Function test_mmap

tests/mm/mmap.rs:4–57

()

#[cfg(not(target_os = "redox"))]
#[test]
fn test_mmap() {
    use rustix::fs::{openat, Mode, OFlags, CWD};
    use rustix::io::write;
    use rustix::mm::{mmap, munmap, MapFlags, ProtFlags};
    use std::ptr::null_mut;
    use std::slice;

    let tmp = tempfile::tempdir().unwrap();
    let dir = openat(CWD, tmp.path(), OFlags::RDONLY, Mode::empty()).unwrap();

    let file = openat(
        &dir,
        "file",
        OFlags::CREATE | OFlags::WRONLY | OFlags::TRUNC,
        Mode::RUSR,
    )
    .unwrap();
    write(&file, &[b'a'; 8192]).unwrap();
    drop(file);

    let file = openat(&dir, "file", OFlags::RDONLY, Mode::empty()).unwrap();
    unsafe {
        let addr = mmap(
            null_mut(),
            8192,
            ProtFlags::READ,
            MapFlags::PRIVATE,
            &file,
            0,
        )
        .unwrap();
        let slice = slice::from_raw_parts(addr.cast::<u8>(), 8192);
        assert_eq!(slice, &[b'a'; 8192]);

        munmap(addr, 8192).unwrap();
    }

    let file = openat(&dir, "file", OFlags::RDONLY, Mode::empty()).unwrap();
    unsafe {
        assert_eq!(
            mmap(
                null_mut(),
                8192,
                ProtFlags::READ,
                MapFlags::PRIVATE,
                &file,
                u64::MAX,
            )
            .unwrap_err()
            .raw_os_error(),
            libc::EINVAL
        );
    }
}

#[test]
fn test_mmap_anonymous() {