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X11R7.4 - man page for xselectinput (x11r4 section 3)

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XSelectInput(3) 			  XLIB FUNCTIONS			  XSelectInput(3)

NAME
       XSelectInput - select input events

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

ARGUMENTS
       display	 Specifies the connection to the X server.

       event_mask
		 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 usu-
       ally 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 win-
       dow but not for other clients.  Multiple clients can select for the same events on the
       same window with the following restrictions:

       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, ConfigureRequest, or MapRe-
	    quest 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.

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

SEE ALSO
       Xlib - C Language X Interface

X Version 11				   libX11 1.2.1 			  XSelectInput(3)
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