}
}
fn pipe() -> Result<(OwnedFd, OwnedFd), std::io::Error> {
    use std::os::fd::FromRawFd;
    let mut fd = [0; 2];
    unsafe {
        if libc::pipe(fd.as_mut_ptr()) != 0 {
            Err(std::io::Error::last_os_error())
        } else {
            Ok((OwnedFd::from_raw_fd(fd[0]), OwnedFd::from_raw_fd(fd[1])))
        }

                let (reader_out, writer_out) = std::io::pipe().unwrap();
                let (reader_err, writer_err) = std::io::pipe().unwrap();

                let (reader_out, writer_out) = pipe().unwrap();
                let (reader_err, writer_err) = pipe().unwrap();

exclude = [ "essai" ]