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Re: Query about Emacs Process API | Asynchronous processes
From: |
Eli Zaretskii |
Subject: |
Re: Query about Emacs Process API | Asynchronous processes |
Date: |
Sun, 05 Jul 2020 17:29:33 +0300 |
> From: Narendra Joshi <narendraj9@gmail.com>
> Date: Sun, 05 Jul 2020 00:42:22 +0200
>
> #+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?
>From the ELisp manual:
:command COMMAND
Use COMMAND as the command line of the process. The value
should be a list starting with the program’s executable file
name, followed by strings to give to the program as its
arguments. If the first element of the list is ‘nil’, Emacs
opens a new pseudoterminal (pty) and associates its input and
output with BUFFER, without actually running any program; the
rest of the list elements are ignored in that case.