/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef NETUTILS_UNIQUEFD_H
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#define NETUTILS_UNIQUEFD_H
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#include <unistd.h>
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#include <ostream>
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#include "netdutils/Fd.h"
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namespace android {
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namespace netdutils {
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// Stricter unique_fd implementation that:
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// *) Does not implement release()
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// *) Does not implicitly cast to int
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// *) Uses a strongly typed wrapper (Fd) for the underlying file descriptor
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//
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// Users of UniqueFd should endeavor to treat this as a completely
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// opaque object. The only code that should interpret the wrapped
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// value is in Syscalls.h
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class UniqueFd {
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public:
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UniqueFd() = default;
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UniqueFd(Fd fd) : mFd(fd) {}
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~UniqueFd() { reset(); }
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// Disallow copy
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UniqueFd(const UniqueFd&) = delete;
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UniqueFd& operator=(const UniqueFd&) = delete;
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// Allow move
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UniqueFd(UniqueFd&& other) { std::swap(mFd, other.mFd); }
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UniqueFd& operator=(UniqueFd&& other) {
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std::swap(mFd, other.mFd);
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return *this;
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}
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// Cleanup any currently owned Fd, replacing it with the optional
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// parameter fd
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void reset(Fd fd = Fd());
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// Implict cast to Fd
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operator const Fd &() const { return mFd; }
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private:
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Fd mFd;
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};
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std::ostream& operator<<(std::ostream& os, const UniqueFd& fd);
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} // namespace netdutils
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} // namespace android
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#endif /* NETUTILS_UNIQUEFD_H */
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