Dup now ereturns original FD

src/main.rs

@@ -4,7 +4,7 @@ use std::{
     borrow::Cow,
     fs::File,
     os::mikros::{ipc, syscalls, Errno, FileOpenMode},
-    sync::Arc, usize,
+    sync::Arc,
 };
 
 use ext2::Ext2;
@@ -90,10 +90,7 @@ impl file_rpc::Server for Serv {
     }
 
     fn dup(&self, fd: u64)  -> Result<u64, Errno> {
-        let mut files = self.files.write();
-        let file = files[fd as usize].clone();
-        files.push(file);
-        Ok((files.len() - 1) as u64)
+        Ok(fd)
     }
 
     fn seek(&self, fd: u64, pos: file_rpc::SeekFrom) -> Result<u64, Errno> {