maxusers in config file (4BSD)

[James Matheson]

Ed Gould writes
> In order to comply with AT&T's restrictions on binary licenses, we've
> added a maxusers() system call that returns the value from the
> config maxusers parameter.  The limit is enforced by login(1),
> by counting the numbers of entries in /etc/utmp.

This will only work if the login process used actually updates
utmp. People could get round this by writing their own /bin/login
without this feature and hey presto no limit!