Plan 9 from Bell Labs’s /usr/web/sources/plan9/rc/bin/dontkill

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


#!/bin/rc
# dontkill regexp - mark invoker's processes with names matching regexp
#	as not killable when the kernel runs out of memory
if (! ~ $#* 1) {
	echo $0 regexp >[1=2]
	exit usage
}
cd /proc
# see /sys/src/9/port/proc.c:/^killbig
pids=`{psu | awk '$NF ~ /'$1'/ {print $2}'}
~ $#pids 0 || chmod -w $pids^/ctl >[2]/dev/null

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