Documentation/userspace-api/media/dvb/fe-get-info.rst
Source file repositories/reference/linux-study-clean/Documentation/userspace-api/media/dvb/fe-get-info.rst
File Facts
- System
- Linux kernel
- Corpus path
Documentation/userspace-api/media/dvb/fe-get-info.rst- Extension
.rst- Size
- 1421 bytes
- Lines
- 60
- 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_INFO:
*****************
ioctl FE_GET_INFO
*****************
Name
====
FE_GET_INFO - Query Digital TV frontend capabilities and returns information
about the - front-end. This call only requires read-only access to the device.
Synopsis
========
.. c:macro:: FE_GET_INFO
``int ioctl(int fd, FE_GET_INFO, struct dvb_frontend_info *argp)``
Arguments
=========
``fd``
File descriptor returned by :c:func:`open()`.
``argp``
pointer to struct :c:type:`dvb_frontend_info`
Description
===========
All Digital TV frontend devices support the :ref:`FE_GET_INFO` ioctl. It is
used to identify kernel devices compatible with this specification and to
obtain information about driver and hardware capabilities. The ioctl
takes a pointer to dvb_frontend_info which is filled by the driver.
When the driver is not compatible with this specification the ioctl
returns an error.
frontend capabilities
=====================
Capabilities describe what a frontend can do. Some capabilities are
supported only on some specific frontend types.
The frontend capabilities are described at :c:type:`fe_caps`.
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.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.