X Version 11 (1 September 1988) XSelectInput(XS)
NAME
XSelectInput - select input events
SYNTAX
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.
SEE ALSO
Xlib - C Language X Interface
(printed 2/12/90) (1 September 1988) XSelectInput(XS)