R help - Feb 2012 - Find exit status inside on.exit

Hello,
Does anyone know if it is possible to find out whether a calling function exited
with an error or not inside of an on.exit() call? I'd like to use the same
error cleanup function inside of several functions, and for aesthetic reasons
would prefer not to surround the body of all of these function with a tryCatch.

Something like this:

isError <- function() {
        parentError <- ???
        if (!parentError) cat("No errors here!\n")
}

X <- function() {
        on.exit(isError())
        1+1
}
> X()
[1] 2
No errors here!

Thanks,
Robert

Robert McGehee, CFA
Geode Capital Management, LLC
One Post Office Square, 28th Floor | Boston, MA | 02109
Direct: (617)392-8396

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