Re: MinGW build on master fails with Error 127

[Eli Zaretskii <eliz@gnu.org>]

> From: Óscar Fuentes <ofv@wanadoo.es>
> Cc: emacs-devel@gnu.org
> Date: Sat, 24 Dec 2022 20:19:24 +0100
> 
> Óscar Fuentes <ofv@wanadoo.es> writes:
> 
> >>> The commit message says "fclose fail during atexit as if they were
> >>> already closed" but indeed it doesn't describe a user-visible problem. I
> >>> can ask for more details, if you are interested.
> >>
> >> I am.
> >
> > Ok, I'll ask the patch author.
> 
> This is his answer:
> 
>   Afair it showed an error at exit and exited != 0.

Here's the source code of close_stream (after I removed the comments):

  int
  close_stream (FILE *stream)
  {
    const bool some_pending = (__fpending (stream) != 0);
    const bool prev_fail = (ferror (stream) != 0);
    const bool fclose_fail = (fclose (stream) != 0);

    if (prev_fail || (fclose_fail && (some_pending || errno != EBADF)))
      {
	if (! fclose_fail)
	  errno = 0;
	return EOF;
      }

    return 0;
  }

My questions are simple: which of the conditions for the error return
actually happened?  And what was the value of 'errno' (the code only
filters out EBADF)?