1 files changed, 95 insertions, 0 deletions
diff --git a/regress/sys/kern/itimer/itimer.c b/regress/sys/kern/itimer/itimer.c
new file mode 100644
index 00000000000..cdaf2849e40
--- /dev/null
+++ b/regress/sys/kern/itimer/itimer.c
@@ -0,0 +1,95 @@
+/*	$OpenBSD: itimer.c,v 1.1 2004/07/28 21:32:51 art Exp $	*/
+/*
+ *	Written by Artur Grabowski <art@openbsd.org> 2004 Public Domain.
+ */
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <time.h>
+#include <err.h>
+#include <signal.h>
+
+void sighand(int);
+
+volatile sig_atomic_t ticks;
+
+#define TIMEOUT	2
+
+int
+main(int argc, char **argv)
+{
+	struct timeval stv, tv;
+	struct itimerval itv;
+	struct rusage ru;
+	int which, sig;
+	int ch;
+
+	while ((ch = getopt(argc, argv, "rvp")) != -1) {
+		switch (ch) {
+		case 'r':
+			which = ITIMER_REAL;
+			sig = SIGALRM;
+			break;
+		case 'v':
+			which = ITIMER_VIRTUAL;
+			sig = SIGVTALRM;
+			break;
+		case 'p':
+			which = ITIMER_PROF;
+			sig = SIGPROF;
+			break;
+		default:
+			fprintf(stderr, "Usage: itimer [-rvp]\n");
+			exit(1);
+		}
+	}
+
+	signal(sig, sighand);
+
+	itv.it_value.tv_sec = 0;
+	itv.it_value.tv_usec = 100000;
+	itv.it_interval = itv.it_value;
+
+	if (setitimer(which, &itv, NULL) != 0)
+		err(1, "setitimer");
+
+	gettimeofday(&stv, NULL);
+	while (ticks != TIMEOUT * 10)
+		;
+
+	switch (which) {
+	case ITIMER_REAL:
+		gettimeofday(&tv, NULL);
+		timersub(&tv, &stv, &tv);
+		break;
+	case ITIMER_VIRTUAL:
+	case ITIMER_PROF:
+		if (getrusage(RUSAGE_SELF, &ru) != 0)
+			err(1, "getrusage");
+		tv = ru.ru_utime;
+		break;
+	}
+	stv.tv_sec = TIMEOUT;
+	stv.tv_usec = 0;
+
+	if (timercmp(&stv, &tv, <))
+		timersub(&tv, &stv, &tv);
+	else
+		timersub(&stv, &tv, &tv);
+
+	if (tv.tv_sec != 0 || tv.tv_usec > 100000)
+		errx(1, "timer difference too big: %ld.%ld", (long)tv.tv_sec,
+		    (long)tv.tv_usec);
+
+	return (0);
+}
+
+void
+sighand(int signum)
+{
+	ticks++;
+}