XkbAllocClientMap man page

XkbAllocClientMap — Allocate and initialize an empty client map description  record


Status XkbAllocClientMap (XkbDescPtr xkb, unsigned int which, unsigned int type_count);


- xkb

keyboard description in which to allocate client map

- which

mask selecting map components to allocate

- type_count

value of num_types field in map to be allocated


Calling XkbGetMap should be sufficient for most applications to get client and server maps. As a  result, most applications do not need to directly allocate client and server  maps.

If you change the number of key types or construct map components without  loading the necessary components from the X server, do not allocate any map  components directly using malloc or Xmalloc. Instead, use the Xkb allocators, XkbAllocClientMap, and XkbAllocServerMap.

Similarly, use the Xkb destructors, XkbFreeClientMap, and XkbFreeServerMap instead of free or Xfree.

XkbAllocClientMap allocates and initializes an empty client map in the map field of the keyboard description specified by xkb. The which parameter specifies the particular components of the client map structure to  allocate and is a mask composed by a bitwise inclusive OR of one or more of the  masks shown in Table 1.

Table 1 XkbAllocClientMap Masks
Mask Effect
XkbKeyTypesMask The type_count field specifies the number of entries to preallocate for the  types field of the client map. If the type_count field is less than  XkbNumRequiredTypes returns BadValue.
XkbKeySymsMask The min_key_code and max_key_code fields of the xkb parameter are used to  allocate the syms and key_sym_map fields of the client map. The fields are  allocated to contain the maximum number of entries necessary for max_key_code -  min_key_code + 1 keys.
XkbModifierMapMask The min_key_code and max_key_code fields of the xkb parameter are used to  allocate the modmap field of the client map. The field is allocated to contain  the maximum number of entries necessary for max_key_code - min_key_code + 1  keys.

NOTE: The min_key_code and max_key_code fields of the xkb parameter must be legal values if the XkbKeySymsMask or XkbModifierMapMask masks  are set in the which parameter. If they are not valid, XkbAllocClientMap returns BadValue.

If the client map of the keyboard description is not NULL, and any fields are  already allocated in the client map, XkbAllocClientMap does not overwrite the existing values; it simply ignores that part of the  request. The only exception is the types array. If type_count is greater than the current num_types field of the client map, XkbAllocClientMap resizes the types array and resets the num_types field accordingly.

If XkbAllocClientMap is successful, it returns Success. Otherwise, it can return either BadMatch,  BadAlloc, or BadValue errors.



Unable to allocate storage


A compatible version of Xkb was not available in the server or an argument has  correct type and range, but is otherwise invalid


An argument is out of range

See Also

XkbAllocClientMap(3), XkbAllocServerMap(3), XkbFreeClientMap,(3), XkbFreeServerMap(3), XkbGetMap(3)

Referenced By


libX11 1.6.5 X Version 11 XKB FUNCTIONS