summaryrefslogtreecommitdiffstats
path: root/Documentation/media/uapi/rc/lirc-get-length.rst
blob: 8c2747c8d2c9e2cab495e47acd87b19d86984a1f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
.. -*- coding: utf-8; mode: rst -*-

.. _lirc_get_length:

*********************
ioctl LIRC_GET_LENGTH
*********************

Name
====

LIRC_GET_LENGTH - Retrieves the code length in bits.

Synopsis
========

.. c:function:: int ioctl( int fd, LIRC_GET_LENGTH, __u32 *length )
    :name: LIRC_GET_LENGTH

Arguments
=========

``fd``
    File descriptor returned by open().

``length``
    length, in bits


Description
===========

Retrieves the code length in bits (only for ``LIRC-MODE-LIRCCODE``).
Reads on the device must be done in blocks matching the bit count.
The bit could should be rounded up so that it matches full bytes.


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 <gen-errors>` chapter.