diff --git a/tests/common/open_RDWR_failure.c b/tests/common/open_RDWR_failure.c
new file mode 100644
index 00000000..b2ff8eb2
--- /dev/null
+++ b/tests/common/open_RDWR_failure.c
@@ -0,0 +1,51 @@
+/* 
+ * gcc open_RDWR_failure.c -o open_RDWR_failure.so -shared -ldl 
+ * LD_PRELOAD=./open_RDWR_failure.so FAILURE_PATH=/etc/shadow ./test /etc/shadow
+ */
+
+#define _GNU_SOURCE
+#include <dlfcn.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+typedef int (*open_type) (const char *pathname, int flag, ...);
+static open_type next_open;
+
+static const char *failure_path = NULL;
+
+int open64 (const char *pathname, int flag, ...)
+{
+	if (NULL == next_open)
+	{
+		next_open = dlsym (RTLD_NEXT, "open64");
+		assert (NULL != next_open);
+	}
+	if (NULL == failure_path) {
+		failure_path = getenv ("FAILURE_PATH");
+		if (NULL == failure_path) {
+			fputs ("No FAILURE_PATH defined\n", stderr);
+		}
+	}
+
+	if (   (NULL != pathname)
+	    && (flag & O_RDWR)
+	    && (NULL != failure_path)
+	    && (strcmp (pathname, failure_path) == 0))
+	{
+		fprintf (stderr, "open FAILURE %s %x ...\n", pathname, flag);
+		errno = EIO;
+		return -1;
+	}
+
+	return next_open (pathname, flag);
+}
+
diff --git a/tests/common/time_0.c b/tests/common/time_0.c
new file mode 100644
index 00000000..6937361e
--- /dev/null
+++ b/tests/common/time_0.c
@@ -0,0 +1,16 @@
+/* 
+ * gcc time_0.c -o time_0.so -shared
+ * LD_PRELOAD=./time_0.so ./test
+ */
+
+#include <stdio.h>
+#include <time.h>
+
+
+time_t time (time_t *t)
+{
+	fprintf (stderr, "time 0\n");
+
+	return (time_t)0;
+}
+