Re: runit SIGPWR support

From: Jeff <sysinit_at_yandex.com>
Date: Mon, 16 Mar 2020 13:49:04 +0100

25.02.2020, 10:08, "Jonathan de Boyne Pollard" <j.deboynepollard-newsgroups_at_ntlworld.com>:
>>   Of course, but once the fd is closed, /dev/console should not have
>>  any impact on the process, so would a kbrequest still reach it?
>
> Yes. First: This is a kernel virtual terminal thing not a console
> thing. Strictly speaking, it is doing it wrongly to access it through
> the console device, which is not necessarily a KVT. Second: The
> mechanism does not require an open file descriptor. It requires that
> the target process never terminate, because there's no symmetrical
> kernel API function to disable the mechanism once it has been enabled,
> but it does not require that that process have any particular file
> descriptors open.

so /dev/tty0 should be open(2)ed instead of /dev/console since it is
the tty master.

and again:
will the by the ioctl(2) call achieved arrangement survive exec chaining
into another binary (the stage2 executable s6-svscan in case of s6) ?
Received on Mon Mar 16 2020 - 12:49:04 UTC