Quoting William Conrad Halliburton ([EMAIL PROTECTED]):
> 2. Using ignore-errors around multiple lisp processes. On error I output
Around multiple lisp processes?
> the error message to a log file. I wish to also output a backtrace. How
> can I print a backtrace from the returned condition?
Try something along these lines:
(defmacro my-ignore-errors (() &body body)
"Like IGNORE-ERRORS, but in case of failure, return backtrace string as
third value."
`(block %debug-escape
(handler-bind
((error (lambda (c)
(let ((backtrace
(with-output-to-string (*debug-io*)
(debug:backtrace))))
(return-from %debug-escape
(values nil c backtrace))))))
,@body)))
(As a bit of unsolicited advice, specific handlers are normally
preferred over IGNORE-ERRORS, but for logging in servers a `catch-all'
error handler can make sense. However, macros like this one should
normally check for a global variable at run-time, thus allowing the user
to turn error handling off while debugging without having to
re-compile.)
