From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- .../userspace-api/media/v4l/func-munmap.rst | 54 ++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 Documentation/userspace-api/media/v4l/func-munmap.rst (limited to 'Documentation/userspace-api/media/v4l/func-munmap.rst') diff --git a/Documentation/userspace-api/media/v4l/func-munmap.rst b/Documentation/userspace-api/media/v4l/func-munmap.rst new file mode 100644 index 000000000..077d58333 --- /dev/null +++ b/Documentation/userspace-api/media/v4l/func-munmap.rst @@ -0,0 +1,54 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L + +.. _func-munmap: + +************* +V4L2 munmap() +************* + +Name +==== + +v4l2-munmap - Unmap device memory + +Synopsis +======== + +.. code-block:: c + + #include + #include + +.. c:function:: int munmap( void *start, size_t length ) + +Arguments +========= + +``start`` + Address of the mapped buffer as returned by the + :c:func:`mmap()` function. + +``length`` + Length of the mapped buffer. This must be the same value as given to + :c:func:`mmap()` and returned by the driver in the struct + :c:type:`v4l2_buffer` ``length`` field for the + single-planar API and in the struct + :c:type:`v4l2_plane` ``length`` field for the + multi-planar API. + +Description +=========== + +Unmaps a previously with the :c:func:`mmap()` function mapped +buffer and frees it, if possible. + +Return Value +============ + +On success :c:func:`munmap()` returns 0, on failure -1 and the +``errno`` variable is set appropriately: + +EINVAL + The ``start`` or ``length`` is incorrect, or no buffers have been + mapped yet. -- cgit v1.2.3