UnixSignalService.cc

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/*----------------------------------------------------------------------
 
 UnixSignalService: At present, this defines a SIGUSR2 handler and
 sets the shutdown flag when that signal has been raised.
 
 This service is instantiated at job startup.
 
 ----------------------------------------------------------------------*/
#include <iostream>
#include <cstdlib>
 
#include "FWCore/ServiceRegistry/interface/ServiceMaker.h"
 
#include "FWCore/ParameterSet/interface/ParameterSet.h"
 
#include "FWCore/Utilities/interface/UnixSignalHandlers.h"
#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
 
namespace edm {
  namespace service {
    class UnixSignalService {
    public:
      explicit UnixSignalService(ParameterSet const& ps);
      ~UnixSignalService();
 
      static void fillDescriptions(ConfigurationDescriptions& descriptions);
 
    private:
      bool enableSigInt_;
    };  // class UnixSignalService
  }     // end of namespace service
}  // end of namespace edm
 
namespace edm {
 
  namespace service {
 
    UnixSignalService::UnixSignalService(ParameterSet const& pset)
        : enableSigInt_(pset.getUntrackedParameter<bool>("EnableCtrlC")) {
      installCustomHandler(SIGUSR2, ep_sigusr2);
      if (enableSigInt_)
        installCustomHandler(SIGINT, ep_sigusr2);
    }
 
    UnixSignalService::~UnixSignalService() {}
 
    void UnixSignalService::fillDescriptions(ConfigurationDescriptions& descriptions) {
      ParameterSetDescription desc;
      desc.addUntracked<bool>("EnableCtrlC", true)
          ->setComment(
              "If 'true', you can stop a cmsRun job gracefully by sending it a '<control> c' keyboard interrupt (i.e. "
              "SIGINT).");
      descriptions.add("UnixSignalService", desc);
      descriptions.setComment(
          "This service sets up unix signal handlers for the unix signal SIGUSR2 and optionally SIGINT"
          " so that when cmsRun is sent a signal the application will stop processing and shut down gracefully.");
    }
  }  // end of namespace service
}  // end of namespace edm
 
using edm::service::UnixSignalService;
typedef edm::serviceregistry::ParameterSetMaker<UnixSignalService> UnixSignalMaker;
DEFINE_FWK_SERVICE_MAKER(UnixSignalService, UnixSignalMaker);