[Mimedefang] Mimedefang sometime doesn't timeout Mail::SpamAssassin::Timeout parts in SA plugins
David F. Skoll
dfs at roaringpenguin.com
Thu Apr 13 10:29:41 EDT 2006
Martin Blapp wrote:
> This Plugin works in Spamassassin, but in mimedefang sometimes some of
> the timeouts get ignored.
Does it work if you disable the embedded Perl feature?
> I suspect that some signal problems between Mdefang and SA. Maybe Mdefang
> ignores some signals and SA doesn't receive anything back. Btw, I'm using
> embedded perl 5.8.8.
The multiplexor sets actions for SIGINT, SIGHUP and SIGTERM, which shouldn't
affect SA. It also sets a SIGCHLD action, but all of these handlers
are reset when it forks a slave:
sigprocmask(SIG_BLOCK, &sigs, NULL);
Timeouts in SpamAssassin are (to the best of my recollection) implemented
with SIGALRM, which by itself is evidence of scariness, but I don't think
MIMEDefang should affect SA.
> # Or do something that loads this slave a lot !
> dbg("bugtest: Before sleep of 100 seconds");
> system("sleep 100");
> dbg("bugtest: After sleep of 100 seconds");
This is an excerpt from the Linux alarm() man page:
sleep() may be implemented using SIGALRM; mixing calls to alarm() and
sleep() is a bad idea.
I'm not sure if this is true on FreeBSD, but maybe try implementing
your 100-second wait with something like this:
select(undef, undef, undef, 100);
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