XkbLockModifiers man page

XkbLockModifiers — Locks and unlocks any of the eight real keyboard modifiers

Synopsis

Bool XkbLockModifiers (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 modifiers 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.

Info

libX11 1.6.4 X Version 11 XKB FUNCTIONS