common/call_wrapper_interface.h

//
// Copyright (C) 2022 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 UPDATE_ENGINE_COMMON_CALL_WRAPPER_INTERFACE_H_
#define UPDATE_ENGINE_COMMON_CALL_WRAPPER_INTERFACE_H_

#include <memory>

#include <base/files/file_path.h>

namespace chromeos_update_engine {

// The abstract call_wrapper interface used mainly to intercept libc or system
// calls for testing.
class CallWrapperInterface {
 public:
  CallWrapperInterface(const CallWrapperInterface&) = delete;
  CallWrapperInterface& operator=(const CallWrapperInterface&) = delete;

  virtual ~CallWrapperInterface() = default;

  virtual int64_t AmountOfFreeDiskSpace(const base::FilePath& path) = 0;

 protected:
  CallWrapperInterface() = default;
};

// This factory function creates a new CallWrapperInterface instance for the
// current platform.
std::unique_ptr<CallWrapperInterface> CreateCallWrapper();

}  // namespace chromeos_update_engine

#endif  // UPDATE_ENGINE_COMMON_CALL_WRAPPER_INTERFACE_H_