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.. -*- coding: utf-8; mode: rst -*-
.. _FE_READ_SNR:
***********
FE_READ_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.
SYNOPSIS
int ioctl(int fd, int request = :ref:`FE_READ_SNR <FE_READ_SNR>`,
uint16_t *snr);
PARAMETERS
.. 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 <FE_READ_SNR>` for this command.
- .. row 3
- uint16_t *snr
- The signal-to-noise ratio is stored into *snr.
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.
.. ------------------------------------------------------------------------------
.. This file was automatically converted from DocBook-XML with the dbxml
.. library (https://github.com/return42/sphkerneldoc). The origin XML comes
.. from the linux kernel, refer to:
..
.. * https://github.com/torvalds/linux/tree/master/Documentation/DocBook
.. ------------------------------------------------------------------------------
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