Re: getting user name from uid

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On Wed, Apr 11, 2007 at 06:40:59AM +0300, Kari Hurtta wrote:
> >>> Erik Mouw
> > On Tue, Apr 10, 2007 at 06:12:58PM +0300, Kari Hurtta wrote:
> > > (NFSv4 protocol passes usernames around. )
> > > 
> > > ( Documentation talks about id mapper daemon. )
> > 
> > Which runs in userspace because user *names* are a userspace thing.
> > 
> > The kernel doesn't care about usernames. The kernel only cares about
> > user IDs. The whole issue about usernames is because we poor humans are
> > much better in remembering names instead of numbers. That's why we have
> > DNS to resolve www.kernelnewbies.org to 74.92.59.67. That's why your
> > parents decided to call you "Kari Hurtta" instead of "6455243".
> 
> Well kernel NFSv4 code needs these usernames, because protocol uses 
> them.   So because NFS server and client are on kernel space, these
> usernames are no longer just userspace thing.

They still are. It's userspace that resolves them, not the kernel
reading /etc/passwd (or whatever method is used to to map usernames on
UIDs).


Erik

- -- 
They're all fools. Don't worry. Darwin may be slow, but he'll
eventually get them. -- Matthew Lammers in alt.sysadmin.recovery
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