selftests/user_events: Add test cases when event is disabled

When user_events are disabled, it's write operation should return -EBADF.
Add this test cases.

Link: https://lkml.kernel.org/r/20230626111344.19136-4-sunliming@kylinos.cn
Acked-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: sunliming <sunliming@kylinos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/tools/testing/selftests/user_events/ftrace_test.c b/tools/testing/selftests/user_events/ftrace_test.c
index 8889874..5beb0ae 100644 (file)
--- a/tools/testing/selftests/user_events/ftrace_test.c
+++ b/tools/testing/selftests/user_events/ftrace_test.c
@@ -324,6 +324,10 @@ TEST_F(user, write_events) {
        io[0].iov_base = &reg.write_index;
        io[0].iov_len = sizeof(reg.write_index);
 
+       /* Write should return -EBADF when event is not enabled */
+       ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+       ASSERT_EQ(EBADF, errno);
+
        /* Enable event */
        self->enable_fd = open(enable_file, O_RDWR);
        ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))