Hi, On Mon, May 16, 2011 at 10:01:31AM +0200, Christoph Mitasch wrote: > the idea is actually good, but my experience is that modern Linux > distros are unable to shutdown with "kill -s INT/PWR".
Well. I consider the default setup of your "modern" Linux distros broken. So pressing Ctrl+Alt+Del on those does nothing? At all? > I tested on Debian Squeeze and Ubuntu Natty and it didn't work. What > distro are you using? Debian on Debian. Works out of the box. And just for the fun of it: For reference: On a "normal" system, the Linux kernel sends SIGINT to PID 1 when a "keyboard interrupt" (Ctrl+Alt+Del) is received. Search for ctrl_alt_del and kill_cad_pid in the kernel for details. What actually happens after PID 1 receives the signal is a policy decision. Let's see how different processes running as PID 1 handle this (I'm using Debian packages as reference, see those for versions): * sysvinit (2.88dsf-13.6) As seen in src/init.c, lines 2429-2441, this just runs the ctrlaltdel entry from /etc/inittab, which can be configured to shut down the container. * upstart (0.6.6-2): If I see this correctly, in init/main.c, line 453, there is a signal handle for SIGINT. There even is a default job file to handle this event at conf/control-alt-delete.conf. * systemd (25-2): The code to handle this is in src/manager.c, lines 2120-2132. This triggers ctrl-alt-del.target, which seems to be an alias for either halt, reboot or poweroff, maybe based on a symlink? * runit (2.1.1-6.2): Handler is in src/runit.c lines 38-41 and seems to trigger a state transition in lines 220-241. Looks sane. So it SEEMS that any "modern" init system should handle SIGINT just fine. If they don't, now would be a good time to find out why... Have a nice day, Tobias -- My blog: http://blog.23.gs/ GPG-Key 0xE2BEA341 - signed/encrypted mail preferred http://www.fli4l.de/ - ISDN- & DSL-Router on one disk! Registered FLI4L-User #00000003
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