Support I/O Safety types and traits: AsSocket, BorrowedSocket, OwnedS…

…ocket

This allows callers of uds_windows to potentially avoid having to use
the Raw types and traits.

This also allows the use of uds_windows with upcoming changes to
async-io to use AsFd.

Get compiling from old PR; add AsSocket for UnixStream

Cargo format

src/stdnet/net.rs

@@ -3,7 +3,9 @@ use std::io;
 use std::mem;
 use std::net::Shutdown;
 use std::os::raw::c_int;
-use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};
+use std::os::windows::io::{
+    AsRawSocket, AsSocket, BorrowedSocket, FromRawSocket, IntoRawSocket, RawSocket,
+};
 use std::path::Path;
 use std::time::Duration;
 
@@ -298,6 +300,12 @@ impl<'a> io::Write for &'a UnixStream {
     }
 }
 
+impl AsSocket for UnixStream {
+    fn as_socket(&self) -> BorrowedSocket {
+        self.0.as_socket()
+    }
+}
+
 impl AsRawSocket for UnixStream {
     fn as_raw_socket(&self) -> RawSocket {
         self.0.as_raw_socket()

src/stdnet/socket.rs

@@ -4,7 +4,9 @@ use std::io;
 use std::mem;
 use std::net::Shutdown;
 use std::os::raw::{c_int, c_ulong};
-use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};
+use std::os::windows::io::{
+    AsRawSocket, AsSocket, BorrowedSocket, FromRawSocket, IntoRawSocket, OwnedSocket, RawSocket,
+};
 use std::ptr;
 use std::sync::Once;
 use std::time::Duration;
@@ -298,3 +300,21 @@ impl IntoRawSocket for Socket {
         ret
     }
 }
+
+impl AsSocket for Socket {
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        unsafe { BorrowedSocket::borrow_raw(self.as_raw_socket()) }
+    }
+}
+
+impl From<Socket> for OwnedSocket {
+    fn from(sock: Socket) -> OwnedSocket {
+        unsafe { OwnedSocket::from_raw_socket(sock.into_raw_socket()) }
+    }
+}
+
+impl From<OwnedSocket> for Socket {
+    fn from(owned: OwnedSocket) -> Socket {
+        unsafe { Socket::from_raw_socket(owned.into_raw_socket()) }
+    }
+}