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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  pos-
       sible  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  determin-
       ing  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  Xkb-
       ControlsRec structure, using XkbSetControls and XkbGetControls.  Alter-
       natively, use XkbSetServerInternalMods.

       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 indicating which real modifiers are  to
       be added and removed from the server's internal modifiers control. Mod-
       ifiers 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 com-
       bination of the eight core modifier bits: ShiftMask, LockMask, Control-
       Mask, 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. Modi-
       fiers selected by both affect_virtual and virtual_values are  added  to
       the  server's internal modifiers control; those selected by affect_vir-
       tual 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 func-
       tions  have  a  parameter  that is a mask representing virtual modifier
       choices. In each case, the i-th bit (0 relative) of the mask represents
       the i-th virtual modifier.

       To  set  the name of a virtual modifier, use XkbSetNames, using XkbVir-
       tualModNamesMask 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 com-
       ponents 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.

       c s s l l l l l l.  Table 1 Mask Bits for XkbDescRec _ Mask Bit  XkbDe-
       scRec  Field   Value   _   XkbControlsMask     ctrls     (1L<<0)   Xkb-
       ServerMapMask    server    (1L<<1)     XkbIClientMapMask   map  (1L<<2)
       XkbIndicatorMapMask indicators     (1L<<3)                    XkbNames-
       Mask   names     (1L<<4) XkbCompatMapMask    compat    (1L<<5) XkbGeom-
       etryMask     geom (1L<<6)                  XkbAllComponentsMask     All
       Fields     (0x7f)

       XkbGetControls(3), XkbGetNames(3), XkbSetControls(3), XkbSetNames(3)

X Version 11                     libX11 1.1.5      XkbSetServerInternalMods(3)