GNU bug report logs - #33050
27.0.50; [macOS] Problem with process input with process-connection-type nil

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Filipp Gunbin <fgunbin <at> fastmail.fm>
Subject: bug#33050: closed (Re: bug#33050: 27.0.50; [macOS] Problem with
 process input with process-connection-type nil)
Date: Thu, 29 Nov 2018 14:10:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 33050 <at> debbugs.gnu.org.

-- 
33050: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=33050
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Filipp Gunbin <fgunbin <at> fastmail.fm>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: fitzsim <at> fitzsim.org, 33050-done <at> debbugs.gnu.org, eggert <at> cs.ucla.edu
Subject: Re: bug#33050: 27.0.50;
 [macOS] Problem with process input with process-connection-type nil
Date: Thu, 29 Nov 2018 17:09:20 +0300

On 29/11/2018 12:41 +0200, Eli Zaretskii wrote:

>> From: Filipp Gunbin <fgunbin <at> fastmail.fm>
>> Cc: eggert <at> cs.ucla.edu,  fitzsim <at> fitzsim.org,  33050 <at> debbugs.gnu.org
>> Date: Thu, 29 Nov 2018 12:51:09 +0300
>>
>> > I guess I'm confused regarding what you'd like to see on emacs-26.
>> > Was there a patch to that effect posted in this discussion, and if so,
>> > could you point me to it, please?
>>
>> Sure, it's in message https://debbugs.gnu.org/cgi/bugreport.cgi?bug=33050#89
>
> Thanks, now pushed to the emacs-26 branch.

Ok, I pushed the unconditional setting on master and am closing this
bug.

Thanks.

[Message part 3 (message/rfc822, inline)]

From: Filipp Gunbin <fgunbin <at> fastmail.fm>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50;
 [macOS] Problem with process input with process-connection-type nil
Date: Mon, 15 Oct 2018 22:03:19 +0300

I was investigating why eudc-ldap hangs, and stripped the problem to the
following (did this in emacs -Q):

(let ((buf (get-buffer-create "my-process-buf")))
  (with-current-buffer buf
    (erase-buffer)
    (let* ((process-connection-type nil)
	   (proc (start-process "my-process" buf "/usr/bin/read" "-p" "enter something:")))
      (while (null (progn
		     (goto-char (point-min))
		     (re-search-forward "enter something:" (point-max) t)))
	(accept-process-output proc 1)
	(message "proc status: %s" (process-status proc)))
      (message "found prompt")
      (message "proc status: %s" (process-status proc))
      (process-send-string proc "asdf")
      (process-send-string proc "\n")
      (while (not (memq (process-status proc) '(exit signal)))
	(sit-for 0.1))
      (message "exited"))))

If I let-bind process-connection-type to t (use pty) in above code, then
it works normally:

*Messages* :
proc status: run
found prompt
proc status: run
exited
"exited"

Buffer "my-process-buf":
enter something:
Process my-process<2> finished

But if I let-bind process-connection-type to nil (so does ldap.el), then
it hangs, and after a few seconds wait and C-g, *Messages* has only
this: "proc status: run [6 times]", and buffer my-process-buf is empty.

This is emacs master built with ./configure CC=/usr/bin/gcc --without-x
--without-sound --with-ns --with-file-notification=no --with-gnutls
--with-json --with-modules --with-threads --with-xml2 && make

Also tried --without-threads - same behavior.

Thanks.

In GNU Emacs 27.0.50 (build 1, x86_64-apple-darwin17.7.0, NS appkit-1561.60 Version 10.13.6 (Build 17G65))
 of 2018-10-15 built on fgunbin.playteam.ru
Repository revision: 3d91dc1bb5aeecda786ebe1805c33d14c8bd89fa
System Description:  Mac OS X 10.13.6

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