Re: master 3b4e312: Improve documentation around standard error pipes (Bug#35328).

[Eli Zaretskii]

> From: Michael Albinus <address@hidden>
> Date: Mon, 22 Apr 2019 22:59:01 +0200
> Cc: Philipp Stephani <address@hidden>
> 
> > address@hidden standard error process
> > +If @var{stderr} is a buffer, Emacs will create a pipe process, the
> > address@hidden error process}.  This process will have the default
> > +filter (@pxref{Filter Functions}), sentinel (@pxref{Sentinels}), and
> > +coding systems (@pxref{Default Coding Systems}).  On the other hand,
> > +it will use @var{query-flag} as its query-on-exit flag (@pxref{Query
> > +Before Exit}).  It will be associated with the @var{stderr} buffer
> > +(@pxref{Process Buffers}) and send its output (which is the standard
> > +error of the main process) there.
> 
> FTR, the implementation in Tramp is different from what is described
> here. And honestly, I even don't know, how to implement these two
> processes for the remote case.
> 
> The current implementation in Tramp redirects stderr to a temporary
> file, if it is separate from stdout. This temprary file is associated
> with the :stderr buffer, and it runs auto-revert-mode. Maybe not very
> elegant, but working so far.
> 
> I don't know whether we shall document this different behavior, or
> whether we shall find an implementation in Tramp for what is
> described. For the latter, I would need help, as said. Or at least ideas.

I think we should at least qualify the above description with its
being accurate for local processes only.