f8aaf48771
With the new dmx mmap interface, those two syscalls are now handled by the subsystem. Document them. This patch is based on the V4L2 text for those ioctls. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
55 lines
924 B
ReStructuredText
55 lines
924 B
ReStructuredText
.. _dmx-munmap:
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************
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DVB munmap()
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************
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Name
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====
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dmx-munmap - Unmap device memory
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.. warning:: This API is still experimental.
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Synopsis
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========
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.. code-block:: c
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#include <unistd.h>
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#include <sys/mman.h>
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.. c:function:: int munmap( void *start, size_t length )
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:name: dmx-munmap
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Arguments
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=========
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``start``
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Address of the mapped buffer as returned by the
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:ref:`mmap() <dmx-mmap>` function.
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``length``
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Length of the mapped buffer. This must be the same value as given to
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:ref:`mmap() <dmx-mmap>`.
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Description
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===========
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Unmaps a previously with the :ref:`mmap() <dmx-mmap>` function mapped
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buffer and frees it, if possible.
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Return Value
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============
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On success :ref:`munmap() <dmx-munmap>` returns 0, on failure -1 and the
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``errno`` variable is set appropriately:
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EINVAL
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The ``start`` or ``length`` is incorrect, or no buffers have been
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mapped yet.
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