Adding setloginclass(2) and getloginclass(2).

Robert Watson rwatson at
Tue Mar 1 22:12:08 UTC 2011

On Tue, 1 Mar 2011, Edward Tomasz Napierała wrote:

> At, you can find a patch 
> that adds login class information to the kernel.  The patch does not contain 
> changes to autogenerated files; to test it, do "make sysent" in sys/kern/ 
> and sys/compat/freebsd32/.
> The patch itself doesn't add much user-visible functionality, although being 
> able to do "ps aux -o class" might be useful.  However, login classes are a 
> prerequisite for RCTL, aka Resource Containers - system administrator can 
> use rules such as "loginclass:users:nproc:deny=100/user", to replace 
> resource limits usually defined in login.conf(5), or use rule such as 
> "loginclass:users:nproc:deny=100/loginclass", to limit the number of 
> processes for the whole login class, achieving something similar to SunOS 
> "projects".
> Since this involves adding two new syscalls, I'd like to hear some opinion 
> about it - it's hard to change these afterwards.

Could you say a little about how you hande jails/chroots/etc?


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