daemon_unix.h

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//                            Package   : omniEvents
// daemon_unix.h              Created   : 2004/06/26
//                            Author    : Alex Tingle
//
//    Copyright (C) 2004 Alex Tingle.
//
//    This file is part of the omniEvents application.
//
//    omniEvents 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.
//
//    omniEvents 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 OMNIEVENTS__DAEMON_UNIX_H
#define OMNIEVENTS__DAEMON_UNIX_H

#ifdef __WIN32__
#  error("This file is not intended for Windows.")
#endif

namespace OmniEvents {

class DaemonImpl
{
public:
  static DaemonImpl _inst;

  char* _tracefile;   
  bool  _foreground;  
  char* _pidfile;     
  int   _pipe[2];     
  bool  _havePidfile; 
  bool  _haveParent;  
  bool  _haveSyslog;  

  DaemonImpl();
  ~DaemonImpl();

  void tracefile(const char* val); 
  void pidfile(const char* val);   
  void foreground(bool val);       

  void initialize(int&,char**&);

  void daemonize();

  void runningOk();

  void shutdown(int status);

  static void log(const char* message);

private:
  void fork();

  void redirectStreamsTo(const char* filename);

  int openFileFor(int fd, const char* filename, int flags);

  void checkPidfileOrShutdown();

  void writePidfile();

  int waitForChild();
  
  void notifyParent(int status);
};

} // end namespace OmniEvents

#endif // OMNIEVENTS__DAEMON_UNIX_H

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