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

Source file repositories/reference/linux-study-clean/Documentation/userspace-api/media/dvb/fe-set-frontend.rst

File Facts

System: Linux kernel
Corpus path: Documentation/userspace-api/media/dvb/fe-set-frontend.rst
Extension: .rst
Size: 1483 bytes
Lines: 69
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_SET_FRONTEND:

***************
FE_SET_FRONTEND
***************

.. attention:: This ioctl is deprecated.

Name
====

FE_SET_FRONTEND

Synopsis
========

.. c:macro:: FE_SET_FRONTEND

``int ioctl(int fd, FE_SET_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 starts a tuning operation using specified parameters.
The result of this call will be successful if the parameters were valid
and the tuning could be initiated. The result of the tuning operation in
itself, however, will arrive asynchronously as an event (see
documentation for :ref:`FE_GET_EVENT` and
FrontendEvent.) If a new :ref:`FE_SET_FRONTEND`
operation is initiated before the previous one was completed, the
previous operation will be aborted in favor of the new one. This command
requires read/write access to the device.

Return Value
============

On success 0 is returned.

On error -1 is returned, and the ``errno`` variable is set
appropriately.

.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|

.. flat-table::
    :header-rows:  0
    :stub-columns: 0
    :widths: 1 16

    -  .. 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.