Cleanup Redox repo, update Rust, remove old target

kernel/src/scheme/null.rs

@@ -0,0 +1,37 @@
+use syscall::error::*;
+use syscall::scheme::Scheme;
+
+pub struct NullScheme;
+
+impl Scheme for NullScheme {
+    fn open(&self, _path: &[u8], _flags: usize, _uid: u32, _gid: u32) -> Result<usize> {
+        Ok(0)
+    }
+
+    fn dup(&self, _file: usize, _buf: &[u8]) -> Result<usize> {
+        Ok(0)
+    }
+
+    /// Read the file `number` into the `buffer`
+    ///
+    /// Returns the number of bytes read
+    fn read(&self, _file: usize, _buf: &mut [u8]) -> Result<usize> {
+        Ok(0)
+    }
+
+    /// Write the `buffer` to the `file`
+    ///
+    /// Returns the number of bytes written
+    fn write(&self, _file: usize, buffer: &[u8]) -> Result<usize> {
+        Ok(buffer.len())
+    }
+
+    fn fsync(&self, _file: usize) -> Result<usize> {
+        Ok(0)
+    }
+
+    /// Close the file `number`
+    fn close(&self, _file: usize) -> Result<usize> {
+        Ok(0)
+    }
+}