diff options
Diffstat (limited to 'Documentation/media/uapi/v4l/func-mmap.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/func-mmap.rst | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/Documentation/media/uapi/v4l/func-mmap.rst b/Documentation/media/uapi/v4l/func-mmap.rst index c156fb7b7422..6d2ce539bd72 100644 --- a/Documentation/media/uapi/v4l/func-mmap.rst +++ b/Documentation/media/uapi/v4l/func-mmap.rst @@ -21,8 +21,8 @@ Synopsis #include <sys/mman.h> -.. cpp:function:: void *mmap( void *start, size_t length, int prot, int flags, int fd, off_t offset ) - +.. c:function:: void *mmap( void *start, size_t length, int prot, int flags, int fd, off_t offset ) + :name: v4l2-mmap Arguments ========= @@ -37,9 +37,9 @@ Arguments ``length`` Length of the memory area to map. This must be the same value as returned by the driver in the struct - :ref:`v4l2_buffer <v4l2-buffer>` ``length`` field for the + :c:type:`v4l2_buffer` ``length`` field for the single-planar API, and the same value as returned by the driver in - the struct :ref:`v4l2_plane <v4l2-plane>` ``length`` field for + the struct :c:type:`v4l2_plane` ``length`` field for the multi-planar API. ``prot`` @@ -78,7 +78,9 @@ Arguments ``MAP_SHARED`` allows applications to share the mapped memory with other (e. g. child-) processes. - .. note:: The Linux ``videobuf`` module which is used by some + .. note:: + + The Linux ``videobuf`` module which is used by some drivers supports only ``MAP_SHARED``. ``MAP_PRIVATE`` requests copy-on-write semantics. V4L2 applications should not set the ``MAP_PRIVATE``, ``MAP_DENYWRITE``, ``MAP_EXECUTABLE`` or ``MAP_ANON`` @@ -90,9 +92,9 @@ Arguments ``offset`` Offset of the buffer in device memory. This must be the same value as returned by the driver in the struct - :ref:`v4l2_buffer <v4l2-buffer>` ``m`` union ``offset`` field for + :c:type:`v4l2_buffer` ``m`` union ``offset`` field for the single-planar API, and the same value as returned by the driver - in the struct :ref:`v4l2_plane <v4l2-plane>` ``m`` union + in the struct :c:type:`v4l2_plane` ``m`` union ``mem_offset`` field for the multi-planar API. |