On Tue, Nov 16, 2010 at 01:33:53AM +0100, Ivan Voras wrote: > On 15 November 2010 18:10, Luigi Rizzo <[email protected]> wrote: > > > 2. [generic] passing pointers between userland and kernel > > requires remapping the pointer when going up or down. > > As the mapping would be application specific, i don't > > see much use in allowing room for a pointer without kernel code > > to map userland <-> kernel pointers. > > I'm not thinking of passing a *working* pointer into the kernel but > used as a cookie, similar to how it's used in kqueue: the intention > being the application can send and get a pointer which means something > to the application, not something usable to the kernel.
oh, but then you are thinking of something completely different. The SO_USER_COOKIE is never returned to the application; it is only passed to another kernel subsystem, so it must be significant there, not for the application. cheers luigi _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
