[Mimedefang] mimedefang shutdown signal handling

[Paul Whittney]

I'm convinced that I have made an error in the make script, or have an
issue with my perl install, but I thought I'd ask the list in case anyone
else has had this issue, and managed to fix it.

Using the init script with mimedefang (versions 2.39, 2.40, and 2.41) I
am able to start and stop the mimedefang processes (mainly because I'm
testing all sorts of perl scripts away from the main system), however,
mimedefang doesn't shutdown following the kill signal, but mimedefang
does not. I have tried killing the process manually, but I have to use
kill -9 <mimedefang process>.

I've got the sh -x output of the init-script (in the examples directory)
following a start.

mimedefang multiplexor starts up with:

/usr/local/bin/mimedefang-multiplexor -p \
/var/run/defang/mimedefang-multiplexor.pid -m 2 -x 7 \
-U defang -i 300 -b 600 -R 10000 -M 30000 -l -s \
/var/spool/MIMEDefang/mimedefang-multiplexor.sock

mimedefang-multiplexor.pid is 3598

/usr/local/bin/mimedefang -P /var/run/defang/mimedefang.pid -m \
/var/spool/MIMEDefang/mimedefang-multiplexor.sock -U defang -t \
-x MIMEDefang-2.41-ns2.redsky.net -p /var/spool/MIMEDefang/mimedefang.sock

mimedefang.pid is 3610

Looking at the process listing (I've removed a bit of info...)

UID        PID  PPID  C STIME TTY          TIME CMD
defang    3598     1  0 09:48 ? 00:00:00 /usr/local/bin/mimedefang-multiplexor 
defang    3599  3598 33 09:48 ? 00:00:13 /usr/bin/perl 
/usr/local/bin/mimedefang.pl -server
defang    3610     1  0 09:48 ? 00:00:00 /usr/local/bin/mimedefang 
defang    3611  3610  0 09:48 ? 00:00:00 /usr/local/bin/mimedefang 
defang    3612  3611  0 09:48 ? 00:00:00 /usr/local/bin/mimedefang 
defang    3613  3598 35 09:48 ? 00:00:13 /usr/bin/perl 
/usr/local/bin/mimedefang.pl -server

Then, issuing the stop command, I see the following in the sh -x output:
+ test -f /var/run/defang/mimedefang.pid
++ cat /var/run/defang/mimedefang.pid
+ kill 3610
+ RETVAL=0
+ '[' 0 = 0 ']'
+ echo '[  OK  ]'

and:

+ test -f /var/run/defang/mimedefang-multiplexor.pid
++ cat /var/run/defang/mimedefang-multiplexor.pid
+ kill 3598
+ RETVAL=0
+ '[' 0 = 0 ']'
+ echo '[  OK  ]'

but looking at the ps output:

UID        PID  PPID  C STIME TTY          TIME CMD
defang    3610     1  0 09:48 ?        00:00:00 /usr/local/bin/mimedefang 
defang    3611  3610  0 09:48 ?        00:00:00 /usr/local/bin/mimedefang 
defang    3612  3611  0 09:48 ?        00:00:00 /usr/local/bin/mimedefang 

I think I'm lacking the skills of debugging this, and if it's effecting
everyone, then people would notice old processes hanging around.

Anyone able to offer any hints on process debugging?

-Paul Whittney