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- .. 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.
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