nc 0.9.8

Access system calls directly
Documentation 
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/// Add a key to the kernel's key management facility.
pub unsafe fn add_key<P: AsRef<Path>>(
    type_: P,
    description: P,
    payload: *const core::ffi::c_void,
    plen: size_t,
    dest_keyring: key_serial_t,
) -> Result<key_serial_t, Errno> {
    let type_ = CString::new(type_.as_ref());
    let type_ptr = type_.as_ptr() as usize;
    let payload = payload as usize;
    let description = CString::new(description.as_ref());
    let description_ptr = description.as_ptr() as usize;
    let dest_keyring = dest_keyring as usize;
    unsafe {
        syscall5(
            SYS_ADD_KEY,
            type_ptr,
            description_ptr,
            payload,
            plen,
            dest_keyring,
        )
        .map(|ret| ret as key_serial_t)
    }
}