Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1903 insertions, 0 deletions

diff --git a/third_party/rust/socket2/src/socket.rs b/third_party/rust/socket2/src/socket.rs
new file mode 100644
index 0000000000..87c143a3a6
--- /dev/null
+++ b/third_party/rust/socket2/src/socket.rs
@@ -0,0 +1,1903 @@
+// Copyright 2015 The Rust Project Developers.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::fmt;
+use std::io::{self, Read, Write};
+#[cfg(not(target_os = "redox"))]
+use std::io::{IoSlice, IoSliceMut};
+use std::mem::MaybeUninit;
+use std::net::{self, Ipv4Addr, Ipv6Addr, Shutdown};
+#[cfg(unix)]
+use std::os::unix::io::{FromRawFd, IntoRawFd};
+#[cfg(windows)]
+use std::os::windows::io::{FromRawSocket, IntoRawSocket};
+use std::time::Duration;
+
+use crate::sys::{self, c_int, getsockopt, setsockopt, Bool};
+use crate::{Domain, Protocol, SockAddr, TcpKeepalive, Type};
+#[cfg(not(target_os = "redox"))]
+use crate::{MaybeUninitSlice, RecvFlags};
+
+/// Owned wrapper around a system socket.
+///
+/// This type simply wraps an instance of a file descriptor (`c_int`) on Unix
+/// and an instance of `SOCKET` on Windows. This is the main type exported by
+/// this crate and is intended to mirror the raw semantics of sockets on
+/// platforms as closely as possible. Almost all methods correspond to
+/// precisely one libc or OS API call which is essentially just a "Rustic
+/// translation" of what's below.
+///
+/// ## Converting to and from other types
+///
+/// This type can be freely converted into the network primitives provided by
+/// the standard library, such as [`TcpStream`] or [`UdpSocket`], using the
+/// [`From`] trait, see the example below.
+///
+/// [`TcpStream`]: std::net::TcpStream
+/// [`UdpSocket`]: std::net::UdpSocket
+///
+/// # Notes
+///
+/// Some methods that set options on `Socket` require two system calls to set
+/// there options without overwriting previously set options. We do this by
+/// first getting the current settings, applying the desired changes and than
+/// updating the settings. This means that the operation is **not** atomic. This
+/// can lead to a data race when two threads are changing options in parallel.
+///
+/// # Examples
+/// ```no_run
+/// # fn main() -> std::io::Result<()> {
+/// use std::net::{SocketAddr, TcpListener};
+/// use socket2::{Socket, Domain, Type};
+///
+/// // create a TCP listener bound to two addresses
+/// let socket = Socket::new(Domain::IPV4, Type::STREAM, None)?;
+///
+/// let address: SocketAddr = "[::1]:12345".parse().unwrap();
+/// let address = address.into();
+/// socket.bind(&address)?;
+/// socket.bind(&address)?;
+/// socket.listen(128)?;
+///
+/// let listener: TcpListener = socket.into();
+/// // ...
+/// # drop(listener);
+/// # Ok(()) }
+/// ```
+pub struct Socket {
+    inner: Inner,
+}
+
+/// Store a `TcpStream` internally to take advantage of its niche optimizations on Unix platforms.
+pub(crate) type Inner = std::net::TcpStream;
+
+impl Socket {
+    /// # Safety
+    ///
+    /// The caller must ensure `raw` is a valid file descriptor/socket. NOTE:
+    /// this should really be marked `unsafe`, but this being an internal
+    /// function, often passed as mapping function, it's makes it very
+    /// inconvenient to mark it as `unsafe`.
+    pub(crate) fn from_raw(raw: sys::Socket) -> Socket {
+        Socket {
+            inner: unsafe {
+                // SAFETY: the caller must ensure that `raw` is a valid file
+                // descriptor, but when it isn't it could return I/O errors, or
+                // potentially close a fd it doesn't own. All of that isn't
+                // memory unsafe, so it's not desired but never memory unsafe or
+                // causes UB.
+                //
+                // However there is one exception. We use `TcpStream` to
+                // represent the `Socket` internally (see `Inner` type),
+                // `TcpStream` has a layout optimisation that doesn't allow for
+                // negative file descriptors (as those are always invalid).
+                // Violating this assumption (fd never negative) causes UB,
+                // something we don't want. So check for that we have this
+                // `assert!`.
+                #[cfg(unix)]
+                assert!(raw >= 0, "tried to create a `Socket` with an invalid fd");
+                sys::socket_from_raw(raw)
+            },
+        }
+    }
+
+    pub(crate) fn as_raw(&self) -> sys::Socket {
+        sys::socket_as_raw(&self.inner)
+    }
+
+    pub(crate) fn into_raw(self) -> sys::Socket {
+        sys::socket_into_raw(self.inner)
+    }
+
+    /// Creates a new socket and sets common flags.
+    ///
+    /// This function corresponds to `socket(2)` on Unix and `WSASocketW` on
+    /// Windows.
+    ///
+    /// On Unix-like systems, the close-on-exec flag is set on the new socket.
+    /// Additionally, on Apple platforms `SOCK_NOSIGPIPE` is set. On Windows,
+    /// the socket is made non-inheritable.
+    ///
+    /// [`Socket::new_raw`] can be used if you don't want these flags to be set.
+    pub fn new(domain: Domain, ty: Type, protocol: Option<Protocol>) -> io::Result<Socket> {
+        let ty = set_common_type(ty);
+        Socket::new_raw(domain, ty, protocol).and_then(set_common_flags)
+    }
+
+    /// Creates a new socket ready to be configured.
+    ///
+    /// This function corresponds to `socket(2)` on Unix and `WSASocketW` on
+    /// Windows and simply creates a new socket, no other configuration is done.
+    pub fn new_raw(domain: Domain, ty: Type, protocol: Option<Protocol>) -> io::Result<Socket> {
+        let protocol = protocol.map(|p| p.0).unwrap_or(0);
+        sys::socket(domain.0, ty.0, protocol).map(Socket::from_raw)
+    }
+
+    /// Creates a pair of sockets which are connected to each other.
+    ///
+    /// This function corresponds to `socketpair(2)`.
+    ///
+    /// This function sets the same flags as in done for [`Socket::new`],
+    /// [`Socket::pair_raw`] can be used if you don't want to set those flags.
+    #[cfg(any(doc, all(feature = "all", unix)))]
+    #[cfg_attr(docsrs, doc(cfg(all(feature = "all", unix))))]
+    pub fn pair(
+        domain: Domain,
+        ty: Type,
+        protocol: Option<Protocol>,
+    ) -> io::Result<(Socket, Socket)> {
+        let ty = set_common_type(ty);
+        let (a, b) = Socket::pair_raw(domain, ty, protocol)?;
+        let a = set_common_flags(a)?;
+        let b = set_common_flags(b)?;
+        Ok((a, b))
+    }
+
+    /// Creates a pair of sockets which are connected to each other.
+    ///
+    /// This function corresponds to `socketpair(2)`.
+    #[cfg(any(doc, all(feature = "all", unix)))]
+    #[cfg_attr(docsrs, doc(cfg(all(feature = "all", unix))))]
+    pub fn pair_raw(
+        domain: Domain,
+        ty: Type,
+        protocol: Option<Protocol>,
+    ) -> io::Result<(Socket, Socket)> {
+        let protocol = protocol.map(|p| p.0).unwrap_or(0);
+        sys::socketpair(domain.0, ty.0, protocol)
+            .map(|[a, b]| (Socket::from_raw(a), Socket::from_raw(b)))
+    }
+
+    /// Binds this socket to the specified address.
+    ///
+    /// This function directly corresponds to the `bind(2)` function on Windows
+    /// and Unix.
+    pub fn bind(&self, address: &SockAddr) -> io::Result<()> {
+        sys::bind(self.as_raw(), address)
+    }
+
+    /// Initiate a connection on this socket to the specified address.
+    ///
+    /// This function directly corresponds to the `connect(2)` function on
+    /// Windows and Unix.
+    ///
+    /// An error will be returned if `listen` or `connect` has already been
+    /// called on this builder.
+    ///
+    /// # Notes
+    ///
+    /// When using a non-blocking connect (by setting the socket into
+    /// non-blocking mode before calling this function), socket option can't be
+    /// set *while connecting*. This will cause errors on Windows. Socket
+    /// options can be safely set before and after connecting the socket.
+    pub fn connect(&self, address: &SockAddr) -> io::Result<()> {
+        sys::connect(self.as_raw(), address)
+    }
+
+    /// Initiate a connection on this socket to the specified address, only
+    /// only waiting for a certain period of time for the connection to be
+    /// established.
+    ///
+    /// Unlike many other methods on `Socket`, this does *not* correspond to a
+    /// single C function. It sets the socket to nonblocking mode, connects via
+    /// connect(2), and then waits for the connection to complete with poll(2)
+    /// on Unix and select on Windows. When the connection is complete, the
+    /// socket is set back to blocking mode. On Unix, this will loop over
+    /// `EINTR` errors.
+    ///
+    /// # Warnings
+    ///
+    /// The non-blocking state of the socket is overridden by this function -
+    /// it will be returned in blocking mode on success, and in an indeterminate
+    /// state on failure.
+    ///
+    /// If the connection request times out, it may still be processing in the
+    /// background - a second call to `connect` or `connect_timeout` may fail.
+    pub fn connect_timeout(&self, addr: &SockAddr, timeout: Duration) -> io::Result<()> {
+        self.set_nonblocking(true)?;
+        let res = self.connect(addr);
+        self.set_nonblocking(false)?;
+
+        match res {
+            Ok(()) => return Ok(()),
+            Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {}
+            #[cfg(unix)]
+            Err(ref e) if e.raw_os_error() == Some(libc::EINPROGRESS) => {}
+            Err(e) => return Err(e),
+        }
+
+        sys::poll_connect(self, timeout)
+    }
+
+    /// Mark a socket as ready to accept incoming connection requests using
+    /// [`Socket::accept()`].
+    ///
+    /// This function directly corresponds to the `listen(2)` function on
+    /// Windows and Unix.
+    ///
+    /// An error will be returned if `listen` or `connect` has already been
+    /// called on this builder.
+    pub fn listen(&self, backlog: c_int) -> io::Result<()> {
+        sys::listen(self.as_raw(), backlog)
+    }
+
+    /// Accept a new incoming connection from this listener.
+    ///
+    /// This function uses `accept4(2)` on platforms that support it and
+    /// `accept(2)` platforms that do not.
+    ///
+    /// This function sets the same flags as in done for [`Socket::new`],
+    /// [`Socket::accept_raw`] can be used if you don't want to set those flags.
+    pub fn accept(&self) -> io::Result<(Socket, SockAddr)> {
+        // Use `accept4` on platforms that support it.
+        #[cfg(any(
+            target_os = "android",
+            target_os = "dragonfly",
+            target_os = "freebsd",
+            target_os = "fuchsia",
+            target_os = "illumos",
+            target_os = "linux",
+            target_os = "netbsd",
+            target_os = "openbsd",
+        ))]
+        return self._accept4(libc::SOCK_CLOEXEC);
+
+        // Fall back to `accept` on platforms that do not support `accept4`.
+        #[cfg(not(any(
+            target_os = "android",
+            target_os = "dragonfly",
+            target_os = "freebsd",
+            target_os = "fuchsia",
+            target_os = "illumos",
+            target_os = "linux",
+            target_os = "netbsd",
+            target_os = "openbsd",
+        )))]
+        {
+            let (socket, addr) = self.accept_raw()?;
+            let socket = set_common_flags(socket)?;
+            // `set_common_flags` does not disable inheritance on Windows because `Socket::new`
+            // unlike `accept` is able to create the socket with inheritance disabled.
+            #[cfg(windows)]
+            socket._set_no_inherit(true)?;
+            Ok((socket, addr))
+        }
+    }
+
+    /// Accept a new incoming connection from this listener.
+    ///
+    /// This function directly corresponds to the `accept(2)` function on
+    /// Windows and Unix.
+    pub fn accept_raw(&self) -> io::Result<(Socket, SockAddr)> {
+        sys::accept(self.as_raw()).map(|(inner, addr)| (Socket::from_raw(inner), addr))
+    }
+
+    /// Returns the socket address of the local half of this socket.
+    ///
+    /// # Notes
+    ///
+    /// Depending on the OS this may return an error if the socket is not
+    /// [bound].
+    ///
+    /// [bound]: Socket::bind
+    pub fn local_addr(&self) -> io::Result<SockAddr> {
+        sys::getsockname(self.as_raw())
+    }
+
+    /// Returns the socket address of the remote peer of this socket.
+    ///
+    /// # Notes
+    ///
+    /// This returns an error if the socket is not [`connect`ed].
+    ///
+    /// [`connect`ed]: Socket::connect
+    pub fn peer_addr(&self) -> io::Result<SockAddr> {
+        sys::getpeername(self.as_raw())
+    }
+
+    /// Returns the [`Type`] of this socket by checking the `SO_TYPE` option on
+    /// this socket.
+    pub fn r#type(&self) -> io::Result<Type> {
+        unsafe { getsockopt::<c_int>(self.as_raw(), sys::SOL_SOCKET, sys::SO_TYPE).map(Type) }
+    }
+
+    /// Creates a new independently owned handle to the underlying socket.
+    ///
+    /// # Notes
+    ///
+    /// On Unix this uses `F_DUPFD_CLOEXEC` and thus sets the `FD_CLOEXEC` on
+    /// the returned socket.
+    ///
+    /// On Windows this uses `WSA_FLAG_NO_HANDLE_INHERIT` setting inheriting to
+    /// false.
+    ///
+    /// On Windows this can **not** be used function cannot be used on a
+    /// QOS-enabled socket, see
+    /// <https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsaduplicatesocketw>.
+    pub fn try_clone(&self) -> io::Result<Socket> {
+        sys::try_clone(self.as_raw()).map(Socket::from_raw)
+    }
+
+    /// Moves this TCP stream into or out of nonblocking mode.
+    ///
+    /// # Notes
+    ///
+    /// On Unix this corresponds to calling `fcntl` (un)setting `O_NONBLOCK`.
+    ///
+    /// On Windows this corresponds to calling `ioctlsocket` (un)setting
+    /// `FIONBIO`.
+    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
+        sys::set_nonblocking(self.as_raw(), nonblocking)
+    }
+
+    /// Shuts down the read, write, or both halves of this connection.
+    ///
+    /// This function will cause all pending and future I/O on the specified
+    /// portions to return immediately with an appropriate value.
+    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
+        sys::shutdown(self.as_raw(), how)
+    }
+
+    /// Receives data on the socket from the remote address to which it is
+    /// connected.
+    ///
+    /// The [`connect`] method will connect this socket to a remote address.
+    /// This method might fail if the socket is not connected.
+    ///
+    /// [`connect`]: Socket::connect
+    ///
+    /// # Safety
+    ///
+    /// Normally casting a `&mut [u8]` to `&mut [MaybeUninit<u8>]` would be
+    /// unsound, as that allows us to write uninitialised bytes to the buffer.
+    /// However this implementation promises to not write uninitialised bytes to
+    /// the `buf`fer and passes it directly to `recv(2)` system call. This
+    /// promise ensures that this function can be called using a `buf`fer of
+    /// type `&mut [u8]`.
+    ///
+    /// Note that the [`io::Read::read`] implementation calls this function with
+    /// a `buf`fer of type `&mut [u8]`, allowing initialised buffers to be used
+    /// without using `unsafe`.
+    pub fn recv(&self, buf: &mut [MaybeUninit<u8>]) -> io::Result<usize> {
+        self.recv_with_flags(buf, 0)
+    }
+
+    /// Receives out-of-band (OOB) data on the socket from the remote address to
+    /// which it is connected by setting the `MSG_OOB` flag for this call.
+    ///
+    /// For more information, see [`recv`], [`out_of_band_inline`].
+    ///
+    /// [`recv`]: Socket::recv
+    /// [`out_of_band_inline`]: Socket::out_of_band_inline
+    pub fn recv_out_of_band(&self, buf: &mut [MaybeUninit<u8>]) -> io::Result<usize> {
+        self.recv_with_flags(buf, sys::MSG_OOB)
+    }
+
+    /// Identical to [`recv`] but allows for specification of arbitrary flags to
+    /// the underlying `recv` call.
+    ///
+    /// [`recv`]: Socket::recv
+    pub fn recv_with_flags(
+        &self,
+        buf: &mut [MaybeUninit<u8>],
+        flags: sys::c_int,
+    ) -> io::Result<usize> {
+        sys::recv(self.as_raw(), buf, flags)
+    }
+
+    /// Receives data on the socket from the remote address to which it is
+    /// connected. Unlike [`recv`] this allows passing multiple buffers.
+    ///
+    /// The [`connect`] method will connect this socket to a remote address.
+    /// This method might fail if the socket is not connected.
+    ///
+    /// In addition to the number of bytes read, this function returns the flags
+    /// for the received message. See [`RecvFlags`] for more information about
+    /// the returned flags.
+    ///
+    /// [`recv`]: Socket::recv
+    /// [`connect`]: Socket::connect
+    ///
+    /// # Safety
+    ///
+    /// Normally casting a `IoSliceMut` to `MaybeUninitSlice` would be unsound,
+    /// as that allows us to write uninitialised bytes to the buffer. However
+    /// this implementation promises to not write uninitialised bytes to the
+    /// `bufs` and passes it directly to `recvmsg(2)` system call. This promise
+    /// ensures that this function can be called using `bufs` of type `&mut
+    /// [IoSliceMut]`.
+    ///
+    /// Note that the [`io::Read::read_vectored`] implementation calls this
+    /// function with `buf`s of type `&mut [IoSliceMut]`, allowing initialised
+    /// buffers to be used without using `unsafe`.
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn recv_vectored(
+        &self,
+        bufs: &mut [MaybeUninitSlice<'_>],
+    ) -> io::Result<(usize, RecvFlags)> {
+        self.recv_vectored_with_flags(bufs, 0)
+    }
+
+    /// Identical to [`recv_vectored`] but allows for specification of arbitrary
+    /// flags to the underlying `recvmsg`/`WSARecv` call.
+    ///
+    /// [`recv_vectored`]: Socket::recv_vectored
+    ///
+    /// # Safety
+    ///
+    /// `recv_from_vectored` makes the same safety guarantees regarding `bufs`
+    /// as [`recv_vectored`].
+    ///
+    /// [`recv_vectored`]: Socket::recv_vectored
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn recv_vectored_with_flags(
+        &self,
+        bufs: &mut [MaybeUninitSlice<'_>],
+        flags: c_int,
+    ) -> io::Result<(usize, RecvFlags)> {
+        sys::recv_vectored(self.as_raw(), bufs, flags)
+    }
+
+    /// Receives data on the socket from the remote adress to which it is
+    /// connected, without removing that data from the queue. On success,
+    /// returns the number of bytes peeked.
+    ///
+    /// Successive calls return the same data. This is accomplished by passing
+    /// `MSG_PEEK` as a flag to the underlying `recv` system call.
+    ///
+    /// # Safety
+    ///
+    /// `peek` makes the same safety guarantees regarding the `buf`fer as
+    /// [`recv`].
+    ///
+    /// [`recv`]: Socket::recv
+    pub fn peek(&self, buf: &mut [MaybeUninit<u8>]) -> io::Result<usize> {
+        self.recv_with_flags(buf, sys::MSG_PEEK)
+    }
+
+    /// Receives data from the socket. On success, returns the number of bytes
+    /// read and the address from whence the data came.
+    ///
+    /// # Safety
+    ///
+    /// `recv_from` makes the same safety guarantees regarding the `buf`fer as
+    /// [`recv`].
+    ///
+    /// [`recv`]: Socket::recv
+    pub fn recv_from(&self, buf: &mut [MaybeUninit<u8>]) -> io::Result<(usize, SockAddr)> {
+        self.recv_from_with_flags(buf, 0)
+    }
+
+    /// Identical to [`recv_from`] but allows for specification of arbitrary
+    /// flags to the underlying `recvfrom` call.
+    ///
+    /// [`recv_from`]: Socket::recv_from
+    pub fn recv_from_with_flags(
+        &self,
+        buf: &mut [MaybeUninit<u8>],
+        flags: c_int,
+    ) -> io::Result<(usize, SockAddr)> {
+        sys::recv_from(self.as_raw(), buf, flags)
+    }
+
+    /// Receives data from the socket. Returns the amount of bytes read, the
+    /// [`RecvFlags`] and the remote address from the data is coming. Unlike
+    /// [`recv_from`] this allows passing multiple buffers.
+    ///
+    /// [`recv_from`]: Socket::recv_from
+    ///
+    /// # Safety
+    ///
+    /// `recv_from_vectored` makes the same safety guarantees regarding `bufs`
+    /// as [`recv_vectored`].
+    ///
+    /// [`recv_vectored`]: Socket::recv_vectored
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn recv_from_vectored(
+        &self,
+        bufs: &mut [MaybeUninitSlice<'_>],
+    ) -> io::Result<(usize, RecvFlags, SockAddr)> {
+        self.recv_from_vectored_with_flags(bufs, 0)
+    }
+
+    /// Identical to [`recv_from_vectored`] but allows for specification of
+    /// arbitrary flags to the underlying `recvmsg`/`WSARecvFrom` call.
+    ///
+    /// [`recv_from_vectored`]: Socket::recv_from_vectored
+    ///
+    /// # Safety
+    ///
+    /// `recv_from_vectored` makes the same safety guarantees regarding `bufs`
+    /// as [`recv_vectored`].
+    ///
+    /// [`recv_vectored`]: Socket::recv_vectored
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn recv_from_vectored_with_flags(
+        &self,
+        bufs: &mut [MaybeUninitSlice<'_>],
+        flags: c_int,
+    ) -> io::Result<(usize, RecvFlags, SockAddr)> {
+        sys::recv_from_vectored(self.as_raw(), bufs, flags)
+    }
+
+    /// Receives data from the socket, without removing it from the queue.
+    ///
+    /// Successive calls return the same data. This is accomplished by passing
+    /// `MSG_PEEK` as a flag to the underlying `recvfrom` system call.
+    ///
+    /// On success, returns the number of bytes peeked and the address from
+    /// whence the data came.
+    ///
+    /// # Safety
+    ///
+    /// `peek_from` makes the same safety guarantees regarding the `buf`fer as
+    /// [`recv`].
+    ///
+    /// [`recv`]: Socket::recv
+    pub fn peek_from(&self, buf: &mut [MaybeUninit<u8>]) -> io::Result<(usize, SockAddr)> {
+        self.recv_from_with_flags(buf, sys::MSG_PEEK)
+    }
+
+    /// Sends data on the socket to a connected peer.
+    ///
+    /// This is typically used on TCP sockets or datagram sockets which have
+    /// been connected.
+    ///
+    /// On success returns the number of bytes that were sent.
+    pub fn send(&self, buf: &[u8]) -> io::Result<usize> {
+        self.send_with_flags(buf, 0)
+    }
+
+    /// Identical to [`send`] but allows for specification of arbitrary flags to the underlying
+    /// `send` call.
+    ///
+    /// [`send`]: #method.send
+    pub fn send_with_flags(&self, buf: &[u8], flags: c_int) -> io::Result<usize> {
+        sys::send(self.as_raw(), buf, flags)
+    }
+
+    /// Send data to the connected peer. Returns the amount of bytes written.
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn send_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        self.send_vectored_with_flags(bufs, 0)
+    }
+
+    /// Identical to [`send_vectored`] but allows for specification of arbitrary
+    /// flags to the underlying `sendmsg`/`WSASend` call.
+    ///
+    /// [`send_vectored`]: Socket::send_vectored
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn send_vectored_with_flags(
+        &self,
+        bufs: &[IoSlice<'_>],
+        flags: c_int,
+    ) -> io::Result<usize> {
+        sys::send_vectored(self.as_raw(), bufs, flags)
+    }
+
+    /// Sends out-of-band (OOB) data on the socket to connected peer
+    /// by setting the `MSG_OOB` flag for this call.
+    ///
+    /// For more information, see [`send`], [`out_of_band_inline`].
+    ///
+    /// [`send`]: #method.send
+    /// [`out_of_band_inline`]: #method.out_of_band_inline
+    pub fn send_out_of_band(&self, buf: &[u8]) -> io::Result<usize> {
+        self.send_with_flags(buf, sys::MSG_OOB)
+    }
+
+    /// Sends data on the socket to the given address. On success, returns the
+    /// number of bytes written.
+    ///
+    /// This is typically used on UDP or datagram-oriented sockets.
+    pub fn send_to(&self, buf: &[u8], addr: &SockAddr) -> io::Result<usize> {
+        self.send_to_with_flags(buf, addr, 0)
+    }
+
+    /// Identical to [`send_to`] but allows for specification of arbitrary flags
+    /// to the underlying `sendto` call.
+    ///
+    /// [`send_to`]: Socket::send_to
+    pub fn send_to_with_flags(
+        &self,
+        buf: &[u8],
+        addr: &SockAddr,
+        flags: c_int,
+    ) -> io::Result<usize> {
+        sys::send_to(self.as_raw(), buf, addr, flags)
+    }
+
+    /// Send data to a peer listening on `addr`. Returns the amount of bytes
+    /// written.
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn send_to_vectored(&self, bufs: &[IoSlice<'_>], addr: &SockAddr) -> io::Result<usize> {
+        self.send_to_vectored_with_flags(bufs, addr, 0)
+    }
+
+    /// Identical to [`send_to_vectored`] but allows for specification of
+    /// arbitrary flags to the underlying `sendmsg`/`WSASendTo` call.
+    ///
+    /// [`send_to_vectored`]: Socket::send_to_vectored
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn send_to_vectored_with_flags(
+        &self,
+        bufs: &[IoSlice<'_>],
+        addr: &SockAddr,
+        flags: c_int,
+    ) -> io::Result<usize> {
+        sys::send_to_vectored(self.as_raw(), bufs, addr, flags)
+    }
+}
+
+/// Set `SOCK_CLOEXEC` and `NO_HANDLE_INHERIT` on the `ty`pe on platforms that
+/// support it.
+#[inline(always)]
+fn set_common_type(ty: Type) -> Type {
+    // On platforms that support it set `SOCK_CLOEXEC`.
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "fuchsia",
+        target_os = "illumos",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    let ty = ty._cloexec();
+
+    // On windows set `NO_HANDLE_INHERIT`.
+    #[cfg(windows)]
+    let ty = ty._no_inherit();
+
+    ty
+}
+
+/// Set `FD_CLOEXEC` and `NOSIGPIPE` on the `socket` for platforms that need it.
+#[inline(always)]
+#[allow(clippy::unnecessary_wraps)]
+fn set_common_flags(socket: Socket) -> io::Result<Socket> {
+    // On platforms that don't have `SOCK_CLOEXEC` use `FD_CLOEXEC`.
+    #[cfg(all(
+        unix,
+        not(any(
+            target_os = "android",
+            target_os = "dragonfly",
+            target_os = "freebsd",
+            target_os = "fuchsia",
+            target_os = "illumos",
+            target_os = "linux",
+            target_os = "netbsd",
+            target_os = "openbsd",
+        ))
+    ))]
+    socket._set_cloexec(true)?;
+
+    // On Apple platforms set `NOSIGPIPE`.
+    #[cfg(target_vendor = "apple")]
+    socket._set_nosigpipe(true)?;
+
+    Ok(socket)
+}
+
+/// A local interface specified by its index or an address assigned to it.
+///
+/// `Index(0)` and `Address(Ipv4Addr::UNSPECIFIED)` are equivalent and indicate
+/// that an appropriate interface should be selected by the system.
+#[cfg(not(any(
+    target_os = "haiku",
+    target_os = "illumos",
+    target_os = "netbsd",
+    target_os = "redox",
+    target_os = "solaris",
+)))]
+#[derive(Debug)]
+pub enum InterfaceIndexOrAddress {
+    /// An interface index.
+    Index(u32),
+    /// An address assigned to an interface.
+    Address(Ipv4Addr),
+}
+
+/// Socket options get/set using `SOL_SOCKET`.
+///
+/// Additional documentation can be found in documentation of the OS.
+/// * Linux: <https://man7.org/linux/man-pages/man7/socket.7.html>
+/// * Windows: <https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options>
+impl Socket {
+    /// Get the value of the `SO_BROADCAST` option for this socket.
+    ///
+    /// For more information about this option, see [`set_broadcast`].
+    ///
+    /// [`set_broadcast`]: Socket::set_broadcast
+    pub fn broadcast(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::SOL_SOCKET, sys::SO_BROADCAST)
+                .map(|broadcast| broadcast != 0)
+        }
+    }
+
+    /// Set the value of the `SO_BROADCAST` option for this socket.
+    ///
+    /// When enabled, this socket is allowed to send packets to a broadcast
+    /// address.
+    pub fn set_broadcast(&self, broadcast: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::SOL_SOCKET,
+                sys::SO_BROADCAST,
+                broadcast as c_int,
+            )
+        }
+    }
+
+    /// Get the value of the `SO_ERROR` option on this socket.
+    ///
+    /// This will retrieve the stored error in the underlying socket, clearing
+    /// the field in the process. This can be useful for checking errors between
+    /// calls.
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        match unsafe { getsockopt::<c_int>(self.as_raw(), sys::SOL_SOCKET, sys::SO_ERROR) } {
+            Ok(0) => Ok(None),
+            Ok(errno) => Ok(Some(io::Error::from_raw_os_error(errno))),
+            Err(err) => Err(err),
+        }
+    }
+
+    /// Get the value of the `SO_KEEPALIVE` option on this socket.
+    ///
+    /// For more information about this option, see [`set_keepalive`].
+    ///
+    /// [`set_keepalive`]: Socket::set_keepalive
+    pub fn keepalive(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<Bool>(self.as_raw(), sys::SOL_SOCKET, sys::SO_KEEPALIVE)
+                .map(|keepalive| keepalive != 0)
+        }
+    }
+
+    /// Set value for the `SO_KEEPALIVE` option on this socket.
+    ///
+    /// Enable sending of keep-alive messages on connection-oriented sockets.
+    pub fn set_keepalive(&self, keepalive: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::SOL_SOCKET,
+                sys::SO_KEEPALIVE,
+                keepalive as c_int,
+            )
+        }
+    }
+
+    /// Get the value of the `SO_LINGER` option on this socket.
+    ///
+    /// For more information about this option, see [`set_linger`].
+    ///
+    /// [`set_linger`]: Socket::set_linger
+    pub fn linger(&self) -> io::Result<Option<Duration>> {
+        unsafe {
+            getsockopt::<sys::linger>(self.as_raw(), sys::SOL_SOCKET, sys::SO_LINGER)
+                .map(from_linger)
+        }
+    }
+
+    /// Set value for the `SO_LINGER` option on this socket.
+    ///
+    /// If `linger` is not `None`, a close(2) or shutdown(2) will not return
+    /// until all queued messages for the socket have been successfully sent or
+    /// the linger timeout has been reached. Otherwise, the call returns
+    /// immediately and the closing is done in the background. When the socket
+    /// is closed as part of exit(2), it always lingers in the background.
+    ///
+    /// # Notes
+    ///
+    /// On most OSs the duration only has a precision of seconds and will be
+    /// silently truncated.
+    ///
+    /// On Apple platforms (e.g. macOS, iOS, etc) this uses `SO_LINGER_SEC`.
+    pub fn set_linger(&self, linger: Option<Duration>) -> io::Result<()> {
+        let linger = into_linger(linger);
+        unsafe { setsockopt(self.as_raw(), sys::SOL_SOCKET, sys::SO_LINGER, linger) }
+    }
+
+    /// Get value for the `SO_OOBINLINE` option on this socket.
+    ///
+    /// For more information about this option, see [`set_out_of_band_inline`].
+    ///
+    /// [`set_out_of_band_inline`]: Socket::set_out_of_band_inline
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn out_of_band_inline(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::SOL_SOCKET, sys::SO_OOBINLINE)
+                .map(|oob_inline| oob_inline != 0)
+        }
+    }
+
+    /// Set value for the `SO_OOBINLINE` option on this socket.
+    ///
+    /// If this option is enabled, out-of-band data is directly placed into the
+    /// receive data stream. Otherwise, out-of-band data is passed only when the
+    /// `MSG_OOB` flag is set during receiving. As per RFC6093, TCP sockets
+    /// using the Urgent mechanism are encouraged to set this flag.
+    #[cfg(not(target_os = "redox"))]
+    #[cfg_attr(docsrs, doc(cfg(not(target_os = "redox"))))]
+    pub fn set_out_of_band_inline(&self, oob_inline: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::SOL_SOCKET,
+                sys::SO_OOBINLINE,
+                oob_inline as c_int,
+            )
+        }
+    }
+
+    /// Get value for the `SO_RCVBUF` option on this socket.
+    ///
+    /// For more information about this option, see [`set_recv_buffer_size`].
+    ///
+    /// [`set_recv_buffer_size`]: Socket::set_recv_buffer_size
+    pub fn recv_buffer_size(&self) -> io::Result<usize> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::SOL_SOCKET, sys::SO_RCVBUF)
+                .map(|size| size as usize)
+        }
+    }
+
+    /// Set value for the `SO_RCVBUF` option on this socket.
+    ///
+    /// Changes the size of the operating system's receive buffer associated
+    /// with the socket.
+    pub fn set_recv_buffer_size(&self, size: usize) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::SOL_SOCKET,
+                sys::SO_RCVBUF,
+                size as c_int,
+            )
+        }
+    }
+
+    /// Get value for the `SO_RCVTIMEO` option on this socket.
+    ///
+    /// If the returned timeout is `None`, then `read` and `recv` calls will
+    /// block indefinitely.
+    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
+        sys::timeout_opt(self.as_raw(), sys::SOL_SOCKET, sys::SO_RCVTIMEO)
+    }
+
+    /// Set value for the `SO_RCVTIMEO` option on this socket.
+    ///
+    /// If `timeout` is `None`, then `read` and `recv` calls will block
+    /// indefinitely.
+    pub fn set_read_timeout(&self, duration: Option<Duration>) -> io::Result<()> {
+        sys::set_timeout_opt(self.as_raw(), sys::SOL_SOCKET, sys::SO_RCVTIMEO, duration)
+    }
+
+    /// Get the value of the `SO_REUSEADDR` option on this socket.
+    ///
+    /// For more information about this option, see [`set_reuse_address`].
+    ///
+    /// [`set_reuse_address`]: Socket::set_reuse_address
+    pub fn reuse_address(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::SOL_SOCKET, sys::SO_REUSEADDR)
+                .map(|reuse| reuse != 0)
+        }
+    }
+
+    /// Set value for the `SO_REUSEADDR` option on this socket.
+    ///
+    /// This indicates that futher calls to `bind` may allow reuse of local
+    /// addresses. For IPv4 sockets this means that a socket may bind even when
+    /// there's a socket already listening on this port.
+    pub fn set_reuse_address(&self, reuse: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::SOL_SOCKET,
+                sys::SO_REUSEADDR,
+                reuse as c_int,
+            )
+        }
+    }
+
+    /// Get the value of the `SO_SNDBUF` option on this socket.
+    ///
+    /// For more information about this option, see [`set_send_buffer_size`].
+    ///
+    /// [`set_send_buffer_size`]: Socket::set_send_buffer_size
+    pub fn send_buffer_size(&self) -> io::Result<usize> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::SOL_SOCKET, sys::SO_SNDBUF)
+                .map(|size| size as usize)
+        }
+    }
+
+    /// Set value for the `SO_SNDBUF` option on this socket.
+    ///
+    /// Changes the size of the operating system's send buffer associated with
+    /// the socket.
+    pub fn set_send_buffer_size(&self, size: usize) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::SOL_SOCKET,
+                sys::SO_SNDBUF,
+                size as c_int,
+            )
+        }
+    }
+
+    /// Get value for the `SO_SNDTIMEO` option on this socket.
+    ///
+    /// If the returned timeout is `None`, then `write` and `send` calls will
+    /// block indefinitely.
+    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
+        sys::timeout_opt(self.as_raw(), sys::SOL_SOCKET, sys::SO_SNDTIMEO)
+    }
+
+    /// Set value for the `SO_SNDTIMEO` option on this socket.
+    ///
+    /// If `timeout` is `None`, then `write` and `send` calls will block
+    /// indefinitely.
+    pub fn set_write_timeout(&self, duration: Option<Duration>) -> io::Result<()> {
+        sys::set_timeout_opt(self.as_raw(), sys::SOL_SOCKET, sys::SO_SNDTIMEO, duration)
+    }
+}
+
+fn from_linger(linger: sys::linger) -> Option<Duration> {
+    if linger.l_onoff == 0 {
+        None
+    } else {
+        Some(Duration::from_secs(linger.l_linger as u64))
+    }
+}
+
+fn into_linger(duration: Option<Duration>) -> sys::linger {
+    match duration {
+        Some(duration) => sys::linger {
+            l_onoff: 1,
+            l_linger: duration.as_secs() as _,
+        },
+        None => sys::linger {
+            l_onoff: 0,
+            l_linger: 0,
+        },
+    }
+}
+
+/// Socket options for IPv4 sockets, get/set using `IPPROTO_IP`.
+///
+/// Additional documentation can be found in documentation of the OS.
+/// * Linux: <https://man7.org/linux/man-pages/man7/ip.7.html>
+/// * Windows: <https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options>
+impl Socket {
+    /// Get the value of the `IP_HDRINCL` option on this socket.
+    ///
+    /// For more information about this option, see [`set_header_included`].
+    ///
+    /// [`set_header_included`]: Socket::set_header_included
+    #[cfg(all(feature = "all", not(target_os = "redox")))]
+    #[cfg_attr(docsrs, doc(all(feature = "all", not(target_os = "redox"))))]
+    pub fn header_included(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IP, sys::IP_HDRINCL)
+                .map(|included| included != 0)
+        }
+    }
+
+    /// Set the value of the `IP_HDRINCL` option on this socket.
+    ///
+    /// If enabled, the user supplies an IP header in front of the user data.
+    /// Valid only for [`SOCK_RAW`] sockets; see [raw(7)] for more information.
+    /// When this flag is enabled, the values set by `IP_OPTIONS`, [`IP_TTL`],
+    /// and [`IP_TOS`] are ignored.
+    ///
+    /// [`SOCK_RAW`]: Type::RAW
+    /// [raw(7)]: https://man7.org/linux/man-pages/man7/raw.7.html
+    /// [`IP_TTL`]: Socket::set_ttl
+    /// [`IP_TOS`]: Socket::set_tos
+    #[cfg(all(feature = "all", not(target_os = "redox")))]
+    #[cfg_attr(docsrs, doc(all(feature = "all", not(target_os = "redox"))))]
+    pub fn set_header_included(&self, included: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_HDRINCL,
+                included as c_int,
+            )
+        }
+    }
+
+    /// Get the value of the `IP_TRANSPARENT` option on this socket.
+    ///
+    /// For more information about this option, see [`set_ip_transparent`].
+    ///
+    /// [`set_ip_transparent`]: Socket::set_ip_transparent
+    #[cfg(any(doc, all(feature = "all", target_os = "linux")))]
+    #[cfg_attr(docsrs, doc(cfg(all(feature = "all", target_os = "linux"))))]
+    pub fn ip_transparent(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IP, libc::IP_TRANSPARENT)
+                .map(|transparent| transparent != 0)
+        }
+    }
+
+    /// Set the value of the `IP_TRANSPARENT` option on this socket.
+    ///
+    /// Setting this boolean option enables transparent proxying
+    /// on this socket.  This socket option allows the calling
+    /// application to bind to a nonlocal IP address and operate
+    /// both as a client and a server with the foreign address as
+    /// the local endpoint.  NOTE: this requires that routing be
+    /// set up in a way that packets going to the foreign address
+    /// are routed through the TProxy box (i.e., the system
+    /// hosting the application that employs the IP_TRANSPARENT
+    /// socket option).  Enabling this socket option requires
+    /// superuser privileges (the `CAP_NET_ADMIN` capability).
+    ///
+    /// TProxy redirection with the iptables TPROXY target also
+    /// requires that this option be set on the redirected socket.
+    #[cfg(any(doc, all(feature = "all", target_os = "linux")))]
+    #[cfg_attr(docsrs, doc(cfg(all(feature = "all", target_os = "linux"))))]
+    pub fn set_ip_transparent(&self, transparent: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                libc::IP_TRANSPARENT,
+                transparent as c_int,
+            )
+        }
+    }
+
+    /// Join a multicast group using `IP_ADD_MEMBERSHIP` option on this socket.
+    ///
+    /// 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's [`Ipv4Addr::UNSPECIFIED`] (`INADDR_ANY`) then
+    /// an appropriate interface is chosen by the system.
+    pub fn join_multicast_v4(&self, multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> io::Result<()> {
+        let mreq = sys::IpMreq {
+            imr_multiaddr: sys::to_in_addr(multiaddr),
+            imr_interface: sys::to_in_addr(interface),
+        };
+        unsafe { setsockopt(self.as_raw(), sys::IPPROTO_IP, sys::IP_ADD_MEMBERSHIP, mreq) }
+    }
+
+    /// Leave a multicast group using `IP_DROP_MEMBERSHIP` option on this socket.
+    ///
+    /// For more information about this option, see [`join_multicast_v4`].
+    ///
+    /// [`join_multicast_v4`]: Socket::join_multicast_v4
+    pub fn leave_multicast_v4(&self, multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> io::Result<()> {
+        let mreq = sys::IpMreq {
+            imr_multiaddr: sys::to_in_addr(multiaddr),
+            imr_interface: sys::to_in_addr(interface),
+        };
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_DROP_MEMBERSHIP,
+                mreq,
+            )
+        }
+    }
+
+    /// Join a multicast group using `IP_ADD_MEMBERSHIP` option on this socket.
+    ///
+    /// This function specifies a new multicast group for this socket to join.
+    /// The address must be a valid multicast address, and `interface` specifies
+    /// the local interface with which the system should join the multicast
+    /// group. See [`InterfaceIndexOrAddress`].
+    #[cfg(not(any(
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox",
+        target_os = "solaris",
+    )))]
+    pub fn join_multicast_v4_n(
+        &self,
+        multiaddr: &Ipv4Addr,
+        interface: &InterfaceIndexOrAddress,
+    ) -> io::Result<()> {
+        let mreqn = sys::to_mreqn(multiaddr, interface);
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_ADD_MEMBERSHIP,
+                mreqn,
+            )
+        }
+    }
+
+    /// Leave a multicast group using `IP_DROP_MEMBERSHIP` option on this socket.
+    ///
+    /// For more information about this option, see [`join_multicast_v4_n`].
+    ///
+    /// [`join_multicast_v4_n`]: Socket::join_multicast_v4_n
+    #[cfg(not(any(
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox",
+        target_os = "solaris",
+    )))]
+    pub fn leave_multicast_v4_n(
+        &self,
+        multiaddr: &Ipv4Addr,
+        interface: &InterfaceIndexOrAddress,
+    ) -> io::Result<()> {
+        let mreqn = sys::to_mreqn(multiaddr, interface);
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_DROP_MEMBERSHIP,
+                mreqn,
+            )
+        }
+    }
+
+    /// Join a multicast SSM channel using `IP_ADD_SOURCE_MEMBERSHIP` option on this socket.
+    ///
+    /// This function specifies a new multicast channel for this socket to join.
+    /// The group must be a valid SSM group address, the source must be the address of the sender
+    /// and `interface` is the address of the local interface with which the system should join the
+    /// multicast group. If it's [`Ipv4Addr::UNSPECIFIED`] (`INADDR_ANY`) then
+    /// an appropriate interface is chosen by the system.
+    #[cfg(not(any(
+        target_os = "dragonfly",
+        target_os = "haiku",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox",
+        target_os = "fuchsia",
+    )))]
+    pub fn join_ssm_v4(
+        &self,
+        source: &Ipv4Addr,
+        group: &Ipv4Addr,
+        interface: &Ipv4Addr,
+    ) -> io::Result<()> {
+        let mreqs = sys::IpMreqSource {
+            imr_multiaddr: sys::to_in_addr(group),
+            imr_interface: sys::to_in_addr(interface),
+            imr_sourceaddr: sys::to_in_addr(source),
+        };
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_ADD_SOURCE_MEMBERSHIP,
+                mreqs,
+            )
+        }
+    }
+
+    /// Leave a multicast group using `IP_DROP_SOURCE_MEMBERSHIP` option on this socket.
+    ///
+    /// For more information about this option, see [`join_ssm_v4`].
+    ///
+    /// [`join_ssm_v4`]: Socket::join_ssm_v4
+    #[cfg(not(any(
+        target_os = "dragonfly",
+        target_os = "haiku",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox",
+        target_os = "fuchsia",
+    )))]
+    pub fn leave_ssm_v4(
+        &self,
+        source: &Ipv4Addr,
+        group: &Ipv4Addr,
+        interface: &Ipv4Addr,
+    ) -> io::Result<()> {
+        let mreqs = sys::IpMreqSource {
+            imr_multiaddr: sys::to_in_addr(group),
+            imr_interface: sys::to_in_addr(interface),
+            imr_sourceaddr: sys::to_in_addr(source),
+        };
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_DROP_SOURCE_MEMBERSHIP,
+                mreqs,
+            )
+        }
+    }
+
+    /// Get the value of the `IP_MULTICAST_IF` option for this socket.
+    ///
+    /// For more information about this option, see [`set_multicast_if_v4`].
+    ///
+    /// [`set_multicast_if_v4`]: Socket::set_multicast_if_v4
+    pub fn multicast_if_v4(&self) -> io::Result<Ipv4Addr> {
+        unsafe {
+            getsockopt(self.as_raw(), sys::IPPROTO_IP, sys::IP_MULTICAST_IF).map(sys::from_in_addr)
+        }
+    }
+
+    /// Set the value of the `IP_MULTICAST_IF` option for this socket.
+    ///
+    /// Specifies the interface to use for routing multicast packets.
+    pub fn set_multicast_if_v4(&self, interface: &Ipv4Addr) -> io::Result<()> {
+        let interface = sys::to_in_addr(interface);
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_MULTICAST_IF,
+                interface,
+            )
+        }
+    }
+
+    /// Get 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`]: Socket::set_multicast_loop_v4
+    pub fn multicast_loop_v4(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IP, sys::IP_MULTICAST_LOOP)
+                .map(|loop_v4| loop_v4 != 0)
+        }
+    }
+
+    /// Set the value of the `IP_MULTICAST_LOOP` option for this socket.
+    ///
+    /// If enabled, multicast packets will be looped back to the local socket.
+    /// Note that this may not have any affect on IPv6 sockets.
+    pub fn set_multicast_loop_v4(&self, loop_v4: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_MULTICAST_LOOP,
+                loop_v4 as c_int,
+            )
+        }
+    }
+
+    /// Get 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`]: Socket::set_multicast_ttl_v4
+    pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IP, sys::IP_MULTICAST_TTL)
+                .map(|ttl| ttl as u32)
+        }
+    }
+
+    /// Set 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't leave the local network unless explicitly requested.
+    ///
+    /// Note that this may not have any affect on IPv6 sockets.
+    pub fn set_multicast_ttl_v4(&self, ttl: u32) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_MULTICAST_TTL,
+                ttl as c_int,
+            )
+        }
+    }
+
+    /// Get the value of the `IP_TTL` option for this socket.
+    ///
+    /// For more information about this option, see [`set_ttl`].
+    ///
+    /// [`set_ttl`]: Socket::set_ttl
+    pub fn ttl(&self) -> io::Result<u32> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IP, sys::IP_TTL).map(|ttl| ttl as u32)
+        }
+    }
+
+    /// Set the value of the `IP_TTL` option for this socket.
+    ///
+    /// This value sets the time-to-live field that is used in every packet sent
+    /// from this socket.
+    pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
+        unsafe { setsockopt(self.as_raw(), sys::IPPROTO_IP, sys::IP_TTL, ttl as c_int) }
+    }
+
+    /// Set the value of the `IP_TOS` option for this socket.
+    ///
+    /// This value sets the type-of-service field that is used in every packet
+    /// sent from this socket.
+    ///
+    /// NOTE: <https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options>
+    /// documents that not all versions of windows support `IP_TOS`.
+    #[cfg(not(any(
+        target_os = "fuchsia",
+        target_os = "redox",
+        target_os = "solaris",
+        target_os = "illumos",
+    )))]
+    pub fn set_tos(&self, tos: u32) -> io::Result<()> {
+        unsafe { setsockopt(self.as_raw(), sys::IPPROTO_IP, sys::IP_TOS, tos as c_int) }
+    }
+
+    /// Get the value of the `IP_TOS` option for this socket.
+    ///
+    /// For more information about this option, see [`set_tos`].
+    ///
+    /// NOTE: <https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options>
+    /// documents that not all versions of windows support `IP_TOS`.
+    ///
+    /// [`set_tos`]: Socket::set_tos
+    #[cfg(not(any(
+        target_os = "fuchsia",
+        target_os = "redox",
+        target_os = "solaris",
+        target_os = "illumos",
+    )))]
+    pub fn tos(&self) -> io::Result<u32> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IP, sys::IP_TOS).map(|tos| tos as u32)
+        }
+    }
+
+    /// Set the value of the `IP_RECVTOS` option for this socket.
+    ///
+    /// If enabled, the IP_TOS ancillary message is passed with
+    /// incoming packets. It contains a byte which specifies the
+    /// Type of Service/Precedence field of the packet header.
+    #[cfg(not(any(
+        target_os = "dragonfly",
+        target_os = "fuchsia",
+        target_os = "illumos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox",
+        target_os = "solaris",
+        target_os = "windows",
+    )))]
+    pub fn set_recv_tos(&self, recv_tos: bool) -> io::Result<()> {
+        let recv_tos = if recv_tos { 1 } else { 0 };
+
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IP,
+                sys::IP_RECVTOS,
+                recv_tos as c_int,
+            )
+        }
+    }
+
+    /// Get the value of the `IP_RECVTOS` option for this socket.
+    ///
+    /// For more information about this option, see [`set_recv_tos`].
+    ///
+    /// [`set_recv_tos`]: Socket::set_recv_tos
+    #[cfg(not(any(
+        target_os = "dragonfly",
+        target_os = "fuchsia",
+        target_os = "illumos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox",
+        target_os = "solaris",
+        target_os = "windows",
+    )))]
+    pub fn recv_tos(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IP, sys::IP_RECVTOS)
+                .map(|recv_tos| recv_tos > 0)
+        }
+    }
+}
+
+/// Socket options for IPv6 sockets, get/set using `IPPROTO_IPV6`.
+///
+/// Additional documentation can be found in documentation of the OS.
+/// * Linux: <https://man7.org/linux/man-pages/man7/ipv6.7.html>
+/// * Windows: <https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options>
+impl Socket {
+    /// Join a multicast group using `IPV6_ADD_MEMBERSHIP` option on this socket.
+    ///
+    /// Some OSs use `IPV6_JOIN_GROUP` for this option.
+    ///
+    /// 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).
+    pub fn join_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> io::Result<()> {
+        let mreq = sys::Ipv6Mreq {
+            ipv6mr_multiaddr: sys::to_in6_addr(multiaddr),
+            // NOTE: some OSs use `c_int`, others use `c_uint`.
+            ipv6mr_interface: interface as _,
+        };
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IPV6,
+                sys::IPV6_ADD_MEMBERSHIP,
+                mreq,
+            )
+        }
+    }
+
+    /// Leave a multicast group using `IPV6_DROP_MEMBERSHIP` option on this socket.
+    ///
+    /// Some OSs use `IPV6_LEAVE_GROUP` for this option.
+    ///
+    /// For more information about this option, see [`join_multicast_v6`].
+    ///
+    /// [`join_multicast_v6`]: Socket::join_multicast_v6
+    pub fn leave_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> io::Result<()> {
+        let mreq = sys::Ipv6Mreq {
+            ipv6mr_multiaddr: sys::to_in6_addr(multiaddr),
+            // NOTE: some OSs use `c_int`, others use `c_uint`.
+            ipv6mr_interface: interface as _,
+        };
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IPV6,
+                sys::IPV6_DROP_MEMBERSHIP,
+                mreq,
+            )
+        }
+    }
+
+    /// Get the value of the `IPV6_MULTICAST_HOPS` option for this socket
+    ///
+    /// For more information about this option, see [`set_multicast_hops_v6`].
+    ///
+    /// [`set_multicast_hops_v6`]: Socket::set_multicast_hops_v6
+    pub fn multicast_hops_v6(&self) -> io::Result<u32> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IPV6, sys::IPV6_MULTICAST_HOPS)
+                .map(|hops| hops as u32)
+        }
+    }
+
+    /// Set the value of the `IPV6_MULTICAST_HOPS` option for this socket
+    ///
+    /// Indicates the number of "routers" multicast packets will transit for
+    /// this socket. The default value is 1 which means that multicast packets
+    /// don't leave the local network unless explicitly requested.
+    pub fn set_multicast_hops_v6(&self, hops: u32) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IPV6,
+                sys::IPV6_MULTICAST_HOPS,
+                hops as c_int,
+            )
+        }
+    }
+
+    /// Get the value of the `IPV6_MULTICAST_IF` option for this socket.
+    ///
+    /// For more information about this option, see [`set_multicast_if_v6`].
+    ///
+    /// [`set_multicast_if_v6`]: Socket::set_multicast_if_v6
+    pub fn multicast_if_v6(&self) -> io::Result<u32> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IPV6, sys::IPV6_MULTICAST_IF)
+                .map(|interface| interface as u32)
+        }
+    }
+
+    /// Set the value of the `IPV6_MULTICAST_IF` option for this socket.
+    ///
+    /// Specifies the interface to use for routing multicast packets. Unlike
+    /// ipv4, this is generally required in ipv6 contexts where network routing
+    /// prefixes may overlap.
+    pub fn set_multicast_if_v6(&self, interface: u32) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IPV6,
+                sys::IPV6_MULTICAST_IF,
+                interface as c_int,
+            )
+        }
+    }
+
+    /// Get 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`]: Socket::set_multicast_loop_v6
+    pub fn multicast_loop_v6(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IPV6, sys::IPV6_MULTICAST_LOOP)
+                .map(|loop_v6| loop_v6 != 0)
+        }
+    }
+
+    /// Set the value of the `IPV6_MULTICAST_LOOP` option for this socket.
+    ///
+    /// Controls whether this socket sees the multicast packets it sends itself.
+    /// Note that this may not have any affect on IPv4 sockets.
+    pub fn set_multicast_loop_v6(&self, loop_v6: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IPV6,
+                sys::IPV6_MULTICAST_LOOP,
+                loop_v6 as c_int,
+            )
+        }
+    }
+
+    /// Get the value of the `IPV6_UNICAST_HOPS` option for this socket.
+    ///
+    /// Specifies the hop limit for ipv6 unicast packets
+    pub fn unicast_hops_v6(&self) -> io::Result<u32> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IPV6, sys::IPV6_UNICAST_HOPS)
+                .map(|hops| hops as u32)
+        }
+    }
+
+    /// Set the value for the `IPV6_UNICAST_HOPS` option on this socket.
+    ///
+    /// Specifies the hop limit for ipv6 unicast packets
+    pub fn set_unicast_hops_v6(&self, hops: u32) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IPV6,
+                sys::IPV6_UNICAST_HOPS,
+                hops as c_int,
+            )
+        }
+    }
+
+    /// Get the value of the `IPV6_V6ONLY` option for this socket.
+    ///
+    /// For more information about this option, see [`set_only_v6`].
+    ///
+    /// [`set_only_v6`]: Socket::set_only_v6
+    pub fn only_v6(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IPV6, sys::IPV6_V6ONLY)
+                .map(|only_v6| only_v6 != 0)
+        }
+    }
+
+    /// Set the value for the `IPV6_V6ONLY` option on this socket.
+    ///
+    /// If this is set to `true` then the socket is restricted to sending and
+    /// receiving IPv6 packets only. In this case two IPv4 and IPv6 applications
+    /// can bind the same port at the same time.
+    ///
+    /// If this is set to `false` then the socket can be used to send and
+    /// receive packets from an IPv4-mapped IPv6 address.
+    pub fn set_only_v6(&self, only_v6: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IPV6,
+                sys::IPV6_V6ONLY,
+                only_v6 as c_int,
+            )
+        }
+    }
+}
+
+/// Socket options for TCP sockets, get/set using `IPPROTO_TCP`.
+///
+/// Additional documentation can be found in documentation of the OS.
+/// * Linux: <https://man7.org/linux/man-pages/man7/tcp.7.html>
+/// * Windows: <https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options>
+impl Socket {
+    /// Get the value of the `TCP_KEEPIDLE` option on this socket.
+    ///
+    /// This returns the value of `TCP_KEEPALIVE` on macOS and iOS and `TCP_KEEPIDLE` on all other
+    /// supported Unix operating systems.
+    #[cfg(any(
+        doc,
+        all(
+            feature = "all",
+            not(any(windows, target_os = "haiku", target_os = "openbsd"))
+        )
+    ))]
+    #[cfg_attr(
+        docsrs,
+        doc(cfg(all(
+            feature = "all",
+            not(any(windows, target_os = "haiku", target_os = "openbsd"))
+        )))
+    )]
+    pub fn keepalive_time(&self) -> io::Result<Duration> {
+        sys::keepalive_time(self.as_raw())
+    }
+
+    /// Get the value of the `TCP_KEEPINTVL` option on this socket.
+    ///
+    /// For more information about this option, see [`set_tcp_keepalive`].
+    ///
+    /// [`set_tcp_keepalive`]: Socket::set_tcp_keepalive
+    #[cfg(all(
+        feature = "all",
+        any(
+            doc,
+            target_os = "android",
+            target_os = "dragonfly",
+            target_os = "freebsd",
+            target_os = "fuchsia",
+            target_os = "illumos",
+            target_os = "linux",
+            target_os = "netbsd",
+            target_vendor = "apple",
+        )
+    ))]
+    #[cfg_attr(
+        docsrs,
+        doc(cfg(all(
+            feature = "all",
+            any(
+                target_os = "android",
+                target_os = "dragonfly",
+                target_os = "freebsd",
+                target_os = "fuchsia",
+                target_os = "illumos",
+                target_os = "linux",
+                target_os = "netbsd",
+                target_vendor = "apple",
+            )
+        )))
+    )]
+    pub fn keepalive_interval(&self) -> io::Result<Duration> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_TCP, sys::TCP_KEEPINTVL)
+                .map(|secs| Duration::from_secs(secs as u64))
+        }
+    }
+
+    /// Get the value of the `TCP_KEEPCNT` option on this socket.
+    ///
+    /// For more information about this option, see [`set_tcp_keepalive`].
+    ///
+    /// [`set_tcp_keepalive`]: Socket::set_tcp_keepalive
+    #[cfg(all(
+        feature = "all",
+        any(
+            doc,
+            target_os = "android",
+            target_os = "dragonfly",
+            target_os = "freebsd",
+            target_os = "fuchsia",
+            target_os = "illumos",
+            target_os = "linux",
+            target_os = "netbsd",
+            target_vendor = "apple",
+        )
+    ))]
+    #[cfg_attr(
+        docsrs,
+        doc(cfg(all(
+            feature = "all",
+            any(
+                target_os = "android",
+                target_os = "dragonfly",
+                target_os = "freebsd",
+                target_os = "fuchsia",
+                target_os = "illumos",
+                target_os = "linux",
+                target_os = "netbsd",
+                target_vendor = "apple",
+            )
+        )))
+    )]
+    pub fn keepalive_retries(&self) -> io::Result<u32> {
+        unsafe {
+            getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_TCP, sys::TCP_KEEPCNT)
+                .map(|retries| retries as u32)
+        }
+    }
+
+    /// Set parameters configuring TCP keepalive probes for this socket.
+    ///
+    /// The supported parameters depend on the operating system, and are
+    /// configured using the [`TcpKeepalive`] struct. At a minimum, all systems
+    /// support configuring the [keepalive time]: the time after which the OS
+    /// will start sending keepalive messages on an idle connection.
+    ///
+    /// [keepalive time]: TcpKeepalive::with_time
+    ///
+    /// # Notes
+    ///
+    /// * This will enable `SO_KEEPALIVE` on this socket, if it is not already
+    ///   enabled.
+    /// * On some platforms, such as Windows, any keepalive parameters *not*
+    ///   configured by the `TcpKeepalive` struct passed to this function may be
+    ///   overwritten with their default values. Therefore, this function should
+    ///   either only be called once per socket, or the same parameters should
+    ///   be passed every time it is called.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::time::Duration;
+    ///
+    /// use socket2::{Socket, TcpKeepalive, Domain, Type};
+    ///
+    /// # fn main() -> std::io::Result<()> {
+    /// let socket = Socket::new(Domain::IPV4, Type::STREAM, None)?;
+    /// let keepalive = TcpKeepalive::new()
+    ///     .with_time(Duration::from_secs(4));
+    ///     // Depending on the target operating system, we may also be able to
+    ///     // configure the keepalive probe interval and/or the number of
+    ///     // retries here as well.
+    ///
+    /// socket.set_tcp_keepalive(&keepalive)?;
+    /// # Ok(()) }
+    /// ```
+    ///
+    pub fn set_tcp_keepalive(&self, params: &TcpKeepalive) -> io::Result<()> {
+        self.set_keepalive(true)?;
+        sys::set_tcp_keepalive(self.as_raw(), params)
+    }
+
+    /// Get the value of the `TCP_NODELAY` option on this socket.
+    ///
+    /// For more information about this option, see [`set_nodelay`].
+    ///
+    /// [`set_nodelay`]: Socket::set_nodelay
+    pub fn nodelay(&self) -> io::Result<bool> {
+        unsafe {
+            getsockopt::<Bool>(self.as_raw(), sys::IPPROTO_TCP, sys::TCP_NODELAY)
+                .map(|nodelay| nodelay != 0)
+        }
+    }
+
+    /// Set the value of the `TCP_NODELAY` option on this socket.
+    ///
+    /// If set, this option disables the Nagle algorithm. This means that
+    /// segments are always sent as soon as possible, even if there is only a
+    /// small amount of data. When not set, data is buffered until there is a
+    /// sufficient amount to send out, thereby avoiding the frequent sending of
+    /// small packets.
+    pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_TCP,
+                sys::TCP_NODELAY,
+                nodelay as c_int,
+            )
+        }
+    }
+}
+
+impl Read for Socket {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        // Safety: the `recv` implementation promises not to write uninitialised
+        // bytes to the `buf`fer, so this casting is safe.
+        let buf = unsafe { &mut *(buf as *mut [u8] as *mut [MaybeUninit<u8>]) };
+        self.recv(buf)
+    }
+
+    #[cfg(not(target_os = "redox"))]
+    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        // Safety: both `IoSliceMut` and `MaybeUninitSlice` promise to have the
+        // same layout, that of `iovec`/`WSABUF`. Furthermore `recv_vectored`
+        // promises to not write unitialised bytes to the `bufs` and pass it
+        // directly to the `recvmsg` system call, so this is safe.
+        let bufs = unsafe { &mut *(bufs as *mut [IoSliceMut<'_>] as *mut [MaybeUninitSlice<'_>]) };
+        self.recv_vectored(bufs).map(|(n, _)| n)
+    }
+}
+
+impl<'a> Read for &'a Socket {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        // Safety: see other `Read::read` impl.
+        let buf = unsafe { &mut *(buf as *mut [u8] as *mut [MaybeUninit<u8>]) };
+        self.recv(buf)
+    }
+
+    #[cfg(not(target_os = "redox"))]
+    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        // Safety: see other `Read::read` impl.
+        let bufs = unsafe { &mut *(bufs as *mut [IoSliceMut<'_>] as *mut [MaybeUninitSlice<'_>]) };
+        self.recv_vectored(bufs).map(|(n, _)| n)
+    }
+}
+
+impl Write for Socket {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.send(buf)
+    }
+
+    #[cfg(not(target_os = "redox"))]
+    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        self.send_vectored(bufs)
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+impl<'a> Write for &'a Socket {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.send(buf)
+    }
+
+    #[cfg(not(target_os = "redox"))]
+    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        self.send_vectored(bufs)
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+impl fmt::Debug for Socket {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Socket")
+            .field("raw", &self.as_raw())
+            .field("local_addr", &self.local_addr().ok())
+            .field("peer_addr", &self.peer_addr().ok())
+            .finish()
+    }
+}
+
+from!(net::TcpStream, Socket);
+from!(net::TcpListener, Socket);
+from!(net::UdpSocket, Socket);
+from!(Socket, net::TcpStream);
+from!(Socket, net::TcpListener);
+from!(Socket, net::UdpSocket);