I can't neither help you on the C-level, Perl source code is very special with all its preprocessor macros.
(UPDATE. striked nonsense, see reply)
In the case of readdir the following should help
$! = undef;
@a = readdir(D) or process_errno();
But in the case of readline it doesn't.
The other advices I gave you - like catching $SIG{WARN} - are still valid,
I will post the ticket-link after reporting the perlbug.
Cheers Rolf
( addicted to the Perl Programming Language)
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