use std::io::Read;

        let mut process = std::process::Command::new(&cmd)

        let mut process = tokio::process::Command::new(&cmd)

            .stdin(std::process::Stdio::piped())
            .stderr(std::process::Stdio::piped())

        s.read(&mut [0u8])?;

        s.read_exact(&mut [0u8]).await?;