1 files changed, 55 insertions, 0 deletions
diff --git a/src/tests/userprog/child-rox.c b/src/tests/userprog/child-rox.c
new file mode 100644
index 0000000..aba808b
--- /dev/null
+++ b/src/tests/userprog/child-rox.c
@@ -0,0 +1,55 @@
+/* Child process run by rox-child and rox-multichild tests.
+   Opens and tries to write to its own executable, verifying that
+   that is disallowed.
+   Then recursively executes itself to the depth indicated by the
+   first command-line argument. */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <syscall.h>
+#include "tests/lib.h"
+
+const char *test_name = "child-rox";
+
+static void
+try_write (void) 
+{
+  int handle;
+  char buffer[19];
+
+  quiet = true;
+  CHECK ((handle = open ("child-rox")) > 1, "open \"child-rox\"");
+  quiet = false;
+
+  CHECK (write (handle, buffer, sizeof buffer) == 0,
+         "try to write \"child-rox\"");
+  
+  close (handle);
+}
+
+int
+main (int argc UNUSED, char *argv[]) 
+{
+  msg ("begin");
+  try_write ();
+
+  if (!isdigit (*argv[1]))
+    fail ("bad command-line arguments");
+  if (atoi (argv[1]) > 1) 
+    {
+      char cmd[128];
+      int child;
+      
+      snprintf (cmd, sizeof cmd, "child-rox %d", atoi (argv[1]) - 1);
+      CHECK ((child = exec (cmd)) != -1, "exec \"%s\"", cmd);
+      quiet = true;
+      CHECK (wait (child) == 12, "wait for \"child-rox\"");
+      quiet = false;
+    }
+
+  try_write ();
+  msg ("end");
+
+  return 12;
+}