Documentation/userspace-api/media/dvb/fe-get-frontend.rst

File Facts

System

Linux kernel

Corpus path

Documentation/userspace-api/media/dvb/fe-get-frontend.rst

Extension

.rst

Size

1009 bytes

Lines

59

Domain

Support Tooling And Documentation

Bucket

Documentation

Inferred role

Support Tooling And Documentation: documentation

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

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

.. _FE_GET_FRONTEND:

***************
FE_GET_FRONTEND
***************

Name
====

FE_GET_FRONTEND

.. attention:: This ioctl is deprecated.

Synopsis
========

.. c:macro:: FE_GET_FRONTEND

``int ioctl(int fd, FE_GET_FRONTEND, struct dvb_frontend_parameters *p)``

Arguments
=========

``fd``
    File descriptor returned by :c:func:`open()`.

``p``
    Points to parameters for tuning operation.

Description
===========

This ioctl call queries the currently effective frontend parameters. 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.

.. flat-table::
    :header-rows:  0
    :stub-columns: 0

    -  .. row 1

       -  ``EINVAL``

       -  Maximum supported symbol rate reached.

Generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.

Annotation

• Atlas domain: Support Tooling And Documentation / Documentation.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.