/* graph RTT samples in milliseconds */
static void
graph_rtt_sample (tcptrace_context_t *context,
tcb * ptcb,
segment * pseg,
unsigned long etime_rtt)
{
char title[210];
tcptrace_runtime_options_t *options = context->options;
/* if the FILE is NULL, open file */
if (ptcb->rtt_plotter == NO_PLOTTER) {
char *name_from, *name_to;
if (ptcb == &ptcb->ptp->a2b) {
name_from = ptcb->ptp->a_endpoint;
name_to = ptcb->ptp->b_endpoint;
} else {
name_from = ptcb->ptp->b_endpoint;
name_to = ptcb->ptp->a_endpoint;
}
snprintf (title, sizeof (title), "%s_==>_%s (rtt samples)",
name_from, name_to);
ptcb->rtt_plotter =
new_plotter(context, ptcb, NULL, title, "time", "rtt (ms)",
RTT_GRAPH_FILE_EXTENSION);
plotter_perm_color (ptcb->rtt_plotter, "red");
if (options->graph_time_zero) {
/* set graph zero points */
plotter_nothing (ptcb->rtt_plotter, context->current_time);
}
ptcb->rtt_line = new_line (ptcb->rtt_plotter, "rtt", "red");
}
if (etime_rtt <= 1)
return;
extend_line(ptcb->rtt_line, context->current_time, (int) (etime_rtt / 1000));
}
void
extend_line(
PLINE pline,
timeval xval,
int yval)
{
PLOTTER p;
if (!pline)
return;
p = pline->plotter;
#ifdef OLD
/* attach a label to the first non-zero point */
if (!pline->labelled) {
if (yval != 0) {
plotter_temp_color(p, pline->color);
plotter_text(p, xval, yval, "l", pline->label);
pline->labelled = 1;
}
}
#endif
/* attach a label midway on the first line segment above 0 */
/* for whom the second point is NOT 0 */
if (!pline->labelled) {
if ((yval != 0) && (!ZERO_TIME(&pline->last_time))) {
timeval tv_elapsed;
timeval tv_avg;
int avg_yval;
/* computer elapsed time for these 2 points */
tv_elapsed = xval;
tv_sub(&tv_elapsed,pline->last_time);
/* divide elapsed time by 2 */
tv_elapsed.tv_sec /= 2;
tv_elapsed.tv_usec /= 2;
/* add 1/2 of the elapsed time to the oldest point */
/* (giving us the average time) */
tv_avg = pline->last_time;
tv_add(&tv_avg, tv_elapsed);
/* average the Y values */
avg_yval = (1 + pline->last_y+yval)/2;
/* (rounding UP, please) */
/* draw the label */
plotter_temp_color(p, pline->color);
plotter_text(p, tv_avg, avg_yval, "l", pline->label);
/* remember that it's been done */
pline->labelled = 1;
}
}
/* draw a dot at the current point */
plotter_perm_color(p, pline->color);
plotter_dot(p, xval, yval);
/* if this isn't the FIRST point, connect with a line */
if (!ZERO_TIME(&pline->last_time)) {
plotter_line(p,
xval, yval,
pline->last_time, pline->last_y);
}
/* remember this point for the next line segment */
pline->last_time = xval;
pline->last_y = yval;
}
