Handle poll interrupt gracefully

src/tun2proxy.rs

@@ -673,7 +673,8 @@ impl<'a> TunToProxy<'a> {
         let mut events = Events::with_capacity(1024);
 
         loop {
-            self.poll.poll(&mut events, None)?;
+            match self.poll.poll(&mut events, None) {
+                Ok(()) => {
                     for event in events.iter() {
                         match event.token() {
                             TCP_TOKEN => self.tun_event(event)?,
@@ -683,5 +684,12 @@ impl<'a> TunToProxy<'a> {
                     }
                     self.send_to_smoltcp()?;
                 }
+                Err(e) => {
+                    if e.kind() != std::io::ErrorKind::Interrupted {
+                        return Err(e.into())
+                    }
+                }
+            }
+        }
     }
 }