Sendmail Upgrade, new thread

[Glenn Steen]

On 11/04/06, Scott Silva <ssilva at sgvwater.com> wrote:
> Roger Jochem spake the following on 4/11/2006 8:53 AM:
> > The command is really flock, in lines 30 and 219 of the script. I
> > attached the file to this e-mail. I just need to change these two commands?
> >
> > Regards
> >
> > Roger Jochem
> >
> > ----- Original Message ----- From: "Glenn Steen" <glenn.steen at gmail.com>
> > To: "MailScanner discussion" <mailscanner at lists.mailscanner.info>
> > Sent: Tuesday, April 11, 2006 12:40 PM
> > Subject: Re: Sendmail Upgrade, new thread
> >
> >
> >> On 11/04/06, Roger Jochem <roger at rudnick.com.br> wrote:
> >>> Hello all!
> >>>
> >>> I finally found the problem with my mail server with messages sended
> >>> with an
> >>> empty body (problem related in the e-mail bellow).
> >>>
> >>> Turn's out that MailScanner is fine, sendmail is fine,  and the
> >>> problem was
> >>> with Mailwatch.
> >>>
> >>> There is a php script in /usr/local/bin called "mailq" that reads the
> >>> mail
> >>> queue to show in Mailwatch frontend. This script runs every minute,
> >>> and it
> >>> locks the messages (sometimes), and because of that MailScanner sends
> >>> the
> >>> empty messages (with the locking error) and then after that the normal
> >>> (full) message. I turned that script off and now everything is working
> >>> fine... What a fight...
> >>>
> >>> Is there something I have to do with that script to make it run with
> >>> sendmail 8.13 ?
> >>>
> >>> Regards
> >>>
> >>> Roger Jochem
> >>>
> >> Seems that script is using flock for locking, not lockf (posix). So
> >> Steve (or *someone*) might have something to do there:-). Usual
> >> disclaimer applies: I might be reading the code wrong;).
> >>
> >> --
> >> -- Glenn
> >> email: glenn < dot > steen < at > gmail < dot > com
> >> work: glenn < dot > steen < at > ap1 < dot > se
> >> --
> >> MailScanner mailing list
> >> mailscanner at lists.mailscanner.info
> >> http://lists.mailscanner.info/mailman/listinfo/mailscanner
> >>
> >> Before posting, read http://wiki.mailscanner.info/posting
> >>
> >> Support MailScanner development - buy the book off the website!
> That command seems to only lock only itself to keep multiple copies of the
> program from running.
> QUOTE
>         // Prevent multiple copies running
> $fl = fopen("/var/run/mailq.lock", "w+");
> // Attempt to create an exclusive lock - continue if successful
> if(flock($fl, LOCK_EX + LOCK_NB)) {
>
> /QUOTE
> It opens a lock file, and if it succeeds, it runs. If it can't open the lock
> file for write ("w+"), the program assumes it is already running. That way if
> it is fired every minute, but a large queue keeps the previous run open for
> more than that minute it won't run again.
> BTW, I think it should only run every 5 minutes. I think that is a symptom,
> not a cause.
> I, and many other people, are running that very script with no problems.
> Are you running a distro supplied version of sendmail, or did you get it from
> "outside the chain"?
>
Quite right.... Dangers of looking at code "in a hurry":-).


--
-- Glenn
email: glenn < dot > steen < at > gmail < dot > com
work: glenn < dot > steen < at > ap1 < dot > se