Re: dma(8): Fix race condition in multi-recipient delivery

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

This is a multi-part message in MIME format.
Daniel Roethlisberger wrote:
> When delivering mail to multiple recipients, dma(8) will fork for
> each recipient and attempt parallel delivery.  Separate delivery
> processes for multiple recipients of the same message all use the
> same FILE* on the same file descriptor.  If a process is loosing
> the CPU during the delivery process, another delivery process for
> the same message will wreak havoc on the file descriptor.  The
> symptom is dma(8) logging a failed delivery and bouncing the
> message for some or all of the recipients:
>
> Jul  3 20:57:21 marvin dma[32640]: 15c.284010d0: remote delivery
> failed:corrupted queue file

Thanks for your submission!  I've taken a different approach, could you please test whether it works for you?  (Untested patch).

thanks,
 simon