i tried to understand this behaviour
it seems the way perl handle process name update ($0) has changed
http://perldoc.perl.org/5.14.0/perldelta.html
Assignment to $0 sets the legacy process name with prctl() on Linux
On Linux the legacy process name is now set with prctl(2), in addition
to altering the POSIX name via argv[0] , as Perl has done since version
4.000.
Now system utilities that read the legacy process name such as ps, top,
and killall recognize the name you set when assigning to $0 . The string
you supply is truncated at 16 bytes; this limitation is imposed by Linux.
it seems to disturb init.d script which use --name MailScanner option to
check if the daemon is running
Check for processes with the name process-name (according to
/proc/pid/stat).
but this file does not contain MailScanner but a longer string for
example for the process " MailScanner: master waiting for children,
sleeping"
21283 (MailScanner: ma) ...
with previous perl version, it contains 14302 (MailScanner) ...
so init.d script considers always MailScanner is not running:
- stop doesn't work
- start will launch a new daemon instance each time it is called
(especially via /etc/cron.daily/mailscanner)
so init.d script should be fixed to use another method to find daemon
instance (may be using /var/run/MailScanner/MailScanner.pid)
# start-stop-daemon -v --start --startas MailScanner --name MailScanner
--test
Would start MailScanner .
v# start-stop-daemon -v --start --startas MailScanner --pid
/var/run/MailScanner/MailScanner.pid --test
process already running.
sample init.d diff
86a87
> PIDFILE=`${QUICKPEEK} 'PID file' ${CONFFILE}`
102c103
< start-stop-daemon --start --quiet --startas $STARTAS --name
$NAME --test > /dev/null \
---
> start-stop-daemon --start --quiet --startas $STARTAS --pidfile
"$PIDFILE" --test > /dev/null \
104c105
< start-stop-daemon --start --quiet --nicelevel $run_nice --exec
$DAEMON --name $NAME -- $DAEMON_ARGS \
---
> start-stop-daemon --start --quiet --nicelevel $run_nice --exec
$DAEMON --pidfile "$PIDFILE" -- $DAEMON_ARGS \
126c127
< start-stop-daemon --stop --quiet --retry=TERM/10/TERM/20 --name
$NAME
---
> start-stop-daemon --stop --quiet --retry=TERM/10/TERM/20
--pidfile "$PIDFILE"
143c144
< start-stop-daemon --stop --signal 1 --quiet --name $NAME
---
> start-stop-daemon --stop --signal 1 --quiet --pidfile "$PIDFILE"
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