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.. -*- coding: utf-8; mode: rst -*-
.. _FE_READ_SNR:
***********
FE_READ_SNR
***********
Name
====
FE_READ_SNR
Synopsis
========
.. cpp: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.
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