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

XkbGetIndicatorState(3) 		  XKB FUNCTIONS 		  XkbGetIndicatorState(3)

       XkbGetIndicatorState - Obtains the current state of the keyboard indicators

       Status  XkbGetIndicatorState  (Display  *display,  unsigned  int device_spec, unsigned int

       - display
	      connection to the X server

       - device_spec
	      device ID, or XkbUseCoreKbd

       - state_return
	      backfilled with a mask of the indicator state

       Xkb allows applications to obtain information about indicators using two  different  meth-
       ods. The first method, which is similar to the core X implementation, uses a mask to spec-
       ify the indicators. The second method, which is more suitable for  applications	concerned
       with interoperability, uses indicator names. The correspondence between the indicator name
       and the bit position in masks is as follows: one of the parameters returned  from  XkbGet-
       NamedIndicators	is  an	index  that  is the bit position to use in any function call that
       requires a mask of indicator bits, as well as the indicator's index into the XkbIndicator-
       Rec array of indicator maps.

       XkbGetIndicatorState  queries  the  display  for the state of the indicators on the device
       specified by the device_spec.  For each indicator that is "turned on" on the  device,  the
       associated  bit	is  set in state_return.  If a compatible version of the Xkb extension is
       not available in the server, XkbGetIndicatorState returns a BadMatch error. Otherwise,  it
       sends  the  request to the X server, places the state of the indicators into state_return,
       and returns Success. Thus the value reported by XkbGetIndicatorState is identical  to  the
       value reported by the core protocol.

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


X Version 11				   libX11 1.6.0 		  XkbGetIndicatorState(3)

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