Fix compilation

src/smolnetd/scheme/icmp.rs

@@ -269,4 +269,3 @@ impl<'a, 'b> SchemeSocket for IcmpSocket<'a, 'b> {
         }
     }
 }
-

src/smolnetd/scheme/socket.rs

@@ -106,10 +106,10 @@ type WaitQueue = Vec<WaitHandle>;
 
 type WaitQueueMap = BTreeMap<SocketHandle, WaitQueue>;
 
-pub type DupResult<T> = (
+pub type DupResult<T> = Option<(
     SchemeFile<T>,
     Option<(SocketHandle, <T as SchemeSocket>::DataT)>,
-);
+)>;
 
 pub trait SchemeSocket
 where
@@ -639,12 +639,15 @@ where
                     }),
                     None,
                 ),
-                _ => SocketT::dup(
+                _ => match SocketT::dup(
                     &mut self.socket_set.borrow_mut(),
                     file,
                     path,
                     &mut self.scheme_data,
-                )?,
+                )? {
+                    Some(some) => some,
+                    None => return Ok(None),
+                },
             };
 
             if let Some((socket_handle, data)) = update_with {

src/smolnetd/scheme/tcp.rs

@@ -162,7 +162,7 @@ impl<'a> SchemeSocket for TcpSocket<'a> {
                     if tcp_handle.flags & syscall::O_NONBLOCK == syscall::O_NONBLOCK {
                         return Err(SyscallError::new(syscall::EAGAIN));
                     } else {
-                        Ok(None);
+                        return Ok(None);
                     }
                 }
                 trace!("TCP creating new listening socket");
@@ -181,7 +181,7 @@ impl<'a> SchemeSocket for TcpSocket<'a> {
                         .expect("Can't listen on local endpoint");
                 }
                 port_set.acquire_port(local_endpoint.port);
-                return Ok((new_handle, Some((new_socket_handle, ()))));
+                return Ok(Some((new_handle, Some((new_socket_handle, ())))));
             } else {
                 return Err(SyscallError::new(syscall::EBADF));
             },
@@ -199,7 +199,7 @@ impl<'a> SchemeSocket for TcpSocket<'a> {
             port_set.acquire_port(local_endpoint.port);
         }
 
-        Ok((file, None))
+        Ok(Some((file, None)))
     }
 
     fn fpath(&self, _: &SchemeFile<Self>, buf: &mut [u8]) -> SyscallResult<usize> {

src/smolnetd/scheme/udp.rs

@@ -171,7 +171,7 @@ impl<'a, 'b> SchemeSocket for UdpSocket<'a, 'b> {
             port_set.acquire_port(endpoint.port);
         }
 
-        Ok((file, None))
+        Ok(Some((file, None)))
     }
 
     fn fpath(&self, file: &SchemeFile<Self>, buf: &mut [u8]) -> SyscallResult<usize> {