XkbChangeNames - Man Page

Bool XkbChangeNames (Display *dpy, unsigned int which, XkbDescPtr xkb);

dpy

connection to the X server

which

mask of names or map components to be updated

xkb

keyboard description to be updated

XkbChangeNames provides a more flexible method for changing symbolic names than XkbSetNames and requires the use of an XkbNameChangesRec structure.

XkbChangeNames copies any names specified by changes from the keyboard description, xkb, to the X server specified by dpy. XkbChangeNames aborts and returns False if any illegal type names or type shift level names are  specified by changes.

To change the symbolic names in the server, first modify a local copy of the  keyboard description and then use either XkbSetNames, or, to save network traffic, use a XkbNameChangesRec structure and call XkbChangeNames to download the changes to the server. XkbSetNames and XkbChangeNames can generate BadAlloc, BadAtom, BadLength, BadMatch, and BadImplementation  errors.

The XkbNameChangesRec allows applications to identify small modifications to the  symbolic names and  effectively reduces the amount of traffic sent to the server:

    typedef struct _XkbNameChanges {
        unsigned int   changed;            /* name components that have changed */
        unsigned char  first_type;         /* first key type with a new name */
        unsigned char  num_types;          /* number of types with new names */
        unsigned char  first_lvl;          /* first key type with new level names */
        unsigned char  num_lvls;           /* number of key types with new level names */
        unsigned char  num_aliases;        /* if key aliases changed, total number of key aliases */
        unsigned char  num_rg;             /* if radio groups changed, total number of radio groups */
        unsigned char  first_key;          /* first key with a new name */
        unsigned char  num_keys;           /* number of keys with new names */
        unsigned short changed_vmods;      /* mask of virtual modifiers for which names have changed */
        unsigned long  changed_indicators; /* mask of indicators for which names were changed */
        unsigned char  changed_groups;     /* mask of groups for which names were changed */
    } XkbNameChangesRec, *XkbNameChangesPtr

The changed field specifies the name components that have changed and is the bitwise  inclusive OR of the valid names  mask bits defined in Table 1. The rest of the fields in the structure specify  the ranges that have changed  for the various kinds of symbolic names, as shown in Table 2.

Xkb provides several functions that work with symbolic names. Each of these  functions uses a mask to  specify individual fields of the structures described above. These masks and  their relationships to the  fields in a keyboard description are shown in Table 1.

BadAlloc

Unable to allocate storage

BadAtom

A name is neither a valid Atom or None

BadImplementation

Invalid reply from server

BadLength

The length of a request is shorter or longer than that required to minimally  contain the arguments

BadMatch

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

XkbSetNames(3)

XkbChangeControls(3), XkbSetNames(3).