Added the calculation of `mdev' to `oping'

diff --git a/src/oping.c b/src/oping.c
index cc115f2..485859d 100644 (file)
--- a/src/oping.c
+++ b/src/oping.c
@@ -67,6 +67,7 @@ typedef struct ping_context
        double latency_min;
        double latency_max;
        double latency_total;
+       double latency_total_square;
 } ping_context_t;
 
 static double opt_interval   = 1.0;
@@ -91,6 +92,7 @@ ping_context_t *context_create (void)
        ret->latency_min   = -1.0;
        ret->latency_max   = -1.0;
        ret->latency_total = 0.0;
+       ret->latency_total_square = 0.0;
 
        return (ret);
 }
@@ -173,6 +175,7 @@ void print_host (pingobj_iter_t *iter)
        {
                context->req_rcvd++;
                context->latency_total += latency;
+               context->latency_total_square += (latency * latency);
 
                if ((context->latency_max < 0.0) || (context->latency_max < latency))
                        context->latency_max = latency;
@@ -379,9 +382,15 @@ int main (int argc, char **argv)
                        iter = ping_iterator_next (iter))
        {
                ping_context_t *context;
+               double average;
+               double deviation;
 
                context = ping_iterator_get_context (iter);
 
+               average = context->latency_total / ((double) context->req_rcvd);
+               deviation = context->latency_total_square / ((double) context->req_rcvd);
+               deviation = sqrt (deviation - (average * average));
+
                printf ("\n--- %s ping statistics ---\n"
                                "%i packets transmitted, %i received, %.2f%% packet loss, time %.1fms\n"
                                "rtt min/avg/max/mdev = %.3f/%.3f/%.3f/%.3f ms\n",
@@ -389,9 +398,9 @@ int main (int argc, char **argv)
                                100.0 * (context->req_sent - context->req_rcvd) / ((double) context->req_sent),
                                context->latency_total,
                                context->latency_min,
-                               context->latency_total / ((double) context->req_rcvd),
+                               average,
                                context->latency_max,
-                               0.00);
+                               deviation);
 
                ping_iterator_set_context (iter, NULL);
                free (context);