[NaCl SDK] nacl_io: Add initial implementations of kill and signal

native_client_sdk/src/libraries/nacl_io/mount_node_tty.h

Index: native_client_sdk/src/libraries/nacl_io/mount_node_tty.h
diff --git a/native_client_sdk/src/libraries/nacl_io/mount_node_tty.h b/native_client_sdk/src/libraries/nacl_io/mount_node_tty.h
index 87c8191506d3fd0b0b7bb10479defd83afac9c00..898a89cbe58960ace9a4bc3d4716318dc3430ff3 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount_node_tty.h
+++ b/native_client_sdk/src/libraries/nacl_io/mount_node_tty.h
@@ -47,20 +47,24 @@ class MountNodeTty : public MountNodeCharDevice {
   }
 
  private:
-  virtual Error Write(size_t offs,
+  Error WriteWithLock(size_t offs,
                       const void* buf,
                       size_t count,
-                      int* out_bytes,
-                      bool locked);
+                      int* out_bytes);
   Error ProcessInput(struct tioc_nacl_input_string* message);
   Error Echo(const char* string, int count);
   void InitTermios();
 
   std::deque<char> input_buffer_;
   bool is_readable_;
+  bool did_resize_;
   pthread_cond_t is_readable_cond_;
-  std::string prefix_;
   struct termios termios_;
+  nacl_io_tty_output_handler_t output_handler_;
+  /// Current height of terminal in rows.
+  int rows_;
+  /// Current width of terminal in columns.
+  int cols_;
 };
 
 }