[PATCH v2] selftests/input: introduce a test for the EVIOCGLED ioctl

[PATCH v2] selftests/input: introduce a test for the EVIOCGLED ioctl

[Dana Elfassy]

This patch introduces a specific test case for the EVIOCGLED ioctl.
The test covers the case where len > maxlen in the
EVIOCGLED(sizeof(all_leds)), all_leds) ioctl.

Signed-off-by: Dana Elfassy <dangel101@gmail.com>
---
Changes in v2:
- Changed variable leds from an array to an int

This patch depends on '[v3] selftests/input: Introduce basic tests for evdev ioctls' [1] sent to the ML.
[1] https://patchwork.kernel.org/project/linux-input/patch/20230607153214.15933-1-eballetbo@kernel.org/

 tools/testing/selftests/input/evioc-test.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/testing/selftests/input/evioc-test.c b/tools/testing/selftests/input/evioc-test.c
index ad7b93fe39cf..378db2b4dd56 100644
--- a/tools/testing/selftests/input/evioc-test.c
+++ b/tools/testing/selftests/input/evioc-test.c
@@ -234,4 +234,21 @@ TEST(eviocsrep_set_repeat_settings)
 	selftest_uinput_destroy(uidev);
 }
 
+TEST(eviocgled_get_all_leds)
+{
+	struct selftest_uinput *uidev;
+	int leds = 0;
+	int rc;
+
+	rc = selftest_uinput_create_device(&uidev, -1);
+	ASSERT_EQ(0, rc);
+	ASSERT_NE(NULL, uidev);
+
+	/* ioctl to set the maxlen = 0 */
+	rc = ioctl(uidev->evdev_fd, EVIOCGLED(0), leds);
+	ASSERT_EQ(0, rc);
+
+	selftest_uinput_destroy(uidev);
+}
+
 TEST_HARNESS_MAIN
-- 
2.41.0

Re: [PATCH v2] selftests/input: introduce a test for the EVIOCGLED ioctl

[Enric Balletbo Serra]

Hi Dana,

Thanks for taking my comments into consideration.

Missatge de Dana Elfassy <delfassy@redhat.com> del dia dj., 22 de juny
2023 a les 16:35:
>
> This patch introduces a specific test case for the EVIOCGLED ioctl.
> The test covers the case where len > maxlen in the
> EVIOCGLED(sizeof(all_leds)), all_leds) ioctl.
>

If I understand correctly this covers the same code path in the kernel
as the EVIOCGKEY test [1] that you sent before. The only difference is
that from the userspace point of view, the entry point is different,
here you use EVIOCGLED as a trigerr and before you used EVIOCGKEY. But
once in the kernel, the code path is the same. I am not sure if it
makes really sense to repeat this test, but it is up to maintainers to
decide. In any case, it looks good to me, so

> Signed-off-by: Dana Elfassy <dangel101@gmail.com>

Reviewed-by: Enric Balletbo i Serra <eballetbo@kernel.org>

[1] https://patchwork.kernel.org/project/linux-kselftest/patch/20230622141802.135723-1-dangel101@gmail.com/

> ---
> Changes in v2:
> - Changed variable leds from an array to an int
>
> This patch depends on '[v3] selftests/input: Introduce basic tests for evdev ioctls' [1] sent to the ML.
> [1] https://patchwork.kernel.org/project/linux-input/patch/20230607153214.15933-1-eballetbo@kernel.org/
>
>  tools/testing/selftests/input/evioc-test.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/tools/testing/selftests/input/evioc-test.c b/tools/testing/selftests/input/evioc-test.c
> index ad7b93fe39cf..378db2b4dd56 100644
> --- a/tools/testing/selftests/input/evioc-test.c
> +++ b/tools/testing/selftests/input/evioc-test.c
> @@ -234,4 +234,21 @@ TEST(eviocsrep_set_repeat_settings)
>         selftest_uinput_destroy(uidev);
>  }
>
> +TEST(eviocgled_get_all_leds)
> +{
> +       struct selftest_uinput *uidev;
> +       int leds = 0;
> +       int rc;
> +
> +       rc = selftest_uinput_create_device(&uidev, -1);
> +       ASSERT_EQ(0, rc);
> +       ASSERT_NE(NULL, uidev);
> +
> +       /* ioctl to set the maxlen = 0 */
> +       rc = ioctl(uidev->evdev_fd, EVIOCGLED(0), leds);
> +       ASSERT_EQ(0, rc);
> +
> +       selftest_uinput_destroy(uidev);
> +}
> +
>  TEST_HARNESS_MAIN
> --
> 2.41.0
>