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List:       freebsd-net
Subject:    userland shutdown(2)?
From:       Harry Schmalzbauer <freebsd () omnilan ! de>
Date:       2017-11-14 9:52:55
Message-ID: 5A0ABCF7.6080606 () omnilan ! de
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 Hello,

stoping jails leaves open sockets with no process attached.
(sockstat shows like this line:
?        ?          ?     ?  tcp6   2001:db8::fedc:389 2001:db8::abcd:15666
)

Since I make use of mount lines in jail.conf,
umounting the root filesystem of the jail fails because "device busy".
To avoid dirty filesystems after reboot of the host,
my modified rc.d/jail updates the corresponding filesystem
to be mounted readonly, but that's not a great solution.

I'd like to get all sockets killed before jail vanishes.

There's shutdown(2), which seems to do exactly what I want,
but where/how to implement?
Is there any userland tool utilizing shutdown(2)?

Thanks,

-Harry
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