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

XkbAddDeviceLedInfo(3)			  XKB FUNCTIONS 		   XkbAddDeviceLedInfo(3)

       XkbAddDeviceLedInfo - Initialize an XkbDeviceLedInfoRec structure

       XkbDeviceLedInfoPtr   XkbAddDeviceLedInfo   (XkbDeviceInfoPtr  device_info,  unsigned  int
	      led_class, unsigned int led_id);

       - device_info
	      structure in which to add LED info

       - led_class
	      input extension class for LED device of interest

       - led_id
	      input extension ID for LED device of interest

       XkbAddDeviceLedInfo first checks to see whether an entry  matching  led_class  and  led_id
       already	exists in the device_info->leds array. If it finds a matching entry, it returns a
       pointer to that entry. Otherwise, it checks to be sure there is at least one  empty  entry
       in  device_info->leds  and  extends  it	if  there  is not enough room. It then increments
       device_info->num_leds and fills in the next  available  entry  in  device_info->leds  with
       led_class and led_id.

       If  successful, XkbAddDeviceLedInfo returns a pointer to the XkbDeviceLedInfoRec structure
       that was initialized. If unable to allocate sufficient storage, or if  device_info  points
       to  an  invalid	XkbDeviceInfoRec  structure, or if led_class or led_id are inappropriate,
       XkbAddDeviceLedInfo returns NULL.

       To allocate additional space for button actions	in  an	XkbDeviceInfoRec  structure,  use

       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 		   XkbAddDeviceLedInfo(3)

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