signal_set.h

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// Copyright (C) 2014-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef SIGNAL_SET_H
#define SIGNAL_SET_H

#include <exceptions/exceptions.h>
#include <boost/function.hpp>
#include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp>
#include <set>
#include <list>
#include <pthread.h>
#include <signal.h>

namespace isc {
namespace util {

class SignalSetError : public Exception {
public:
    SignalSetError(const char* file, size_t line, const char* what) :
        isc::Exception(file, line, what) { };
};


typedef std::set<int> SigIntSet;
typedef boost::shared_ptr<SigIntSet> SigIntSetPtr;

typedef std::list<int> SigIntList;
typedef boost::shared_ptr<SigIntList> SigIntListPtr;


class SignalSet;
typedef boost::shared_ptr<SignalSet> SignalSetPtr;
typedef boost::function<void(int signum)> SignalHandler;

typedef boost::function<bool(int signum)> BoolSignalHandler;

class SignalSet : public boost::noncopyable {
public:
    SignalSet(const int sig0);

    SignalSet(const int sig0, const int sig1);

    SignalSet(const int sig0, const int sig1, const int sig2);

    ~SignalSet();

    void add(const int sig);

    void clear();

    int getNext() const;

    void handleNext(SignalHandler signal_handler);

    void remove(const int sig);

    static void setOnReceiptHandler(BoolSignalHandler handler);

    static void clearOnReceiptHandler();

    static bool invokeOnReceiptHandler(int sig);

private:

    void block() const;

    void erase(const int sig);

    void insert(const int sig);

    void maskSignals(const int mask) const;

    void popNext();

    void unblock() const;

    std::set<int> local_signals_;

    SigIntSetPtr registered_signals_;

    SigIntListPtr signal_states_;
};

}
}

#endif // SIGNAL_SET_H