I noticed this when testing how signal handling worked in fw_update, it
turns out that if you `pkill -KILL -f fw_update` it may leave behind a perl
process that is locking the package database. Instead of just waiting
to be killed, we can have that process check to see if its parent is
still around and exit if not.
Is there a more appropriate solution to this?
What's the right way to notice your parent exited?
Comments, OK?
Index: fw_update.sh
===================================================================
RCS file: /cvs/src/usr.sbin/fw_update/fw_update.sh,v
retrieving revision 1.44
diff -u -p -r1.44 fw_update.sh
--- fw_update.sh 12 Dec 2022 02:30:51 -0000 1.44
+++ fw_update.sh 23 Aug 2023 02:47:54 -0000
@@ -221,10 +221,15 @@ lock_db() {
$|=1;
+ $0 = "fw_update: lock_db";
lock_db(0);
say $$;
- sleep;
+
+ # If our parent exits unexpectedly,
+ # ppid will become init and we should exit.
+ my $parent = getppid;
+ sleep 1 while getppid == $parent;
EOL
set +o monitor
