mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 18:05:25 +07:00
60c2820d0f
The name of the subsystem is "media", and not "linux_tv". Also, as we plan to add other stuff there in the future, let's rename also the media uAPI book to media_uapi, to make it clearer. No functional changes. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
59 lines
1.1 KiB
ReStructuredText
59 lines
1.1 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
|
|
|
|
.. _func-munmap:
|
|
|
|
*************
|
|
V4L2 munmap()
|
|
*************
|
|
|
|
Name
|
|
====
|
|
|
|
v4l2-munmap - Unmap device memory
|
|
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. code-block:: c
|
|
|
|
#include <unistd.h>
|
|
#include <sys/mman.h>
|
|
|
|
|
|
.. cpp:function:: int munmap( void *start, size_t length )
|
|
|
|
|
|
Arguments
|
|
=========
|
|
|
|
``start``
|
|
Address of the mapped buffer as returned by the
|
|
:ref:`mmap() <func-mmap>` function.
|
|
|
|
``length``
|
|
Length of the mapped buffer. This must be the same value as given to
|
|
:ref:`mmap() <func-mmap>` and returned by the driver in the struct
|
|
:ref:`v4l2_buffer <v4l2-buffer>` ``length`` field for the
|
|
single-planar API and in the struct
|
|
:ref:`v4l2_plane <v4l2-plane>` ``length`` field for the
|
|
multi-planar API.
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
Unmaps a previously with the :ref:`mmap() <func-mmap>` function mapped
|
|
buffer and frees it, if possible.
|
|
|
|
|
|
Return Value
|
|
============
|
|
|
|
On success :ref:`munmap() <func-munmap>` returns 0, on failure -1 and the
|
|
``errno`` variable is set appropriately:
|
|
|
|
EINVAL
|
|
The ``start`` or ``length`` is incorrect, or no buffers have been
|
|
mapped yet.
|