[bug-diffutils] bug#19509: bug#19509: [PATCH] diff: treat fifos as identical

[Ondřej Svoboda]

I also posed this question to myself -- how can we tell two fifos apart? 
Do they by any chance store e.g. a file descriptor when they are being used?

I am not aware of any comparison done to fifos but I may as well be wrong.

On 12.2.2015 00:30, Paul Eggert wrote:
> Ondřej Svoboda wrote:
> >       }
> > +      else if (S_ISFIFO (cmp.file[0].stat.st_mode)
> > +               && S_ISFIFO (cmp.file[0].stat.st_mode))
> > +    {
> > +      /* Both are fifos.  */
> > +    }
>
> If they're the *same* fifo, they should compare the same (and already 
> do, if I'm not mistaken).  But if they're *different* fifos?