CentOS 7.0 - man page for xselectinput (centos section 3)
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XSelectInput(3) XLIB FUNCTIONS XSelectInput(3)
XSelectInput - select input events
int XSelectInput(Display *display, Window w, long event_mask);
display Specifies the connection to the X server.
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 usu-
ally 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 win-
dow but not for other clients. Multiple clients can select for the same events on the
same window with the following restrictions:
o 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
o Only one client at a time can select CirculateRequest, ConfigureRequest, or MapRe-
quest events, which are associated with the event mask SubstructureRedirectMask.
o Only one client at a time can select a ResizeRequest event, which is associated with
the event mask ResizeRedirectMask.
o 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
X Version 11 libX11 1.6.0 XSelectInput(3)
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