New test: /dev/litmus/ctrl must be writable

Under any plugin, the control page should be mappable
and writable.

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/core_api.c b/tests/core_api.c
index 33c6217..533fb8e 100644
--- a/tests/core_api.c
+++ b/tests/core_api.c
@@ -141,3 +141,20 @@ TESTCASE(rt_fork_non_rt, LITMUS,
                 ASSERT(WEXITSTATUS(status) == 0);
         }
 }
+
+TESTCASE(ctrl_page_writable, ALL,
+         "tasks have write access to /dev/litmus/ctrl mappings")
+{
+        volatile int *ctrl_page = (volatile int*) get_ctrl_page();
+
+        /* init_litmus() should have mapped the page already  */
+        ASSERT(ctrl_page != NULL);
+
+        /* These should work without page faults. */
+        enter_np();
+        exit_np();
+
+        /* Try poking the memory directly. */
+
+        ctrl_page[32] = 0x12345678;
+}