Date: Sat, 22 Jun 1996 12:31:03 -0400 (EDT) From: Brian Tao <taob@io.org> To: FREEBSD-QUESTIONS-L <freebsd-questions@freebsd.org>, FREEBSD-HACKERS-L <freebsd-hackers@freebsd.org> Cc: brian@mediacity.com Subject: Killing "unkilliable" processes waiting to drain tty Message-ID: <Pine.NEB.3.92.960622122302.9476C-100000@zap.io.org>
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Way back in the mists of time, Brian Litzinger wondered how one
would go about killing a process that was stuck waiting for its tty to
drain when exiting. Processes like that would look something like this:
taob 18335 0.0 0.0 772 16 p6- IEs+ 15Jun96 0:00.31 -tcsh (tcsh)
taob 16294 0.0 0.0 776 12 pe- IEs Sat05PM 0:00.29 (tcsh)
taob 16315 0.0 0.0 1888 16 pe- IE+ Sat05PM 0:00.46 (pine392)
You could kill -9 them all you want, but they would not go away.
I didn't see any resolution to the immediate question of "How do I get
rid of these processes, besides rebooting?" (search for
"indestructible processes" in the freebsd-questions archives), and the
problem still exists in the latest 2.2-SNAP.
Anyhow, to make a long story short, try this:
cat < /dev/ttyXX # replace XX as appropriate
I don't know why I didn't try this before... it seems so
blindingly obvious now. I was able to recover 7 tty's from a dozen
stuck processes today. Phew.
--
Brian Tao (BT300, taob@io.org, taob@ican.net)
Systems and Network Administrator, Internet Canada Corp.
"Though this be madness, yet there is method in't"
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