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CentOS 7.0 - man page for xkbchangenames (centos section 3)

XkbChangeNames(3)			  XKB FUNCTIONS 			XkbChangeNames(3)

       XkbChangeNames - _summary-line_

       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 XkbSet-
       Names 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 Xkb-
       NameChangesRec 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.

				 Table 1 Symbolic Names Masks
       Mask Bit 		Value	   Keyboard	Field
       XkbKeycodesNameMask	(1<<0)	   Xkb->names	keycodes
       XkbGeometryNameMask	(1<<1)	   Xkb->names	geometry
       XkbSymbolsNameMask	(1<<2)	   Xkb->names	symbols
       XkbPhysSymbolsNameMask	(1<<3)	   Xkb->names	phys_symbols
       XkbTypesNameMask 	(1<<4)	   Xkb->names	type
       XkbCompatNameMask	(1<<5)	   Xkb->names	compat
       XkbKeyTypeNamesMask	(1<<6)	   Xkb->map	type[*].name
       XkbKTLevelNamesMask	(1<<7)	   Xkb->map	type[*].lvl_names[*]
       XkbIndicatorNamesMask	(1<<8)	   Xkb->names	indicators[*]
       XkbKeyNamesMask		(1<<9)	   Xkb->names	keys[*], num_keys
       XkbKeyAliasesMask	(1<<10)    Xkb->names	key_aliases[*], num_key_aliases
       XkbVirtualModNamesMask	(1<<11)    Xkb->names	vmods[*]
       XkbGroupNamesMask	(1<<12)    Xkb->names	groups[*]
       XkbRGNamesMask		(1<<13)    Xkb->names	radio_groups[*], num_rg
       XkbComponentNamesMask	(0x3f)	   Xkb->names	keycodes,
							physical symbols,
							types, and
							compatibility map
       XkbAllNamesMask		(0x3fff)   Xkb->names	all name components

				Table 2 XkbNameChanges Fields
       Mask			Fields		     Component	  Field
       XkbKeyTypeNamesMask	first_type,	     Xkb->map	  type[*].name
       XkbKTLevelNamesMask	first_lvl,	     Xkb->map	  type[*].lvl_names[*]
       XkbKeyAliasesMask	num_aliases	     Xkb->names   key_aliases[*]
       XkbRGNamesMask		num_rg		     Xkb->names   radio_groups[*]
       XkbKeyNamesMask		first_key,	     Xkb->names   keys[*]
       XkbVirtualModNamesMask	changed_vmods	     Xkb->names   vmods[*]
       XkbIndicatorNamesMask	changed_indicators   Xkb->names   indicators[*]
       XkbGroupNamesMask	changed_groups	     Xkb->names   groups[*]

       BadAlloc       Unable to allocate storage

       BadAtom	      A name is neither a valid Atom or None

		      Invalid reply from server

       BadLength      The length of a request is shorter or longer than that  required	to  mini-
		      mally 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


X Version 11				   libX11 1.6.0 			XkbChangeNames(3)

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