dft_tools/triqs/utility/signal_handler.cpp

/*******************************************************************************
 *
 * TRIQS: a Toolbox for Research in Interacting Quantum Systems
 *
 * Copyright (C) 2014 by O. Parcollet
 *
 * TRIQS is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * TRIQS 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * TRIQS. If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/
#include "signal_handler.hpp"
#include <signal.h>
#include <string.h>
#include <vector>
#include <iostream>
namespace triqs {
namespace signal_handler {

 namespace {

  std::vector<int> signals_list;
  bool initialized = false;

  void slot(int signal) {
   std::cerr << "TRIQS : Received signal " << signal << std::endl;
   signals_list.push_back(signal);
  }
 }

 void start() {
  if (initialized) return;
  static struct sigaction action;
  memset(&action, 0, sizeof(action));
  action.sa_handler = slot;
  sigaction(SIGINT, &action, NULL);
  sigaction(SIGTERM, &action, NULL);
  sigaction(SIGXCPU, &action, NULL);
  sigaction(SIGQUIT, &action, NULL);
  sigaction(SIGUSR1, &action, NULL);
  sigaction(SIGUSR2, &action, NULL);
  sigaction(SIGSTOP, &action, NULL);
  initialized = true;
 }

 void stop() {
  signals_list.clear();
  initialized = false;
 }

 bool received(bool pop_) {
  if (!initialized) start();
  bool r = signals_list.size() != 0;
  if (r && pop_) pop();
  return r;
 }

 int last() { return signals_list.back(); }
 void pop() { return signals_list.pop_back(); }
}
}