[NaCl SDK] Support non blocking TCP/UDP

native_client_sdk/src/libraries/nacl_io/event_emitter_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_EVENT_EMITTER_TTY_H_
+#define LIBRARIES_NACL_IO_EVENT_EMITTER_TTY_H_
+
+#include <poll.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "nacl_io/event_emitter_stream.h"
+#include "nacl_io/fifo_char.h"
+#include "nacl_io/fifo_null.h"
+
+#include "sdk_util/auto_lock.h"
+#include "sdk_util/macros.h"
+
+namespace nacl_io {
+
+class EventEmitterTTY;
+typedef sdk_util::ScopedRef<EventEmitterTTY> ScopedEventEmitterTTY;
+
+class EventEmitterTTY : public EventEmitterStream {
+ public:
+  explicit EventEmitterTTY(size_t size);
+
+  size_t Read_Locked(char* data, size_t len);
+  size_t Write_Locked(const char* data, size_t len);
+
+  virtual FIFOChar* in_fifo() { return &fifo_; }
+  virtual FIFONull* out_fifo() { return &null_; }
+
+ private:
+  FIFOChar fifo_;
+  FIFONull null_;
+  DISALLOW_COPY_AND_ASSIGN(EventEmitterTTY);
+};
+
+}  // namespace nacl_io
+
+#endif  // LIBRARIES_NACL_IO_EVENT_EMITTER_PIPE_H_
+