1 files changed, 19 insertions, 0 deletions
diff --git a/src/tests/userprog/open-twice.c b/src/tests/userprog/open-twice.c
new file mode 100644
index 0000000..dd333af
--- /dev/null
+++ b/src/tests/userprog/open-twice.c
@@ -0,0 +1,19 @@
+/* Tries to open the same file twice,
+   which must succeed and must return a different file descriptor
+   in each case. */
+
+#include <syscall.h>
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void) 
+{
+  int h1 = open ("sample.txt");
+  int h2 = open ("sample.txt");  
+
+  CHECK ((h1 = open ("sample.txt")) > 1, "open \"sample.txt\" once");
+  CHECK ((h2 = open ("sample.txt")) > 1, "open \"sample.txt\" again");
+  if (h1 == h2)
+    fail ("open() returned %d both times", h1);
+}