Add sys scheme to allow inspection of processes. WIP: Signals.

kernel/context/context.rs

@@ -55,6 +55,8 @@ pub struct Context {
     pub stack: Option<Memory>,
     /// User grants
     pub grants: Arc<Mutex<Vec<Grant>>>,
+    /// The name of the context
+    pub name: Arc<Mutex<Vec<u8>>>,
     /// The current working directory
     pub cwd: Arc<Mutex<Vec<u8>>>,
     /// Kernel events
@@ -87,6 +89,7 @@ impl Context {
             heap: None,
             stack: None,
             grants: Arc::new(Mutex::new(Vec::new())),
+            name: Arc::new(Mutex::new(Vec::new())),
             cwd: Arc::new(Mutex::new(Vec::new())),
             events: Arc::new(WaitQueue::new()),
             env: Arc::new(Mutex::new(BTreeMap::new())),