[NaCl SDK] Support non blocking TCP/UDP

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>
 
 #include <deque>
 
 #include "nacl_io/ioctl.h"
 #include "nacl_io/mount_node_char.h"
 #include "nacl_io/ostermios.h"
 
 
 namespace nacl_io {
 
 class MountNodeTty : public MountNodeCharDevice {
  public:
   explicit MountNodeTty(Mount* mount);
-  ~MountNodeTty();
+
+  virtual EventEmitter* GetEventEmitter();
 
   virtual Error Ioctl(int request,
                       char* arg);
 
   virtual Error Read(size_t offs,
                      void* buf,
                      size_t count,
                      int* out_bytes);
 
   virtual Error Write(size_t offs,
                       const void* buf,
                       size_t count,
                       int* out_bytes);
 
   virtual Error Tcgetattr(struct termios* termios_p);
   virtual Error Tcsetattr(int optional_actions,
                           const struct termios *termios_p);
 
-  virtual uint32_t GetEventStatus() {
-    uint32_t status = POLLOUT;
-    if (is_readable_)
-      status |= POLLIN;
-    return status;
-  }
+ private:
+  ScopedEventEmitter emitter_;
 
- private:
   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_;
-  pthread_cond_t is_readable_cond_;
   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