Manual Pages for UNIX Operating System command usage for man XkbQueryExtension

XKB FUNCTIONS                             XkbQueryExtension(3x11)



NAME
     XkbQueryExtension  -   Determines  the  compatibility  of  a
     library at runtime.

SYNOPSIS
     cc [ flag... ] file... -lX11 [ library... ]

     Bool XkbQueryExtension (Display *dpy, int *opcode_rtrn,  int
          *event_rtrn,  int  *error_rtrn,  int *major_in_out, int
          *minor_in_out);

ARGUMENTS
     dpy  connection to the X server

     opcode_rtrn
          backfilled with the major extension opcode

     event_rtrn
          backfilled with the extension base event code

     error_rtrn
          backfilled with the extension base error code

     major_in_out
          compile time lib major version in, server major version
          out

     minor_in_out
          compile time lib min version in, server  minor  version
          out

DESCRIPTION
     Call XkbQueryExtension to check for the presence and  compa-
     tibility  of  the  extension in the server and to initialize
     the extension. Because of potential version mismatches,  you
     cannot  use  the  generic  extension  mechanism  functions (
     XQueryExtension and XInitExtension ) for  checking  for  the
     presence of, and initializing the Xkb extension.

     You must call  XkbQueryExtension  or  XkbOpenDisplay  before
     using any other Xkb library interfaces, unless such usage is
     explicitly allowed in  the  interface  description  in  this
     document.  The  exceptions  are:  XkbIgnoreExtension, XkbLi-
     braryVersion, and a handful of audible-bell  functions.  You
     should  not  use any other Xkb functions if the extension is
     not present or is uninitialized. In general,  calls  to  Xkb
     library  functions made prior to initializing the Xkb exten-
     sion cause BadAccess protocol errors.

     XkbQueryExtension both determines whether a  compatible  Xkb
     extension  is  present  in  the X server and initializes the
     extension when it is present.



X Version 11        Last change: libX11 1.3.5                   1






XKB FUNCTIONS                             XkbQueryExtension(3x11)



     The XkbQueryExtension function determines whether a compati-
     ble  version  of  the X Keyboard Extension is present in the
     server. If a compatible extension is present, XkbQueryExten-
     sion returns True; otherwise, it returns False.

     If a compatible version of Xkb is present, XkbQueryExtension
     initializes the extension. It backfills the major opcode for
     the keyboard extension in opcode_rtrn, the base  event  code
     in  event_rtrn,  the  base error code in error_rtrn, and the
     major  and  minor  version  numbers  of  the  extension   in
     major_in_out  and minor_in_out. The major opcode is reported
     in the req_major fields of some Xkb events. For a discussion
     of the base event code.

RETURN VALUES
     True           The XkbQueryExtension function  returns  True
                    if  it determines a compatible version of the
                    X  Keyboard  Extension  is  present  in   the
                    server.

     False          The XkbQueryExtension function returns  False
                    if  it determines a compatible version of the
                    X Keyboard Extension is not  present  in  the
                    server.

SEE ALSO
     XkbIgnoreExtension(3x11),           XkbLibraryVersion(3x11),
     XkbOpenDisplay(3x11)


ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | x11/library/libx11          |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | MT-Level                    | See XInitThreads(3X11)      |
    |_____________________________|_____________________________|












X Version 11        Last change: libX11 1.3.5                   2