Re: Let init know user wants to shutdown

Kurt Roeckx
2001-04-10T23:38:59Z

On Tue, Apr 10, 2001 at 11:20:24PM +0000, Miquel van Smoorenburg wrote:
>
> the shutdown scripts
> include "kill -15 -1; sleep 2; kill -9 -1". The "-1" means
> "all processes except me". That means init will get hit with
> SIGTERM occasionally during shutdown, and that might cause
> weird things to happen.

-1 mean everything but init.

>From the manpage:

If pid equals -1, then sig is sent to every process except
for the first one, from higher numbers in the process
table to lower.

And later:

BUGS
It is impossible to send a signal to task number one, the
init process, for which it has not installed a signal han-
dler. This is done to assure the system is not brought
down accidentally.

Kurt