1 files changed, 25 insertions, 0 deletions
diff --git a/src/tests/userprog/multi-child-fd.c b/src/tests/userprog/multi-child-fd.c
new file mode 100644
index 0000000..48de4b4
--- /dev/null
+++ b/src/tests/userprog/multi-child-fd.c
@@ -0,0 +1,25 @@
+/* Opens a file and then runs a subprocess that tries to close
+   the file.  (Pintos does not have inheritance of file handles,
+   so this must fail.)  The parent process then attempts to use
+   the file handle, which must succeed. */
+
+#include <stdio.h>
+#include <syscall.h>
+#include "tests/userprog/sample.inc"
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void) 
+{
+  char child_cmd[128];
+  int handle;
+
+  CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");
+
+  snprintf (child_cmd, sizeof child_cmd, "child-close %d", handle);
+  
+  msg ("wait(exec()) = %d", wait (exec (child_cmd)));
+
+  check_file_handle (handle, "sample.txt", sample, sizeof sample - 1);
+}