[NaCl SDK] Support non blocking TCP/UDP

native_client_sdk/src/libraries/nacl_io/event_emitter_tcp.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 "nacl_io/event_emitter_tcp.h"
+
+#include <poll.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "nacl_io/fifo_char.h"
+#include "sdk_util/auto_lock.h"
+
+namespace nacl_io {
+
+EventEmitterTCP::EventEmitterTCP(size_t rsize, size_t wsize)
+    : rx_fifo_(std::max<size_t>(65536, rsize)),
+      tx_fifo_(std::max<size_t>(65536, wsize)) {
+  UpdateStatus_Locked();
+}
+
+uint32_t EventEmitterTCP::ReadRXBytes_Locked(char* data, uint32_t len) {
+  uint32_t count = rx_fifo_.Read(data, len);
+
+  UpdateStatus_Locked();
+  return count;
+}
+
+uint32_t EventEmitterTCP::WriteRXBytes_Locked(const char* data, uint32_t len) {
+  uint32_t count = rx_fifo_.Write(data, len);
+
+  UpdateStatus_Locked();
+  return count;
+}
+
+uint32_t EventEmitterTCP::ReadTXBytes_Locked(char* data, uint32_t len) {
+  uint32_t count = tx_fifo_.Read(data, len);
+
+  UpdateStatus_Locked();
+  return count;
+}
+
+uint32_t EventEmitterTCP::WriteTXBytes_Locked(const char* data, uint32_t len) {
+  uint32_t count = tx_fifo_.Write(data, len);
+
+  UpdateStatus_Locked();
+  return count;
+}
+
+
+}  // namespace nacl_io
+
+