x11r4 man page for xkblockmodifiers

XkbLockModifiers(3)						   XKB FUNCTIONS					       XkbLockModifiers(3)

NAME
       XkbLockModifiers -  Locks and unlocks any of the eight real keyboard modifiers

SYNOPSIS
       Bool XkbLockModifiers ( display, device_spec, affect, values )
	     Display *display;
	     unsigned int device_spec;
	     unsigned int affect;
	     unsigned int values;

ARGUMENTS
       display
	      connection to the X server

       device_spec
	      device ID, or XkbUseCoreKbd

       affect mask of real modifiers whose lock state is to change

       values 1 => lock, 0 => unlock; only for modifiers selected by affect

DESCRIPTION
       XkbLockModifiers  sends	a request to the server to lock the real modifiers selected by both affect and values and to unlock the real modi-
       fiers selected by affect, but not selected by values. XkbLockModifiers does not wait for a reply from the server. It returns  True  if  the
       request was sent, and False otherwise.

       The  functions  in  this  section  that change the use of modifiers use a mask in the parameter affect. It is a bitwise inclusive OR of the
       legal modifier masks:

       Table 1 Real Modifier Masks
       ----------------------------
       Mask
       ----------------------------
       ShiftMask
       LockMask
       ControlMask
       Mod1Mask
       Mod2Mask
       Mod3Mask
       Mod4Mask
       Mod5Mask

RETURN VALUES
       True	      The XkbLockModifiers function returns True if a request is sent to the server to lock the real modifiers	selected  by  both
		      affect and values and to unlock the real modifiers selected by affect, but not selected by values.

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

X Version 11							   libX11 1.2.1 					       XkbLockModifiers(3)