Re: Multi process sniffing and dropped packets

["Gianluca Varenni" <gianluca.varenni () cacetech com>]

----- Original Message ----- 
From: "Guy Harris" <guy () alum mit edu>
To: <tcpdump-workers () lists tcpdump org>
Sent: Thursday, January 12, 2006 5:17 PM
Subject: Re: [tcpdump-workers] Multi process sniffing and dropped packets


> On Jan 12, 2006, at 3:29 PM, Gianluca Varenni wrote:
>
> > > BUT..is pcap library able to manage safety multi
> > > process (or maybe multi thread) calls with the same
> > > pcap_t handle in each process ?
> >
> > No. The pcap_t handle is not guaranteed to be thread-safe.  Specifically, 
> > every packet returned by pcap_next (or pcap_next_ex)  is valid until the 
> > next call to pcap_next_ex, pcap_close  (or  pcap_loop/dispatch).
>
> He's talking about multiple processes, not multiple threads, so each 
> process would have its own pcap_t handle.

That's why I said "thread-safe". He was asking "multi process (or maybe 
multi thread)".

Maybe I was not clear enough.

GV


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