From: Paul Jackson <pj@sgi.com>
Date: Mon, 18 Apr 2005 01:35:08 GMT
Subject: Re: [4/5] Add option for hardlinkable cache of extracted blobs
Message-ID: <20050417183508.15beb1fd.pj@sgi.com>
In-Reply-To: <20050417201856.GJ1461@pasky.ji.cz>

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.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@engr.sgi.com> 1.650.933.1373, 1.925.600.0401