--- /dev/null
+#include <syscall.h>
+#include "tests/vm/sample.inc"
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void)
+{
+ char *start = (char *) 0x10000000;
+ int fd[2];
+
+ CHECK ((fd[0] = open ("zeros")) > 1, "open \"zeros\" once");
+ CHECK (mmap (fd[0], start) != MAP_FAILED, "mmap \"zeros\"");
+ CHECK ((fd[1] = open ("zeros")) > 1 && fd[0] != fd[1],
+ "open \"zeros\" again");
+ CHECK (mmap (fd[1], start + 4096) == MAP_FAILED,
+ "try to mmap \"zeros\" again");
+}