bug#51177: 29.0.50; stop-process on pipes

[Helmut Eller]

On Fri, Nov 12 2021, Helmut Eller wrote:

> I do wonder why the part of the code with the comment "If process is
> still active, read any output that remains" is not executed for the
> deleting_process.  It seems to me that this creates the possibility (with
> very low probability) that we forget to read the last chunk of output in
> the usual case where filter ≠ t.

I see now why.  The Fdelete_process uses (p->infd >= 0) to decide if it
should call status_notify.  I guess this is pretty much a show stopper
as this will result in an endless recursion when delete-process is
called from a sentinel without closing the file descriptors first.

Helmut