> > We should leave EFAULT in the man page, and we should clarify that we
> > reserve the right to change the implementation in the future.
> > 
> > The difference between getting EFAULT and getting SIGSEGV/SIGBUS is
> > purely an implementation artifact.
> 
> Well, EFAULT can't be returned by pipe(2) currently. So it seems
> wrong to document it as possible return value in manpage.

you miss the point.

we want to reserve the right for pipe(2) to possibly return EFAULT in
the future.

						- Bill