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