ignore certain failures (-e/-z options)

[marty leisner]

I'm glad to see work on -z failures  ( I started this in 2002).

I'm again facing the need for these -- what I need is to ignore certain
"good" errnos (like EAGAIN)  -- this has to do with
systems which are polling be able to see "failures" from "failed polls"
(the failed polls generally overwhelm real failures/good results)

What I was thinking is a way to have a "list of failures to ignore"
(primarily EAGAIN).

marty
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