Hi All, I am trying to understand code of tcpdump and libpcap static library. To have better understanding, I have added some fprintf statements in libpcap. But when I execute my tcpdump, I donot see an statements. I am not able to understand what is happening. Any idea.I tried to flush stream explicitly via invoking fflush but nothing happened. Regards Dinesh Send free SMS to your Friends on Mobile from your Yahoo! Messenger. Download Now! http://messenger.yahoo.com/download.php -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/