https://invisible-island.net/xterm/xtoolkit/
XtAppError, XtAppSetErrorHandler, XtAppSetWarningHandler, XtAppWarning
- low-level error handlers
#include <X11/Intrinsic.h>
void XtAppError(XtAppContext app_context, const char *message);
XtErrorHandler XtAppSetErrorHandler(XtAppContext app_context, XtEr-
rorHandler handler);
XtErrorHandler XtAppSetWarningHandler(XtAppContext app_context, XtEr-
rorHandler handler);
void XtAppWarning(XtAppContext app_context, const char *message);
app_context
Specifies the application context.
message Specifies the nonfatal error message that is to be reported.
handler Specifies the new fatal error procedure, which should not
return, or the nonfatal error procedure, which usually
returns.
message Specifies the message that is to be reported.
The XtAppError function calls the installed error procedure and passes
the specified 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.
XtAppGetErrorDatabase(3), XtAppErrorMsg(3)
X Toolkit Intrinsics – C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.1.5.2 XtAppError(3)