[PATCH] enable memory mapped access to ethernet device for linux

["Paolo Abeni" <paolo.abeni () telecomitalia it>]

hi list,

Following the discussion about the memory mapped access for Linux, I
tried to rework some existing code (originally independently created by
Simon Patarin and Phil Wood) to enable this functionality with the
minimum impact on the current pcap code. 

It does not use environment variables to control the memory mapped ring
parameters; instead the requested snap len is used: the low order bytes
are used to select the ring frame size and the high order bytes are used
to select the ring frame number. If the high order bytes is 0, like in
every current libpcap usage, a reasonable default is used. 

The poll function is used to implement the timeout in the read method:
must I add some autoconf check for poll() availability ?!? or use
select() instead ?!?

I really appreciated any comments and or review on this matter (even a
'please don't try to push this thing ...' :-)

Thanks,

Paolo
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