From: Narendra Joshi <narendraj9@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Query about Emacs Process API | Asynchronous processes
Date: Wed, 08 Jul 2020 00:26:38 +0200 [thread overview]
Message-ID: <87imezyna9.fsf@gmail.com> (raw)
In-Reply-To: <87eeppydvc.fsf@gmail.com> (Narendra Joshi's message of "Sun, 05 Jul 2020 21:13:11 +0200")
Narendra Joshi <narendraj9@gmail.com> writes:
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>
>>> 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?
>>
>> I think it's used for `ielm`.
>>
>> Stefan
>>
> `ielm` seems to be adding a dummy process to its buffer using either
> `cat` or `hexl` binary.
>
> ;; A dummy process to keep comint happy. It will never get any input
> (unless (comint-check-proc (current-buffer))
> ;; Was cat, but on non-Unix platforms that might not exist, so
> ;; use hexl instead, which is part of the Emacs distribution.
> (condition-case nil
> (start-process "ielm" (current-buffer) "hexl")
> (file-error (start-process "ielm" (current-buffer) "cat")))
> (set-process-query-on-exit-flag (ielm-process) nil)
> (goto-char (point-max))
I, finally, found the reason for adding it. It's being used by
`gdb-mi.el`. I am still not sure how and why because I am not familiar
with `gdb-mi`.
#+begin_src emacs-lisp
;; We want to use comint because it has various nifty and familiar features.
(define-derived-mode gdb-inferior-io-mode comint-mode "Inferior I/O"
"Major mode for gdb inferior-io."
:syntax-table nil :abbrev-table nil
(make-comint-in-buffer "gdb-inferior" (current-buffer) nil))
#+end_src
The feature was added to `make-process` for `gdb-mi.el` in this commit:
#+begin_src vc-git-log-view
850d0752fb8ab02e3ffc80567578f9e9a4cb77f9
Author: Nick Roberts <nickrob@snap.net.nz>
Date: Thu Aug 13 13:22:55 2009 +0000
(create_pty): New function.
(Fstart_process): Use it to allow Emacs to just associate a pty
with the buffer. See associated change in gdb-mi.el.
(list_processes_1): Deal with no program name.
(start_process_unwind): Use pid == -2 to mean no process.
850d0752fb8ab02e3ffc80567578f9e9a4cb77f9
#+end_src
Best,
--
Narendra Joshi
prev parent reply other threads:[~2020-07-07 22:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-04 22:42 Query about Emacs Process API | Asynchronous processes Narendra Joshi
2020-07-05 14:29 ` Eli Zaretskii
2020-07-05 14:33 ` Narendra Joshi
2020-07-05 15:25 ` Stefan Monnier
2020-07-05 19:13 ` Narendra Joshi
2020-07-07 22:26 ` Narendra Joshi [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87imezyna9.fsf@gmail.com \
--to=narendraj9@gmail.com \
--cc=help-gnu-emacs@gnu.org \
--cc=monnier@iro.umontreal.ca \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.