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
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