From: Petr Baudis <pasky@ucw.cz>
Date: Mon, 18 Apr 2005 01:48:58 GMT
Subject: Re: [4/5] Add option for hardlinkable cache of extracted blobs
Message-ID: <20050418014858.GI1461@pasky.ji.cz>
In-Reply-To: <20050417183508.15beb1fd.pj@sgi.com>

Dear diary, on Mon, Apr 18, 2005 at 03:35:08AM CEST, I got a letter
where Paul Jackson <pj@sgi.com> told me that...
> Petr wrote:
> > The documentation I've got says:
> > 
> > "R_OK,  W_OK  and  X_OK request checking whether the file exists and has
> >  read, write and execute permissions, respectively.  F_OK just requests
> >  checking for the existence of the file."
> 
> You don't exactly say it, but I'm guessing that you think that this
> documentation is stating that F_OK checks for the existance of the file
> _regardless_ of path access permissions.
> 
> No so.  Write your own little test program, and/or read the kernel source.
> 
> Even if the file exists, if its directory entry is not accessible to the
> _real_ uid/gid, access F_OK will fail.  If the problem is a lack of
> seach permissions on some directory in the path, the errno will be
> EACCES.

Ok, I stand corrected; and when giving the access(2) manual page a
second look, it could imply that too. It has some room for more
crystal-clearness, though. ;-)

Thanks,

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
C++: an octopus made by nailing extra legs onto a dog. -- Steve Taylor