XkbFreeClientMap(3)
NAME
XkbFreeClientMap - Free memory used by the client map member of an XkbDescRec structure
SYNOPSIS
void XkbFreeClientMap (XkbDescPtr xkb, unsigned int which, Bool
free_all);
ARGUMENTS
- xkb keyboard description containing client map to free
- which
mask identifying components of map to free
- free_all
True => free all client components and map itself
DESCRIPTION
XkbFreeClientMap frees the components of client map specified by which
in the XkbDescRec structure specified by the xkb parameter and sets the
corresponding structure component values to NULL. The which parameter
specifies a combination of the client map masks shown in Table 1.
If free_all is True, which is ignored; XkbFreeClientMap frees every
non-NULL structure component in the client map, frees the
XkbClientMapRec structure referenced by the map member of the xkb
parameter, and sets the map member to NULL.
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.
STRUCTURES
The complete description of an Xkb keyboard is given by an XkbDescRec.
The component structures in the XkbDescRec represent the major Xkb
components.
typedef struct {
struct _XDisplay * display; / connection to X server */
unsigned short flags; / private to Xkb, do not modify */
unsigned short device_spec; / device of interest */
KeyCode min_key_code; / minimum keycode for device */
KeyCode max_key_code; / maximum keycode for device */
XkbControlsPtr ctrls; / controls */
XkbServerMapPtr server; / server keymap */
XkbClientMapPtr map; / client keymap */
XkbIndicatorPtr indicators; / indicator map */
XkbNamesPtr names; / names for all components */
XkbCompatMapPtr compat; / compatibility map */
XkbGeometryPtr geom; / physical geometry of keyboard */
} XkbDescRec, *XkbDescPtr;
The display field points to an X display structure. The flags field is
private to the library: modifying flags may yield unpredictable
results. The device_spec field specifies the device identifier of the
keyboard input device, or XkbUseCoreKeyboard, which specifies the core
keyboard device. The min_key_code and max_key_code fields specify the
least and greatest keycode that can be returned by the keyboard.
Each structure component has a corresponding mask bit that is used in
function calls to indicate that the structure should be manipulated in
some manner, such as allocating it or freeing it. These masks and their
relationships to the fields in the XkbDescRec are shown in Table 2.
Table 2 Mask Bits for XkbDescRec
Mask Bit XkbDescRec Field Value
XkbControlsMask ctrls (1L<<0)
XkbServerMapMask server (1L<<1)
XkbIClientMapMask map (1L<<2)
XkbIndicatorMapMask indicators (1L<<3)
XkbNamesMask names (1L<<4)
XkbCompatMapMask compat (1L<<5)
XkbGeometryMask geom (1L<<6)
XkbAllComponentsMask All Fields (0x7f)
The map field of the complete Xkb keyboard description is a pointer to
the Xkb client map, which is of type XkbClientMapRec:
typedef struct { / Client Map */
unsigned char size_types; / # occupied entries in types */
unsigned char num_types; / # entries in types */
XkbKeyTypePtr types; / vector of key types used by this keymap */
unsigned short size_syms; / length of the syms array */
unsigned short num_syms; / # entries in syms */
KeySym * syms; / linear 2d tables of keysyms, 1 per key */
XkbSymMapPtr key_sym_map; / 1 per keycode, maps keycode to syms */
unsigned char * modmap; / 1 per keycode, real mods bound to key */
} XkbClientMapRec, *XkbClientMapPtr;
DIAGNOSTICS
BadValue An argument is out of range
SEE ALSO
XkbAllocClientMap(3)
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
