Provided by: libx11-doc_1.6.9-2ubuntu1_all bug


       XkbVirtualModsToReal  -  Determines  the  mapping  of virtual modifiers to core X protocol


       Bool  XkbVirtualModsToReal  (XkbDescPtr  xkb,  unsigned  int  virtual_mask,  unsigned  int


       - xkb  keyboard description for input device

       - virtual_mask
              virtual modifier mask to translate

       - mask_rtrn
              backfilled with real modifiers


       Xkb  maintains  a  virtual  modifier mapping, which lists the virtual modifiers associated
       with, or bound to, each key. The real modifiers bound to a virtual modifier always include
       all  of the modifiers bound to any of the keys that specify that virtual modifier in their
       virtual modifier mapping. The server.vmodmap array indicates which virtual  modifiers  are
       bound  to  each  key;  each  entry  is  a  bitmask  for  the  virtual  modifier  bits. The
       server.vmodmap array is indexed by keycode.

       The vmodmap and vmods members  of  the  server  map  are  the  "master"  virtual  modifier
       definitions.  Xkb automatically propagates any changes to these fields to all other fields
       that use virtual modifier mappings.

       For example, if Mod3 is bound to the Num_Lock key by the core protocol  modifier  mapping,
       and  the  NumLock  virtual  modifier is bound to they Num_Lock key by the virtual modifier
       mapping, Mod3 is added to the set of modifiers associated with NumLock.

       The virtual modifier mapping  is  normally  updated  whenever  actions  are  automatically
       applied to symbols and few applications should need to change the virtual modifier mapping

       Use XkbGetMap to get the virtual modifiers from the server  or  use  XkbGetVirtualMods  to
       update  a local copy of the virtual modifiers bindings from the server. To set the binding
       of a virtual modifier to a real modifier, use XkbGetVirtualMods

       If the keyboard description defined  by  xkb  includes  bindings  for  virtual  modifiers,
       XkbVirtualModsToReal  uses  those  bindings  to  determine  the set of real modifiers that
       correspond to the set of virtual modifiers specified in  virtual_mask.   The  virtual_mask
       parameter  is  a  mask  specifying  the  virtual  modifiers  to translate; the i-th bit (0
       relative) of the mask represents the i-th virtual  modifier.  If  mask_rtrn  is  non-NULL,
       XkbVirtualModsToReal  backfills  it with the resulting real modifier mask. If the keyboard
       description in xkb  does  not  include  virtual  modifier  bindings,  XkbVirtualModsToReal
       returns False; otherwise, it returns True.


       True           The  XkbVirtualModsToReal function returns True if the keyboard description
                      in xkb does include virtual modifier bindings.

       False          The XkbVirtualModsToReal function returns False if the keyboard description
                      in xkb does not include virtual modifier bindings.


       XkbGetMap(3), XkbGetVirtualMods(3)


       It  is  possible for a local (client-side) keyboard description (the xkb parameter) to not
       contain any virtual modifier information (simply because the client has not requested  it)
       while the server's corresponding definition may contain virtual modifier information.