Re: Exception conditions on pcap descriptors?

[Sam Roberts <vieuxtech () gmail com>]

On Thu, Dec 29, 2011 at 3:45 PM, Fernando Gont <fernando () gont com ar> wrote:
> I'm doing I/O multiplexing by obtaining the underlying file descriptor
> for the pcap_t "socket", with pcap_fileno().
>
> I was wondering whether I should check for exceptions on such descriptor
> (in addition to readability and writeability), and whether such
> exceptions could possibly occur (and if so, what the possible causes of
> such exceptions could be).

Socket exception checked with select aren't exceptions in the sense of
error, they are what is more commonly
called out-of-band data. Its a perpetual source of confusion. You
should only have to check for readability, if there is an error
pending on the socket it will be readable, and read/recv will return
the error.

Cheers,
Sam
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