forked from osmocom/wireshark
bb21d8c03c
The code used to rely on min_time==0 to determine whether this was the first packet or not and whereby we had to initialize min_time to the current value. This obviously does not work for capture files with poor timestamp resolution where the response time is actually, according to the capture file, 0 and we got all sorts of weird effects like average response time being less than the minimum response time. note, the bug only affected the minimum response time in the tables and not max or average response time. it would "miss" tose minimum response times that were ==0 and display the minumin response time in the capture that were >0 svn path=/trunk/; revision=8358
131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
/* timestats.c
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* routines for time statistics
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* Copyrigth 2003 Lars Roland
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*
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* $Id: timestats.c,v 1.2 2003/09/03 10:10:17 sahlberg Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "timestats.h"
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/*
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* function: get_timedelta
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* delta = b - a
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*/
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void get_timedelta(nstime_t *delta, nstime_t *b, nstime_t *a )
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{
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delta->secs = b->secs - a->secs;
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delta->nsecs= b->nsecs - a->nsecs;
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if(delta->nsecs<0){
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delta->nsecs+=1000000000;
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delta->secs--;
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}
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}
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/*
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* function: addtime
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* sum += a
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*/
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void addtime(nstime_t *sum, nstime_t *a)
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{
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sum->secs += a->secs;
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sum->nsecs += a->nsecs;
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if(sum->nsecs>1000000000){
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sum->nsecs-=1000000000;
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sum->secs++;
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}
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}
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/*
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* function: nstime_to_msec
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* converts nstime to gdouble, time base is milli seconds
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*/
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gdouble nstime_to_msec(nstime_t *time)
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{
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return ((double)time->secs*1000 + (double)time->nsecs/1000000);
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}
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/* A Function to update a timestat_t struct with a new sample*/
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void
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time_stat_update(timestat_t *stats, nstime_t *delta, packet_info *pinfo)
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{
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if(stats->num==0){
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stats->max.secs=delta->secs;
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stats->max.nsecs=delta->nsecs;
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stats->max_num=pinfo->fd->num;
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}
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if(stats->num==0){
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stats->min.secs=delta->secs;
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stats->min.nsecs=delta->nsecs;
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stats->min_num=pinfo->fd->num;
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}
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if( (delta->secs<stats->min.secs)
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||( (delta->secs==stats->min.secs)
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&&(delta->nsecs<stats->min.nsecs) ) ){
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stats->min.secs=delta->secs;
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stats->min.nsecs=delta->nsecs;
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stats->min_num=pinfo->fd->num;
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}
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if( (delta->secs>stats->max.secs)
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||( (delta->secs==stats->max.secs)
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&&(delta->nsecs>stats->max.nsecs) ) ){
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stats->max.secs=delta->secs;
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stats->max.nsecs=delta->nsecs;
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stats->max_num=pinfo->fd->num;
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}
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stats->tot.secs += delta->secs;
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stats->tot.nsecs += delta->nsecs;
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if(stats->tot.nsecs>1000000000){
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stats->tot.nsecs-=1000000000;
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stats->tot.secs++;
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}
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stats->num++;
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}
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/*
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* get_average - function
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*
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* function to calculate the average
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* returns the average as a gdouble , time base is milli seconds
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*/
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gdouble get_average(nstime_t *sum, guint32 num)
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{
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gdouble average;
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if(num > 0) {
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average = (double)sum->secs*1000 + (double)sum->nsecs/1000000;
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average /= num;
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}
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else {
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average = 0;
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}
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return average;
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}
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