On martedì 12 giugno 2007, Sylvain Beucler wrote: > On Mon, Jun 11, 2007 at 09:26:12PM +0000, Paolo Giarrusso wrote: > > /bin/bash is running with stding and stdout attached to > > /dev/console, and on /dev/console ignores Ctrl-* (and that's on > > purpose, and not UML specific). Possibly just the terminal emulator > > is noticing the press of Ctrl-C, or it's /dev/console itself. > > That explains my problem, thanks. Do you know why that is (maybe so > that 'init' cannot be killed from keyboard)? > > > If you run the open or openvt command, it will run bash on > > /dev/ttyXXX and there, you'll see that Ctrl-C works. > > Alas that doesn't seem to work from rootfstype: > # openvt /dev/tty0 > Couldnt get a file descriptor referring to the console > Could not get a file descriptor referring to the console
That may mean that /dev/console couldn't be opened, which is actually reasonable (on my system it's owned by root with perms 0600). Making that usable from uml would bypass this problem (and reads/writes to it from UML wouldn't get to the host), but it's not a long-term solution - you can maybe debug the problem with strace (probably /dev/console is just opened to switch to the new console). > I also tried > # tty > /dev/console > # exec < /dev/tty0 > /dev/tty0 2>/dev/tty0 > # tty > /dev/tty0 > > But that actually doesn't help. > > I'll try to isolate what getty does, as Jeff suggested; apparently it > registers some signals as well. I suggested openvt for this - this area is related to session and process group management, and involves things like setsid(1) (and setsid(2)) and management of the controlling tty (I don't know the tiny details). -- Inform me of my mistakes, so I can add them to my list! Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
