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.\" Copyright 1999 Oracle and/or its affiliates. All rights reserved.
.\"
.\" 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 XkbOpenDisplay __libmansuffix__ __xorgversion__ "XKB FUNCTIONS"
.SH NAME
XkbOpenDisplay \- Checks for a compatible version of the Xkb extension in both
the library and the server, and initializes the extension for use.
.SH SYNOPSIS
.HP
.B Display XkbOpenDisplay
.BI "(\^char *" "display_name" "\^,"
.BI "int *" "event_rtrn" "\^,"
.BI "int *" "error_rtrn" "\^,"
.BI "int *" "major_in_out" "\^,"
.BI "int *" "minor_in_out" "\^,"
.BI "int *" "reason_rtrn" "\^);"
.if n .ti +5n
.if t .ti +.5i
.SH ARGUMENTS
.TP
.I display_name
hardware display name, which determines the display and communications domain to
be used
.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
.TP
.I reason_rtrn
backfilled with a status code
.SH DESCRIPTION
.LP
As a convenience, you can use the function
.I XkbOpenDisplay
to perform these three
tasks at once: open a connection to an X server, check for a compatible version
of the Xkb extension in both the library and the server, and initialize the
extension for use.
.I XkbOpenDisplay
is a convenience function that opens an X display connection and
initializes the X keyboard extension. In all cases, upon return
.I reason_rtrn
contains a status value indicating success or the type of failure. If
.I major_in_out
and
.I minor_in_out
are not NULL,
.I XkbOpenDisplay
first calls
.I XkbLibraryVersion
to determine whether the client library is compatible, passing
it the values pointed to by
.I major_in_out and
.I minor_in_out. If the library is
incompatible,
.I XkbOpenDisplay backfills
.I major_in_out
and
.I minor_in_out
with the
major and minor extension versions of the library being used and returns NULL.
If the library is compatible,
.I XkbOpenDisplay
next calls
.I XOpenDisplay
with the
.I display_name.
If this fails, the function returns NULL. If successful,
.I XkbOpenDisplay
calls
.I XkbQueryExtension
and backfills the major and minor Xkb
server extension version numbers in
.I major_in_out and
.I minor_in_out. If the server
extension version is not compatible with the library extension version or if the
server extension is not present,
.I XkbOpenDisplay
closes the display and returns
NULL. When successful, the function returns the display connection.
The possible values for reason_rtrn are:
.IP \(bu 5
XkbOD_BadLibraryVersion indicates XkbLibraryVersion returned False.
.IP \(bu 5
XkbOD_ConnectionRefused indicates the display could not be opened.
.IP \(bu 5
XkbOD_BadServerVersion indicates the library and the server have incompatible
extension versions.
.IP \(bu 5
XkbOD_NonXkbServer indicates the extension is not present in the X server.
.IP \(bu 5
XkbOD_Success indicates that the function succeeded.
.SH "RETURN VALUES"
.TP 15
NULL
The
.I XkbOpenDisplay
function returns NULL if the library is incompatible.
.sp
.in 20
The
.I XkbOpenDisplay
function returns NULL if the call to
.I XOpenDisplay
with the
.I display_name
fails.
.sp
.in 20
The
.I XkbOpenDisplay
function returns NULL and closes the display if the server extension version is not
compatible with the library extension version or if the server extension is not present.
.SH DIAGNOSTICS
.TP 15
.SM BadAccess
The Xkb extension has not been properly initialized
.SH "SEE ALSO"
.BR XkbLibraryVersion (__libmansuffix__),
.BR XkbQueryExtension (__libmansuffix__),
.BR XOpenDisplay (__libmansuffix__)
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