int comedi_range_is_chan_specific(comedi_t *it,unsigned int subdevice);
int comedi_maxdata_is_chan_specific(comedi_t *it,unsigned int subdevice);
+int comedi_get_buffer_size(comedi_t *it,unsigned int subdevice);
+int comedi_get_max_buffer_size(comedi_t *it,unsigned int subdevice);
+int comedi_set_buffer_size(comedi_t *it,unsigned int subdevice,int len);
+
/* triggers and commands */
int comedi_cancel(comedi_t *it,unsigned int subdevice);