XSelectInput(3X11)

NAME

XSelectInput − select input events

SYNTAX

XSelectInput(display, w, event_mask)
      Display ∗display;
      Window w;
      long event_mask;

ARGUMENTS

displaySpecifies the connection to the X server.

event_maskSpecifies the event mask.

wSpecifies 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.