net: implement AsRawFd for TcpStream (#94)

Author: dpc

src/net/tcp/stream.rs

@@ -1,4 +1,8 @@
-use std::{io, net::SocketAddr};
+use std::{
+    io,
+    net::SocketAddr,
+    os::unix::prelude::{AsRawFd, RawFd},
+};
 
 use crate::{
     buf::{IoBuf, IoBufMut},
@@ -58,3 +62,9 @@ impl TcpStream {
         self.inner.write(buf).await
     }
 }
+
+impl AsRawFd for TcpStream {
+    fn as_raw_fd(&self) -> RawFd {
+        self.inner.as_raw_fd()
+    }
+}