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

XkbSetServerInternalMods(3)		  XKB FUNCTIONS 	      XkbSetServerInternalMods(3)

       XkbSetServerInternalMods  -  Sets  the  modifiers  that	are consumed by the server before
       events are delivered to the client

       Bool XkbSetServerInternalMods (Display *display, unsigned int  device_spec,  unsigned  int
	      affect_real,  unsigned  int  real_values, unsigned int affect_virtual, unsigned int

       - display
	      connection to the X server

       - device_spec
	      device ID, or XkbUseCoreKbd

       - affect_real
	      mask of real modifiers affected by this call

       - real_values
	      values for affected real modifiers (1=>set, 0=>unset)

       - affect_virtual
	      mask of virtual modifiers affected by this call

       - virtual_values
	      values for affected virtual modifiers (1=>set, 0=>unset)

       The core protocol does not provide any means to prevent a modifier from being reported  in
       events  sent to clients; Xkb, however makes this possible via the InternalMods control. It
       specifies modifiers that should be consumed by the server and  not  reported  to  clients.
       When  a	key is pressed and a modifier that has its bit set in the InternalMods control is
       reported to the server, the server uses the modifier when determining the actions to apply
       for the key. The server then clears the bit, so it is not actually reported to the client.
       In addition, modifiers specified in the InternalMods control are  not  used  to	determine
       grabs and are not used to calculate core protocol compatibility state.

       Manipulate  the	InternalMods  control via the internal field in the XkbControlsRec struc-
       ture, using XkbSetControls  and	XkbGetControls.   Alternatively,  use  XkbSetServerInter-

       XkbSetServerInternalMods  sends	a  request to the server to change the internal modifiers
       consumed by the server.	affect_real and real_values are masks of real modifier bits indi-
       cating  which  real modifiers are to be added and removed from the server's internal modi-
       fiers control. Modifiers selected by both affect_real and real_values  are  added  to  the
       server's  internal modifiers control; those selected by affect_real but not by real_values
       are removed from the server's internal modifiers mask. Valid values  for  affect_real  and
       real_values  consist  of any combination of the eight core modifier bits: ShiftMask, Lock-
       Mask, ControlMask, Mod1Mask - Mod5Mask.	affect_virtual and virtual_values  are	masks  of
       virtual	modifier bits indicating which virtual modifiers are to be added and removed from
       the server's internal modifiers control. Modifiers selected  by	both  affect_virtual  and
       virtual_values  are  added  to  the server's internal modifiers control; those selected by
       affect_virtual but not by virtual_values are removed from the server's internal	modifiers
       control. See below for a discussion of virtual modifier masks to use in affect_virtual and
       virtual_values. XkbSetServerInternalMods does not wait for a reply  from  the  server.  It
       returns True if the request was sent and False otherwise.

       Virtual	modifiers  are named by converting their string name to an X Atom and storing the
       Atom in the names.vmods array in an XkbDescRec structure. The position of a name  Atom  in
       the  names.vmods array defines the bit position used to represent the virtual modifier and
       also the index used when accessing virtual modifier information in arrays: the name in the
       i-th  (0  relative)  entry of names.vmods is the i-th virtual modifier, represented by the
       mask (1<<i). Throughout Xkb, various functions have a parameter that is a mask  represent-
       ing  virtual  modifier choices. In each case, the i-th bit (0 relative) of the mask repre-
       sents the i-th virtual modifier.

       To set the name of a virtual modifier, use XkbSetNames,	using  XkbVirtualModNamesMask  in
       which and the name in the xkb argument; to retrieve indicator names, use XkbGetNames.

       The  complete  description  of  an  Xkb	keyboard is given by an XkbDescRec. The component
       structures in the XkbDescRec represent the major Xkb components outlined in Figure 1.1.

       typedef struct {
	   struct _XDisplay * display;	    /* connection to X server */
	   unsigned short     flags;	    /* private to Xkb, do not modify */
	   unsigned short     device_spec;  /* device of interest */
	   KeyCode	      min_key_code; /* minimum keycode for device */
	   KeyCode	      max_key_code; /* maximum keycode for device */
	   XkbControlsPtr     ctrls;	    /* controls */
	   XkbServerMapPtr    server;	    /* server keymap */
	   XkbClientMapPtr    map;	    /* client keymap */
	   XkbIndicatorPtr    indicators;   /* indicator map */
	   XkbNamesPtr	      names;	    /* names for all components */
	   XkbCompatMapPtr    compat;	    /* compatibility map */
	   XkbGeometryPtr     geom;	    /* physical geometry of keyboard */
       } XkbDescRec, *XkbDescPtr;

       The display field points to an X display structure. The flags  field  is  private  to  the
       library:  modifying flags may yield unpredictable results. The device_spec field specifies
       the device identifier of the keyboard input device, or XkbUseCoreKeyboard, which specifies
       the  core  keyboard device. The min_key_code and max_key_code fields specify the least and
       greatest keycode that can be returned by the keyboard.

       Each structure component has a corresponding mask bit that is used in  function	calls  to
       indicate that the structure should be manipulated in some manner, such as allocating it or
       freeing it. These masks and their relationships to the fields in the XkbDescRec are  shown
       in Table 1.

	       Table 1 Mask Bits for XkbDescRec
       Mask Bit 	      XkbDescRec Field	 Value
       XkbControlsMask	      ctrls		 (1L<<0)
       XkbServerMapMask       server		 (1L<<1)
       XkbIClientMapMask      map		 (1L<<2)
       XkbIndicatorMapMask    indicators	 (1L<<3)
       XkbNamesMask	      names		 (1L<<4)
       XkbCompatMapMask       compat		 (1L<<5)
       XkbGeometryMask	      geom		 (1L<<6)
       XkbGetControls(3), XkbGetNames(3), XkbSetControls(3), XkbSetNames(3)
       XkbAllComponentsMask   All Fields	 (0x7f)

       SEE ALSO

X Version 11				   libX11 1.6.0 	      XkbSetServerInternalMods(3)

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