Documentation/userspace-api/gpio/gpio-get-lineinfo-unwatch-ioctl.rst
Source file repositories/reference/linux-study-clean/Documentation/userspace-api/gpio/gpio-get-lineinfo-unwatch-ioctl.rst
File Facts
- System
- Linux kernel
- Corpus path
Documentation/userspace-api/gpio/gpio-get-lineinfo-unwatch-ioctl.rst- Extension
.rst- Size
- 1066 bytes
- Lines
- 50
- 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.
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: GPL-2.0
.. _GPIO_GET_LINEINFO_UNWATCH_IOCTL:
*******************************
GPIO_GET_LINEINFO_UNWATCH_IOCTL
*******************************
Name
====
GPIO_GET_LINEINFO_UNWATCH_IOCTL - Disable watching a line for changes to its
requested state and configuration information.
Synopsis
========
.. c:macro:: GPIO_GET_LINEINFO_UNWATCH_IOCTL
``int ioctl(int chip_fd, GPIO_GET_LINEINFO_UNWATCH_IOCTL, u32 *offset)``
Arguments
=========
``chip_fd``
The file descriptor of the GPIO character device returned by `open()`.
``offset``
The offset of the line to no longer watch.
Description
===========
Remove the line from the list of lines being watched on this ``chip_fd``.
This is the reverse of gpio-v2-get-lineinfo-watch-ioctl.rst (v2) and
gpio-get-lineinfo-watch-ioctl.rst (v1).
Unwatching a line that is not watched is an error (**EBUSY**).
First added in 5.7.
Return Value
============
On success 0.
On error -1 and the ``errno`` variable is set appropriately.
Common error codes are described in error-codes.rst.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.