XkbAllocControls - Man Page

Status XkbAllocControls (XkbDescPtr xkb, unsigned int which);

xkb

Xkb description in which to allocate ctrls rec

which

mask of components of ctrls to allocate

The need to allocate an XkbControlsRec structure seldom arises; Xkb creates one  when an application calls XkbGetControls or a related function. For those situations where there is not an XkbControlsRec  structure allocated in the XkbDescRec, allocate one by calling XkbAllocControls.

XkbAllocControls allocates the ctrls field of the xkb parameter, initializes all fields to zero, and returns Success. If the ctrls field is not NULL, XkbAllocControls simply returns Success. If xkb is NULL, XkbAllocControls reports a BadMatch error. If the ctrls field could not be allocated, it reports a BadAlloc error.

The which mask specifies the individual fields of the ctrls structure to be allocated and can contain any of the valid masks defined in  Table 1.  (SHOULD THIS COMMENT BE LEFT IN????) Because none of the currently existing controls have any structures associated  with them, which is currently of little practical value in this call.

Table 1 shows the actual values for the individual mask bits used to select  controls for  modification and to enable and disable the control. Note that the same mask bit  is used to  specify general modifications to the parameters used to configure the control  (which), and to  enable and disable the control (enabled_ctrls). The anomalies in the table (no  "ok" in column)  are for controls that have no configurable attributes; and for controls that are  not boolean  controls and therefore cannot be enabled or disabled.

SUCCESS

allocates the ctrls field of the xkb parameter, initializes all fields to zero

the ctrls field is not NULL

BadAlloc

Unable to allocate storage

BadMatch

A compatible version of Xkb was not available in the server or an argument has  correct type and range, but is otherwise invalid

XkbGetControls(3)