Remove superfluous process_exit () in start_process

src/userprog/process.c

@@ -155,7 +155,6 @@ start_process (void *proc_start_data)
   /* If stack initialization failed, free process resources and quit. */
   if (!success)
     {
-      process_exit ();
       thread_exit ();
     }
 
@@ -297,7 +296,10 @@ process_wait (tid_t child_tid UNUSED)
         break;
     }
   if (child_result == NULL)
-    return -1;
+    {
+      printf ("-1 due to: child_result == NULL\n");
+      return -1;
+    }
   /* Wait for child to die. */
   sema_down (&child_result->sema);
   /* We need lock release in process_exit, so we need to acquire (and possibly
@@ -311,6 +313,12 @@ process_wait (tid_t child_tid UNUSED)
   int exit_status = child_result->exit_status;
   lock_release (&child_result->lock);
   free (child_result);
+
+  if (exit_status == -1)
+    {
+      printf ("-1 due to: child exit status wrong!\n");
+    }
+
   return exit_status;
 }
 
@@ -318,6 +326,9 @@ process_wait (tid_t child_tid UNUSED)
 void
 process_exit (void)
 {
+
+  printf("(%s) EXIT STATUS: %d\n", thread_name (), thread_current ()->exit_status);
+
   struct thread *cur = thread_current ();
   uint32_t *pd;