Re: 23.0.60; uid problems on w32

[Lennart Borgman (gmail)]

Eli Zaretskii wrote:
> > Date: Sun, 30 Mar 2008 17:27:59 +0200
> > From: "Lennart Borgman (gmail)" <address@hidden>
> > CC: Eli Zaretskii <address@hidden>, 
> >  Stefan Monnier <address@hidden>,
> >  address@hidden
> >
> > Jason Rumney wrote:
> > > Eli Zaretskii wrote:
> > > > I'm still clueless about why Cygwin shows 60830, while we show 50830.
> > > > Ideas, anyone?
> > > >   
> > > Cygwin adds 10000 to domain uid and gids to avoid clashes with local ids.
> > >
> > > http://cygwin.com/ml/cygwin-developers/2001-04/msg00048.html
> > > http://cygwin.com/ml/cygwin-patches/2001-q2/msg00043.html
> > But that does not happen in my case where id is 1003 both in 
> > server-ensure-safe-dir and cygwin id.
>
> That's because your uid is of a local user, not of a domain user.

Thanks.

> Domain users are defined by a prefix in the SID that is different from
> the prefix of the local machine.  The way we (and Cygwin) map SIDs to
> a uid is by throwing away the prefix and keeping only the last part --
> the so-called RID, the relative ID -- which is okay as long as the
> prefix is identical for all users.  But once users defined in the
> domain server come into play, you could have 2 different users -- one
> local, the other domain user -- with the same RID.  That is what
> Cygwin is trying to avoid.

But why is the prefix thrown away?