[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 29 matching lines @@
                           const struct termios *termios_p);
 
   virtual uint32_t GetEventStatus() {
     uint32_t status = POLLOUT;
     if (is_readable_)
       status |= POLLIN;
     return status;
   }
 
  private:
-  virtual Error Write(size_t offs,
-                      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.  Set via ioctl(2).
+  int rows_;
+  /// Current width of terminal in columns.  Set via ioctl(2).
+  int cols_;
+
+  // Output handler for TTY.  This is set via ioctl(2).
+  struct tioc_nacl_output output_handler_;
+  // Lock to protect output_handler_.  This lock gets aquired whenever
+  // output_handler_ is used or set.
+  sdk_util::SimpleLock output_lock_;
 };
 
 }
 
 #endif