pub fn spawn_async_with_pipes<P, T, U, V>(
working_directory: P,
argv: &[&Path],
envp: &[&Path],
flags: SpawnFlags,
child_setup: Option<Box<dyn FnOnce() + 'static, Global>>
) -> Result<(Pid, T, U, V), Error>where
P: AsRef<Path>,
T: FromRawFd,
U: FromRawFd,
V: FromRawFd,