.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
.\"
.\" 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
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.\" 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 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 X CONSORTIUM 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.
.\"
.\" Except as contained in this notice, the name of the X Consortium shall
.\" not be used in advertising or otherwise to promote the sale, use or
.\" other dealings in this Software without prior written authorization
.\" from the X Consortium.
.\"
.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
.\" Digital Equipment Corporation
.\"
.\" Portions Copyright \(co 1990, 1991 by
.\" Tektronix, Inc.
.\"
.\" Permission to use, copy, modify and distribute this documentation for
.\" any purpose and without fee is hereby granted, provided that the above
.\" copyright notice appears in all copies and that both that copyright notice
.\" and this permission notice appear in all copies, and that the names of
.\" Digital and Tektronix not be used in in advertising or publicity pertaining
.\" to this documentation without specific, written prior permission.
.\" Digital and Tektronix makes no representations about the suitability
.\" of this documentation for any purpose.
.\" It is provided ``as is'' without express or implied warranty.
.\"
.\" $XFree86: xc/doc/man/X11/XOpDsply.man,v 1.2 2001/01/27 18:20:01 dawes Exp $
.\"
.ds xT X Toolkit Intrinsics \- C Language Interface
.ds xW Athena X Widgets \- C Language X Toolkit Interface
.ds xL Xlib \- C Language X Interface
.ds xC Inter-Client Communication Conventions Manual
.na
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.TH XOpenDisplay __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
.SH NAME
XOpenDisplay, XCloseDisplay \- connect or disconnect to X server
.SH SYNTAX
.HP
Display *XOpenDisplay\^(\^char *\fIdisplay_name\fP\^);
.HP
int XCloseDisplay\^(Display *\fIdisplay\fP\^);
.SH ARGUMENTS
.IP \fIdisplay\fP 1i
Specifies the connection to the X server.
.IP \fIdisplay_name\fP 1i
Specifies the hardware display name, which determines the display
and communications domain to be used.
On a POSIX-conformant system, if the display_name is NULL,
it defaults to the value of the DISPLAY environment variable.
.IN "Environment" "DISPLAY"
.SH DESCRIPTION
The
.ZN XOpenDisplay
function returns a
.ZN Display
structure that serves as the
connection to the X server and that contains all the information
about that X server.
.ZN XOpenDisplay
connects your application to the X server through TCP
or DECnet communications protocols,
or through some local inter-process communication protocol.
.IN "Protocol" "TCP"
.IN "Protocol" "DECnet"
If the hostname is a host machine name and a single colon (:)
separates the hostname and display number,
.ZN XOpenDisplay
connects using TCP streams.
If the hostname is not specified,
Xlib uses whatever it believes is the fastest transport.
If the hostname is a host machine name and a double colon (::)
separates the hostname and display number,
.ZN XOpenDisplay
connects using DECnet.
A single X server can support any or all of these transport mechanisms
simultaneously.
A particular Xlib implementation can support many more of these transport
mechanisms.
.LP
.IN "Display"
If successful,
.ZN XOpenDisplay
returns a pointer to a
.ZN Display
structure,
which is defined in
.hN X11/Xlib.h .
If
.ZN XOpenDisplay
does not succeed, it returns NULL.
After a successful call to
.ZN XOpenDisplay ,
all of the screens in the display can be used by the client.
The screen number specified in the display_name argument is returned
by the
.ZN DefaultScreen
macro (or the
.ZN XDefaultScreen
function).
You can access elements of the
.ZN Display
and
.ZN Screen
structures only by using the information macros or functions.
For information about using macros and functions to obtain information from
the
.ZN Display
structure,
see section 2.2.1.
.LP
The
.ZN XCloseDisplay
function closes the connection to the X server for the display specified in the
.ZN Display
structure and destroys all windows, resource IDs
.Pn ( Window ,
.ZN Font ,
.ZN Pixmap ,
.ZN Colormap ,
.ZN Cursor ,
and
.ZN GContext ),
or other resources that the client has created
on this display, unless the close-down mode of the resource has been changed
(see
.ZN XSetCloseDownMode ).
Therefore, these windows, resource IDs, and other resources should never be
referenced again or an error will be generated.
Before exiting, you should call
.ZN XCloseDisplay
explicitly so that any pending errors are reported as
.ZN XCloseDisplay
performs a final
.ZN XSync
operation.
.IN "Resource IDs"
.IN "XCloseDisplay"
.LP
.ZN XCloseDisplay
can generate a
.ZN BadGC
error.
.SH "SEE ALSO"
AllPlanes(3X11),
XFlush(3X11),
XSetCloseDownMode(3X11)
.br
\fI\*(xL\fP