XOpenDisplay man page on Ultrix

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XOpenDisplay(3X11)		     X11R5		    XOpenDisplay(3X11)

Name
       XOpenDisplay, XCloseDisplay - connect or disconnect to X server

Syntax
       Display *XOpenDisplay(display_name)
	  char *display_name;

       XCloseDisplay(display)
	  Display *display;

Arguments
       display	 Specifies the connection to the X server.

       display_name
		 Specifies the hardware display name, which determines the
		 display and communications domain to be used.	On a POSIX
		 system, if the display_name is NULL, it defaults to the value
		 of the DISPLAY environment variable.

Description
       The function returns a structure that serves as the connection to the X
       server and that contains all the information about that X server.  con‐
       nects your application to the X server through TCP or DECnet communica‐
       tions protocols, if supported by your system, or through some local
       inter-process communication protocol.  If the hostname is a host
       machine name and a single colon (:) separates the hostname and display
       number, attempts to connect 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, attempts to connect 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.

       If successful, returns a pointer to a structure, which is defined in If
       does not succeed, it returns NULL.  After a successful call to all of
       the screens in the display can be used by the client.  The screen num‐
       ber specified in the display_name argument is returned by the macro (or
       the function).  You can access elements of the and structures only by
       using the information macros or functions.  For information about using
       macros and functions to obtain information from the structure, see sec‐
       tion 2.2.1 in X Window System: The Complete Reference, Second Edition,
       Robert W. Scheifler and James Gettys.

       The function closes the connection to the X server for the display
       specified in the structure and destroys all windows, resource IDs and
       or other resources that the client has created on this display, unless
       the close-down mode of the resource has been changed (see Therefore,
       these windows, resource IDs, and other resources should never be refer‐
       enced again or an error will be generated.  Before exiting, you should
       call explicitly so that any pending errors are reported as performs a
       final operation.

       can generate a error.

See Also
       AllPlanes(3X11), XFlush(3X11), XSetCloseDownMode(3X11)
       X Window System: The Complete Reference, Second Edition, Robert W.
       Scheifler and James Gettys

							    XOpenDisplay(3X11)
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