extern crate libc;
use libc::vmsplice;
use libc::c_void;

fn main() {
    let bufsize = 16 * 1024 * 1024;
    let mut buf = "y\n".repeat(bufsize / 2).into_bytes();

    let iovec = libc::iovec {
        iov_base: buf.as_mut_ptr() as *mut c_void,
        iov_len: bufsize,
    };
    let iov_max = libc::_SC_IOV_MAX as usize;
    unsafe {
        loop {
            vmsplice(1, &iovec, iov_max, libc::SPLICE_F_GIFT);
        }
    }
}