1 .. SPDX-License-Identifier: GFDL-1.1-no-invari 1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
2 .. c:namespace:: DTV.dmx 2 .. c:namespace:: DTV.dmx
3 3
4 .. _dmx-munmap: 4 .. _dmx-munmap:
5 5
6 ************ 6 ************
7 DVB munmap() 7 DVB munmap()
8 ************ 8 ************
9 9
10 Name 10 Name
11 ==== 11 ====
12 12
13 dmx-munmap - Unmap device memory 13 dmx-munmap - Unmap device memory
14 14
15 .. warning:: This API is still experimental. 15 .. warning:: This API is still experimental.
16 16
17 Synopsis 17 Synopsis
18 ======== 18 ========
19 19
20 .. code-block:: c 20 .. code-block:: c
21 21
22 #include <unistd.h> 22 #include <unistd.h>
23 #include <sys/mman.h> 23 #include <sys/mman.h>
24 24
25 .. c:function:: int munmap( void *start, size_ 25 .. c:function:: int munmap( void *start, size_t length )
26 26
27 Arguments 27 Arguments
28 ========= 28 =========
29 29
30 ``start`` 30 ``start``
31 Address of the mapped buffer as returned b 31 Address of the mapped buffer as returned by the
32 :c:func:`mmap()` function. 32 :c:func:`mmap()` function.
33 33
34 ``length`` 34 ``length``
35 Length of the mapped buffer. This must be 35 Length of the mapped buffer. This must be the same value as given to
36 :c:func:`mmap()`. 36 :c:func:`mmap()`.
37 37
38 Description 38 Description
39 =========== 39 ===========
40 40
41 Unmaps a previously with the :c:func:`mmap()` 41 Unmaps a previously with the :c:func:`mmap()` function mapped
42 buffer and frees it, if possible. 42 buffer and frees it, if possible.
43 43
44 Return Value 44 Return Value
45 ============ 45 ============
46 46
47 On success :c:func:`munmap()` returns 0, on fa 47 On success :c:func:`munmap()` returns 0, on failure -1 and the
48 ``errno`` variable is set appropriately: 48 ``errno`` variable is set appropriately:
49 49
50 EINVAL 50 EINVAL
51 The ``start`` or ``length`` is incorrect, 51 The ``start`` or ``length`` is incorrect, or no buffers have been
52 mapped yet. 52 mapped yet.
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