Re: [AMaViS-user] mime_decode-1 FAILED: Error reading: Resource temporarily

Mark Martinec wrote:
> It seems the addition of I/O status checks unveiled some perlio problems
> on different platforms. Linux folks are seeing nonzero errno when reading
> line-by-line and the last line does not terminate by a NL (this works
> fine on FreeBSD). Sander Steffann (on a parallel thread) is reporting
> errors (Bad file descriptor) after successfully reading response from
> certain virus scanner daemons (on socket and on pipe, on Linux again).
>
> I'm running it all on FreeBSD 5.4 (or 5.2), Perl 5.8.6, and don't see
> such problems. I even repeated your experiment and watched the
> truss output, which doesn't report "Resource temporarily unavailable"
> on read from file(1) subprocess, and not even "Operation not supported
> by device".
>
> I would attribute it to different versions of Perl, but you used the
> same version of Perl. It appears unusual that the same Perl would
> behave that differently when run on FreeBSD 4.11 vs. 5.x, although
> it is possible.

<snip>

> I'm not sure what to suggest next, except for a temporary remedy
> of ignoring the $! after the loop. It may be worth experimenting
> with settings of the PERLIO env. variable (see perlrun man page).
>
> It seems to be Perl i/o problem (one or more) in all these cases,
> as it doesn't behave like the documentations claims it does.
> If someone has a will to report it to Perl bug tracking, with small
> self-contained test cases showing errno problems in a reproducible way,
> it would be very nice to the community.
>
> Mark

Thanks for investigating. I have been playing around with building Perl
on FreeBSD4.11. I can confirm that when using Perl compiled from the
ports collection, the error does not occur (I was building from src
tarball before).

When I get chance I'll see exactly how the ports version fixes this
problem. It's not just the patch-perl.c and patch-perlio.c patches.


Thanks,
Chris.



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