1b81f010bf
Now that we have an override for the c domain that will do the right thing for the Kernel, stop abusing on the cpp domain. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
62 lines
995 B
ReStructuredText
62 lines
995 B
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
|
|
|
|
.. _FE_READ_SNR:
|
|
|
|
***********
|
|
FE_READ_SNR
|
|
***********
|
|
|
|
Name
|
|
====
|
|
|
|
FE_READ_SNR
|
|
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. c:function:: int ioctl(int fd, int request = FE_READ_SNR, int16_t *snr)
|
|
|
|
|
|
Arguments
|
|
=========
|
|
|
|
.. flat-table::
|
|
:header-rows: 0
|
|
:stub-columns: 0
|
|
|
|
|
|
- .. row 1
|
|
|
|
- int fd
|
|
|
|
- File descriptor returned by a previous call to open().
|
|
|
|
- .. row 2
|
|
|
|
- int request
|
|
|
|
- Equals :ref:`FE_READ_SNR` for this command.
|
|
|
|
- .. row 3
|
|
|
|
- uint16_t \*snr
|
|
|
|
- The signal-to-noise ratio is stored into \*snr.
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
This ioctl call returns the signal-to-noise ratio for the signal
|
|
currently received by the front-end. For this command, read-only access
|
|
to the device is sufficient.
|
|
|
|
|
|
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.
|