Function tee

pub unsafe fn tee(
    fd_in: i32,
    fd_out: i32,
    len: usize,
    flags: u32,
) -> Result<isize, i32> 

Available on crate feature dep_nc only.

Duplicate pipe content.

Examples

let mut fds_left = [0, 0];
let ret = unsafe { nc::pipe2(&mut fds_left, 0) };
assert!(ret.is_ok());

let mut fds_right = [0, 0];
let ret = unsafe { nc::pipe2(&mut fds_right, 0) };
assert!(ret.is_ok());

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

let ret = unsafe { 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 = unsafe { nc::read(fds_right[0], &mut buf) };
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);

unsafe {
    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());
}