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CentOS 7.0 - man page for xkballocdeviceinfo (centos section 3)

XkbAllocDeviceInfo(3)			  XKB FUNCTIONS 		    XkbAllocDeviceInfo(3)

       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  ini-
       tialized  to  zero. If sz_leds is nonzero, sz_leds XkbDeviceLedInfoRec structures are also
       allocated and linked into the XkbDeviceInfoRec structure. If you  request  XkbDeviceLedIn-
       foRec 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;


X Version 11				   libX11 1.6.0 		    XkbAllocDeviceInfo(3)

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