This was a toy example. -$! is returned from a perl callback for which it makes sense to return a negated errno back to C. Unfortunately, strange bugs started to pop up under FreeBSD, and this issue could be related to it.

Thanks everyone for helping.

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

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