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/*
* Copyright (C) 2017 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 NETUTILS_UNIQUEFD_H
#define NETUTILS_UNIQUEFD_H
#include <unistd.h>
#include <ostream>
#include "netdutils/Fd.h"
namespace android {
namespace netdutils {
// Stricter unique_fd implementation that:
// *) Does not implement release()
// *) Does not implicitly cast to int
// *) Uses a strongly typed wrapper (Fd) for the underlying file descriptor
//
// Users of UniqueFd should endeavor to treat this as a completely
// opaque object. The only code that should interpret the wrapped
// value is in Syscalls.h
class UniqueFd {
public:
UniqueFd() = default;
UniqueFd(Fd fd) : mFd(fd) {}
~UniqueFd() { reset(); }
// Disallow copy
UniqueFd(const UniqueFd&) = delete;
UniqueFd& operator=(const UniqueFd&) = delete;
// Allow move
UniqueFd(UniqueFd&& other) { std::swap(mFd, other.mFd); }
UniqueFd& operator=(UniqueFd&& other) {
std::swap(mFd, other.mFd);
return *this;
}
// Cleanup any currently owned Fd, replacing it with the optional
// parameter fd
void reset(Fd fd = Fd());
// Implict cast to Fd
operator const Fd &() const { return mFd; }
private:
Fd mFd;
};
std::ostream& operator<<(std::ostream& os, const UniqueFd& fd);
} // namespace netdutils
} // namespace android
#endif /* NETUTILS_UNIQUEFD_H */
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