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Query about Emacs Process API | Asynchronous processes
From: |
Narendra Joshi |
Subject: |
Query about Emacs Process API | Asynchronous processes |
Date: |
Sun, 05 Jul 2020 00:42:22 +0200 |
Hi,
Reading through Emacs Lisp info manual, I found out
[[info:elisp#Asynchronous Processes][info:elisp#Asynchronous Processes]]
that it's possible to create an asynchronous process (let's ignore
network processes for now) without any command at all. For example,
#+begin_src emacs-lisp
(make-process :name "a-pty-process" :command (list nil) :buffer
"*a-pty-process-buffer*")
#+end_src
This creates a process with a pseudo terminal. This process is shown by
`list-processes`
#+begin_src
Process ▼ PID Status Buffer TTY Thread Command
a-pty-process -2 run *a-pty-process-buffer* /dev/pts/1 Main
#+end_src
^ The process ID is a negative number. It makes me think that there is
no real sub-process (OS level) yet. Is that true? If not, what is being
executed by the sub-process?
I am wondering what the use cases are that such a feature serves.
Thanks,
--
Narendra Joshi
- Query about Emacs Process API | Asynchronous processes,
Narendra Joshi <=