+int manager_enumerate_buttons(Manager *m) {
+ struct udev_list_entry *item = NULL, *first = NULL;
+ struct udev_enumerate *e;
+ int r;
+
+ assert(m);
+
+ /* Loads buttons from udev */
+
+ if (m->handle_power_key == HANDLE_OFF &&
+ m->handle_sleep_key == HANDLE_OFF &&
+ m->handle_lid_switch == HANDLE_OFF)
+ return 0;
+
+ e = udev_enumerate_new(m->udev);
+ if (!e) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ r = udev_enumerate_add_match_subsystem(e, "input");
+ if (r < 0)
+ goto finish;
+
+ r = udev_enumerate_add_match_tag(e, "power-switch");
+ if (r < 0)
+ goto finish;
+
+ r = udev_enumerate_scan_devices(e);
+ if (r < 0)
+ goto finish;
+
+ first = udev_enumerate_get_list_entry(e);
+ udev_list_entry_foreach(item, first) {
+ struct udev_device *d;
+ int k;
+
+ d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
+ if (!d) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ k = manager_process_button_device(m, d);
+ udev_device_unref(d);
+
+ if (k < 0)
+ r = k;
+ }
+
+finish:
+ if (e)
+ udev_enumerate_unref(e);
+
+ return r;
+}
+