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

XkbListComponents(3)			  XKB FUNCTIONS 		     XkbListComponents(3)

       XkbListComponents - List of components for one or more component types

       XkbComponentListPtr  XkbListComponents  (Display *dpy, unsigned int device_spec, XkbCompo-
	      nentNamesPtr ptrns, int *max_inout);

       - dpy  connection to X server

       - device_spec
	      device ID, or XkbUseCoreKbd

       - ptrns
	      namelist for components of interest

       - max_inout
	      max # returned names, # left over

       You may ask the server for a list of components for  one  or  more  component  types.  The
       request	takes the form of a set of patterns, one pattern for each of the component types,
       including a pattern for the complete keyboard description. To obtain this list,	use  Xkb-

       XkbListComponents  queries  the server for a list of component names matching the patterns
       specified in ptrns.  It waits for a reply and returns the matching component names  in  an
       XkbComponentListRec  structure.	When you are done using the structure, you should free it
       using XkbFreeComponentList. device_spec indicates a particular device in which the  caller
       is interested. A server is allowed (but not required) to restrict its reply to portions of
       the database that are relevant for that particular device.

       ptrns is a pointer to an XkbComponentNamesRec. Each of the fields in ptrns contains a pat-
       tern  naming  the  components  of interest. Each of the patterns is composed of characters
       from the ISO Latin1 encoding, but can contain only parentheses,	the  wildcard  characters
       `?'  and  `*', and characters permitted in a component class or member name. A pattern may
       be NULL, in which case no components for that type is returned. Pattern matches with  com-
       ponent  names are case sensitive. The `?'  wildcard matches any single character, except a
       left or right parenthesis; the `*' wildcard matches any number  of  characters,	except	a
       left  or  right parenthesis. If an implementation allows additional characters in a compo-
       nent class or member name other than those required by the Xkb extension,  the  result  of
       comparing  one of the additional characters to either of the wildcard characters is imple-

       If a pattern contains illegal characters, the illegal characters are ignored. The matching
       process is carried out as if the illegal characters were omitted from the pattern.

       max_inout  is used to throttle the amount of data passed to and from the server. On input,
       it specifies the maximum number of names to be returned (the total number of names in  all
       component  categories).	Upon return from XkbListComponents, max_inout contains the number
       of names that matched the request but were not returned because of the limit.

       Component Names

       Component names have the form class(member) where class describes a subset of  the  avail-
       able components for a particular type and the optional member identifies a specific compo-
       nent from that subset. For example, the name  "atlantis(acme)"  for  a  symbols	component
       might  specify  the  symbols  used for the atlantis national keyboard layout by the vendor
       "acme." Each class has an optional default member - references that specify  a  class  but
       not  a  member refer to the default member of the class, if one exists. Xkb places no con-
       straints on the interpretation of the class and member names used in component names.

       The class and member names are both specified using characters from the Latin-1	character
       set.  Xkb  implementations must accept all alphanumeric characters, minus (`-') and under-
       score (`_') in class or member names, and must not accept parentheses, plus, vertical bar,
       percent	sign,  asterisk,  question  mark,  or white space. The use of other characters is

       The component name patterns used to describe the request are passed  to	XkbListComponents
       using  an  XkbComponentNamesRec	structure.  This structure has no special allocation con-
       straints or interrelationships with other structures; allocate  and  free  this	structure
       using standard malloc and free calls or their equivalent:

	   typedef struct _XkbComponentNames {
	       char *	      keymap;		/* keymap names */
	       char *	      keycodes; 	/* keycode names */
	       char *	      types;		/* type names */
	       char *	      compat;		/* compatibility map names */
	       char *	      symbols;		/* symbol names */
	       char *	      geometry; 	/* geometry names */
	   } XkbComponentNamesRec, *XkbComponentNamesPtr;

       XkbListComponents returns a pointer to an XkbComponentListRec:

	   typedef struct _XkbComponentList {
	       int			num_keymaps;  /* number of entries in keymap */
	       int			num_keycodes; /* number of entries in keycodes */
	       int			num_types;    /* number of entries in types */
	       int			num_compat;   /* number of entries in compat */
	       int			num_symbols;  /* number of entries in symbols */
	       int			num_geometry; /* number of entries in geometry;
	       XkbComponentNamePtr	keymap;       /* keymap names */
	       XkbComponentNamePtr	keycodes;     /* keycode names */
	       XkbComponentNamePtr	types;	      /* type names */
	       XkbComponentNamePtr	compat;       /* compatibility map names */
	       XkbComponentNamePtr	symbols;      /* symbol names */
	       XkbComponentNamePtr	geometry;     /* geometry names */
	   } XkbComponentListRec, *XkbComponentListPtr;

	   typedef struct _XkbComponentName {
	       unsigned short		flags;	      /* hints regarding component name */
	       char *			name;	      /* name of component */
	   } XkbComponentNameRec, *XkbComponentNamePtr;


       Note  that the structure used to specify patterns on input is an XkbComponentNamesRec, and
       that used to hold the individual component names upon return is an XkbComponentNameRec (no
       trailing `s' in Name).

X Version 11				   libX11 1.6.0 		     XkbListComponents(3)

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