nc 0.9.7

Access system calls directly
Documentation 
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/// Open and possibly create a file within a directory.
pub unsafe fn openat_nocancel<P: AsRef<Path>>(
    dirfd: i32,
    filename: P,
    flags: i32,
    mode: mode_t,
) -> Result<i32, Errno> {
    let dirfd = dirfd as usize;
    let filename = CString::new(filename.as_ref());
    let filename_ptr = filename.as_ptr() as usize;
    let flags = flags as usize;
    let mode = mode as usize;
    syscall4(SYS_OPENAT_NOCANCEL, dirfd, filename_ptr, flags, mode).map(|ret| ret as i32)
}