Re: Berkeley Packet Filter

[Thomas Bushnell BSG]

On Mon, 2009-07-06 at 21:01 +0800, Da Zheng wrote:
> Samuel Thibault wrote:
> > Da Zheng, le Mon 06 Jul 2009 14:23:20 +0800, a écrit :
> >   
> >> Thomas Schwinge wrote:
> >>     
> >>> Zheng Da asked me to tell him about previous work that has been done on
> >>> supporting and using Berkeley Packet Filters.  Here it is:
> >>> <http://www.bddebian.com/~hurd-web/open_issues/bpf/>
> >>>       
> >> GNU Savannah bug #25054 -- Kernel panic with eth-multiplexer, reported 
> >> by antrik, isn't a bug in gnumach.
> >> It was caused by a bug in eth-multiplexer and the bug has been fixed.
> >> Maybe you can remove it in the page.
> >>     
> >
> > Errrr, a bug in a userland tool is not supposed to cause a kernel panic,
> > so there is a bug in the kernel too.
> >   
> What should the kernel do if it is out of resources?

Cause the system call to return an error, at the very least.

But the old rule in Mach was that the system can't cope with a loss of
resources, and until that's fixed, a panic is better.