Function nc::tee

pub fn tee(
    fd_in: i32, 
    fd_out: i32, 
    len: size_t, 
    flags: u32
) -> Result<ssize_t, Errno>

Duplicate pipe content.

let mut fds_left = [0, 0];
let ret = nc::pipe(&mut fds_left);
assert!(ret.is_ok());

let mut fds_right = [0, 0];
let ret = nc::pipe(&mut fds_right);
assert!(ret.is_ok());

let msg = "Hello, Rust";
let ret = nc::write(fds_left[1], msg.as_ptr() as usize, msg.len());
assert!(ret.is_ok());
let n_write = ret.unwrap() as nc::size_t;
assert_eq!(n_write, msg.len());

let ret = nc::tee(fds_left[0], fds_right[1], n_write, nc::SPLICE_F_NONBLOCK);
assert!(ret.is_ok());

let mut buf = [0u8; 64];
let buf_len = buf.len();
let ret = nc::read(fds_right[0], buf.as_mut_ptr() as usize, buf_len);
assert!(ret.is_ok());
let n_read = ret.unwrap() as nc::size_t;
assert_eq!(n_read, n_write);
let read_msg = std::str::from_utf8(&buf[..n_read]);
assert!(read_msg.is_ok());
assert_eq!(Ok(msg), read_msg);

assert!(nc::close(fds_left[0]).is_ok());
assert!(nc::close(fds_left[1]).is_ok());
assert!(nc::close(fds_right[0]).is_ok());
assert!(nc::close(fds_right[1]).is_ok());