[NaCl SDK] Support non blocking TCP/UDP

native_client_sdk/src/libraries/nacl_io/event_emitter_tty.cc

+// 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.
+
+#include <poll.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "nacl_io/event_emitter_tty.h"
+
+namespace nacl_io {
+
+EventEmitterTTY::EventEmitterTTY(size_t size)
+    : fifo_(std::max<size_t>(1, size)) {
+  UpdateStatus_Locked();
+}
+
+size_t EventEmitterPipe::Read_Locked(char* data, size_t len) {
+  size_t out_len = fifo_.Read(data, len);
+
+  UpdateStatus_Locked();
+  return out_len;
+}
+
+size_t EventEmitterPipe::Write_Locked(const char* data, size_t len) {
+  size_t out_len = fifo_.Write(data, len);
+
+  UpdateStatus_Locked();
+  return out_len;
+}
+
+}  // namespace nacl_io
+