httpd logout

[Coleman Brumley]

Does anyone have an idea of how I could determine an httpd logout?

I'm using Basic Auth, and would like to determine when a user logs out.  
For example, a user logs in and modifies something using a CGI page.  In 
this case, I have "/cgi-bin:user:password" in my httpd.conf.  Is there a 
way, our could someone recommend a way, to determine if "user" has 
become inactive for, say, 10 seconds?  As a test, I tried using 
SIGALARM, but in hind sight that won't work because of the forked 
handling of connections.