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1.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later2.. c:namespace:: RC3 4.. _lirc_get_rec_resolution:5 6*****************************7ioctl LIRC_GET_REC_RESOLUTION8*****************************9 10Name11====12 13LIRC_GET_REC_RESOLUTION - Obtain the value of receive resolution, in microseconds.14 15Synopsis16========17 18.. c:macro:: LIRC_GET_REC_RESOLUTION19 20``int ioctl(int fd, LIRC_GET_REC_RESOLUTION, __u32 *microseconds)``21 22Arguments23=========24 25``fd``26 File descriptor returned by open().27 28``microseconds``29 Resolution, in microseconds.30 31Description32===========33 34Some receivers have maximum resolution which is defined by internal35sample rate or data format limitations. E.g. it's common that36signals can only be reported in 50 microsecond steps.37 38This ioctl returns the integer value with such resolution, with can be39used by userspace applications like lircd to automatically adjust the40tolerance value.41 42Return Value43============44 45On success 0 is returned, on error -1 and the ``errno`` variable is set46appropriately. The generic error codes are described at the47:ref:`Generic Error Codes <gen-errors>` chapter.48