native-ipc 0.5.0

One safe API for least-authority native shared memory: sealed memfd on Linux, Mach memory entries on macOS, exact-rights sections on Windows
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use super::*;

#[test]
fn zero_id_fails_and_preparation_preserves_generic_metadata() {
    assert!(RegionId::new(0).is_none());
    assert!(matches!(
        PrivateRegion::allocate(RegionOptions::fixed(37).with_guard_policy(GuardPolicy::Require)),
        Err(RegionError::GuardUnavailable)
    ));
    let mut private = PrivateRegion::allocate(RegionOptions::fixed(37)).unwrap();
    private.initialize(|bytes| bytes[..4].copy_from_slice(b"NIPC"));
    let id = RegionId::new(9).unwrap();
    let prepared = private
        .prepare(RegionSpec {
            id,
            writer: WriterEndpoint::Receiver,
        })
        .unwrap();
    assert_eq!(prepared.spec.id, id);
    assert_eq!(prepared.spec.writer, WriterEndpoint::Receiver);
    assert_eq!(
        prepared.request.permissions().peer_access(),
        memory::MemoryAccess::ReadWrite
    );
    assert_eq!(
        prepared.guard_capability(),
        GuardCapability {
            requested: GuardPolicy::BestEffort,
            installed: false,
        }
    );
    assert!(prepared.request.mapped_len() >= 37);
}