[systemd-devel] Sending a SIGABRT to PID1

[Mantas Mikulėnas]

On Mon, May 4, 2015 at 3:40 AM, Lennart Poettering <lennart at poettering.net>
wrote:

> On Sun, 03.05.15 19:10, Mantas Mikulėnas (grawity at gmail.com) wrote:
>
> > On Sun, May 3, 2015 at 6:54 PM, Víctor Fernández <vfrico at gmail.com>
> wrote:
> >
> > > Ok, Thanks for your reply.
> > >
> > > But, just out of curiosity, why init process gets down with a SIGABRT
> and
> > > not with a SIGKILL (9), being this a signal which cannot be caught,
> blocked
> > > or ignored?
> > >
> >
> > pid 1 is allowed to catch SIGKILL, and usually does so, so that you can
> > sigkill everything (e.g. Alt+SysRq+I) and still have a working system
> > afterwards.
>
> Hmm, it is allowed to do catch SIGKILL? That would be news to me, and
> systemd certainly doesn't. Do you have any reference?


I'm not sure exactly. It *seems* I was wrong; the comment in the source
says "init gets no signals it doesn't want" (i.e. no custom handler), but
doesn't actually allow installing a handler for SIGKILL.

-- 
Mantas Mikulėnas <grawity at gmail.com>
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