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X11R7.4 - man page for xkbgetkeymodifiermap (x11r4 section 3)

XkbGetKeyModifierMap(3) 			    XKB FUNCTIONS			      XkbGetKeyModifierMap(3)

XkbGetKeyModifierMap - Update the modifier map for one or more of the keys in a keyboard description
Status XkbGetKeyModifierMap ( dpy, first, num, xkb ) Display * dpy; unsigned int first; unsigned int num; XkbDescPtr xkb;
- dpy connection to X server - first keycode of first key to get - num number of keys for which information is desired - xkb keyboard description to update
The modmap entry of the client map is an array, indexed by keycode, specifying the real modifiers bound to a key. Each entry is a mask composed of a bitwise inclusive OR of the legal real modifiers: ShiftMask, LockMask, ControlMask, Mod1Mask, Mod2Mask, Mod3Mask, Mod4Mask, and Mod5Mask. If a bit is set in a modmap entry, the cor- responding key is bound to that modifier. Pressing or releasing the key bound to a modifier changes the modifier set and unset state. The particular manner in which the modifier set and unset state changes is determined by the behavior and actions assigned to the key. XkbGetKeyModifierMap sends a request to the server for the modifier mappings for num keys starting with the key whose keycode is first. It waits for a reply and places the results in the xkb->map->modmap array. If successful, XkbGetKeyModifier returns Success. If the map component of the xkb parameter has not been allocated, XkbGetKeyModifierMap allocates and initial- izes it. If a compatible version of Xkb is not available in the server or the Xkb extension has not been properly ini- tialized, XkbGetKeySyms returns BadAccess. If any allocation errors occur while obtaining the modifier map, XkbGetKeyModifierMap returns BadAlloc.
BadAccess The Xkb extension has not been properly initialized BadAlloc Unable to allocate storage X Version 11 libX11 1.2.1 XkbGetKeyModifierMap(3)

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