Writing to errno both directly and via $! aren't new, and there's no need to avoid doing so. 

$ perl -E'say $!=2'
No such file or directory

$ perl -E'say $!=3'
No such process

$ perl -E'say $!=4'
Interrupted system call

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In reply to Re^2: Different behaviour of 'stat' function after assignment to $! (errno). by ikegami
in thread Different behaviour of 'stat' function after assignment to $! (errno). by muxxum

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