void XtAppError (app_context, message) XtAppContext app_context; String message;void XtAppSetErrorHandler (app_context, handler) XtAppContext app_context; XtErrorHandler handler;
void XtAppSetWarningHandler (app_context, handler) XtAppContext app_context; XtErrorHandler handler;
void XtAppWarning (app_context, message) XtAppContext app_context; String message;
The XtAppSetErrorHandler
function registers the specified procedure,
which is called when a fatal error condition occurs.
The XtAppSetWarningHandler registers the specified procedure, which is called when a nonfatal error condition occurs.
The XtAppWarning function calls the installed nonfatal error procedure and passes the specified message.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface