GNU bug report logs - #17036
Continuation for Emacs: invoking a process on exit?

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Reuben Thomas <rrt <at> sc3d.org>
Cc: 17036 <at> debbugs.gnu.org, schwab <at> linux-m68k.org, monnier <at> iro.umontreal.ca
Subject: bug#17036: Continuation for Emacs: invoking a process on exit?
Date: Wed, 19 Mar 2014 18:51:05 +0200

> Date: Wed, 19 Mar 2014 13:19:28 +0000
> From: Reuben Thomas <rrt <at> sc3d.org>
> Cc: Andreas Schwab <schwab <at> linux-m68k.org>, 17036 <at> debbugs.gnu.org
> 
> On 19 March 2014 13:10, Stefan <monnier <at> iro.umontreal.ca> wrote:
> 
> > > I could imagine a `restart-emacs' command having some small utility.
> >
> > Could the w32 build support something like POSIX's `exec'?
> 
> 
> Windows has execvp... http://msdn.microsoft.com/en-us/library/3xw6zy53.aspx

Don't believe the sales people.  MS's execvp is buggy, and even if we
forget about those bugs, it won't do what is expected here: it won't
keep the file descriptors open in the original process still open in
the overlaid process.  That's because there's no 'exec' system call on
Windows, so execvp is _emulated_: the original process simply invokes
the new one as its child process, and then immediately exits.

So the answer to Stefan is: no, this cannot be done on Windows, not
without some custom code to let the re-executed Emacs inherit all of
the file descriptors which were open in the original Emacs process.

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