On Friday 02 December 2011 17:12:56 Ming Lei wrote:
> +/**
> + * struct v4l2_fd_result - VIDIOC_G_FD_RESULT argument
> + * @buf_index: entry, index of v4l2_buffer for face detection
> + * @face_cnt: return, how many faces detected from the @buf_index
> + * @fd: return, result of faces' detection
> + */
> +struct v4l2_fd_result {
> + __u32 buf_index;
> + __u32 face_cnt;
> + __u32 reserved[6];
> + struct v4l2_fd_detection *fd;
> +};
This data structure is not 32/64 bit safe: running a 64 bit kernel with 32 bit
user space will see an incompatible layout.
One way to solve this is to remove the pointer and just start the array
directly after the __u32 members. Alternatively, you can use a __u64
to pass the pointer in an integer representation.
A nicer interface from the data structure perspective would be to
get rid of the array altogether and always return exactly one face.
Arnd
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