Testing timeval equality deserves to be its own routine.

src/iperf_api.c

@@ -1449,8 +1449,7 @@ print_interval_results(struct iperf_test * test, struct iperf_stream * sp)
 	** else if there's more than one stream, print the separator;
 	** else nothing.
 	*/
-	if (sp->result->start_time.tv_sec == ir->interval_start_time.tv_sec &&
-	    sp->result->start_time.tv_usec == ir->interval_start_time.tv_usec)
+	if (timeval_equals(&sp->result->start_time, &ir->interval_start_time))
 	    printf(report_bw_header);
 	else if (test->num_streams > 1)
 	    printf(report_bw_separator);

src/timer.c

@@ -30,6 +30,15 @@ timeval_to_double(struct timeval * tv)
     return d;
 }
 
+int
+timeval_equals(struct timeval * tv0, struct timeval * tv1)
+{
+    if ( tv0->tv_sec == tv1->tv_sec && tv0->tv_usec == tv1->tv_usec )
+	return 1;
+    else
+	return 0;
+}
+
 double
 timeval_diff(struct timeval * tv0, struct timeval * tv1)
 {

src/timer.h

@@ -25,6 +25,8 @@ int delay(int64_t ns);
 
 double timeval_to_double(struct timeval *tv);
 
+int timeval_equals(struct timeval *tv0, struct timeval *tv1);
+
 double timeval_diff(struct timeval *tv0, struct timeval *tv1);
 
 int update_timer(struct timer *tp, time_t sec, suseconds_t usec);