svn commit: r333251 - head/usr.bin/time

[Alan Somers]

Author: asomers
Date: Fri May  4 14:39:32 2018
New Revision: 333251
URL: https://svnweb.freebsd.org/changeset/base/333251

Log:
  time(1): use the monotonic clock
  
  The monotonic clock is more appropriate than the realtime clock for
  measuring durations.
  
  Reviewed by:	ken, jilles
  Differential Revision:	https://reviews.freebsd.org/D14032

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

Modified: head/usr.bin/time/time.c
==============================================================================
--- head/usr.bin/time/time.c	Fri May  4 14:38:48 2018	(r333250)
+++ head/usr.bin/time/time.c	Fri May  4 14:39:32 2018	(r333251)
@@ -121,7 +121,7 @@ main(int argc, char **argv)
 		setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
 	}
 
-	if (clock_gettime(CLOCK_REALTIME, &before_ts))
+	if (clock_gettime(CLOCK_MONOTONIC, &before_ts))
 		err(1, "clock_gettime");
 	switch(pid = fork()) {
 	case -1:			/* error */
@@ -141,13 +141,13 @@ main(int argc, char **argv)
 	while (wait4(pid, &status, 0, &ru) != pid) {
 		if (siginfo_recvd) {
 			siginfo_recvd = 0;
-			if (clock_gettime(CLOCK_REALTIME, &after))
+			if (clock_gettime(CLOCK_MONOTONIC, &after))
 				err(1, "clock_gettime");
 			getrusage(RUSAGE_CHILDREN, &ru);
 			showtime(stdout, &before_ts, &after, &ru);
 		}
 	}
-	if (clock_gettime(CLOCK_REALTIME, &after))
+	if (clock_gettime(CLOCK_MONOTONIC, &after))
 		err(1, "clock_gettime");
 	if ( ! WIFEXITED(status))
 		warnx("command terminated abnormally");