X Version 11 (Release 6.1)

XSelectInput(X3xlib)

XSelectInput -- select input events

Synopsis

   XSelectInput(display, w, event_mask)
         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 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.

References

Xlib - C Language X Interface