Specifies the application context.
Specifies the nonfatal error message that is to be reported. or the nonfatal error procedure, which usually returns
Specifies the new fatal error procedure, which should not return,.
Specifies the message that is to be reported.
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.
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