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Date: Sat, 15 Jan 2005 11:35:28 -0500
From: Kris Maglione <bsdaemon@comcast.net>
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Subject: Re: non-killable process
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Simon L. Nielsen wrote:

>On 2005.01.12 10:26:41 +0100, Divacky Roman wrote:
>  
>
>>hi,
>>
>>I have CFLAGS=-Os (dunno if it matters) compiled ports/net/iftop. and whenever
>>I run it on recent 6-current it "hangs":
>>  880  v4  R+     0:00.05 iftop
>>(ps ax output)
>>
>>and it cannot be killed - I can repeat it, so this might reveal some bug. I use
>>sched_ule.
>>
>From 
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/basics-daemons.htm

SIGKILL can not be ignored by a process. This is the ``I do not care 
what you are doing, stop right now'' signal. If you send SIGKILL to a 
process then FreeBSD will stop that process there and then[1].

[1]

Not quite true--there are a few things that can not be interrupted. For 
example, if the process is trying to read from a file that is on another 
computer on the network, and the other computer has gone away for some 
reason (been turned off, or the network has a fault), then the process 
is said to be ``uninterruptible''. Eventually the process will time out, 
typically after two minutes. As soon as this time out occurs the process 
will be killed.