Libpcap Open live() doubt

["jebu M Selwyn" <selwynjebu () rediffmail com>]

Hai experts,
I'm a linux newbee and I'm using libpcap for a project(Network 
Monitoring) and I have a doubt regarding the open live method..
In case there is no sender the open live method waits indefinitely 
and some times even it starts to capture packets even when there 
is no data sent..
What is the cause of this problem?
How can we check whether there is any source of packets
Thanx in advance.
Waiting for your reply
yours truly
M.Jebu Selwyn

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