Question on locking of useradd instances.

["A. Konstam" <akonstam trinity edu>]

Has anyone come up against and solved this problem. We have a
network of computers where a user can add an account for
himself on the linux server through Windows and Samba.

Now the problem is that sometimes multiple students (users) try
to add their accounts at the same time. We would like the
script that adds users to be able to lock out other instances
of itself when this race condition occurs. 

Has any one done this already or has some hints on the easiest
way to do it? If you would be willing to share your solution
that would be great.
-- 
-------------------------------------------
Aaron Konstam
Computer Science
Trinity University
715 Stadium Dr.
San Antonio, TX 78212-7200

telephone: (210)-999-7484
email:akonstam trinity edu