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X11R7.4 - man page for xkbadddeviceledinfo (x11r4 section 3)

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XkbAddDeviceLedInfo(3)			  XKB FUNCTIONS 		   XkbAddDeviceLedInfo(3)

NAME
       XkbAddDeviceLedInfo - Initialize an XkbDeviceLedInfoRec structure

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

ARGUMENTS
       - 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

DESCRIPTION
       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
       XkbResizeDeviceButtonActions.

STRUCTURES
       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;

SEE ALSO
       XkbResizeDeviceButtonActions(3)

X Version 11				   libX11 1.2.1 		   XkbAddDeviceLedInfo(3)
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