Provided by: libx11-doc_1.8.1-2_all 
NAME
XChangeKeyboardMapping, XGetKeyboardMapping, XDisplayKeycodes, XSetModifierMapping,
XGetModifierMapping, XNewModifiermap, XInsertModifiermapEntry, XDeleteModifiermapEntry,
XFreeModifiermap, XModifierKeymap - manipulate keyboard encoding and keyboard encoding
structure
SYNTAX
int XChangeKeyboardMapping(Display *display, int first_keycode, int keysyms_per_keycode,
KeySym *keysyms, int num_codes);
KeySym *XGetKeyboardMapping(Display *display, KeyCode first_keycode, int keycode_count,
int *keysyms_per_keycode_return);
int XDisplayKeycodes(Display *display, int *min_keycodes_return, int
*max_keycodes_return);
int XSetModifierMapping(Display *display, XModifierKeymap *modmap);
XModifierKeymap *XGetModifierMapping(Display *display);
XModifierKeymap *XNewModifiermap(int max_keys_per_mod);
XModifierKeymap *XInsertModifiermapEntry(XModifierKeymap *modmap, KeyCode keycode_entry,
int modifier);
XModifierKeymap *XDeleteModifiermapEntry(XModifierKeymap *modmap, KeyCode keycode_entry,
int modifier);
int XFreeModifiermap(XModifierKeymap *modmap);
ARGUMENTS
display Specifies the connection to the X server.
first_keycode
Specifies the first KeyCode that is to be changed or returned.
keycode_count
Specifies the number of KeyCodes that are to be returned.
keycode_entry
Specifies the KeyCode.
keysyms Specifies an array of KeySyms.
keysyms_per_keycode
Specifies the number of KeySyms per KeyCode.
keysyms_per_keycode_return
Returns the number of KeySyms per KeyCode.
max_keys_per_mod
Specifies the number of KeyCode entries preallocated to the modifiers in the
map.
max_keycodes_return
Returns the maximum number of KeyCodes.
min_keycodes_return
Returns the minimum number of KeyCodes.
modifier Specifies the modifier.
modmap Specifies the XModifierKeymap structure.
num_codes Specifies the number of KeyCodes that are to be changed.
DESCRIPTION
The XChangeKeyboardMapping function defines the symbols for the specified number of
KeyCodes starting with first_keycode. The symbols for KeyCodes outside this range remain
unchanged. The number of elements in keysyms must be:
num_codes * keysyms_per_keycode
The specified first_keycode must be greater than or equal to min_keycode returned by
XDisplayKeycodes, or a BadValue error results. In addition, the following expression must
be less than or equal to max_keycode as returned by XDisplayKeycodes, or a BadValue error
results:
first_keycode + num_codes - 1
KeySym number N, counting from zero, for KeyCode K has the following index in keysyms,
counting from zero:
(K - first_keycode) * keysyms_per_keycode + N
The specified keysyms_per_keycode can be chosen arbitrarily by the client to be large
enough to hold all desired symbols. A special KeySym value of NoSymbol should be used to
fill in unused elements for individual KeyCodes. It is legal for NoSymbol to appear in
nontrailing positions of the effective list for a KeyCode. XChangeKeyboardMapping
generates a MappingNotify event.
There is no requirement that the X server interpret this mapping. It is merely stored for
reading and writing by clients.
XChangeKeyboardMapping can generate BadAlloc and BadValue errors.
The XGetKeyboardMapping function returns the symbols for the specified number of KeyCodes
starting with first_keycode. The value specified in first_keycode must be greater than or
equal to min_keycode as returned by XDisplayKeycodes, or a BadValue error results. In
addition, the following expression must be less than or equal to max_keycode as returned
by XDisplayKeycodes:
first_keycode + keycode_count - 1
If this is not the case, a BadValue error results. The number of elements in the KeySyms
list is:
keycode_count * keysyms_per_keycode_return
KeySym number N, counting from zero, for KeyCode K has the following index in the list,
counting from zero:
(K - first_code) * keysyms_per_code_return + N
The X server arbitrarily chooses the keysyms_per_keycode_return value to be large enough
to report all requested symbols. A special KeySym value of NoSymbol is used to fill in
unused elements for individual KeyCodes. To free the storage returned by
XGetKeyboardMapping, use XFree.
XGetKeyboardMapping can generate a BadValue error.
The XDisplayKeycodes function returns the min-keycodes and max-keycodes supported by the
specified display. The minimum number of KeyCodes returned is never less than 8, and the
maximum number of KeyCodes returned is never greater than 255. Not all KeyCodes in this
range are required to have corresponding keys.
The XSetModifierMapping function specifies the KeyCodes of the keys (if any) that are to
be used as modifiers. If it succeeds, the X server generates a MappingNotify event, and
XSetModifierMapping returns MappingSuccess. X permits at most 8 modifier keys. If more
than 8 are specified in the XModifierKeymap structure, a BadLength error results.
The modifiermap member of the XModifierKeymap structure contains 8 sets of max_keypermod
KeyCodes, one for each modifier in the order Shift, Lock, Control, Mod1, Mod2, Mod3, Mod4,
and Mod5. Only nonzero KeyCodes have meaning in each set, and zero KeyCodes are ignored.
In addition, all of the nonzero KeyCodes must be in the range specified by min_keycode and
max_keycode in the Display structure, or a BadValue error results.
An X server can impose restrictions on how modifiers can be changed, for example, if
certain keys do not generate up transitions in hardware, if auto-repeat cannot be disabled
on certain keys, or if multiple modifier keys are not supported. If some such restriction
is violated, the status reply is MappingFailed, and none of the modifiers are changed. If
the new KeyCodes specified for a modifier differ from those currently defined and any
(current or new) keys for that modifier are in the logically down state,
XSetModifierMapping returns MappingBusy, and none of the modifiers is changed.
XSetModifierMapping can generate BadAlloc and BadValue errors.
The XGetModifierMapping function returns a pointer to a newly created XModifierKeymap
structure that contains the keys being used as modifiers. The structure should be freed
after use by calling XFreeModifiermap. If only zero values appear in the set for any
modifier, that modifier is disabled.
The XNewModifiermap function returns a pointer to XModifierKeymap structure for later use.
The XInsertModifiermapEntry function adds the specified KeyCode to the set that controls
the specified modifier and returns the resulting XModifierKeymap structure (expanded as
needed).
The XDeleteModifiermapEntry function deletes the specified KeyCode from the set that
controls the specified modifier and returns a pointer to the resulting XModifierKeymap
structure.
The XFreeModifiermap function frees the specified XModifierKeymap structure.
STRUCTURES
The XModifierKeymap structure contains:
typedef struct {
int max_keypermod; /* This server's max number of keys per modifier */
KeyCode *modifiermap; /* An 8 by max_keypermod array of the modifiers */
} XModifierKeymap;
DIAGNOSTICS
BadAlloc The server failed to allocate the requested resource or server memory.
BadValue Some numeric value falls outside the range of values accepted by the request.
Unless a specific range is specified for an argument, the full range defined by
the argument's type is accepted. Any argument defined as a set of alternatives
can generate this error.
SEE ALSO
XFree(3), XkbGetMap(3), XSetPointerMapping(3)
Xlib - C Language X Interface