="kw">use </span>std::net::{<span class="self">self</span>, Ipv4Addr, Ipv6Addr, SocketAddr};
 <span class="kw">use </span>std::task::{Context, Poll};

 <span class="macro">cfg_io_util! </span>{
     <span class="kw">use </span>bytes::BufMut;
 }

 <span class="macro">cfg_net! </span>{
     <span class="doccomment">/// A UDP socket.
     ///
     /// UDP is &quot;connectionless&quot;, unlike TCP. Meaning, regardless of what address you&#39;ve bound to, a `UdpSocket`
     /// is free to communicate with many different remotes. In tokio there are basically two main ways to use `UdpSocket`:
     ///
     /// * one to many: [`bind`](`UdpSocket::bind`) and use [`send_to`](`UdpSocket::send_to`)
     ///   and [`recv_from`](`UdpSocket::recv_from`) to communicate with many different addresses
     /// * one to one: [`connect`](`UdpSocket::connect`) and associate with a single address, using [`send`](`UdpSocket::send`)
     ///   and [`recv`](`UdpSocket::recv`) to communicate only with that remote address
     ///
     /// This type does not provide a `split` method, because this functionality
     /// can be achieved by instead wrapping the socket in an [`Arc`]. Note that
     /// you do not need a `Mutex` to share the `UdpSocket` — an `Arc&lt;UdpSocket&gt;`
     /// is enough. This is because all of the methods take `&amp;self` instead of
     /// `&amp;mut self`. Once you have wrapped it in an `Arc`, you can call
     /// `.clone()` on the `Arc&lt;UdpSocket&gt;` to get multiple shared handles to the
     /// same socket. An example of such usage can be found further down.
     ///
     /// [`Arc`]: std::sync::Arc
     ///
     /// # Streams
     ///
     /// If you need to listen over UDP and produce a [`Stream`], you can look
     /// at [`UdpFramed`].
     ///
     /// [`UdpFramed`]: https://docs.rs/tokio-util/latest/tokio_util/udp/struct.UdpFramed.html
     /// [`Stream`]: https://docs.rs/futures/0.3/futures/stream/trait.Stream.html
     ///
     /// # Example: one to many (bind)
     ///
     /// Using `bind` we can create a simple echo server that sends and recv&#39;s with many different clients:
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     let sock = UdpSocket::bind(&quot;0.0.0.0:8080&quot;).await?;
     ///     let mut buf = [0; 1024];
     ///     loop {
     ///         let (len, addr) = sock.recv_from(&amp;mut buf).await?;
     ///         println!(&quot;{:?} bytes received from {:?}&quot;, len, addr);
     ///
     ///         let len = sock.send_to(&amp;buf[..len], addr).await?;
     ///         println!(&quot;{:?} bytes sent&quot;, len);
     ///     }
     /// }
     /// ```
     ///
     /// # Example: one to one (connect)
     ///
     /// Or using `connect` we can echo with a single remote address using `send` and `recv`:
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     let sock = UdpSocket::bind(&quot;0.0.0.0:8080&quot;).await?;
     ///
     ///     let remote_addr = &quot;127.0.0.1:59611&quot;;
     ///     sock.connect(remote_addr).await?;
     ///     let mut buf = [0; 1024];
     ///     loop {
     ///         let len = sock.recv(&amp;mut buf).await?;
     ///         println!(&quot;{:?} bytes received from {:?}&quot;, len, remote_addr);
     ///
     ///         let len = sock.send(&amp;buf[..len]).await?;
     ///         println!(&quot;{:?} bytes sent&quot;, len);
     ///     }
     /// }
     /// ```
     ///
     /// # Example: Splitting with `Arc`
     ///
     /// Because `send_to` and `recv_from` take `&amp;self`. It&#39;s perfectly alright
     /// to use an `Arc&lt;UdpSocket&gt;` and share the references to multiple tasks.
     /// Here is a similar &quot;echo&quot; example that supports concurrent
     /// sending/receiving:
     ///
     /// ```no_run
     /// use tokio::{net::UdpSocket, sync::mpsc};
     /// use std::{io, net::SocketAddr, sync::Arc};
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     let sock = UdpSocket::bind(&quot;0.0.0.0:8080&quot;.parse::&lt;SocketAddr&gt;().unwrap()).await?;
     ///     let r = Arc::new(sock);
     ///     let s = r.clone();
     ///     let (tx, mut rx) = mpsc::channel::&lt;(Vec&lt;u8&gt;, SocketAddr)&gt;(1_000);
     ///
     ///     tokio::spawn(async move {
     ///         while let Some((bytes, addr)) = rx.recv().await {
     ///             let len = s.send_to(&amp;bytes, &amp;addr).await.unwrap();
     ///             println!(&quot;{:?} bytes sent&quot;, len);
     ///         }
     ///     });
     ///
     ///     let mut buf = [0; 1024];
     ///     loop {
     ///         let (len, addr) = r.recv_from(&amp;mut buf).await?;
     ///         println!(&quot;{:?} bytes received from {:?}&quot;, len, addr);
     ///         tx.send((buf[..len].to_vec(), addr)).await.unwrap();
     ///     }
     /// }
     /// ```
     ///
     </span><span class="kw">pub struct </span>UdpSocket {
         io: PollEvented&lt;mio::net::UdpSocket&gt;,
     }
 }

 <span class="kw">impl </span>UdpSocket {
     <span class="doccomment">/// This function will create a new UDP socket and attempt to bind it to
     /// the `addr` provided.
     ///
     /// Binding with a port number of 0 will request that the OS assigns a port
     /// to this listener. The port allocated can be queried via the `local_addr`
     /// method.
     ///
     /// # Example
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     let sock = UdpSocket::bind(&quot;0.0.0.0:8080&quot;).await?;
     ///     // use `sock`
     /// #   let _ = sock;
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub async fn </span>bind&lt;A: ToSocketAddrs&gt;(addr: A) -&gt; io::Result&lt;UdpSocket&gt; {
         <span class="kw">let </span>addrs = to_socket_addrs(addr).<span class="kw">await</span><span class="question-mark">?</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>last_err = <span class="prelude-val">None</span>;

         <span class="kw">for </span>addr <span class="kw">in </span>addrs {
             <span class="kw">match </span>UdpSocket::bind_addr(addr) {
                 <span class="prelude-val">Ok</span>(socket) =&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(socket),
                 <span class="prelude-val">Err</span>(e) =&gt; last_err = <span class="prelude-val">Some</span>(e),
             }
         }

         <span class="prelude-val">Err</span>(last_err.unwrap_or_else(|| {
             io::Error::new(
                 io::ErrorKind::InvalidInput,
                 <span class="string">&quot;could not resolve to any address&quot;</span>,
             )
         }))
     }

     <span class="kw">fn </span>bind_addr(addr: SocketAddr) -&gt; io::Result&lt;UdpSocket&gt; {
         <span class="kw">let </span>sys = mio::net::UdpSocket::bind(addr)<span class="question-mark">?</span>;
         UdpSocket::new(sys)
     }

     <span class="attribute">#[track_caller]
     </span><span class="kw">fn </span>new(socket: mio::net::UdpSocket) -&gt; io::Result&lt;UdpSocket&gt; {
         <span class="kw">let </span>io = PollEvented::new(socket)<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(UdpSocket { io })
     }

     <span class="doccomment">/// Creates new `UdpSocket` from a previously bound `std::net::UdpSocket`.
     ///
     /// This function is intended to be used to wrap a UDP socket from the
     /// standard library in the Tokio equivalent.
     ///
     /// This can be used in conjunction with socket2&#39;s `Socket` interface to
     /// configure a socket before it&#39;s handed off, such as setting options like
     /// `reuse_address` or binding to multiple addresses.
     ///
     /// # Notes
     ///
     /// The caller is responsible for ensuring that the socket is in
     /// non-blocking mode. Otherwise all I/O operations on the socket
     /// will block the thread, which will cause unexpected behavior.
     /// Non-blocking mode can be set using [`set_nonblocking`].
     ///
     /// [`set_nonblocking`]: std::net::UdpSocket::set_nonblocking
     ///
     /// # Panics
     ///
     /// This function panics if thread-local runtime is not set.
     ///
     /// The runtime is usually set implicitly when this function is called
     /// from a future driven by a tokio runtime, otherwise runtime can be set
     /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function.
     ///
     /// # Example
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// # use std::{io, net::SocketAddr};
     ///
     /// # #[tokio::main]
     /// # async fn main() -&gt; io::Result&lt;()&gt; {
     /// let addr = &quot;0.0.0.0:8080&quot;.parse::&lt;SocketAddr&gt;().unwrap();
     /// let std_sock = std::net::UdpSocket::bind(addr)?;
     /// std_sock.set_nonblocking(true)?;
     /// let sock = UdpSocket::from_std(std_sock)?;
     /// // use `sock`
     /// # Ok(())
     /// # }
     /// ```
     </span><span class="attribute">#[track_caller]
     </span><span class="kw">pub fn </span>from_std(socket: net::UdpSocket) -&gt; io::Result&lt;UdpSocket&gt; {
         <span class="kw">let </span>io = mio::net::UdpSocket::from_std(socket);
         UdpSocket::new(io)
     }

     <span class="doccomment">/// Turns a [`tokio::net::UdpSocket`] into a [`std::net::UdpSocket`].
     ///
     /// The returned [`std::net::UdpSocket`] will have nonblocking mode set as
     /// `true`.  Use [`set_nonblocking`] to change the blocking mode if needed.
     ///
     /// # Examples
     ///
     /// ```rust,no_run
     /// use std::error::Error;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; Result&lt;(), Box&lt;dyn Error&gt;&gt; {
     ///     let tokio_socket = tokio::net::UdpSocket::bind(&quot;127.0.0.1:0&quot;).await?;
     ///     let std_socket = tokio_socket.into_std()?;
     ///     std_socket.set_nonblocking(false)?;
     ///     Ok(())
     /// }
     /// ```
     ///
     /// [`tokio::net::UdpSocket`]: UdpSocket
     /// [`std::net::UdpSocket`]: std::net::UdpSocket
     /// [`set_nonblocking`]: fn@std::net::UdpSocket::set_nonblocking
     </span><span class="kw">pub fn </span>into_std(<span class="self">self</span>) -&gt; io::Result&lt;std::net::UdpSocket&gt; {
         <span class="attribute">#[cfg(unix)]
         </span>{
             <span class="kw">use </span>std::os::unix::io::{FromRawFd, IntoRawFd};
             <span class="self">self</span>.io
                 .into_inner()
                 .map(|io| io.into_raw_fd())
                 .map(|raw_fd| <span class="kw">unsafe </span>{ std::net::UdpSocket::from_raw_fd(raw_fd) })
         }

         <span class="attribute">#[cfg(windows)]
         </span>{
             <span class="kw">use </span>std::os::windows::io::{FromRawSocket, IntoRawSocket};
             <span class="self">self</span>.io
                 .into_inner()
                 .map(|io| io.into_raw_socket())
                 .map(|raw_socket| <span class="kw">unsafe </span>{ std::net::UdpSocket::from_raw_socket(raw_socket) })
         }
     }

     <span class="kw">fn </span>as_socket(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; socket2::SockRef&lt;<span class="lifetime">&#39;_</span>&gt; {
         socket2::SockRef::from(<span class="self">self</span>)
     }

     <span class="doccomment">/// Returns the local address that this socket is bound to.
     ///
     /// # Example
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// # use std::{io, net::SocketAddr};
     ///
     /// # #[tokio::main]
     /// # async fn main() -&gt; io::Result&lt;()&gt; {
     /// let addr = &quot;0.0.0.0:8080&quot;.parse::&lt;SocketAddr&gt;().unwrap();
     /// let sock = UdpSocket::bind(addr).await?;
     /// // the address the socket is bound to
     /// let local_addr = sock.local_addr()?;
     /// # Ok(())
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>local_addr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;SocketAddr&gt; {
         <span class="self">self</span>.io.local_addr()
     }

     <span class="doccomment">/// Returns the socket address of the remote peer this socket was connected to.
     ///
     /// # Example
     ///
     /// ```
     /// use tokio::net::UdpSocket;
     ///
     /// # use std::{io, net::SocketAddr};
     /// # #[tokio::main]
     /// # async fn main() -&gt; io::Result&lt;()&gt; {
     /// let addr = &quot;0.0.0.0:8080&quot;.parse::&lt;SocketAddr&gt;().unwrap();
     /// let peer = &quot;127.0.0.1:11100&quot;.parse::&lt;SocketAddr&gt;().unwrap();
     /// let sock = UdpSocket::bind(addr).await?;
     /// sock.connect(peer).await?;
     /// assert_eq!(peer, sock.peer_addr()?);
     /// #    Ok(())
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>peer_addr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;SocketAddr&gt; {
         <span class="self">self</span>.io.peer_addr()
     }

     <span class="doccomment">/// Connects the UDP socket setting the default destination for send() and
     /// limiting packets that are read via recv from the address specified in
     /// `addr`.
     ///
     /// # Example
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// # use std::{io, net::SocketAddr};
     ///
     /// # #[tokio::main]
     /// # async fn main() -&gt; io::Result&lt;()&gt; {
     /// let sock = UdpSocket::bind(&quot;0.0.0.0:8080&quot;.parse::&lt;SocketAddr&gt;().unwrap()).await?;
     ///
     /// let remote_addr = &quot;127.0.0.1:59600&quot;.parse::&lt;SocketAddr&gt;().unwrap();
     /// sock.connect(remote_addr).await?;
     /// let mut buf = [0u8; 32];
     /// // recv from remote_addr
     /// let len = sock.recv(&amp;mut buf).await?;
     /// // send to remote_addr
     /// let _len = sock.send(&amp;buf[..len]).await?;
     /// # Ok(())
     /// # }
     /// ```
     </span><span class="kw">pub async fn </span>connect&lt;A: ToSocketAddrs&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, addr: A) -&gt; io::Result&lt;()&gt; {
         <span class="kw">let </span>addrs = to_socket_addrs(addr).<span class="kw">await</span><span class="question-mark">?</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>last_err = <span class="prelude-val">None</span>;

         <span class="kw">for </span>addr <span class="kw">in </span>addrs {
             <span class="kw">match </span><span class="self">self</span>.io.connect(addr) {
                 <span class="prelude-val">Ok</span>(<span class="kw">_</span>) =&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(()),
                 <span class="prelude-val">Err</span>(e) =&gt; last_err = <span class="prelude-val">Some</span>(e),
             }
         }

         <span class="prelude-val">Err</span>(last_err.unwrap_or_else(|| {
             io::Error::new(
                 io::ErrorKind::InvalidInput,
                 <span class="string">&quot;could not resolve to any address&quot;</span>,
             )
         }))
     }

     <span class="doccomment">/// Waits for any of the requested ready states.
     ///
     /// This function is usually paired with `try_recv()` or `try_send()`. It
     /// can be used to concurrently recv / send to the same socket on a single
     /// task without splitting the socket.
     ///
     /// The function may complete without the socket being ready. This is a
     /// false-positive and attempting an operation will return with
     /// `io::ErrorKind::WouldBlock`. The function can also return with an empty
     /// [`Ready`] set, so you should always check the returned value and possibly
     /// wait again if the requested states are not set.
     ///
     /// # Cancel safety
     ///
     /// This method is cancel safe. Once a readiness event occurs, the method
     /// will continue to return immediately until the readiness event is
     /// consumed by an attempt to read or write that fails with `WouldBlock` or
     /// `Poll::Pending`.
     ///
     /// # Examples
     ///
     /// Concurrently receive from and send to the socket on the same task
     /// without splitting.
     ///
     /// ```no_run
     /// use tokio::io::{self, Interest};
     /// use tokio::net::UdpSocket;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
     ///
     ///     loop {
     ///         let ready = socket.ready(Interest::READABLE | Interest::WRITABLE).await?;
     ///
     ///         if ready.is_readable() {
     ///             // The buffer is **not** included in the async task and will only exist
     ///             // on the stack.
     ///             let mut data = [0; 1024];
     ///             match socket.try_recv(&amp;mut data[..]) {
     ///                 Ok(n) =&gt; {
     ///                     println!(&quot;received {:?}&quot;, &amp;data[..n]);
     ///                 }
     ///                 // False-positive, continue
     ///                 Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {}
     ///                 Err(e) =&gt; {
     ///                     return Err(e);
     ///                 }
     ///             }
     ///         }
     ///
     ///         if ready.is_writable() {
     ///             // Write some data
     ///             match socket.try_send(b&quot;hello world&quot;) {
     ///                 Ok(n) =&gt; {
     ///                     println!(&quot;sent {} bytes&quot;, n);
     ///                 }
     ///                 // False-positive, continue
     ///                 Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {}
     ///                 Err(e) =&gt; {
     ///                     return Err(e);
     ///                 }
     ///             }
     ///         }
     ///     }
     /// }
     /// ```
     </span><span class="kw">pub async fn </span>ready(<span class="kw-2">&amp;</span><span class="self">self</span>, interest: Interest) -&gt; io::Result&lt;Ready&gt; {
         <span class="kw">let </span>event = <span class="self">self</span>.io.registration().readiness(interest).<span class="kw">await</span><span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(event.ready)
     }

     <span class="doccomment">/// Waits for the socket to become writable.
     ///
     /// This function is equivalent to `ready(Interest::WRITABLE)` and is
     /// usually paired with `try_send()` or `try_send_to()`.
     ///
     /// The function may complete without the socket being writable. This is a
     /// false-positive and attempting a `try_send()` will return with
     /// `io::ErrorKind::WouldBlock`.
     ///
     /// # Cancel safety
     ///
     /// This method is cancel safe. Once a readiness event occurs, the method
     /// will continue to return immediately until the readiness event is
     /// consumed by an attempt to write that fails with `WouldBlock` or
     /// `Poll::Pending`.
     ///
     /// # Examples
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     // Bind socket
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
     ///
     ///     loop {
     ///         // Wait for the socket to be writable
     ///         socket.writable().await?;
     ///
     ///         // Try to send data, this may still fail with `WouldBlock`
     ///         // if the readiness event is a false positive.
     ///         match socket.try_send(b&quot;hello world&quot;) {
     ///             Ok(n) =&gt; {
     ///                 break;
     ///             }
     ///             Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {
     ///                 continue;
     ///             }
     ///             Err(e) =&gt; {
     ///                 return Err(e);
     ///             }
     ///         }
     ///     }
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub async fn </span>writable(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.ready(Interest::WRITABLE).<span class="kw">await</span><span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Polls for write/send readiness.
     ///
     /// If the udp stream is not currently ready for sending, this method will
     /// store a clone of the `Waker` from the provided `Context`. When the udp
     /// stream becomes ready for sending, `Waker::wake` will be called on the
     /// waker.
     ///
     /// Note that on multiple calls to `poll_send_ready` or `poll_send`, only
     /// the `Waker` from the `Context` passed to the most recent call is
     /// scheduled to receive a wakeup. (However, `poll_recv_ready` retains a
     /// second, independent waker.)
     ///
     /// This function is intended for cases where creating and pinning a future
     /// via [`writable`] is not feasible. Where possible, using [`writable`] is
     /// preferred, as this supports polling from multiple tasks at once.
     ///
     /// # Return value
     ///
     /// The function returns:
     ///
     /// * `Poll::Pending` if the udp stream is not ready for writing.
     /// * `Poll::Ready(Ok(()))` if the udp stream is ready for writing.
     /// * `Poll::Ready(Err(e))` if an error is encountered.
     ///
     /// # Errors
     ///
     /// This function may encounter any standard I/O error except `WouldBlock`.
     ///
     /// [`writable`]: method@Self::writable
     </span><span class="kw">pub fn </span>poll_send_ready(<span class="kw-2">&amp;</span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;io::Result&lt;()&gt;&gt; {
         <span class="self">self</span>.io.registration().poll_write_ready(cx).map_ok(|<span class="kw">_</span>| ())
     }

     <span class="doccomment">/// Sends data on the socket to the remote address that the socket is
     /// connected to.
     ///
     /// The [`connect`] method will connect this socket to a remote address.
     /// This method will fail if the socket is not connected.
     ///
     /// [`connect`]: method@Self::connect
     ///
     /// # Return
     ///
     /// On success, the number of bytes sent is returned, otherwise, the
     /// encountered error is returned.
     ///
     /// # Cancel safety
     ///
     /// This method is cancel safe. If `send` is used as the event in a
     /// [`tokio::select!`](crate::select) statement and some other branch
     /// completes first, then it is guaranteed that the message was not sent.
     ///
     /// # Examples
     ///
     /// ```no_run
     /// use tokio::io;
     /// use tokio::net::UdpSocket;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     // Bind socket
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
     ///
     ///     // Send a message
     ///     socket.send(b&quot;hello world&quot;).await?;
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub async fn </span>send(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span>[u8]) -&gt; io::Result&lt;usize&gt; {
         <span class="self">self</span>.io
             .registration()
             .async_io(Interest::WRITABLE, || <span class="self">self</span>.io.send(buf))
             .<span class="kw">await
     </span>}

     <span class="doccomment">/// Attempts to send data on the socket to the remote address to which it
     /// was previously `connect`ed.
     ///
     /// The [`connect`] method will connect this socket to a remote address.
     /// This method will fail if the socket is not connected.
     ///
     /// Note that on multiple calls to a `poll_*` method in the send direction,
     /// only the `Waker` from the `Context` passed to the most recent call will
     /// be scheduled to receive a wakeup.
     ///
     /// # Return value
     ///
     /// The function returns:
     ///
     /// * `Poll::Pending` if the socket is not available to write
     /// * `Poll::Ready(Ok(n))` `n` is the number of bytes sent
     /// * `Poll::Ready(Err(e))` if an error is encountered.
     ///
     /// # Errors
     ///
     /// This function may encounter any standard I/O error except `WouldBlock`.
     ///
     /// [`connect`]: method@Self::connect
     </span><span class="kw">pub fn </span>poll_send(<span class="kw-2">&amp;</span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;, buf: <span class="kw-2">&amp;</span>[u8]) -&gt; Poll&lt;io::Result&lt;usize&gt;&gt; {
         <span class="self">self</span>.io
             .registration()
             .poll_write_io(cx, || <span class="self">self</span>.io.send(buf))
     }

     <span class="doccomment">/// Tries to send data on the socket to the remote address to which it is
     /// connected.
     ///
     /// When the socket buffer is full, `Err(io::ErrorKind::WouldBlock)` is
     /// returned. This function is usually paired with `writable()`.
     ///
     /// # Returns
     ///
     /// If successful, `Ok(n)` is returned, where `n` is the number of bytes
     /// sent. If the socket is not ready to send data,
     /// `Err(ErrorKind::WouldBlock)` is returned.
     ///
     /// # Examples
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     // Bind a UDP socket
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///
     ///     // Connect to a peer
     ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
     ///
     ///     loop {
     ///         // Wait for the socket to be writable
     ///         socket.writable().await?;
     ///
     ///         // Try to send data, this may still fail with `WouldBlock`
     ///         // if the readiness event is a false positive.
     ///         match socket.try_send(b&quot;hello world&quot;) {
     ///             Ok(n) =&gt; {
     ///                 break;
     ///             }
     ///             Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {
     ///                 continue;
     ///             }
     ///             Err(e) =&gt; {
     ///                 return Err(e);
     ///             }
     ///         }
     ///     }
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub fn </span>try_send(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span>[u8]) -&gt; io::Result&lt;usize&gt; {
         <span class="self">self</span>.io
             .registration()
             .try_io(Interest::WRITABLE, || <span class="self">self</span>.io.send(buf))
     }

     <span class="doccomment">/// Waits for the socket to become readable.
     ///
     /// This function is equivalent to `ready(Interest::READABLE)` and is usually
     /// paired with `try_recv()`.
     ///
     /// The function may complete without the socket being readable. This is a
     /// false-positive and attempting a `try_recv()` will return with
     /// `io::ErrorKind::WouldBlock`.
     ///
     /// # Cancel safety
     ///
     /// This method is cancel safe. Once a readiness event occurs, the method
     /// will continue to return immediately until the readiness event is
     /// consumed by an attempt to read that fails with `WouldBlock` or
     /// `Poll::Pending`.
     ///
     /// # Examples
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     // Connect to a peer
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
     ///
     ///     loop {
     ///         // Wait for the socket to be readable
     ///         socket.readable().await?;
     ///
     ///         // The buffer is **not** included in the async task and will
     ///         // only exist on the stack.
     ///         let mut buf = [0; 1024];
     ///
     ///         // Try to recv data, this may still fail with `WouldBlock`
     ///         // if the readiness event is a false positive.
     ///         match socket.try_recv(&amp;mut buf) {
     ///             Ok(n) =&gt; {
     ///                 println!(&quot;GOT {:?}&quot;, &amp;buf[..n]);
     ///                 break;
     ///             }
     ///             Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {
     ///                 continue;
     ///             }
     ///             Err(e) =&gt; {
     ///                 return Err(e);
     ///             }
     ///         }
     ///     }
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub async fn </span>readable(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.ready(Interest::READABLE).<span class="kw">await</span><span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Polls for read/receive readiness.
     ///
     /// If the udp stream is not currently ready for receiving, this method will
     /// store a clone of the `Waker` from the provided `Context`. When the udp
     /// socket becomes ready for reading, `Waker::wake` will be called on the
     /// waker.
     ///
     /// Note that on multiple calls to `poll_recv_ready`, `poll_recv` or
     /// `poll_peek`, only the `Waker` from the `Context` passed to the most
     /// recent call is scheduled to receive a wakeup. (However,
     /// `poll_send_ready` retains a second, independent waker.)
     ///
     /// This function is intended for cases where creating and pinning a future
     /// via [`readable`] is not feasible. Where possible, using [`readable`] is
     /// preferred, as this supports polling from multiple tasks at once.
     ///
     /// # Return value
     ///
     /// The function returns:
     ///
     /// * `Poll::Pending` if the udp stream is not ready for reading.
     /// * `Poll::Ready(Ok(()))` if the udp stream is ready for reading.
     /// * `Poll::Ready(Err(e))` if an error is encountered.
     ///
     /// # Errors
     ///
     /// This function may encounter any standard I/O error except `WouldBlock`.
     ///
     /// [`readable`]: method@Self::readable
     </span><span class="kw">pub fn </span>poll_recv_ready(<span class="kw-2">&amp;</span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;io::Result&lt;()&gt;&gt; {
         <span class="self">self</span>.io.registration().poll_read_ready(cx).map_ok(|<span class="kw">_</span>| ())
     }

     <span class="doccomment">/// Receives a single datagram message on the socket from the remote address
     /// to which it is connected. On success, returns the number of bytes read.
     ///
     /// The function must be called with valid byte array `buf` of sufficient
     /// size to hold the message bytes. If a message is too long to fit in the
     /// supplied buffer, excess bytes may be discarded.
     ///
     /// The [`connect`] method will connect this socket to a remote address.
     /// This method will fail if the socket is not connected.
     ///
     /// # Cancel safety
     ///
     /// This method is cancel safe. If `recv` is used as the event in a
     /// [`tokio::select!`](crate::select) statement and some other branch
     /// completes first, it is guaranteed that no messages were received on this
     /// socket.
     ///
     /// [`connect`]: method@Self::connect
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     // Bind socket
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
     ///
     ///     let mut buf = vec![0; 10];
     ///     let n = socket.recv(&amp;mut buf).await?;
     ///
     ///     println!(&quot;received {} bytes {:?}&quot;, n, &amp;buf[..n]);
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub async fn </span>recv(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>[u8]) -&gt; io::Result&lt;usize&gt; {
         <span class="self">self</span>.io
             .registration()
             .async_io(Interest::READABLE, || <span class="self">self</span>.io.recv(buf))
             .<span class="kw">await
     </span>}

     <span class="doccomment">/// Attempts to receive a single datagram message on the socket from the remote
     /// address to which it is `connect`ed.
     ///
     /// The [`connect`] method will connect this socket to a remote address. This method
     /// resolves to an error if the socket is not connected.
     ///
     /// Note that on multiple calls to a `poll_*` method in the recv direction, only the
     /// `Waker` from the `Context` passed to the most recent call will be scheduled to
     /// receive a wakeup.
     ///
     /// # Return value
     ///
     /// The function returns:
     ///
     /// * `Poll::Pending` if the socket is not ready to read
     /// * `Poll::Ready(Ok(()))` reads data `ReadBuf` if the socket is ready
     /// * `Poll::Ready(Err(e))` if an error is encountered.
     ///
     /// # Errors
     ///
     /// This function may encounter any standard I/O error except `WouldBlock`.
     ///
     /// [`connect`]: method@Self::connect
     </span><span class="kw">pub fn </span>poll_recv(<span class="kw-2">&amp;</span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;, buf: <span class="kw-2">&amp;mut </span>ReadBuf&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;io::Result&lt;()&gt;&gt; {
         <span class="kw">let </span>n = <span class="macro">ready!</span>(<span class="self">self</span>.io.registration().poll_read_io(cx, || {
             <span class="comment">// Safety: will not read the maybe uninitialized bytes.
             </span><span class="kw">let </span>b = <span class="kw">unsafe </span>{
                 <span class="kw-2">&amp;mut *</span>(buf.unfilled_mut() <span class="kw">as </span><span class="kw-2">*mut </span>[std::mem::MaybeUninit&lt;u8&gt;] <span class="kw">as </span><span class="kw-2">*mut </span>[u8])
             };

             <span class="self">self</span>.io.recv(b)
         }))<span class="question-mark">?</span>;

         <span class="comment">// Safety: We trust `recv` to have filled up `n` bytes in the buffer.
         </span><span class="kw">unsafe </span>{
             buf.assume_init(n);
         }
         buf.advance(n);
         Poll::Ready(<span class="prelude-val">Ok</span>(()))
     }

     <span class="doccomment">/// Tries to receive a single datagram message on the socket from the remote
     /// address to which it is connected. On success, returns the number of
     /// bytes read.
     ///
     /// This method must be called with valid byte array buf of sufficient size
     /// to hold the message bytes. If a message is too long to fit in the
     /// supplied buffer, excess bytes may be discarded.
     ///
     /// When there is no pending data, `Err(io::ErrorKind::WouldBlock)` is
     /// returned. This function is usually paired with `readable()`.
     ///
     /// # Examples
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     // Connect to a peer
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
     ///
     ///     loop {
     ///         // Wait for the socket to be readable
     ///         socket.readable().await?;
     ///
     ///         // The buffer is **not** included in the async task and will
     ///         // only exist on the stack.
     ///         let mut buf = [0; 1024];
     ///
     ///         // Try to recv data, this may still fail with `WouldBlock`
     ///         // if the readiness event is a false positive.
     ///         match socket.try_recv(&amp;mut buf) {
     ///             Ok(n) =&gt; {
     ///                 println!(&quot;GOT {:?}&quot;, &amp;buf[..n]);
     ///                 break;
     ///             }
     ///             Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {
     ///                 continue;
     ///             }
     ///             Err(e) =&gt; {
     ///                 return Err(e);
     ///             }
     ///         }
     ///     }
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub fn </span>try_recv(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>[u8]) -&gt; io::Result&lt;usize&gt; {
         <span class="self">self</span>.io
             .registration()
             .try_io(Interest::READABLE, || <span class="self">self</span>.io.recv(buf))
     }

     <span class="macro">cfg_io_util! </span>{
         <span class="doccomment">/// Tries to receive data from the stream into the provided buffer, advancing the
         /// buffer&#39;s internal cursor, returning how many bytes were read.
         ///
         /// This method must be called with valid byte array buf of sufficient size
         /// to hold the message bytes. If a message is too long to fit in the
         /// supplied buffer, excess bytes may be discarded.
         ///
         /// This method can be used even if `buf` is uninitialized.
         ///
         /// When there is no pending data, `Err(io::ErrorKind::WouldBlock)` is
         /// returned. This function is usually paired with `readable()`.
         ///
         /// # Examples
         ///
         /// ```no_run
         /// use tokio::net::UdpSocket;
         /// use std::io;
         ///
         /// #[tokio::main]
         /// async fn main() -&gt; io::Result&lt;()&gt; {
         ///     // Connect to a peer
         ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
         ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
         ///
         ///     loop {
         ///         // Wait for the socket to be readable
         ///         socket.readable().await?;
         ///
         ///         let mut buf = Vec::with_capacity(1024);
         ///
         ///         // Try to recv data, this may still fail with `WouldBlock`
         ///         // if the readiness event is a false positive.
         ///         match socket.try_recv_buf(&amp;mut buf) {
         ///             Ok(n) =&gt; {
         ///                 println!(&quot;GOT {:?}&quot;, &amp;buf[..n]);
         ///                 break;
         ///             }
         ///             Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {
         ///                 continue;
         ///             }
         ///             Err(e) =&gt; {
         ///                 return Err(e);
         ///             }
         ///         }
         ///     }
         ///
         ///     Ok(())
         /// }
         /// ```
         </span><span class="kw">pub fn </span>try_recv_buf&lt;B: BufMut&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>B) -&gt; io::Result&lt;usize&gt; {
             <span class="self">self</span>.io.registration().try_io(Interest::READABLE, || {
                 <span class="kw">let </span>dst = buf.chunk_mut();
                 <span class="kw">let </span>dst =
                     <span class="kw">unsafe </span>{ <span class="kw-2">&amp;mut *</span>(dst <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_ as </span><span class="kw-2">*mut </span>[std::mem::MaybeUninit&lt;u8&gt;] <span class="kw">as </span><span class="kw-2">*mut </span>[u8]) };

                 <span class="kw">let </span>n = (<span class="kw-2">*</span><span class="self">self</span>.io).recv(dst)<span class="question-mark">?</span>;

                 <span class="comment">// Safety: We trust `UdpSocket::recv` to have filled up `n` bytes in the
                 // buffer.
                 </span><span class="kw">unsafe </span>{
                     buf.advance_mut(n);
                 }

                 <span class="prelude-val">Ok</span>(n)
             })
         }

         <span class="doccomment">/// Receives a single datagram message on the socket from the remote address
         /// to which it is connected, advancing the buffer&#39;s internal cursor,
         /// returning how many bytes were read.
         ///
         /// This method must be called with valid byte array buf of sufficient size
         /// to hold the message bytes. If a message is too long to fit in the
         /// supplied buffer, excess bytes may be discarded.
         ///
         /// This method can be used even if `buf` is uninitialized.
         ///
         /// # Examples
         ///
         /// ```no_run
         /// use tokio::net::UdpSocket;
         /// use std::io;
         ///
         /// #[tokio::main]
         /// async fn main() -&gt; io::Result&lt;()&gt; {
         ///     // Connect to a peer
         ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
         ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
         ///
         ///     let mut buf = Vec::with_capacity(512);
         ///     let len = socket.recv_buf(&amp;mut buf).await?;
         ///
         ///     println!(&quot;received {} bytes {:?}&quot;, len, &amp;buf[..len]);
         ///
         ///     Ok(())
         /// }
         /// ```
         </span><span class="kw">pub async fn </span>recv_buf&lt;B: BufMut&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>B) -&gt; io::Result&lt;usize&gt; {
             <span class="self">self</span>.io.registration().async_io(Interest::READABLE, || {
                 <span class="kw">let </span>dst = buf.chunk_mut();
                 <span class="kw">let </span>dst =
                     <span class="kw">unsafe </span>{ <span class="kw-2">&amp;mut *</span>(dst <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_ as </span><span class="kw-2">*mut </span>[std::mem::MaybeUninit&lt;u8&gt;] <span class="kw">as </span><span class="kw-2">*mut </span>[u8]) };

                 <span class="kw">let </span>n = (<span class="kw-2">*</span><span class="self">self</span>.io).recv(dst)<span class="question-mark">?</span>;

                 <span class="comment">// Safety: We trust `UdpSocket::recv` to have filled up `n` bytes in the
                 // buffer.
                 </span><span class="kw">unsafe </span>{
                     buf.advance_mut(n);
                 }

                 <span class="prelude-val">Ok</span>(n)
             }).<span class="kw">await
         </span>}

         <span class="doccomment">/// Tries to receive a single datagram message on the socket. On success,
         /// returns the number of bytes read and the origin.
         ///
         /// This method must be called with valid byte array buf of sufficient size
         /// to hold the message bytes. If a message is too long to fit in the
         /// supplied buffer, excess bytes may be discarded.
         ///
         /// This method can be used even if `buf` is uninitialized.
         ///
         /// When there is no pending data, `Err(io::ErrorKind::WouldBlock)` is
         /// returned. This function is usually paired with `readable()`.
         ///
         /// # Notes
         /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
         /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
         /// Because UDP is stateless and does not validate the origin of a packet,
         /// the attacker does not need to be able to intercept traffic in order to interfere.
         /// It is important to be aware of this when designing your application-level protocol.
         ///
         /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
         ///
         /// # Examples
         ///
         /// ```no_run
         /// use tokio::net::UdpSocket;
         /// use std::io;
         ///
         /// #[tokio::main]
         /// async fn main() -&gt; io::Result&lt;()&gt; {
         ///     // Connect to a peer
         ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
         ///
         ///     loop {
         ///         // Wait for the socket to be readable
         ///         socket.readable().await?;
         ///
         ///         let mut buf = Vec::with_capacity(1024);
         ///
         ///         // Try to recv data, this may still fail with `WouldBlock`
         ///         // if the readiness event is a false positive.
         ///         match socket.try_recv_buf_from(&amp;mut buf) {
         ///             Ok((n, _addr)) =&gt; {
         ///                 println!(&quot;GOT {:?}&quot;, &amp;buf[..n]);
         ///                 break;
         ///             }
         ///             Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {
         ///                 continue;
         ///             }
         ///             Err(e) =&gt; {
         ///                 return Err(e);
         ///             }
         ///         }
         ///     }
         ///
         ///     Ok(())
         /// }
         /// ```
         </span><span class="kw">pub fn </span>try_recv_buf_from&lt;B: BufMut&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>B) -&gt; io::Result&lt;(usize, SocketAddr)&gt; {
             <span class="self">self</span>.io.registration().try_io(Interest::READABLE, || {
                 <span class="kw">let </span>dst = buf.chunk_mut();
                 <span class="kw">let </span>dst =
                     <span class="kw">unsafe </span>{ <span class="kw-2">&amp;mut *</span>(dst <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_ as </span><span class="kw-2">*mut </span>[std::mem::MaybeUninit&lt;u8&gt;] <span class="kw">as </span><span class="kw-2">*mut </span>[u8]) };

                 <span class="kw">let </span>(n, addr) = (<span class="kw-2">*</span><span class="self">self</span>.io).recv_from(dst)<span class="question-mark">?</span>;

                 <span class="comment">// Safety: We trust `UdpSocket::recv_from` to have filled up `n` bytes in the
                 // buffer.
                 </span><span class="kw">unsafe </span>{
                     buf.advance_mut(n);
                 }

                 <span class="prelude-val">Ok</span>((n, addr))
             })
         }

         <span class="doccomment">/// Receives a single datagram message on the socket, advancing the
         /// buffer&#39;s internal cursor, returning how many bytes were read and the origin.
         ///
         /// This method must be called with valid byte array buf of sufficient size
         /// to hold the message bytes. If a message is too long to fit in the
         /// supplied buffer, excess bytes may be discarded.
         ///
         /// This method can be used even if `buf` is uninitialized.
         ///
         /// # Notes
         /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
         /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
         /// Because UDP is stateless and does not validate the origin of a packet,
         /// the attacker does not need to be able to intercept traffic in order to interfere.
         /// It is important to be aware of this when designing your application-level protocol.
         ///
         /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
         ///
         /// # Examples
         ///
         /// ```no_run
         /// use tokio::net::UdpSocket;
         /// use std::io;
         ///
         /// #[tokio::main]
         /// async fn main() -&gt; io::Result&lt;()&gt; {
         ///     // Connect to a peer
         ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
         ///     socket.connect(&quot;127.0.0.1:8081&quot;).await?;
         ///
         ///     let mut buf = Vec::with_capacity(512);
         ///     let (len, addr) = socket.recv_buf_from(&amp;mut buf).await?;
         ///
         ///     println!(&quot;received {:?} bytes from {:?}&quot;, len, addr);
         ///
         ///     Ok(())
         /// }
         /// ```
         </span><span class="kw">pub async fn </span>recv_buf_from&lt;B: BufMut&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>B) -&gt; io::Result&lt;(usize, SocketAddr)&gt; {
             <span class="self">self</span>.io.registration().async_io(Interest::READABLE, || {
                 <span class="kw">let </span>dst = buf.chunk_mut();
                 <span class="kw">let </span>dst =
                     <span class="kw">unsafe </span>{ <span class="kw-2">&amp;mut *</span>(dst <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_ as </span><span class="kw-2">*mut </span>[std::mem::MaybeUninit&lt;u8&gt;] <span class="kw">as </span><span class="kw-2">*mut </span>[u8]) };

                 <span class="kw">let </span>(n, addr) = (<span class="kw-2">*</span><span class="self">self</span>.io).recv_from(dst)<span class="question-mark">?</span>;

                 <span class="comment">// Safety: We trust `UdpSocket::recv_from` to have filled up `n` bytes in the
                 // buffer.
                 </span><span class="kw">unsafe </span>{
                     buf.advance_mut(n);
                 }

                 <span class="prelude-val">Ok</span>((n,addr))
             }).<span class="kw">await
         </span>}
     }

     <span class="doccomment">/// Sends data on the socket to the given address. On success, returns the
     /// number of bytes written.
     ///
     /// Address type can be any implementor of [`ToSocketAddrs`] trait. See its
     /// documentation for concrete examples.
     ///
     /// It is possible for `addr` to yield multiple addresses, but `send_to`
     /// will only send data to the first address yielded by `addr`.
     ///
     /// This will return an error when the IP version of the local socket does
     /// not match that returned from [`ToSocketAddrs`].
     ///
     /// [`ToSocketAddrs`]: crate::net::ToSocketAddrs
     ///
     /// # Cancel safety
     ///
     /// This method is cancel safe. If `send_to` is used as the event in a
     /// [`tokio::select!`](crate::select) statement and some other branch
     /// completes first, then it is guaranteed that the message was not sent.
     ///
     /// # Example
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///     let len = socket.send_to(b&quot;hello world&quot;, &quot;127.0.0.1:8081&quot;).await?;
     ///
     ///     println!(&quot;Sent {} bytes&quot;, len);
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub async fn </span>send_to&lt;A: ToSocketAddrs&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span>[u8], target: A) -&gt; io::Result&lt;usize&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>addrs = to_socket_addrs(target).<span class="kw">await</span><span class="question-mark">?</span>;

         <span class="kw">match </span>addrs.next() {
             <span class="prelude-val">Some</span>(target) =&gt; <span class="self">self</span>.send_to_addr(buf, target).<span class="kw">await</span>,
             <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(io::Error::new(
                 io::ErrorKind::InvalidInput,
                 <span class="string">&quot;no addresses to send data to&quot;</span>,
             )),
         }
     }

     <span class="doccomment">/// Attempts to send data on the socket to a given address.
     ///
     /// Note that on multiple calls to a `poll_*` method in the send direction, only the
     /// `Waker` from the `Context` passed to the most recent call will be scheduled to
     /// receive a wakeup.
     ///
     /// # Return value
     ///
     /// The function returns:
     ///
     /// * `Poll::Pending` if the socket is not ready to write
     /// * `Poll::Ready(Ok(n))` `n` is the number of bytes sent.
     /// * `Poll::Ready(Err(e))` if an error is encountered.
     ///
     /// # Errors
     ///
     /// This function may encounter any standard I/O error except `WouldBlock`.
     </span><span class="kw">pub fn </span>poll_send_to(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;,
         buf: <span class="kw-2">&amp;</span>[u8],
         target: SocketAddr,
     ) -&gt; Poll&lt;io::Result&lt;usize&gt;&gt; {
         <span class="self">self</span>.io
             .registration()
             .poll_write_io(cx, || <span class="self">self</span>.io.send_to(buf, target))
     }

     <span class="doccomment">/// Tries to send data on the socket to the given address, but if the send is
     /// blocked this will return right away.
     ///
     /// This function is usually paired with `writable()`.
     ///
     /// # Returns
     ///
     /// If successful, returns the number of bytes sent
     ///
     /// Users should ensure that when the remote cannot receive, the
     /// [`ErrorKind::WouldBlock`] is properly handled. An error can also occur
     /// if the IP version of the socket does not match that of `target`.
     ///
     /// [`ErrorKind::WouldBlock`]: std::io::ErrorKind::WouldBlock
     ///
     /// # Example
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::error::Error;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; Result&lt;(), Box&lt;dyn Error&gt;&gt; {
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///
     ///     let dst = &quot;127.0.0.1:8081&quot;.parse()?;
     ///
     ///     loop {
     ///         socket.writable().await?;
     ///
     ///         match socket.try_send_to(&amp;b&quot;hello world&quot;[..], dst) {
     ///             Ok(sent) =&gt; {
     ///                 println!(&quot;sent {} bytes&quot;, sent);
     ///                 break;
     ///             }
     ///             Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {
     ///                 // Writable false positive.
     ///                 continue;
     ///             }
     ///             Err(e) =&gt; return Err(e.into()),
     ///         }
     ///     }
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub fn </span>try_send_to(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span>[u8], target: SocketAddr) -&gt; io::Result&lt;usize&gt; {
         <span class="self">self</span>.io
             .registration()
             .try_io(Interest::WRITABLE, || <span class="self">self</span>.io.send_to(buf, target))
     }

     <span class="kw">async fn </span>send_to_addr(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span>[u8], target: SocketAddr) -&gt; io::Result&lt;usize&gt; {
         <span class="self">self</span>.io
             .registration()
             .async_io(Interest::WRITABLE, || <span class="self">self</span>.io.send_to(buf, target))
             .<span class="kw">await
     </span>}

     <span class="doccomment">/// Receives a single datagram message on the socket. On success, returns
     /// the number of bytes read and the origin.
     ///
     /// The function must be called with valid byte array `buf` of sufficient
     /// size to hold the message bytes. If a message is too long to fit in the
     /// supplied buffer, excess bytes may be discarded.
     ///
     /// # Cancel safety
     ///
     /// This method is cancel safe. If `recv_from` is used as the event in a
     /// [`tokio::select!`](crate::select) statement and some other branch
     /// completes first, it is guaranteed that no messages were received on this
     /// socket.
     ///
     /// # Example
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///
     ///     let mut buf = vec![0u8; 32];
     ///     let (len, addr) = socket.recv_from(&amp;mut buf).await?;
     ///
     ///     println!(&quot;received {:?} bytes from {:?}&quot;, len, addr);
     ///
     ///     Ok(())
     /// }
     /// ```
     ///
     /// # Notes
     /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
     /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
     /// Because UDP is stateless and does not validate the origin of a packet,
     /// the attacker does not need to be able to intercept traffic in order to interfere.
     /// It is important to be aware of this when designing your application-level protocol.
     ///
     /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
     </span><span class="kw">pub async fn </span>recv_from(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>[u8]) -&gt; io::Result&lt;(usize, SocketAddr)&gt; {
         <span class="self">self</span>.io
             .registration()
             .async_io(Interest::READABLE, || <span class="self">self</span>.io.recv_from(buf))
             .<span class="kw">await
     </span>}

     <span class="doccomment">/// Attempts to receive a single datagram on the socket.
     ///
     /// Note that on multiple calls to a `poll_*` method in the recv direction, only the
     /// `Waker` from the `Context` passed to the most recent call will be scheduled to
     /// receive a wakeup.
     ///
     /// # Return value
     ///
     /// The function returns:
     ///
     /// * `Poll::Pending` if the socket is not ready to read
     /// * `Poll::Ready(Ok(addr))` reads data from `addr` into `ReadBuf` if the socket is ready
     /// * `Poll::Ready(Err(e))` if an error is encountered.
     ///
     /// # Errors
     ///
     /// This function may encounter any standard I/O error except `WouldBlock`.
     ///
     /// # Notes
     /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
     /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
     /// Because UDP is stateless and does not validate the origin of a packet,
     /// the attacker does not need to be able to intercept traffic in order to interfere.
     /// It is important to be aware of this when designing your application-level protocol.
     ///
     /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
     </span><span class="kw">pub fn </span>poll_recv_from(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;,
         buf: <span class="kw-2">&amp;mut </span>ReadBuf&lt;<span class="lifetime">&#39;_</span>&gt;,
     ) -&gt; Poll&lt;io::Result&lt;SocketAddr&gt;&gt; {
         <span class="kw">let </span>(n, addr) = <span class="macro">ready!</span>(<span class="self">self</span>.io.registration().poll_read_io(cx, || {
             <span class="comment">// Safety: will not read the maybe uninitialized bytes.
             </span><span class="kw">let </span>b = <span class="kw">unsafe </span>{
                 <span class="kw-2">&amp;mut *</span>(buf.unfilled_mut() <span class="kw">as </span><span class="kw-2">*mut </span>[std::mem::MaybeUninit&lt;u8&gt;] <span class="kw">as </span><span class="kw-2">*mut </span>[u8])
             };

             <span class="self">self</span>.io.recv_from(b)
         }))<span class="question-mark">?</span>;

         <span class="comment">// Safety: We trust `recv` to have filled up `n` bytes in the buffer.
         </span><span class="kw">unsafe </span>{
             buf.assume_init(n);
         }
         buf.advance(n);
         Poll::Ready(<span class="prelude-val">Ok</span>(addr))
     }

     <span class="doccomment">/// Tries to receive a single datagram message on the socket. On success,
     /// returns the number of bytes read and the origin.
     ///
     /// This method must be called with valid byte array buf of sufficient size
     /// to hold the message bytes. If a message is too long to fit in the
     /// supplied buffer, excess bytes may be discarded.
     ///
     /// When there is no pending data, `Err(io::ErrorKind::WouldBlock)` is
     /// returned. This function is usually paired with `readable()`.
     ///
     /// # Notes
     ///
     /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
     /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
     /// Because UDP is stateless and does not validate the origin of a packet,
     /// the attacker does not need to be able to intercept traffic in order to interfere.
     /// It is important to be aware of this when designing your application-level protocol.
     ///
     /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
     ///
     /// # Examples
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     // Connect to a peer
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///
     ///     loop {
     ///         // Wait for the socket to be readable
     ///         socket.readable().await?;
     ///
     ///         // The buffer is **not** included in the async task and will
     ///         // only exist on the stack.
     ///         let mut buf = [0; 1024];
     ///
     ///         // Try to recv data, this may still fail with `WouldBlock`
     ///         // if the readiness event is a false positive.
     ///         match socket.try_recv_from(&amp;mut buf) {
     ///             Ok((n, _addr)) =&gt; {
     ///                 println!(&quot;GOT {:?}&quot;, &amp;buf[..n]);
     ///                 break;
     ///             }
     ///             Err(ref e) if e.kind() == io::ErrorKind::WouldBlock =&gt; {
     ///                 continue;
     ///             }
     ///             Err(e) =&gt; {
     ///                 return Err(e);
     ///             }
     ///         }
     ///     }
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub fn </span>try_recv_from(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>[u8]) -&gt; io::Result&lt;(usize, SocketAddr)&gt; {
         <span class="self">self</span>.io
             .registration()
             .try_io(Interest::READABLE, || <span class="self">self</span>.io.recv_from(buf))
     }

     <span class="doccomment">/// Tries to read or write from the socket using a user-provided IO operation.
     ///
     /// If the socket is ready, the provided closure is called. The closure
     /// should attempt to perform IO operation on the socket by manually
     /// calling the appropriate syscall. If the operation fails because the
     /// socket is not actually ready, then the closure should return a
     /// `WouldBlock` error and the readiness flag is cleared. The return value
     /// of the closure is then returned by `try_io`.
     ///
     /// If the socket is not ready, then the closure is not called
     /// and a `WouldBlock` error is returned.
     ///
     /// The closure should only return a `WouldBlock` error if it has performed
     /// an IO operation on the socket that failed due to the socket not being
     /// ready. Returning a `WouldBlock` error in any other situation will
     /// incorrectly clear the readiness flag, which can cause the socket to
     /// behave incorrectly.
     ///
     /// The closure should not perform the IO operation using any of the methods
     /// defined on the Tokio `UdpSocket` type, as this will mess with the
     /// readiness flag and can cause the socket to behave incorrectly.
     ///
     /// This method is not intended to be used with combined interests.
     /// The closure should perform only one type of IO operation, so it should not
     /// require more than one ready state. This method may panic or sleep forever
     /// if it is called with a combined interest.
     ///
     /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function.
     ///
     /// [`readable()`]: UdpSocket::readable()
     /// [`writable()`]: UdpSocket::writable()
     /// [`ready()`]: UdpSocket::ready()
     </span><span class="kw">pub fn </span>try_io&lt;R&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         interest: Interest,
         f: <span class="kw">impl </span>FnOnce() -&gt; io::Result&lt;R&gt;,
     ) -&gt; io::Result&lt;R&gt; {
         <span class="self">self</span>.io
             .registration()
             .try_io(interest, || <span class="self">self</span>.io.try_io(f))
     }

     <span class="doccomment">/// Reads or writes from the socket using a user-provided IO operation.
     ///
     /// The readiness of the socket is awaited and when the socket is ready,
     /// the provided closure is called. The closure should attempt to perform
     /// IO operation on the socket by manually calling the appropriate syscall.
     /// If the operation fails because the socket is not actually ready,
     /// then the closure should return a `WouldBlock` error. In such case the
     /// readiness flag is cleared and the socket readiness is awaited again.
     /// This loop is repeated until the closure returns an `Ok` or an error
     /// other than `WouldBlock`.
     ///
     /// The closure should only return a `WouldBlock` error if it has performed
     /// an IO operation on the socket that failed due to the socket not being
     /// ready. Returning a `WouldBlock` error in any other situation will
     /// incorrectly clear the readiness flag, which can cause the socket to
     /// behave incorrectly.
     ///
     /// The closure should not perform the IO operation using any of the methods
     /// defined on the Tokio `UdpSocket` type, as this will mess with the
     /// readiness flag and can cause the socket to behave incorrectly.
     ///
     /// This method is not intended to be used with combined interests.
     /// The closure should perform only one type of IO operation, so it should not
     /// require more than one ready state. This method may panic or sleep forever
     /// if it is called with a combined interest.
     </span><span class="kw">pub async fn </span>async_io&lt;R&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         interest: Interest,
         <span class="kw-2">mut </span>f: <span class="kw">impl </span>FnMut() -&gt; io::Result&lt;R&gt;,
     ) -&gt; io::Result&lt;R&gt; {
         <span class="self">self</span>.io
             .registration()
             .async_io(interest, || <span class="self">self</span>.io.try_io(<span class="kw-2">&amp;mut </span>f))
             .<span class="kw">await
     </span>}

     <span class="doccomment">/// Receives data from the socket, without removing it from the input queue.
     /// On success, returns the number of bytes read and the address from whence
     /// the data came.
     ///
     /// # Notes
     ///
     /// On Windows, if the data is larger than the buffer specified, the buffer
     /// is filled with the first part of the data, and peek_from returns the error
     /// WSAEMSGSIZE(10040). The excess data is lost.
     /// Make sure to always use a sufficiently large buffer to hold the
     /// maximum UDP packet size, which can be up to 65536 bytes in size.
     ///
     /// MacOS will return an error if you pass a zero-sized buffer.
     ///
     /// If you&#39;re merely interested in learning the sender of the data at the head of the queue,
     /// try [`peek_sender`].
     ///
     /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
     /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
     /// Because UDP is stateless and does not validate the origin of a packet,
     /// the attacker does not need to be able to intercept traffic in order to interfere.
     /// It is important to be aware of this when designing your application-level protocol.
     ///
     /// # Examples
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     let socket = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///
     ///     let mut buf = vec![0u8; 32];
     ///     let (len, addr) = socket.peek_from(&amp;mut buf).await?;
     ///
     ///     println!(&quot;peeked {:?} bytes from {:?}&quot;, len, addr);
     ///
     ///     Ok(())
     /// }
     /// ```
     ///
     /// [`peek_sender`]: method@Self::peek_sender
     /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
     </span><span class="kw">pub async fn </span>peek_from(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>[u8]) -&gt; io::Result&lt;(usize, SocketAddr)&gt; {
         <span class="self">self</span>.io
             .registration()
             .async_io(Interest::READABLE, || <span class="self">self</span>.io.peek_from(buf))
             .<span class="kw">await
     </span>}

     <span class="doccomment">/// Receives data from the socket, without removing it from the input queue.
     /// On success, returns the sending address of the datagram.
     ///
     /// # Notes
     ///
     /// Note that on multiple calls to a `poll_*` method in the recv direction, only the
     /// `Waker` from the `Context` passed to the most recent call will be scheduled to
     /// receive a wakeup
     ///
     /// On Windows, if the data is larger than the buffer specified, the buffer
     /// is filled with the first part of the data, and peek returns the error
     /// WSAEMSGSIZE(10040). The excess data is lost.
     /// Make sure to always use a sufficiently large buffer to hold the
     /// maximum UDP packet size, which can be up to 65536 bytes in size.
     ///
     /// MacOS will return an error if you pass a zero-sized buffer.
     ///
     /// If you&#39;re merely interested in learning the sender of the data at the head of the queue,
     /// try [`poll_peek_sender`].
     ///
     /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
     /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
     /// Because UDP is stateless and does not validate the origin of a packet,
     /// the attacker does not need to be able to intercept traffic in order to interfere.
     /// It is important to be aware of this when designing your application-level protocol.
     ///
     /// # Return value
     ///
     /// The function returns:
     ///
     /// * `Poll::Pending` if the socket is not ready to read
     /// * `Poll::Ready(Ok(addr))` reads data from `addr` into `ReadBuf` if the socket is ready
     /// * `Poll::Ready(Err(e))` if an error is encountered.
     ///
     /// # Errors
     ///
     /// This function may encounter any standard I/O error except `WouldBlock`.
     ///
     /// [`poll_peek_sender`]: method@Self::poll_peek_sender
     /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
     </span><span class="kw">pub fn </span>poll_peek_from(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;,
         buf: <span class="kw-2">&amp;mut </span>ReadBuf&lt;<span class="lifetime">&#39;_</span>&gt;,
     ) -&gt; Poll&lt;io::Result&lt;SocketAddr&gt;&gt; {
         <span class="kw">let </span>(n, addr) = <span class="macro">ready!</span>(<span class="self">self</span>.io.registration().poll_read_io(cx, || {
             <span class="comment">// Safety: will not read the maybe uninitialized bytes.
             </span><span class="kw">let </span>b = <span class="kw">unsafe </span>{
                 <span class="kw-2">&amp;mut *</span>(buf.unfilled_mut() <span class="kw">as </span><span class="kw-2">*mut </span>[std::mem::MaybeUninit&lt;u8&gt;] <span class="kw">as </span><span class="kw-2">*mut </span>[u8])
             };

             <span class="self">self</span>.io.peek_from(b)
         }))<span class="question-mark">?</span>;

         <span class="comment">// Safety: We trust `recv` to have filled up `n` bytes in the buffer.
         </span><span class="kw">unsafe </span>{
             buf.assume_init(n);
         }
         buf.advance(n);
         Poll::Ready(<span class="prelude-val">Ok</span>(addr))
     }

     <span class="doccomment">/// Tries to receive data on the socket without removing it from the input queue.
     /// On success, returns the number of bytes read and the sending address of the
     /// datagram.
     ///
     /// When there is no pending data, `Err(io::ErrorKind::WouldBlock)` is
     /// returned. This function is usually paired with `readable()`.
     ///
     /// # Notes
     ///
     /// On Windows, if the data is larger than the buffer specified, the buffer
     /// is filled with the first part of the data, and peek returns the error
     /// WSAEMSGSIZE(10040). The excess data is lost.
     /// Make sure to always use a sufficiently large buffer to hold the
     /// maximum UDP packet size, which can be up to 65536 bytes in size.
     ///
     /// MacOS will return an error if you pass a zero-sized buffer.
     ///
     /// If you&#39;re merely interested in learning the sender of the data at the head of the queue,
     /// try [`try_peek_sender`].
     ///
     /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
     /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
     /// Because UDP is stateless and does not validate the origin of a packet,
     /// the attacker does not need to be able to intercept traffic in order to interfere.
     /// It is important to be aware of this when designing your application-level protocol.
     ///
     /// [`try_peek_sender`]: method@Self::try_peek_sender
     /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
     </span><span class="kw">pub fn </span>try_peek_from(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>[u8]) -&gt; io::Result&lt;(usize, SocketAddr)&gt; {
         <span class="self">self</span>.io
             .registration()
             .try_io(Interest::READABLE, || <span class="self">self</span>.io.peek_from(buf))
     }

     <span class="doccomment">/// Retrieve the sender of the data at the head of the input queue, waiting if empty.
     ///
     /// This is equivalent to calling [`peek_from`] with a zero-sized buffer,
     /// but suppresses the `WSAEMSGSIZE` error on Windows and the &quot;invalid argument&quot; error on macOS.
     ///
     /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
     /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
     /// Because UDP is stateless and does not validate the origin of a packet,
     /// the attacker does not need to be able to intercept traffic in order to interfere.
     /// It is important to be aware of this when designing your application-level protocol.
     ///
     /// [`peek_from`]: method@Self::peek_from
     /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
     </span><span class="kw">pub async fn </span>peek_sender(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;SocketAddr&gt; {
         <span class="self">self</span>.io
             .registration()
             .async_io(Interest::READABLE, || <span class="self">self</span>.peek_sender_inner())
             .<span class="kw">await
     </span>}

     <span class="doccomment">/// Retrieve the sender of the data at the head of the input queue,
     /// scheduling a wakeup if empty.
     ///
     /// This is equivalent to calling [`poll_peek_from`] with a zero-sized buffer,
     /// but suppresses the `WSAEMSGSIZE` error on Windows and the &quot;invalid argument&quot; error on macOS.
     ///
     /// # Notes
     ///
     /// Note that on multiple calls to a `poll_*` method in the recv direction, only the
     /// `Waker` from the `Context` passed to the most recent call will be scheduled to
     /// receive a wakeup.
     ///
     /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
     /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
     /// Because UDP is stateless and does not validate the origin of a packet,
     /// the attacker does not need to be able to intercept traffic in order to interfere.
     /// It is important to be aware of this when designing your application-level protocol.
     ///
     /// [`poll_peek_from`]: method@Self::poll_peek_from
     /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
     </span><span class="kw">pub fn </span>poll_peek_sender(<span class="kw-2">&amp;</span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;io::Result&lt;SocketAddr&gt;&gt; {
         <span class="self">self</span>.io
             .registration()
             .poll_read_io(cx, || <span class="self">self</span>.peek_sender_inner())
     }

     <span class="doccomment">/// Try to retrieve the sender of the data at the head of the input queue.
     ///
     /// When there is no pending data, `Err(io::ErrorKind::WouldBlock)` is
     /// returned. This function is usually paired with `readable()`.
     ///
     /// Note that the socket address **cannot** be implicitly trusted, because it is relatively
     /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack].
     /// Because UDP is stateless and does not validate the origin of a packet,
     /// the attacker does not need to be able to intercept traffic in order to interfere.
     /// It is important to be aware of this when designing your application-level protocol.
     ///
     /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection
     </span><span class="kw">pub fn </span>try_peek_sender(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;SocketAddr&gt; {
         <span class="self">self</span>.io
             .registration()
             .try_io(Interest::READABLE, || <span class="self">self</span>.peek_sender_inner())
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>peek_sender_inner(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;SocketAddr&gt; {
         <span class="self">self</span>.io.try_io(|| {
             <span class="self">self</span>.as_socket()
                 .peek_sender()<span class="question-mark">?
                 </span><span class="comment">// May be `None` if the platform doesn&#39;t populate the sender for some reason.
                 // In testing, that only occurred on macOS if you pass a zero-sized buffer,
                 // but the implementation of `Socket::peek_sender()` covers that.
                 </span>.as_socket()
                 .ok_or_else(|| io::Error::new(io::ErrorKind::Other, <span class="string">&quot;sender not available&quot;</span>))
         })
     }

     <span class="doccomment">/// Gets the value of the `SO_BROADCAST` option for this socket.
     ///
     /// For more information about this option, see [`set_broadcast`].
     ///
     /// [`set_broadcast`]: method@Self::set_broadcast
     </span><span class="kw">pub fn </span>broadcast(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;bool&gt; {
         <span class="self">self</span>.io.broadcast()
     }

     <span class="doccomment">/// Sets the value of the `SO_BROADCAST` option for this socket.
     ///
     /// When enabled, this socket is allowed to send packets to a broadcast
     /// address.
     </span><span class="kw">pub fn </span>set_broadcast(<span class="kw-2">&amp;</span><span class="self">self</span>, on: bool) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.io.set_broadcast(on)
     }

     <span class="doccomment">/// Gets the value of the `IP_MULTICAST_LOOP` option for this socket.
     ///
     /// For more information about this option, see [`set_multicast_loop_v4`].
     ///
     /// [`set_multicast_loop_v4`]: method@Self::set_multicast_loop_v4
     </span><span class="kw">pub fn </span>multicast_loop_v4(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;bool&gt; {
         <span class="self">self</span>.io.multicast_loop_v4()
     }

     <span class="doccomment">/// Sets the value of the `IP_MULTICAST_LOOP` option for this socket.
     ///
     /// If enabled, multicast packets will be looped back to the local socket.
     ///
     /// # Note
     ///
     /// This may not have any affect on IPv6 sockets.
     </span><span class="kw">pub fn </span>set_multicast_loop_v4(<span class="kw-2">&amp;</span><span class="self">self</span>, on: bool) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.io.set_multicast_loop_v4(on)
     }

     <span class="doccomment">/// Gets the value of the `IP_MULTICAST_TTL` option for this socket.
     ///
     /// For more information about this option, see [`set_multicast_ttl_v4`].
     ///
     /// [`set_multicast_ttl_v4`]: method@Self::set_multicast_ttl_v4
     </span><span class="kw">pub fn </span>multicast_ttl_v4(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;u32&gt; {
         <span class="self">self</span>.io.multicast_ttl_v4()
     }

     <span class="doccomment">/// Sets the value of the `IP_MULTICAST_TTL` option for this socket.
     ///
     /// Indicates the time-to-live value of outgoing multicast packets for
     /// this socket. The default value is 1 which means that multicast packets
     /// don&#39;t leave the local network unless explicitly requested.
     ///
     /// # Note
     ///
     /// This may not have any affect on IPv6 sockets.
     </span><span class="kw">pub fn </span>set_multicast_ttl_v4(<span class="kw-2">&amp;</span><span class="self">self</span>, ttl: u32) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.io.set_multicast_ttl_v4(ttl)
     }

     <span class="doccomment">/// Gets the value of the `IPV6_MULTICAST_LOOP` option for this socket.
     ///
     /// For more information about this option, see [`set_multicast_loop_v6`].
     ///
     /// [`set_multicast_loop_v6`]: method@Self::set_multicast_loop_v6
     </span><span class="kw">pub fn </span>multicast_loop_v6(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;bool&gt; {
         <span class="self">self</span>.io.multicast_loop_v6()
     }

     <span class="doccomment">/// Sets the value of the `IPV6_MULTICAST_LOOP` option for this socket.
     ///
     /// Controls whether this socket sees the multicast packets it sends itself.
     ///
     /// # Note
     ///
     /// This may not have any affect on IPv4 sockets.
     </span><span class="kw">pub fn </span>set_multicast_loop_v6(<span class="kw-2">&amp;</span><span class="self">self</span>, on: bool) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.io.set_multicast_loop_v6(on)
     }

     <span class="doccomment">/// Gets the value of the `IP_TTL` option for this socket.
     ///
     /// For more information about this option, see [`set_ttl`].
     ///
     /// [`set_ttl`]: method@Self::set_ttl
     ///
     /// # Examples
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// # use std::io;
     ///
     /// # async fn dox() -&gt; io::Result&lt;()&gt; {
     /// let sock = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     ///
     /// println!(&quot;{:?}&quot;, sock.ttl()?);
     /// # Ok(())
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>ttl(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;u32&gt; {
         <span class="self">self</span>.io.ttl()
     }

     <span class="doccomment">/// Sets the value for the `IP_TTL` option on this socket.
     ///
     /// This value sets the time-to-live field that is used in every packet sent
     /// from this socket.
     ///
     /// # Examples
     ///
     /// ```no_run
     /// use tokio::net::UdpSocket;
     /// # use std::io;
     ///
     /// # async fn dox() -&gt; io::Result&lt;()&gt; {
     /// let sock = UdpSocket::bind(&quot;127.0.0.1:8080&quot;).await?;
     /// sock.set_ttl(60)?;
     ///
     /// # Ok(())
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>set_ttl(<span class="kw-2">&amp;</span><span class="self">self</span>, ttl: u32) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.io.set_ttl(ttl)
     }

     <span class="doccomment">/// Gets the value of the `IP_TOS` option for this socket.
     ///
     /// For more information about this option, see [`set_tos`].
     ///
     /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or
     /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options)
     ///
     /// [`set_tos`]: Self::set_tos
     </span><span class="comment">// https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178
     </span><span class="attribute">#[cfg(not(any(
         target_os = <span class="string">&quot;fuchsia&quot;</span>,
         target_os = <span class="string">&quot;redox&quot;</span>,
         target_os = <span class="string">&quot;solaris&quot;</span>,
         target_os = <span class="string">&quot;illumos&quot;</span>,
     )))]
     #[cfg_attr(
         docsrs,
         doc(cfg(not(any(
             target_os = <span class="string">&quot;fuchsia&quot;</span>,
             target_os = <span class="string">&quot;redox&quot;</span>,
             target_os = <span class="string">&quot;solaris&quot;</span>,
             target_os = <span class="string">&quot;illumos&quot;</span>,
         ))))
     )]
     </span><span class="kw">pub fn </span>tos(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;u32&gt; {
         <span class="self">self</span>.as_socket().tos()
     }

     <span class="doccomment">/// Sets the value for the `IP_TOS` option on this socket.
     ///
     /// This value sets the type-of-service field that is used in every packet
     /// sent from this socket.
     ///
     /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or
     /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options)
     </span><span class="comment">// https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178
     </span><span class="attribute">#[cfg(not(any(
         target_os = <span class="string">&quot;fuchsia&quot;</span>,
         target_os = <span class="string">&quot;redox&quot;</span>,
         target_os = <span class="string">&quot;solaris&quot;</span>,
         target_os = <span class="string">&quot;illumos&quot;</span>,
     )))]
     #[cfg_attr(
         docsrs,
         doc(cfg(not(any(
             target_os = <span class="string">&quot;fuchsia&quot;</span>,
             target_os = <span class="string">&quot;redox&quot;</span>,
             target_os = <span class="string">&quot;solaris&quot;</span>,
             target_os = <span class="string">&quot;illumos&quot;</span>,
         ))))
     )]
     </span><span class="kw">pub fn </span>set_tos(<span class="kw-2">&amp;</span><span class="self">self</span>, tos: u32) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.as_socket().set_tos(tos)
     }

     <span class="doccomment">/// Gets the value for the `SO_BINDTODEVICE` option on this socket
     ///
     /// This value gets the socket-bound device&#39;s interface name.
     </span><span class="attribute">#[cfg(any(target_os = <span class="string">&quot;android&quot;</span>, target_os = <span class="string">&quot;fuchsia&quot;</span>, target_os = <span class="string">&quot;linux&quot;</span>,))]
     #[cfg_attr(
         docsrs,
         doc(cfg(any(target_os = <span class="string">&quot;android&quot;</span>, target_os = <span class="string">&quot;fuchsia&quot;</span>, target_os = <span class="string">&quot;linux&quot;</span>,)))
     )]
     </span><span class="kw">pub fn </span>device(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;<span class="prelude-ty">Option</span>&lt;Vec&lt;u8&gt;&gt;&gt; {
         <span class="self">self</span>.as_socket().device()
     }

     <span class="doccomment">/// Sets the value for the `SO_BINDTODEVICE` option on this socket
     ///
     /// If a socket is bound to an interface, only packets received from that
     /// particular interface are processed by the socket. Note that this only
     /// works for some socket types, particularly `AF_INET` sockets.
     ///
     /// If `interface` is `None` or an empty string it removes the binding.
     </span><span class="attribute">#[cfg(all(any(target_os = <span class="string">&quot;android&quot;</span>, target_os = <span class="string">&quot;fuchsia&quot;</span>, target_os = <span class="string">&quot;linux&quot;</span>)))]
     #[cfg_attr(
         docsrs,
         doc(cfg(all(any(target_os = <span class="string">&quot;android&quot;</span>, target_os = <span class="string">&quot;fuchsia&quot;</span>, target_os = <span class="string">&quot;linux&quot;</span>))))
     )]
     </span><span class="kw">pub fn </span>bind_device(<span class="kw-2">&amp;</span><span class="self">self</span>, interface: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>[u8]&gt;) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.as_socket().bind_device(interface)
     }

     <span class="doccomment">/// Executes an operation of the `IP_ADD_MEMBERSHIP` type.
     ///
     /// This function specifies a new multicast group for this socket to join.
     /// The address must be a valid multicast address, and `interface` is the
     /// address of the local interface with which the system should join the
     /// multicast group. If it&#39;s equal to `INADDR_ANY` then an appropriate
     /// interface is chosen by the system.
     </span><span class="kw">pub fn </span>join_multicast_v4(<span class="kw-2">&amp;</span><span class="self">self</span>, multiaddr: Ipv4Addr, interface: Ipv4Addr) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.io.join_multicast_v4(<span class="kw-2">&amp;</span>multiaddr, <span class="kw-2">&amp;</span>interface)
     }

     <span class="doccomment">/// Executes an operation of the `IPV6_ADD_MEMBERSHIP` type.
     ///
     /// This function specifies a new multicast group for this socket to join.
     /// The address must be a valid multicast address, and `interface` is the
     /// index of the interface to join/leave (or 0 to indicate any interface).
     </span><span class="kw">pub fn </span>join_multicast_v6(<span class="kw-2">&amp;</span><span class="self">self</span>, multiaddr: <span class="kw-2">&amp;</span>Ipv6Addr, interface: u32) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.io.join_multicast_v6(multiaddr, interface)
     }

     <span class="doccomment">/// Executes an operation of the `IP_DROP_MEMBERSHIP` type.
     ///
     /// For more information about this option, see [`join_multicast_v4`].
     ///
     /// [`join_multicast_v4`]: method@Self::join_multicast_v4
     </span><span class="kw">pub fn </span>leave_multicast_v4(<span class="kw-2">&amp;</span><span class="self">self</span>, multiaddr: Ipv4Addr, interface: Ipv4Addr) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.io.leave_multicast_v4(<span class="kw-2">&amp;</span>multiaddr, <span class="kw-2">&amp;</span>interface)
     }

     <span class="doccomment">/// Executes an operation of the `IPV6_DROP_MEMBERSHIP` type.
     ///
     /// For more information about this option, see [`join_multicast_v6`].
     ///
     /// [`join_multicast_v6`]: method@Self::join_multicast_v6
     </span><span class="kw">pub fn </span>leave_multicast_v6(<span class="kw-2">&amp;</span><span class="self">self</span>, multiaddr: <span class="kw-2">&amp;</span>Ipv6Addr, interface: u32) -&gt; io::Result&lt;()&gt; {
         <span class="self">self</span>.io.leave_multicast_v6(multiaddr, interface)
     }

     <span class="doccomment">/// Returns the value of the `SO_ERROR` option.
     ///
     /// # Examples
     /// ```
     /// use tokio::net::UdpSocket;
     /// use std::io;
     ///
     /// #[tokio::main]
     /// async fn main() -&gt; io::Result&lt;()&gt; {
     ///     // Create a socket
     ///     let socket = UdpSocket::bind(&quot;0.0.0.0:8080&quot;).await?;
     ///
     ///     if let Ok(Some(err)) = socket.take_error() {
     ///         println!(&quot;Got error: {:?}&quot;, err);
     ///     }
     ///
     ///     Ok(())
     /// }
     /// ```
     </span><span class="kw">pub fn </span>take_error(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; io::Result&lt;<span class="prelude-ty">Option</span>&lt;io::Error&gt;&gt; {
         <span class="self">self</span>.io.take_error()
     }
 }

 <span class="kw">impl </span>TryFrom&lt;std::net::UdpSocket&gt; <span class="kw">for </span>UdpSocket {
     <span class="kw">type </span>Error = io::Error;

     <span class="doccomment">/// Consumes stream, returning the tokio I/O object.
     ///
     /// This is equivalent to
     /// [`UdpSocket::from_std(stream)`](UdpSocket::from_std).
     </span><span class="kw">fn </span>try_from(stream: std::net::UdpSocket) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
         <span class="self">Self</span>::from_std(stream)
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>UdpSocket {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="self">self</span>.io.fmt(f)
     }
 }

 <span class="attribute">#[cfg(unix)]
 </span><span class="kw">mod </span>sys {
     <span class="kw">use </span><span class="kw">super</span>::UdpSocket;
     <span class="kw">use </span>std::os::unix::prelude::<span class="kw-2">*</span>;

     <span class="kw">impl </span>AsRawFd <span class="kw">for </span>UdpSocket {
         <span class="kw">fn </span>as_raw_fd(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; RawFd {
             <span class="self">self</span>.io.as_raw_fd()
         }
     }

     <span class="attribute">#[cfg(not(tokio_no_as_fd))]
     </span><span class="kw">impl </span>AsFd <span class="kw">for </span>UdpSocket {
         <span class="kw">fn </span>as_fd(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; BorrowedFd&lt;<span class="lifetime">&#39;_</span>&gt; {
             <span class="kw">unsafe </span>{ BorrowedFd::borrow_raw(<span class="self">self</span>.as_raw_fd()) }
         }
     }
 }

 <span class="macro">cfg_windows! </span>{
     <span class="kw">use </span><span class="kw">crate</span>::os::windows::io::{AsRawSocket, RawSocket};
     <span class="attribute">#[cfg(not(tokio_no_as_fd))]
     </span><span class="kw">use </span><span class="kw">crate</span>::os::windows::io::{AsSocket, BorrowedSocket};

     <span class="kw">impl </span>AsRawSocket <span class="kw">for </span>UdpSocket {
         <span class="kw">fn </span>as_raw_socket(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; RawSocket {
             <span class="self">self</span>.io.as_raw_socket()
         }
     }

     <span class="attribute">#[cfg(not(tokio_no_as_fd))]
     </span><span class="kw">impl </span>AsSocket <span class="kw">for </span>UdpSocket {
         <span class="kw">fn </span>as_socket(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; BorrowedSocket&lt;<span class="lifetime">&#39;_</span>&gt; {
             <span class="kw">unsafe </span>{ BorrowedSocket::borrow_raw(<span class="self">self</span>.as_raw_socket()) }
         }
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tokio" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>