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       XkbSetCompatMap - Modify the server's compatibility map


       Bool  XkbSetCompatMap (Display *display, unsigned int which, XkbDescPtr
              xkb, Bool update_actions);


       - display
              connection to server

       - which
              mask of compat map components to set

       - xkb  source for compat map components

       - update_actions
              True => apply to server's keyboard map


       To modify the server's compatibility map, first modify a local copy  of
       the Xkb compatibility map, then call XkbSetCompatMap.  You may allocate
       a new compatibility map for this purpose using XkbAllocCompatMap.   You
       may also use a compatibility map from another server, although you need
       to adjust the device_spec field in  the  XkbDescRec  accordingly.  Note
       that symbol interpretations in a compatibility map ( sym_interpret, the
       vector of XkbSymInterpretRec structures) are also allocated using  this
       same function.

       XkbSetCompatMap  copies compatibility map information from the keyboard
       description in xkb to the server specified in display device_spec field
       of  xkb.   Unless  you have specifically modified this field, it is the
       default  keyboard  device.   which  specifies  the  compatibility   map
       components to be set, and is an inclusive OR of the bits shown in Table

                 Table 1 Compatibility Map Component Masks
       Mask                 Value    Affecting
       XkbSymInterpMask     (1<<0)   Symbol interpretations
       XkbGroupCompatMask   (1<<1)   Group maps
       XkbAllCompatMask     (0x3)    All compatibility map components

       After updating its compatibility  map  for  the  specified  device,  if
       update_actions is True, the server applies the new compatibility map to
       its entire keyboard for the  device  to  generate  a  new  set  of  key
       semantics,  compatibility  state,  and  a  new  core  keyboard  map. If
       update_actions is False, the new  compatibility  map  is  not  used  to
       generate  any  modifications to the current device semantics, state, or
       core keyboard map. One reason for not applying  the  compatibility  map
       immediately  would  be  if  one  server  was  being configured to match
       another on a piecemeal basis; the  map  should  not  be  applied  until
       everything  is  updated.  To  force  an  update  at  a  later time, use
       XkbSetCompatMap specifying which as zero and update_actions as True.

       XkbSetCompatMap returns True if successful and False  if  unsuccessful.
       The  server  may  report  problems  it  encounters  when processing the
       request subsequently via protocol errors.


       True           The XkbSetCompatMap function returns True if successful.

       False          The   XkbSetCompatMap   function   returns   False    if


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

       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 2.

               Table 2 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)
       XkbAllComponentsMask   All Fields         (0x7f)

       The XkbSymInterpretRec structure specifies a symbol interpretation:

           typedef struct {
               KeySym        sym;         /∗ keysym of interest or NULL */
               unsigned char flags;       /∗ XkbSI_AutoRepeat, XkbSI_LockingKey */
               unsigned char match;       /∗ specifies how mods is interpreted */
               unsigned char mods;        /∗ modifier bits, correspond to eight real modifiers */
               unsigned char virtual_mod; /∗ 1 modifier to add to key virtual mod map */
               XkbAnyAction  act;         /∗ action to bind to symbol position on key */
           } XkbSymInterpretRec,*XkbSymInterpretPtr;



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