/*

 *

 *    Copyright (c) 2024 Project CHIP Authors

 *

 *    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.

 */

#pragma once

#include <unistd.h>

#include <utility>

namespace chip {

/// Unix file descriptor wrapper with RAII semantics.

class FileDescriptor

{

public:

    FileDescriptor() = default;

    explicit FileDescriptor(int fd) : mFd(fd) {}

    ~FileDescriptor() { Close(); }

    /// Disallow copy and assignment.

    FileDescriptor(const FileDescriptor &)             = delete;

    FileDescriptor & operator=(const FileDescriptor &) = delete;

    FileDescriptor(FileDescriptor && other) noexcept : mFd(other.Release()) {}

    FileDescriptor & operator=(FileDescriptor && other) noexcept

    {

        Close();

        mFd = other.Release();

        return *this;

    }

    int Get() const { return mFd; }

    int Release() { return std::exchange(mFd, -1); }

    int Close()

    {

        if (mFd != -1)

        {

            return close(std::exchange(mFd, -1));

        }

        return 0;

    }

private:

    int mFd = -1;

};

} // namespace chip