XkbAllocDeviceInfo - Obtain an XkbDeviceInfoRec structure


   XkbDeviceInfoPtr XkbAllocDeviceInfo (unsigned int device_spec, unsigned
          int n_buttons, unsigned int sz_leds);


   - device_spec
          device ID with which structure will be used

   - n_buttons
          number of button actions to allocate space for

   - sz_leds
          number of LED feedbacks to allocate space for


   XkbAllocDeviceInfo allocates space for  an  XkbDeviceInfoRec  structure
   and  initializes  that structure's device_spec field with the device ID
   specified  by  device_spec.   If  n_buttons   is   nonzero,   n_buttons
   XkbActions   are   linked   into  the  XkbDeviceInfoRec  structure  and
   initialized to zero. If sz_leds is nonzero, sz_leds XkbDeviceLedInfoRec
   structures  are  also  allocated  and  linked into the XkbDeviceInfoRec
   structure. If you request XkbDeviceLedInfoRec structures  be  allocated
   using this request, you must initialize them explicitly.

   To obtain an XkbDeviceLedInfoRec structure, use XkbAllocDeviceLedInfo.


   Information  about  X  Input Extension devices is transferred between a
   client program and the Xkb extension in an XkbDeviceInfoRec structure:

       typedef struct {
           char *               name;          / name for device */
           Atom                 type;          / name for class of devices */
           unsigned short       device_spec;   / device of interest */
           Bool                 has_own_state; / True=>this device has its own state */
           unsigned short       supported;     / bits indicating supported capabilities */
           unsigned short       unsupported;   / bits indicating unsupported capabilities */
           unsigned short       num_btns;      / number of entries in btn_acts */
           XkbAction *          btn_acts;      / button actions */
           unsigned short       sz_leds;       / total number of entries in LEDs vector */
           unsigned short       num_leds;      / number of valid entries in LEDs vector */
           unsigned short       dflt_kbd_fb;   / input extension ID of default (core kbd) indicator */
           unsigned short       dflt_led_fb;   / input extension ID of default indicator feedback */
           XkbDeviceLedInfoPtr  leds;          / LED descriptions */
       } XkbDeviceInfoRec, *XkbDeviceInfoPtr;

       typedef struct {
           unsigned short      led_class;        / class for this LED device*/
           unsigned short      led_id;           / ID for this LED device */
           unsigned int        phys_indicators;  / bits for which LEDs physically present */
           unsigned int        maps_present;     / bits for which LEDs have maps in maps */
           unsigned int        names_present;    / bits for which LEDs are in names */
           unsigned int        state;            / 1 bit => corresponding LED is on */
           Atom                names[XkbNumIndicators];   / names for LEDs */
           XkbIndicatorMapRec  maps;             / indicator maps for each LED */
       } XkbDeviceLedInfoRec, *XkbDeviceLedInfoPtr;



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