Check for monotonic user and system time.

2 files changed, 46 insertions, 0 deletions

diff --git a/regress/sys/kern/getrusage/Makefile b/regress/sys/kern/getrusage/Makefile
new file mode 100644
index 00000000000..97cbab8a5e0
--- /dev/null
+++ b/regress/sys/kern/getrusage/Makefile
@@ -0,0 +1,11 @@
+#	$OpenBSD: Makefile,v 1.1 2001/12/17 01:22:05 nordin Exp $
+
+PROG=	getrusage
+NOMAN=	noman, no way, man
+
+install:
+
+regress:
+	./getrusage
+
+.include <bsd.prog.mk>
diff --git a/regress/sys/kern/getrusage/getrusage.c b/regress/sys/kern/getrusage/getrusage.c
new file mode 100644
index 00000000000..ffc4bad49b1
--- /dev/null
+++ b/regress/sys/kern/getrusage/getrusage.c
@@ -0,0 +1,35 @@
+#include <err.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/types.h>
+
+int
+main()
+{
+	struct timeval utime;
+	struct timeval stime;
+        struct rusage r;
+        int i;
+
+	timerclear(&utime);
+	timerclear(&stime);
+	do {
+		if (getrusage(RUSAGE_SELF, &r) == -1)
+			err(1, "getrusage");
+
+		if (timercmp(&(r.ru_utime), &utime, <))
+			errx(1, "user time decreased");
+		utime = r.ru_utime;
+
+		if (timercmp(&(r.ru_stime), &stime, <))
+			errx(1, "system time decreased");
+		stime = r.ru_stime;
+        } while (utime.tv_sec < 1 && stime.tv_sec < 1);
+
+        return 0;
+}