/**
 * Copyright (c) 2016-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

#if defined(__APPLE__)
#define CAFFE2_SUPPORTS_SIGNAL_HANDLER
#elif defined(__linux__) && !defined(CAFFE2_DISABLE_SIGNAL_HANDLERS)
#define CAFFE2_SUPPORTS_FATAL_SIGNAL_HANDLERS
#define CAFFE2_SUPPORTS_SIGNAL_HANDLER
#endif

namespace caffe2 {

class SignalHandler {
 public:
  enum class Action {
    NONE,
    STOP
  };

  // Contructor. Specify what action to take when a signal is received.
  SignalHandler(Action SIGINT_action,
                Action SIGHUP_action);
  ~SignalHandler();

  Action CheckForSignals();

 private:
  bool GotSIGINT();
  bool GotSIGHUP();
  Action SIGINT_action_;
  Action SIGHUP_action_;
  unsigned long my_sigint_count_;
  unsigned long my_sighup_count_;
};

#if defined(CAFFE2_SUPPORTS_FATAL_SIGNAL_HANDLERS)
// This works by setting up certain fatal signal handlers. Previous fatal
// signal handlers will still be called when the signal is raised. Defaults
// to being off.
void setPrintStackTracesOnFatalSignal(bool print);
bool printStackTracesOnFatalSignal();
#endif // defined(CAFFE2_SUPPORTS_SIGNAL_HANDLER)

}  // namespace caffe2
