peripheralmanager/daemon/char_device.h

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SYSTEM_PERIPHERALMANAGER_DAEMON_CHAR_DEVICE_H_
#define SYSTEM_PERIPHERALMANAGER_DAEMON_CHAR_DEVICE_H_

#include <poll.h>
#include <stdlib.h>

#include <memory>

namespace android {

// Used to wrap the interface to a char device file.
// This can then be stubbed out and used in unittests.
class CharDeviceInterface {
 public:
  CharDeviceInterface(){};
  virtual ~CharDeviceInterface(){};

  virtual int Open(const char* pathname, int flags) = 0;
  virtual int Close(int fd) = 0;
  virtual int Ioctl(int fd, int request, void* argp) = 0;
  virtual ssize_t Read(int fd, void* buf, size_t count) = 0;
  virtual ssize_t Write(int fd, const void* buf, size_t count) = 0;
  virtual int Poll(struct pollfd* fds, nfds_t nfds, int timeout) = 0;
};

class CharDevice : public CharDeviceInterface {
 public:
  CharDevice();
  ~CharDevice() override;

  int Open(const char* pathname, int flags) override;
  int Close(int fd) override;
  int Ioctl(int fd, int request, void* argp) override;
  ssize_t Read(int fd, void* buf, size_t count) override;
  ssize_t Write(int fd, const void* buf, size_t count) override;
  int Poll(struct pollfd* fds, nfds_t nfds, int timeout) override;
};

class CharDeviceFactory {
 public:
  CharDeviceFactory() {}
  virtual ~CharDeviceFactory() {}

  virtual std::unique_ptr<CharDeviceInterface> NewCharDevice() = 0;
};

}  // namespace android

#endif  // SYSTEM_PERIPHERALMANAGER_DAEMON_CHAR_DEVICE_H_