dev_null.h

// Copyright 2012 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef DEV_NULL_H
#define DEV_NULL_H

#include "file_interfaces.h"
#include "pthread_helpers.h"

class DevNullHandler : public PathHandler {
 public:
  DevNullHandler();
  virtual ~DevNullHandler();

  virtual void addref();
  virtual void release();

  virtual FileStream* open(int fd, const char* pathname, int oflag, int* err);
  virtual int stat(const char* pathname, nacl_abi_stat* out);

 private:
  int ref_;

  DISALLOW_COPY_AND_ASSIGN(DevNullHandler);
};

class DevNull : public FileStream {
 public:
  DevNull(int fd, int oflag);
  virtual ~DevNull();

  virtual void addref();
  virtual void release();
  virtual FileStream* dup(int fd);

  virtual void close();
  virtual int read(char* buf, size_t count, size_t* nread);
  virtual int write(const char* buf, size_t count, size_t* nwrote);

  virtual int fcntl(int cmd,  va_list ap);

 private:
  int fd_;
  int oflag_;
  int ref_;

  DISALLOW_COPY_AND_ASSIGN(DevNull);
};

#endif  // DEV_NULL_H