Re: Linux-2.6.11 can't disable CAD

[Daniel Jacobowitz <dan@debian.org>]

On Thu, Apr 07, 2005 at 04:50:32PM -0400, Richard B. Johnson wrote:
> On Thu, 7 Apr 2005, Jan Harkes wrote:
> 
> >On Thu, Apr 07, 2005 at 11:16:14AM -0400, Richard B. Johnson wrote:
> >>In the not-too distant past, one could disable Ctl-Alt-DEL.
> >>Can't do it anymore.
> >...
> >>Observe that reboot() returns 0 and `strace` understands what
> >>parameters were passed. The result is that, if I hit Ctl-Alt-Del,
> >>`init` will still execute the shutdown-order (INIT 0).
> >
> >Actually, if CAD is enabled in the kernel, it will just reboot.
> >If CAD is disabled in the kernel a SIGINT is sent to pid 1 (/sbin/init).
> >
> 
> No, that's not how it ever worked. There are parameters that are
> available in the reboot-system call that define the operation that
> will occur when the 3-finger salute occurs.
> 
> Execute man 2 reboot.

Take your own advice.  From the man page:

       LINUX_REBOOT_CMD_CAD_ON
              (RB_ENABLE_CAD, 0x89abcdef).  CAD is enabled.  This means
              that the CAD keystroke will immediately cause the action
              associated with LINUX_REBOOT_CMD_RESTART.

       LINUX_REBOOT_CMD_CAD_OFF
              (RB_DISABLE_CAD, 0).  CAD is disabled. This means that the CAD
              keystroke will cause a SIGINT signal to be sent to init
              (process 1), whereupon this process may decide upon a
              proper action (maybe: kill all processes, sync, reboot).

-- 
Daniel Jacobowitz
CodeSourcery, LLC