Function sys_getsockopt

api/src/syscall/net/opt.rs:115–154

(
    fd: i32,
    level: u32,
    optname: u32,
    optval: UserPtr<u8>,
    optlen: UserPtr<socklen_t>,
)

}

pub fn sys_getsockopt(
    fd: i32,
    level: u32,
    optname: u32,
    optval: UserPtr<u8>,
    optlen: UserPtr<socklen_t>,
) -> AxResult<isize> {
    let optlen = optlen.get_as_mut()?;
    debug!(
        "sys_getsockopt <= fd: {}, level: {}, optname: {}, optval: {:?}, optlen: {}",
        fd,
        level,
        optname,
        optval.address(),
        optlen,
    );

    fn get<'a, T: 'static>(val: UserPtr<u8>, len: &mut socklen_t) -> AxResult<&'a mut T> {
        if (*len as usize) < size_of::<T>() {
            return Err(AxError::InvalidInput);
        }
        *len = size_of::<T>() as socklen_t;
        val.cast().get_as_mut()
    }

    let socket = Socket::from_fd(fd)?;
    macro_rules! dispatch {
        ($which:ident) => {
            socket.get_option(GetSocketOption::$which(get(optval, optlen)?))?;
        };
        ($which:ident as $conv:ty) => {
            let mut val = Default::default();
            socket.get_option(GetSocketOption::$which(&mut val))?;
            *get(optval, optlen)? = <$conv>::rust_to_sys(val)?;
        };
    }
    call_dispatch!(dispatch, (level, optname));

    Ok(0)
}

pub fn sys_setsockopt(
    fd: i32,