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.\" Copyright (c) 1999, Oracle and/or its affiliates.
.\"
.\" Permission is hereby granted, free of charge, to any person obtaining a
.\" copy of this software and associated documentation files (the "Software"),
.\" to deal in the Software without restriction, including without limitation
.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
.\" and/or sell copies of the Software, and to permit persons to whom the
.\" Software is furnished to do so, subject to the following conditions:
.\"
.\" The above copyright notice and this permission notice (including the next
.\" paragraph) shall be included in all copies or substantial portions of the
.\" Software.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
.\" THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
.\" LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
.\" FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
.\" DEALINGS IN THE SOFTWARE.
.\"
.TH XkbQueryExtension __libmansuffix__ __xorgversion__ "XKB FUNCTIONS"
.SH NAME
XkbQueryExtension \- Determines the compatibility of a library at runtime.
.SH SYNOPSIS
.HP
.B Bool XkbQueryExtension
.BI "(\^Display *" "dpy" "\^,"
.BI "int *" "opcode_rtrn" "\^,"
.BI "int *" "event_rtrn" "\^,"
.BI "int *" "error_rtrn" "\^,"
.BI "int *" "major_in_out" "\^,"
.BI "int *" "minor_in_out" "\^);"
.if n .ti +5n
.if t .ti +.5i
.SH ARGUMENTS
.TP
.I dpy
connection to the X server
.TP
.I opcode_rtrn
backfilled with the major extension opcode
.TP
.I event_rtrn
backfilled with the extension base event code
.TP
.I error_rtrn
backfilled with the extension base error code
.TP
.I major_in_out
compile time lib major version in, server major version out
.TP
.I minor_in_out
compile time lib min version in, server minor version out
.SH DESCRIPTION
.LP
Call
.I XkbQueryExtension
to check for the presence and compatibility of the
extension in the server and to initialize the extension. Because of potential
version mismatches, you cannot use the generic extension mechanism functions
(
.I XQueryExtension
and
.I XInitExtension
) for checking for the presence of, and
initializing the Xkb extension.
You must call
.I XkbQueryExtension
or
.I XkbOpenDisplay
before using any other Xkb
library interfaces, unless such usage is explicitly allowed in the interface
description in this document. The exceptions are:
.I XkbIgnoreExtension, XkbLibraryVersion,
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
extension cause BadAccess protocol errors.
.I XkbQueryExtension
both determines whether a compatible Xkb extension is present
in the X server and initializes the extension when it is present.
The
.I XkbQueryExtension
function determines whether a compatible version of the X
Keyboard Extension is present in the server. If a compatible extension is
present,
.I XkbQueryExtension
returns True; otherwise, it returns False.
If a compatible version of Xkb is present,
.I XkbQueryExtension
initializes the
extension. It backfills the major opcode for the keyboard extension in
.I opcode_rtrn,
the base event code in
.I event_rtrn,
the base error code in
.I error_rtrn,
and the major and minor version numbers of the extension in
.I major_in_out
and
.I minor_in_out.
The major opcode is reported in the
.I req_major
fields of some Xkb events. For a discussion of the base event code.
.SH "RETURN VALUES"
.TP 15
True
The
.I XkbQueryExtension
function returns True if it determines a compatible version of the X
Keyboard Extension is present in the server.
.TP 15
False
The
.I XkbQueryExtension
function returns False if it determines a compatible version of the X
Keyboard Extension is not present in the server.
.SH "SEE ALSO"
.BR XkbIgnoreExtension (__libmansuffix__),
.BR XkbLibraryVersion (__libmansuffix__),
.BR XkbOpenDisplay (__libmansuffix__)
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