.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: DTV.dmx
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.. _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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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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:c:func:`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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:c:func:`mmap()`.
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Description
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===========
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Unmaps a previously with the :c:func:`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 :c:func:`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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