AlarmHandler.h

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// -*- mode: c++; c-basic-offset:4 -*-
 
// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.
 
// Copyright (c) 2002,2003 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
 
#ifndef alarm_handler_h
#define alarm_handler_h
 
#include <cstdio>
 
#include <string>
 
#include "EventHandler.h"
 
namespace libdap {

class AlarmHandler : public EventHandler {
private:
    FILE *d_file; // Sink for the Error object.
    string d_version;
 
public:
    // Ensure that d_stream gets initialized...
    AlarmHandler() : d_file(0) {}
 
    explicit AlarmHandler(FILE *s)
        : d_file(s) //, d_stream( cout )
    {}

    explicit AlarmHandler(ostream &) : d_file(0) {}
 
    virtual ~AlarmHandler() {
        if (d_file)
            fclose(d_file);
    }

    virtual void handle_signal(int signum) {
        if (signum != SIGALRM)
            throw Error("SIGALRM handler caught another signal!");
 
        throw Error("Timeout");
    }
};
 
} // namespace libdap
 
#endif