Bug fixes for fcntl and o_cloexec

Add fcntl to schemes
Fix debug: hang

src/context/context.rs

@@ -239,7 +239,7 @@ impl Context {
     pub fn get_file(&self, i: FileHandle) -> Option<File> {
         let files = self.files.lock();
         if i.into() < files.len() {
-            files[i.into()]
+            files[i.into()].clone()
         } else {
             None
         }

src/context/file.rs

@@ -4,7 +4,7 @@ use scheme::SchemeId;
 
 /// A file
 //TODO: Close on exec
-#[derive(Copy, Clone, Debug)]
+#[derive(Clone, Debug)]
 pub struct File {
     /// The scheme that this file refers to
     pub scheme: SchemeId,