timeval.h

网络流量采集及分析软件

/*  \file   Timeval.h

    Copyright 2003-2004 Fraunhofer Institute for Open Communication Systems (FOKUS),
                        Berlin, Germany

    This file is part of Network Measurement and Accounting System (NETMATE).

    NETMATE is free software; you can redistribute it and/or modify 
    it under the terms of the GNU General Public License as published by 
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    NETMATE 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this software; if not, write to the Free Software 
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Description:
    functions for comparing, adding and subtracting timevals

    $Id: Timeval.h,v 1.2 2005/12/05 07:17:25 s_zander Exp $
*/

#ifndef _TIMEVAL_H_
#define _TIMEVAL_H_


#include "stdincpp.h"


class Timeval
{
  private:
    static struct timeval g_time;
    static int onlineCap;

  public:

    /*! \short compare t1 and t2
        \returns -1 if t1<t2, 0 if t1=t2 or +1 if t1>t2
    */
    static int cmp(struct timeval t1, struct timeval t2);

    //! add timval a and b and return the result
    static struct timeval add(struct timeval a, struct timeval b);

    //! subtract timval sub from timeval num and return result; if result < 0 return 0
    static struct timeval sub0(struct timeval num, struct timeval sub);

    //! function for reading the current time
    //  the time will either be the current system time or the time derived
    //  from a pcap trace file 
    static int gettimeofday(struct timeval *tv, struct timezone *tz); 
    static time_t time(time_t *t);

    //! set the time (used when reading the time from a pcap file)
    // return 0 if ok and -1 if time is in the past (reordering)
    static int settimeofday(const struct timeval *tv);

    //! set the capture mode: 1 = online, 0 = offline
    static void setCapMode(int oc)
      {
	onlineCap = oc;
      }
};

#endif // _TIMEVAL_H_