XChangeKeyboardMapping(3) XLIB FUNCTIONS XChangeKeyboardMapping(3)NAME
XChangeKeyboardMapping, XGetKeyboardMapping, XDisplayKeycodes, XSetMod‐
ifierMapping, XGetModifierMapping, XNewModifiermap, XInsertModi‐
fiermapEntry, 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, Key‐
Code keycode_entry, int modifier);
XModifierKeymap *XDeleteModifiermapEntry(XModifierKeymap *modmap, Key‐
Code 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 speci‐
fied 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_key‐
code 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 ele‐
ments 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 Map‐
pingSuccess. 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_key‐
code 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 hard‐
ware, 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 Mapping‐
Busy, 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 modi‐
fiers. The structure should be freed after use by calling XFreeModi‐
fiermap. 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 ALSOXFree(3), XSetPointerMapping(3)
Xlib - C Language X Interface
X Version 11 libX11 1.3.6 XChangeKeyboardMapping(3)
