Re: error writing to filter (bogofilter)

Christian Ebert writes:

> * Sam Varshavchik on Thursday, June 20, 2013 at 07:01:45 -0400
> > Matthias Andree writes:
> >> we appear to see that maildrop-on-new-MacOS does not get all data
> >> through xfilter.  David Relson traced in- and outputs of bogofilter, and
> >> it looks as though the stdin that bogofilter is getting is truncated at
> >> exactly 40 kBytes.  Hints as to the problem below.
> >>
> >> Is there a way to log more details when writing to the xfilter
> >> socketpair or pipe (whatever it's using, I haven't read your code),
> >> especially like name, decoded errno, and thereabouts?
> >> (I hope I see more in dtruss output.)
> >
> > Nope, the loop that writes the message to the pipe does not do any
> > logging of its own. If write() returns an error, and it's not EINTR,
> > then you get "maildrop: error writing to filter." It's fairly simple.
>
> My layman's summary:
>
> 1) Not related to bogofilter, can be replicated with this minimal
> config:
>
> xfilter "/bin/cat"
> to "$DEFAULT"
>
> 2) Happens with any kind of message > 40kb
>
> I suspect an issue regarding temp files and/or with clang and/or
> header files, but have C or C++ experience whatsoever.

I'm inclined to agree, except that it's probably has to do with the behavior  
of the select(3) system call.

You need a Mac-OS-based developer here to investigate what's going on,  
there. This should be trivially fixable, just need someone on Mac-OS to roll  
their sleeves up, and start digging.

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