@brief Reserve a set of GPIO lines, set the direction to output.
@param bulk Set of GPIO lines to reserve.
@param consumer Name of the consumer.
@param flags Additional request flags.
@param default_vals Initial line values.
@return 0 if the lines were properly reserved, -1 on failure.
@brief Reserve a set of GPIO lines, set the direction to output. @param bulk Set of GPIO lines to reserve. @param consumer Name of the consumer. @param flags Additional request flags. @param default_vals Initial line values. @return 0 if the lines were properly reserved, -1 on failure.