MirBSD manpage: XCloseDisplay(3), XOpenDisplay(3)

XOpenDisplay(3X11)       XLIB FUNCTIONS        XOpenDisplay(3X11)


     XOpenDisplay, XCloseDisplay - connect or disconnect to X


     Display *XOpenDisplay(char *display_name);

     int XCloseDisplay(Display *display);


     display   Specifies the connection to the X server.

               Specifies the hardware display name, which deter-
               mines 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.


     The XOpenDisplay function returns a Display structure that
     serves as the connection to the X server and that contains
     all the information about that X server. XOpenDisplay con-
     nects your application to the X server through TCP or DECnet
     communications protocols, 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, 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, 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.

     If successful, XOpenDisplay returns a pointer to a Display
     structure, which is defined in <X11/Xlib.h>. If XOpenDisplay
     does not succeed, it returns NULL. After a successful call
     to 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 DefaultScreen macro
     (or the XDefaultScreen function). You can access elements of
     the Display and Screen structures only by using the informa-
     tion macros or functions. For information about using macros
     and functions to obtain information from the Display struc-
     ture, see section 2.2.1.

     The XCloseDisplay function closes the connection to the X
     server for the display specified in the Display structure
     and destroys all windows, resource IDs (Window, Font, Pix-
     map, Colormap, Cursor, and GContext), or other resources

XFree86                   Version 4.5.0                         1

XOpenDisplay(3X11)       XLIB FUNCTIONS        XOpenDisplay(3X11)

     that the client has created on this display, unless the
     close-down mode of the resource has been changed (see
     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
     XCloseDisplay explicitly so that any pending errors are
     reported as XCloseDisplay performs a final XSync operation.

     XCloseDisplay can generate a BadGC error.


     AllPlanes(3X11), XFlush(3X11), XSetCloseDownMode(3X11)
     Xlib - C Language X Interface

XFree86                   Version 4.5.0                         2

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