libpcap problems

[Bowser Jason S Contr AFRL/IFTA <Jason.Bowser () wpafb af mil>]

Hellow everyone 

I am having a problem with libpcap. I am using libpcap .8.3
I am writing some software that forks multiple process on a unix macine(IRIX) however when i have each child start the 
pcap_loop when i get to the 4th child and beyond i get the following error 

pcap_open_live snoop bind: Cant assign requested address 

However if i comment out the pcap_loop line the i dont get that error. 

I am opening the device (ef0) using promiscous mode if that helps 

Any help would be great. 

Thanks 
jason