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X11R7.4 - man page for xkbsetserverinternalmods (x11r4 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,   device_spec,   affect_real,   real_values,
       affect_virtual, virtual_values )
	     Display *display;
	     unsigned int device_spec;
	     unsigned int affect_real;
	     unsigned int real_values;
	     unsigned int affect_virtual;
	     unsigned int virtual_values;

       - 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 1.2.1 	      XkbSetServerInternalMods(3)

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