Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) .. c:namespace:: DTV.dmx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) .. _dmx-munmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) ************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) DVB munmap()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) ************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) Name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) ====
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) dmx-munmap - Unmap device memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) .. warning:: This API is still experimental.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) Synopsis
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) ========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) .. code-block:: c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)     #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)     #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) .. c:function:: int munmap( void *start, size_t length )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) Arguments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) =========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) ``start``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)     Address of the mapped buffer as returned by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)     :c:func:`mmap()` function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) ``length``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)     Length of the mapped buffer. This must be the same value as given to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)     :c:func:`mmap()`.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) Description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) ===========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) Unmaps a previously with the :c:func:`mmap()` function mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) buffer and frees it, if possible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) Return Value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) ============
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) On success :c:func:`munmap()` returns 0, on failure -1 and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) ``errno`` variable is set appropriately:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) EINVAL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)     The ``start`` or ``length`` is incorrect, or no buffers have been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)     mapped yet.