NAME XChangeKeyboardMapping, XGetKeyboardMapping, XDisplayKeycodes, XSetMod‐ ifierMapping, XGetModifierMapping, XNewModifiermap, XInsertModi‐ fiermapEntry, XDeleteModifiermapEntry, XFreeModifiermap, XModi‐
fierKeymap - manipulate keyboard encoding and keyboard encoding struc‐ ture SYNTAX int XChangeKeyboardMapping(Display *display, int firstkeycode, int keysymsperkeycode, KeySym *keysyms, int numcodes); KeySym *XGetKeyboardMapping(Display *display, KeyCode firstkeycode, int keycodecount, int *keysymsperkeycodereturn); int XDisplayKeycodes(Display *display, int *minkeycodesreturn, int *maxkeycodesreturn); int XSetModifierMapping(Display *display, XModifierKeymap *modmap); XModifierKeymap *XGetModifierMapping(Display *display); XModifierKeymap *XNewModifiermap(int maxkeyspermod); XModifierKeymap *XInsertModifiermapEntry(XModifierKeymap *modmap, Key‐ Code keycodeentry, int modifier); XModifierKeymap *XDeleteModifiermapEntry(XModifierKeymap *modmap, Key‐ Code keycodeentry, int modifier); int XFreeModifiermap(XModifierKeymap *modmap); ARGUMENTS display Specifies the connection to the X server. firstkeycode Specifies the first KeyCode that is to be changed or returned. keycodecount Specifies the number of KeyCodes that are to be returned. keycodeentry Specifies the KeyCode. keysyms Specifies an array of KeySyms. keysymsperkeycode Specifies the number of KeySyms per KeyCode. keysymsperkeycodereturn Returns the number of KeySyms per KeyCode. maxkeyspermod Specifies the number of KeyCode entries preallocated to the modifiers in the map. maxkeycodesreturn Returns the maximum number of KeyCodes. minkeycodesreturn Returns the minimum number of KeyCodes. modifier Specifies the modifier. modmap Specifies the XModifierKeymap structure. numcodes 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 firstkeycode. The symbols for KeyCodes outside this range remain unchanged. The number of elements in keysyms must be: numcodes * keysymsperkeycode The specified firstkeycode must be greater than or equal to minkey‐ code returned by XDisplayKeycodes, or a BadValue error results. In addition, the following expression must be less than or equal to maxkeycode as returned by XDisplayKeycodes, or a BadValue error results:
firstkeycode + numcodes - 1 KeySym number N, counting from zero, for KeyCode K has the following index in keysyms, counting from zero:
(K - firstkeycode) * keysymsperkeycode + N The specified keysymsperkeycode 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 firstkeycode. The value specified in firstkeycode must be greater than or equal to minkeycode as returned by XDisplayKeycodes, or a BadValue error results. In addition, the following expression must be less than or equal to maxkeycode as returned by XDisplayKeycodes:
firstkeycode + keycodecount - 1 If this is not the case, a BadValue error results. The number of ele‐ ments in the KeySyms list is: keycodecount * keysymsperkeycodereturn KeySym number N, counting from zero, for KeyCode K has the following index in the list, counting from zero:
(K - firstcode) * keysymspercodereturn + N The X server arbitrarily chooses the keysymsperkeycodereturn 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 maxkeypermod 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 minkey‐ code and maxkeycode 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 maxkeypermod; /* This server's max number of keys per modifier */ KeyCode *modifiermap; /* An 8 by maxkeypermod 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 X Version 11 libX11 1.6.5 XChangeKeyboardMapping(3)