On Tue, 16.07.13 20:19, Ramkumar Ramachandra (artag...@gmail.com) wrote: > > Lennart Poettering wrote: > > Similar story here. systemd-vconsole-setup is actually conditionalized > > on ConditionPathExists=/dev/tty0, i.e. will only run on systems where > > the VT is actually built into the kernel, and skipped on all others. If > > UML has not useful VT I'd recommend compiling it out of the kernel. > > A couple of questions: > > 1. Doesn't /dev/tty0 correspond to the "current" terminal, whether > it's a virtual console or /dev/console? Or should /dev/tty0 only ever > correspond to a virtual console, and is um Linux doing it wrong? > Should this condition be changed to /dev/tty1?
/dev/tty0 always points to the foreground VC tty. Are you saying UML provides /dev/tty0 but not /dev/tty1, /dev/tty2, ...? I am pretty sure that UML should be fixed to provide neither or both, evertyhing else is broken. Also the kernel docs on /dev/tty0 here: https://www.kernel.org/doc/Documentation/devices.txt > 2. What if I created /dev/tty0 using mknod? We don't support that. There are only two ways how device nodes are created these days: A) by the kernel in devtmpfs/devpts/... B) by udev/kmod/tmpfiles based on the modalias data of kernel modules (Well, and there's /dev/lp0 which is created without the modalias stuff but that's just because nobody wants to fix that old parallel port mess). > I found this in Documentation/devices.txt, although I'm not sure what > fb devices have to do with virtual consoles (there is no /dev/fb0 in > um Linux though): > > /dev/tty0 is the device that should be used to access the system video > card on those architectures for which the frame buffer devices > (/dev/fb*) are not applicable. Do not use /dev/console > for this purpose. /dev/console is an alias for the system console for whatever that means. It could point to the VC system, and usually does, but it frequently instead points to a serial TTY. /dev/tty0 however is always the VC, and as the docs say if you have no fb device, then tty0 is how you can access the video card -- and not /dev/console, as that might point to a serial terminal. Lennart -- Lennart Poettering - Red Hat, Inc. _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
