https://invisible-island.net/xterm/xtoolkit/
XtAppErrorMsg, XtAppSetErrorMsgHandler, XtAppSetWarningMsgHandler,
XtAppWarningMsg - high-level error handlers
#include <X11/Intrinsic.h>
void XtAppErrorMsg(XtAppContext app_context, const char *name, const
char *type, const char *class, const char *defaultMsg, String
*params, Cardinal *num_params);
XtErrorMsgHandler XtAppSetErrorMsgHandler(XtAppContext app_context,
XtErrorMsgHandler msg_handler);
XtErrorMsgHandler XtAppSetWarningMsgHandler(XtAppContext app_context,
XtErrorMsgHandler msg_handler);
void XtAppWarningMsg(XtAppContext app_context, const char *name, const
char *type, const char *class, const char *defaultMsg, String
*params, Cardinal *num_params);
app_context
Specifies the application context.
class Specifies the resource class of the error message.
defaultMsg
Specifies the default message to use.
name Specifies the general kind of error.
type Specifies the detailed name of the error.
msg_handler
Specifies the new fatal error procedure, which should not
return or the nonfatal error procedure, which usually
returns.
num_params
Specifies the number of values in the parameter list.
params Specifies a pointer to a list of values to be stored in the
message.
The XtAppErrorMsg function calls the high-level error handler and
passes the specified information.
The XtAppSetErrorMsgHandler function registers the specified proce-
dure, which is called when a fatal error occurs.
The XtAppSetWarningMsgHandler function registers the specified proce-
dure, which is called when a nonfatal error condition occurs.
The XtAppWarningMsg function calls the high-level error handler and
passes the specified information.
XtAppGetErrorDatabase(3), XtAppError(3)
X Toolkit Intrinsics – C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.1.5.2 XtAppErrorMsg(3)