nc 0.9.8

Access system calls directly
Documentation 
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/// Opens the file referenced by `fh` for reading and/or writing,
/// and returns the file descriptor to the calling process.
pub unsafe fn fhopen(fh: &fhandle_t, flags: i32) -> Result<i32, Errno> {
    let fh_ptr = core::ptr::from_ref(fh) as usize;
    let flags = flags as usize;
    unsafe { syscall2(SYS_FHOPEN, fh_ptr, flags).map(|val| val as i32) }
}