.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later .. c:namespace:: DTV.fe

.. _FE_READ_SNR:

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FE_READ_SNR

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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.