0001 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
0002 .. c:namespace:: DTV.dmx
0003
0004 .. _dmx-munmap:
0005
0006 ************
0007 DVB munmap()
0008 ************
0009
0010 Name
0011 ====
0012
0013 dmx-munmap - Unmap device memory
0014
0015 .. warning:: This API is still experimental.
0016
0017 Synopsis
0018 ========
0019
0020 .. code-block:: c
0021
0022 #include <unistd.h>
0023 #include <sys/mman.h>
0024
0025 .. c:function:: int munmap( void *start, size_t length )
0026
0027 Arguments
0028 =========
0029
0030 ``start``
0031 Address of the mapped buffer as returned by the
0032 :c:func:`mmap()` function.
0033
0034 ``length``
0035 Length of the mapped buffer. This must be the same value as given to
0036 :c:func:`mmap()`.
0037
0038 Description
0039 ===========
0040
0041 Unmaps a previously with the :c:func:`mmap()` function mapped
0042 buffer and frees it, if possible.
0043
0044 Return Value
0045 ============
0046
0047 On success :c:func:`munmap()` returns 0, on failure -1 and the
0048 ``errno`` variable is set appropriately:
0049
0050 EINVAL
0051 The ``start`` or ``length`` is incorrect, or no buffers have been
0052 mapped yet.
