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XSelectInput(3)                 XLIB FUNCTIONS                 XSelectInput(3)

       XSelectInput - select input events

       int XSelectInput(Display *display, Window w, long event_mask);

       display   Specifies the connection to the X server.

                 Specifies the event mask.

       w         Specifies the window whose events you are interested in.

       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

       o    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.

       o    Only one client at a time can select CirculateRequest, Configur-
            eRequest, or MapRequest events, which are associated with the
            event mask SubstructureRedirectMask.

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

       o    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.

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

       Xlib - C Language X Interface

X Version 11                     libX11 1.1.5                  XSelectInput(3)