GNU bug report logs - #16152
ptys on MS Windows

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Christopher Wellons <wellons <at> nullprogram.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; Windows Emacs crash from pty EOF
Date: Sat, 14 Dec 2013 21:48:17 -0500

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The following expression causes Emacs to crash in Windows 7 (and
probably other versions) with Emacs 24.3.1:

     (with-temp-buffer
       (start-process "crash-emacs-bug" (current-buffer) nil)
       (process-send-eof))

The `start-process' call here is creating a pty process (according to
the docstring). The exact version string is (official GNU build):

    GNU Emacs 24.3.1 (i386-mingw-nt6.1.7601) of 2013-03-17 on MARVIN

This issue was originally discovered here:

https://github.com/skeeto/skewer-mode/issues/38

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Message #8 received at 16152 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Christopher Wellons <wellons <at> nullprogram.com>
Cc: 16152 <at> debbugs.gnu.org
Subject: Re: bug#16152: 24.3; Windows Emacs crash from pty EOF
Date: Sun, 15 Dec 2013 20:42:20 +0200

> From: Christopher Wellons <wellons <at> nullprogram.com>
> Date: Sat, 14 Dec 2013 21:48:17 -0500
> 
> The following expression causes Emacs to crash in Windows 7 (and
> probably other versions) with Emacs 24.3.1:
> 
>      (with-temp-buffer
>        (start-process "crash-emacs-bug" (current-buffer) nil)
>        (process-send-eof))
> 
> The `start-process' call here is creating a pty process (according to
> the docstring). The exact version string is (official GNU build):
> 
>     GNU Emacs 24.3.1 (i386-mingw-nt6.1.7601) of 2013-03-17 on MARVIN

PTYs are not supported on MS-Windows.  I added some protection so that
Emacs doesn't crash (trunk revision 115538), but I doubt if Emacs will
do anything useful when start-process is called that way on Windows.

> This issue was originally discovered here:
> 
> https://github.com/skeeto/skewer-mode/issues/38

I don't use skeeto, so I have no idea what it tries to do in this
case.  So I cannot offer any advice for how to make skeeto work on
Windows in this case, nor tell if that is even possible.

Message #17 received at 16152-done <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: 16152-done <at> debbugs.gnu.org
Cc: Christopher Wellons <wellons <at> nullprogram.com>
Subject: bug#16152: 24.3; Windows Emacs crash from pty EOF
Date: Tue, 14 Jun 2016 21:56:22 -0400

Closing, as I don't see any reason to leave this open. OP reported a
crash scenario which was fixed; ptys can't be implemented on Windows
because Windows doesn't provide support for such a thing.

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