Adds support for UnixStream and UnixListener on Windows

Cargo.toml

@@ -48,13 +48,17 @@ log = "0.4.8"
 [target.'cfg(unix)'.dependencies]
 libc = "0.2.121"
 
+[target.'cfg(windows)'.dependencies]
+tempfile = "3"
+
 [target.'cfg(windows)'.dependencies.windows-sys]
 version = "0.36"
 features = [
   "Win32_Storage_FileSystem",         # Enables NtCreateFile
   "Win32_Foundation",                 # Basic types eg HANDLE
   "Win32_Networking_WinSock",         # winsock2 types/functions
   "Win32_System_IO",                  # IO types like OVERLAPPED etc
+  "Win32_System_Threading",           # Process utilities
   "Win32_System_WindowsProgramming",  # General future used for various types/funcs
 ]
 

src/net/mod.rs

@@ -33,7 +33,11 @@ mod udp;
 #[cfg(not(target_os = "wasi"))]
 pub use self::udp::UdpSocket;
 
-#[cfg(unix)]
+#[cfg(any(unix, windows))]
 mod uds;
+#[cfg(any(unix, windows))]
+pub use self::uds::{SocketAddr, UnixListener, UnixStream};
 #[cfg(unix)]
-pub use self::uds::{SocketAddr, UnixDatagram, UnixListener, UnixStream};
+pub use self::uds::UnixDatagram;
+#[cfg(windows)]
+pub use self::uds::stdnet;

src/net/uds/listener.rs

@@ -2,8 +2,14 @@ use crate::io_source::IoSource;
 use crate::net::{SocketAddr, UnixStream};
 use crate::{event, sys, Interest, Registry, Token};
 
+#[cfg(unix)]
 use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+#[cfg(unix)]
 use std::os::unix::net;
+#[cfg(windows)]
+use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};
+#[cfg(windows)]
+use crate::sys::uds::{stdnet as net};
 use std::path::Path;
 use std::{fmt, io};
 
@@ -79,18 +85,21 @@ impl fmt::Debug for UnixListener {
     }
 }
 
+#[cfg(unix)]
 impl IntoRawFd for UnixListener {
     fn into_raw_fd(self) -> RawFd {
         self.inner.into_inner().into_raw_fd()
     }
 }
 
+#[cfg(unix)]
 impl AsRawFd for UnixListener {
     fn as_raw_fd(&self) -> RawFd {
         self.inner.as_raw_fd()
     }
 }
 
+#[cfg(unix)]
 impl FromRawFd for UnixListener {
     /// Converts a `RawFd` to a `UnixListener`.
     ///
@@ -102,3 +111,24 @@ impl FromRawFd for UnixListener {
         UnixListener::from_std(FromRawFd::from_raw_fd(fd))
     }
 }
+
+#[cfg(windows)]
+impl IntoRawSocket for UnixListener {
+    fn into_raw_socket(self) -> RawSocket {
+        self.inner.into_inner().into_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl AsRawSocket for UnixListener {
+    fn as_raw_socket(&self) -> RawSocket {
+        self.inner.as_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl FromRawSocket for UnixListener {
+    unsafe fn from_raw_socket(sock: RawSocket) -> Self {
+        UnixListener::from_std(FromRawSocket::from_raw_socket(sock))
+    }
+}

src/net/uds/mod.rs

@@ -1,4 +1,6 @@
+#[cfg(unix)]
 mod datagram;
+#[cfg(unix)]
 pub use self::datagram::UnixDatagram;
 
 mod listener;
@@ -8,3 +10,6 @@ mod stream;
 pub use self::stream::UnixStream;
 
 pub use crate::sys::SocketAddr;
+
+#[cfg(windows)]
+pub use crate::sys::uds::stdnet;

src/net/uds/stream.rs

@@ -4,8 +4,14 @@ use crate::{event, sys, Interest, Registry, Token};
 use std::fmt;
 use std::io::{self, IoSlice, IoSliceMut, Read, Write};
 use std::net::Shutdown;
+#[cfg(unix)]
 use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+#[cfg(unix)]
 use std::os::unix::net;
+#[cfg(windows)]
+use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};
+#[cfg(windows)]
+use crate::sys::uds::{stdnet as net};
 use std::path::Path;
 
 /// A non-blocking Unix stream socket.
@@ -220,18 +226,21 @@ impl fmt::Debug for UnixStream {
     }
 }
 
+#[cfg(unix)]
 impl IntoRawFd for UnixStream {
     fn into_raw_fd(self) -> RawFd {
         self.inner.into_inner().into_raw_fd()
     }
 }
 
+#[cfg(unix)]
 impl AsRawFd for UnixStream {
     fn as_raw_fd(&self) -> RawFd {
         self.inner.as_raw_fd()
     }
 }
 
+#[cfg(unix)]
 impl FromRawFd for UnixStream {
     /// Converts a `RawFd` to a `UnixStream`.
     ///
@@ -243,3 +252,24 @@ impl FromRawFd for UnixStream {
         UnixStream::from_std(FromRawFd::from_raw_fd(fd))
     }
 }
+
+#[cfg(windows)]
+impl IntoRawSocket for UnixStream {
+    fn into_raw_socket(self) -> RawSocket {
+        self.inner.into_inner().into_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl AsRawSocket for UnixStream {
+    fn as_raw_socket(&self) -> RawSocket {
+        self.inner.as_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl FromRawSocket for UnixStream {
+    unsafe fn from_raw_socket(sock: RawSocket) -> Self {
+        UnixStream::from_std(FromRawSocket::from_raw_socket(sock))
+    }
+}

src/sys/mod.rs

@@ -59,7 +59,7 @@ cfg_os_poll! {
 
 #[cfg(windows)]
 cfg_os_poll! {
-    mod windows;
+    pub mod windows;
     pub use self::windows::*;
 }
 
@@ -83,4 +83,9 @@ cfg_not_os_poll! {
     cfg_net! {
         pub use self::unix::SocketAddr;
     }
+
+    #[cfg(windows)]
+    cfg_net! {
+        pub use self::windows::SocketAddr;
+    }
 }

src/sys/windows/mod.rs

@@ -31,10 +31,28 @@ cfg_net! {
         }};
     }
 
+    macro_rules! wsa_syscall {
+        ($fn: ident ( $($arg: expr),* $(,)* ), $err_test: path, $err_value: expr) => {{
+            let res = unsafe { $fn($($arg, )*) };
+            if $err_test(&res, &$err_value) {
+                use windows_sys::Win32::Networking::WinSock::WSAGetLastError;
+                Err(io::Error::from_raw_os_error(unsafe {
+                    WSAGetLastError()
+                }))
+            } else {
+                Ok(res)
+            }
+        }};
+    }
+
     mod net;
 
     pub(crate) mod tcp;
     pub(crate) mod udp;
+    pub mod uds;
+    pub use self::uds::SocketAddr;
+    #[cfg(all(windows, test))]
+    pub use self::uds::stdnet;
 }
 
 cfg_os_ext! {

src/sys/windows/uds/listener.rs

@@ -0,0 +1,70 @@
+use std::{io, mem};
+use std::convert::TryInto;
+use std::os::windows::io::{AsRawSocket, FromRawSocket};
+use std::path::Path;
+use std::os::raw::c_int;
+use windows_sys::Win32::Networking::WinSock::{
+    self,
+    SOCKET_ERROR,
+    INVALID_SOCKET,
+    bind as sys_bind,
+    listen,
+    accept as sys_accept
+};
+
+use super::stdnet::{self as net, socket_addr};
+use crate::net::{SocketAddr, UnixStream};
+use crate::sys::windows::net::{init, new_socket};
+
+pub(crate) fn bind(path: &Path) -> io::Result<net::UnixListener> {
+    init();
+    let socket = new_socket(WinSock::AF_UNIX.into(), WinSock::SOCK_STREAM)?;
+    let (sockaddr, socklen) = socket_addr(path)?;
+    let sockaddr = &sockaddr as *const WinSock::sockaddr_un as *const WinSock::SOCKADDR;
+
+    wsa_syscall!(sys_bind(socket, sockaddr, socklen as _), PartialEq::eq, SOCKET_ERROR)
+        .and_then(|_| wsa_syscall!(listen(socket, 128), PartialEq::eq, SOCKET_ERROR))
+        .map_err(|err| {
+            // Close the socket if we hit an error, ignoring the error from
+            // closing since we can't pass back two errors.
+            let _ = unsafe { WinSock::closesocket(socket) };
+            err
+        })
+        .map(|_| unsafe { net::UnixListener::from_raw_socket(socket.try_into().unwrap()) })
+}
+
+pub(crate) fn accept(listener: &net::UnixListener) -> io::Result<(UnixStream, SocketAddr)> {
+    let sockaddr = mem::MaybeUninit::<WinSock::sockaddr_un>::zeroed();
+
+    // This is safe to assume because a `WinSock::sockaddr_un` filled with `0`
+    // bytes is properly initialized.
+    //
+    // `0` is a valid value for `sockaddr_un::sun_family`; it is
+    // `WinSock::AF_UNSPEC`.
+    //
+    // `[0; 108]` is a valid value for `sockaddr_un::sun_path`; it begins an
+    // abstract path.
+    let mut sockaddr = unsafe { sockaddr.assume_init() };
+
+    sockaddr.sun_family = WinSock::AF_UNIX;
+    let mut socklen = mem::size_of_val(&sockaddr) as c_int;
+
+    let socket = wsa_syscall!(
+        sys_accept(
+            listener.as_raw_socket().try_into().unwrap(),
+            &mut sockaddr as *mut WinSock::sockaddr_un as *mut WinSock::SOCKADDR,
+            &mut socklen as _
+        ),
+        PartialEq::eq,
+        INVALID_SOCKET
+    );
+
+    socket
+        .map(|socket| unsafe { net::UnixStream::from_raw_socket(socket.try_into().unwrap()) })
+        .map(UnixStream::from_std)
+        .map(|stream| (stream, SocketAddr::from_parts(sockaddr, socklen)))
+}
+
+pub(crate) fn local_addr(listener: &net::UnixListener) -> io::Result<SocketAddr> {
+    super::local_addr(listener.as_raw_socket())
+}

src/sys/windows/uds/mod.rs

@@ -0,0 +1,36 @@
+pub mod stdnet;
+pub use self::stdnet::SocketAddr;
+
+cfg_os_poll! {
+    use std::convert::TryInto;
+    use windows_sys::Win32::Networking::WinSock::{
+        getsockname,
+        getpeername,
+        SOCKET_ERROR
+    };
+    use std::os::windows::io::RawSocket;
+    use std::io;
+
+    pub(crate) mod listener;
+    pub(crate) mod stream;
+
+    pub(crate) fn local_addr(socket: RawSocket) -> io::Result<SocketAddr> {
+        SocketAddr::new(|sockaddr, socklen| {
+            wsa_syscall!(
+                getsockname(socket.try_into().unwrap(), sockaddr, socklen),
+                PartialEq::eq,
+                SOCKET_ERROR
+            )
+        })
+    }
+
+    pub(crate) fn peer_addr(socket: RawSocket) -> io::Result<SocketAddr> {
+        SocketAddr::new(|sockaddr, socklen| {
+            wsa_syscall!(
+                getpeername(socket.try_into().unwrap(), sockaddr, socklen),
+                PartialEq::eq,
+                SOCKET_ERROR
+            )
+        })
+    }
+}