Publically writable directories

[ig25 () mvmampc66 ciw uni-karlsruhe de (Thomas Koenig)]

Is there a safe way of opening a temporary file in a publically writable
directory as a normal user, given a system with symbolic links?
I'm even willing to assume a sticky bit on the directory.

Main problem: How do I disallow a malicious

$ ln -s /tmp/some.file $MYHOME/.somedotfile

at the wrong times, without getting into race conditions?
--
Thomas Koenig, Thomas.Koenig () ciw uni-karlsruhe de, ig25@dkauni2.bitnet.
The joy of engineering is to find a straight line on a double
logarithmic diagram.