On Jul 21, 2009, at 11:12 PM, Guy Harris wrote:
On Jun 23, 2009, at 7:34 PM, Mike Kershaw wrote:
(This now actually hits my error catcher where 100 fd highs in a row
with no packets triggers a shutdown of the source, since
libpcap-1.0.0
seems to not return errors in pcap_dispatch when a netdev is removed
There does not appear to be a way for the memory-mapped interface to
directly return such an error.
And not only that, but my test program reports, on my Fedora 9 system
(2.6.27.25-78.2.6.fc9.i686 kernel), that, if I unplug an interface on
which I'm capturing:
select() reports that the descriptor is readable;
there are *NO* packets to get from the memory-mapped buffer;
select() does *not* report that there's an exceptional condition on
the descriptor;
so the kernel and driver appear to be continuously reporting through
select() a condition *indistinguishable from "there's a packet
available"* even though no packets are available.
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