Add a function to retrieve the udev_device handle from a libinput device

The libinput device abstracts a number of things but sometimes the underlying
device is important. The udev device provides the necessary handle to access
that underlying device and various sysfs properties that may be necessary.

A function returning the device node would've done the same thing but is more
prone to race conditions than the udev_device.

https://bugs.freedesktop.org/show_bug.cgi?id=85573

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/test/device.c b/test/device.c
index 6843824a..84984f4c 100644
--- a/test/device.c
+++ b/test/device.c
@@ -618,6 +618,17 @@ START_TEST(device_ids)
 }
 END_TEST
 
+START_TEST(device_get_udev_handle)
+{
+	struct litest_device *dev = litest_current_device();
+	struct udev_device *udev_device;
+
+	udev_device = libinput_device_get_udev_device(dev->libinput_device);
+	ck_assert_notnull(udev_device);
+	udev_device_unref(udev_device);
+}
+END_TEST
+
 int main (int argc, char **argv)
 {
 	litest_add("device:sendevents", device_sendevents_config, LITEST_ANY, LITEST_TOUCHPAD);
@@ -640,5 +651,7 @@ int main (int argc, char **argv)
 	litest_add("device:sendevents", device_disable_topsoftbutton, LITEST_TOPBUTTONPAD, LITEST_ANY);
 	litest_add("device:id", device_ids, LITEST_ANY, LITEST_ANY);
 
+	litest_add("device:udev", device_get_udev_handle, LITEST_ANY, LITEST_ANY);
+
 	return litest_run(argc, argv);
 }