--- utils.h.orig	Wed Aug 22 21:38:00 2001
+++ utils.h	Wed Aug 22 21:44:59 2001
@@ -120,8 +120,8 @@
 #define TIMEVAL_SUBTRACT(a,b) (((a).tv_sec - (b).tv_sec) * 1000000 + (a).tv_usec - (b).tv_usec)
 /* Timeval subtract in milliseconds */
 #define TIMEVAL_MSEC_SUBTRACT(a,b) ((((a).tv_sec - (b).tv_sec) * 1000) + ((a).tv_usec - (b).tv_usec) / 1000)
-/* Timeval subtract in seconds */
-#define TIMEVAL_SEC_SUBTRACT(a,b) ((a).tv_sec - (b).tv_sec + ((a).tv_usec - (b).tv_usec + 500)/1000)
+/* Timeval subtract in seconds; truncate towards zero */
+#define TIMEVAL_SEC_SUBTRACT(a,b) ((a).tv_sec - (b).tv_sec + (((a).tv_usec < (b).tv_usec) ? - 1 : 0))
 
 /* assign one timeval to another timeval plus some msecs: a = b + msecs */
 #define TIMEVAL_MSEC_ADD(a, b, msecs) (a).tv_sec = (b).tv_sec + ((msecs) / 1000); (a).tv_usec = (b).tv_usec + ((msecs) % 1000) * 1000; (a).tv_sec += (a).tv_usec / 1000000; (a).tv_usec %= 1000000