Re: emacsclient in elisp

[Eli Zaretskii]

> Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
> From: Daniel Mendler <mail@daniel-mendler.de>
> Date: Thu, 20 May 2021 17:52:31 +0200
> 
> On 5/20/21 5:10 PM, Eli Zaretskii wrote:
> >> It would be useful to have Emacs that can read stdin. 
> > 
> > Emacs already is capable of doing that, see the node "Input Streams"
> > in the ELisp manual.
> 
> Yes, synchronously reading from stdin is supported. But it is not
> possible to do this asynchronously, or is it? This was specifically the
> functionality I have been looking for.

What do you mean by that? how can Emacs read input _asynchronously_
when reading is inherently a synchronous operation?

And what would be on the other end of such asynchronous input,
producing the stuff Emacs is supposed to read?