attempt to handle division by zero

diff --git a/netdata.c b/netdata.c
index e3c638ece5349a5372b3199e3f64616b0c443c38..c578b49d6a2a8822b92053acdd01cfa112056c04 100644 (file)
--- a/netdata.c
+++ b/netdata.c
@@ -1122,6 +1122,7 @@ RRD_DIMENSION *rrd_stats_dimension_add(RRD_STATS *st, const char *id, const char
 
        snprintf(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
        rd->divisor = config_get_number(st->id, varname, divisor);
+       if(!rd->divisor) rd->divisor = 1;
 
        rd->entries = st->entries;
        
@@ -1328,6 +1329,7 @@ unsigned long long rrd_stats_done(RRD_STATS *st)
        if(st->counter) {
                
                st->usec_since_last_update = usecdiff(&now, &st->last_updated);
+               if(!st->usec_since_last_update) st->usec_since_last_update = 1;
                if(st->debug) debug(D_RRD_STATS, "microseconds since last update: %llu", st->usec_since_last_update);
 
                // x 10
@@ -1340,7 +1342,8 @@ unsigned long long rrd_stats_done(RRD_STATS *st)
                                case RRD_DIMENSION_PCENT_OVER_DIFF_TOTAL:
                                        // the percentage of the current increment
                                        // over the increment of all dimensions together
-                                       rd->calculated_value =
+                                       if(st->absolute_total == st->last_absolute_total) rd->calculated_value = 0;
+                                       else rd->calculated_value =
                                                  (calculated_number)10
                                                * (calculated_number)100
                                                * (calculated_number)(rd->collected_value - rd->last_collected_value)
@@ -1359,6 +1362,8 @@ unsigned long long rrd_stats_done(RRD_STATS *st)
                                        break;
 
                                case RRD_DIMENSION_PCENT_OVER_ROW_TOTAL:
+                                       if(!st->absolute_total) rd->calculated_value = 0;
+                                       else
                                        // the percentage of the current value
                                        // over the total of all dimensions
                                        rd->calculated_value =