[PATCH 0/2] Send a SIGCHLD to the init's pid namespace parent when reboot

Greg Kurz gkurz at fr.ibm.com
Tue Aug 23 07:09:26 PDT 2011

On Tue, 2011-08-23 at 15:33 +0200, Oleg Nesterov wrote:
> [...]
> At least now I understand why did you mention si_code/CLD before. You
> meant waitid(). I thought you were talking about the death-notifications
> which can't report CLD_ you need.
> I strongly object. We shouldn't uglify wait_task_zombie() to solve the
> very specific problem.
> And once again. sub_init->parent does wiat(&status) and sees
> WIFSIGNALED() && WTERMSIG(status) == SIGHUP. This can only mean that
> sys_reboot(LINUX_REBOOT_CMD_RESTART) was called. It _can not_ be really
> killed by SIGHUP, it must be CMD_RESTART.
> Why this can't work? Why do you want the additional complications?

I don't see either what could go wrong with you approach. It doesn't
mess with critical wait() or signal paths. It's definitely the way to


Gregory Kurz                                     gkurz at fr.ibm.com
Software Engineer @ IBM/Meiosys                  http://www.ibm.com
Tel +33 (0)534 638 479                           Fax +33 (0)561 400 420

"Anarchy is about taking complete responsibility for yourself."
        Alan Moore.

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