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

native_client_sdk/src/libraries/nacl_io/mount_node_tty.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef LIBRARIES_NACL_IO_MOUNT_NODE_TTY_H_
 #define LIBRARIES_NACL_IO_MOUNT_NODE_TTY_H_
 
 #include <poll.h>
 #include <pthread.h>
 
@@ skipping 40 matching lines @@
                       const void* buf,
                       size_t count,
                       int* out_bytes,
                       bool locked);
   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_;
+  /// Current height of terminal in rows.
+  int rows_;
+  /// Current width of terminal in columns.
+  int cols_;
 };
 
 }
 
 #endif