XkbLockGroup - Locks the keysym group

display
              connection to the X server

       device_spec
              device ID, or XkbUseCoreKbd

       group  index of the keysym group to lock

XkbLockGroup  sends a request to the server to lock the specified group and does not wait for a reply. It
       returns True if the request was sent and False otherwise.

       Reference the keysym group indices with these symbolic constants:

       Table 1 Symbolic Group Names
       ─────────────────────────────
       Symbolic Name       Value
       ─────────────────────────────
       XkbGroup1Index      0
       XkbGroup2Index      1
       XkbGroup3Index      2
       XkbGroup4Index      3

       XkbLockGroup -  Locks the keysym group

       True           The XkbLockGroup function returns True when a request was sent to the server to  lock  the
                      specified group and does not wait for a reply.

       False          The XkbLockGroup function returns False if the request was not sent.

X Version 11                                      libX11 1.8.12                                  XkbLockGroup(3)

BoolXkbLockGroup(Display*display,unsignedintdevice_spec,unsignedintgroup);