Function spawn_process 

pub async fn spawn_process(
    program: &str,
    args: &[String],
    cwd: &Path,
    env: &HashMap<String, String>,
    arg0: &Option<String>,
    inherited_fds: &[i32],
) -> Result<SpawnedProcess>

Spawn a process using regular pipes and preserve selected inherited file descriptors across exec on Unix.