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CentOS 7.0 - man page for xkbgetkeymodifiermap (centos section 3)

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XkbGetKeyModifierMap(3) 		  XKB FUNCTIONS 		  XkbGetKeyModifierMap(3)

       XkbGetKeyModifierMap  -	Update the modifier map for one or more of the keys in a keyboard

       Status XkbGetKeyModifierMap (Display *dpy, unsigned int first, unsigned	int  num,  XkbDe-
	      scPtr 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 corresponding 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  deter-
       mined 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 initializes it.

       If a compatible version of Xkb is not available in the server or the Xkb extension has not
       been properly initialized, 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 1.6.0 		  XkbGetKeyModifierMap(3)
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