svn commit: r249334 - head/usr.bin/ctlstat

[Kenneth D. Merry]

Author: ken
Date: Wed Apr 10 16:01:45 2013
New Revision: 249334
URL: http://svnweb.freebsd.org/changeset/base/249334

Log:
  Fix a time calculation error in ctlstat_standard().
  
  ctlstat.c:	When converting a timeval to a floating point
  		number in ctlstat_standard(), cast the nanoseconds
  		calculation to a long double, so we don't lose
  		precision.  Without the cast, we wind up with a
  		time in whole seconds only.
  
  Sponsored by:	Spectra Logic
  MFC after:	3 days

Modified:
  head/usr.bin/ctlstat/ctlstat.c

Modified: head/usr.bin/ctlstat/ctlstat.c
==============================================================================
--- head/usr.bin/ctlstat/ctlstat.c	Wed Apr 10 11:26:30 2013	(r249333)
+++ head/usr.bin/ctlstat/ctlstat.c	Wed Apr 10 16:01:45 2013	(r249334)
@@ -416,9 +416,10 @@ ctlstat_standard(struct ctlstat_context 
 	if (F_CPU(ctx) && (getcpu(&ctx->cur_cpu) != 0))
 		errx(1, "error returned from getcpu()");
 
-	cur_secs = ctx->cur_time.tv_sec + (ctx->cur_time.tv_nsec / 1000000000);
+	cur_secs = ctx->cur_time.tv_sec +
+		((long double)ctx->cur_time.tv_nsec / 1000000000);
 	prev_secs = ctx->prev_time.tv_sec +
-	     (ctx->prev_time.tv_nsec / 1000000000);
+	     ((long double)ctx->prev_time.tv_nsec / 1000000000);
 
 	etime = cur_secs - prev_secs;