1 files changed, 18 insertions, 0 deletions
diff --git a/src/tests/userprog/close-twice.c b/src/tests/userprog/close-twice.c
new file mode 100644
index 0000000..830bccf
--- /dev/null
+++ b/src/tests/userprog/close-twice.c
@@ -0,0 +1,18 @@
+/* Opens a file and then tries to close it twice.  The second
+   close must either fail silently or terminate with exit code
+   -1. */
+
+#include <syscall.h>
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void) 
+{
+  int handle;
+  CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");
+  msg ("close \"sample.txt\"");
+  close (handle);
+  msg ("close \"sample.txt\" again");
+  close (handle);
+}