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Re: Query about Emacs Process API | Asynchronous processes

From: Narendra Joshi
Subject: Re: Query about Emacs Process API | Asynchronous processes
Date: Sun, 05 Jul 2020 16:33:49 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Eli Zaretskii <> writes:

>> From: Narendra Joshi <>
>> 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.
I read that section of the manual. I am still not sure what will be the
use cases for this. Where in Emacs (or the package ecosystem) is this
feature being used currently?

Narendra Joshi

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