XtBuildEventMask - retrieve a widget's event mask

w         Specifies the widget.

       The  XtBuildEventMask  function returns the event mask representing the logical OR of all event masks for
       event handlers registered on the widget with XtAddEventHandler  and  all  event  translations,  including
       accelerators,  installed on the widget.  This is the same event mask stored into the XSetWindowAttributes
       structure by XtRealizeWidget and sent to the server when event handlers and translations are installed or
       removed on the realized widget.

       XtBuildEventMask - retrieve a widget's event mask

XtAddEventHandler(3)
       XToolkitIntrinsics-CLanguageInterfaceXlib-CLanguageXInterface

X Version 11                                       libXt 1.2.1                               XtBuildEventMask(3)

       #include <X11/Intrinsic.h>

       EventMask XtBuildEventMask(Widget w);