[tcpdump-workers] libpcap and select problem

[Ying Li]

Hi,

I'm trying to write a program that simulates a RDP
(RUDP) protocol with a timeout on the host.  Right now
i have it as

-pcap_setnonblock(...)
-reset timevar
-retval = select(, timevar); or pselect(...)
-if(retval)
pcap_dispatch(...) or pcap_next_ex(...)
-else
timeout++

I've tried pselect,select, pcap_next_ex,
pcap_dispatch, nonblock, block.  But none of them seem
to work right.  Sometimes select() times out way too
fast, like 0.0001 seconds while my timevar is set to
0.001 sec.  I'ved tried making it always timeout and
used gettimeofday() to check the time it waited, and
it would be a variable(with big differences).  Can
anyone point me in the right direction?  Thanks!!

-Ying Li



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Re: [tcpdump-workers] libpcap and select problem

[Guy Harris]

On Oct 25, 2004, at 1:27 PM, Ying Li wrote:
Sometimes select() times out way too
fast, like 0.0001 seconds while my timevar is set to
0.001 sec.
Times out in the sense that retval is 0?
On what OS are you doing this?
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