mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
852 B
49 lines
852 B
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
|
.. c:namespace:: DTV.fe |
|
|
|
.. _FE_READ_SNR: |
|
|
|
*********** |
|
FE_READ_SNR |
|
*********** |
|
|
|
Name |
|
==== |
|
|
|
FE_READ_SNR |
|
|
|
.. attention:: This ioctl is deprecated. |
|
|
|
Synopsis |
|
======== |
|
|
|
.. c:macro:: FE_READ_SNR |
|
|
|
``int ioctl(int fd, FE_READ_SNR, int16_t *snr)`` |
|
|
|
Arguments |
|
========= |
|
|
|
``fd`` |
|
File descriptor returned by :c:func:`open()`. |
|
|
|
``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 is returned, and the ``errno`` variable is set |
|
appropriately. |
|
|
|
Generic error codes are described at the |
|
:ref:`Generic Error Codes <gen-errors>` chapter.
|
|
|