> On Mon, 4 Jun 2001, Guy Harris wrote:
> For me, timeouts work quite perfect, using select().
> "Even" :) on BSD. You just need to set BIOCIMMEDIATE
> ioctl on the bpf device.
BIOCIMMEDIATE causes the timeout not to do anything, so that you don't
get any "batching" of packets:
BIOCIMMEDIATE (u_int) Enable or disable ``immediate mode'', based on the
truth value of the argument. When immediate mode is en-
abled, reads return immediately upon packet reception.
Otherwise, a read will block until either the kernel
buffer becomes full or a timeout occurs. This is useful
for programs like rarpd(8) which must respond to messages
in real time. The default for a new file is off.
> I added this by myself on a higher-level, since pcap seems
> to miss it in the BSD code.
The lack of batching is *why* libpcap doesn't turn it on - the reason
for batching packets is to reduce the number of reads done by increasing
the number of packets you get per read.
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