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72 lines
1.9 KiB
72 lines
1.9 KiB
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef PLATFORM_IMPL_SCOPED_PIPE_H_
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#define PLATFORM_IMPL_SCOPED_PIPE_H_
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#include <unistd.h>
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#include <utility>
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namespace openscreen {
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struct IntFdTraits {
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using PipeType = int;
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static constexpr int kInvalidValue = -1;
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static void Close(PipeType pipe) { close(pipe); }
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};
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// This class wraps file descriptor and uses RAII to ensure it is closed
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// properly when control leaves its scope. It is parameterized by a traits type
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// which defines the value type of the file descriptor, an invalid value, and a
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// closing function.
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//
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// This class is move-only as it represents ownership of the wrapped file
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// descriptor. It is not thread-safe.
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template <typename Traits>
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class ScopedPipe {
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public:
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using PipeType = typename Traits::PipeType;
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ScopedPipe() : pipe_(Traits::kInvalidValue) {}
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explicit ScopedPipe(PipeType pipe) : pipe_(pipe) {}
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ScopedPipe(const ScopedPipe&) = delete;
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ScopedPipe(ScopedPipe&& other) : pipe_(other.release()) {}
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~ScopedPipe() {
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if (pipe_ != Traits::kInvalidValue)
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Traits::Close(release());
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}
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ScopedPipe& operator=(ScopedPipe&& other) {
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if (pipe_ != Traits::kInvalidValue)
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Traits::Close(release());
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pipe_ = other.release();
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return *this;
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}
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PipeType get() const { return pipe_; }
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PipeType release() {
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PipeType pipe = pipe_;
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pipe_ = Traits::kInvalidValue;
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return pipe;
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}
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bool operator==(const ScopedPipe& other) const {
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return pipe_ == other.pipe_;
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}
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bool operator!=(const ScopedPipe& other) const { return !(*this == other); }
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explicit operator bool() const { return pipe_ != Traits::kInvalidValue; }
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private:
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PipeType pipe_;
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};
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using ScopedFd = ScopedPipe<IntFdTraits>;
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} // namespace openscreen
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#endif // PLATFORM_IMPL_SCOPED_PIPE_H_
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