[exim] readsocket - errno?

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Author: Felipe Gasper
Date:  
To: exim users
Subject: [exim] readsocket - errno?
https://www.exim.org/exim-html-current/doc/html/spec_html/ch-string_expansions.html

^ I don’t see anything that indicates that “fail string” has access to the actual errno value. Is there a variable that provides that value in the fail string?

Thank you!

cheers,
-Felipe Gasper