.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later .. c:namespace:: RC .. _lirc_set_send_duty_cycle: ****************************** ioctl LIRC_SET_SEND_DUTY_CYCLE ****************************** Name ==== LIRC_SET_SEND_DUTY_CYCLE - Set the duty cycle of the carrier signal for IR transmit. Synopsis ======== .. c:macro:: LIRC_SET_SEND_DUTY_CYCLE ``int ioctl(int fd, LIRC_SET_SEND_DUTY_CYCLE, __u32 *duty_cycle)`` Arguments ========= ``fd`` File descriptor returned by open(). ``duty_cycle`` Duty cicle, describing the pulse width in percent (from 1 to 99) of the total cycle. Values 0 and 100 are reserved. Description =========== Get/set the duty cycle of the carrier signal for IR transmit. Currently, no special meaning is defined for 0 or 100, but this could be used to switch off carrier generation in the future, so these values should be reserved. Return Value ============ On success 0 is returned, on error -1 and the ``errno`` variable is set appropriately. The generic error codes are described at the :ref:`Generic Error Codes ` chapter.