fix: set errno to EINVAL on negative seek position#400
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Real Perl's seek/sysseek sets $! to EINVAL when the resulting file position would be negative. The tied SEEK method was correctly returning 0 (failure) but not setting errno. Closes cpan-authors#342 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This was referenced May 18, 2026
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What
Set
$! = EINVALwhen seek/sysseek resolves to a negative position.Why
Real Perl's seek sets errno to EINVAL on invalid positions. The tied SEEK method returned 0 (correct) but didn't set
$!, making it impossible for callers to distinguish the failure reason. Closes #342.How
One-line addition in
FileHandle.pmSEEK method, plus three errno assertions int/seek.t.Testing
t/seek.t— added$! + 0 == EINVALchecks for SEEK_SET, SEEK_CUR, and SEEK_END negative-position paths.🤖 Generated with Claude Code
Quality Report
Changes: 9 files changed, 77 insertions(+), 1173 deletions(-)
Code scan: clean
Tests: failed (FAILED)
Branch hygiene: clean
Generated by Kōan post-mission quality pipeline