XChangeKeyboardMapping(3X1XLIB FUNCTIXChangeKeyboardMapping(3X11)NAME
XChangeKeyboardMapping, XGetKeyboardMapping, XDisplayKey-
codes, XSetModifierMapping, XGetModifierMapping, XNewModi-
fiermap, XInsertModifiermapEntry, XDeleteModifiermapEntry,
XFreeModifierMap XModifierKeymap - manipulate keyboard
encoding and keyboard encoding structure
SYNTAX
XChangeKeyboardMapping(display, first_keycode,
keysyms_per_keycode, keysyms, num_codes)
Display *display;
int first_keycode;
int keysyms_per_keycode;
KeySym *keysyms;
int num_codes;
KeySym *XGetKeyboardMapping(display, first_keycode, key-
code_count,
keysyms_per_keycode_return)
Display *display;
KeyCode first_keycode;
int keycode_count;
int *keysyms_per_keycode_return;
XDisplayKeycodes(display, min_keycodes_return,
max_keycodes_return)
Display *display;
int *min_keycodes_return, *max_keycodes_return;
int XSetModifierMapping(display, modmap)
Display *display;
XModifierKeymap *modmap;
XModifierKeymap *XGetModifierMapping(display)
Display *display;
XModifierKeymap *XNewModifiermap(max_keys_per_mod)
int max_keys_per_mod;
XModifierKeymap *XInsertModifiermapEntry(modmap, key-
code_entry, modifier)
XModifierKeymap *modmap;
KeyCode keycode_entry;
int modifier;
XModifierKeymap *XDeleteModifiermapEntry(modmap, key-
code_entry, modifier)
XModifierKeymap *modmap;
KeyCode keycode_entry;
int modifier;
XFreeModifiermap(modmap)
XModifierKeymap *modmap;
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XChangeKeyboardMapping(3X1XLIB FUNCTIXChangeKeyboardMapping(3X11)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 preallo-
cated 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:
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XChangeKeyboardMapping(3X1XLIB FUNCTIXChangeKeyboardMapping(3X11)
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 arbitrar-
ily 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 posi-
tions of the effective list for a KeyCode. XChangeKey-
boardMapping 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_key-
code. 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 addi-
tion, 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_key-
code_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 min-
imum number of KeyCodes returned is never less than 8, and
the maximum number of KeyCodes returned is never greater
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XChangeKeyboardMapping(3X1XLIB FUNCTIXChangeKeyboardMapping(3X11)
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 dis-
abled 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 XModi-
fierKeymap 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.
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XChangeKeyboardMapping(3X1XLIB FUNCTIXChangeKeyboardMapping(3X11)
The XFreeModifiermap function frees the specified XModi-
fierKeymap 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 spe-
cific 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(3X11), XSetPointerMapping(3X11)
Xlib - C Language X Interface
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