XSelectInput.3X11.gz(3X11) — DG/UX R4.11MU05



XSelectInput(3X11)            SDK X11 R4.11MU05           XSelectInput(3X11)


NAME
       XSelectInput - select input events

SYNTAX
       XSelectInput(display, w, eventmask)
             Display *display;
             Window w;
             long eventmask;

ARGUMENTS
       display   Specifies the connection to the X server.

       eventmask
                 Specifies the event mask.

       w         Specifies the window whose events you are interested in.

DESCRIPTION
       The XSelectInput function requests that the X server report the
       events associated with the specified event mask.  Initially, X will
       not report any of these events.  Events are reported relative to a
       window.  If a window is not interested in a device event, it usually
       propagates to the closest ancestor that is interested, unless the
       do_not_propagate mask prohibits it.

       Setting the event-mask attribute of a window overrides any previous
       call for the same window but not for other clients.  Multiple clients
       can select for the same events on the same window with the following
       restrictions:

       ·    Multiple clients can select events on the same window because
            their event masks are disjoint.  When the X server generates an
            event, it reports it to all interested clients.

       ·    Only one client at a time can select CirculateRequest,
            ConfigureRequest, or MapRequest events, which are associated
            with the event mask SubstructureRedirectMask.

       ·    Only one client at a time can select a ResizeRequest event,
            which is associated with the event mask ResizeRedirectMask.

       ·    Only one client at a time can select a ButtonPress event, which
            is associated with the event mask ButtonPressMask.

       The server reports the event to all interested clients.

       XSelectInput can generate a BadWindow error.

DIAGNOSTICS
       BadWindow A value for a Window argument does not name a defined
                 Window.

SEE ALSO
       Xlib - C Language X Interface


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