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

XkbGetDeviceLedInfo(3)			  XKB FUNCTIONS 		   XkbGetDeviceLedInfo(3)

       XkbGetDeviceLedInfo  -  Query  the indicator names, maps, and state associated with an LED
       feedback of an input extension device

       Status XkbGetDeviceLedInfo  (Display  *dpy,  XkbDeviceInfoPtr  device_info,  unsigned  int
	      led_class, unsigned int led_id, unsigned int which);

       - dpy  connection to X server

       - device_info
	      structure to update with results

       - led_class
	      LED feedback class assigned by input extension

       - led_id
	      LED feedback ID assigned by input extension

       - which
	      mask indicating desired information

       XkbGetDeviceLedInfo  queries  the  server for the desired LED information for the feedback
       specified by  led_class	and  led_id  for  the  X  input  extension  device  indicated  by
       device_spec->device_info  and  waits for a reply. If successful, XkbGetDeviceLedInfo back-
       fills the relevant fields of device_info as determined  by  which  with	the  results  and
       returns	Success.  Valid  values for which are the inclusive OR of any of XkbXI_Indicator-
       NamesMask, XkbXI_IndicatorMapsMask, and XkbXI_IndicatorStateMask.

       The fields of device_info that are filled in when this request succeeds	are  name,  type,
       supported,  and unsupported, and portions of the leds structure corresponding to led_class
       and led_id as indicated by the bits set in which.  The device_info->leds vector	is  allo-
       cated  if  necessary  and  sz_leds  and	num_leds  filled  in.  The  led_class, led_id and
       phys_indicators fields of the  device_info->leds  entry	corresponding  to  led_class  and
       led_id are always filled in.

       If  which  contains  XkbXI_IndicatorNamesMask,  the  names_present and names fields of the
       device_info->leds structure corresponding to led_class and led_id are  updated,	if  which
       contains  XkbXI_IndicatorStateMask, the corresponding state field is updated, and if which
       contains XkbXI_IndicatorMapsMask, the maps_present and maps fields are updated.

       If a compatible version of Xkb is not available in the server or the Xkb extension has not
       been  properly  initialized,  XkbGetDeviceLedInfo  returns BadAccess. If allocation errors
       occur, a BadAlloc status is returned. If the device has no indicators, a BadMatch error is
       returned.  If ledClass or ledID have illegal values, a BadValue error is returned. If they
       have legal values but do not specify a feedback that contains LEDs and is associated  with
       the specified device, a BadMatch error is returned.

       BadAccess      The Xkb extension has not been properly initialized

       BadAlloc       Unable to allocate storage

       BadMatch       A  compatible version of Xkb was not available in the server or an argument
		      has correct type and range, but is otherwise invalid

       BadValue       An argument is out of range

X Version 11				   libX11 1.6.0 		   XkbGetDeviceLedInfo(3)

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