Daemon.h

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/*
 * Daemon.h
 *
 * Smalltalk like class library for C++
 * Abstract daemon application. Header.
 *
 * Copyright (c) 2004 Milan Cermak
 */
/*
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __DAEMON_H
#define __DAEMON_H

#include <stlib/tools/Application.h>

#include <stlib/String.h>

namespace Tools {

class Filename;

class Daemon : public Application
{
  protected:
    bool close_std_streams;
    bool change_current_directory;
    String *pid_path;

  public:
    Daemon(void);

    /* Accessing protocol */
    virtual String *name(void) abstract;

    virtual String *processIdPath(void);
    virtual void processIdPath(String *path);

    virtual void redirectStreamsToNull(void);
    virtual void changeRootDirectory(void);

    virtual void runUnderUser(int id);
    virtual void runUnderUserNamed(String *name);

    /* Signaling protocol */
    virtual void hookupSignal(int signo);
    virtual void hookupTerminateSignal(void);
    virtual void hookupInterruptSignal(void);

    virtual void signalHandler(int signo) abstract;

    /* Processing protocol */
    virtual void run(void);

  protected:
    /* Private protocol */
    virtual Filename *processIdFilename(void);
    virtual int loadProcessId(void);
    virtual void saveProcessId(void);

  private:
    static void globalSignalHandler(int signo);
};

};

#endif /* __DAEMON_H */

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