On Thursday 21 September 2006 10:01, Lee Cartwright wrote: > Hi everyone, > > I am looking into user mode linux to help with some testing, however I'm > not sure if it is capable of doing quite what I need. I have a couple of > questions that I was hoping you could answer.
> 1) Is it possible for an instance of user mode linux to simulate the use > of a piece of hardware that is not present on the host Linux machine? > eg. Run an application in user mode linux that accesses something like a > DMA controller that is not present in the host. If so what is the best > way of doing this? It is possible - the application only talks with a device driver normally (except X.org), so it is possible to write a "faking" driver in the Linux kernel (though it ain't necessarily easy - it is kernel code anyway). There is a project for a fake WiFi interface written like this. Maybe you can use HPPFS if the interface is only through proc - it exports a fake /proc controlled by a simpler Perl daemon (about 100-200 lines of code IIRC) on the host. > 2) Is it possible for an application running on the host Linux machine > to communicate with an application running on a user mode linux instance > using something like a pipe or socket? You can use a regular network socket - nothing else is currently implemented (and IMHO extending _local_ communication to two _different_ kernel instances would not work - what if a process wants to pass an fd, or send a signal to the other side?) -- Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
