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Re: [Nmh-workers] Truncated Email.
From: |
Ralph Corderoy |
Subject: |
Re: [Nmh-workers] Truncated Email. |
Date: |
Sun, 06 Mar 2016 17:49:46 +0000 |
Hi Ken,
> The scan listing for 'inc' is being generated as it's reading the
> spool file. So the ONLY way for you to get two scans is for you do
> actually incorporate the mail twice. The spool is locked, yes ... but
> I see from the code it's unlocked before it gets truncated
Is it? I didn't notice that in 1.6.
> (that seems like a bug to me, and that might be the cause of other
> problems).
>
> But ... because the folder was read at startup both times, it thought
> that the start of new messages was at the same point. So the second
> inc put the messages in the same files as the first inc.
Sounds plasible... I haven't delved deep enough, but wouldn't the creat
of [9704, 9712] have failed if the files already existed?
> Fixing this might be tough ... I don't know how locking behaves when
> you truncate a file
Well, the locks are advisory only, so I don't think the kernel's locking
code cares what happens to the file, e.g. writing to it, or truncating
it.
> (although I see that it uses creat() to truncate a file, rather than
> ftruncate(); that seems weird to me?).
And it's a bug it closes creat's FD, freeing the lock.
> I'd like to point out that it has never been safe to run two inc's at
> the same time, so it's not surprising that this caused problems.
Ouch! I've just skimmed inc(1) and see no sign of that restriction? I
think I'll make a ~/bin/inc that uses flock(1).
Cheers, Ralph.
- [Nmh-workers] Duplicate Scan Listings from Parallel inc(1)s., Ralph Corderoy, 2016/03/06
- [Nmh-workers] Truncated Email., Ralph Corderoy, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Ralph Corderoy, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Ken Hornstein, 2016/03/06
- Re: [Nmh-workers] Truncated Email.,
Ralph Corderoy <=
- Re: [Nmh-workers] Truncated Email., Ken Hornstein, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Ralph Corderoy, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Ken Hornstein, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Robert Elz, 2016/03/07
- Re: [Nmh-workers] Truncated Email., Lyndon Nerenberg, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Ralph Corderoy, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Lyndon Nerenberg, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Robert Elz, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Lyndon Nerenberg, 2016/03/06
- Re: [Nmh-workers] Truncated Email., Andy Bradford, 2016/03/06