rc script: manual stop vs system shutdown

[Andriy Gapon]

On 01/08/2019 21:53, Freddie Cash wrote:
> On Thu, Aug 1, 2019, 11:15 AM Andriy Gapon, <avg at freebsd.org
> <mailto:avg at freebsd.org>> wrote:
> 
>     On 01/08/2019 19:12, Warner Losh wrote:
>     >
>     >
>     > On Thu, Aug 1, 2019, 10:53 AM Rodney W. Grimes
>     > <freebsd-rwg at gndrsh.dnsmgr.net
>     <mailto:freebsd-rwg at gndrsh.dnsmgr.net>
>     <mailto:freebsd-rwg at gndrsh.dnsmgr.net
>     <mailto:freebsd-rwg at gndrsh.dnsmgr.net>>>
>     > wrote:
>     >
>     >     >
>     >     > Is it possible in an rc script to distinguish between a
>     manual stop
>     >     > (e.g., service foo stop) and a stop during a system shutdown
>     (via
>     >     > rc.shutdown) ?
>     >     > Are there any marker variables for that?
>     >     > Or something in the global system state?
>     >
>     >     Not that I can think of, but I like this idea,
>     >     I am sure that use cases exist.
>     >
>     >
>     > What is the use case that needs to disambiguate the two cases...
> 
>     I have one use case in mind and it's a truly special case.
>     I want rc.d/watchdogd to gracefully stop watchdogd and to disable the
>     watchdog timer when the stop action is requested manually.  And I want
>     it to stop watchdogd and set the watchdog timer to a special shutdown
>     timeout during the shutdown.  If the special timeout is configured, of
>     course.
> 
> 
> A horribly hackish workaround could be to do a "pgrep shutdown" and
> "pgrep reboot" and "pgrep halt" in the stop function of the RC script.
> If one of those those processes exist, then a system shutdown/reboot is
> in progress.
> 
> Not elegant, but could be workable until something nicer is added.

I think that shutdown by default sends a signal to init and exits.
It's init that kicks off rc.shutdown.


-- 
Andriy Gapon