shutdown_nice during boot

Andriy Gapon avg at
Thu May 7 08:03:56 UTC 2009

on 07/05/2009 11:00 peterjeremy at said the following:
> On 2009-May-06 19:24:03 +0300, Andriy Gapon <avg at> wrote:
>> It's possible to re-enable SIGINT right after init is forked, but
>> this way it will be delivered to init before it installs signal
>> handlers and thus init would simply terminate resulting in "Going
>> nowhere without my init!" panic.
> The best option would seem to be for init(8) to call sigprocmask(2)
> immediately it starts up and block all signals.

But a signal still can be delivered after init is exec-ed and before
sigprocmask(2) is called or not?

> This causes signals
> to be deferred until they are unblocked.  Once it sorts out its signal
> handlers, it can then unblock the signals - at which point it will
> receive any signals that were sent in the interim.
> Note that I haven't looked into init(8) to see if there are other
> reasons why this approach would not be appropriate

Andriy Gapon

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