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Table of Contents
XSelectInput - select input events
- int XSelectInput(Display *display, Window w, long
- event_mask);
- display
- Specifies the connection to the X server.
- event_mask
- Specifies the event mask.
- w
- 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.
- BadWindow
- A value for a Window argument does not name a defined Window.
Xlib - C Language X Interface
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