Dmitry Torokhov wrote:
> --- a/include/linux/input.h
> +++ b/include/linux/input.h
> @@ -56,22 +56,35 @@ struct input_absinfo {
> __s32 resolution;
> };
>
> -struct keycode_table_entry {
> - __u32 keycode; /* e.g. KEY_A */
> - __u32 index; /* Index for the given scan/key table, on EVIOCGKEYCODEBIG */
> - __u32 len; /* Length of the scancode */
> - __u32 reserved[2]; /* Reserved for future usage */
> - char *scancode; /* scancode, in machine-endian */
> +/**
> + * struct keymap_entry - used by EVIOCGKEYCODE/EVIOCSKEYCODE ioctls
> + * @scancode: scancode represented in machine-endian form.
> + * @len: length of the scancode that resides in @scancode buffer.
> + * @index: index in the keymap, may be used instead of scancode
> + * @by_index: boolean value indicating that kernel should perform
> + * lookup in keymap by @index instead of @scancode
> + * @keycode: key code assigned to this scancode
> + *
> + * The structure is used to retrieve and modify keymap data. Users have
> + * of performing lookup either by @scancode itself or by @index in
> + * keymap entry. EVIOCGKEYCODE will also return scancode or index
> + * (depending on which element was used to perform lookup).
> + */
> +struct keymap_entry {
> + __u8 len;
> + __u8 by_index;
> + __u16 index;
> + __u32 keycode;
> + __u8 scancode[32];
> };
I agree with Dimitry; don't put a pointer typed member into a userspace
ABI struct.
Two remarks:
- Presently, <linux/input.h> defines three structs named input_... for
userspace, two structs named input_... for kernelspace, and a few
structs named ff_... specially for force-feedback stuff. How about
calling struct keymap_entry perhaps struct input_keymap_entry
instead, to keep namespaces tidy?
- I take it from your description that scan codes are fundamentally
variable-length data. How about defining it as __u8 scancode[0]?
--
Stefan Richter
-=====-==-=- -=== =====
http://arcgraph.de/sr/
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