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XSelectInput(3) XLIB FUNCTIONS XSelectInput(3)

XSelectInput - select input events

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

Specifies the connection to the X server.
Specifies the event mask.
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 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.

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

Xlib - C Language X Interface
libX11 1.6.7 X Version 11

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