/*
 * Copyright © 2014 Canonical Ltd.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Authored by: Kevin DuBois <kevin.dubois@canonical.com>
 */

#ifndef ANBOX_COMMON_FD_H_
#define ANBOX_COMMON_FD_H_

#include <memory>

namespace anbox {
struct IntOwnedFd {
  int int_owned_fd;
};
class Fd {
 public:
  // transfer ownership of the POD-int to the object. The int no longer needs
  // close()ing,
  // and has the lifetime of the Fd object.
  explicit Fd(int fd);
  explicit Fd(IntOwnedFd);
  static int const invalid{-1};
  Fd();  // Initializes fd to the anbox::Fd::invalid;
  Fd(Fd&&);
  Fd(Fd const&) = default;
  Fd& operator=(Fd);

  // bit of a convenient kludge. take care not to close or otherwise destroy the
  // FD.
  operator int() const;

 private:
  std::shared_ptr<int> fd;
};
}  // namespace anbox

#endif