setting the initial ring size

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

hello,

In the current cvs, at least the bpf, the win32 and the linux (memory mapped) platforms use an internal buffer to 
perform the capture. The buffer size is currently user-configurable only for the win32 platform, and it would be nice 
to be able to do the same also on other platform, but the bpf don't allow to change the buffer size after the capture 
is started. 

A possible solution is to add a static variable to handle the buffer size and add a libpcap call to modify/set it's 
value which should be used as default by the various open method. The new function does not get a pcap handle as 
parameter, since it operates on a global variable; moreover calling it does not influence already opened captures. 
Since both bpf and linux shrink the said buffer if the creation fails due to insufficient memory available, it would be 
useful to add another pcap function to retrieve the capture buffer size for a given capture. 

If this idea sounds reasonable, I can post a patch to implement it.

ciao,

Paolo
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