SocketPair.h

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/*
 * Copyright 2014-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

namespace folly {

class SocketPair {
 public:
  enum Mode { BLOCKING, NONBLOCKING };

  explicit SocketPair(Mode mode = NONBLOCKING);
  ~SocketPair();

  int operator[](int index) const {
    return fds_[index];
  }

  void closeFD0();
  void closeFD1();

  int extractFD0() {
    return extractFD(0);
  }
  int extractFD1() {
    return extractFD(1);
  }
  int extractFD(int index) {
    int fd = fds_[index];
    fds_[index] = -1;
    return fd;
  }

 private:
  int fds_[2];
};

} // namespace folly