sd_device_enumerator *sd_device_enumerator_ref(sd_device_enumerator *enumerator);
sd_device_enumerator *sd_device_enumerator_unref(sd_device_enumerator *enumerator);
-int sd_device_enumerator_add_device(sd_device_enumerator *enumerator, sd_device *device);
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sd_device *sd_device_enumerator_get_device_first(sd_device_enumerator *enumerator);
sd_device *sd_device_enumerator_get_device_next(sd_device_enumerator *enumerator);
sd_device *sd_device_enumerator_get_subsystem_first(sd_device_enumerator *enumerator);