[NaCl SDK] Support non blocking TCP/UDP

native_client_sdk/src/libraries/nacl_io/mount_node_stream.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_STREAM_H_
+#define LIBRARIES_NACL_IO_MOUNT_NODE_STREAM_H_
+
+#include <map>
+#include <string>
+
+#include "nacl_io/event_emitter_pipe.h"
+#include "nacl_io/mount_node.h"
+
+namespace nacl_io {
+
+class MountNodeStream : public MountNode {
+ public:
+  explicit MountNodeStream(Mount* mnt);
+
+  virtual Error Init(int perm);
+
+  virtual EventEmitter* GetEventEmitter() = 0;
+  virtual Error Read(size_t offs, void *buf, size_t count, int* out_bytes) = 0;
+  virtual Error Write(size_t offs, const void *buf,
+                      size_t count, int* out_bytes) = 0;
+
+protected:
+  Error WaitOnEvent(uint32_t events, int ms);
+
+  int read_timeout_;
+  int write_timeout_;
+
+  friend class KernelProxy;
+  friend class MountStream;
+};
+
+
+}  // namespace nacl_io
+
+#endif  // LIBRARIES_NACL_IO_MOUNT_NODE_STREAM_H_