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