Add a simple program which calls sigtimedwait(2) to generate events for testing

This test timeout on a quiet system because there is nobody triggers
'syscall::*wait*:entry' probe while test execution.

Reviewed by:	gnn, markj, ngie
Differential Revision:	https://reviews.freebsd.org/D11668

cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/probes/tst.probestar.c

@@ -0,0 +1,47 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2017 Li-Wen Hsu <lwhsu@FreeBSD.org>
+ */
+
+#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int
+main(void)
+{
+
+    sigset_t set;
+    siginfo_t info;
+    struct timespec timeout;
+
+    (void)sigemptyset(&set);
+    (void)sigaddset(&set, SIGHUP);
+    timeout.tv_sec = 1;
+    timeout.tv_nsec = 0;
+
+    for (;;)
+        (void)sigtimedwait(&set, &info, &timeout);
+
+    return (0);
+}

cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/probes/tst.probestar.d

@@ -45,6 +45,7 @@ BEGIN
 }
 
 syscall::*wait*:entry
+/pid == $1/
 {
 	exit(0);
 }

cddl/usr.sbin/dtrace/tests/common/probes/Makefile

@@ -32,6 +32,7 @@ TESTEXES= \
 
 
 CFILES= \
+     tst.probestar.c  \