1 .. SPDX-License-Identifier: GFDL-1.1-no-invari
2 .. c:namespace:: V4L
3
4 .. _func-munmap:
5
6 *************
7 V4L2 munmap()
8 *************
9
10 Name
11 ====
12
13 v4l2-munmap - Unmap device memory
14
15 Synopsis
16 ========
17
18 .. code-block:: c
19
20 #include <unistd.h>
21 #include <sys/mman.h>
22
23 .. c:function:: int munmap( void *start, size_
24
25 Arguments
26 =========
27
28 ``start``
29 Address of the mapped buffer as returned b
30 :c:func:`mmap()` function.
31
32 ``length``
33 Length of the mapped buffer. This must be
34 :c:func:`mmap()` and returned by the drive
35 :c:type:`v4l2_buffer` ``length`` field for
36 single-planar API and in the struct
37 :c:type:`v4l2_plane` ``length`` field for
38 multi-planar API.
39
40 Description
41 ===========
42
43 Unmaps a previously with the :c:func:`mmap()`
44 buffer and frees it, if possible.
45
46 Return Value
47 ============
48
49 On success :c:func:`munmap()` returns 0, on fa
50 ``errno`` variable is set appropriately:
51
52 EINVAL
53 The ``start`` or ``length`` is incorrect,
54 mapped yet.
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