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dev_t is signed on some platforms (macOS: i32), and st_rdev has that type just like st_dev. st_dev already sign-extends a negative value; st_rdev went straight through u64::try_from(..).unwrap(), which panics with TryFromIntError on a negative device number. Apply the same conversion, which also matches std's MetadataExt::st_rdev (`st_rdev as u64`).
This was referenced Sep 17, 2026
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Fixes #427.
dev_tis signed on some platforms (on macOS it isi32).from_rustixalready handles that forst_devby sign-extending throughi64, butst_rdevhas the same type and went throughu64::try_from(stat.st_rdev).unwrap(), which panics withTryFromIntError(())when the device number is negative. We hit this on an x86_64 macOS host:symlink_metadatapanics atmetadata_ext.rs:171.This applies the existing
st_devconversion tost_rdevand widens the existing comment to cover both. The function's#[allow(unused_comparisons)]already covers platforms wheredev_tis unsigned. Sign-extending matches std:std::os::darwin::fs::MetadataExt::st_rdevreturnsst_rdev as u64.There's no regression test, because a negative
st_rdevcan't be produced portably. The change mirrors thest_devcode a few lines above.Checked locally with Rust 1.95.0:
cargo fmt --all -- --check,cargo test -p cap-primitives(Linux), andcargo check -p cap-primitivesforx86_64-apple-darwinandaarch64-apple-darwin.If this is acceptable, a 4.0.4 patch release would let downstream users pick it up without a
[patch]. Thanks!