yes, when i add "con=pts" it starts working in the background,
Thanks very much !


> Date: Fri, 2 Dec 2011 22:15:43 +0100
> Subject: Re: [uml-user] Can i run uml in the background ?
> From: riccardo.murri@gmail.com
> To: ningji@hotmail.com
> CC: user-mode-linux-user@lists.sourceforge.net
>
> Hi Ning Ji,
>
> On Fri, Dec 2, 2011 at 22:10, ning ji <ningji@hotmail.com> wrote:
> > but when i run
> >
> >  #sudo ./umlinux ubda=./fs6 mem=128M
> > eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51 &
> >
> > i got this
> >
> > [1]+  Stopped                 sudo ./umlinux ubda=./fs6 mem=128M
> > eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51
> >
>
> A programm running in the background must not attempt to perform any
> I/O to the terminal, otherwise it gets a STOP signal.
>
> If you want to run UML in the background you will have to: (warning: untested)
>
> 1) redirect the initial boot console output to a file:
>
> umlinux .... > boot.log
>
> 2) use the "con=..." option to start the Linux consoles in a XTerm, or
> network port, or anything that does not do I/O in the shell
> terminal.
>
> best regards,
> Riccardo