| use crate::io_source::IoSource; |
| use crate::{event, sys, Interest, Registry, Token}; |
| |
| use std::net::Shutdown; |
| use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; |
| use std::os::unix::net; |
| use std::path::Path; |
| use std::{fmt, io}; |
| |
| /// A Unix datagram socket. |
| pub struct UnixDatagram { |
| inner: IoSource<net::UnixDatagram>, |
| } |
| |
| impl UnixDatagram { |
| /// Creates a Unix datagram socket bound to the given path. |
| pub fn bind<P: AsRef<Path>>(path: P) -> io::Result<UnixDatagram> { |
| sys::uds::datagram::bind(path.as_ref()).map(UnixDatagram::from_std) |
| } |
| |
| /// Creates a new `UnixDatagram` from a standard `net::UnixDatagram`. |
| /// |
| /// This function is intended to be used to wrap a Unix datagram from the |
| /// standard library in the Mio equivalent. The conversion assumes nothing |
| /// about the underlying datagram; it is left up to the user to set it in |
| /// non-blocking mode. |
| pub fn from_std(socket: net::UnixDatagram) -> UnixDatagram { |
| UnixDatagram { |
| inner: IoSource::new(socket), |
| } |
| } |
| |
| /// Connects the socket to the specified address. |
| /// |
| /// This may return a `WouldBlock` in which case the socket connection |
| /// cannot be completed immediately. |
| pub fn connect<P: AsRef<Path>>(&self, path: P) -> io::Result<()> { |
| self.inner.connect(path) |
| } |
| |
| /// Creates a Unix Datagram socket which is not bound to any address. |
| pub fn unbound() -> io::Result<UnixDatagram> { |
| sys::uds::datagram::unbound().map(UnixDatagram::from_std) |
| } |
| |
| /// Create an unnamed pair of connected sockets. |
| pub fn pair() -> io::Result<(UnixDatagram, UnixDatagram)> { |
| sys::uds::datagram::pair().map(|(socket1, socket2)| { |
| ( |
| UnixDatagram::from_std(socket1), |
| UnixDatagram::from_std(socket2), |
| ) |
| }) |
| } |
| |
| /// Returns the address of this socket. |
| pub fn local_addr(&self) -> io::Result<sys::SocketAddr> { |
| sys::uds::datagram::local_addr(&self.inner) |
| } |
| |
| /// Returns the address of this socket's peer. |
| /// |
| /// The `connect` method will connect the socket to a peer. |
| pub fn peer_addr(&self) -> io::Result<sys::SocketAddr> { |
| sys::uds::datagram::peer_addr(&self.inner) |
| } |
| |
| /// Receives data from the socket. |
| /// |
| /// On success, returns the number of bytes read and the address from |
| /// whence the data came. |
| pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, sys::SocketAddr)> { |
| self.inner |
| .do_io(|inner| sys::uds::datagram::recv_from(inner, buf)) |
| } |
| |
| /// Receives data from the socket. |
| /// |
| /// On success, returns the number of bytes read. |
| pub fn recv(&self, buf: &mut [u8]) -> io::Result<usize> { |
| self.inner.do_io(|inner| inner.recv(buf)) |
| } |
| |
| /// Sends data on the socket to the specified address. |
| /// |
| /// On success, returns the number of bytes written. |
| pub fn send_to<P: AsRef<Path>>(&self, buf: &[u8], path: P) -> io::Result<usize> { |
| self.inner.do_io(|inner| inner.send_to(buf, path)) |
| } |
| |
| /// Sends data on the socket to the socket's peer. |
| /// |
| /// The peer address may be set by the `connect` method, and this method |
| /// will return an error if the socket has not already been connected. |
| /// |
| /// On success, returns the number of bytes written. |
| pub fn send(&self, buf: &[u8]) -> io::Result<usize> { |
| self.inner.do_io(|inner| inner.send(buf)) |
| } |
| |
| /// Returns the value of the `SO_ERROR` option. |
| pub fn take_error(&self) -> io::Result<Option<io::Error>> { |
| self.inner.take_error() |
| } |
| |
| /// Shut 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 fn shutdown(&self, how: Shutdown) -> io::Result<()> { |
| self.inner.shutdown(how) |
| } |
| |
| /// Execute an I/O operation ensuring that the socket receives more events |
| /// if it hits a [`WouldBlock`] error. |
| /// |
| /// # Notes |
| /// |
| /// This method is required to be called for **all** I/O operations to |
| /// ensure the user will receive events once the socket is ready again after |
| /// returning a [`WouldBlock`] error. |
| /// |
| /// [`WouldBlock`]: io::ErrorKind::WouldBlock |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use std::error::Error; |
| /// # |
| /// # fn main() -> Result<(), Box<dyn Error>> { |
| /// use std::io; |
| /// use std::os::unix::io::AsRawFd; |
| /// use mio::net::UnixDatagram; |
| /// |
| /// let (dgram1, dgram2) = UnixDatagram::pair()?; |
| /// |
| /// // Wait until the dgram is writable... |
| /// |
| /// // Write to the dgram using a direct libc call, of course the |
| /// // `io::Write` implementation would be easier to use. |
| /// let buf = b"hello"; |
| /// let n = dgram1.try_io(|| { |
| /// let buf_ptr = &buf as *const _ as *const _; |
| /// let res = unsafe { libc::send(dgram1.as_raw_fd(), buf_ptr, buf.len(), 0) }; |
| /// if res != -1 { |
| /// Ok(res as usize) |
| /// } else { |
| /// // If EAGAIN or EWOULDBLOCK is set by libc::send, the closure |
| /// // should return `WouldBlock` error. |
| /// Err(io::Error::last_os_error()) |
| /// } |
| /// })?; |
| /// eprintln!("write {} bytes", n); |
| /// |
| /// // Wait until the dgram is readable... |
| /// |
| /// // Read from the dgram using a direct libc call, of course the |
| /// // `io::Read` implementation would be easier to use. |
| /// let mut buf = [0; 512]; |
| /// let n = dgram2.try_io(|| { |
| /// let buf_ptr = &mut buf as *mut _ as *mut _; |
| /// let res = unsafe { libc::recv(dgram2.as_raw_fd(), buf_ptr, buf.len(), 0) }; |
| /// if res != -1 { |
| /// Ok(res as usize) |
| /// } else { |
| /// // If EAGAIN or EWOULDBLOCK is set by libc::recv, the closure |
| /// // should return `WouldBlock` error. |
| /// Err(io::Error::last_os_error()) |
| /// } |
| /// })?; |
| /// eprintln!("read {} bytes", n); |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| pub fn try_io<F, T>(&self, f: F) -> io::Result<T> |
| where |
| F: FnOnce() -> io::Result<T>, |
| { |
| self.inner.do_io(|_| f()) |
| } |
| } |
| |
| impl event::Source for UnixDatagram { |
| fn register( |
| &mut self, |
| registry: &Registry, |
| token: Token, |
| interests: Interest, |
| ) -> io::Result<()> { |
| self.inner.register(registry, token, interests) |
| } |
| |
| fn reregister( |
| &mut self, |
| registry: &Registry, |
| token: Token, |
| interests: Interest, |
| ) -> io::Result<()> { |
| self.inner.reregister(registry, token, interests) |
| } |
| |
| fn deregister(&mut self, registry: &Registry) -> io::Result<()> { |
| self.inner.deregister(registry) |
| } |
| } |
| |
| impl fmt::Debug for UnixDatagram { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| self.inner.fmt(f) |
| } |
| } |
| |
| impl IntoRawFd for UnixDatagram { |
| fn into_raw_fd(self) -> RawFd { |
| self.inner.into_inner().into_raw_fd() |
| } |
| } |
| |
| impl AsRawFd for UnixDatagram { |
| fn as_raw_fd(&self) -> RawFd { |
| self.inner.as_raw_fd() |
| } |
| } |
| |
| impl FromRawFd for UnixDatagram { |
| /// Converts a `RawFd` to a `UnixDatagram`. |
| /// |
| /// # Notes |
| /// |
| /// The caller is responsible for ensuring that the socket is in |
| /// non-blocking mode. |
| unsafe fn from_raw_fd(fd: RawFd) -> UnixDatagram { |
| UnixDatagram::from_std(FromRawFd::from_raw_fd(fd)) |
| } |
| } |
