diff options
Diffstat (limited to 'third_party/rust/tokio/src/net/unix')
| -rw-r--r-- | third_party/rust/tokio/src/net/unix/datagram/mod.rs | 3 | ||||
| -rw-r--r-- | third_party/rust/tokio/src/net/unix/datagram/socket.rs | 1422 | ||||
| -rw-r--r-- | third_party/rust/tokio/src/net/unix/listener.rs | 186 | ||||
| -rw-r--r-- | third_party/rust/tokio/src/net/unix/mod.rs | 24 | ||||
| -rw-r--r-- | third_party/rust/tokio/src/net/unix/socketaddr.rs | 31 | ||||
| -rw-r--r-- | third_party/rust/tokio/src/net/unix/split.rs | 305 | ||||
| -rw-r--r-- | third_party/rust/tokio/src/net/unix/split_owned.rs | 393 | ||||
| -rw-r--r-- | third_party/rust/tokio/src/net/unix/stream.rs | 960 | ||||
| -rw-r--r-- | third_party/rust/tokio/src/net/unix/ucred.rs | 252 |
9 files changed, 3576 insertions, 0 deletions
diff --git a/third_party/rust/tokio/src/net/unix/datagram/mod.rs b/third_party/rust/tokio/src/net/unix/datagram/mod.rs new file mode 100644 index 0000000000..6268b4ac90 --- /dev/null +++ b/third_party/rust/tokio/src/net/unix/datagram/mod.rs @@ -0,0 +1,3 @@ +//! Unix datagram types. + +pub(crate) mod socket; diff --git a/third_party/rust/tokio/src/net/unix/datagram/socket.rs b/third_party/rust/tokio/src/net/unix/datagram/socket.rs new file mode 100644 index 0000000000..d5b618663d --- /dev/null +++ b/third_party/rust/tokio/src/net/unix/datagram/socket.rs @@ -0,0 +1,1422 @@ +use crate::io::{Interest, PollEvented, ReadBuf, Ready}; +use crate::net::unix::SocketAddr; + +use std::convert::TryFrom; +use std::fmt; +use std::io; +use std::net::Shutdown; +use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::net; +use std::path::Path; +use std::task::{Context, Poll}; + +cfg_io_util! { + use bytes::BufMut; +} + +cfg_net_unix! { + /// An I/O object representing a Unix datagram socket. + /// + /// A socket can be either named (associated with a filesystem path) or + /// unnamed. + /// + /// This type does not provide a `split` method, because this functionality + /// can be achieved by wrapping the socket in an [`Arc`]. Note that you do + /// not need a `Mutex` to share the `UnixDatagram` — an `Arc<UnixDatagram>` + /// is enough. This is because all of the methods take `&self` instead of + /// `&mut self`. + /// + /// **Note:** named sockets are persisted even after the object is dropped + /// and the program has exited, and cannot be reconnected. It is advised + /// that you either check for and unlink the existing socket if it exists, + /// or use a temporary file that is guaranteed to not already exist. + /// + /// [`Arc`]: std::sync::Arc + /// + /// # Examples + /// Using named sockets, associated with a filesystem path: + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use tempfile::tempdir; + /// + /// // We use a temporary directory so that the socket + /// // files left by the bound sockets will get cleaned up. + /// let tmp = tempdir()?; + /// + /// // Bind each socket to a filesystem path + /// let tx_path = tmp.path().join("tx"); + /// let tx = UnixDatagram::bind(&tx_path)?; + /// let rx_path = tmp.path().join("rx"); + /// let rx = UnixDatagram::bind(&rx_path)?; + /// + /// let bytes = b"hello world"; + /// tx.send_to(bytes, &rx_path).await?; + /// + /// let mut buf = vec![0u8; 24]; + /// let (size, addr) = rx.recv_from(&mut buf).await?; + /// + /// let dgram = &buf[..size]; + /// assert_eq!(dgram, bytes); + /// assert_eq!(addr.as_pathname().unwrap(), &tx_path); + /// + /// # Ok(()) + /// # } + /// ``` + /// + /// Using unnamed sockets, created as a pair + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// + /// // Create the pair of sockets + /// let (sock1, sock2) = UnixDatagram::pair()?; + /// + /// // Since the sockets are paired, the paired send/recv + /// // functions can be used + /// let bytes = b"hello world"; + /// sock1.send(bytes).await?; + /// + /// let mut buff = vec![0u8; 24]; + /// let size = sock2.recv(&mut buff).await?; + /// + /// let dgram = &buff[..size]; + /// assert_eq!(dgram, bytes); + /// + /// # Ok(()) + /// # } + /// ``` + pub struct UnixDatagram { + io: PollEvented<mio::net::UnixDatagram>, + } +} + +impl UnixDatagram { + /// 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`. + /// + /// # 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::Interest; + /// use tokio::net::UnixDatagram; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let dir = tempfile::tempdir().unwrap(); + /// let client_path = dir.path().join("client.sock"); + /// let server_path = dir.path().join("server.sock"); + /// let socket = UnixDatagram::bind(&client_path)?; + /// socket.connect(&server_path)?; + /// + /// loop { + /// let ready = socket.ready(Interest::READABLE | Interest::WRITABLE).await?; + /// + /// if ready.is_readable() { + /// let mut data = [0; 1024]; + /// match socket.try_recv(&mut data[..]) { + /// Ok(n) => { + /// println!("received {:?}", &data[..n]); + /// } + /// // False-positive, continue + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {} + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// + /// if ready.is_writable() { + /// // Write some data + /// match socket.try_send(b"hello world") { + /// Ok(n) => { + /// println!("sent {} bytes", n); + /// } + /// // False-positive, continue + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {} + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// } + /// } + /// ``` + pub async fn ready(&self, interest: Interest) -> io::Result<Ready> { + let event = self.io.registration().readiness(interest).await?; + Ok(event.ready) + } + + /// 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::UnixDatagram; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let dir = tempfile::tempdir().unwrap(); + /// let client_path = dir.path().join("client.sock"); + /// let server_path = dir.path().join("server.sock"); + /// let socket = UnixDatagram::bind(&client_path)?; + /// socket.connect(&server_path)?; + /// + /// 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"hello world") { + /// Ok(n) => { + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub async fn writable(&self) -> io::Result<()> { + self.ready(Interest::WRITABLE).await?; + Ok(()) + } + + /// Polls for write/send readiness. + /// + /// If the socket is not currently ready for sending, this method will + /// store a clone of the `Waker` from the provided `Context`. When the socket + /// 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 socket is not ready for writing. + /// * `Poll::Ready(Ok(()))` if the socket 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 + pub fn poll_send_ready(&self, cx: &mut Context<'_>) -> Poll<io::Result<()>> { + self.io.registration().poll_write_ready(cx).map_ok(|_| ()) + } + + /// 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::UnixDatagram; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let client_path = dir.path().join("client.sock"); + /// let server_path = dir.path().join("server.sock"); + /// let socket = UnixDatagram::bind(&client_path)?; + /// socket.connect(&server_path)?; + /// + /// 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(&mut buf) { + /// Ok(n) => { + /// println!("GOT {:?}", &buf[..n]); + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub async fn readable(&self) -> io::Result<()> { + self.ready(Interest::READABLE).await?; + Ok(()) + } + + /// Polls for read/receive readiness. + /// + /// If the socket is not currently ready for receiving, this method will + /// store a clone of the `Waker` from the provided `Context`. When the + /// 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 socket is not ready for reading. + /// * `Poll::Ready(Ok(()))` if the socket 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 + pub fn poll_recv_ready(&self, cx: &mut Context<'_>) -> Poll<io::Result<()>> { + self.io.registration().poll_read_ready(cx).map_ok(|_| ()) + } + + /// Creates a new `UnixDatagram` bound to the specified path. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use tempfile::tempdir; + /// + /// // We use a temporary directory so that the socket + /// // files left by the bound sockets will get cleaned up. + /// let tmp = tempdir()?; + /// + /// // Bind the socket to a filesystem path + /// let socket_path = tmp.path().join("socket"); + /// let socket = UnixDatagram::bind(&socket_path)?; + /// + /// # Ok(()) + /// # } + /// ``` + pub fn bind<P>(path: P) -> io::Result<UnixDatagram> + where + P: AsRef<Path>, + { + let socket = mio::net::UnixDatagram::bind(path)?; + UnixDatagram::new(socket) + } + + /// Creates an unnamed pair of connected sockets. + /// + /// This function will create a pair of interconnected Unix sockets for + /// communicating back and forth between one another. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// + /// // Create the pair of sockets + /// let (sock1, sock2) = UnixDatagram::pair()?; + /// + /// // Since the sockets are paired, the paired send/recv + /// // functions can be used + /// let bytes = b"hail eris"; + /// sock1.send(bytes).await?; + /// + /// let mut buff = vec![0u8; 24]; + /// let size = sock2.recv(&mut buff).await?; + /// + /// let dgram = &buff[..size]; + /// assert_eq!(dgram, bytes); + /// + /// # Ok(()) + /// # } + /// ``` + pub fn pair() -> io::Result<(UnixDatagram, UnixDatagram)> { + let (a, b) = mio::net::UnixDatagram::pair()?; + let a = UnixDatagram::new(a)?; + let b = UnixDatagram::new(b)?; + + Ok((a, b)) + } + + /// Creates new `UnixDatagram` from a `std::os::unix::net::UnixDatagram`. + /// + /// This function is intended to be used to wrap a UnixDatagram from the + /// standard library in the Tokio equivalent. The conversion assumes + /// nothing about the underlying datagram; it is left up to the user to set + /// it in non-blocking mode. + /// + /// # 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. + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use std::os::unix::net::UnixDatagram as StdUDS; + /// use tempfile::tempdir; + /// + /// // We use a temporary directory so that the socket + /// // files left by the bound sockets will get cleaned up. + /// let tmp = tempdir()?; + /// + /// // Bind the socket to a filesystem path + /// let socket_path = tmp.path().join("socket"); + /// let std_socket = StdUDS::bind(&socket_path)?; + /// std_socket.set_nonblocking(true)?; + /// let tokio_socket = UnixDatagram::from_std(std_socket)?; + /// + /// # Ok(()) + /// # } + /// ``` + pub fn from_std(datagram: net::UnixDatagram) -> io::Result<UnixDatagram> { + let socket = mio::net::UnixDatagram::from_std(datagram); + let io = PollEvented::new(socket)?; + Ok(UnixDatagram { io }) + } + + /// Turns a [`tokio::net::UnixDatagram`] into a [`std::os::unix::net::UnixDatagram`]. + /// + /// The returned [`std::os::unix::net::UnixDatagram`] 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() -> Result<(), Box<dyn Error>> { + /// let tokio_socket = tokio::net::UnixDatagram::bind("127.0.0.1:0")?; + /// let std_socket = tokio_socket.into_std()?; + /// std_socket.set_nonblocking(false)?; + /// Ok(()) + /// } + /// ``` + /// + /// [`tokio::net::UnixDatagram`]: UnixDatagram + /// [`std::os::unix::net::UnixDatagram`]: std::os::unix::net::UnixDatagram + /// [`set_nonblocking`]: fn@std::os::unix::net::UnixDatagram::set_nonblocking + pub fn into_std(self) -> io::Result<std::os::unix::net::UnixDatagram> { + self.io + .into_inner() + .map(|io| io.into_raw_fd()) + .map(|raw_fd| unsafe { std::os::unix::net::UnixDatagram::from_raw_fd(raw_fd) }) + } + + fn new(socket: mio::net::UnixDatagram) -> io::Result<UnixDatagram> { + let io = PollEvented::new(socket)?; + Ok(UnixDatagram { io }) + } + + /// Creates a new `UnixDatagram` which is not bound to any address. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use tempfile::tempdir; + /// + /// // Create an unbound socket + /// let tx = UnixDatagram::unbound()?; + /// + /// // Create another, bound socket + /// let tmp = tempdir()?; + /// let rx_path = tmp.path().join("rx"); + /// let rx = UnixDatagram::bind(&rx_path)?; + /// + /// // Send to the bound socket + /// let bytes = b"hello world"; + /// tx.send_to(bytes, &rx_path).await?; + /// + /// let mut buf = vec![0u8; 24]; + /// let (size, addr) = rx.recv_from(&mut buf).await?; + /// + /// let dgram = &buf[..size]; + /// assert_eq!(dgram, bytes); + /// + /// # Ok(()) + /// # } + /// ``` + pub fn unbound() -> io::Result<UnixDatagram> { + let socket = mio::net::UnixDatagram::unbound()?; + UnixDatagram::new(socket) + } + + /// Connects the socket to the specified address. + /// + /// The `send` method may be used to send data to the specified address. + /// `recv` and `recv_from` will only receive data from that address. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use tempfile::tempdir; + /// + /// // Create an unbound socket + /// let tx = UnixDatagram::unbound()?; + /// + /// // Create another, bound socket + /// let tmp = tempdir()?; + /// let rx_path = tmp.path().join("rx"); + /// let rx = UnixDatagram::bind(&rx_path)?; + /// + /// // Connect to the bound socket + /// tx.connect(&rx_path)?; + /// + /// // Send to the bound socket + /// let bytes = b"hello world"; + /// tx.send(bytes).await?; + /// + /// let mut buf = vec![0u8; 24]; + /// let (size, addr) = rx.recv_from(&mut buf).await?; + /// + /// let dgram = &buf[..size]; + /// assert_eq!(dgram, bytes); + /// + /// # Ok(()) + /// # } + /// ``` + pub fn connect<P: AsRef<Path>>(&self, path: P) -> io::Result<()> { + self.io.connect(path) + } + + /// Sends data on the socket to the socket's peer. + /// + /// # 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 + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// + /// // Create the pair of sockets + /// let (sock1, sock2) = UnixDatagram::pair()?; + /// + /// // Since the sockets are paired, the paired send/recv + /// // functions can be used + /// let bytes = b"hello world"; + /// sock1.send(bytes).await?; + /// + /// let mut buff = vec![0u8; 24]; + /// let size = sock2.recv(&mut buff).await?; + /// + /// let dgram = &buff[..size]; + /// assert_eq!(dgram, bytes); + /// + /// # Ok(()) + /// # } + /// ``` + pub async fn send(&self, buf: &[u8]) -> io::Result<usize> { + self.io + .registration() + .async_io(Interest::WRITABLE, || self.io.send(buf)) + .await + } + + /// Tries to send a datagram to the peer without waiting. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixDatagram; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let dir = tempfile::tempdir().unwrap(); + /// let client_path = dir.path().join("client.sock"); + /// let server_path = dir.path().join("server.sock"); + /// let socket = UnixDatagram::bind(&client_path)?; + /// socket.connect(&server_path)?; + /// + /// 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"hello world") { + /// Ok(n) => { + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_send(&self, buf: &[u8]) -> io::Result<usize> { + self.io + .registration() + .try_io(Interest::WRITABLE, || self.io.send(buf)) + } + + /// Tries to send a datagram to the peer without waiting. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixDatagram; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let dir = tempfile::tempdir().unwrap(); + /// let client_path = dir.path().join("client.sock"); + /// let server_path = dir.path().join("server.sock"); + /// let socket = UnixDatagram::bind(&client_path)?; + /// + /// 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_to(b"hello world", &server_path) { + /// Ok(n) => { + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_send_to<P>(&self, buf: &[u8], target: P) -> io::Result<usize> + where + P: AsRef<Path>, + { + self.io + .registration() + .try_io(Interest::WRITABLE, || self.io.send_to(buf, target)) + } + + /// Receives data from the socket. + /// + /// # 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. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// + /// // Create the pair of sockets + /// let (sock1, sock2) = UnixDatagram::pair()?; + /// + /// // Since the sockets are paired, the paired send/recv + /// // functions can be used + /// let bytes = b"hello world"; + /// sock1.send(bytes).await?; + /// + /// let mut buff = vec![0u8; 24]; + /// let size = sock2.recv(&mut buff).await?; + /// + /// let dgram = &buff[..size]; + /// assert_eq!(dgram, bytes); + /// + /// # Ok(()) + /// # } + /// ``` + pub async fn recv(&self, buf: &mut [u8]) -> io::Result<usize> { + self.io + .registration() + .async_io(Interest::READABLE, || self.io.recv(buf)) + .await + } + + /// Tries to receive a datagram from the peer without waiting. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixDatagram; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let client_path = dir.path().join("client.sock"); + /// let server_path = dir.path().join("server.sock"); + /// let socket = UnixDatagram::bind(&client_path)?; + /// socket.connect(&server_path)?; + /// + /// 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(&mut buf) { + /// Ok(n) => { + /// println!("GOT {:?}", &buf[..n]); + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_recv(&self, buf: &mut [u8]) -> io::Result<usize> { + self.io + .registration() + .try_io(Interest::READABLE, || self.io.recv(buf)) + } + + cfg_io_util! { + /// Tries to receive data from the socket without waiting. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixDatagram; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let client_path = dir.path().join("client.sock"); + /// let server_path = dir.path().join("server.sock"); + /// let socket = UnixDatagram::bind(&client_path)?; + /// + /// 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(&mut buf) { + /// Ok((n, _addr)) => { + /// println!("GOT {:?}", &buf[..n]); + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_recv_buf_from<B: BufMut>(&self, buf: &mut B) -> io::Result<(usize, SocketAddr)> { + let (n, addr) = self.io.registration().try_io(Interest::READABLE, || { + let dst = buf.chunk_mut(); + let dst = + unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit<u8>] as *mut [u8]) }; + + // Safety: We trust `UnixDatagram::recv_from` to have filled up `n` bytes in the + // buffer. + let (n, addr) = (&*self.io).recv_from(dst)?; + + unsafe { + buf.advance_mut(n); + } + + Ok((n, addr)) + })?; + + Ok((n, SocketAddr(addr))) + } + + /// Tries to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixDatagram; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let client_path = dir.path().join("client.sock"); + /// let server_path = dir.path().join("server.sock"); + /// let socket = UnixDatagram::bind(&client_path)?; + /// socket.connect(&server_path)?; + /// + /// 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(&mut buf) { + /// Ok(n) => { + /// println!("GOT {:?}", &buf[..n]); + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_recv_buf<B: BufMut>(&self, buf: &mut B) -> io::Result<usize> { + self.io.registration().try_io(Interest::READABLE, || { + let dst = buf.chunk_mut(); + let dst = + unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit<u8>] as *mut [u8]) }; + + // Safety: We trust `UnixDatagram::recv` to have filled up `n` bytes in the + // buffer. + let n = (&*self.io).recv(dst)?; + + unsafe { + buf.advance_mut(n); + } + + Ok(n) + }) + } + } + + /// Sends data on the socket to the specified address. + /// + /// # 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. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use tempfile::tempdir; + /// + /// // We use a temporary directory so that the socket + /// // files left by the bound sockets will get cleaned up. + /// let tmp = tempdir()?; + /// + /// // Bind each socket to a filesystem path + /// let tx_path = tmp.path().join("tx"); + /// let tx = UnixDatagram::bind(&tx_path)?; + /// let rx_path = tmp.path().join("rx"); + /// let rx = UnixDatagram::bind(&rx_path)?; + /// + /// let bytes = b"hello world"; + /// tx.send_to(bytes, &rx_path).await?; + /// + /// let mut buf = vec![0u8; 24]; + /// let (size, addr) = rx.recv_from(&mut buf).await?; + /// + /// let dgram = &buf[..size]; + /// assert_eq!(dgram, bytes); + /// assert_eq!(addr.as_pathname().unwrap(), &tx_path); + /// + /// # Ok(()) + /// # } + /// ``` + pub async fn send_to<P>(&self, buf: &[u8], target: P) -> io::Result<usize> + where + P: AsRef<Path>, + { + self.io + .registration() + .async_io(Interest::WRITABLE, || self.io.send_to(buf, target.as_ref())) + .await + } + + /// Receives data from the socket. + /// + /// # 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. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use tempfile::tempdir; + /// + /// // We use a temporary directory so that the socket + /// // files left by the bound sockets will get cleaned up. + /// let tmp = tempdir()?; + /// + /// // Bind each socket to a filesystem path + /// let tx_path = tmp.path().join("tx"); + /// let tx = UnixDatagram::bind(&tx_path)?; + /// let rx_path = tmp.path().join("rx"); + /// let rx = UnixDatagram::bind(&rx_path)?; + /// + /// let bytes = b"hello world"; + /// tx.send_to(bytes, &rx_path).await?; + /// + /// let mut buf = vec![0u8; 24]; + /// let (size, addr) = rx.recv_from(&mut buf).await?; + /// + /// let dgram = &buf[..size]; + /// assert_eq!(dgram, bytes); + /// assert_eq!(addr.as_pathname().unwrap(), &tx_path); + /// + /// # Ok(()) + /// # } + /// ``` + pub async fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> { + let (n, addr) = self + .io + .registration() + .async_io(Interest::READABLE, || self.io.recv_from(buf)) + .await?; + + Ok((n, SocketAddr(addr))) + } + + /// Attempts to receive a single datagram on the specified address. + /// + /// 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`. + pub fn poll_recv_from( + &self, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll<io::Result<SocketAddr>> { + let (n, addr) = ready!(self.io.registration().poll_read_io(cx, || { + // Safety: will not read the maybe uninitialized bytes. + let b = unsafe { + &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit<u8>] as *mut [u8]) + }; + + self.io.recv_from(b) + }))?; + + // Safety: We trust `recv` to have filled up `n` bytes in the buffer. + unsafe { + buf.assume_init(n); + } + buf.advance(n); + Poll::Ready(Ok(SocketAddr(addr))) + } + + /// Attempts to send data to the specified 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`. + pub fn poll_send_to<P>( + &self, + cx: &mut Context<'_>, + buf: &[u8], + target: P, + ) -> Poll<io::Result<usize>> + where + P: AsRef<Path>, + { + self.io + .registration() + .poll_write_io(cx, || self.io.send_to(buf, target.as_ref())) + } + + /// 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 + pub fn poll_send(&self, cx: &mut Context<'_>, buf: &[u8]) -> Poll<io::Result<usize>> { + self.io + .registration() + .poll_write_io(cx, || self.io.send(buf)) + } + + /// 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 + pub fn poll_recv(&self, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>) -> Poll<io::Result<()>> { + let n = ready!(self.io.registration().poll_read_io(cx, || { + // Safety: will not read the maybe uninitialized bytes. + let b = unsafe { + &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit<u8>] as *mut [u8]) + }; + + self.io.recv(b) + }))?; + + // Safety: We trust `recv` to have filled up `n` bytes in the buffer. + unsafe { + buf.assume_init(n); + } + buf.advance(n); + Poll::Ready(Ok(())) + } + + /// Tries to receive data from the socket without waiting. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixDatagram; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let client_path = dir.path().join("client.sock"); + /// let server_path = dir.path().join("server.sock"); + /// let socket = UnixDatagram::bind(&client_path)?; + /// + /// 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(&mut buf) { + /// Ok((n, _addr)) => { + /// println!("GOT {:?}", &buf[..n]); + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> { + let (n, addr) = self + .io + .registration() + .try_io(Interest::READABLE, || self.io.recv_from(buf))?; + + Ok((n, SocketAddr(addr))) + } + + /// 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 from 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 `UnixDatagram` type, as this will mess with the + /// readiness flag and can cause the socket to behave incorrectly. + /// + /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: UnixDatagram::readable() + /// [`writable()`]: UnixDatagram::writable() + /// [`ready()`]: UnixDatagram::ready() + pub fn try_io<R>( + &self, + interest: Interest, + f: impl FnOnce() -> io::Result<R>, + ) -> io::Result<R> { + self.io.registration().try_io(interest, f) + } + + /// Returns the local address that this socket is bound to. + /// + /// # Examples + /// For a socket bound to a local path + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use tempfile::tempdir; + /// + /// // We use a temporary directory so that the socket + /// // files left by the bound sockets will get cleaned up. + /// let tmp = tempdir()?; + /// + /// // Bind socket to a filesystem path + /// let socket_path = tmp.path().join("socket"); + /// let socket = UnixDatagram::bind(&socket_path)?; + /// + /// assert_eq!(socket.local_addr()?.as_pathname().unwrap(), &socket_path); + /// + /// # Ok(()) + /// # } + /// ``` + /// + /// For an unbound socket + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// + /// // Create an unbound socket + /// let socket = UnixDatagram::unbound()?; + /// + /// assert!(socket.local_addr()?.is_unnamed()); + /// + /// # Ok(()) + /// # } + /// ``` + pub fn local_addr(&self) -> io::Result<SocketAddr> { + self.io.local_addr().map(SocketAddr) + } + + /// Returns the address of this socket's peer. + /// + /// The `connect` method will connect the socket to a peer. + /// + /// # Examples + /// For a peer with a local path + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use tempfile::tempdir; + /// + /// // Create an unbound socket + /// let tx = UnixDatagram::unbound()?; + /// + /// // Create another, bound socket + /// let tmp = tempdir()?; + /// let rx_path = tmp.path().join("rx"); + /// let rx = UnixDatagram::bind(&rx_path)?; + /// + /// // Connect to the bound socket + /// tx.connect(&rx_path)?; + /// + /// assert_eq!(tx.peer_addr()?.as_pathname().unwrap(), &rx_path); + /// + /// # Ok(()) + /// # } + /// ``` + /// + /// For an unbound peer + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// + /// // Create the pair of sockets + /// let (sock1, sock2) = UnixDatagram::pair()?; + /// + /// assert!(sock1.peer_addr()?.is_unnamed()); + /// + /// # Ok(()) + /// # } + /// ``` + pub fn peer_addr(&self) -> io::Result<SocketAddr> { + self.io.peer_addr().map(SocketAddr) + } + + /// Returns the value of the `SO_ERROR` option. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// + /// // Create an unbound socket + /// let socket = UnixDatagram::unbound()?; + /// + /// if let Ok(Some(err)) = socket.take_error() { + /// println!("Got error: {:?}", err); + /// } + /// + /// # Ok(()) + /// # } + /// ``` + pub fn take_error(&self) -> io::Result<Option<io::Error>> { + self.io.take_error() + } + + /// Shuts down the read, write, or both halves of this connection. + /// + /// This function will cause all pending and future I/O calls on the + /// specified portions to immediately return with an appropriate value + /// (see the documentation of `Shutdown`). + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box<dyn Error>> { + /// use tokio::net::UnixDatagram; + /// use std::net::Shutdown; + /// + /// // Create an unbound socket + /// let (socket, other) = UnixDatagram::pair()?; + /// + /// socket.shutdown(Shutdown::Both)?; + /// + /// // NOTE: the following commented out code does NOT work as expected. + /// // Due to an underlying issue, the recv call will block indefinitely. + /// // See: https://github.com/tokio-rs/tokio/issues/1679 + /// //let mut buff = vec![0u8; 24]; + /// //let size = socket.recv(&mut buff).await?; + /// //assert_eq!(size, 0); + /// + /// let send_result = socket.send(b"hello world").await; + /// assert!(send_result.is_err()); + /// + /// # Ok(()) + /// # } + /// ``` + pub fn shutdown(&self, how: Shutdown) -> io::Result<()> { + self.io.shutdown(how) + } +} + +impl TryFrom<std::os::unix::net::UnixDatagram> for UnixDatagram { + type Error = io::Error; + + /// Consumes stream, returning the Tokio I/O object. + /// + /// This is equivalent to + /// [`UnixDatagram::from_std(stream)`](UnixDatagram::from_std). + fn try_from(stream: std::os::unix::net::UnixDatagram) -> Result<Self, Self::Error> { + Self::from_std(stream) + } +} + +impl fmt::Debug for UnixDatagram { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + self.io.fmt(f) + } +} + +impl AsRawFd for UnixDatagram { + fn as_raw_fd(&self) -> RawFd { + self.io.as_raw_fd() + } +} diff --git a/third_party/rust/tokio/src/net/unix/listener.rs b/third_party/rust/tokio/src/net/unix/listener.rs new file mode 100644 index 0000000000..1785f8b0f7 --- /dev/null +++ b/third_party/rust/tokio/src/net/unix/listener.rs @@ -0,0 +1,186 @@ +use crate::io::{Interest, PollEvented}; +use crate::net::unix::{SocketAddr, UnixStream}; + +use std::convert::TryFrom; +use std::fmt; +use std::io; +use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::net; +use std::path::Path; +use std::task::{Context, Poll}; + +cfg_net_unix! { + /// A Unix socket which can accept connections from other Unix sockets. + /// + /// You can accept a new connection by using the [`accept`](`UnixListener::accept`) method. + /// + /// A `UnixListener` can be turned into a `Stream` with [`UnixListenerStream`]. + /// + /// [`UnixListenerStream`]: https://docs.rs/tokio-stream/0.1/tokio_stream/wrappers/struct.UnixListenerStream.html + /// + /// # Errors + /// + /// Note that accepting a connection can lead to various errors and not all + /// of them are necessarily fatal ‒ for example having too many open file + /// descriptors or the other side closing the connection while it waits in + /// an accept queue. These would terminate the stream if not handled in any + /// way. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixListener; + /// + /// #[tokio::main] + /// async fn main() { + /// let listener = UnixListener::bind("/path/to/the/socket").unwrap(); + /// loop { + /// match listener.accept().await { + /// Ok((stream, _addr)) => { + /// println!("new client!"); + /// } + /// Err(e) => { /* connection failed */ } + /// } + /// } + /// } + /// ``` + pub struct UnixListener { + io: PollEvented<mio::net::UnixListener>, + } +} + +impl UnixListener { + /// Creates a new `UnixListener` bound to the specified path. + /// + /// # 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. + pub fn bind<P>(path: P) -> io::Result<UnixListener> + where + P: AsRef<Path>, + { + let listener = mio::net::UnixListener::bind(path)?; + let io = PollEvented::new(listener)?; + Ok(UnixListener { io }) + } + + /// Creates new `UnixListener` from a `std::os::unix::net::UnixListener `. + /// + /// This function is intended to be used to wrap a UnixListener from the + /// standard library in the Tokio equivalent. The conversion assumes + /// nothing about the underlying listener; it is left up to the user to set + /// it in non-blocking mode. + /// + /// # 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. + pub fn from_std(listener: net::UnixListener) -> io::Result<UnixListener> { + let listener = mio::net::UnixListener::from_std(listener); + let io = PollEvented::new(listener)?; + Ok(UnixListener { io }) + } + + /// Turns a [`tokio::net::UnixListener`] into a [`std::os::unix::net::UnixListener`]. + /// + /// The returned [`std::os::unix::net::UnixListener`] 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() -> Result<(), Box<dyn Error>> { + /// let tokio_listener = tokio::net::UnixListener::bind("127.0.0.1:0")?; + /// let std_listener = tokio_listener.into_std()?; + /// std_listener.set_nonblocking(false)?; + /// Ok(()) + /// } + /// ``` + /// + /// [`tokio::net::UnixListener`]: UnixListener + /// [`std::os::unix::net::UnixListener`]: std::os::unix::net::UnixListener + /// [`set_nonblocking`]: fn@std::os::unix::net::UnixListener::set_nonblocking + pub fn into_std(self) -> io::Result<std::os::unix::net::UnixListener> { + self.io + .into_inner() + .map(|io| io.into_raw_fd()) + .map(|raw_fd| unsafe { net::UnixListener::from_raw_fd(raw_fd) }) + } + + /// Returns the local socket address of this listener. + pub fn local_addr(&self) -> io::Result<SocketAddr> { + self.io.local_addr().map(SocketAddr) + } + + /// Returns the value of the `SO_ERROR` option. + pub fn take_error(&self) -> io::Result<Option<io::Error>> { + self.io.take_error() + } + + /// Accepts a new incoming connection to this listener. + /// + /// # Cancel safety + /// + /// This method is cancel safe. If the method is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that no new connections were + /// accepted by this method. + pub async fn accept(&self) -> io::Result<(UnixStream, SocketAddr)> { + let (mio, addr) = self + .io + .registration() + .async_io(Interest::READABLE, || self.io.accept()) + .await?; + + let addr = SocketAddr(addr); + let stream = UnixStream::new(mio)?; + Ok((stream, addr)) + } + + /// Polls to accept a new incoming connection to this listener. + /// + /// If there is no connection to accept, `Poll::Pending` is returned and the + /// current task will be notified by a waker. Note that on multiple calls + /// to `poll_accept`, only the `Waker` from the `Context` passed to the most + /// recent call is scheduled to receive a wakeup. + pub fn poll_accept(&self, cx: &mut Context<'_>) -> Poll<io::Result<(UnixStream, SocketAddr)>> { + let (sock, addr) = ready!(self.io.registration().poll_read_io(cx, || self.io.accept()))?; + let addr = SocketAddr(addr); + let sock = UnixStream::new(sock)?; + Poll::Ready(Ok((sock, addr))) + } +} + +impl TryFrom<std::os::unix::net::UnixListener> for UnixListener { + type Error = io::Error; + + /// Consumes stream, returning the tokio I/O object. + /// + /// This is equivalent to + /// [`UnixListener::from_std(stream)`](UnixListener::from_std). + fn try_from(stream: std::os::unix::net::UnixListener) -> io::Result<Self> { + Self::from_std(stream) + } +} + +impl fmt::Debug for UnixListener { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + self.io.fmt(f) + } +} + +impl AsRawFd for UnixListener { + fn as_raw_fd(&self) -> RawFd { + self.io.as_raw_fd() + } +} diff --git a/third_party/rust/tokio/src/net/unix/mod.rs b/third_party/rust/tokio/src/net/unix/mod.rs new file mode 100644 index 0000000000..14cb456705 --- /dev/null +++ b/third_party/rust/tokio/src/net/unix/mod.rs @@ -0,0 +1,24 @@ +//! Unix domain socket utility types. + +// This module does not currently provide any public API, but it was +// unintentionally defined as a public module. Hide it from the documentation +// instead of changing it to a private module to avoid breakage. +#[doc(hidden)] +pub mod datagram; + +pub(crate) mod listener; + +mod split; +pub use split::{ReadHalf, WriteHalf}; + +mod split_owned; +pub use split_owned::{OwnedReadHalf, OwnedWriteHalf, ReuniteError}; + +mod socketaddr; +pub use socketaddr::SocketAddr; + +pub(crate) mod stream; +pub(crate) use stream::UnixStream; + +mod ucred; +pub use ucred::UCred; diff --git a/third_party/rust/tokio/src/net/unix/socketaddr.rs b/third_party/rust/tokio/src/net/unix/socketaddr.rs new file mode 100644 index 0000000000..48f7b96b8c --- /dev/null +++ b/third_party/rust/tokio/src/net/unix/socketaddr.rs @@ -0,0 +1,31 @@ +use std::fmt; +use std::path::Path; + +/// An address associated with a Tokio Unix socket. +pub struct SocketAddr(pub(super) mio::net::SocketAddr); + +impl SocketAddr { + /// Returns `true` if the address is unnamed. + /// + /// Documentation reflected in [`SocketAddr`] + /// + /// [`SocketAddr`]: std::os::unix::net::SocketAddr + pub fn is_unnamed(&self) -> bool { + self.0.is_unnamed() + } + + /// Returns the contents of this address if it is a `pathname` address. + /// + /// Documentation reflected in [`SocketAddr`] + /// + /// [`SocketAddr`]: std::os::unix::net::SocketAddr + pub fn as_pathname(&self) -> Option<&Path> { + self.0.as_pathname() + } +} + +impl fmt::Debug for SocketAddr { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + self.0.fmt(fmt) + } +} diff --git a/third_party/rust/tokio/src/net/unix/split.rs b/third_party/rust/tokio/src/net/unix/split.rs new file mode 100644 index 0000000000..d4686c22d7 --- /dev/null +++ b/third_party/rust/tokio/src/net/unix/split.rs @@ -0,0 +1,305 @@ +//! `UnixStream` split support. +//! +//! A `UnixStream` can be split into a read half and a write half with +//! `UnixStream::split`. The read half implements `AsyncRead` while the write +//! half implements `AsyncWrite`. +//! +//! Compared to the generic split of `AsyncRead + AsyncWrite`, this specialized +//! split has no associated overhead and enforces all invariants at the type +//! level. + +use crate::io::{AsyncRead, AsyncWrite, Interest, ReadBuf, Ready}; +use crate::net::UnixStream; + +use crate::net::unix::SocketAddr; +use std::io; +use std::net::Shutdown; +use std::pin::Pin; +use std::task::{Context, Poll}; + +cfg_io_util! { + use bytes::BufMut; +} + +/// Borrowed read half of a [`UnixStream`], created by [`split`]. +/// +/// Reading from a `ReadHalf` is usually done using the convenience methods found on the +/// [`AsyncReadExt`] trait. +/// +/// [`UnixStream`]: UnixStream +/// [`split`]: UnixStream::split() +/// [`AsyncReadExt`]: trait@crate::io::AsyncReadExt +#[derive(Debug)] +pub struct ReadHalf<'a>(&'a UnixStream); + +/// Borrowed write half of a [`UnixStream`], created by [`split`]. +/// +/// Note that in the [`AsyncWrite`] implementation of this type, [`poll_shutdown`] will +/// shut down the UnixStream stream in the write direction. +/// +/// Writing to an `WriteHalf` is usually done using the convenience methods found +/// on the [`AsyncWriteExt`] trait. +/// +/// [`UnixStream`]: UnixStream +/// [`split`]: UnixStream::split() +/// [`AsyncWrite`]: trait@crate::io::AsyncWrite +/// [`poll_shutdown`]: fn@crate::io::AsyncWrite::poll_shutdown +/// [`AsyncWriteExt`]: trait@crate::io::AsyncWriteExt +#[derive(Debug)] +pub struct WriteHalf<'a>(&'a UnixStream); + +pub(crate) fn split(stream: &mut UnixStream) -> (ReadHalf<'_>, WriteHalf<'_>) { + (ReadHalf(stream), WriteHalf(stream)) +} + +impl ReadHalf<'_> { + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// # 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`. + pub async fn ready(&self, interest: Interest) -> io::Result<Ready> { + self.0.ready(interest).await + } + + /// Waits for the socket to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// # 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`. + pub async fn readable(&self) -> io::Result<()> { + self.0.readable().await + } + + /// Tries to read data from the stream into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read(&self, buf: &mut [u8]) -> io::Result<usize> { + self.0.try_read(buf) + } + + cfg_io_util! { + /// Tries to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + pub fn try_read_buf<B: BufMut>(&self, buf: &mut B) -> io::Result<usize> { + self.0.try_read_buf(buf) + } + } + + /// Tries to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: Self::try_read() + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> { + self.0.try_read_vectored(bufs) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result<SocketAddr> { + self.0.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result<SocketAddr> { + self.0.local_addr() + } +} + +impl WriteHalf<'_> { + /// Waits for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// # 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`. + pub async fn ready(&self, interest: Interest) -> io::Result<Ready> { + self.0.ready(interest).await + } + + /// Waits for the socket to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # 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`. + pub async fn writable(&self) -> io::Result<()> { + self.0.writable().await + } + + /// Tries to write a buffer to the stream, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write(&self, buf: &[u8]) -> io::Result<usize> { + self.0.try_write(buf) + } + + /// Tries to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: Self::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write_vectored(&self, buf: &[io::IoSlice<'_>]) -> io::Result<usize> { + self.0.try_write_vectored(buf) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result<SocketAddr> { + self.0.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result<SocketAddr> { + self.0.local_addr() + } +} + +impl AsyncRead for ReadHalf<'_> { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll<io::Result<()>> { + self.0.poll_read_priv(cx, buf) + } +} + +impl AsyncWrite for WriteHalf<'_> { + fn poll_write( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll<io::Result<usize>> { + self.0.poll_write_priv(cx, buf) + } + + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll<io::Result<usize>> { + self.0.poll_write_vectored_priv(cx, bufs) + } + + fn is_write_vectored(&self) -> bool { + self.0.is_write_vectored() + } + + fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> { + Poll::Ready(Ok(())) + } + + fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> { + self.0.shutdown_std(Shutdown::Write).into() + } +} + +impl AsRef<UnixStream> for ReadHalf<'_> { + fn as_ref(&self) -> &UnixStream { + self.0 + } +} + +impl AsRef<UnixStream> for WriteHalf<'_> { + fn as_ref(&self) -> &UnixStream { + self.0 + } +} diff --git a/third_party/rust/tokio/src/net/unix/split_owned.rs b/third_party/rust/tokio/src/net/unix/split_owned.rs new file mode 100644 index 0000000000..9c3a2a4177 --- /dev/null +++ b/third_party/rust/tokio/src/net/unix/split_owned.rs @@ -0,0 +1,393 @@ +//! `UnixStream` owned split support. +//! +//! A `UnixStream` can be split into an `OwnedReadHalf` and a `OwnedWriteHalf` +//! with the `UnixStream::into_split` method. `OwnedReadHalf` implements +//! `AsyncRead` while `OwnedWriteHalf` implements `AsyncWrite`. +//! +//! Compared to the generic split of `AsyncRead + AsyncWrite`, this specialized +//! split has no associated overhead and enforces all invariants at the type +//! level. + +use crate::io::{AsyncRead, AsyncWrite, Interest, ReadBuf, Ready}; +use crate::net::UnixStream; + +use crate::net::unix::SocketAddr; +use std::error::Error; +use std::net::Shutdown; +use std::pin::Pin; +use std::sync::Arc; +use std::task::{Context, Poll}; +use std::{fmt, io}; + +cfg_io_util! { + use bytes::BufMut; +} + +/// Owned read half of a [`UnixStream`], created by [`into_split`]. +/// +/// Reading from an `OwnedReadHalf` is usually done using the convenience methods found +/// on the [`AsyncReadExt`] trait. +/// +/// [`UnixStream`]: crate::net::UnixStream +/// [`into_split`]: crate::net::UnixStream::into_split() +/// [`AsyncReadExt`]: trait@crate::io::AsyncReadExt +#[derive(Debug)] +pub struct OwnedReadHalf { + inner: Arc<UnixStream>, +} + +/// Owned write half of a [`UnixStream`], created by [`into_split`]. +/// +/// Note that in the [`AsyncWrite`] implementation of this type, +/// [`poll_shutdown`] will shut down the stream in the write direction. +/// Dropping the write half will also shut down the write half of the stream. +/// +/// Writing to an `OwnedWriteHalf` is usually done using the convenience methods +/// found on the [`AsyncWriteExt`] trait. +/// +/// [`UnixStream`]: crate::net::UnixStream +/// [`into_split`]: crate::net::UnixStream::into_split() +/// [`AsyncWrite`]: trait@crate::io::AsyncWrite +/// [`poll_shutdown`]: fn@crate::io::AsyncWrite::poll_shutdown +/// [`AsyncWriteExt`]: trait@crate::io::AsyncWriteExt +#[derive(Debug)] +pub struct OwnedWriteHalf { + inner: Arc<UnixStream>, + shutdown_on_drop: bool, +} + +pub(crate) fn split_owned(stream: UnixStream) -> (OwnedReadHalf, OwnedWriteHalf) { + let arc = Arc::new(stream); + let read = OwnedReadHalf { + inner: Arc::clone(&arc), + }; + let write = OwnedWriteHalf { + inner: arc, + shutdown_on_drop: true, + }; + (read, write) +} + +pub(crate) fn reunite( + read: OwnedReadHalf, + write: OwnedWriteHalf, +) -> Result<UnixStream, ReuniteError> { + if Arc::ptr_eq(&read.inner, &write.inner) { + write.forget(); + // This unwrap cannot fail as the api does not allow creating more than two Arcs, + // and we just dropped the other half. + Ok(Arc::try_unwrap(read.inner).expect("UnixStream: try_unwrap failed in reunite")) + } else { + Err(ReuniteError(read, write)) + } +} + +/// Error indicating that two halves were not from the same socket, and thus could +/// not be reunited. +#[derive(Debug)] +pub struct ReuniteError(pub OwnedReadHalf, pub OwnedWriteHalf); + +impl fmt::Display for ReuniteError { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!( + f, + "tried to reunite halves that are not from the same socket" + ) + } +} + +impl Error for ReuniteError {} + +impl OwnedReadHalf { + /// Attempts to put the two halves of a `UnixStream` back together and + /// recover the original socket. Succeeds only if the two halves + /// originated from the same call to [`into_split`]. + /// + /// [`into_split`]: crate::net::UnixStream::into_split() + pub fn reunite(self, other: OwnedWriteHalf) -> Result<UnixStream, ReuniteError> { + reunite(self, other) + } + + /// Waits for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// # 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`. + pub async fn ready(&self, interest: Interest) -> io::Result<Ready> { + self.inner.ready(interest).await + } + + /// Waits for the socket to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// # 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`. + pub async fn readable(&self) -> io::Result<()> { + self.inner.readable().await + } + + /// Tries to read data from the stream into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read(&self, buf: &mut [u8]) -> io::Result<usize> { + self.inner.try_read(buf) + } + + cfg_io_util! { + /// Tries to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_buf<B: BufMut>(&self, buf: &mut B) -> io::Result<usize> { + self.inner.try_read_buf(buf) + } + } + + /// Tries to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: Self::try_read() + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> { + self.inner.try_read_vectored(bufs) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result<SocketAddr> { + self.inner.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result<SocketAddr> { + self.inner.local_addr() + } +} + +impl AsyncRead for OwnedReadHalf { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll<io::Result<()>> { + self.inner.poll_read_priv(cx, buf) + } +} + +impl OwnedWriteHalf { + /// Attempts to put the two halves of a `UnixStream` back together and + /// recover the original socket. Succeeds only if the two halves + /// originated from the same call to [`into_split`]. + /// + /// [`into_split`]: crate::net::UnixStream::into_split() + pub fn reunite(self, other: OwnedReadHalf) -> Result<UnixStream, ReuniteError> { + reunite(other, self) + } + + /// Destroys the write half, but don't close the write half of the stream + /// until the read half is dropped. If the read half has already been + /// dropped, this closes the stream. + pub fn forget(mut self) { + self.shutdown_on_drop = false; + drop(self); + } + + /// Waits for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// # 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`. + pub async fn ready(&self, interest: Interest) -> io::Result<Ready> { + self.inner.ready(interest).await + } + + /// Waits for the socket to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # 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`. + pub async fn writable(&self) -> io::Result<()> { + self.inner.writable().await + } + + /// Tries to write a buffer to the stream, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write(&self, buf: &[u8]) -> io::Result<usize> { + self.inner.try_write(buf) + } + + /// Tries to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: Self::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write_vectored(&self, buf: &[io::IoSlice<'_>]) -> io::Result<usize> { + self.inner.try_write_vectored(buf) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result<SocketAddr> { + self.inner.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result<SocketAddr> { + self.inner.local_addr() + } +} + +impl Drop for OwnedWriteHalf { + fn drop(&mut self) { + if self.shutdown_on_drop { + let _ = self.inner.shutdown_std(Shutdown::Write); + } + } +} + +impl AsyncWrite for OwnedWriteHalf { + fn poll_write( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll<io::Result<usize>> { + self.inner.poll_write_priv(cx, buf) + } + + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll<io::Result<usize>> { + self.inner.poll_write_vectored_priv(cx, bufs) + } + + fn is_write_vectored(&self) -> bool { + self.inner.is_write_vectored() + } + + #[inline] + fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> { + // flush is a no-op + Poll::Ready(Ok(())) + } + + // `poll_shutdown` on a write half shutdowns the stream in the "write" direction. + fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> { + let res = self.inner.shutdown_std(Shutdown::Write); + if res.is_ok() { + Pin::into_inner(self).shutdown_on_drop = false; + } + res.into() + } +} + +impl AsRef<UnixStream> for OwnedReadHalf { + fn as_ref(&self) -> &UnixStream { + &*self.inner + } +} + +impl AsRef<UnixStream> for OwnedWriteHalf { + fn as_ref(&self) -> &UnixStream { + &*self.inner + } +} diff --git a/third_party/rust/tokio/src/net/unix/stream.rs b/third_party/rust/tokio/src/net/unix/stream.rs new file mode 100644 index 0000000000..4e7ef87b41 --- /dev/null +++ b/third_party/rust/tokio/src/net/unix/stream.rs @@ -0,0 +1,960 @@ +use crate::future::poll_fn; +use crate::io::{AsyncRead, AsyncWrite, Interest, PollEvented, ReadBuf, Ready}; +use crate::net::unix::split::{split, ReadHalf, WriteHalf}; +use crate::net::unix::split_owned::{split_owned, OwnedReadHalf, OwnedWriteHalf}; +use crate::net::unix::ucred::{self, UCred}; +use crate::net::unix::SocketAddr; + +use std::convert::TryFrom; +use std::fmt; +use std::io::{self, Read, Write}; +use std::net::Shutdown; +use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::net; +use std::path::Path; +use std::pin::Pin; +use std::task::{Context, Poll}; + +cfg_io_util! { + use bytes::BufMut; +} + +cfg_net_unix! { + /// A structure representing a connected Unix socket. + /// + /// This socket can be connected directly with `UnixStream::connect` or accepted + /// from a listener with `UnixListener::incoming`. Additionally, a pair of + /// anonymous Unix sockets can be created with `UnixStream::pair`. + /// + /// To shut down the stream in the write direction, you can call the + /// [`shutdown()`] method. This will cause the other peer to receive a read of + /// length 0, indicating that no more data will be sent. This only closes + /// the stream in one direction. + /// + /// [`shutdown()`]: fn@crate::io::AsyncWriteExt::shutdown + pub struct UnixStream { + io: PollEvented<mio::net::UnixStream>, + } +} + +impl UnixStream { + /// Connects to the socket named by `path`. + /// + /// This function will create a new Unix socket and connect to the path + /// specified, associating the returned stream with the default event loop's + /// handle. + pub async fn connect<P>(path: P) -> io::Result<UnixStream> + where + P: AsRef<Path>, + { + let stream = mio::net::UnixStream::connect(path)?; + let stream = UnixStream::new(stream)?; + + poll_fn(|cx| stream.io.registration().poll_write_ready(cx)).await?; + + if let Some(e) = stream.io.take_error()? { + return Err(e); + } + + Ok(stream) + } + + /// Waits for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// # 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 read and write to the stream on the same task without + /// splitting. + /// + /// ```no_run + /// use tokio::io::Interest; + /// use tokio::net::UnixStream; + /// use std::error::Error; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box<dyn Error>> { + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// loop { + /// let ready = stream.ready(Interest::READABLE | Interest::WRITABLE).await?; + /// + /// if ready.is_readable() { + /// let mut data = vec![0; 1024]; + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_read(&mut data) { + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// + /// } + /// + /// if ready.is_writable() { + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_write(b"hello world") { + /// Ok(n) => { + /// println!("write {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// } + /// } + /// ``` + pub async fn ready(&self, interest: Interest) -> io::Result<Ready> { + let event = self.io.registration().readiness(interest).await?; + Ok(event.ready) + } + + /// Waits for the socket to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// # 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::UnixStream; + /// use std::error::Error; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box<dyn Error>> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// let mut msg = vec![0; 1024]; + /// + /// loop { + /// // Wait for the socket to be readable + /// stream.readable().await?; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_read(&mut msg) { + /// Ok(n) => { + /// msg.truncate(n); + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// println!("GOT = {:?}", msg); + /// Ok(()) + /// } + /// ``` + pub async fn readable(&self) -> io::Result<()> { + self.ready(Interest::READABLE).await?; + Ok(()) + } + + /// Polls for read readiness. + /// + /// If the unix stream is not currently ready for reading, this method will + /// store a clone of the `Waker` from the provided `Context`. When the unix + /// stream becomes ready for reading, `Waker::wake` will be called on the + /// waker. + /// + /// Note that on multiple calls to `poll_read_ready` or `poll_read`, only + /// the `Waker` from the `Context` passed to the most recent call is + /// scheduled to receive a wakeup. (However, `poll_write_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 unix stream is not ready for reading. + /// * `Poll::Ready(Ok(()))` if the unix 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 + pub fn poll_read_ready(&self, cx: &mut Context<'_>) -> Poll<io::Result<()>> { + self.io.registration().poll_read_ready(cx).map_ok(|_| ()) + } + + /// Try to read data from the stream into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: UnixStream::readable() + /// [`ready()`]: UnixStream::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// use std::error::Error; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box<dyn Error>> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// loop { + /// // Wait for the socket to be readable + /// stream.readable().await?; + /// + /// // Creating the buffer **after** the `await` prevents it from + /// // being stored in the async task. + /// let mut buf = [0; 4096]; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_read(&mut buf) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read(&self, buf: &mut [u8]) -> io::Result<usize> { + self.io + .registration() + .try_io(Interest::READABLE, || (&*self.io).read(buf)) + } + + /// Tries to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: UnixStream::try_read() + /// [`readable()`]: UnixStream::readable() + /// [`ready()`]: UnixStream::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// use std::error::Error; + /// use std::io::{self, IoSliceMut}; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box<dyn Error>> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// loop { + /// // Wait for the socket to be readable + /// stream.readable().await?; + /// + /// // Creating the buffer **after** the `await` prevents it from + /// // being stored in the async task. + /// let mut buf_a = [0; 512]; + /// let mut buf_b = [0; 1024]; + /// let mut bufs = [ + /// IoSliceMut::new(&mut buf_a), + /// IoSliceMut::new(&mut buf_b), + /// ]; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_read_vectored(&mut bufs) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> { + self.io + .registration() + .try_io(Interest::READABLE, || (&*self.io).read_vectored(bufs)) + } + + cfg_io_util! { + /// Tries to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: UnixStream::readable() + /// [`ready()`]: UnixStream::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// use std::error::Error; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box<dyn Error>> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// loop { + /// // Wait for the socket to be readable + /// stream.readable().await?; + /// + /// let mut buf = Vec::with_capacity(4096); + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_read_buf(&mut buf) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read_buf<B: BufMut>(&self, buf: &mut B) -> io::Result<usize> { + self.io.registration().try_io(Interest::READABLE, || { + use std::io::Read; + + let dst = buf.chunk_mut(); + let dst = + unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit<u8>] as *mut [u8]) }; + + // Safety: We trust `UnixStream::read` to have filled up `n` bytes in the + // buffer. + let n = (&*self.io).read(dst)?; + + unsafe { + buf.advance_mut(n); + } + + Ok(n) + }) + } + } + + /// Waits for the socket to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # 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::UnixStream; + /// use std::error::Error; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box<dyn Error>> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// loop { + /// // Wait for the socket to be writable + /// stream.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_write(b"hello world") { + /// Ok(n) => { + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub async fn writable(&self) -> io::Result<()> { + self.ready(Interest::WRITABLE).await?; + Ok(()) + } + + /// Polls for write readiness. + /// + /// If the unix stream is not currently ready for writing, this method will + /// store a clone of the `Waker` from the provided `Context`. When the unix + /// stream becomes ready for writing, `Waker::wake` will be called on the + /// waker. + /// + /// Note that on multiple calls to `poll_write_ready` or `poll_write`, only + /// the `Waker` from the `Context` passed to the most recent call is + /// scheduled to receive a wakeup. (However, `poll_read_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 unix stream is not ready for writing. + /// * `Poll::Ready(Ok(()))` if the unix 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 + pub fn poll_write_ready(&self, cx: &mut Context<'_>) -> Poll<io::Result<()>> { + self.io.registration().poll_write_ready(cx).map_ok(|_| ()) + } + + /// Tries to write a buffer to the stream, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// use std::error::Error; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box<dyn Error>> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// loop { + /// // Wait for the socket to be writable + /// stream.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_write(b"hello world") { + /// Ok(n) => { + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_write(&self, buf: &[u8]) -> io::Result<usize> { + self.io + .registration() + .try_io(Interest::WRITABLE, || (&*self.io).write(buf)) + } + + /// Tries to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: UnixStream::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// use std::error::Error; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box<dyn Error>> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// let bufs = [io::IoSlice::new(b"hello "), io::IoSlice::new(b"world")]; + /// + /// loop { + /// // Wait for the socket to be writable + /// stream.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_write_vectored(&bufs) { + /// Ok(n) => { + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_write_vectored(&self, buf: &[io::IoSlice<'_>]) -> io::Result<usize> { + self.io + .registration() + .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) + } + + /// 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 from 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 `UnixStream` type, as this will mess with the + /// readiness flag and can cause the socket to behave incorrectly. + /// + /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: UnixStream::readable() + /// [`writable()`]: UnixStream::writable() + /// [`ready()`]: UnixStream::ready() + pub fn try_io<R>( + &self, + interest: Interest, + f: impl FnOnce() -> io::Result<R>, + ) -> io::Result<R> { + self.io.registration().try_io(interest, f) + } + + /// Creates new `UnixStream` from a `std::os::unix::net::UnixStream`. + /// + /// This function is intended to be used to wrap a UnixStream from the + /// standard library in the Tokio equivalent. The conversion assumes + /// nothing about the underlying stream; it is left up to the user to set + /// it in non-blocking mode. + /// + /// # 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. + pub fn from_std(stream: net::UnixStream) -> io::Result<UnixStream> { + let stream = mio::net::UnixStream::from_std(stream); + let io = PollEvented::new(stream)?; + + Ok(UnixStream { io }) + } + + /// Turns a [`tokio::net::UnixStream`] into a [`std::os::unix::net::UnixStream`]. + /// + /// The returned [`std::os::unix::net::UnixStream`] will have nonblocking + /// mode set as `true`. Use [`set_nonblocking`] to change the blocking + /// mode if needed. + /// + /// # Examples + /// + /// ``` + /// use std::error::Error; + /// use std::io::Read; + /// use tokio::net::UnixListener; + /// # use tokio::net::UnixStream; + /// # use tokio::io::AsyncWriteExt; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box<dyn Error>> { + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// + /// let mut data = [0u8; 12]; + /// let listener = UnixListener::bind(&bind_path)?; + /// # let handle = tokio::spawn(async { + /// # let mut stream = UnixStream::connect(bind_path).await.unwrap(); + /// # stream.write(b"Hello world!").await.unwrap(); + /// # }); + /// let (tokio_unix_stream, _) = listener.accept().await?; + /// let mut std_unix_stream = tokio_unix_stream.into_std()?; + /// # handle.await.expect("The task being joined has panicked"); + /// std_unix_stream.set_nonblocking(false)?; + /// std_unix_stream.read_exact(&mut data)?; + /// # assert_eq!(b"Hello world!", &data); + /// Ok(()) + /// } + /// ``` + /// [`tokio::net::UnixStream`]: UnixStream + /// [`std::os::unix::net::UnixStream`]: std::os::unix::net::UnixStream + /// [`set_nonblocking`]: fn@std::os::unix::net::UnixStream::set_nonblocking + pub fn into_std(self) -> io::Result<std::os::unix::net::UnixStream> { + self.io + .into_inner() + .map(|io| io.into_raw_fd()) + .map(|raw_fd| unsafe { std::os::unix::net::UnixStream::from_raw_fd(raw_fd) }) + } + + /// Creates an unnamed pair of connected sockets. + /// + /// This function will create a pair of interconnected Unix sockets for + /// communicating back and forth between one another. Each socket will + /// be associated with the default event loop's handle. + pub fn pair() -> io::Result<(UnixStream, UnixStream)> { + let (a, b) = mio::net::UnixStream::pair()?; + let a = UnixStream::new(a)?; + let b = UnixStream::new(b)?; + + Ok((a, b)) + } + + pub(crate) fn new(stream: mio::net::UnixStream) -> io::Result<UnixStream> { + let io = PollEvented::new(stream)?; + Ok(UnixStream { io }) + } + + /// Returns the socket address of the local half of this connection. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// + /// # async fn dox() -> Result<(), Box<dyn std::error::Error>> { + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// println!("{:?}", stream.local_addr()?); + /// # Ok(()) + /// # } + /// ``` + pub fn local_addr(&self) -> io::Result<SocketAddr> { + self.io.local_addr().map(SocketAddr) + } + + /// Returns the socket address of the remote half of this connection. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// + /// # async fn dox() -> Result<(), Box<dyn std::error::Error>> { + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// println!("{:?}", stream.peer_addr()?); + /// # Ok(()) + /// # } + /// ``` + pub fn peer_addr(&self) -> io::Result<SocketAddr> { + self.io.peer_addr().map(SocketAddr) + } + + /// Returns effective credentials of the process which called `connect` or `pair`. + pub fn peer_cred(&self) -> io::Result<UCred> { + ucred::get_peer_cred(self) + } + + /// Returns the value of the `SO_ERROR` option. + pub fn take_error(&self) -> io::Result<Option<io::Error>> { + self.io.take_error() + } + + /// Shuts down the read, write, or both halves of this connection. + /// + /// This function will cause all pending and future I/O calls on the + /// specified portions to immediately return with an appropriate value + /// (see the documentation of `Shutdown`). + pub(super) fn shutdown_std(&self, how: Shutdown) -> io::Result<()> { + self.io.shutdown(how) + } + + // These lifetime markers also appear in the generated documentation, and make + // it more clear that this is a *borrowed* split. + #[allow(clippy::needless_lifetimes)] + /// Splits a `UnixStream` into a read half and a write half, which can be used + /// to read and write the stream concurrently. + /// + /// This method is more efficient than [`into_split`], but the halves cannot be + /// moved into independently spawned tasks. + /// + /// [`into_split`]: Self::into_split() + pub fn split<'a>(&'a mut self) -> (ReadHalf<'a>, WriteHalf<'a>) { + split(self) + } + + /// Splits a `UnixStream` into a read half and a write half, which can be used + /// to read and write the stream concurrently. + /// + /// Unlike [`split`], the owned halves can be moved to separate tasks, however + /// this comes at the cost of a heap allocation. + /// + /// **Note:** Dropping the write half will shut down the write half of the + /// stream. This is equivalent to calling [`shutdown()`] on the `UnixStream`. + /// + /// [`split`]: Self::split() + /// [`shutdown()`]: fn@crate::io::AsyncWriteExt::shutdown + pub fn into_split(self) -> (OwnedReadHalf, OwnedWriteHalf) { + split_owned(self) + } +} + +impl TryFrom<net::UnixStream> for UnixStream { + type Error = io::Error; + + /// Consumes stream, returning the tokio I/O object. + /// + /// This is equivalent to + /// [`UnixStream::from_std(stream)`](UnixStream::from_std). + fn try_from(stream: net::UnixStream) -> io::Result<Self> { + Self::from_std(stream) + } +} + +impl AsyncRead for UnixStream { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll<io::Result<()>> { + self.poll_read_priv(cx, buf) + } +} + +impl AsyncWrite for UnixStream { + fn poll_write( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll<io::Result<usize>> { + self.poll_write_priv(cx, buf) + } + + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll<io::Result<usize>> { + self.poll_write_vectored_priv(cx, bufs) + } + + fn is_write_vectored(&self) -> bool { + true + } + + fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> { + Poll::Ready(Ok(())) + } + + fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> { + self.shutdown_std(std::net::Shutdown::Write)?; + Poll::Ready(Ok(())) + } +} + +impl UnixStream { + // == Poll IO functions that takes `&self` == + // + // To read or write without mutable access to the `UnixStream`, combine the + // `poll_read_ready` or `poll_write_ready` methods with the `try_read` or + // `try_write` methods. + + pub(crate) fn poll_read_priv( + &self, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll<io::Result<()>> { + // Safety: `UnixStream::read` correctly handles reads into uninitialized memory + unsafe { self.io.poll_read(cx, buf) } + } + + pub(crate) fn poll_write_priv( + &self, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll<io::Result<usize>> { + self.io.poll_write(cx, buf) + } + + pub(super) fn poll_write_vectored_priv( + &self, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll<io::Result<usize>> { + self.io.poll_write_vectored(cx, bufs) + } +} + +impl fmt::Debug for UnixStream { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + self.io.fmt(f) + } +} + +impl AsRawFd for UnixStream { + fn as_raw_fd(&self) -> RawFd { + self.io.as_raw_fd() + } +} diff --git a/third_party/rust/tokio/src/net/unix/ucred.rs b/third_party/rust/tokio/src/net/unix/ucred.rs new file mode 100644 index 0000000000..865303b4ce --- /dev/null +++ b/third_party/rust/tokio/src/net/unix/ucred.rs @@ -0,0 +1,252 @@ +use libc::{gid_t, pid_t, uid_t}; + +/// Credentials of a process. +#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)] +pub struct UCred { + /// PID (process ID) of the process. + pid: Option<pid_t>, + /// UID (user ID) of the process. + uid: uid_t, + /// GID (group ID) of the process. + gid: gid_t, +} + +impl UCred { + /// Gets UID (user ID) of the process. + pub fn uid(&self) -> uid_t { + self.uid + } + + /// Gets GID (group ID) of the process. + pub fn gid(&self) -> gid_t { + self.gid + } + + /// Gets PID (process ID) of the process. + /// + /// This is only implemented under Linux, Android, iOS, macOS, Solaris and + /// Illumos. On other platforms this will always return `None`. + pub fn pid(&self) -> Option<pid_t> { + self.pid + } +} + +#[cfg(any(target_os = "linux", target_os = "android", target_os = "openbsd"))] +pub(crate) use self::impl_linux::get_peer_cred; + +#[cfg(any(target_os = "netbsd"))] +pub(crate) use self::impl_netbsd::get_peer_cred; + +#[cfg(any(target_os = "dragonfly", target_os = "freebsd"))] +pub(crate) use self::impl_bsd::get_peer_cred; + +#[cfg(any(target_os = "macos", target_os = "ios"))] +pub(crate) use self::impl_macos::get_peer_cred; + +#[cfg(any(target_os = "solaris", target_os = "illumos"))] +pub(crate) use self::impl_solaris::get_peer_cred; + +#[cfg(any(target_os = "linux", target_os = "android", target_os = "openbsd"))] +pub(crate) mod impl_linux { + use crate::net::unix::UnixStream; + + use libc::{c_void, getsockopt, socklen_t, SOL_SOCKET, SO_PEERCRED}; + use std::{io, mem}; + + #[cfg(target_os = "openbsd")] + use libc::sockpeercred as ucred; + #[cfg(any(target_os = "linux", target_os = "android"))] + use libc::ucred; + + pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> { + use std::os::unix::io::AsRawFd; + + unsafe { + let raw_fd = sock.as_raw_fd(); + + let mut ucred = ucred { + pid: 0, + uid: 0, + gid: 0, + }; + + let ucred_size = mem::size_of::<ucred>(); + + // These paranoid checks should be optimized-out + assert!(mem::size_of::<u32>() <= mem::size_of::<usize>()); + assert!(ucred_size <= u32::MAX as usize); + + let mut ucred_size = ucred_size as socklen_t; + + let ret = getsockopt( + raw_fd, + SOL_SOCKET, + SO_PEERCRED, + &mut ucred as *mut ucred as *mut c_void, + &mut ucred_size, + ); + if ret == 0 && ucred_size as usize == mem::size_of::<ucred>() { + Ok(super::UCred { + uid: ucred.uid, + gid: ucred.gid, + pid: Some(ucred.pid), + }) + } else { + Err(io::Error::last_os_error()) + } + } + } +} + +#[cfg(any(target_os = "netbsd"))] +pub(crate) mod impl_netbsd { + use crate::net::unix::UnixStream; + + use libc::{c_void, getsockopt, socklen_t, unpcbid, LOCAL_PEEREID, SOL_SOCKET}; + use std::io; + use std::mem::size_of; + use std::os::unix::io::AsRawFd; + + pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> { + unsafe { + let raw_fd = sock.as_raw_fd(); + + let mut unpcbid = unpcbid { + unp_pid: 0, + unp_euid: 0, + unp_egid: 0, + }; + + let unpcbid_size = size_of::<unpcbid>(); + let mut unpcbid_size = unpcbid_size as socklen_t; + + let ret = getsockopt( + raw_fd, + SOL_SOCKET, + LOCAL_PEEREID, + &mut unpcbid as *mut unpcbid as *mut c_void, + &mut unpcbid_size, + ); + if ret == 0 && unpcbid_size as usize == size_of::<unpcbid>() { + Ok(super::UCred { + uid: unpcbid.unp_euid, + gid: unpcbid.unp_egid, + pid: Some(unpcbid.unp_pid), + }) + } else { + Err(io::Error::last_os_error()) + } + } + } +} + +#[cfg(any(target_os = "dragonfly", target_os = "freebsd"))] +pub(crate) mod impl_bsd { + use crate::net::unix::UnixStream; + + use libc::getpeereid; + use std::io; + use std::mem::MaybeUninit; + use std::os::unix::io::AsRawFd; + + pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> { + unsafe { + let raw_fd = sock.as_raw_fd(); + + let mut uid = MaybeUninit::uninit(); + let mut gid = MaybeUninit::uninit(); + + let ret = getpeereid(raw_fd, uid.as_mut_ptr(), gid.as_mut_ptr()); + + if ret == 0 { + Ok(super::UCred { + uid: uid.assume_init(), + gid: gid.assume_init(), + pid: None, + }) + } else { + Err(io::Error::last_os_error()) + } + } + } +} + +#[cfg(any(target_os = "macos", target_os = "ios"))] +pub(crate) mod impl_macos { + use crate::net::unix::UnixStream; + + use libc::{c_void, getpeereid, getsockopt, pid_t, LOCAL_PEEREPID, SOL_LOCAL}; + use std::io; + use std::mem::size_of; + use std::mem::MaybeUninit; + use std::os::unix::io::AsRawFd; + + pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> { + unsafe { + let raw_fd = sock.as_raw_fd(); + + let mut uid = MaybeUninit::uninit(); + let mut gid = MaybeUninit::uninit(); + let mut pid: MaybeUninit<pid_t> = MaybeUninit::uninit(); + let mut pid_size: MaybeUninit<u32> = MaybeUninit::new(size_of::<pid_t>() as u32); + + if getsockopt( + raw_fd, + SOL_LOCAL, + LOCAL_PEEREPID, + pid.as_mut_ptr() as *mut c_void, + pid_size.as_mut_ptr(), + ) != 0 + { + return Err(io::Error::last_os_error()); + } + + assert!(pid_size.assume_init() == (size_of::<pid_t>() as u32)); + + let ret = getpeereid(raw_fd, uid.as_mut_ptr(), gid.as_mut_ptr()); + + if ret == 0 { + Ok(super::UCred { + uid: uid.assume_init(), + gid: gid.assume_init(), + pid: Some(pid.assume_init()), + }) + } else { + Err(io::Error::last_os_error()) + } + } + } +} + +#[cfg(any(target_os = "solaris", target_os = "illumos"))] +pub(crate) mod impl_solaris { + use crate::net::unix::UnixStream; + use std::io; + use std::os::unix::io::AsRawFd; + use std::ptr; + + pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> { + unsafe { + let raw_fd = sock.as_raw_fd(); + + let mut cred = ptr::null_mut(); + let ret = libc::getpeerucred(raw_fd, &mut cred); + + if ret == 0 { + let uid = libc::ucred_geteuid(cred); + let gid = libc::ucred_getegid(cred); + let pid = libc::ucred_getpid(cred); + + libc::ucred_free(cred); + + Ok(super::UCred { + uid, + gid, + pid: Some(pid), + }) + } else { + Err(io::Error::last_os_error()) + } + } + } +} |