/*
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* Copyright (c) 2017 Facebook, Inc.
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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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#pragma once
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#include <unistd.h>
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namespace ebpf {
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/// FileDesc is a helper class for managing open file descriptors. Copy is
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/// disallowed (call dup instead), and cleanup happens automatically.
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class FileDesc {
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public:
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explicit FileDesc(int fd = -1) : fd_(fd) {}
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FileDesc(FileDesc &&that) : fd_(-1) { *this = std::move(that); }
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FileDesc(const FileDesc &that) = delete;
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~FileDesc() {
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if (fd_ >= 0)
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::close(fd_);
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}
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FileDesc &operator=(int fd) {
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if (fd_ >= 0)
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::close(fd_);
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fd_ = fd;
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return *this;
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}
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FileDesc &operator=(FileDesc &&that) {
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if (fd_ >= 0)
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::close(fd_);
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fd_ = that.fd_;
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that.fd_ = -1;
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return *this;
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}
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FileDesc &operator=(const FileDesc &that) = delete;
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FileDesc dup() const {
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int dup_fd = ::dup(fd_);
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return FileDesc(dup_fd);
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}
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operator int() { return fd_; }
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operator int() const { return fd_; }
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private:
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int fd_;
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};
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} // namespace ebpf
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