pcap_findalldevs

[Hei Chan <structurechart () yahoo com>]

Hi,

I am new to libpcap, and I am trying to use the following to get the list of network devices available to libpcap by 
calling pcap_findalldevs().

Manpage mentions, "there may be network devices that cannot be  opened  by  the process  calling pcap_findalldevs(3), 
because, for example, that process does not have sufficient privileges to open them for capturing; if  so, those 
devices will not appear on the list".

What does "sufficient privileges" mean?  If I run the process as sudoer, it sounds like there shouldn't be any 
privilege issue.  What else will prevent pcap_findalldevs() from returning a network device on the list?

Thanks in advance.
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