XSelectInput - Online Linux Manual PageSection : 3
Updated : libX11 1.8.4
Source : X Version 11
Note : XLIB FUNCTIONS

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NAMEXSelectInput − select input events

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

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ARGUMENTSdisplay Specifies the connection to the X server. event_mask Specifies the event mask. w Specifies the window whose events you are interested in.

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DESCRIPTIONThe 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.

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

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SEE ALSOXlib − C Language X Interface 0

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