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60 lines
1.7 KiB
60 lines
1.7 KiB
// Copyright 2018 The Chromium OS 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 LIBBRILLO_BRILLO_DBUS_FILE_DESCRIPTOR_H_
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#define LIBBRILLO_BRILLO_DBUS_FILE_DESCRIPTOR_H_
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#include <utility>
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#include <base/files/scoped_file.h>
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#include <base/macros.h>
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namespace brillo {
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namespace dbus_utils {
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// This struct wraps file descriptors to give them a type other than int.
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// Implicit conversions are provided because this should be as transparent
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// a wrapper as possible to match the libchrome bindings below when this
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// class is used by chromeos-dbus-bindings.
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//
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// Because we might pass these around and the calling code neither passes
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// ownership nor knows when this will be destroyed, it actually dups the FD
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// so that the calling code and binding code both have a clear handle on the
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// lifetimes of their respective copies of the FD.
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struct FileDescriptor {
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FileDescriptor() = default;
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FileDescriptor(int fd) : fd(dup(fd)) {}
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FileDescriptor(FileDescriptor&& other) : fd(std::move(other.fd)) {}
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FileDescriptor(base::ScopedFD&& other) : fd(std::move(other)) {}
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inline FileDescriptor& operator=(int new_fd) {
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fd.reset(dup(new_fd));
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return *this;
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}
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FileDescriptor& operator=(FileDescriptor&& other) {
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fd = std::move(other.fd);
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return *this;
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}
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FileDescriptor& operator=(base::ScopedFD&& other) {
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fd = std::move(other);
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return *this;
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}
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int release() { return fd.release(); }
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int get() const { return fd.get(); }
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private:
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DISALLOW_COPY_AND_ASSIGN(FileDescriptor);
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base::ScopedFD fd;
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};
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} // namespace dbus_utils
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} // namespace brillo
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#endif // LIBBRILLO_BRILLO_DBUS_FILE_DESCRIPTOR_H_
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