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1.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later2.. c:namespace:: RC3 4.. _lirc_set_transmitter_mask:5 6*******************************7ioctl LIRC_SET_TRANSMITTER_MASK8*******************************9 10Name11====12 13LIRC_SET_TRANSMITTER_MASK - Enables send codes on a given set of transmitters14 15Synopsis16========17 18.. c:macro:: LIRC_SET_TRANSMITTER_MASK19 20``int ioctl(int fd, LIRC_SET_TRANSMITTER_MASK, __u32 *mask)``21 22Arguments23=========24 25``fd``26 File descriptor returned by open().27 28``mask``29 Mask with channels to enable tx. Channel 0 is the least significant bit.30 31Description32===========33 34Some IR TX devices have multiple output channels, in such case,35:ref:`LIRC_CAN_SET_TRANSMITTER_MASK <LIRC-CAN-SET-TRANSMITTER-MASK>` is36returned via :ref:`LIRC_GET_FEATURES` and this ioctl sets what channels will37send IR codes.38 39This ioctl enables the given set of transmitters. The first transmitter is40encoded by the least significant bit and so on.41 42When an invalid bit mask is given, i.e. a bit is set, even though the device43does not have so many transitters, then this ioctl returns the number of44available transitters and does nothing otherwise.45 46Return Value47============48 49On success 0 is returned, on error -1 and the ``errno`` variable is set50appropriately. The generic error codes are described at the51:ref:`Generic Error Codes <gen-errors>` chapter.52