257 lines
6.6 KiB
Groff
257 lines
6.6 KiB
Groff
.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included
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.\" in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the X Consortium.
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.\"
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
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.\" Digital Equipment Corporation
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.\"
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.\" Portions Copyright \(co 1990, 1991 by
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.\" Tektronix, Inc.
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.\"
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.\" Permission to use, copy, modify and distribute this documentation for
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.\" any purpose and without fee is hereby granted, provided that the above
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.\" copyright notice appears in all copies and that both that copyright notice
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.\" and this permission notice appear in all copies, and that the names of
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.\" Digital and Tektronix not be used in in advertising or publicity pertaining
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.\" to this documentation without specific, written prior permission.
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.\" Digital and Tektronix makes no representations about the suitability
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.\" of this documentation for any purpose.
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.\" It is provided ``as is'' without express or implied warranty.
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.\"
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.\"
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xW Athena X Widgets \- C Language X Toolkit Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.\".ps \\n(PS
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.fi
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.de FD
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.LP
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.KS
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.de FN
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.KE
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.LP
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.de IN \" send an index entry to the stderr
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..
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.de C{
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.KS
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.nf
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.D
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.\"
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.\" choose appropriate monospace font
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.\" may be changed to L if LB is too
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.ie "\\*(.T"480" .ft L
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.ny0
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.TH XOpenDisplay __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
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.SH NAME
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XOpenDisplay, XCloseDisplay \- connect or disconnect to X server
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.SH SYNTAX
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.HP
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Display *XOpenDisplay\^(\^char *\fIdisplay_name\fP\^);
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.HP
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int XCloseDisplay\^(Display *\fIdisplay\fP\^);
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.SH ARGUMENTS
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.IP \fIdisplay_name\fP 1i
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Specifies the hardware display name, which determines the display
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and communications domain to be used.
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On a POSIX-conformant system, if the display_name is NULL,
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it defaults to the value of the DISPLAY environment variable.
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.IN "Environment" "DISPLAY"
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.SH DESCRIPTION
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The
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.ZN XOpenDisplay
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function returns a
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.ZN Display
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structure that serves as the
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connection to the X server and that contains all the information
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about that X server.
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.ZN XOpenDisplay
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connects your application to the X server through TCP
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or DECnet communications protocols,
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or through some local inter-process communication protocol.
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.IN "Protocol" "TCP"
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.IN "Protocol" "DECnet"
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If the hostname is a host machine name and a single colon (:)
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separates the hostname and display number,
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.ZN XOpenDisplay
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connects using TCP streams.
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If the hostname is not specified,
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Xlib uses whatever it believes is the fastest transport.
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If the hostname is a host machine name and a double colon (::)
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separates the hostname and display number,
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.ZN XOpenDisplay
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connects using DECnet.
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A single X server can support any or all of these transport mechanisms
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simultaneously.
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A particular Xlib implementation can support many more of these transport
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mechanisms.
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.LP
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.IN "Display"
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If successful,
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.ZN XOpenDisplay
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returns a pointer to a
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.ZN Display
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structure,
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which is defined in
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.hN X11/Xlib.h .
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If
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.ZN XOpenDisplay
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does not succeed, it returns NULL.
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After a successful call to
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.ZN XOpenDisplay ,
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all of the screens in the display can be used by the client.
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The screen number specified in the display_name argument is returned
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by the
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.ZN DefaultScreen
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macro (or the
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.ZN XDefaultScreen
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function).
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You can access elements of the
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.ZN Display
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and
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.ZN Screen
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structures only by using the information macros or functions.
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For information about using macros and functions to obtain information from
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the
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.ZN Display
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structure,
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see section 2.2.1.
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.LP
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The
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.ZN XCloseDisplay
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function closes the connection to the X server for the display specified in the
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.ZN Display
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structure and destroys all windows, resource IDs
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.Pn ( Window ,
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.ZN Font ,
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.ZN Pixmap ,
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.ZN Colormap ,
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.ZN Cursor ,
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and
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.ZN GContext ),
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or other resources that the client has created
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on this display, unless the close-down mode of the resource has been changed
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(see
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.ZN XSetCloseDownMode ).
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Therefore, these windows, resource IDs, and other resources should never be
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referenced again or an error will be generated.
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Before exiting, you should call
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.ZN XCloseDisplay
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explicitly so that any pending errors are reported as
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.ZN XCloseDisplay
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performs a final
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.ZN XSync
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operation.
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.IN "Resource IDs"
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.IN "XCloseDisplay"
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.LP
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.ZN XCloseDisplay
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can generate a
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.ZN BadGC
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error.
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.SH "SEE ALSO"
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AllPlanes(__libmansuffix__),
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XFlush(__libmansuffix__),
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XSetCloseDownMode(__libmansuffix__)
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.br
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\fI\*(xL\fP
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